import { HeaderBar } from '@/components/ui/HeaderBar';
import { Ionicons } from '@expo/vector-icons';
import React, { useMemo } from 'react';
import { useTranslation } from 'react-i18next';
import { Linking, ScrollView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

type CardConfig = {
  key: string;
  icon: React.ComponentProps<typeof Ionicons>['name'];
  color: string;
  title: string;
  items: string[];
};

export default function HealthDataPermissionsScreen() {
  const { t } = useTranslation();
  const insets = useSafeAreaInsets();

  const cards = useMemo<CardConfig[]>(() => ([
    {
      key: 'usage',
      icon: 'pulse-outline',
      color: '#34D399',
      title: t('healthPermissions.cards.usage.title'),
      items: t('healthPermissions.cards.usage.items', { returnObjects: true }) as string[],
    },
    {
      key: 'purpose',
      icon: 'bulb-outline',
      color: '#FBBF24',
      title: t('healthPermissions.cards.purpose.title'),
      items: t('healthPermissions.cards.purpose.items', { returnObjects: true }) as string[],
    },
    {
      key: 'control',
      icon: 'shield-checkmark-outline',
      color: '#60A5FA',
      title: t('healthPermissions.cards.control.title'),
      items: t('healthPermissions.cards.control.items', { returnObjects: true }) as string[],
    },
    {
      key: 'privacy',
      icon: 'lock-closed-outline',
      color: '#A78BFA',
      title: t('healthPermissions.cards.privacy.title'),
      items: t('healthPermissions.cards.privacy.items', { returnObjects: true }) as string[],
    },
  ]), [t]);

  const calloutItems = useMemo(() => (
    t('healthPermissions.callout.items', { returnObjects: true }) as string[]
  ), [t]);

  const contactDescription = t('healthPermissions.contact.description');
  const contactEmail = t('healthPermissions.contact.email');

  const handleContactPress = () => {
    if (!contactEmail) return;
    void Linking.openURL(`mailto:${contactEmail}`);
  };

  const contentTopPadding = insets.top + 72;

  return (
    <View style={styles.container}>
      <HeaderBar
        title={t('healthPermissions.title')}
        variant="elevated"
        transparent={true}
      />
      <ScrollView
        style={styles.scrollView}
        contentContainerStyle={{
          paddingTop: contentTopPadding,
          paddingBottom: insets.bottom + 32,
          paddingHorizontal: 20,
        }}
        showsVerticalScrollIndicator={false}
      >
        <View style={styles.heroCard}>
          <Text style={styles.heroTitle}>{t('healthPermissions.title')}</Text>
          <Text style={styles.heroSubtitle}>{t('healthPermissions.subtitle')}</Text>
        </View>

        {cards.map((card) => (
          <View key={card.key} style={styles.infoCard}>
            <View style={styles.cardHeader}>
              <View style={[styles.cardIcon, { backgroundColor: `${card.color}22` }]}>
                <Ionicons name={card.icon} size={20} color={card.color} />
              </View>
              <Text style={styles.cardTitle}>{card.title}</Text>
            </View>
            {card.items.map((item, index) => (
              <View key={`${card.key}-${index}`} style={styles.cardItemRow}>
                <View style={styles.bullet} />
                <Text style={styles.cardItemText}>{item}</Text>
              </View>
            ))}
          </View>
        ))}

        <View style={styles.calloutCard}>
          <View style={styles.cardHeader}>
            <View style={[styles.cardIcon, { backgroundColor: '#F472B622' }]}>
              <Ionicons name="alert-circle-outline" size={20} color="#F472B6" />
            </View>
            <Text style={styles.cardTitle}>{t('healthPermissions.callout.title')}</Text>
          </View>
          {calloutItems.map((item, index) => (
            <View key={`callout-${index}`} style={styles.cardItemRow}>
              <View style={styles.bullet} />
              <Text style={styles.cardItemText}>{item}</Text>
            </View>
          ))}
        </View>

        <View style={styles.contactCard}>
          <Text style={styles.contactTitle}>{t('healthPermissions.contact.title')}</Text>
          <Text style={styles.contactDescription}>{contactDescription}</Text>
          {contactEmail ? (
            <TouchableOpacity style={styles.contactButton} onPress={handleContactPress} activeOpacity={0.85}>
              <Ionicons name="mail-outline" size={18} color="#fff" />
              <Text style={styles.contactButtonText}>{contactEmail}</Text>
            </TouchableOpacity>
          ) : null}
        </View>
      </ScrollView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#F9FAFB',
  },
  scrollView: {
    flex: 1,
  },
  heroCard: {
    backgroundColor: '#fff',
    borderRadius: 20,
    padding: 20,
    marginBottom: 16,
    shadowColor: '#000',
    shadowOpacity: 0.05,
    shadowRadius: 10,
    shadowOffset: { width: 0, height: 8 },
    elevation: 2,
  },
  heroTitle: {
    fontSize: 24,
    fontWeight: '700',
    color: '#111827',
    marginBottom: 12,
  },
  heroSubtitle: {
    fontSize: 16,
    color: '#4B5563',
    lineHeight: 22,
  },
  infoCard: {
    backgroundColor: '#fff',
    borderRadius: 18,
    padding: 18,
    marginBottom: 14,
    borderWidth: 1,
    borderColor: '#F3F4F6',
  },
  cardHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 12,
  },
  cardIcon: {
    width: 36,
    height: 36,
    borderRadius: 18,
    alignItems: 'center',
    justifyContent: 'center',
    marginRight: 10,
  },
  cardTitle: {
    fontSize: 16,
    fontWeight: '600',
    color: '#111827',
  },
  cardItemRow: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    marginBottom: 8,
  },
  bullet: {
    width: 6,
    height: 6,
    borderRadius: 3,
    backgroundColor: '#9370DB',
    marginTop: 8,
    marginRight: 10,
  },
  cardItemText: {
    flex: 1,
    fontSize: 14,
    color: '#374151',
    lineHeight: 20,
  },
  calloutCard: {
    backgroundColor: '#FEF3F2',
    borderRadius: 18,
    padding: 18,
    marginBottom: 14,
    borderWidth: 1,
    borderColor: '#FECACA',
  },
  contactCard: {
    backgroundColor: '#fff',
    borderRadius: 18,
    padding: 18,
    borderWidth: 1,
    borderColor: '#F3F4F6',
  },
  contactTitle: {
    fontSize: 16,
    fontWeight: '600',
    color: '#111827',
    marginBottom: 8,
  },
  contactDescription: {
    fontSize: 14,
    color: '#4B5563',
    lineHeight: 20,
    marginBottom: 12,
  },
  contactButton: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: '#111827',
    paddingHorizontal: 16,
    paddingVertical: 12,
    borderRadius: 12,
  },
  contactButtonText: {
    marginLeft: 8,
    color: '#fff',
    fontWeight: '600',
  },
});