import { API_BASE_URL } from "@/lib/config";

// 用户摘要信息（列表）
export interface UserSummary {
  id: number;
  username: string;
  role: "admin" | "agent";
  nickname: string;
  email: string;
  avatar_url: string;
  receive_ai_conversations: boolean;
  created_at: string;
  updated_at: string;
}

// 创建用户请求
export interface CreateUserRequest {
  username: string;
  password: string;
  role: "admin" | "agent";
  nickname?: string;
  email?: string;
}

// 更新用户请求
export interface UpdateUserRequest {
  role?: "admin" | "agent";
  nickname?: string;
  email?: string;
  receive_ai_conversations?: boolean;
}

// 更新密码请求
export interface UpdatePasswordRequest {
  old_password?: string; // 可选，管理员修改其他用户密码时不需要
  new_password: string;
}

// 获取所有用户列表
export async function fetchUsers(
  currentUserId: number
): Promise<UserSummary[]> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users?current_user_id=${currentUserId}`,
    {
      cache: "no-store",
    }
  );
  if (!res.ok) {
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能查看用户列表");
    }
    if (res.status === 401) {
      throw new Error("未提供当前用户ID");
    }
    throw new Error("获取用户列表失败");
  }
  const data = await res.json();
  if (!Array.isArray(data)) {
    return [];
  }
  return data;
}

// 获取用户详情
export async function fetchUser(
  id: number,
  currentUserId: number
): Promise<UserSummary> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users/${id}?current_user_id=${currentUserId}`,
    {
      cache: "no-store",
    }
  );
  if (!res.ok) {
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能查看用户详情");
    }
    if (res.status === 404) {
      throw new Error("用户不存在");
    }
    throw new Error("获取用户详情失败");
  }
  const data = await res.json();
  return data;
}

// 创建新用户
export async function createUser(
  data: CreateUserRequest,
  currentUserId: number
): Promise<UserSummary> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users?current_user_id=${currentUserId}`,
    {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }
  );
  if (!res.ok) {
    const error = await res.json().catch(() => ({}));
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能创建用户");
    }
    throw new Error(error.error || "创建用户失败");
  }
  const result = await res.json();
  return result.user;
}

// 更新用户信息
export async function updateUser(
  id: number,
  data: UpdateUserRequest,
  currentUserId: number
): Promise<UserSummary> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users/${id}?current_user_id=${currentUserId}`,
    {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }
  );
  if (!res.ok) {
    const error = await res.json().catch(() => ({}));
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能更新用户信息");
    }
    if (res.status === 404) {
      throw new Error("用户不存在");
    }
    throw new Error(error.error || "更新用户失败");
  }
  const result = await res.json();
  return result.user;
}

// 删除用户
export async function deleteUser(
  id: number,
  currentUserId: number
): Promise<void> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users/${id}?current_user_id=${currentUserId}`,
    {
      method: "DELETE",
    }
  );
  if (!res.ok) {
    const error = await res.json().catch(() => ({}));
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能删除用户");
    }
    if (res.status === 404) {
      throw new Error("用户不存在");
    }
    throw new Error(error.error || "删除用户失败");
  }
}

// 更新用户密码
export async function updateUserPassword(
  id: number,
  data: UpdatePasswordRequest,
  currentUserId: number
): Promise<void> {
  const res = await fetch(
    `${API_BASE_URL}/admin/users/${id}/password?current_user_id=${currentUserId}`,
    {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(data),
    }
  );
  if (!res.ok) {
    const error = await res.json().catch(() => ({}));
    if (res.status === 403) {
      throw new Error("权限不足，只有管理员才能修改用户密码");
    }
    if (res.status === 404) {
      throw new Error("用户不存在");
    }
    throw new Error(error.error || "更新密码失败");
  }
}