import { Alert, Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import { colors, spacing } from '../../../src/theme';
import { CARRIER_LABEL } from '../../../src/constants';
import { useAgreementGate, useCarrierPhone, useLogin, useOnboarding } from '../../../src/hooks';
import { useAuth } from '../../../src/context/AuthContext';
import { ScreenShell } from '../ui/ScreenShell';
import { Illustration } from '../ui/Illustration';
import { AgreementCheckbox } from '../ui/AgreementCheckbox';
import { PrimaryButton } from '../ui/PrimaryButton';
import { SupportFooter } from '../ui/SupportFooter';
import { AgreementModal } from '../ui/AgreementModal';

/**
 * P2Q 一键登录确认：本机号码认证。
 *
 * 取号（运营商 SDK）与换登录态是两步，本页负责串起来：
 *   1. 进入页面即取号（useCarrierPhone）→ 展示掩码号码；
 *   2. 点「一键登录」→ 用取号令牌换正式登录态 → 写登录态 → 把号码写回引导资料 → 进 P3。
 *
 * 原先这里读的是 `data.phone`（只有短信登录才会写），运营商通道的号码既没取也没存，
 * 所以永远显示占位「本机号码」；登录接口返回的 phone 也被直接丢掉。
 * 现在取号失败时不再假装号码还在：「一键登录」置灰，同时给出「重新获取」与「改用验证码登录」。
 */
export function P2QuickLogin() {
  const { data, setData, navigate, back } = useOnboarding();
  const { gate, modalProps } = useAgreementGate();
  const { carrierToken, maskedPhone, carrier, ready, loading: fetching, error: fetchError, refresh } =
    useCarrierPhone();
  const { loginByCarrier, loading: logging, error: loginError } = useLogin();
  /** 登录态写入：此前本页只跳 P3 不写 token */
  const { login: writeAuth } = useAuth();

  const agreed = data.agreed;
  const carrierName = CARRIER_LABEL[carrier];
  /** 取号失败：号码与令牌都没有，本页只能提供重试或改走验证码登录 */
  const failed = !fetching && !ready;
  const busy = fetching || logging;

  /** 一键登录：用取号令牌换登录态，成功后才进 P3 */
  const handleLogin = async () => {
    try {
      const result = await loginByCarrier(carrierToken);
      writeAuth(result.token);
      // 号码写回引导资料：后续步骤（P2P/P2R 预填、B3 联系人电话）都以这里为准
      setData({ phone: result.phone });
    } catch {
      // 失败原因由 useLogin 记录，页面下方展示
      return;
    }
    navigate('P3');
  };

  /** 运营商认证服务条款由运营商在认证页内提供，本仓库没有该文档，不冒充能打开它 */
  const showCarrierTerms = () => {
    Alert.alert(
      `${carrierName}认证服务条款`,
      `一键登录的认证服务由${carrierName}提供，服务条款以认证页展示的内容为准。`,
    );
  };

  return (
    <ScreenShell showBack onBack={back}>
      <ScrollView showsVerticalScrollIndicator={false} contentContainerStyle={styles.content}>
        <View style={styles.brandArea}>
          <Illustration name="logo" size={88} radius={22} />
        </View>

        {ready ? (
          <Text style={styles.phone}>{maskedPhone}</Text>
        ) : (
          <Text style={[styles.phonePending, failed && styles.phoneFailed]}>
            {failed ? '未能获取本机号码' : '正在获取本机号码…'}
          </Text>
        )}
        <Text style={styles.subtitle}>
          {failed ? '可重新获取，或改用验证码登录' : '首次验证通过即注册轻松聘账号'}
        </Text>

        <View style={styles.btnArea}>
          <PrimaryButton
            label="一键登录"
            active={ready && !busy}
            loading={logging}
            onPress={() => gate(handleLogin)}
          />

          {failed ? (
            <View style={styles.fallbackRow}>
              <Pressable style={styles.fallbackBtn} onPress={refresh} hitSlop={6}>
                <Text style={styles.fallbackText}>重新获取</Text>
              </Pressable>
              <Pressable
                style={styles.fallbackBtn}
                onPress={() => gate(() => navigate('P2'))}
                hitSlop={6}
              >
                <Text style={styles.fallbackText}>改用验证码登录</Text>
              </Pressable>
            </View>
          ) : null}
        </View>

        {loginError ? <Text style={styles.formError}>{loginError.message}</Text> : null}
        {fetchError && !loginError ? (
          <Text style={styles.formError}>{fetchError.message}</Text>
        ) : null}

        <View style={styles.agree}>
          <AgreementCheckbox
            checked={agreed}
            onToggle={() => setData({ agreed: !agreed })}
            text={
              <Text style={styles.agreeText}>
                已阅读并同意
                <Text style={styles.link} onPress={showCarrierTerms}>
                  《{carrierName}认证服务条款》
                </Text>
                、
                <Text style={styles.link} onPress={() => navigate('B2')}>《轻松聘用户协议》</Text>
                和
                <Text style={styles.link} onPress={() => navigate('B2')}>《隐私政策》</Text>
                ，允许轻松聘统一管理本人账号信息
              </Text>
            }
          />
        </View>
      </ScrollView>

      <View style={styles.footer}>
        <SupportFooter />
        <Text style={styles.carrierNote}>认证服务由{carrierName}提供</Text>
      </View>

      <AgreementModal {...modalProps} />
    </ScreenShell>
  );
}

const styles = StyleSheet.create({
  content: { flexGrow: 1 },
  brandArea: { alignItems: 'center', marginTop: '16%' },
  phone: {
    textAlign: 'center',
    fontSize: 30,
    fontWeight: '800',
    color: colors.textPrimary,
    marginTop: 40,
  },
  phonePending: {
    textAlign: 'center',
    fontSize: 22,
    fontWeight: '700',
    color: colors.textHint,
    marginTop: 44,
  },
  phoneFailed: { fontSize: 18, color: colors.dangerText },
  subtitle: { textAlign: 'center', fontSize: 14, color: colors.textSecondary, marginTop: spacing.block },
  btnArea: { marginTop: 36 },
  fallbackRow: {
    flexDirection: 'row',
    justifyContent: 'center',
    gap: 24,
    marginTop: spacing.block,
  },
  fallbackBtn: { paddingVertical: 6, paddingHorizontal: 4 },
  fallbackText: { fontSize: 14, fontWeight: '600', color: colors.primaryText },
  formError: { marginTop: spacing.sm, textAlign: 'center', fontSize: 12, color: colors.danger },
  agree: { marginTop: 20 },
  agreeText: { fontSize: 12, color: colors.textSecondary, lineHeight: 18 },
  link: { color: colors.primary, fontWeight: '600' },
  footer: { paddingTop: 16, paddingBottom: 8 },
  carrierNote: { textAlign: 'center', fontSize: 12, color: colors.textHint, marginTop: spacing.block },
});