import { View, Text, TouchableOpacity, ScrollView, ActionSheetIOS, Platform, Alert } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import { Ionicons } from '@expo/vector-icons';
import { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { useColors } from '../../lib/theme';
import { FormSheet } from '../FormSheet';

type Props = {
  visible: boolean;
  onClose: () => void;
  /** User triggert "Atmen" → Deflector zur Urge-Page (Click-2 ende, kein Cooldown). */
  onBreathe: () => void;
  /** Click-3 Bestätigung — final destruktive Aktion via ActionSheet. */
  onStartCooldown: (reason: string) => Promise<void>;
};

/**
 * Click 2 of 3 (Cooldown-Friction).
 *
 * Erklärt was Cooldown bedeutet, bietet [Atmen] als primary Deflector an,
 * und ein kleines [Cooldown trotzdem starten] das einen nativen ActionSheet
 * zur finalen Bestätigung öffnet (Click 3).
 */
export function DeactivationExplainerSheet({
  visible,
  onClose,
  onBreathe,
  onStartCooldown,
}: Props) {
  const { t } = useTranslation();
  const colors = useColors();
  const insets = useSafeAreaInsets();
  const [submitting, setSubmitting] = useState(false);

  function showFinalConfirm() {
    if (Platform.OS === 'ios') {
      ActionSheetIOS.showActionSheetWithOptions(
        {
          title: t('blocker.deactivation_actionsheet_title'),
          message: t('blocker.deactivation_actionsheet_message'),
          options: [t('common.cancel'), t('blocker.deactivation_start_cta')],
          destructiveButtonIndex: 1,
          cancelButtonIndex: 0,
        },
        async (idx) => {
          if (idx === 1) await runCooldown();
        },
      );
    } else {
      // Android Fallback
      Alert.alert(
        t('blocker.deactivation_actionsheet_title'),
        t('blocker.deactivation_actionsheet_message'),
        [
          { text: t('common.cancel'), style: 'cancel' },
          { text: t('blocker.deactivation_start_cta'), style: 'destructive', onPress: runCooldown },
        ],
      );
    }
  }

  async function runCooldown() {
    setSubmitting(true);
    try {
      await onStartCooldown('user_requested_deactivation');
      onClose();
    } catch (e: any) {
      Alert.alert(t('common.error'), e?.message ?? t('blocker.deactivation_failed_msg'));
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <FormSheet
      visible={visible}
      onClose={onClose}
      title={t('blocker.deactivation_heading')}
      initialHeightPct={0.62}
      minHeightPct={0.3}
      safeAreaBottom={false}
    >
      <ScrollView
        style={{ flex: 1 }}
        contentContainerStyle={{ padding: 20, paddingBottom: Math.max(insets.bottom, 12) + 24, gap: 18 }}
      >
          <Text style={{ fontSize: 22, fontFamily: 'Nunito_800ExtraBold', color: colors.text }}>
            {t('blocker.deactivation_title')}
          </Text>
          <Text
            style={{
              fontSize: 15,
              fontFamily: 'Nunito_400Regular',
              color: colors.textMuted,
              lineHeight: 22,
            }}
          >
            {t('blocker.deactivation_intro')}
          </Text>

          {/* Was passiert */}
          <View style={{ gap: 12 }}>
            <BulletRow
              icon="time-outline"
              title={t('blocker.deactivation_bullet1_title')}
              text={t('blocker.deactivation_bullet1_text')}
            />
            <BulletRow
              icon="refresh-outline"
              title={t('blocker.deactivation_bullet2_title')}
              text={t('blocker.deactivation_bullet2_text')}
            />
            <BulletRow
              icon="leaf-outline"
              title={t('blocker.deactivation_bullet3_title')}
              text={t('blocker.deactivation_bullet3_text')}
            />
          </View>

          <View style={{ height: 12 }} />

          {/* Primary Deflector */}
          <TouchableOpacity
            onPress={onBreathe}
            activeOpacity={0.85}
          >
            <View style={{
              backgroundColor: '#16a34a',
              borderRadius: 14,
              paddingVertical: 16,
              paddingHorizontal: 16,
              flexDirection: 'row',
              alignItems: 'center',
              justifyContent: 'center',
              gap: 10,
            }}>
              <Ionicons name="leaf" size={18} color="#fff" />
              <Text style={{ fontSize: 15, fontFamily: 'Nunito_700Bold', color: '#fff' }}>
                {t('blocker.deactivation_breathe_cta')}
              </Text>
            </View>
          </TouchableOpacity>

          {/* Destructive secondary */}
          <TouchableOpacity
            onPress={showFinalConfirm}
            disabled={submitting}
            hitSlop={8}
            activeOpacity={0.5}
            style={{
              opacity: submitting ? 0.5 : 1,
              alignSelf: 'center',
              paddingVertical: 12,
            }}
          >
            <Text
              style={{
                fontSize: 13,
                fontFamily: 'Nunito_400Regular',
                color: '#dc2626',
              }}
            >
              {submitting ? t('blocker.deactivation_starting') : t('blocker.deactivation_start_anyway')}
            </Text>
          </TouchableOpacity>
      </ScrollView>
    </FormSheet>
  );
}

function BulletRow({
  icon,
  title,
  text,
}: {
  icon: React.ComponentProps<typeof Ionicons>['name'];
  title: string;
  text: string;
}) {
  const colors = useColors();
  return (
    <View style={{ flexDirection: 'row', gap: 12 }}>
      <View
        style={{
          width: 36,
          height: 36,
          borderRadius: 10,
          backgroundColor: colors.surfaceElevated,
          alignItems: 'center',
          justifyContent: 'center',
        }}
      >
        <Ionicons name={icon} size={18} color={colors.textMuted} />
      </View>
      <View style={{ flex: 1 }}>
        <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: colors.text }}>
          {title}
        </Text>
        <Text
          style={{
            fontSize: 12,
            fontFamily: 'Nunito_400Regular',
            color: colors.textMuted,
            marginTop: 2,
            lineHeight: 17,
          }}
        >
          {text}
        </Text>
      </View>
    </View>
  );
}
