/**
 * API 客户端
 */

const API_BASE = process.env.NEXT_PUBLIC_API_URL || '';

export interface KLine {
  date: string;
  open: number;
  high: number;
  low: number;
  close: number;
  volume: number;
  amount?: number;
  pct_chg?: number;
  volume_ratio?: number; // 量比
  turnover_rate?: number; // 换手率
}

export interface GameStartResponse {
  code: string | null;
  real_code: string;
  real_name: string;
  start_date: string;
  klines: KLine[];
  total_candles: number;
  initial_price: number;
  initial_index: number;
}

export interface HealthResponse {
  status: string;
  database: string;
  stocks_count: number;
}

export class ApiError extends Error {
  status: number;
  data: any;

  constructor(message: string, status: number, data: any) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
    this.data = data;
  }
}

async function fetchAPI<T>(path: string, options?: RequestInit): Promise<T> {
  const url = `${API_BASE}${path}`;
  const response = await fetch(url, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      ...options?.headers,
    },
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({ detail: 'Unknown error' }));
    // 尝试提取错误信息
    let message = 'API request failed';
    if (typeof errorData.detail === 'string') {
      message = errorData.detail;
    } else if (errorData.detail && errorData.detail.message) {
      message = errorData.detail.message;
    } else if (errorData.error) {
      message = errorData.error;
    }

    throw new ApiError(message, response.status, errorData);
  }

  return response.json();
}

export interface IndexData {
  date: string;
  close: number;
}

export interface AuthResponse {
  token: string;
  user_id: number;
  username: string;
}

export interface UserInfoResponse {
  user_id: number;
  username: string;
  vip_expire_at: string | null;
  is_vip: boolean;
}

export interface VipStatusResponse {
  is_vip: boolean;
  vip_expire_at: string | null;
}

export interface AdminUserItem {
  user_id: number;
  username: string;
  is_vip: boolean;
  vip_expire_at: string | null;
  created_at: string;
  has_payment: boolean;  // 是否有支付记录
  last_login: string | null;  // 最近登录时间
}

export interface CreatePaymentResponse {
  order_id: string;
  price: number;
  type: number;
}


export interface AdminOrderItem {
  order_id: string;
  amount: number;
  pay_type: number;
  status: string;
  created_at: string;
  paid_at: string | null;
  months: number;
}


export const api = {
  health: () => fetchAPI<HealthResponse>('/api/health'),

  startGame: (mode = 'random', market?: string, token?: string) => {
    const params = new URLSearchParams({ mode });
    if (market) params.append('market', market);
    const headers: Record<string, string> = {};
    if (token) headers['Authorization'] = `Bearer ${token}`;
    return fetchAPI<GameStartResponse>(`/api/game/start?${params}`, { headers });
  },

  getKline: (code: string, start?: string, end?: string) => {
    const params = new URLSearchParams({ code });
    if (start) params.append('start', start);
    if (end) params.append('end', end);
    return fetchAPI<KLine[]>(`/api/kline?${params}`);
  },

  getHS300Index: (start?: string, end?: string) => {
    const params = new URLSearchParams();
    if (start) params.append('start', start);
    if (end) params.append('end', end);
    return fetchAPI<IndexData[]>(`/api/index/hs300?${params}`);
  },

  register: (username: string, password: string) =>
    fetchAPI<AuthResponse>('/api/v1/auth/register', {
      method: 'POST',
      body: JSON.stringify({ username, password }),
    }),

  login: (username: string, password: string) =>
    fetchAPI<AuthResponse>('/api/v1/auth/login', {
      method: 'POST',
      body: JSON.stringify({ username, password }),
    }),

  me: (token: string) =>
    fetchAPI<UserInfoResponse>('/api/v1/auth/me', {
      headers: { Authorization: `Bearer ${token}` },
    }),

  vipStatus: (token: string) =>
    fetchAPI<VipStatusResponse>('/api/v1/vip/status', {
      headers: { Authorization: `Bearer ${token}` },
    }),

  logout: (token: string) =>
    fetchAPI<{ status: string }>('/api/v1/auth/logout', {
      method: 'POST',
      headers: { Authorization: `Bearer ${token}` },
    }),

  getUsageToday: (token: string) =>
    fetchAPI<{ used: number; limit: number | null; remaining: number | null; is_vip: boolean }>(
      '/api/v1/usage/today',
      { headers: { Authorization: `Bearer ${token}` } }
    ),

  createPayment: (type: number, months: number, token: string) =>
    fetchAPI<CreatePaymentResponse>('/api/v1/payment/create', {
      method: 'POST',
      headers: { Authorization: `Bearer ${token}` },
      body: JSON.stringify({ type, months }),
    }),

  async checkPaymentStatus(orderId: string): Promise<{ code: number; data: { status: number } }> {
    return fetchAPI(`/api/v1/payment/check/${orderId}`);
  },

  // 管理员接口
  adminGetUsers: (token: string) =>
    fetchAPI<AdminUserItem[]>('/api/v1/admin/users', {
      headers: { Authorization: `Bearer ${token}` },
    }),

  adminUpdatePassword: (userId: number, newPassword: string, token: string) =>
    fetchAPI<{ status: string }>(`/api/v1/admin/user/${userId}/password`, {
      method: 'POST',
      headers: { Authorization: `Bearer ${token}` },
      body: JSON.stringify({ new_password: newPassword }),
    }),

  adminUpdateVip: (userId: number, months: number, token: string) =>
    fetchAPI<{ status: string }>(`/api/v1/admin/user/${userId}/vip`, {
      method: 'POST',
      headers: { Authorization: `Bearer ${token}` },
      body: JSON.stringify({ months }),
    }),

  adminDeleteUser: (userId: number, token: string) =>
    fetchAPI<{ status: string }>(`/api/v1/admin/user/${userId}`, {
      method: 'DELETE',
      headers: { Authorization: `Bearer ${token}` },
    }),

  adminUpdateOrderStatus: (orderId: string, status: string, token: string) =>
    fetchAPI<{ status: string }>(`/api/v1/admin/order/${orderId}/status`, {
      method: 'PUT',
      headers: { Authorization: `Bearer ${token}` },
      body: JSON.stringify({ status }),
    }),

  adminUserOrders: (userId: number, token: string) =>
    fetchAPI<AdminOrderItem[]>(`/api/v1/admin/user/${userId}/orders`, {
      headers: { Authorization: `Bearer ${token}` },
    }),
};