import { useRef, useState, type RefObject } from 'react';
import { Link, useNavigate } from 'react-router-dom';
import AppImage from '@dukang/shared-ui/AppImage';
import { useStoreSession } from '../contexts/StoreSessionContext';
import {
  getLastPhone,
  request,
  saveRememberedSession,
  type ShopSessionPayload,
} from '../lib/api';
import { routeAfterShopLogin } from './SelectStorePage';

function ShopAgreementCheckbox({
  agreed,
  onChange,
  labelRef,
}: {
  agreed: boolean;
  onChange: (next: boolean) => void;
  labelRef?: RefObject<HTMLLabelElement>;
}) {
  return (
    <label className="shop-login-agreement" ref={labelRef}>
      <input
        type="checkbox"
        checked={agreed}
        onChange={(e) => onChange(e.target.checked)}
      />
      <span>
        我已阅读并同意
        <Link to="/legal/user-agreement" onClick={(e) => e.stopPropagation()}>
          《用户协议》
        </Link>
        与
        <Link to="/legal/privacy-policy" onClick={(e) => e.stopPropagation()}>
          《隐私政策》
        </Link>
      </span>
    </label>
  );
}

export default function LoginPage() {
  const navigate = useNavigate();
  const { applySession } = useStoreSession();
  const [phone, setPhone] = useState(getLastPhone());
  const [code, setCode] = useState('');
  const [agreed, setAgreed] = useState(false);
  const [loading, setLoading] = useState(false);
  const [msg, setMsg] = useState('');
  const [codeCooldown, setCodeCooldown] = useState(0);
  const agreementRef = useRef<HTMLLabelElement>(null);

  function ensureAgreed() {
    if (!agreed) {
      setMsg('请先阅读并同意用户协议');
      agreementRef.current?.scrollIntoView({ behavior: 'smooth', block: 'center' });
      return false;
    }
    return true;
  }

  async function sendCode() {
    if (!ensureAgreed()) return;
    setMsg('');
    try {
      await request('SHOP_H5', '/shop/auth/sms/send', {
        method: 'POST',
        body: JSON.stringify({ phone, scene: 'STORE_LOGIN' }),
      });
      setMsg('验证码已发送');
      setCodeCooldown(60);
      const timer = setInterval(() => {
        setCodeCooldown((c) => {
          if (c <= 1) {
            clearInterval(timer);
            return 0;
          }
          return c - 1;
        });
      }, 1000);
    } catch (e) {
      setMsg(e instanceof Error ? e.message : '发送失败');
    }
  }

  async function login() {
    if (!ensureAgreed()) return;
    setLoading(true);
    setMsg('');
    try {
      const data = await request<ShopSessionPayload>('SHOP_H5', '/shop/auth/login/sms', {
        method: 'POST',
        body: JSON.stringify({ phone, code }),
      });
      saveRememberedSession(data);
      applySession(data);
      routeAfterShopLogin(data, navigate);
    } catch (e) {
      setMsg(e instanceof Error ? e.message : '登录失败');
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="shop-login-page">
      <header className="shop-login-hero">
        <div className="shop-login-logo-wrap">
          <AppImage src="/logo.png" alt="杜康好客" wrapperClassName="app-image--fill" fit="contain" />
        </div>
        <h1 className="shop-login-brand">杜康好客</h1>
        <p className="shop-login-tagline">门店管理系统</p>
      </header>

      <main className="shop-login-main">
        <div className="shop-login-card">
          <div className="shop-login-field">
            <label htmlFor="phone">手机号码</label>
            <div className="shop-login-input-wrap">
              <span className="material-symbols-outlined">phone_iphone</span>
              <input
                id="phone"
                type="tel"
                maxLength={11}
                placeholder="请输入您的手机号"
                value={phone}
                onChange={(e) => setPhone(e.target.value)}
              />
            </div>
          </div>

          <div className="shop-login-field">
            <label htmlFor="code">验证码</label>
            <div className="shop-login-code-row">
              <div className="shop-login-input-wrap">
                <span className="material-symbols-outlined">shield</span>
                <input
                  id="code"
                  type="text"
                  maxLength={6}
                  placeholder="验证码"
                  value={code}
                  onChange={(e) => setCode(e.target.value)}
                />
              </div>
              <button
                type="button"
                className="shop-login-code-btn"
                disabled={codeCooldown > 0}
                onClick={sendCode}
              >
                {codeCooldown > 0 ? `${codeCooldown}s` : '获取验证码'}
              </button>
            </div>
          </div>

          {msg && <p className="shop-login-msg">{msg}</p>}

          <ShopAgreementCheckbox
            agreed={agreed}
            onChange={setAgreed}
            labelRef={agreementRef}
          />

          <button
            type="button"
            className="shop-login-submit"
            disabled={loading}
            onClick={() => void login()}
          >
            <span>{loading ? '登录中...' : '登录'}</span>
            {!loading && <span className="material-symbols-outlined">arrow_forward</span>}
          </button>
          <p className="shop-login-msg" style={{ textAlign: 'center', marginTop: 12 }}>
            手机号验证成功后，7 天内无需再次输入验证码
          </p>
        </div>
      </main>

      <footer className="shop-login-footer">
        <p className="shop-login-footer-brand">Secured by DUKANG HERITAGE</p>
        <span className="material-symbols-outlined shop-fill-icon" style={{ opacity: 0.3, fontSize: 20, color: 'var(--color-outline)' }}>
          security
        </span>
      </footer>
    </div>
  );
}