import { LinearGradient } from 'expo-linear-gradient';
import React, { useMemo } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';

import { Colors } from '@/constants/Colors';
import { buildMenstrualTimeline } from '@/utils/menstrualCycle';

type Props = {
  onPress?: () => void;
};

const RingIcon = () => (
  <View style={styles.iconWrapper}>
    <LinearGradient
      colors={['#f572a7', '#f0a4ff', '#6f6ced']}
      start={{ x: 0, y: 0 }}
      end={{ x: 1, y: 1 }}
      style={styles.iconGradient}
    >
      <View style={styles.iconInner} />
    </LinearGradient>
  </View>
);

export const MenstrualCycleCard: React.FC<Props> = ({ onPress }) => {
  const { todayInfo, periodLength } = useMemo(() => buildMenstrualTimeline(), []);

  const summary = useMemo(() => {
    if (!todayInfo) {
      return {
        state: '待记录',
        dayText: '点击记录本次经期',
        number: undefined,
      };
    }

    if (todayInfo.status === 'period' || todayInfo.status === 'predicted-period') {
      return {
        state: todayInfo.status === 'period' ? '经期' : '预测经期',
        dayText: '天',
        number: todayInfo.dayOfCycle ?? 1,
      };
    }

    if (todayInfo.status === 'ovulation-day') {
      return {
        state: '排卵日',
        dayText: '易孕窗口',
        number: undefined,
      };
    }

    return {
      state: '排卵期',
      dayText: `距离排卵日${Math.max(periodLength - 1, 1)}天`,
      number: undefined,
    };
  }, [periodLength, todayInfo]);

  return (
    <TouchableOpacity activeOpacity={0.92} onPress={onPress} style={styles.wrapper}>
      <View style={styles.headerRow}>
        <RingIcon />
        <Text style={styles.title}>生理周期</Text>
        <View style={styles.badgeOuter}>
          <View style={styles.badgeInner} />
        </View>
      </View>
      <View style={styles.content}>
        <Text style={styles.stateText}>{summary.state}</Text>
        <Text style={styles.dayRow}>
          {summary.number !== undefined ? (
            <>
              第 <Text style={styles.dayNumber}>{summary.number}</Text> {summary.dayText}
            </>
          ) : (
            summary.dayText
          )}
        </Text>
      </View>
    </TouchableOpacity>
  );
};

const styles = StyleSheet.create({
  wrapper: {
    width: '100%',
  },
  headerRow: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 10,
  },
  iconWrapper: {
    width: 24,
    height: 24,
    borderRadius: 12,
    alignItems: 'center',
    justifyContent: 'center',
  },
  iconGradient: {
    width: 22,
    height: 22,
    borderRadius: 11,
    alignItems: 'center',
    justifyContent: 'center',
  },
  iconInner: {
    width: 10,
    height: 10,
    borderRadius: 5,
    backgroundColor: '#fff',
  },
  title: {
    fontSize: 14,
    color: '#192126',
    fontWeight: '600',
    flex: 1,
    fontFamily: 'AliBold',
  },
  badgeOuter: {
    width: 18,
    height: 18,
    borderRadius: 9,
    borderWidth: 2,
    borderColor: '#fbcfe8',
    alignItems: 'center',
    justifyContent: 'center',
  },
  badgeInner: {
    width: 6,
    height: 6,
    borderRadius: 3,
    backgroundColor: Colors.light.primary,
    opacity: 0.35,
  },
  content: {
    marginTop: 12,
  },
  stateText: {
    fontSize: 12,
    color: '#515558',
    marginBottom: 4,
    fontFamily: 'AliRegular',
  },
  dayRow: {
    fontSize: 14,
    color: '#192126',
    fontFamily: 'AliRegular',
  },
  dayNumber: {
    fontSize: 18,
    fontWeight: '700',
    color: '#192126',
    fontFamily: 'AliBold',
  },
});