import { useState } from 'react';
import { Linking, Text, TouchableOpacity, View } from 'react-native';
import { useTranslation } from 'react-i18next';
import { Ionicons } from '@expo/vector-icons';
import { useColors } from '../../../lib/theme';
import { OnboardingShell } from '../OnboardingShell';
import { LyraBubble } from '../LyraBubble';
import { CTABar } from '../CTABar';

type Tier = 'pro' | 'legend';
type Billing = 'monthly' | 'yearly';

const HARDSHIP_EMAIL = 'support@rebreak.org';

export function PlanSlide({
  onChosen,
  current,
  total,
}: {
  onChosen: (tier: Tier, billing: Billing) => void;
  current: number;
  total: number;
}) {
  const { t } = useTranslation();
  const colors = useColors();
  const [tier, setTier] = useState<Tier>('pro');
  const [billing, setBilling] = useState<Billing>('yearly');

  function openHardshipMail() {
    const subject = encodeURIComponent('Härtefall — rebreak');
    Linking.openURL(`mailto:${HARDSHIP_EMAIL}?subject=${subject}`).catch(() => {});
  }

  return (
    <OnboardingShell
      current={current}
      total={total}
      cta={
        <CTABar
          primaryLabel={
            tier === 'pro'
              ? t('onboarding.plan.cta_trial')
              : t('onboarding.plan.cta_legend')
          }
          onPrimary={() => onChosen(tier, billing)}
        />
      }
    >
      <LyraBubble text={t('onboarding.lyra.plan.body')} emotion="happy" />

      <BillingToggle billing={billing} setBilling={setBilling} t={t} colors={colors} />

      <View style={{ marginTop: 14, gap: 12 }}>
        <PlanCard
          selected={tier === 'pro'}
          onSelect={() => setTier('pro')}
          colors={colors}
          badge={t('onboarding.plan.tier_pro_badge')}
          title="Pro"
          price={
            billing === 'yearly'
              ? t('onboarding.plan.tier_pro_price_yearly')
              : t('onboarding.plan.tier_pro_price_monthly')
          }
          anchorPrice={billing === 'yearly' ? t('onboarding.plan.tier_pro_anchor_yearly') : null}
          totalPrice={billing === 'yearly' ? t('onboarding.plan.tier_pro_total_yearly') : null}
          subline={
            billing === 'yearly'
              ? t('onboarding.plan.tier_pro_subline_yearly')
              : t('onboarding.plan.tier_pro_subline_monthly')
          }
          features={[
            t('onboarding.plan.feat_blocklist'),
            t('onboarding.plan.feat_lyra'),
            t('onboarding.plan.feat_mail'),
            t('onboarding.plan.feat_community'),
          ]}
        />
        <PlanCard
          selected={tier === 'legend'}
          onSelect={() => setTier('legend')}
          colors={colors}
          badge={null}
          title="Legend"
          price={
            billing === 'yearly'
              ? t('onboarding.plan.tier_legend_price_yearly')
              : t('onboarding.plan.tier_legend_price_monthly')
          }
          anchorPrice={billing === 'yearly' ? t('onboarding.plan.tier_legend_anchor_yearly') : null}
          totalPrice={billing === 'yearly' ? t('onboarding.plan.tier_legend_total_yearly') : null}
          subline={
            billing === 'yearly'
              ? t('onboarding.plan.tier_legend_subline_yearly')
              : t('onboarding.plan.tier_legend_subline_monthly')
          }
          features={[
            t('onboarding.plan.feat_legend_all_pro'),
            t('onboarding.plan.feat_legend_multi_device'),
            t('onboarding.plan.feat_legend_voice'),
          ]}
        />
      </View>

      <Text
        style={{
          marginTop: 16,
          fontFamily: 'Nunito_400Regular',
          fontSize: 12,
          lineHeight: 18,
          color: colors.textMuted,
          textAlign: 'center',
        }}
      >
        {t('onboarding.plan.disclaimer')}
      </Text>

      {/* Härtefall-Mailto — manuell, kein Auto-Sozial-Rabatt (Strategist-Verdict) */}
      <TouchableOpacity
        onPress={openHardshipMail}
        activeOpacity={0.7}
        style={{ marginTop: 8, paddingVertical: 6, alignSelf: 'center' }}
      >
        <Text
          style={{
            fontFamily: 'Nunito_600SemiBold',
            fontSize: 12,
            color: colors.brandOrange,
            textDecorationLine: 'underline',
          }}
        >
          {t('onboarding.plan.hardship_link')}
        </Text>
      </TouchableOpacity>
    </OnboardingShell>
  );
}

// ─── Billing-Toggle ──────────────────────────────────────────────────────────

function BillingToggle({
  billing,
  setBilling,
  t,
  colors,
}: {
  billing: Billing;
  setBilling: (b: Billing) => void;
  t: ReturnType<typeof useTranslation>['t'];
  colors: import('../../../lib/theme').ColorScheme;
}) {
  return (
    <View
      style={{
        marginTop: 22,
        backgroundColor: colors.surfaceElevated,
        borderRadius: 12,
        padding: 4,
        flexDirection: 'row',
        gap: 4,
      }}
    >
      <ToggleButton
        active={billing === 'monthly'}
        onPress={() => setBilling('monthly')}
        label={t('onboarding.plan.billing_monthly')}
        colors={colors}
      />
      <ToggleButton
        active={billing === 'yearly'}
        onPress={() => setBilling('yearly')}
        label={t('onboarding.plan.billing_yearly')}
        savingsBadge={t('onboarding.plan.billing_savings')}
        colors={colors}
      />
    </View>
  );
}

function ToggleButton({
  active,
  onPress,
  label,
  savingsBadge,
  colors,
}: {
  active: boolean;
  onPress: () => void;
  label: string;
  savingsBadge?: string;
  colors: import('../../../lib/theme').ColorScheme;
}) {
  return (
    <TouchableOpacity
      onPress={onPress}
      activeOpacity={0.85}
      style={{
        flex: 1,
        paddingVertical: 10,
        borderRadius: 9,
        backgroundColor: active ? colors.bg : 'transparent',
        alignItems: 'center',
        gap: 2,
      }}
    >
      <Text
        style={{
          fontFamily: 'Nunito_700Bold',
          fontSize: 14,
          color: active ? colors.text : colors.textMuted,
        }}
      >
        {label}
      </Text>
      {savingsBadge ? (
        <Text
          style={{
            fontFamily: 'Nunito_600SemiBold',
            fontSize: 10,
            letterSpacing: 0.3,
            color: active ? colors.success : colors.textMuted,
          }}
        >
          {savingsBadge}
        </Text>
      ) : null}
    </TouchableOpacity>
  );
}

// ─── Plan-Card ───────────────────────────────────────────────────────────────

function PlanCard({
  selected,
  onSelect,
  colors,
  badge,
  title,
  price,
  anchorPrice,
  totalPrice,
  subline,
  features,
}: {
  selected: boolean;
  onSelect: () => void;
  colors: import('../../../lib/theme').ColorScheme;
  badge: string | null;
  title: string;
  /** Hauptpreis (z.B. "3,99 € / Monat" oder "3,33 € / Monat"). */
  price: string;
  /** Durchgestrichener Original-Annual-Preis (z.B. "47,88 €"). Nur bei Yearly. */
  anchorPrice: string | null;
  /** Total-Annual-Preis als Zusatzzeile (z.B. "39,90 € / Jahr"). Nur bei Yearly. */
  totalPrice: string | null;
  subline: string;
  features: string[];
}) {
  return (
    <TouchableOpacity
      onPress={onSelect}
      activeOpacity={0.85}
      style={{
        backgroundColor: colors.surface,
        borderRadius: 16,
        padding: 16,
        borderWidth: 2,
        borderColor: selected ? colors.brandOrange : colors.border,
        gap: 8,
      }}
    >
      <View style={{ flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' }}>
        <View style={{ flexDirection: 'row', alignItems: 'center', gap: 8 }}>
          <Text style={{ fontFamily: 'Nunito_800ExtraBold', fontSize: 22, color: colors.text }}>
            {title}
          </Text>
          {badge ? (
            <View
              style={{
                paddingHorizontal: 8,
                paddingVertical: 3,
                borderRadius: 6,
                backgroundColor: colors.brandOrange,
              }}
            >
              <Text style={{ fontFamily: 'Nunito_700Bold', fontSize: 10, color: '#ffffff', letterSpacing: 0.6 }}>
                {badge.toUpperCase()}
              </Text>
            </View>
          ) : null}
        </View>
        <View
          style={{
            width: 22,
            height: 22,
            borderRadius: 11,
            borderWidth: 2,
            borderColor: selected ? colors.brandOrange : colors.border,
            backgroundColor: selected ? colors.brandOrange : 'transparent',
            alignItems: 'center',
            justifyContent: 'center',
          }}
        >
          {selected ? <Ionicons name="checkmark" size={14} color="#ffffff" /> : null}
        </View>
      </View>

      <View style={{ flexDirection: 'row', alignItems: 'baseline', gap: 10 }}>
        <Text style={{ fontFamily: 'Nunito_700Bold', fontSize: 15, color: colors.text }}>
          {price}
        </Text>
        {anchorPrice ? (
          <Text
            style={{
              fontFamily: 'Nunito_400Regular',
              fontSize: 13,
              color: colors.textMuted,
              textDecorationLine: 'line-through',
            }}
          >
            {anchorPrice}
          </Text>
        ) : null}
      </View>
      {totalPrice ? (
        <Text style={{ fontFamily: 'Nunito_400Regular', fontSize: 12, color: colors.textMuted }}>
          {totalPrice}
        </Text>
      ) : null}
      <Text style={{ fontFamily: 'Nunito_400Regular', fontSize: 12, color: colors.textMuted }}>
        {subline}
      </Text>

      <View style={{ marginTop: 4, gap: 6 }}>
        {features.map((f) => (
          <View key={f} style={{ flexDirection: 'row', alignItems: 'center', gap: 8 }}>
            <Ionicons name="checkmark-circle" size={14} color={colors.success} />
            <Text style={{ flex: 1, fontFamily: 'Nunito_400Regular', fontSize: 13, color: colors.text }}>
              {f}
            </Text>
          </View>
        ))}
      </View>
    </TouchableOpacity>
  );
}