use anyhow::{anyhow, bail, Context, Result};
use base64::{engine::general_purpose, Engine};
use chrono::{DateTime, NaiveDateTime, Utc};
use lightops_common::protocol::{DockerContainer, DockerImage, FileEntry, NginxSite, ServiceInfo};
use serde_json::{json, Value};
use std::{
    fs,
    io::{Read, Seek, SeekFrom, Write},
    path::{Path, PathBuf},
};
use tokio::process::Command;
use tokio::time::{timeout, Duration};

const MAX_TEXT_FILE: u64 = 2 * 1024 * 1024;
const NGINX_AVAILABLE: &str = "/etc/nginx/sites-available";
const NGINX_ENABLED: &str = "/etc/nginx/sites-enabled";

pub async fn handle(action: &str, params: Value) -> Result<Value> {
    if action.starts_with("app.") {
        return crate::app::handle(action, params).await;
    }
    match action {
        "system.snapshot" => system_snapshot().await,
        "file.roots" => file_roots(),
        "file.list" => file_list(path_param(&params, "path")?),
        "file.search" => file_search(params),
        "file.read" => file_read(path_param(&params, "path")?),
        "file.write" => file_write(
            path_param(&params, "path")?,
            string_param(&params, "content")?,
        ),
        "file.mkdir" => file_mkdir(path_param(&params, "path")?),
        "file.delete" => file_delete(
            path_param(&params, "path")?,
            params
                .get("recursive")
                .and_then(Value::as_bool)
                .unwrap_or(false),
        ),
        "file.rename" => file_rename(path_param(&params, "from")?, path_param(&params, "to")?),
        "file.upload.chunk" => file_upload_chunk(params),
        "file.download.chunk" => file_download_chunk(params),
        "file.chmod" => file_chmod(params),
        "log.tail_file" | "log.read_file" => log_tail(params).await,
        "service.list" => service_list().await,
        "service.status" => service_status(string_param(&params, "name")?).await,
        "service.start" => service_action("start", string_param(&params, "name")?).await,
        "service.stop" => service_action("stop", string_param(&params, "name")?).await,
        "service.restart" => service_action("restart", string_param(&params, "name")?).await,
        "service.enable" => service_action("enable", string_param(&params, "name")?).await,
        "service.disable" => service_action("disable", string_param(&params, "name")?).await,
        "nginx.status" => nginx_status().await,
        "nginx.sites" => nginx_sites(),
        "nginx.site.get" => nginx_site_get(string_param(&params, "name")?),
        "nginx.site.backups" => nginx_site_backups(string_param(&params, "name")?),
        "nginx.site.restore_backup" => {
            nginx_site_restore_backup(
                string_param(&params, "name")?,
                string_param(&params, "backup")?,
            )
            .await
        }
        "nginx.site.create" => nginx_site_create(params).await,
        "nginx.site.update" => {
            nginx_site_update(
                string_param(&params, "name")?,
                string_param(&params, "content")?,
            )
            .await
        }
        "nginx.site.enable" => nginx_site_enable(string_param(&params, "name")?).await,
        "nginx.site.disable" => nginx_site_disable(string_param(&params, "name")?),
        "nginx.test" => nginx_test().await,
        "nginx.reload" => nginx_reload().await,
        "nginx.ssl.status" => nginx_ssl_status().await,
        "nginx.ssl.issue" => nginx_ssl_issue(params).await,
        "nginx.ssl.renew" => nginx_ssl_renew().await,
        "nginx.ssl.auto_renew" => nginx_ssl_auto_renew().await,
        "docker.status" => docker_status().await,
        "docker.containers" => docker_containers().await,
        "docker.container.inspect" => docker_inspect(string_param(&params, "id")?).await,
        "docker.container.stats" => docker_stats(string_param(&params, "id")?).await,
        "docker.container.run" => docker_run(params).await,
        "docker.container.start" => docker_simple("start", string_param(&params, "id")?).await,
        "docker.container.stop" => docker_simple("stop", string_param(&params, "id")?).await,
        "docker.container.restart" => docker_simple("restart", string_param(&params, "id")?).await,
        "docker.container.delete" => docker_simple("rm", string_param(&params, "id")?).await,
        "docker.container.logs" => {
            docker_logs(
                string_param(&params, "id")?,
                params.get("tail").and_then(Value::as_u64).unwrap_or(200),
            )
            .await
        }
        "docker.images" => docker_images().await,
        "docker.image.pull" => docker_pull(string_param(&params, "image")?).await,
        "docker.image.delete" => docker_rmi(string_param(&params, "id")?).await,
        "docker.volumes" => docker_volumes().await,
        "docker.volume.delete" => docker_volume_delete(string_param(&params, "name")?).await,
        "docker.compose.projects" => docker_compose_projects().await,
        "docker.compose.start" => {
            docker_compose_action("start", string_param(&params, "project")?).await
        }
        "docker.compose.stop" => {
            docker_compose_action("stop", string_param(&params, "project")?).await
        }
        "docker.compose.restart" => {
            docker_compose_action("restart", string_param(&params, "project")?).await
        }
        "docker.compose.logs" => {
            docker_compose_logs(
                string_param(&params, "project")?,
                params.get("tail").and_then(Value::as_u64).unwrap_or(200),
            )
            .await
        }
        "docker.compose.preflight" => docker_compose_preflight(params).await,
        "docker.compose.deploy" => docker_compose_deploy(params).await,
        "docker.compose.update" => docker_compose_update(params).await,
        "docker.compose.down" => docker_compose_down(params).await,
        _ => bail!("不支持的操作"),
    }
}

#[allow(dead_code)]
pub trait DockerProvider {
    async fn list_containers(&self) -> Result<Vec<DockerContainer>>;
    async fn start_container(&self, id: &str) -> Result<()>;
    async fn stop_container(&self, id: &str) -> Result<()>;
    async fn restart_container(&self, id: &str) -> Result<()>;
    async fn remove_container(&self, id: &str) -> Result<()>;
}

#[allow(dead_code)]
pub struct DockerCliProvider;

impl DockerProvider for DockerCliProvider {
    async fn list_containers(&self) -> Result<Vec<DockerContainer>> {
        let value = docker_containers().await?;
        Ok(serde_json::from_value(value["containers"].clone())?)
    }

    async fn start_container(&self, id: &str) -> Result<()> {
        docker_simple("start", id.to_string()).await.map(|_| ())
    }

    async fn stop_container(&self, id: &str) -> Result<()> {
        docker_simple("stop", id.to_string()).await.map(|_| ())
    }

    async fn restart_container(&self, id: &str) -> Result<()> {
        docker_simple("restart", id.to_string()).await.map(|_| ())
    }

    async fn remove_container(&self, id: &str) -> Result<()> {
        docker_simple("rm", id.to_string()).await.map(|_| ())
    }
}

async fn system_snapshot() -> Result<Value> {
    let processes = command_json_lines(
        Command::new("ps").args(["-eo", "pid,ppid,user,comm,%cpu,%mem", "--sort=-%cpu"]),
        8,
        parse_process_line,
        30,
    )
    .await
    .unwrap_or_default();
    let ports_result = match command_lines(Command::new("ss").args(["-H", "-tulpen"]), 8).await {
        Ok(lines) => Ok(lines),
        Err(_) => command_lines(Command::new("netstat").args(["-tulpen"]), 8).await,
    };
    let ports = ports_result
        .unwrap_or_default()
        .into_iter()
        .take(80)
        .map(|line| json!({ "raw": line }))
        .collect::<Vec<_>>();
    let disks = command_json_lines(Command::new("df").args(["-hP"]), 8, parse_disk_line, 50)
        .await
        .unwrap_or_default();
    let networks = command_lines(Command::new("ip").args(["-brief", "addr"]), 8)
        .await
        .unwrap_or_default()
        .into_iter()
        .map(|line| json!({ "raw": line }))
        .collect::<Vec<_>>();
    Ok(json!({
        "processes": processes,
        "ports": ports,
        "disks": disks,
        "networks": networks
    }))
}

async fn command_lines(cmd: &mut Command, timeout_secs: u64) -> Result<Vec<String>> {
    let output = run_command(cmd, timeout_secs).await?;
    let text = output_text(output)?;
    Ok(text
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty())
        .map(ToString::to_string)
        .collect())
}

async fn command_json_lines<F>(
    cmd: &mut Command,
    timeout_secs: u64,
    parser: F,
    limit: usize,
) -> Result<Vec<Value>>
where
    F: Fn(&str) -> Option<Value>,
{
    Ok(command_lines(cmd, timeout_secs)
        .await?
        .into_iter()
        .skip(1)
        .filter_map(|line| parser(&line))
        .take(limit)
        .collect())
}

fn parse_process_line(line: &str) -> Option<Value> {
    let parts = line.split_whitespace().collect::<Vec<_>>();
    if parts.len() < 6 {
        return None;
    }
    Some(json!({
        "pid": parts[0],
        "ppid": parts[1],
        "user": parts[2],
        "name": parts[3],
        "cpu": parts[4],
        "memory": parts[5]
    }))
}

fn parse_disk_line(line: &str) -> Option<Value> {
    let parts = line.split_whitespace().collect::<Vec<_>>();
    if parts.len() < 6 {
        return None;
    }
    Some(json!({
        "filesystem": parts[0],
        "size": parts[1],
        "used": parts[2],
        "available": parts[3],
        "usage": parts[4],
        "mount": parts[5]
    }))
}

fn string_param(params: &Value, name: &str) -> Result<String> {
    params
        .get(name)
        .and_then(Value::as_str)
        .map(ToString::to_string)
        .ok_or_else(|| anyhow!("缺少参数：{name}"))
}

fn path_param(params: &Value, name: &str) -> Result<PathBuf> {
    let value = string_param(params, name)?;
    if value.contains('\0') {
        bail!("路径无效");
    }
    Ok(PathBuf::from(value))
}

fn file_roots() -> Result<Value> {
    let mut roots = Vec::new();
    #[cfg(windows)]
    {
        for letter in b'A'..=b'Z' {
            let path = format!("{}:\\", letter as char);
            if Path::new(&path).exists() {
                roots.push(json!({ "name": path, "path": path }));
            }
        }
    }
    #[cfg(not(windows))]
    {
        roots.push(json!({ "name": "/", "path": "/" }));
    }
    Ok(json!({ "roots": roots }))
}

fn file_list(path: PathBuf) -> Result<Value> {
    let entries = fs::read_dir(&path)
        .with_context(|| format!("read directory {}", path.display()))?
        .filter_map(|entry| {
            let entry = entry.ok()?;
            let meta = entry.metadata().ok()?;
            Some(FileEntry {
                name: entry.file_name().to_string_lossy().to_string(),
                path: entry.path().to_string_lossy().to_string(),
                is_dir: meta.is_dir(),
                size: meta.len(),
                modified: meta.modified().ok().and_then(|t| {
                    t.duration_since(std::time::UNIX_EPOCH)
                        .ok()
                        .map(|d| d.as_secs().to_string())
                }),
                readonly: meta.permissions().readonly(),
            })
        })
        .collect::<Vec<_>>();
    Ok(json!({ "path": path, "entries": entries }))
}

fn file_search(params: Value) -> Result<Value> {
    let root = path_param(&params, "path")?;
    let keyword = string_param(&params, "keyword")?;
    let keyword = keyword.trim().to_lowercase();
    if keyword.is_empty()
        || keyword.len() > 120
        || keyword.contains('\0')
        || keyword.contains('/')
        || keyword.contains('\\')
    {
        bail!("搜索关键词无效");
    }
    let max_depth = params
        .get("max_depth")
        .and_then(Value::as_u64)
        .unwrap_or(5)
        .min(10) as usize;
    let limit = params
        .get("limit")
        .and_then(Value::as_u64)
        .unwrap_or(100)
        .min(500) as usize;
    let mut results = Vec::new();
    search_dir(&root, &keyword, 0, max_depth, limit, &mut results)?;
    Ok(json!({ "path": root, "keyword": keyword, "entries": results }))
}

fn search_dir(
    path: &Path,
    keyword: &str,
    depth: usize,
    max_depth: usize,
    limit: usize,
    results: &mut Vec<Value>,
) -> Result<()> {
    if depth > max_depth || results.len() >= limit {
        return Ok(());
    }
    let Ok(entries) = fs::read_dir(path) else {
        return Ok(());
    };
    for entry in entries.flatten() {
        if results.len() >= limit {
            break;
        }
        let name = entry.file_name().to_string_lossy().to_string();
        let entry_path = entry.path();
        let meta = entry.metadata().ok();
        let is_dir = meta.as_ref().is_some_and(|value| value.is_dir());
        if name.to_lowercase().contains(keyword) {
            results.push(json!({
                "name": name,
                "path": entry_path,
                "is_dir": is_dir,
                "size": meta.as_ref().map(|value| value.len()).unwrap_or(0)
            }));
        }
        if is_dir {
            let _ = search_dir(&entry_path, keyword, depth + 1, max_depth, limit, results);
        }
    }
    Ok(())
}

fn file_read(path: PathBuf) -> Result<Value> {
    let meta = fs::metadata(&path)?;
    if meta.len() > MAX_TEXT_FILE {
        bail!("文件过大，无法按文本读取");
    }
    Ok(json!({ "path": path, "content": fs::read_to_string(path)? }))
}

fn file_write(path: PathBuf, content: String) -> Result<Value> {
    if content.len() as u64 > MAX_TEXT_FILE {
        bail!("写入内容过大");
    }
    fs::write(&path, content)?;
    Ok(json!({ "ok": true, "path": path }))
}

fn file_mkdir(path: PathBuf) -> Result<Value> {
    fs::create_dir_all(&path)?;
    Ok(json!({ "ok": true, "path": path }))
}

fn file_delete(path: PathBuf, recursive: bool) -> Result<Value> {
    let meta = fs::metadata(&path)?;
    if meta.is_dir() {
        if recursive {
            fs::remove_dir_all(&path)?;
        } else {
            fs::remove_dir(&path)?;
        }
    } else {
        fs::remove_file(&path)?;
    }
    Ok(json!({ "ok": true }))
}

fn file_rename(from: PathBuf, to: PathBuf) -> Result<Value> {
    fs::rename(&from, &to)?;
    Ok(json!({ "ok": true }))
}

fn file_upload_chunk(params: Value) -> Result<Value> {
    let path = path_param(&params, "path")?;
    let offset = params.get("offset").and_then(Value::as_u64).unwrap_or(0);
    let data = string_param(&params, "data")?;
    let bytes = general_purpose::STANDARD
        .decode(data)
        .context("分片数据不是有效 base64")?;
    if bytes.len() > 1024 * 1024 {
        bail!("单个分片不能超过 1MB");
    }
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent)?;
    }
    let mut file = fs::OpenOptions::new()
        .create(true)
        .write(true)
        .truncate(offset == 0)
        .open(&path)?;
    file.seek(SeekFrom::Start(offset))?;
    file.write_all(&bytes)?;
    Ok(json!({ "ok": true, "path": path, "written": bytes.len(), "offset": offset }))
}

fn file_download_chunk(params: Value) -> Result<Value> {
    let path = path_param(&params, "path")?;
    let offset = params.get("offset").and_then(Value::as_u64).unwrap_or(0);
    let size = params
        .get("size")
        .and_then(Value::as_u64)
        .unwrap_or(512 * 1024)
        .min(1024 * 1024) as usize;
    let meta = fs::metadata(&path)?;
    if !meta.is_file() {
        bail!("只能下载普通文件");
    }
    let mut file = fs::File::open(&path)?;
    file.seek(SeekFrom::Start(offset))?;
    let mut buf = vec![0u8; size];
    let read = file.read(&mut buf)?;
    buf.truncate(read);
    Ok(json!({
        "path": path,
        "offset": offset,
        "size": meta.len(),
        "read": read,
        "eof": offset + read as u64 >= meta.len(),
        "data": general_purpose::STANDARD.encode(buf)
    }))
}

fn file_chmod(params: Value) -> Result<Value> {
    let path = path_param(&params, "path")?;
    let mode = string_param(&params, "mode")?;
    if mode.len() > 4 || !mode.chars().all(|c| matches!(c, '0'..='7')) {
        bail!("权限模式无效，例如 755");
    }
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        let value = u32::from_str_radix(&mode, 8)?;
        let mut permissions = fs::metadata(&path)?.permissions();
        permissions.set_mode(value);
        fs::set_permissions(&path, permissions)?;
        Ok(json!({ "ok": true, "path": path, "mode": mode }))
    }
    #[cfg(not(unix))]
    {
        let _ = path;
        bail!("当前系统不支持 chmod")
    }
}

async fn log_tail(params: Value) -> Result<Value> {
    let path = path_param(&params, "path")?;
    let lines = params
        .get("lines")
        .and_then(Value::as_u64)
        .unwrap_or(200)
        .min(2000);
    let output = run_command(
        Command::new("tail")
            .arg("-n")
            .arg(lines.to_string())
            .arg(path),
        8,
    )
    .await?;
    command_value(output)
}

async fn service_list() -> Result<Value> {
    let output = run_command(
        Command::new("systemctl").args([
            "list-units",
            "--type=service",
            "--all",
            "--no-pager",
            "--plain",
        ]),
        10,
    )
    .await?;
    let text = output_text(output)?;
    let services = text
        .lines()
        .filter(|line| line.ends_with(".service") || line.contains(".service "))
        .filter_map(parse_service_line)
        .collect::<Vec<_>>();
    Ok(json!({ "services": services }))
}

fn parse_service_line(line: &str) -> Option<ServiceInfo> {
    let parts = line.split_whitespace().collect::<Vec<_>>();
    if parts.len() < 4 || !parts[0].contains(".service") {
        return None;
    }
    Some(ServiceInfo {
        name: parts[0].to_string(),
        load: parts.get(1).unwrap_or(&"").to_string(),
        active: parts.get(2).unwrap_or(&"").to_string(),
        sub: parts.get(3).unwrap_or(&"").to_string(),
        description: parts.get(4..).unwrap_or(&[]).join(" "),
        enabled: None,
    })
}

async fn service_status(name: String) -> Result<Value> {
    validate_unit(&name)?;
    command_value(
        run_command(
            Command::new("systemctl").args(["status", "--no-pager", &name]),
            10,
        )
        .await?,
    )
}

async fn service_action(action: &str, name: String) -> Result<Value> {
    validate_unit(&name)?;
    command_value(run_command(Command::new("systemctl").args([action, &name]), 30).await?)
}

fn validate_unit(name: &str) -> Result<()> {
    if name.len() > 200
        || !name
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || ".@_-".contains(c))
    {
        bail!("服务名称无效");
    }
    Ok(())
}

async fn nginx_status() -> Result<Value> {
    let output = run_command(Command::new("nginx").arg("-v"), 8).await;
    match output {
        Ok(output) => {
            Ok(json!({ "installed": output.status.success(), "version": stderr_text(&output) }))
        }
        Err(_) => Ok(json!({ "installed": false, "version": null })),
    }
}

fn nginx_sites() -> Result<Value> {
    let enabled = fs::read_dir(NGINX_ENABLED)
        .map(|it| {
            it.filter_map(|e| e.ok().map(|e| e.file_name().to_string_lossy().to_string()))
                .collect::<Vec<_>>()
        })
        .unwrap_or_default();
    let sites = fs::read_dir(NGINX_AVAILABLE)?
        .filter_map(|entry| {
            let entry = entry.ok()?;
            let name = entry.file_name().to_string_lossy().to_string();
            Some(NginxSite {
                enabled: enabled.contains(&name),
                path: entry.path().to_string_lossy().to_string(),
                name,
            })
        })
        .collect::<Vec<_>>();
    Ok(json!({ "sites": sites }))
}

fn nginx_site_get(name: String) -> Result<Value> {
    validate_site_name(&name)?;
    let path = Path::new(NGINX_AVAILABLE).join(&name);
    Ok(json!({ "name": name, "content": fs::read_to_string(path)? }))
}

async fn nginx_site_create(params: Value) -> Result<Value> {
    let name = string_param(&params, "name")?;
    validate_site_name(&name)?;
    let server_name = params
        .get("server_name")
        .and_then(Value::as_str)
        .unwrap_or(&name);
    let mode = params
        .get("mode")
        .and_then(Value::as_str)
        .unwrap_or("static");
    let content = match mode {
        "proxy" => {
            let upstream = params
                .get("upstream")
                .and_then(Value::as_str)
                .unwrap_or("http://127.0.0.1:3000");
            nginx_proxy_config(server_name, upstream, &params)
        }
        "spa" => {
            let root = params
                .get("root")
                .and_then(Value::as_str)
                .unwrap_or("/var/www/html");
            nginx_spa_config(server_name, root)
        }
        "load_balance" => nginx_load_balance_config(server_name, &params)?,
        "php" => {
            let root = params
                .get("root")
                .and_then(Value::as_str)
                .unwrap_or("/var/www/html");
            let fastcgi_pass = params
                .get("fastcgi_pass")
                .and_then(Value::as_str)
                .unwrap_or("unix:/run/php/php8.2-fpm.sock");
            nginx_php_config(server_name, root, fastcgi_pass)
        }
        _ => {
            let root = params
                .get("root")
                .and_then(Value::as_str)
                .unwrap_or("/var/www/html");
            nginx_static_config(server_name, root)
        }
    };
    nginx_site_update(name.clone(), content).await?;
    Ok(json!({ "ok": true, "name": name }))
}

fn nginx_site_backups(name: String) -> Result<Value> {
    validate_site_name(&name)?;
    let prefix = format!("{name}.bak.");
    let backups = fs::read_dir(NGINX_AVAILABLE)
        .map(|entries| {
            entries
                .filter_map(|entry| {
                    let entry = entry.ok()?;
                    let file_name = entry.file_name().to_string_lossy().to_string();
                    if !file_name.starts_with(&prefix) {
                        return None;
                    }
                    let meta = entry.metadata().ok()?;
                    Some(json!({
                        "name": file_name,
                        "path": entry.path().to_string_lossy().to_string(),
                        "size": meta.len(),
                        "modified": meta.modified().ok().and_then(|time| time.duration_since(std::time::UNIX_EPOCH).ok()).map(|duration| duration.as_secs().to_string())
                    }))
                })
                .collect::<Vec<_>>()
        })
        .unwrap_or_default();
    Ok(json!({ "name": name, "backups": backups }))
}

async fn nginx_site_restore_backup(name: String, backup: String) -> Result<Value> {
    validate_site_name(&name)?;
    validate_site_name(&backup)?;
    if !backup.starts_with(&format!("{name}.bak.")) {
        bail!("备份文件不属于该站点");
    }
    let backup_path = Path::new(NGINX_AVAILABLE).join(&backup);
    if !backup_path.exists() {
        bail!("备份文件不存在");
    }
    let target = Path::new(NGINX_AVAILABLE).join(&name);
    if target.exists() {
        let rollback = target.with_extension(format!("bak.{}", chrono_like_timestamp()));
        fs::copy(&target, rollback)?;
    }
    fs::copy(&backup_path, &target)?;
    match nginx_test().await {
        Ok(_) => Ok(json!({ "ok": true, "name": name, "backup": backup })),
        Err(err) => bail!("恢复后 Nginx 配置测试失败：{err}"),
    }
}

async fn nginx_site_update(name: String, content: String) -> Result<Value> {
    validate_site_name(&name)?;
    let path = Path::new(NGINX_AVAILABLE).join(&name);
    let mut backup_path = None;
    if path.exists() {
        let backup = path.with_extension(format!("bak.{}", chrono_like_timestamp()));
        fs::copy(&path, &backup)?;
        backup_path = Some(backup);
    }
    fs::write(&path, content)?;
    match nginx_test().await {
        Ok(_) => Ok(json!({ "ok": true })),
        Err(err) => {
            if let Some(backup) = backup_path {
                let _ = fs::copy(backup, &path);
            } else {
                let _ = fs::remove_file(&path);
            }
            bail!("Nginx 配置测试失败，已尝试回滚：{err}")
        }
    }
}

async fn nginx_site_enable(name: String) -> Result<Value> {
    validate_site_name(&name)?;
    let src = Path::new(NGINX_AVAILABLE).join(&name);
    let dst = Path::new(NGINX_ENABLED).join(&name);
    if !dst.exists() {
        #[cfg(unix)]
        std::os::unix::fs::symlink(&src, &dst)?;
        #[cfg(windows)]
        fs::copy(&src, &dst)?;
    }
    nginx_test().await?;
    Ok(json!({ "ok": true }))
}

fn nginx_site_disable(name: String) -> Result<Value> {
    validate_site_name(&name)?;
    let dst = Path::new(NGINX_ENABLED).join(&name);
    if dst.exists() {
        fs::remove_file(dst)?;
    }
    Ok(json!({ "ok": true }))
}

async fn nginx_test() -> Result<Value> {
    command_value(run_command(Command::new("nginx").arg("-t"), 15).await?)
}

async fn nginx_reload() -> Result<Value> {
    nginx_test().await?;
    command_value(run_command(Command::new("systemctl").args(["reload", "nginx"]), 20).await?)
}

async fn nginx_ssl_status() -> Result<Value> {
    let certbot = run_command(Command::new("certbot").arg("--version"), 8).await;
    let installed = certbot
        .as_ref()
        .map(|output| output.status.success())
        .unwrap_or(false);
    let version = certbot
        .as_ref()
        .map(|output| {
            let stderr = stderr_text(output);
            if stderr.trim().is_empty() {
                stdout_text(output)
            } else {
                stderr
            }
        })
        .unwrap_or_default();
    let certbot_timer = run_command(
        Command::new("systemctl").args(["is-enabled", "certbot.timer"]),
        8,
    )
    .await;
    let lightops_timer = run_command(
        Command::new("systemctl").args(["is-enabled", "lightops-certbot-renew.timer"]),
        8,
    )
    .await;
    let auto_renew_enabled = certbot_timer
        .as_ref()
        .map(|output| output.status.success())
        .unwrap_or(false)
        || lightops_timer
            .as_ref()
            .map(|output| output.status.success())
            .unwrap_or(false);
    let auto_renew_provider = if certbot_timer
        .as_ref()
        .map(|output| output.status.success())
        .unwrap_or(false)
    {
        "certbot.timer"
    } else if lightops_timer
        .as_ref()
        .map(|output| output.status.success())
        .unwrap_or(false)
    {
        "lightops-certbot-renew.timer"
    } else {
        "none"
    };
    let certs = list_letsencrypt_certs().await;
    Ok(json!({
        "installed": installed,
        "version": version.trim(),
        "auto_renew_enabled": auto_renew_enabled,
        "auto_renew_provider": auto_renew_provider,
        "certs": certs
    }))
}

async fn nginx_ssl_issue(params: Value) -> Result<Value> {
    ensure_certbot_installed().await?;
    let domains = params
        .get("domains")
        .and_then(Value::as_array)
        .ok_or_else(|| anyhow!("缺少域名列表"))?
        .iter()
        .filter_map(Value::as_str)
        .map(str::trim)
        .filter(|domain| !domain.is_empty())
        .map(ToString::to_string)
        .collect::<Vec<_>>();
    if domains.is_empty() {
        bail!("至少需要一个域名");
    }
    for domain in &domains {
        validate_domain(domain)?;
    }
    let email = params.get("email").and_then(Value::as_str).map(str::trim);
    if let Some(email) = email {
        validate_email(email)?;
    }
    let mut command = Command::new("certbot");
    command
        .args(["--nginx", "--non-interactive", "--agree-tos", "--redirect"])
        .arg("--keep-until-expiring");
    if let Some(email) = email.filter(|value| !value.is_empty()) {
        command.args(["-m", email]);
    } else {
        command.arg("--register-unsafely-without-email");
    }
    for domain in &domains {
        command.args(["-d", domain]);
    }
    let result = command_value(run_command(&mut command, 120).await?)?;
    let _ = nginx_reload().await;
    Ok(result)
}

async fn nginx_ssl_renew() -> Result<Value> {
    ensure_certbot_installed().await?;
    let result = command_value(run_command(Command::new("certbot").arg("renew"), 120).await?)?;
    let _ = nginx_reload().await;
    Ok(result)
}

async fn nginx_ssl_auto_renew() -> Result<Value> {
    ensure_certbot_installed().await?;
    let systemctl = run_command(
        Command::new("systemctl").args(["enable", "--now", "certbot.timer"]),
        20,
    )
    .await;
    match systemctl {
        Ok(output) if output.status.success() => command_value(output),
        _ => {
            install_lightops_certbot_timer()?;
            command_value(run_command(Command::new("systemctl").arg("daemon-reload"), 20).await?)?;
            command_value(
                run_command(
                    Command::new("systemctl").args([
                        "enable",
                        "--now",
                        "lightops-certbot-renew.timer",
                    ]),
                    20,
                )
                .await?,
            )
        }
    }
}

async fn ensure_certbot_installed() -> Result<()> {
    let output = run_command(Command::new("certbot").arg("--version"), 8).await;
    match output {
        Ok(output) if output.status.success() => Ok(()),
        _ => bail!("未检测到 certbot，请先在 Agent 主机安装 certbot 和 Nginx 插件"),
    }
}

fn install_lightops_certbot_timer() -> Result<()> {
    let service = r#"[Unit]
Description=LightOps Certbot 自动续期
Wants=network-online.target
After=network-online.target

[Service]
Type=oneshot
ExecStart=/usr/bin/env certbot renew --quiet --deploy-hook "systemctl reload nginx"
"#;
    let timer = r#"[Unit]
Description=LightOps 每日检查 Certbot 证书续期

[Timer]
OnCalendar=*-*-* 03:35:00
RandomizedDelaySec=1800
Persistent=true

[Install]
WantedBy=timers.target
"#;
    fs::write(
        "/etc/systemd/system/lightops-certbot-renew.service",
        service,
    )?;
    fs::write("/etc/systemd/system/lightops-certbot-renew.timer", timer)?;
    Ok(())
}

async fn list_letsencrypt_certs() -> Vec<Value> {
    let root = Path::new("/etc/letsencrypt/live");
    let Ok(entries) = fs::read_dir(root) else {
        return Vec::new();
    };
    let mut certs = Vec::new();
    for entry in entries {
        if let Some(cert) = async {
            let entry = entry.ok()?;
            let name = entry.file_name().to_string_lossy().to_string();
            if name.starts_with('.') {
                return None;
            }
            let fullchain = entry.path().join("fullchain.pem");
            let (expires_at, days_remaining, status) = cert_expiry(&fullchain).await;
            Some(json!({
                "name": name,
                "path": entry.path().to_string_lossy().to_string(),
                "fullchain": fullchain.to_string_lossy().to_string(),
                "privkey": entry.path().join("privkey.pem").to_string_lossy().to_string(),
                "expires_at": expires_at,
                "days_remaining": days_remaining,
                "status": status
            }))
        }
        .await
        {
            certs.push(cert);
        }
    }
    certs
}

async fn cert_expiry(path: &Path) -> (Option<String>, Option<i64>, String) {
    let output = run_command(
        Command::new("openssl")
            .args(["x509", "-enddate", "-noout", "-in"])
            .arg(path),
        8,
    )
    .await;
    let Ok(output) = output else {
        return (None, None, "unknown".into());
    };
    if !output.status.success() {
        return (None, None, "unknown".into());
    }
    let text = stdout_text(&output);
    let raw = text.trim().strip_prefix("notAfter=").unwrap_or(text.trim());
    let Ok(naive) = NaiveDateTime::parse_from_str(raw, "%b %e %H:%M:%S %Y GMT") else {
        return (Some(raw.to_string()), None, "unknown".into());
    };
    let expires = DateTime::<Utc>::from_naive_utc_and_offset(naive, Utc);
    let days = (expires - Utc::now()).num_days();
    let status = if days < 0 {
        "expired"
    } else if days <= 7 {
        "critical"
    } else if days <= 30 {
        "warning"
    } else {
        "valid"
    };
    (Some(expires.to_rfc3339()), Some(days), status.into())
}

fn nginx_static_config(server_name: &str, root: &str) -> String {
    format!(
        "server {{\n    listen 80;\n    server_name {server_name};\n\n    root {root};\n    index index.html index.htm;\n\n    location / {{\n        try_files $uri $uri/ =404;\n    }}\n}}\n"
    )
}

fn nginx_spa_config(server_name: &str, root: &str) -> String {
    format!(
        "server {{\n    listen 80;\n    server_name {server_name};\n\n    root {root};\n    index index.html;\n\n    location / {{\n        try_files $uri $uri/ /index.html;\n    }}\n\n    location ~* \\.(?:css|js|jpg|jpeg|gif|png|ico|svg|webp|woff2?)$ {{\n        try_files $uri =404;\n        expires 7d;\n        add_header Cache-Control \"public, max-age=604800\";\n    }}\n}}\n"
    )
}

fn nginx_php_config(server_name: &str, root: &str, fastcgi_pass: &str) -> String {
    format!(
        "server {{\n    listen 80;\n    server_name {server_name};\n\n    root {root};\n    index index.php index.html index.htm;\n\n    location / {{\n        try_files $uri $uri/ /index.php?$query_string;\n    }}\n\n    location ~ \\.php$ {{\n        include snippets/fastcgi-php.conf;\n        fastcgi_pass {fastcgi_pass};\n    }}\n\n    location ~ /\\.ht {{\n        deny all;\n    }}\n}}\n"
    )
}

fn nginx_load_balance_config(server_name: &str, params: &Value) -> Result<String> {
    let upstream_name = format!("lightops_{}", sanitize_upstream_name(server_name));
    let upstreams = params
        .get("upstreams")
        .and_then(Value::as_array)
        .ok_or_else(|| anyhow!("缺少上游列表"))?
        .iter()
        .filter_map(Value::as_str)
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .collect::<Vec<_>>();
    if upstreams.is_empty() {
        bail!("至少需要一个上游地址");
    }
    let mut upstream_block = format!("upstream {upstream_name} {{\n");
    for upstream in upstreams {
        validate_nginx_upstream(upstream)?;
        upstream_block.push_str(&format!("    server {upstream};\n"));
    }
    upstream_block.push_str("    keepalive 32;\n}\n\n");
    let mut proxy_params = params.clone();
    if let Some(obj) = proxy_params.as_object_mut() {
        obj.insert("websocket".into(), json!(true));
        obj.insert("gzip".into(), json!(true));
    }
    Ok(format!(
        "{upstream_block}{}",
        nginx_proxy_config(
            server_name,
            &format!("http://{upstream_name}"),
            &proxy_params
        )
    ))
}

fn nginx_proxy_config(server_name: &str, upstream: &str, params: &Value) -> String {
    let websocket = params
        .get("websocket")
        .and_then(Value::as_bool)
        .unwrap_or(true);
    let gzip = params.get("gzip").and_then(Value::as_bool).unwrap_or(true);
    let cache_static = params
        .get("cache_static")
        .and_then(Value::as_bool)
        .unwrap_or(false);
    let force_https = params
        .get("force_https")
        .and_then(Value::as_bool)
        .unwrap_or(false);
    let client_max_body_size = params
        .get("client_max_body_size")
        .and_then(Value::as_str)
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .unwrap_or("64m");
    let client_max_body_size = sanitize_nginx_size(client_max_body_size);
    let mut extra = String::new();
    if force_https {
        extra.push_str(
            "    if ($scheme = http) {\n        return 301 https://$host$request_uri;\n    }\n\n",
        );
    }
    if gzip {
        extra.push_str("    gzip on;\n    gzip_types text/plain text/css application/json application/javascript application/xml image/svg+xml;\n\n");
    }
    let websocket_headers = if websocket {
        "        proxy_http_version 1.1;\n        proxy_set_header Upgrade $http_upgrade;\n        proxy_set_header Connection \"upgrade\";\n"
    } else {
        ""
    };
    let static_cache = if cache_static {
        "\n    location ~* \\.(?:css|js|jpg|jpeg|gif|png|ico|svg|webp|woff2?)$ {\n        proxy_pass {upstream};\n        expires 7d;\n        add_header Cache-Control \"public, max-age=604800\";\n    }\n"
    } else {
        ""
    };
    format!(
        "server {{\n    listen 80;\n    server_name {server_name};\n    client_max_body_size {client_max_body_size};\n\n{extra}    location / {{\n        proxy_pass {upstream};\n        proxy_set_header Host $host;\n        proxy_set_header X-Real-IP $remote_addr;\n        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\n        proxy_set_header X-Forwarded-Proto $scheme;\n{websocket_headers}        proxy_read_timeout 300s;\n        proxy_send_timeout 300s;\n    }}\n{static_cache}}}\n"
    )
    .replace("{upstream}", upstream)
}

fn sanitize_upstream_name(server_name: &str) -> String {
    let name = server_name
        .chars()
        .map(|c| {
            if c.is_ascii_alphanumeric() {
                c.to_ascii_lowercase()
            } else {
                '_'
            }
        })
        .collect::<String>();
    name.trim_matches('_').chars().take(80).collect()
}

fn validate_nginx_upstream(value: &str) -> Result<()> {
    if value.len() > 200
        || value.contains('\0')
        || value.contains(';')
        || value.contains('{')
        || value.contains('}')
        || value.contains('$')
        || value.contains('`')
        || value.contains(' ')
    {
        bail!("上游地址无效：{value}");
    }
    Ok(())
}

fn sanitize_nginx_size(value: &str) -> String {
    if value.len() <= 16
        && value
            .chars()
            .all(|c| c.is_ascii_digit() || matches!(c, 'k' | 'K' | 'm' | 'M' | 'g' | 'G'))
    {
        value.to_string()
    } else {
        "64m".into()
    }
}

fn validate_site_name(name: &str) -> Result<()> {
    if name.len() > 180
        || name.contains('/')
        || name.contains('\\')
        || name.contains("..")
        || name.contains('\0')
    {
        bail!("站点名称无效");
    }
    Ok(())
}

fn validate_domain(domain: &str) -> Result<()> {
    if domain.len() > 253
        || domain.starts_with('-')
        || domain.ends_with('-')
        || domain.contains("..")
        || !domain
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || ".-".contains(c))
    {
        bail!("域名无效：{domain}");
    }
    Ok(())
}

fn validate_email(email: &str) -> Result<()> {
    if email.len() > 254 || email.contains('\0') || !email.contains('@') {
        bail!("邮箱无效");
    }
    Ok(())
}

fn chrono_like_timestamp() -> String {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs()
        .to_string()
}

async fn docker_status() -> Result<Value> {
    let output = run_command(
        Command::new("docker")
            .arg("version")
            .arg("--format")
            .arg("{{json .Server.Version}}"),
        8,
    )
    .await;
    match output {
        Ok(output) => Ok(
            json!({ "installed": output.status.success(), "version": stdout_text(&output).trim() }),
        ),
        Err(_) => Ok(json!({ "installed": false, "version": null })),
    }
}

async fn docker_containers() -> Result<Value> {
    let output = run_command(
        Command::new("docker").args(["ps", "-a", "--format", "{{json .}}"]),
        12,
    )
    .await?;
    let text = output_text(output)?;
    let containers = text
        .lines()
        .filter_map(|line| serde_json::from_str::<Value>(line).ok())
        .map(|v| DockerContainer {
            id: v
                .get("ID")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            image: v
                .get("Image")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            command: v
                .get("Command")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            status: v
                .get("Status")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            names: v
                .get("Names")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            ports: v
                .get("Ports")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
        })
        .collect::<Vec<_>>();
    Ok(json!({ "containers": containers }))
}

async fn docker_inspect(id: String) -> Result<Value> {
    validate_docker_id(&id)?;
    let output = run_command(Command::new("docker").args(["inspect", &id]), 20).await?;
    let text = output_text(output)?;
    let parsed: Value = serde_json::from_str(&text).context("Docker inspect 输出不是有效 JSON")?;
    let detail = parsed
        .as_array()
        .and_then(|items| items.first())
        .cloned()
        .unwrap_or(parsed);
    Ok(json!({ "id": id, "detail": detail }))
}

async fn docker_stats(id: String) -> Result<Value> {
    validate_docker_id(&id)?;
    let output = run_command(
        Command::new("docker").args(["stats", "--no-stream", "--format", "{{json .}}", &id]),
        20,
    )
    .await?;
    let text = output_text(output)?;
    let stats = text
        .lines()
        .find_map(|line| serde_json::from_str::<Value>(line).ok())
        .unwrap_or_else(|| json!({}));
    Ok(json!({ "id": id, "stats": stats }))
}

async fn docker_images() -> Result<Value> {
    let output = run_command(
        Command::new("docker").args(["images", "--format", "{{json .}}"]),
        12,
    )
    .await?;
    let text = output_text(output)?;
    let images = text
        .lines()
        .filter_map(|line| serde_json::from_str::<Value>(line).ok())
        .map(|v| DockerImage {
            repository: v
                .get("Repository")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            tag: v
                .get("Tag")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            id: v
                .get("ID")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
            size: v
                .get("Size")
                .and_then(Value::as_str)
                .unwrap_or_default()
                .to_string(),
        })
        .collect::<Vec<_>>();
    Ok(json!({ "images": images }))
}

async fn docker_volumes() -> Result<Value> {
    let output = run_command(
        Command::new("docker").args(["volume", "ls", "--format", "{{json .}}"]),
        12,
    )
    .await?;
    let text = output_text(output)?;
    let volumes = text
        .lines()
        .filter_map(|line| serde_json::from_str::<Value>(line).ok())
        .collect::<Vec<_>>();
    Ok(json!({ "volumes": volumes }))
}

async fn docker_volume_delete(name: String) -> Result<Value> {
    validate_docker_volume_name(&name)?;
    command_value(run_command(Command::new("docker").args(["volume", "rm", &name]), 60).await?)
}

async fn docker_simple(action: &str, id: String) -> Result<Value> {
    validate_docker_id(&id)?;
    command_value(run_command(Command::new("docker").args([action, &id]), 30).await?)
}

async fn docker_logs(id: String, tail: u64) -> Result<Value> {
    validate_docker_id(&id)?;
    let tail = tail.min(2000).to_string();
    command_value(
        run_command(
            Command::new("docker").args(["logs", "--tail", &tail, &id]),
            30,
        )
        .await?,
    )
}

async fn docker_rmi(id: String) -> Result<Value> {
    validate_docker_id(&id)?;
    command_value(run_command(Command::new("docker").args(["rmi", &id]), 60).await?)
}

async fn docker_pull(image: String) -> Result<Value> {
    validate_docker_image(&image)?;
    command_value(run_command(Command::new("docker").args(["pull", &image]), 600).await?)
}

async fn docker_run(params: Value) -> Result<Value> {
    let image = string_param(&params, "image")?;
    validate_docker_image(&image)?;
    let mut cmd = Command::new("docker");
    cmd.arg("run");
    if params
        .get("detach")
        .and_then(Value::as_bool)
        .unwrap_or(true)
    {
        cmd.arg("-d");
    }
    if let Some(name) = params.get("name").and_then(Value::as_str).map(str::trim) {
        if !name.is_empty() {
            validate_container_name(name)?;
            cmd.args(["--name", name]);
        }
    }
    if let Some(restart) = params.get("restart").and_then(Value::as_str) {
        validate_restart_policy(restart)?;
        if restart != "no" {
            cmd.args(["--restart", restart]);
        }
    }
    if let Some(items) = params.get("ports").and_then(Value::as_array) {
        for item in items {
            let host = item
                .get("host")
                .and_then(Value::as_u64)
                .ok_or_else(|| anyhow!("端口映射缺少宿主机端口"))?;
            let container = item
                .get("container")
                .and_then(Value::as_u64)
                .ok_or_else(|| anyhow!("端口映射缺少容器端口"))?;
            validate_port(host)?;
            validate_port(container)?;
            let protocol = item
                .get("protocol")
                .and_then(Value::as_str)
                .unwrap_or("tcp");
            if !matches!(protocol, "tcp" | "udp") {
                bail!("端口协议只支持 tcp/udp");
            }
            cmd.args(["-p", &format!("{host}:{container}/{protocol}")]);
        }
    }
    if let Some(items) = params.get("volumes").and_then(Value::as_array) {
        for item in items {
            let host = item
                .get("host")
                .and_then(Value::as_str)
                .ok_or_else(|| anyhow!("卷映射缺少宿主机路径"))?;
            let container = item
                .get("container")
                .and_then(Value::as_str)
                .ok_or_else(|| anyhow!("卷映射缺少容器路径"))?;
            validate_volume_path(host)?;
            validate_volume_path(container)?;
            let suffix = if item
                .get("readonly")
                .and_then(Value::as_bool)
                .unwrap_or(false)
            {
                ":ro"
            } else {
                ""
            };
            cmd.args(["-v", &format!("{host}:{container}{suffix}")]);
        }
    }
    if let Some(env) = params.get("env").and_then(Value::as_object) {
        for (key, value) in env {
            validate_env_key(key)?;
            let value = value.as_str().unwrap_or_default();
            if value.contains('\0') || value.len() > 2048 {
                bail!("环境变量值无效");
            }
            cmd.args(["-e", &format!("{key}={value}")]);
        }
    }
    cmd.arg(&image);
    if let Some(command) = params.get("command").and_then(Value::as_str).map(str::trim) {
        if !command.is_empty() {
            validate_command_args(command)?;
            for part in command.split_whitespace() {
                cmd.arg(part);
            }
        }
    }
    command_value(run_command(&mut cmd, 120).await?)
}

async fn docker_compose_projects() -> Result<Value> {
    let output = run_command(
        Command::new("docker").args(["ps", "-a", "--format", "{{json .}}"]),
        12,
    )
    .await?;
    let text = output_text(output)?;
    let mut projects = serde_json::Map::new();
    for line in text.lines() {
        let Ok(value) = serde_json::from_str::<Value>(line) else {
            continue;
        };
        let labels = value
            .get("Labels")
            .and_then(Value::as_str)
            .unwrap_or_default();
        let Some(project) = label_value(labels, "com.docker.compose.project") else {
            continue;
        };
        let service = label_value(labels, "com.docker.compose.service").unwrap_or_default();
        let status = value
            .get("Status")
            .and_then(Value::as_str)
            .unwrap_or_default();
        let entry = projects.entry(project.clone()).or_insert_with(|| {
            json!({
                "name": project,
                "services": [],
                "containers": [],
                "running": 0,
                "stopped": 0,
                "status": "Stopped"
            })
        });
        if let Some(obj) = entry.as_object_mut() {
            push_unique_json_string(obj, "services", &service);
            if let Some(id) = value.get("ID").and_then(Value::as_str) {
                push_unique_json_string(obj, "containers", id);
            }
            let key = if status.starts_with("Up") {
                "running"
            } else {
                "stopped"
            };
            let next = obj.get(key).and_then(Value::as_u64).unwrap_or(0) + 1;
            obj.insert(key.into(), json!(next));
            obj.insert(
                "status".into(),
                json!(if status.starts_with("Up") {
                    "Running"
                } else {
                    "Stopped"
                }),
            );
        }
    }
    Ok(json!({ "projects": projects.into_iter().map(|(_, value)| value).collect::<Vec<_>>() }))
}

async fn docker_compose_action(action: &str, project: String) -> Result<Value> {
    validate_compose_project(&project)?;
    let ids = compose_container_ids(&project).await?;
    if ids.is_empty() {
        bail!("未找到 Compose 项目容器");
    }
    let mut cmd = Command::new("docker");
    cmd.arg(action);
    for id in &ids {
        cmd.arg(id);
    }
    command_value(run_command(&mut cmd, 60).await?)
}

async fn docker_compose_logs(project: String, tail: u64) -> Result<Value> {
    validate_compose_project(&project)?;
    let ids = compose_container_ids(&project).await?;
    let tail = tail.min(2000).to_string();
    let mut content = String::new();
    for id in ids {
        let output = run_command(
            Command::new("docker").args(["logs", "--tail", &tail, &id]),
            30,
        )
        .await?;
        content.push_str(&format!("===== {id} =====\n"));
        content.push_str(&stdout_text(&output));
        content.push_str(&stderr_text(&output));
        if !content.ends_with('\n') {
            content.push('\n');
        }
    }
    Ok(json!({ "ok": true, "stdout": content, "stderr": "" }))
}

async fn docker_compose_preflight(params: Value) -> Result<Value> {
    let project = string_param(&params, "project")?;
    validate_compose_project(&project)?;
    let work_dir = path_param(&params, "work_dir")?;
    let data_dir = path_param(&params, "data_dir")?;
    validate_absolute_path(&work_dir)?;
    validate_absolute_path(&data_dir)?;

    let docker = run_command(Command::new("docker").arg("info"), 15).await?;
    if !docker.status.success() {
        bail!("Docker 不可用：{}", stderr_text(&docker));
    }
    let compose = run_command(Command::new("docker").args(["compose", "version"]), 15).await?;
    if !compose.status.success() {
        bail!("Docker Compose 不可用：{}", stderr_text(&compose));
    }
    let ids = compose_container_ids(&project).await?;
    if !ids.is_empty() {
        bail!("Compose 项目名已存在：{project}");
    }
    if work_dir.join("compose.yaml").exists() {
        bail!("工作目录已存在 compose.yaml，为避免覆盖请更换项目名或工作目录");
    }

    let mut warnings = Vec::new();
    if dir_has_entries(&work_dir)? {
        warnings.push(format!("工作目录 {} 非空", work_dir.display()));
    }
    if dir_has_entries(&data_dir)? {
        warnings.push(format!(
            "数据目录 {} 非空，安装会复用该目录",
            data_dir.display()
        ));
    }
    if let Some(ports) = params.get("ports").and_then(Value::as_array) {
        for port in ports {
            let port = port.as_u64().ok_or_else(|| anyhow!("端口必须是数字"))?;
            validate_port(port)?;
            if port_in_use(port as u16).await? {
                bail!("端口已被占用：{port}");
            }
        }
    }

    Ok(json!({
        "ok": true,
        "checks": {
            "docker": true,
            "compose": true,
            "project_available": true,
            "ports_available": true,
            "work_dir_safe": true
        },
        "warnings": warnings
    }))
}

async fn docker_compose_deploy(params: Value) -> Result<Value> {
    let project = string_param(&params, "project")?;
    validate_compose_project(&project)?;
    let work_dir = path_param(&params, "work_dir")?;
    if !work_dir.is_absolute() {
        bail!("工作目录必须是绝对路径");
    }
    let content = string_param(&params, "content")?;
    if content.is_empty() || content.len() > 256 * 1024 {
        bail!("Compose 内容为空或超过 256KB");
    }
    fs::create_dir_all(&work_dir)?;
    let compose_path = work_dir.join("compose.yaml");
    let backup_path = work_dir.join(format!(
        ".compose.yaml.lightops-bak-{}",
        chrono_like_timestamp()
    ));
    let had_old = compose_path.exists();
    if had_old {
        fs::copy(&compose_path, &backup_path)?;
    }
    fs::write(&compose_path, content)?;
    let result = run_command(
        Command::new("docker")
            .arg("compose")
            .args(["-p", &project])
            .arg("-f")
            .arg(&compose_path)
            .args(["up", "-d"]),
        180,
    )
    .await;
    match result {
        Ok(output) if output.status.success() => Ok(json!({
            "ok": true,
            "stdout": stdout_text(&output),
            "stderr": stderr_text(&output),
            "work_dir": work_dir,
            "compose_file": compose_path
        })),
        Ok(output) => {
            if had_old {
                let _ = fs::copy(&backup_path, &compose_path);
            } else {
                let _ = fs::remove_file(&compose_path);
            }
            bail!("{}", stderr_text(&output))
        }
        Err(err) => {
            if had_old {
                let _ = fs::copy(&backup_path, &compose_path);
            } else {
                let _ = fs::remove_file(&compose_path);
            }
            Err(err)
        }
    }
}

fn validate_absolute_path(path: &Path) -> Result<()> {
    if path.is_absolute()
        && path.to_string_lossy().len() <= 300
        && !path.to_string_lossy().contains('\0')
    {
        Ok(())
    } else {
        bail!("路径必须是安全的绝对路径")
    }
}

fn dir_has_entries(path: &Path) -> Result<bool> {
    if !path.exists() {
        return Ok(false);
    }
    if !path.is_dir() {
        bail!("路径不是目录：{}", path.display());
    }
    Ok(fs::read_dir(path)?.next().is_some())
}

async fn port_in_use(port: u16) -> Result<bool> {
    let output = run_command(Command::new("ss").args(["-H", "-tuln"]), 8).await;
    let text = match output {
        Ok(output) if output.status.success() => stdout_text(&output),
        _ => {
            let output = run_command(Command::new("netstat").args(["-tuln"]), 8).await?;
            if !output.status.success() {
                return Ok(false);
            }
            stdout_text(&output)
        }
    };
    Ok(text.lines().any(|line| line_has_port(line, port)))
}

fn line_has_port(line: &str, port: u16) -> bool {
    let suffix = format!(":{port}");
    line.split_whitespace()
        .any(|part| part.ends_with(&suffix) || part.contains(&format!("{suffix} ")))
}

async fn docker_compose_update(params: Value) -> Result<Value> {
    let (project, compose_path) = compose_file_params(&params)?;
    let pull = run_command(
        Command::new("docker")
            .arg("compose")
            .args(["-p", &project])
            .arg("-f")
            .arg(&compose_path)
            .arg("pull"),
        300,
    )
    .await?;
    if !pull.status.success() {
        bail!("{}", stderr_text(&pull));
    }
    let up = run_command(
        Command::new("docker")
            .arg("compose")
            .args(["-p", &project])
            .arg("-f")
            .arg(&compose_path)
            .args(["up", "-d"]),
        180,
    )
    .await?;
    command_value_with_extra(
        up,
        json!({
            "pull_stdout": stdout_text(&pull),
            "pull_stderr": stderr_text(&pull),
            "compose_file": compose_path
        }),
    )
}

async fn docker_compose_down(params: Value) -> Result<Value> {
    let (project, compose_path) = compose_file_params(&params)?;
    command_value(
        run_command(
            Command::new("docker")
                .arg("compose")
                .args(["-p", &project])
                .arg("-f")
                .arg(&compose_path)
                .arg("down"),
            120,
        )
        .await?,
    )
}

fn compose_file_params(params: &Value) -> Result<(String, PathBuf)> {
    let project = string_param(params, "project")?;
    validate_compose_project(&project)?;
    let work_dir = path_param(params, "work_dir")?;
    if !work_dir.is_absolute() {
        bail!("工作目录必须是绝对路径");
    }
    let compose_path = work_dir.join("compose.yaml");
    if !compose_path.exists() {
        bail!("Compose 文件不存在");
    }
    Ok((project, compose_path))
}

async fn compose_container_ids(project: &str) -> Result<Vec<String>> {
    let label = format!("label=com.docker.compose.project={project}");
    let output = run_command(
        Command::new("docker").args(["ps", "-aq", "--filter", &label]),
        12,
    )
    .await?;
    output_text(output).map(|text| {
        text.lines()
            .map(str::trim)
            .filter(|line| !line.is_empty())
            .map(ToString::to_string)
            .collect()
    })
}

fn label_value(labels: &str, key: &str) -> Option<String> {
    labels.split(',').find_map(|item| {
        item.trim()
            .strip_prefix(&format!("{key}="))
            .map(ToString::to_string)
    })
}

fn push_unique_json_string(obj: &mut serde_json::Map<String, Value>, key: &str, value: &str) {
    if value.is_empty() {
        return;
    }
    let values = obj.entry(key.to_string()).or_insert_with(|| json!([]));
    if let Some(array) = values.as_array_mut() {
        if !array.iter().any(|item| item.as_str() == Some(value)) {
            array.push(json!(value));
        }
    }
}

fn validate_docker_id(id: &str) -> Result<()> {
    if id.len() > 200
        || !id
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || ".:/@_-".contains(c))
    {
        bail!("Docker 标识无效");
    }
    Ok(())
}

fn validate_docker_image(image: &str) -> Result<()> {
    if image.is_empty()
        || image.len() > 255
        || image.contains('\0')
        || image.starts_with('-')
        || image.contains("://")
        || !image
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || ".:/@_-".contains(c))
    {
        bail!("Docker 镜像名称无效");
    }
    Ok(())
}

fn validate_container_name(name: &str) -> Result<()> {
    if name.len() > 128
        || !name
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || "._-".contains(c))
    {
        bail!("容器名称无效");
    }
    Ok(())
}

fn validate_restart_policy(policy: &str) -> Result<()> {
    if matches!(policy, "no" | "always" | "unless-stopped" | "on-failure") {
        Ok(())
    } else {
        bail!("重启策略无效")
    }
}

fn validate_port(port: u64) -> Result<()> {
    if (1..=65535).contains(&port) {
        Ok(())
    } else {
        bail!("端口无效")
    }
}

fn validate_volume_path(path: &str) -> Result<()> {
    if path.is_empty()
        || path.len() > 300
        || path.contains('\0')
        || path.contains('\n')
        || path.contains('\r')
    {
        bail!("卷路径无效");
    }
    Ok(())
}

fn validate_docker_volume_name(name: &str) -> Result<()> {
    if name.is_empty()
        || name.len() > 255
        || name.starts_with('-')
        || !name
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || "._-".contains(c))
    {
        bail!("Docker volume 名称无效");
    }
    Ok(())
}

fn validate_env_key(key: &str) -> Result<()> {
    if key.is_empty()
        || key.len() > 80
        || !key
            .chars()
            .all(|c| c.is_ascii_uppercase() || c.is_ascii_digit() || c == '_')
    {
        bail!("环境变量名无效，建议使用大写字母、数字和下划线");
    }
    Ok(())
}

fn validate_command_args(command: &str) -> Result<()> {
    if command.len() > 500
        || command.contains('\0')
        || command.contains("&&")
        || command.contains("||")
        || command.contains(';')
        || command.contains('`')
        || command.contains("$(")
    {
        bail!("容器命令不安全");
    }
    Ok(())
}

fn validate_compose_project(project: &str) -> Result<()> {
    if project.is_empty()
        || project.len() > 128
        || !project
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || "._-".contains(c))
    {
        bail!("Compose 项目名称无效");
    }
    Ok(())
}

async fn run_command(cmd: &mut Command, timeout_secs: u64) -> Result<std::process::Output> {
    timeout(Duration::from_secs(timeout_secs), cmd.output())
        .await
        .map_err(|_| anyhow!("命令执行超时"))?
        .map_err(Into::into)
}

fn command_value(output: std::process::Output) -> Result<Value> {
    let success = output.status.success();
    let stdout = stdout_text(&output);
    let stderr = stderr_text(&output);
    if !success {
        bail!("{}", if stderr.is_empty() { stdout } else { stderr });
    }
    Ok(json!({ "ok": true, "stdout": stdout, "stderr": stderr }))
}

fn command_value_with_extra(output: std::process::Output, extra: Value) -> Result<Value> {
    let mut value = command_value(output)?;
    if let (Some(value), Some(extra)) = (value.as_object_mut(), extra.as_object()) {
        for (key, item) in extra {
            value.insert(key.clone(), item.clone());
        }
    }
    Ok(value)
}

fn output_text(output: std::process::Output) -> Result<String> {
    if output.status.success() {
        Ok(String::from_utf8_lossy(&output.stdout).to_string())
    } else {
        bail!("{}", String::from_utf8_lossy(&output.stderr));
    }
}

fn stdout_text(output: &std::process::Output) -> String {
    String::from_utf8_lossy(&output.stdout).to_string()
}

fn stderr_text(output: &std::process::Output) -> String {
    String::from_utf8_lossy(&output.stderr).to_string()
}