// ============================================================================
// Auth API
// ============================================================================

import { api, saveAuthTokens, clearAuthTokens } from "./client";
import { STORAGE_KEYS } from "@/lib/utils/constants";
import type {
  User,
  AuthInitResponse,
  AuthCompleteRequest,
  AuthCompleteResponse,
  AuthRefreshRequest,
  AuthRefreshResponse,
} from "@/lib/types/api";

export const authApi = {
  /**
   * Initialize Telegram auth flow
   */
  init: () => api.get<AuthInitResponse>("/auth/init", { requireAuth: false }),

  /**
   * Complete auth with one-time token from bot
   */
  complete: async (token: string): Promise<{ access_token: string }> => {
    // GET request with token as query parameter
    const response = await api.get<{ access_token: string }>(
      `/auth/complete?token=${token}`,
      {
        requireAuth: false,
      }
    );

    // Save access token to storage
    if (typeof window !== "undefined") {
      localStorage.setItem(STORAGE_KEYS.ACCESS_TOKEN, response.access_token);
    }

    return response;
  },

  /**
   * Refresh access token
   */
  refresh: async (): Promise<string> => {
    if (typeof window === "undefined") {
      throw new Error("Cannot refresh token on server");
    }

    const refreshToken = localStorage.getItem(STORAGE_KEYS.REFRESH_TOKEN);
    if (!refreshToken) {
      throw new Error("No refresh token available");
    }

    const data: AuthRefreshRequest = { refresh_token: refreshToken };
    const response = await api.post<AuthRefreshResponse>(
      "/auth/refresh",
      data,
      {
        requireAuth: false,
      }
    );

    // Update access token
    localStorage.setItem(STORAGE_KEYS.ACCESS_TOKEN, response.access_token);

    return response.access_token;
  },

  /**
   * Get current user info
   */
  me: () => api.get<User>("/auth/me"),

  /**
   * Logout (clear tokens)
   */
  logout: () => {
    clearAuthTokens();
  },

  /**
   * Get user from storage (no API call)
   */
  getUserFromStorage: (): User | null => {
    if (typeof window === "undefined") return null;

    const userJson = localStorage.getItem(STORAGE_KEYS.USER);
    if (!userJson) return null;

    try {
      return JSON.parse(userJson);
    } catch {
      return null;
    }
  },

  /**
   * Check if user is authenticated
   */
  isAuthenticated: (): boolean => {
    if (typeof window === "undefined") return false;
    return !!localStorage.getItem(STORAGE_KEYS.ACCESS_TOKEN);
  },
};