import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useGameData } from '../src/hooks';
import { colors } from '../src/theme';
import type { GameLevel, GameLevelStatus, GameProgress } from '../src/types';

/** 关卡状态 → 样式配置 */
const LEVEL_STATUS_STYLE: Record<
  GameLevelStatus,
  { bg: string; border: string; icon: string; text: string }
> = {
  locked: {
    bg: colors.borderLight,
    border: colors.border,
    icon: colors.textHint,
    text: colors.textHint,
  },
  available: {
    bg: colors.primaryLight,
    border: colors.primaryBorder,
    icon: colors.primary,
    text: colors.primaryText,
  },
  completed: {
    bg: colors.successLight,
    border: colors.successBorder,
    icon: colors.success,
    text: colors.successText,
  },
};

/** 根据进度计算关卡状态 */
function getLevelStatus(level: GameLevel, progress: GameProgress | null): GameLevelStatus {
  if (!progress) return 'locked';
  if (progress.results.some((r) => r.levelId === level.id && r.completed)) return 'completed';
  if (progress.unlockedLevels.includes(level.id)) return 'available';
  return 'locked';
}

/* ===================== 子组件：顶部导航 ===================== */

function Header({ onBack }: { onBack: () => void }) {
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <Text style={styles.headerTitle}>求职通关</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：进度条 ===================== */

function ProgressBar({ percent }: { percent: number }) {
  return (
    <View style={styles.progressCard}>
      <View style={styles.progressHead}>
        <Text style={styles.progressLabel}>通关进度</Text>
        <Text style={styles.progressValue}>{percent}%</Text>
      </View>
      <View style={styles.progressTrack}>
        <View style={[styles.progressFill, { width: `${percent}%` }]} />
      </View>
    </View>
  );
}

/* ===================== 子组件：关卡卡片 ===================== */

function LevelCard({
  level,
  status,
  onPress,
}: {
  level: GameLevel;
  status: GameLevelStatus;
  onPress: () => void;
}) {
  const theme = LEVEL_STATUS_STYLE[status];
  const disabled = status === 'locked';
  return (
    <Pressable
      style={[styles.levelCard, { backgroundColor: theme.bg, borderColor: theme.border }]}
      onPress={onPress}
      disabled={disabled}
    >
      <View style={[styles.levelIconWrap, { backgroundColor: colors.white }]}>
        <Ionicons name={level.icon as any} size={22} color={theme.icon} />
      </View>
      <View style={styles.levelBody}>
        <Text style={[styles.levelOrder, { color: theme.text }]}>第 {level.order} 关</Text>
        <Text style={[styles.levelTitle, { color: colors.textPrimary }]}>{level.title}</Text>
        <Text style={[styles.levelSubtitle, { color: colors.textSecondary }]}>
          {level.subtitle}
        </Text>
      </View>
      <View style={styles.levelRight}>
        {status === 'completed' ? (
          <Ionicons name="checkmark-circle" size={26} color={colors.success} />
        ) : status === 'available' ? (
          <Ionicons name="chevron-forward" size={20} color={colors.primary} />
        ) : (
          <Ionicons name="lock-closed" size={20} color={colors.textHint} />
        )}
      </View>
    </Pressable>
  );
}

/* ===================== 页面 ===================== */

export default function GameScreen() {
  const router = useRouter();
  const { levels, progress, loading, error, refresh } = useGameData();

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />

      {loading ? (
        <View style={styles.stateBox}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      ) : error ? (
        <View style={styles.stateBox}>
          <Text style={styles.stateText}>加载失败，请重试</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      ) : levels.length === 0 ? (
        <View style={styles.stateBox}>
          <Ionicons name="extension-puzzle-outline" size={48} color={colors.textHint} />
          <Text style={styles.stateText}>暂无关卡数据</Text>
        </View>
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          <ProgressBar percent={progress?.totalPercent ?? 0} />

          <View style={styles.levelsSection}>
            {levels.map((level) => {
              const status = getLevelStatus(level, progress);
              return (
                <LevelCard
                  key={level.id}
                  level={level}
                  status={status}
                  onPress={() => router.push(`/game/level?id=${level.id}`)}
                />
              );
            })}
          </View>
        </ScrollView>
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 8,
    height: 48,
    backgroundColor: colors.white,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  headerBtn: {
    width: 40,
    height: 40,
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerTitle: {
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 8,
    paddingBottom: 24,
  },
  progressCard: {
    backgroundColor: colors.white,
    borderRadius: 8,
    padding: 16,
    marginBottom: 8,
  },
  progressHead: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginBottom: 10,
  },
  progressLabel: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  progressValue: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.primary,
  },
  progressTrack: {
    height: 8,
    borderRadius: 4,
    backgroundColor: colors.border,
  },
  progressFill: {
    height: 8,
    borderRadius: 4,
    backgroundColor: colors.primary,
  },
  levelsSection: {
    gap: 8,
  },
  levelCard: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: 14,
    borderRadius: 8,
    borderWidth: 1,
    backgroundColor: colors.white,
  },
  levelIconWrap: {
    width: 44,
    height: 44,
    borderRadius: 22,
    alignItems: 'center',
    justifyContent: 'center',
  },
  levelBody: {
    flex: 1,
    marginLeft: 12,
  },
  levelOrder: {
    fontSize: 12,
    fontWeight: '600',
    marginBottom: 2,
  },
  levelTitle: {
    fontSize: 16,
    fontWeight: '700',
  },
  levelSubtitle: {
    marginTop: 2,
    fontSize: 13,
  },
  levelRight: {
    width: 36,
    alignItems: 'center',
    justifyContent: 'center',
  },
  stateBox: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  stateText: {
    marginTop: 12,
    fontSize: 14,
    color: colors.textSecondary,
  },
  retryBtn: {
    marginTop: 16,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.white,
  },
});