import { useState } from 'react';
import { View, Text, Input, Button } from '@tarojs/components';
import Taro from '@tarojs/taro';
import { safeNavigateTo } from '@/utils/navigate';
import { useAuthStore } from '../../stores/auth';
import './index.scss';

const IS_DEV = process.env.NODE_ENV !== 'production';
const IS_SIMULATOR = typeof __wxConfig !== 'undefined' && (__wxConfig as any).envVersion !== 'release';

export default function Login() {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [showPassword, setShowPassword] = useState(false);
  const [agreed, setAgreed] = useState(false);
  const [needBind, setNeedBind] = useState(false);

  const credentialLogin = useAuthStore((s) => s.credentialLogin);
  const login = useAuthStore((s) => s.login);
  const bindPhone = useAuthStore((s) => s.bindPhone);
  const loading = useAuthStore((s) => s.loading);
  const isMedicalStaff = useAuthStore((s) => s.isMedicalStaff);

  const navigateAfterLogin = () => {
    if (isMedicalStaff()) {
      // 使用 redirectTo 替代 reLaunch 避免分包加载超时
      // redirectTo 只替换当前页面，不销毁整个页栈，分包预加载不会被中断
      Taro.redirectTo({
        url: '/pages/pkg-doctor-core/index',
        fail: () => {
          // fallback: 先跳首页再 redirectTo
          Taro.switchTab({
            url: '/pages/index/index',
            success: () => {
              setTimeout(() => {
                Taro.navigateTo({ url: '/pages/pkg-doctor-core/index' });
              }, 500);
            },
          });
        },
      });
    } else {
      Taro.switchTab({ url: '/pages/index/index' });
    }
  };

  const handleCredentialLogin = async () => {
    if (!username.trim()) {
      Taro.showToast({ title: '请输入账号', icon: 'none' });
      return;
    }
    if (!password.trim()) {
      Taro.showToast({ title: '请输入密码', icon: 'none' });
      return;
    }
    if (!agreed) {
      Taro.showToast({ title: '请先阅读并同意用户协议', icon: 'none' });
      return;
    }
    try {
      const success = await credentialLogin(username.trim(), password);
      if (success) {
        navigateAfterLogin();
      } else {
        Taro.showToast({ title: '账号或密码错误', icon: 'none' });
      }
    } catch {
      Taro.showToast({ title: '登录失败，请重试', icon: 'none' });
    }
  };

  const handleWechatLogin = async () => {
    if (!agreed) {
      Taro.showToast({ title: '请先阅读并同意用户协议', icon: 'none' });
      return;
    }
    try {
      const { code } = await Taro.login();
      const result = await login(code);
      if (result) {
        navigateAfterLogin();
      } else {
        setNeedBind(true);
        Taro.showToast({ title: '请授权手机号完成绑定', icon: 'none' });
      }
    } catch (err: any) {
      const msg = err?.message || '登录失败，请重试';
      Taro.showToast({ title: msg.substring(0, 20), icon: 'none', duration: 3000 });
    }
  };

  const handleDevQuickLogin = async () => {
    try {
      const success = await credentialLogin('admin', 'Admin@2026');
      if (success) {
        navigateAfterLogin();
      }
    } catch (err: any) {
      Taro.showToast({ title: err?.message || '登录失败', icon: 'none' });
    }
  };

  const handleGetPhone = async (e: { detail: { errMsg: string; encryptedData: string; iv: string } }) => {
    if (e.detail.errMsg !== 'getPhoneNumber:ok') {
      Taro.showToast({ title: '需要授权手机号', icon: 'none' });
      return;
    }
    const { encryptedData, iv } = e.detail;
    try {
      const success = await bindPhone(encryptedData, iv);
      if (success) {
        navigateAfterLogin();
      }
    } catch (err: any) {
      Taro.showModal({
        title: '绑定手机号失败',
        content: err?.message || '绑定失败',
        confirmText: '重新登录',
        cancelText: '取消',
        success: (res) => { if (res.confirm) setNeedBind(false); },
      });
    }
  };

  return (
    <View className="login-page">
      {/* 品牌区 */}
      <View className="login-brand">
        <View className="login-logo">
          <Text className="login-logo-letter">H</Text>
        </View>
        <Text className="login-title">HMS 健康</Text>
        <Text className="login-subtitle">您的专属健康管家</Text>
      </View>

      {!needBind ? (
        <>
          {/* 账号输入 */}
          <View className="login-field">
            <Input
              className="login-input"
              type="text"
              placeholder="请输入账号"
              placeholderClass="login-placeholder"
              value={username}
              onInput={(e) => setUsername(e.detail.value)}
            />
          </View>

          {/* 密码输入 */}
          <View className="login-field">
            <Input
              className="login-input"
              type="text"
              password={!showPassword}
              placeholder="请输入密码"
              placeholderClass="login-placeholder"
              value={password}
              onInput={(e) => setPassword(e.detail.value)}
            />
            <Text
              className="login-eye"
              onClick={() => setShowPassword(!showPassword)}
            >
              {showPassword ? '隐藏' : '显示'}
            </Text>
          </View>

          {/* 登录按钮 */}
          <View className="login-submit" onClick={handleCredentialLogin}>
            <Text className="login-submit-text">{loading ? '登录中...' : '登录'}</Text>
          </View>

          {/* 分隔线 */}
          <View className="login-divider">
            <View className="login-divider-line" />
            <Text className="login-divider-text">或</Text>
            <View className="login-divider-line" />
          </View>

          {/* 微信一键登录 */}
          <View className="login-wechat-btn" onClick={handleWechatLogin}>
            <Text className="login-wechat-icon">微</Text>
            <Text className="login-wechat-text">微信一键登录</Text>
          </View>
        </>
      ) : (
        <View className="login-bind-section">
          <Button
            className="login-btn-bind"
            openType="getPhoneNumber"
            onGetPhoneNumber={handleGetPhone}
            loading={loading}
          >
            授权手机号完成绑定
          </Button>
        </View>
      )}

      {/* 协议 */}
      <View className="agreement-row">
        <View
          className={`agreement-check ${agreed ? 'checked' : ''}`}
          onClick={() => setAgreed(!agreed)}
        >
          {agreed && <Text className="agreement-check-mark">&#10003;</Text>}
        </View>
        <Text className="agreement-text">
          登录即同意
          <Text className="agreement-link" onClick={() => safeNavigateTo('/pages/legal/user-agreement')}>《用户协议》</Text>
          和
          <Text className="agreement-link" onClick={() => safeNavigateTo('/pages/legal/privacy-policy')}>《隐私政策》</Text>
        </Text>
      </View>

      <View style={{ flex: 1 }} />

      {/* 开发模式 */}
      {(IS_DEV || IS_SIMULATOR) && (
        <View className="login-dev-btn" onClick={handleDevQuickLogin}>
          <Text className="login-dev-btn-text">开发模式快速登录 ›</Text>
        </View>
      )}
    </View>
  );
}