import { createStore } from "zustand/vanilla";
import { persist, createJSONStorage } from "zustand/middleware";
import type { CourseKind, RecordItem, RecordType, WorkListItem, ExamListItem } from "~/service/wk";
import type { CourseType } from "~/types/Course";
import type { userInfoType } from "~/types/Userinfo";

const withLogTimestamp = (message: string) => {
  if (/^\[\d{2}:\d{2}:\d{2}\]\s/.test(message)) {
    return message;
  }

  const now = new Date();
  const timestamp = now.toLocaleTimeString("zh-CN", {
    hour12: false,
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
  });

  return `[${timestamp}] ${message}`;
};
const MAX_STUDY_LOGS_PER_ACCOUNT = 1000;

export type AccountAuth = {
  password: string;
  token: string;
};

export type AccountItem = {
  id: string;
  username: string;
  host: string;
  status: CourseKind;
  sessionId: string;
  auth: AccountAuth;
  user: userInfoType;
  courses: CourseType[];
};

export type RecordCacheMap = Record<string, RecordItem[]>;

export type WorkExamCacheMap = Record<string, WorkListItem[] | ExamListItem[]>;

type PersistPreferences = {
  persistAccounts: boolean;
  persistRecords: boolean;
  persistLogs: boolean;
};

const settingsStorageKey = "settings-storage";
const defaultPersistPreferences: PersistPreferences = {
  persistAccounts: true,
  persistRecords: true,
  persistLogs: true,
};

const resolvePersistPreferences = (): PersistPreferences => {
  try {
    const rawValue = localStorage.getItem(settingsStorageKey);
    if (!rawValue) {
      return defaultPersistPreferences;
    }

    const parsedValue = JSON.parse(rawValue) as {
      state?: Partial<PersistPreferences>;
    };
    const persistedState = parsedValue?.state;

    return {
      persistAccounts:
        persistedState?.persistAccounts ??
        defaultPersistPreferences.persistAccounts,
      persistRecords:
        persistedState?.persistRecords ?? defaultPersistPreferences.persistRecords,
      persistLogs:
        persistedState?.persistLogs ?? defaultPersistPreferences.persistLogs,
    };
  } catch {
    return defaultPersistPreferences;
  }
};

type AccountState = {
  accounts: AccountItem[];
  selectedAccountId: string;
  expandedAccountId: string;
  selectedCourseId: number | null;
  courseKind: CourseKind;
  recordType: RecordType;
  records: RecordItem[];
  recordCacheMap: RecordCacheMap;
  workList: WorkListItem[];
  examList: ExamListItem[];
  workExamCacheMap: WorkExamCacheMap;
  studyLogsMap: Record<string, string[]>;
  runningStudyMap: Record<string, boolean>;
  studyHeartbeatMap: Record<string, number>;
  setSelectedAccountId: (accountId: string) => void;
  setExpandedAccountId: (accountId: string) => void;
  setSelectedCourseId: (courseId: number | null) => void;
  setCourseKind: (courseKind: CourseKind) => void;
  setRecordType: (recordType: RecordType) => void;
  setRecords: (records: RecordItem[]) => void;
  setRecordCache: (cacheKey: string, records: RecordItem[]) => void;
  setWorkList: (list: WorkListItem[]) => void;
  setExamList: (list: ExamListItem[]) => void;
  setWorkExamCache: (cacheKey: string, data: WorkListItem[] | ExamListItem[]) => void;
  setAccountRunningStudy: (accountId: string, value: boolean) => void;
  touchStudyHeartbeat: (accountId: string, timestamp?: number) => void;
  clearStudyHeartbeat: (accountId: string) => void;
  clearAllStudyHeartbeat: () => void;
  appendStudyLog: (accountId: string, message: string) => void;
  clearStudyLogs: (accountId: string) => void;
  clearAllStudyLogs: () => void;
  upsertAccount: (account: AccountItem) => void;
  setAccountCourses: (accountId: string, courses: CourseType[]) => void;
  removeAccount: (accountId: string) => void;
  clearAllData: () => void;
  clearRecordsData: () => void;
  clearAccountsData: () => void;
};

export const accountStore = createStore<AccountState>()(
  persist(
    (set) => ({
      accounts: [],
      selectedAccountId: "",
      expandedAccountId: "",
      selectedCourseId: null,
      courseKind: "run",
      recordType: "",
      records: [],
      recordCacheMap: {},
      workList: [],
      examList: [],
      workExamCacheMap: {},
      studyLogsMap: {},
      runningStudyMap: {},
      studyHeartbeatMap: {},
      setSelectedAccountId: (accountId) =>
        set({ selectedAccountId: accountId }),
      setExpandedAccountId: (accountId) =>
        set({ expandedAccountId: accountId }),
      setSelectedCourseId: (courseId) => set({ selectedCourseId: courseId }),
      setCourseKind: (courseKind) => set({ courseKind }),
      setRecordType: (recordType) => set({ recordType }),
      setRecords: (records) => set({ records }),
      setRecordCache: (cacheKey, records) =>
        set((state) => ({
          recordCacheMap: {
            ...state.recordCacheMap,
            [cacheKey]: records,
          },
        })),
      setWorkList: (list) => set({ workList: list }),
      setExamList: (list) => set({ examList: list }),
      setWorkExamCache: (cacheKey, data) =>
        set((state) => ({
          workExamCacheMap: {
            ...state.workExamCacheMap,
            [cacheKey]: data,
          },
        })),
      setAccountRunningStudy: (accountId, value) =>
        set((state) => ({
          runningStudyMap: {
            ...state.runningStudyMap,
            [accountId]: value,
          },
        })),
      touchStudyHeartbeat: (accountId, timestamp) =>
        set((state) => ({
          studyHeartbeatMap: {
            ...state.studyHeartbeatMap,
            [accountId]: timestamp ?? Date.now(),
          },
        })),
      clearStudyHeartbeat: (accountId) =>
        set((state) => ({
          studyHeartbeatMap: Object.fromEntries(
            Object.entries(state.studyHeartbeatMap).filter(
              ([key]) => key !== accountId,
            ),
          ),
        })),
      clearAllStudyHeartbeat: () =>
        set({
          studyHeartbeatMap: {},
        }),
      appendStudyLog: (accountId, message) =>
        set((state) => {
          const nextLogs = [
            ...(state.studyLogsMap[accountId] ?? []),
            withLogTimestamp(message),
          ].slice(-MAX_STUDY_LOGS_PER_ACCOUNT);

          return {
            studyLogsMap: {
              ...state.studyLogsMap,
              [accountId]: nextLogs,
            },
          };
        }),
      clearStudyLogs: (accountId) =>
        set((state) => ({
          studyLogsMap: {
            ...state.studyLogsMap,
            [accountId]: [],
          },
        })),
      clearAllStudyLogs: () =>
        set({
          studyLogsMap: {},
        }),
      clearAllData: () =>
        set({
          accounts: [],
          selectedAccountId: "",
          expandedAccountId: "",
          selectedCourseId: null,
          courseKind: "run" as CourseKind,
          recordType: "" as RecordType,
          records: [],
          recordCacheMap: {},
          workList: [],
          examList: [],
          workExamCacheMap: {},
          studyLogsMap: {},
          runningStudyMap: {},
          studyHeartbeatMap: {},
        }),
      clearRecordsData: () =>
        set({
          records: [],
          recordCacheMap: {},
          workList: [],
          examList: [],
          workExamCacheMap: {},
          selectedCourseId: null,
        }),
      clearAccountsData: () =>
        set({
          accounts: [],
          selectedAccountId: "",
          expandedAccountId: "",
          selectedCourseId: null,
        }),
      upsertAccount: (account) =>
        set((state) => ({
          accounts: [
            account,
            ...state.accounts.filter((item) => item.id !== account.id),
          ],
          selectedAccountId: account.id,
          expandedAccountId: account.id,
        })),
      setAccountCourses: (accountId, courses) =>
        set((state) => ({
          accounts: state.accounts.map((item) =>
            item.id === accountId ? { ...item, courses } : item,
          ),
        })),
      removeAccount: (accountId) =>
        set((state) => {
          const nextAccounts = state.accounts.filter(
            (item) => item.id !== accountId,
          );
          return {
            accounts: nextAccounts,
            selectedAccountId:
              state.selectedAccountId === accountId
                ? ""
                : state.selectedAccountId,
            expandedAccountId:
              state.expandedAccountId === accountId
                ? ""
                : state.expandedAccountId,
            selectedCourseId:
              state.selectedAccountId === accountId
                ? null
                : state.selectedCourseId,
            records: state.selectedAccountId === accountId ? [] : state.records,
            recordCacheMap: Object.fromEntries(
              Object.entries(state.recordCacheMap).filter(
                ([key]) => !key.startsWith(`${accountId}::`),
              ),
            ),
            studyLogsMap: Object.fromEntries(
              Object.entries(state.studyLogsMap).filter(
                ([key]) => key !== accountId,
              ),
            ),
            runningStudyMap: Object.fromEntries(
              Object.entries(state.runningStudyMap).filter(
                ([key]) => key !== accountId,
              ),
            ),
            studyHeartbeatMap: Object.fromEntries(
              Object.entries(state.studyHeartbeatMap).filter(
                ([key]) => key !== accountId,
              ),
            ),
          };
        }),
    }),
    {
      name: "account-storage",
      storage: createJSONStorage(() => localStorage),
      partialize: (state) => {
        const preferences = resolvePersistPreferences();
        const persistedState: Partial<AccountState> = {
          courseKind: state.courseKind,
          recordType: state.recordType,
        };

        if (preferences.persistAccounts) {
          persistedState.accounts = state.accounts;
          persistedState.selectedAccountId = state.selectedAccountId;
          persistedState.expandedAccountId = state.expandedAccountId;
          persistedState.selectedCourseId = state.selectedCourseId;
        }

        if (preferences.persistRecords) {
          persistedState.records = state.records;
          persistedState.recordCacheMap = state.recordCacheMap;
        }

        if (preferences.persistLogs) {
          persistedState.studyLogsMap = state.studyLogsMap;
        }

        return persistedState;
      },
    },
  ),
);