import React, { useState } from 'react';
import { View, Text, TouchableOpacity, ScrollView, StyleSheet, Modal } from 'react-native';
import { useThemeContext } from './ThemeProvider';
import { useTranslation } from '../src/i18n';
import { borderRadius } from '../constants/theme';

interface CookieBannerProps {
  onConsent: (consents: { essential: boolean; analytics: boolean; preferences: boolean; health_data: boolean }) => void;
  onPrivacyPress: () => void;
}

export default function CookieBanner({ onConsent, onPrivacyPress }: CookieBannerProps) {
  const { colors } = useThemeContext();
  const { t } = useTranslation();
  const [categories, setCategories] = useState({ analytics: false, preferences: false, health_data: false });

  const toggleCategory = (cat: keyof typeof categories) => {
    setCategories(prev => ({ ...prev, [cat]: !prev[cat] }));
  };

  const categoryKeys = ['analytics', 'preferences', 'health_data'] as const;

  return (
    <Modal transparent animationType="slide" visible>
      <View style={styles.overlay}>
        <View style={[styles.container, { backgroundColor: colors.card }]}>
          <ScrollView showsVerticalScrollIndicator={false}>
            <Text style={[styles.title, { color: colors.text }]}>{t('cookie_banner.title')}</Text>
            <Text style={[styles.desc, { color: colors.textSecondary }]}>{t('cookie_banner.description')}</Text>
            <View style={styles.categories}>
              <View style={[styles.category, { backgroundColor: colors.background }]}>
                <View style={styles.categoryInfo}>
                  <Text style={[styles.categoryName, { color: colors.text }]}>{t('cookie_banner.category.essential')}</Text>
                  <Text style={[styles.categoryDesc, { color: colors.textSecondary }]}>{t('cookie_banner.category.essential_desc')}</Text>
                </View>
                <View style={[styles.toggle, styles.toggleLocked, { backgroundColor: colors.primary }]}>
                  <Text style={styles.toggleLabel}>ON</Text>
                </View>
              </View>
              {categoryKeys.map(cat => (
                <View key={cat} style={[styles.category, { backgroundColor: colors.background }]}>
                  <View style={styles.categoryInfo}>
                    <Text style={[styles.categoryName, { color: colors.text }]}>{t(`cookie_banner.category.${cat}`)}</Text>
                    <Text style={[styles.categoryDesc, { color: colors.textSecondary }]}>{t(`cookie_banner.category.${cat}_desc`)}</Text>
                  </View>
                  <TouchableOpacity style={[styles.toggle, categories[cat] && { backgroundColor: colors.primary }]} onPress={() => toggleCategory(cat)} activeOpacity={0.7}>
                    <View style={[styles.toggleThumb, categories[cat] && styles.toggleThumbOn]} />
                  </TouchableOpacity>
                </View>
              ))}
            </View>
            <View style={styles.actions}>
              <TouchableOpacity style={[styles.btn, { backgroundColor: colors.primary }]} onPress={() => onConsent({ essential: true, analytics: true, preferences: true, health_data: true })}>
                <Text style={[styles.btnText, { color: colors.background }]}>{t('cookie_banner.accept_all')}</Text>
              </TouchableOpacity>
              <TouchableOpacity style={[styles.btn, { backgroundColor: colors.background, borderColor: colors.border, borderWidth: 1 }]} onPress={() => onConsent({ essential: true, analytics: false, preferences: false, health_data: false })}>
                <Text style={[styles.btnText, { color: colors.text }]}>{t('cookie_banner.reject_optional')}</Text>
              </TouchableOpacity>
              <TouchableOpacity style={[styles.btn, { borderColor: colors.primary, borderWidth: 1 }]} onPress={() => onConsent({ essential: true, ...categories })}>
                <Text style={[styles.btnText, { color: colors.primary }]}>{t('cookie_banner.save')}</Text>
              </TouchableOpacity>
            </View>
            <TouchableOpacity onPress={onPrivacyPress}>
              <Text style={[styles.moreInfo, { color: colors.textSecondary }]}>{t('cookie_banner.more_info')} →</Text>
            </TouchableOpacity>
          </ScrollView>
        </View>
      </View>
    </Modal>
  );
}

const styles = StyleSheet.create({
  overlay: { flex: 1, backgroundColor: 'rgba(0,0,0,0.5)', justifyContent: 'flex-end' },
  container: { borderTopLeftRadius: borderRadius.lg, borderTopRightRadius: borderRadius.lg, padding: 20, maxHeight: '85%' },
  title: { fontSize: 18, fontWeight: '700', marginBottom: 8 },
  desc: { fontSize: 14, lineHeight: 20, marginBottom: 16 },
  categories: { gap: 10, marginBottom: 16 },
  category: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', padding: 12, borderRadius: borderRadius.md, gap: 12 },
  categoryInfo: { flex: 1, gap: 2 },
  categoryName: { fontSize: 14, fontWeight: '600' },
  categoryDesc: { fontSize: 12, lineHeight: 16 },
  toggle: { width: 44, height: 24, borderRadius: 12, backgroundColor: '#ccc', justifyContent: 'center', alignItems: 'center', padding: 2 },
  toggleLocked: { opacity: 0.6 },
  toggleLabel: { fontSize: 9, fontWeight: '700', color: 'white' },
  toggleThumb: { width: 20, height: 20, borderRadius: 10, backgroundColor: 'white', alignSelf: 'flex-start' },
  toggleThumbOn: { alignSelf: 'flex-end' },
  actions: { gap: 8, marginBottom: 12 },
  btn: { paddingVertical: 12, borderRadius: 999, alignItems: 'center' },
  btnText: { fontSize: 14, fontWeight: '600' },
  moreInfo: { textAlign: 'center', fontSize: 12, textDecorationLine: 'underline' },
});