import { create } from "zustand";

import {
  ApiRequestError,
  type Employee,
  type Workspace,
  type WorkspaceBoundApi,
} from "../../../services/api";

import { useScriptWorkspaceStore } from "../../platform/state/scriptWorkspaceStore";
import { useUiStore } from "../../platform/state/uiStore";

type Notice = {
  tone: "success" | "error" | "info";
  message: string;
};

// ---- Users domain ----

export type UserForm = {
  username: string;
  display_name: string;
  email: string;
  role_code: "admin" | "developer";
  password: string;
  status: "active" | "disabled" | "locked";
};

export const EMPTY_USER_FORM: UserForm = {
  username: "",
  display_name: "",
  email: "",
  role_code: "developer",
  password: "",
  status: "active",
};

// ---- Projects domain ----

export type ProjectForm = {
  workspace_code: string;
  workspace_name: string;
  quota_bytes: number;
  description: string;
};

export const EMPTY_PROJECT_FORM: ProjectForm = {
  workspace_code: "",
  workspace_name: "",
  quota_bytes: 0,
  description: "",
};

// ---- Module-level non-reactive holder ----

let _api: WorkspaceBoundApi | null = null;

export const bindAdminApi = (api: WorkspaceBoundApi | null) => {
  _api = api;
};

function requireApi(): WorkspaceBoundApi {
  if (!_api) throw new Error("admin API 未绑定");
  return _api;
}

function pushToast(notice: Notice) {
  useUiStore.getState().pushToast(notice);
}

function setApiOnline(online: boolean) {
  useScriptWorkspaceStore.getState().setApiOnline(online);
}

// ---- Store ----

type State = {
  // users
  employees: Employee[];
  usersLoading: boolean;
  usersSaving: boolean;
  editingUser: Employee | null;
  userDialogOpen: boolean;
  userForm: UserForm;
  userSearchTerm: string;

  // projects
  projects: Workspace[];
  projectsLoading: boolean;
  projectsSaving: boolean;
  editingProject: Workspace | null;
  projectDialogOpen: boolean;
  projectForm: ProjectForm;
  selectedProject: Workspace | null;
  availableUsers: Employee[];
  selectedUserIds: string[];
  selectedRoleCode: "admin" | "developer";
  projectSearchTerm: string;
  importMemberDialogOpen: boolean;
};

type Actions = {
  bindApi: (api: WorkspaceBoundApi | null) => void;
  reset: () => void;

  // users setters
  setEmployees: (updater: (current: Employee[]) => Employee[]) => void;
  setUsersLoading: (loading: boolean) => void;
  setUsersSaving: (saving: boolean) => void;
  setEditingUser: (e: Employee | null) => void;
  setUserDialogOpen: (open: boolean) => void;
  setUserForm: (form: UserForm) => void;
  setUserSearchTerm: (k: string) => void;

  // projects setters
  setProjects: (updater: (current: Workspace[]) => Workspace[]) => void;
  setProjectsLoading: (loading: boolean) => void;
  setProjectsSaving: (saving: boolean) => void;
  setEditingProject: (p: Workspace | null) => void;
  setProjectDialogOpen: (open: boolean) => void;
  setProjectForm: (form: ProjectForm) => void;
  setSelectedProject: (p: Workspace | null) => void;
  setAvailableUsers: (users: Employee[]) => void;
  setSelectedUserIds: (ids: string[]) => void;
  setSelectedRoleCode: (r: "admin" | "developer") => void;
  setProjectSearchTerm: (k: string) => void;
  setImportMemberDialogOpen: (open: boolean) => void;

  // users actions
  loadEmployees: () => Promise<void>;
  createEmployee: (
    input: {
      username: string;
      display_name: string;
      email?: string | null;
      role_code: "admin" | "developer";
      password: string;
      status?: "active" | "disabled" | "locked";
    },
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  updateEmployee: (
    employee: Employee,
    input: {
      display_name: string;
      email?: string | null;
      role_code: "admin" | "developer";
      status: "active" | "disabled" | "locked";
    },
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  deleteEmployee: (
    employee: Employee,
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;

  // projects actions
  loadProjects: (
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  createProject: (
    input: {
      workspace_code: string;
      workspace_name: string;
      quota_bytes: number;
      description?: string;
    },
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  updateProject: (
    workspace: Workspace,
    input: {
      workspace_name: string;
      quota_bytes: number;
      description?: string;
    },
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  deleteProject: (
    workspace: Workspace,
    onNotify: (n: Notice) => void,
    onConnectionChange: (online: boolean) => void,
  ) => Promise<void>;
  openImportMembers: (
    workspace: Workspace,
    onNotify: (n: Notice) => void,
  ) => Promise<void>;
  importMembers: (
    workspace: Workspace,
    user_ids: string[],
    role_code: "admin" | "developer",
    onNotify: (n: Notice) => void,
  ) => Promise<void>;
};

const initial: State = {
  employees: [],
  usersLoading: true,
  usersSaving: false,
  editingUser: null,
  userDialogOpen: false,
  userForm: EMPTY_USER_FORM,
  userSearchTerm: "",

  projects: [],
  projectsLoading: true,
  projectsSaving: false,
  editingProject: null,
  projectDialogOpen: false,
  projectForm: EMPTY_PROJECT_FORM,
  selectedProject: null,
  availableUsers: [],
  selectedUserIds: [],
  selectedRoleCode: "developer",
  projectSearchTerm: "",
  importMemberDialogOpen: false,
};

async function handleError(
  error: unknown,
  fallback: string,
  onNotify: (n: Notice) => void,
): Promise<void> {
  if (error instanceof ApiRequestError && error.status === 401) {
    onNotify({ tone: "error", message: "登录已失效,请重新登录" });
    return;
  }
  if (error instanceof ApiRequestError && error.status === 403) {
    onNotify({ tone: "error", message: "没有权限执行该操作" });
    return;
  }
  if (error instanceof ApiRequestError && error.status === 409) {
    onNotify({
      tone: "error",
      message:
        error.message
        || "操作冲突,目标资源可能已存在或状态不一致",
    });
    return;
  }
  onNotify({
    tone: "error",
    message: error instanceof Error ? error.message : fallback,
  });
}

export const useAdminStore = create<State & Actions>((set, get) => ({
  ...initial,

  bindApi: bindAdminApi,

  reset: () => set({ ...initial, usersLoading: true, projectsLoading: true }),

  // ---- users setters ----

  setEmployees: (updater) =>
    set((state) => ({ employees: updater(state.employees) })),
  setUsersLoading: (loading) => set({ usersLoading: loading }),
  setUsersSaving: (saving) => set({ usersSaving: saving }),
  setEditingUser: (e) => set({ editingUser: e }),
  setUserDialogOpen: (open) => set({ userDialogOpen: open }),
  setUserForm: (form) => set({ userForm: form }),
  setUserSearchTerm: (k) => set({ userSearchTerm: k }),

  // ---- projects setters ----

  setProjects: (updater) =>
    set((state) => ({ projects: updater(state.projects) })),
  setProjectsLoading: (loading) => set({ projectsLoading: loading }),
  setProjectsSaving: (saving) => set({ projectsSaving: saving }),
  setEditingProject: (p) => set({ editingProject: p }),
  setProjectDialogOpen: (open) => set({ projectDialogOpen: open }),
  setProjectForm: (form) => set({ projectForm: form }),
  setSelectedProject: (p) => set({ selectedProject: p }),
  setAvailableUsers: (users) => set({ availableUsers: users }),
  setSelectedUserIds: (ids) => set({ selectedUserIds: ids }),
  setSelectedRoleCode: (r) => set({ selectedRoleCode: r }),
  setProjectSearchTerm: (k) => set({ projectSearchTerm: k }),
  setImportMemberDialogOpen: (open) => set({ importMemberDialogOpen: open }),

  // ---- users actions ----

  loadEmployees: async () => {
    const api = requireApi();
    set({ usersLoading: true });
    try {
      const list = await api.listEmployees();
      set({ employees: list });
      setApiOnline(true);
    } catch (error) {
      setApiOnline(false);
      pushToast({
        tone: "error",
        message: error instanceof Error ? error.message : "用户列表加载失败",
      });
    } finally {
      set({ usersLoading: false });
    }
  },

  createEmployee: async (form, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().usersSaving) return;
    set({ usersSaving: true });
    try {
      const created = await api.createEmployee(form);
      set((state) => ({ employees: [created, ...state.employees] }));
      set({ userDialogOpen: false, editingUser: null });
      onConnectionChange(true);
      onNotify({ tone: "success", message: "用户已创建" });
    } catch (error) {
      await handleError(error, "创建用户失败", onNotify);
    } finally {
      set({ usersSaving: false });
    }
  },

  updateEmployee: async (employee, form, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().usersSaving) return;
    set({ usersSaving: true });
    try {
      const updated = await api.updateEmployee(employee.user_id, form);
      set((state) => ({
        employees: state.employees.map((e) =>
          e.user_id === updated.user_id ? updated : e
        ),
      }));
      set({ userDialogOpen: false, editingUser: null });
      onConnectionChange(true);
      onNotify({ tone: "success", message: "用户已更新" });
    } catch (error) {
      await handleError(error, "更新用户失败", onNotify);
    } finally {
      set({ usersSaving: false });
    }
  },

  deleteEmployee: async (employee, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().usersSaving) return;
    set({ usersSaving: true });
    try {
      await api.deleteEmployee(employee.user_id);
      set((state) => ({
        employees: state.employees.filter((e) => e.user_id !== employee.user_id),
      }));
      onConnectionChange(true);
      onNotify({ tone: "success", message: "用户已删除" });
    } catch (error) {
      await handleError(error, "删除用户失败", onNotify);
    } finally {
      set({ usersSaving: false });
    }
  },

  // ---- projects actions ----

  loadProjects: async (onNotify, onConnectionChange) => {
    const api = requireApi();
    set({ projectsLoading: true });
    try {
      const list = await api.listWorkspaces();
      set({ projects: list });
      onConnectionChange(true);
    } catch (error) {
      onConnectionChange(false);
      await handleError(error, "项目列表加载失败", onNotify);
    } finally {
      set({ projectsLoading: false });
    }
  },

  createProject: async (form, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().projectsSaving) return;
    set({ projectsSaving: true });
    try {
      const created = await api.createWorkspace(form);
      set((state) => ({ projects: [created, ...state.projects] }));
      set({ projectDialogOpen: false, editingProject: null });
      onConnectionChange(true);
      onNotify({ tone: "success", message: "项目已创建" });
    } catch (error) {
      await handleError(error, "创建项目失败", onNotify);
    } finally {
      set({ projectsSaving: false });
    }
  },

  updateProject: async (workspace, form, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().projectsSaving) return;
    set({ projectsSaving: true });
    try {
      const updated = await api.updateWorkspace(workspace.workspace_id, form);
      set((state) => ({
        projects: state.projects.map((p) =>
          p.workspace_id === updated.workspace_id ? updated : p
        ),
      }));
      set({ projectDialogOpen: false, editingProject: null });
      onConnectionChange(true);
      onNotify({ tone: "success", message: "项目已更新" });
    } catch (error) {
      await handleError(error, "更新项目失败", onNotify);
    } finally {
      set({ projectsSaving: false });
    }
  },

  deleteProject: async (workspace, onNotify, onConnectionChange) => {
    const api = requireApi();
    if (get().projectsSaving) return;
    set({ projectsSaving: true });
    try {
      await api.deleteWorkspace(workspace.workspace_id);
      set((state) => ({
        projects: state.projects.filter(
          (p) => p.workspace_id !== workspace.workspace_id,
        ),
      }));
      onConnectionChange(true);
      onNotify({ tone: "success", message: "项目已删除" });
    } catch (error) {
      await handleError(error, "删除项目失败", onNotify);
    } finally {
      set({ projectsSaving: false });
    }
  },

  openImportMembers: async (workspace, onNotify) => {
    const api = requireApi();
    set({ selectedProject: workspace, importMemberDialogOpen: true });
    try {
      const all = await api.listEmployees();
      const existing = await api.listWorkspaceMembers(workspace.workspace_id);
      const taken = new Set(existing.map((m) => m.user_id));
      set({
        availableUsers: all.filter((u) => !taken.has(u.user_id)),
        selectedUserIds: [],
        selectedRoleCode: "developer",
      });
    } catch (error) {
      await handleError(error, "加载成员候选失败", onNotify);
      set({ importMemberDialogOpen: false });
    }
  },

  importMembers: async (workspace, user_ids, role_code, onNotify) => {
    const api = requireApi();
    try {
      await Promise.all(
        user_ids.map((uid) =>
          api.addWorkspaceMember(workspace.workspace_id, {
            user_id: uid,
            role_code,
          }),
        ),
      );
      set({ importMemberDialogOpen: false });
      onNotify({
        tone: "success",
        message: `已添加 ${user_ids.length} 名成员`,
      });
    } catch (error) {
      await handleError(error, "导入成员失败", onNotify);
    }
  },
}));