CREATE TABLE IF NOT EXISTS devices (
    id TEXT PRIMARY KEY,
    device_code TEXT NOT NULL UNIQUE,
    name TEXT NOT NULL,
    type TEXT NOT NULL,
    user_agent TEXT,
    network_group_key TEXT,
    public_ip_hash TEXT,
    is_online INTEGER NOT NULL DEFAULT 0,
    last_seen_at TEXT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS rooms (
    code TEXT PRIMARY KEY,
    creator_device_id TEXT NOT NULL REFERENCES devices(id),
    joiner_device_id TEXT REFERENCES devices(id),
    status TEXT NOT NULL,
    created_at TEXT NOT NULL,
    expires_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS sessions (
    id TEXT PRIMARY KEY,
    initiator_device_id TEXT NOT NULL REFERENCES devices(id),
    target_device_id TEXT NOT NULL REFERENCES devices(id),
    room_code TEXT REFERENCES rooms(code),
    connect_mode TEXT NOT NULL DEFAULT 'p2p',
    status TEXT NOT NULL DEFAULT 'connecting',
    fail_reason TEXT,
    connected_at TEXT,
    closed_at TEXT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS transfers (
    id TEXT PRIMARY KEY,
    session_id TEXT REFERENCES sessions(id),
    kind TEXT NOT NULL,
    name TEXT NOT NULL,
    content TEXT,
    size_bytes INTEGER NOT NULL DEFAULT 0,
    sender_device_id TEXT NOT NULL REFERENCES devices(id),
    receiver_device_id TEXT NOT NULL REFERENCES devices(id),
    transfer_strategy TEXT NOT NULL,
    current_channel TEXT NOT NULL DEFAULT 'p2p',
    fallback_allowed INTEGER NOT NULL DEFAULT 0,
    final_status TEXT NOT NULL DEFAULT 'pending',
    fallback_reason TEXT,
    object_key TEXT,
    expires_at TEXT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS fallback_objects (
    transfer_id TEXT PRIMARY KEY REFERENCES transfers(id) ON DELETE CASCADE,
    bucket TEXT NOT NULL,
    object_key TEXT NOT NULL UNIQUE,
    size_bytes INTEGER NOT NULL DEFAULT 0,
    cleanup_state TEXT NOT NULL DEFAULT 'pending',
    created_at TEXT NOT NULL,
    expires_at TEXT NOT NULL,
    cleaned_at TEXT
);

CREATE TABLE IF NOT EXISTS admin_users (
    username TEXT PRIMARY KEY,
    password_hash TEXT NOT NULL,
    is_active INTEGER NOT NULL DEFAULT 1,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS system_configs (
    config_key TEXT PRIMARY KEY,
    config_value TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS audit_logs (
    id TEXT PRIMARY KEY,
    operator_type TEXT NOT NULL,
    operator_id TEXT,
    action TEXT NOT NULL,
    payload TEXT,
    created_at TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_devices_online ON devices (is_online, last_seen_at DESC);
CREATE INDEX IF NOT EXISTS idx_devices_network_group ON devices (network_group_key);
CREATE INDEX IF NOT EXISTS idx_rooms_status_expires ON rooms (status, expires_at DESC);
CREATE INDEX IF NOT EXISTS idx_sessions_status_created ON sessions (status, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_transfers_status_created ON transfers (final_status, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_transfers_sender_receiver ON transfers (sender_device_id, receiver_device_id);
CREATE INDEX IF NOT EXISTS idx_fallback_objects_expires ON fallback_objects (cleanup_state, expires_at ASC);
CREATE INDEX IF NOT EXISTS idx_audit_logs_created ON audit_logs (created_at DESC);

INSERT INTO system_configs (config_key, config_value, updated_at)
VALUES (
    'transfer_policy',
    '{"max_minio_fallback_size_bytes":10737418240,"minio_capacity_bytes":128849018880,"minio_retention_hours":2,"p2p_connect_timeout_sec":15,"turn_connect_timeout_sec":20,"minio_usage_alert_percent":85,"minio_fallback_enabled":true,"turn_urls":[],"turn_username":"","turn_password":""}',
    STRFTIME('%Y-%m-%dT%H:%M:%fZ', 'now')
)
ON CONFLICT(config_key) DO NOTHING;