import React from 'react';
import { useNavigate } from 'react-router-dom';
import { useTranslation } from 'react-i18next';
import { Check, ChevronRight, ShieldCheck, ShoppingBag } from 'lucide-react';
import { YStack, XStack } from '@tamagui/stacks';
import { SizableText as Text } from '@tamagui/text';
import { Checkbox } from '@tamagui/checkbox';
import toast from 'react-hot-toast';

import { MobileShell } from './components/MobileShell';
import { MobileCard, CTAButton, PillBadge, SkeletonCard } from './components/Primitives';
import { useAdminTheme } from './theme';
import { getPackages, createTenantPaddleCheckout, Package } from '../api';
import { getApiErrorMessage } from '../lib/apiError';
import { useQuery } from '@tanstack/react-query';

export default function MobilePackageShopPage() {
  const { t } = useTranslation('management');
  const navigate = useNavigate();
  const { textStrong, muted, border, primary, surface, accentSoft } = useAdminTheme();
  const [selectedPackage, setSelectedPackage] = React.useState<Package | null>(null);

  const { data: packages, isLoading } = useQuery({
    queryKey: ['packages', 'endcustomer'],
    queryFn: () => getPackages('endcustomer'),
  });

  if (isLoading) {
    return (
      <MobileShell title={t('shop.title', 'Upgrade Package')} showBack>
        <YStack space="$3">
          <SkeletonCard height={150} />
          <SkeletonCard height={150} />
        </YStack>
      </MobileShell>
    );
  }

  if (selectedPackage) {
    return (
      <CheckoutConfirmation
        pkg={selectedPackage}
        onCancel={() => setSelectedPackage(null)}
      />
    );
  }

  return (
    <MobileShell title={t('shop.title', 'Upgrade Package')} showBack>
      <YStack space="$4">
        <YStack paddingHorizontal="$2">
          <Text fontSize="$sm" color={muted}>
            {t('shop.subtitle', 'Choose a package to unlock more features and limits.')}
          </Text>
        </YStack>

        <YStack space="$3">
          {packages?.map((pkg) => (
            <PackageShopCard
              key={pkg.id}
              pkg={pkg}
              onSelect={() => setSelectedPackage(pkg)}
            />
          ))}
        </YStack>
      </YStack>
    </MobileShell>
  );
}

function PackageShopCard({ pkg, onSelect }: { pkg: Package; onSelect: () => void }) {
  const { textStrong, muted, border, primary, accentSoft } = useAdminTheme();
  const { t } = useTranslation('management');

  // Parse features if they are stored as JSON strings or objects
  // The API type says Record<string, boolean>, but let's be safe
  const features = pkg.features; 

  return (
    <MobileCard
      onPress={onSelect}
      borderColor={border}
      space="$3"
      pressStyle={{ backgroundColor: accentSoft }}
    >
      <XStack justifyContent="space-between" alignItems="center">
        <YStack>
          <Text fontSize="$lg" fontWeight="800" color={textStrong}>
            {pkg.name}
          </Text>
          <Text fontSize="$md" color={primary} fontWeight="700">
            {new Intl.NumberFormat(undefined, { style: 'currency', currency: 'EUR' }).format(pkg.price)}
          </Text>
        </YStack>
        <ChevronRight size={20} color={muted} />
      </XStack>

      <YStack space="$1.5">
        {pkg.max_photos ? (
            <FeatureRow label={t('shop.limits.photos', '{{count}} Photos', { count: pkg.max_photos })} />
        ) : (
            <FeatureRow label={t('shop.limits.unlimitedPhotos', 'Unlimited Photos')} />
        )}
        {pkg.gallery_days ? (
            <FeatureRow label={t('shop.limits.days', '{{count}} Days Gallery', { count: pkg.gallery_days })} />
        ) : null}
      </YStack>
      
      <CTAButton label={t('shop.select', 'Select')} onPress={onSelect} tone="primary" />
    </MobileCard>
  );
}

function FeatureRow({ label }: { label: string }) {
    const { textStrong, primary } = useAdminTheme();
    return (
        <XStack alignItems="center" space="$2">
            <Check size={14} color={primary} />
            <Text fontSize="$sm" color={textStrong}>{label}</Text>
        </XStack>
    )
}

function CheckoutConfirmation({ pkg, onCancel }: { pkg: Package; onCancel: () => void }) {
  const { t } = useTranslation('management');
  const { textStrong, muted, border, primary, danger } = useAdminTheme();
  const [agbAccepted, setAgbAccepted] = React.useState(false);
  const [withdrawalAccepted, setWithdrawalAccepted] = React.useState(false);
  const [busy, setBusy] = React.useState(false);

  const canProceed = agbAccepted && withdrawalAccepted;

  const handleCheckout = async () => {
    if (!canProceed || busy) return;
    setBusy(true);
    try {
        const { checkout_url } = await createTenantPaddleCheckout(pkg.id, {
            success_url: window.location.href,
            return_url: window.location.href,
        });
        window.location.href = checkout_url;
    } catch (err) {
        toast.error(getApiErrorMessage(err, t('shop.errors.checkout', 'Checkout failed')));
        setBusy(false);
    }
  };

  return (
    <MobileShell title={t('shop.confirmTitle', 'Confirm Purchase')} onBack={onCancel}>
      <YStack space="$4">
        <MobileCard space="$2" borderColor={border}>
            <Text fontSize="$sm" color={muted}>{t('shop.confirmSubtitle', 'You are upgrading to:')}</Text>
            <Text fontSize="$xl" fontWeight="800" color={textStrong}>{pkg.name}</Text>
            <Text fontSize="$lg" color={primary} fontWeight="700">
                {new Intl.NumberFormat(undefined, { style: 'currency', currency: 'EUR' }).format(pkg.price)}
            </Text>
        </MobileCard>

        <MobileCard space="$3" borderColor={border}>
            <XStack alignItems="center" space="$2">
                <ShieldCheck size={18} color={textStrong} />
                <Text fontSize="$md" fontWeight="700" color={textStrong}>{t('shop.legalTitle', 'Terms & Conditions')}</Text>
            </XStack>

            <XStack space="$3" alignItems="flex-start">
                <Checkbox 
                    id="agb" 
                    size="$4" 
                    checked={agbAccepted} 
                    onCheckedChange={(checked) => setAgbAccepted(!!checked)}
                >
                    <Checkbox.Indicator>
                        <Check />
                    </Checkbox.Indicator>
                </Checkbox>
                <Text fontSize="$sm" color={textStrong} flex={1} onPress={() => setAgbAccepted(!agbAccepted)}>
                    {t('shop.legal.agb', 'I agree to the Terms and Conditions and Privacy Policy.')}
                </Text>
            </XStack>

            <XStack space="$3" alignItems="flex-start">
                <Checkbox 
                    id="withdrawal" 
                    size="$4" 
                    checked={withdrawalAccepted} 
                    onCheckedChange={(checked) => setWithdrawalAccepted(!!checked)}
                >
                    <Checkbox.Indicator>
                        <Check />
                    </Checkbox.Indicator>
                </Checkbox>
                <Text fontSize="$sm" color={textStrong} flex={1} onPress={() => setWithdrawalAccepted(!withdrawalAccepted)}>
                    {t('shop.legal.withdrawal', 'I agree that the contract execution begins immediately and I lose my right of withdrawal.')}
                </Text>
            </XStack>
        </MobileCard>

        <YStack space="$2">
            <CTAButton 
                label={busy ? t('shop.processing', 'Processing...') : t('shop.payNow', 'Pay Now')} 
                onPress={handleCheckout} 
                disabled={!canProceed || busy}
                tone="primary"
            />
            <CTAButton 
                label={t('common.cancel', 'Cancel')} 
                onPress={onCancel} 
                tone="ghost"
                disabled={busy}
            />
        </YStack>
      </YStack>
    </MobileShell>
  );
}