import React from 'react';
import { View, Text, StyleSheet, TouchableOpacity } from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { theme } from '../theme';
import { Event } from '../types';
import { safeParseDate } from '../utils/recurrence';

interface EventCardProps {
  event: Event;
  onEdit: (event: Event) => void;
  onToggleComplete: (event: Event) => void;
  onDelete: (event: Event) => void;
}

const WEEKDAY_NAMES = ['周一', '周二', '周三', '周四', '周五', '周六', '周日'];

// 生成循环规则中文描述
const getRecurrenceLabel = (recurrence: string | null): string | null => {
  if (!recurrence) return null;
  const parts = recurrence.split(';');
  const type = parts[0];
  let interval = 1;
  let by: number[] = [];
  for (let i = 1; i < parts.length; i++) {
    const [key, val] = parts[i].split('=');
    if (key === 'interval') interval = parseInt(val) || 1;
    if (key === 'by') by = val.split(',').map(Number);
  }
  if (type === 'DAILY') {
    return interval === 1 ? '每天' : `每${interval}天`;
  }
  if (type === 'WEEKLY') {
    const prefix = interval === 1 ? '每周' : `每${interval}周`;
    if (by.length > 0) {
      return `${prefix} ${by.map(d => WEEKDAY_NAMES[d] || '').join('、')}`;
    }
    return prefix;
  }
  return null;
};

export default function EventCard({
  event,
  onEdit,
  onToggleComplete,
  onDelete,
}: EventCardProps) {
  const formatTime = (dateString: string) => {
    const date = safeParseDate(dateString);
    return date.toLocaleTimeString('zh-CN', {
      hour: '2-digit',
      minute: '2-digit',
    });
  };

  const recurrenceLabel = getRecurrenceLabel(event.recurrence);

  return (
    <TouchableOpacity
      style={[styles.container, event.completed && styles.completedContainer]}
      onPress={() => onEdit(event)}
      activeOpacity={0.7}
    >
      <TouchableOpacity
        style={styles.checkbox}
        onPress={() => onToggleComplete(event)}
      >
        {event.completed ? (
          <Ionicons name="checkmark-circle" size={28} color={theme.colors.primary} />
        ) : (
          <View style={styles.checkboxEmpty} />
        )}
      </TouchableOpacity>

      <View style={styles.content}>
        <Text
          style={[
            styles.title,
            event.completed && styles.completedText,
          ]}
          numberOfLines={2}
        >
          {event.title}
        </Text>
        {event.content ? (
          <Text
            style={[
              styles.contentText,
              event.completed && styles.completedText,
            ]}
            numberOfLines={2}
          >
            {event.content}
          </Text>
        ) : null}
        <View style={styles.timeContainer}>
          <Ionicons
            name="time-outline"
            size={16}
            color={theme.colors.textSecondary}
          />
          <Text style={styles.timeText}>{formatTime(event.start)}</Text>
          {recurrenceLabel && (
            <>
              <Ionicons
                name="repeat-outline"
                size={14}
                color={theme.colors.primary}
                style={{ marginLeft: 8 }}
              />
              <Text style={styles.recurrenceText}>{recurrenceLabel}</Text>
            </>
          )}
        </View>
      </View>

      <TouchableOpacity
        style={styles.deleteButton}
        onPress={() => onDelete(event)}
      >
        <Ionicons name="trash-outline" size={20} color={theme.colors.error} />
      </TouchableOpacity>
    </TouchableOpacity>
  );
}

const styles = StyleSheet.create({
  container: {
    flexDirection: 'row',
    backgroundColor: theme.colors.surface,
    borderRadius: theme.borderRadius.lg,
    padding: theme.spacing.md,
    marginBottom: theme.spacing.sm,
    alignItems: 'center',
    borderWidth: 1,
    borderColor: theme.colors.surfaceVariant,
  },
  completedContainer: {
    opacity: 0.6,
  },
  checkbox: {
    marginRight: theme.spacing.sm,
  },
  checkboxEmpty: {
    width: 28,
    height: 28,
    borderRadius: 14,
    borderWidth: 2,
    borderColor: theme.colors.textSecondary,
  },
  content: {
    flex: 1,
  },
  title: {
    ...theme.typography.h3,
    color: theme.colors.text,
    marginBottom: theme.spacing.xs,
  },
  contentText: {
    ...theme.typography.bodySmall,
    color: theme.colors.textSecondary,
    marginBottom: theme.spacing.xs,
  },
  completedText: {
    textDecorationLine: 'line-through',
  },
  timeContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: theme.spacing.xs,
  },
  timeText: {
    ...theme.typography.caption,
    color: theme.colors.textSecondary,
  },
  recurrenceText: {
    ...theme.typography.caption,
    color: theme.colors.primary,
  },
  deleteButton: {
    padding: theme.spacing.sm,
  },
});