/**
 * PocketBase 认证服务 - 客户端使用
 * 登录、注册、登出、获取当前用户
 */

import { getPocketBaseConfig } from "@/config/services.config";
import { PB_STORAGE_KEYS } from "./constants";

export interface AuthUser {
  id: string;
  email: string;
  [key: string]: unknown;
}

export interface AuthResult {
  token: string;
  record: AuthUser;
}

/** 获取 PocketBase 基础 URL（客户端用 NEXT_PUBLIC_ 前缀） */
function getPBUrl(): string {
  return getPocketBaseConfig().url;
}

/** 登录 */
export async function pbLogin(identity: string, password: string): Promise<AuthResult> {
  const url = getPBUrl();
  const res = await fetch(`${url}/api/collections/users/auth-with-password`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ identity, password }),
  });
  if (!res.ok) {
    const err = await res.json();
    throw new Error(err?.message || "登录失败");
  }
  const data = await res.json();
  if (!data?.token) throw new Error("登录响应异常");
  return { token: data.token, record: data.record };
}

/** 注册 */
export async function pbRegister(
  email: string,
  password: string,
  passwordConfirm: string
): Promise<AuthResult> {
  const url = getPBUrl();
  const config = getPocketBaseConfig();
  const res = await fetch(`${url}/api/collections/${config.usersCollection}/records`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ email, password, passwordConfirm }),
  });
  if (!res.ok) {
    const err = await res.json();
    throw new Error(err?.message || "注册失败");
  }
  // 注册成功后自动登录
  return pbLogin(email, password);
}

/** 保存认证信息到 localStorage */
export function pbSaveAuth(token: string, record: AuthUser): void {
  if (typeof window === "undefined") return;
  localStorage.setItem(PB_STORAGE_KEYS.token, token);
  localStorage.setItem(PB_STORAGE_KEYS.user, JSON.stringify(record));
}

/** 登出 - 清除本地存储、支付订单 cookie 和根域 Cookie */
export async function pbLogout(): Promise<void> {
  if (typeof window === "undefined") return;
  localStorage.removeItem(PB_STORAGE_KEYS.token);
  localStorage.removeItem(PB_STORAGE_KEYS.user);
  localStorage.removeItem("join_pay_order");
  try {
    document.cookie = "join_pay_order=; path=/; max-age=0";
  } catch {
    /* ignore */
  }
  try {
    await fetch("/api/auth/logout", { method: "POST" });
  } catch {
    /* ignore */
  }
}

/** 获取当前存储的用户（id + email） */
export function getStoredUser(): AuthUser | null {
  if (typeof window === "undefined") return null;
  try {
    const raw = localStorage.getItem(PB_STORAGE_KEYS.user);
    if (!raw) return null;
    const user = JSON.parse(raw);
    if (!user?.id || !user?.email) return null;
    return { id: user.id, email: user.email };
  } catch {
    return null;
  }
}

/** 获取当前存储的用户邮箱 */
export function getStoredUserEmail(): string | null {
  const user = getStoredUser();
  return user?.email ?? null;
}

/** 获取存储的 token（用于 API 请求） */
export function getStoredToken(): string | null {
  if (typeof window === "undefined") return null;
  return localStorage.getItem(PB_STORAGE_KEYS.token);
}