<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\EventPackageAddon;
use App\Models\PackagePurchase;
use App\Services\LemonSqueezy\Exceptions\LemonSqueezyException;
use App\Services\LemonSqueezy\LemonSqueezySubscriptionService;
use Dompdf\Dompdf;
use Dompdf\Options;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Str;
use Symfony\Component\HttpFoundation\Response;

class TenantBillingController extends Controller
{
    public function __construct(
        private readonly LemonSqueezySubscriptionService $subscriptions,
    ) {}

    public function transactions(Request $request): JsonResponse
    {
        $tenant = $request->attributes->get('tenant');

        if (! $tenant) {
            return response()->json([
                'data' => [],
                'message' => 'Tenant not found.',
            ], 404);
        }

        $perPage = max(1, min((int) $request->query('per_page', 25), 100));
        $page = max(1, (int) $request->query('page', 1));
        $locale = $request->user()?->preferred_locale ?? app()->getLocale();

        $paginator = PackagePurchase::query()
            ->where('tenant_id', $tenant->id)
            ->with(['package'])
            ->orderByDesc('purchased_at')
            ->orderByDesc('id')
            ->paginate($perPage, ['*'], 'page', $page);

        $data = $paginator->getCollection()->map(function (PackagePurchase $purchase) use ($locale) {
            $totals = $this->resolvePurchaseTotals($purchase);
            $transactionId = $purchase->provider_id ? (string) $purchase->provider_id : (string) $purchase->getKey();

            return [
                'id' => $purchase->getKey(),
                'status' => $purchase->refunded ? 'refunded' : 'completed',
                'amount' => $totals['total'],
                'currency' => $totals['currency'],
                'tax' => $totals['tax'],
                'provider' => $purchase->provider ?? 'paypal',
                'provider_id' => $transactionId,
                'package_name' => $this->resolvePackageName($purchase, $locale),
                'purchased_at' => $purchase->purchased_at?->toIso8601String(),
                'receipt_url' => route('api.v1.tenant.billing.transactions.receipt', [
                    'purchase' => $purchase->getKey(),
                ], absolute: false),
            ];
        })->values();

        return response()->json([
            'data' => $data,
            'meta' => [
                'current_page' => $paginator->currentPage(),
                'last_page' => $paginator->lastPage(),
                'per_page' => $paginator->perPage(),
                'total' => $paginator->total(),
            ],
        ]);
    }

    public function addons(Request $request): JsonResponse
    {
        $tenant = $request->attributes->get('tenant');

        if (! $tenant) {
            return response()->json([
                'data' => [],
                'message' => 'Tenant not found.',
            ], 404);
        }

        $perPage = max(1, min((int) $request->query('per_page', 25), 100));
        $page = max(1, (int) $request->query('page', 1));

        $paginator = EventPackageAddon::query()
            ->where('tenant_id', $tenant->id)
            ->with(['event:id,name,slug'])
            ->orderByDesc('purchased_at')
            ->orderByDesc('created_at')
            ->paginate($perPage, ['*'], 'page', $page);

        $data = $paginator->getCollection()->map(function (EventPackageAddon $addon) {
            return [
                'id' => $addon->id,
                'addon_key' => $addon->addon_key,
                'label' => $addon->metadata['label'] ?? null,
                'quantity' => (int) ($addon->quantity ?? 1),
                'status' => $addon->status,
                'amount' => $addon->amount !== null ? (float) $addon->amount : null,
                'currency' => $addon->currency,
                'extra_photos' => (int) $addon->extra_photos,
                'extra_guests' => (int) $addon->extra_guests,
                'extra_gallery_days' => (int) $addon->extra_gallery_days,
                'purchased_at' => $addon->purchased_at?->toIso8601String(),
                'receipt_url' => Arr::get($addon->receipt_payload, 'receipt_url'),
                'event' => $addon->event ? [
                    'id' => $addon->event->id,
                    'slug' => $addon->event->slug,
                    'name' => $addon->event->name,
                ] : null,
            ];
        })->values();

        return response()->json([
            'data' => $data,
            'meta' => [
                'current_page' => $paginator->currentPage(),
                'last_page' => $paginator->lastPage(),
                'per_page' => $paginator->perPage(),
                'total' => $paginator->total(),
            ],
        ]);
    }

    public function portal(Request $request): JsonResponse
    {
        $tenant = $request->attributes->get('tenant');

        if (! $tenant) {
            return response()->json([
                'message' => 'Tenant not found.',
            ], 404);
        }

        $subscriptionId = null;

        try {
            $subscriptionId = $tenant->getActiveResellerPackage()?->lemonsqueezy_subscription_id;
            if (! $subscriptionId) {
                return response()->json([
                    'message' => 'No active subscription found.',
                ], 404);
            }

            Log::debug('Fetching Lemon Squeezy subscription portal URL', [
                'tenant_id' => $tenant->id,
                'lemonsqueezy_subscription_id' => $subscriptionId,
            ]);

            $subscription = $this->subscriptions->retrieve($subscriptionId);
        } catch (\Throwable $exception) {
            $context = [
                'tenant_id' => $tenant->id,
                'lemonsqueezy_customer_id' => $tenant->lemonsqueezy_customer_id,
                'lemonsqueezy_subscription_id' => $subscriptionId ?? null,
                'error' => $exception->getMessage(),
            ];

            if ($exception instanceof LemonSqueezyException) {
                $context['lemonsqueezy_status'] = $exception->status();
                $context['lemonsqueezy_error'] = Arr::get($exception->context(), 'errors.0');
                $context['lemonsqueezy_errors'] = Arr::get($exception->context(), 'errors');
                $context['lemonsqueezy_request_id'] = Arr::get($exception->context(), 'meta.request_id');
            }

            Log::warning('Failed to fetch Lemon Squeezy subscription portal URL', [
                ...$context,
            ]);

            return response()->json([
                'message' => 'Failed to fetch Lemon Squeezy subscription portal URL.',
            ], 502);
        }

        $url = $this->subscriptions->portalUrl($subscription)
            ?? $this->subscriptions->updatePaymentMethodUrl($subscription);

        if (! $url) {
            $sessionData = Arr::get($subscription, 'data');
            $sessionUrls = Arr::get($subscription, 'attributes.urls');

            Log::warning('Lemon Squeezy subscription missing portal URL', [
                'tenant_id' => $tenant->id,
                'lemonsqueezy_customer_id' => $tenant->lemonsqueezy_customer_id,
                'lemonsqueezy_subscription_id' => $subscriptionId ?? null,
                'subscription_keys' => array_keys($subscription),
                'session_data_keys' => is_array($sessionData) ? array_keys($sessionData) : null,
                'session_url_keys' => is_array($sessionUrls) ? array_keys($sessionUrls) : null,
            ]);

            return response()->json([
                'message' => 'Lemon Squeezy subscription missing portal URL.',
            ], 502);
        }

        return response()->json([
            'url' => $url,
        ]);
    }

    public function receipt(Request $request, PackagePurchase $purchase): Response
    {
        $tenant = $request->attributes->get('tenant');

        if (! $tenant || (int) $purchase->tenant_id !== (int) $tenant->id) {
            abort(404);
        }

        $purchase->loadMissing(['tenant.user', 'package']);

        $locale = $request->user()?->preferred_locale ?? app()->getLocale();
        app()->setLocale($locale);

        $totals = $this->resolvePurchaseTotals($purchase);
        $currency = $totals['currency'];
        $total = $totals['total'];
        $tax = $totals['tax'];

        $buyer = $purchase->tenant?->user;
        $buyerName = $buyer?->full_name ?? $buyer?->name ?? $buyer?->email ?? '';
        $buyerEmail = $buyer?->email ?? '';
        $buyerAddress = $buyer?->address ?? '';

        $packageName = $this->resolvePackageName($purchase, $locale);
        $packageTypeLabel = $this->resolvePackageTypeLabel($purchase->package?->type);
        $providerLabel = $this->resolveProviderLabel($purchase->provider);

        $purchaseDate = $this->formatDate($purchase->purchased_at, $locale);
        $amountFormatted = $this->formatCurrency($total, $currency, $locale);
        $taxFormatted = $tax !== null ? $this->formatCurrency($tax, $currency, $locale) : null;
        $totalFormatted = $amountFormatted;

        $html = view('billing.receipt', [
            'receiptNumber' => (string) $purchase->getKey(),
            'purchaseDate' => $purchaseDate,
            'packageName' => $packageName,
            'packageTypeLabel' => $packageTypeLabel,
            'providerLabel' => $providerLabel,
            'orderId' => $purchase->provider_id ?? $purchase->getKey(),
            'buyerName' => $buyerName,
            'buyerEmail' => $buyerEmail,
            'buyerAddress' => $buyerAddress,
            'amountFormatted' => $amountFormatted,
            'taxFormatted' => $taxFormatted,
            'totalFormatted' => $totalFormatted,
            'currency' => $currency,
            'companyName' => config('app.name', 'Fotospiel'),
            'companyEmail' => config('mail.from.address', 'info@fotospiel.app'),
        ])->render();

        $options = new Options;
        $options->set('isHtml5ParserEnabled', true);
        $options->set('isRemoteEnabled', true);
        $options->set('defaultFont', 'Helvetica');

        $dompdf = new Dompdf($options);
        $dompdf->setPaper('A4', 'portrait');
        $dompdf->loadHtml($html, 'UTF-8');
        $dompdf->render();

        $pdfBinary = $dompdf->output();
        $filenameStem = Str::slug($packageName ?: 'receipt');

        return response($pdfBinary)
            ->header('Content-Type', 'application/pdf')
            ->header('Content-Disposition', 'inline; filename="receipt-'.$filenameStem.'.pdf"');
    }

    /**
     * @return array{currency: string, total: float, tax: float|null}
     */
    private function resolvePurchaseTotals(PackagePurchase $purchase): array
    {
        $metadata = $purchase->metadata ?? [];
        $totals = $metadata['paypal_totals'] ?? $metadata['lemonsqueezy_totals'] ?? [];

        $currency = $totals['currency']
            ?? $metadata['currency']
            ?? $purchase->package?->currency
            ?? 'EUR';

        $total = array_key_exists('total', $totals)
            ? (float) $totals['total']
            : (float) $purchase->price;

        $tax = array_key_exists('tax', $totals) ? (float) $totals['tax'] : null;

        return [
            'currency' => strtoupper((string) $currency),
            'total' => round($total, 2),
            'tax' => $tax !== null ? round($tax, 2) : null,
        ];
    }

    private function resolvePackageName(PackagePurchase $purchase, string $locale): string
    {
        $package = $purchase->package;
        if (! $package) {
            return '';
        }

        $localized = $package->getNameForLocale($locale);

        return $localized ?: (string) $package->name;
    }

    private function resolveProviderLabel(?string $provider): string
    {
        $provider = $provider ?: 'paypal';
        $labelKey = 'emails.purchase.provider.'.$provider;
        $label = __($labelKey);

        if ($label === $labelKey) {
            return ucfirst($provider);
        }

        return $label;
    }

    private function resolvePackageTypeLabel(?string $type): string
    {
        $type = $type ?: 'endcustomer';
        $labelKey = 'emails.purchase.package_type.'.$type;
        $label = __($labelKey);

        if ($label === $labelKey) {
            return ucfirst($type);
        }

        return $label;
    }

    private function formatCurrency(float $amount, string $currency, string $locale): string
    {
        $formatter = class_exists(\NumberFormatter::class)
            ? new \NumberFormatter($this->mapLocale($locale), \NumberFormatter::CURRENCY)
            : null;

        if ($formatter) {
            $formatted = $formatter->formatCurrency($amount, $currency);
            if ($formatted !== false) {
                return $formatted;
            }
        }

        $symbol = match (strtoupper($currency)) {
            'EUR' => '€',
            'USD' => '$',
            default => strtoupper($currency).' ',
        };

        return $symbol.number_format($amount, 2, ',', '.');
    }

    private function formatDate(?\Carbon\CarbonInterface $date, string $locale): string
    {
        if (! $date) {
            return '';
        }

        $localized = $date->locale($locale);

        if (str_starts_with($locale, 'en')) {
            return $localized->translatedFormat('F j, Y');
        }

        return $localized->translatedFormat('d. F Y');
    }

    private function mapLocale(string $locale): string
    {
        $normalized = strtolower(str_replace('_', '-', $locale));

        return match (true) {
            str_starts_with($normalized, 'de') => 'de_DE',
            str_starts_with($normalized, 'en') => 'en_US',
            default => 'de_DE',
        };
    }
}