import { useI18n } from '@/hooks/useI18n';
import type { RankingItem } from '@/store/challengesSlice';
import { Ionicons } from '@expo/vector-icons';
import { Image } from 'expo-image';
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';

type ChallengeRankingItemProps = {
  item: RankingItem;
  index: number;
  showDivider?: boolean;
  unit?: string;
};

const formatNumber = (value: number): string => {
  if (Number.isInteger(value)) {
    return value.toString();
  }
  return value.toFixed(2).replace(/0+$/, '').replace(/\.$/, '');
};

export function ChallengeRankingItem({ item, index, showDivider = false, unit }: ChallengeRankingItemProps) {
  const { t } = useI18n();

  const formatMinutes = (value: number): string => {
    const safeValue = Math.max(0, Math.round(value));
    const hours = safeValue / 60;
    return `${hours.toFixed(1)} ${t('challengeDetail.ranking.hour')}`;
  };

  const formatValueWithUnit = (value: number | undefined, unit?: string): string | undefined => {
    if (typeof value !== 'number' || Number.isNaN(value)) {
      return undefined;
    }
    if (unit === 'min') {
      return formatMinutes(value);
    }
    const formatted = formatNumber(value);
    return unit ? `${formatted} ${unit}` : formatted;
  };

  const reportedLabel = formatValueWithUnit(item.todayReportedValue, unit);
  const targetLabel = formatValueWithUnit(item.todayTargetValue, unit);
  const progressLabel = reportedLabel && targetLabel
    ? `${t('challengeDetail.ranking.today')} ${reportedLabel} / ${targetLabel}`
    : reportedLabel
      ? `${t('challengeDetail.ranking.today')} ${reportedLabel}`
      : targetLabel
        ? `${t('challengeDetail.ranking.todayGoal')} ${targetLabel}`
        : undefined;

  return (
    <View style={[styles.rankingRow, showDivider && styles.rankingRowDivider]}>
      <View style={styles.rankingOrderCircle}>
        <Text style={styles.rankingOrder}>{index + 1}</Text>
      </View>
      {item.avatar ? (
        <Image source={{ uri: item.avatar }} style={styles.rankingAvatar} cachePolicy="memory-disk" />
      ) : (
        <View style={styles.rankingAvatarPlaceholder}>
          <Ionicons name="person-outline" size={20} color="#6f7ba7" />
        </View>
      )}
      <View style={styles.rankingInfo}>
        <Text style={styles.rankingName} numberOfLines={1}>
          {item.name}
        </Text>
        <Text style={styles.rankingMetric}>{item.metric}</Text>
        {progressLabel ? (
          <Text style={styles.rankingProgress} numberOfLines={1}>
            {progressLabel}
          </Text>
        ) : null}
      </View>
      {item.badge ? <Text style={styles.rankingBadge}>{item.badge}</Text> : null}
    </View>
  );
}

const styles = StyleSheet.create({
  rankingRow: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: 12,
    paddingHorizontal: 18,
  },
  rankingRowDivider: {
    borderTopWidth: StyleSheet.hairlineWidth,
    borderTopColor: '#E5E7FF',
  },
  rankingOrderCircle: {
    width: 32,
    height: 32,
    borderRadius: 16,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#EEF0FF',
    marginRight: 12,
  },
  rankingOrder: {
    fontSize: 15,
    fontWeight: '700',
    color: '#4F5BD5',
  },
  rankingAvatar: {
    width: 44,
    height: 44,
    borderRadius: 22,
    marginRight: 14,
    backgroundColor: '#EEF0FF',
  },
  rankingAvatarPlaceholder: {
    width: 44,
    height: 44,
    borderRadius: 22,
    marginRight: 14,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#EEF0FF',
  },
  rankingInfo: {
    flex: 1,
  },
  rankingName: {
    fontSize: 15,
    fontWeight: '700',
    color: '#1c1f3a',
  },
  rankingMetric: {
    marginTop: 4,
    fontSize: 12,
    color: '#6f7ba7',
  },
  rankingProgress: {
    marginTop: 2,
    fontSize: 10,
    color: '#8a94c1',
  },
  rankingBadge: {
    fontSize: 12,
    color: '#A67CFF',
    fontWeight: '700',
  },
});