/*
 * SCR-M15 [모바일] 내 티켓 지갑 — 관람객(B2C) 트랙.
 * 필터 탭(진행중·예정·지난) + 티켓 카드 리스트 + QR 풀스크린 뷰어.
 * 배지 전환 안내 배너 + 오프라인 표시 배지. 사용됨/취소 카드 흐리게.
 * ※ M10(티켓)·M9(환불) 백엔드 미구현 → 샘플 데이터("샘플" 배지). API 호출 없음.
 */
import { Ionicons } from '@expo/vector-icons';
import { router, Stack } from 'expo-router';
import React, { useMemo, useState } from 'react';
import { Alert, Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import { Banner } from '../../components/Banner';
import { QrViewerModal } from '../../components/tickets/QrViewerModal';
import { TicketCard } from '../../components/tickets/TicketCard';
import {
  FILTER_TABS,
  SAMPLE_TICKETS,
  type SampleTicket,
  type TicketFilter,
} from '../../components/tickets/sampleTickets';
import { colors, radius, spacing, type } from '../../theme';

export default function TicketWalletScreen() {
  const [filter, setFilter] = useState<TicketFilter>('active');
  const [qrOpen, setQrOpen] = useState(false);
  const [qrIndex, setQrIndex] = useState(0);

  const filtered = useMemo(
    () => SAMPLE_TICKETS.filter((t) => t.filter === filter),
    [filter],
  );

  // QR 뷰어 대상 = 현재 필터 내 사용가능 티켓만(스와이프 전환 범위)
  const usableInView = useMemo(
    () => filtered.filter((t) => t.status === 'usable'),
    [filtered],
  );

  function openQr(t: SampleTicket) {
    const i = usableInView.findIndex((x) => x.id === t.id);
    setQrIndex(i < 0 ? 0 : i);
    setQrOpen(true);
  }

  function openDetail(t: SampleTicket) {
    // SCR-P8(예매 확인·취소) 미구현 → 안내만(샘플)
    Alert.alert(
      '예매 상세·취소',
      `${t.eventName}\n예매번호 ${t.bookingNoMasked}\n\n예매 확인·취소 화면(SCR-P8)은 티켓 백엔드(M10) 연동 후 제공됩니다.`,
    );
  }

  return (
    <View style={styles.flex}>
      <Stack.Screen options={{ title: '내 티켓', headerTitleAlign: 'center' }} />

      <ScrollView contentContainerStyle={styles.scroll}>
        {/* 오프라인 표시 배지 */}
        <View style={styles.offlineWrap}>
          <View style={styles.offlineBadge}>
            <View style={styles.offlineDot} />
            <Text style={styles.offlineText}>오프라인 — 저장된 티켓 표시 중</Text>
          </View>
        </View>

        {/* 필터 탭(세그먼트) */}
        <View style={styles.segment}>
          {FILTER_TABS.map((tab) => {
            const on = filter === tab.key;
            return (
              <Pressable
                key={tab.key}
                accessibilityRole="tab"
                accessibilityState={{ selected: on }}
                style={[styles.segBtn, on && styles.segBtnOn]}
                onPress={() => setFilter(tab.key)}
              >
                <Text style={[styles.segText, on && styles.segTextOn]}>{tab.label}</Text>
              </Pressable>
            );
          })}
        </View>

        {/* 배지 전환 안내 배너 */}
        <Banner tone="info">
          티켓 QR로 현장 체크인하면 모바일 배지로 전환됩니다
        </Banner>

        {/* 티켓 리스트 / 빈 상태 */}
        {filtered.length === 0 ? (
          <EmptyState />
        ) : (
          filtered.map((t) => (
            <TicketCard key={t.id} ticket={t} onOpenQr={openQr} onDetail={openDetail} />
          ))
        )}

        <Text style={styles.footNote}>
          표시된 티켓은 샘플입니다 — 티켓 백엔드(M10) 연동 시 실데이터로 대체됩니다.
        </Text>
      </ScrollView>

      <QrViewerModal
        visible={qrOpen}
        tickets={usableInView}
        index={qrIndex}
        onChangeIndex={setQrIndex}
        onClose={() => setQrOpen(false)}
      />
    </View>
  );
}

function EmptyState() {
  return (
    <View style={styles.empty}>
      <Ionicons name="ticket-outline" size={44} color={colors.neutral200} />
      <Text style={styles.emptyTitle}>보유한 티켓이 없습니다</Text>
      <Text style={styles.emptyBody}>입장권을 예매하면 이곳에 티켓이 표시됩니다.</Text>
      <Pressable
        accessibilityRole="button"
        style={styles.emptyBtn}
        onPress={() => router.push('/tickets/select')}
      >
        <Text style={styles.emptyBtnText}>입장권 예매</Text>
      </Pressable>
    </View>
  );
}

const styles = StyleSheet.create({
  flex: { flex: 1, backgroundColor: colors.neutral050 },
  scroll: { padding: spacing.md, gap: spacing.md, paddingBottom: 40 },
  offlineWrap: { alignItems: 'center' },
  offlineBadge: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
    backgroundColor: colors.white,
    borderWidth: 1,
    borderColor: colors.neutral200,
    borderRadius: radius.pill,
    paddingHorizontal: 12,
    paddingVertical: 5,
  },
  offlineDot: { width: 6, height: 6, borderRadius: 3, backgroundColor: colors.primary600 },
  offlineText: { fontSize: 11, color: colors.neutral500, fontWeight: '500' },
  segment: {
    flexDirection: 'row',
    backgroundColor: colors.white,
    borderWidth: 1,
    borderColor: colors.neutral200,
    borderRadius: radius.md,
    padding: 4,
    gap: 4,
  },
  segBtn: {
    flex: 1,
    minHeight: 40,
    alignItems: 'center',
    justifyContent: 'center',
    borderRadius: radius.sm,
  },
  segBtnOn: { backgroundColor: colors.primary050 },
  segText: { fontSize: type.body.fontSize, fontWeight: '600', color: colors.neutral500 },
  segTextOn: { color: colors.primary700 },
  footNote: { textAlign: 'center', fontSize: 11, color: colors.neutral500, marginTop: 4 },
  empty: {
    alignItems: 'center',
    gap: 8,
    paddingVertical: spacing.xl,
    backgroundColor: colors.white,
    borderWidth: 1,
    borderColor: colors.neutral200,
    borderRadius: radius.md,
  },
  emptyTitle: { fontSize: type.h3.fontSize, fontWeight: '700', color: colors.neutral900 },
  emptyBody: { fontSize: type.caption.fontSize, color: colors.neutral500, textAlign: 'center' },
  emptyBtn: {
    marginTop: 8,
    minHeight: 48,
    paddingHorizontal: 24,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: colors.primary600,
    borderRadius: radius.sm,
  },
  emptyBtnText: { color: colors.white, fontSize: type.h3.fontSize, fontWeight: '700' },
});