<?php

namespace App\Http\Controllers\Merchant;

use App\Http\Controllers\Controller;
use App\Models\QrCode;
use App\Models\QrWallet;
use App\Services\Crm\CrmClient;
use App\Services\Qr\QrCodeManagerService;
use App\Services\Qr\QrImageGeneratorService;
use App\Services\Qr\QrPdfExporter;
use App\Support\Qr\QrTypeCatalog;
use App\Support\CrmPrefillCodec;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\View\View;
use RuntimeException;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;

class StorefrontController extends Controller
{
    public function __construct(
        private QrCodeManagerService $manager,
        private QrImageGeneratorService $imageGenerator,
        private QrPdfExporter $pdfExporter,
    ) {}

    public function index(Request $request): View
    {
        $account = ladill_account();
        $qrCodes = $account->qrCodes()
            ->whereIn('type', \App\Support\Qr\QrTypeCatalog::storefrontTypes())
            ->latest()
            ->get();

        $previewDataUris = $qrCodes->mapWithKeys(function (QrCode $qr) {
            return [$qr->id => $this->imageGenerator->previewDataUri($qr)];
        });

        $wallet = $this->manager->walletFor($account);

        return view('merchant.storefronts.index', [
            'qrCodes' => $qrCodes,
            'previewDataUris' => $previewDataUris,
            'wallet' => $wallet,
            'activeCount' => $qrCodes->where('is_active', true)->count(),
            'pricePerQr' => QrWallet::pricePerQr(),
            'topupUrl' => 'https://'.config('app.account_domain').'/wallet',
        ]);
    }

    public function create(Request $request): View
    {
        $requestedType = (string) $request->query('type', QrCode::TYPE_SHOP);
        if (! QrTypeCatalog::isValid($requestedType)) {
            $requestedType = QrCode::TYPE_SHOP;
        }

        $prefill = CrmPrefillCodec::decode($request->query('prefill'));
        if (($prefill['kind'] ?? null) === 'merchant_storefront' && ! empty($prefill['type'])) {
            $requestedType = (string) $prefill['type'];
        }

        return view('merchant.storefronts.create', [
            'requestedType' => $requestedType,
            'prefill' => ($prefill['kind'] ?? null) === 'merchant_storefront' ? $prefill : null,
            'catalog' => $this->catalogProducts(),
        ]);
    }

    /**
     * Active products from the merchant's Ladill CRM catalog, shaped for the
     * storefront editor's "add from catalog" picker. Resilient: returns [] if
     * CRM is unreachable so the form still works.
     *
     * @return array<int,array{name:string,price:string,currency:string,description:string}>
     */
    private function catalogProducts(): array
    {
        try {
            $response = CrmClient::for((string) ladill_account()->public_id)
                ->products(['type' => 'product', 'active' => 1, 'per_page' => 200]);
        } catch (\Throwable) {
            return [];
        }

        return collect($response['data'] ?? [])
            ->map(fn ($p) => [
                'name' => (string) ($p['name'] ?? ''),
                'price' => number_format(((int) ($p['unit_price_minor'] ?? 0)) / 100, 2, '.', ''),
                'currency' => strtoupper((string) ($p['currency'] ?? 'GHS')),
                'description' => (string) ($p['description'] ?? ''),
            ])
            ->filter(fn ($p) => $p['name'] !== '')
            ->values()
            ->all();
    }

    public function store(Request $request): RedirectResponse
    {
        $account = ladill_account();

        $request->validate([
            'label' => ['required', 'string', 'max:120'],
            'type' => ['required', 'in:'.implode(',', QrTypeCatalog::storefrontTypes())],
            'menu_logo' => ['nullable', 'image', 'mimes:jpeg,jpg,png,gif,webp', 'max:4096'],
            'menu_cover' => ['nullable', 'image', 'mimes:jpeg,jpg,png,gif,webp', 'max:8192'],
            'item_images' => ['nullable', 'array'],
            'item_images.*' => ['array'],
            'item_images.*.*' => ['mimes:jpeg,jpg,png,gif,webp', 'max:4096'],
        ]);

        $data = array_merge($request->all(), [
            'menu_logo' => $request->file('menu_logo'),
            'menu_cover' => $request->file('menu_cover'),
        ]);

        try {
            $qrCode = $this->manager->create($account, $data);
        } catch (RuntimeException $e) {
            return back()->withInput()->with('error', $e->getMessage());
        }

        return redirect()->route('merchant.storefronts.show', $qrCode)
            ->with('success', QrTypeCatalog::label($qrCode->type).' storefront created.');
    }

    public function show(QrCode $storefront): View
    {
        $this->authorizeStorefront($storefront);

        return view('merchant.storefronts.show', [
            'qrCode' => $storefront->fresh(),
            'previewDataUri' => $this->imageGenerator->previewDataUri($storefront),
            'catalog' => $this->catalogProducts(),
            'customDomains' => \App\Models\CustomDomain::where('qr_code_id', $storefront->id)->get(),
            'customDomainsEnabled' => app(\App\Services\CustomDomain\CustomDomainService::class)->enabled(),
            'customDomainServerIp' => config('customdomain.server_ip'),
        ]);
    }

    public function update(Request $request, QrCode $storefront): RedirectResponse
    {
        $this->authorizeStorefront($storefront);

        $request->validate([
            'label' => ['sometimes', 'string', 'max:120'],
            'is_active' => ['sometimes', 'boolean'],
            'menu_logo' => ['nullable', 'image', 'mimes:jpeg,jpg,png,gif,webp', 'max:4096'],
            'menu_cover' => ['nullable', 'image', 'mimes:jpeg,jpg,png,gif,webp', 'max:8192'],
            'item_images' => ['nullable', 'array'],
            'item_images.*' => ['array'],
            'item_images.*.*' => ['mimes:jpeg,jpg,png,gif,webp', 'max:4096'],
        ]);

        $data = array_merge($request->all(), [
            'is_active' => $request->boolean('is_active', $storefront->is_active),
            'menu_logo' => $request->file('menu_logo'),
            'menu_cover' => $request->file('menu_cover'),
        ]);

        try {
            $this->manager->update($storefront, $data);
        } catch (RuntimeException $e) {
            return back()->withInput()->with('error', $e->getMessage());
        }

        return back()->with('success', 'Storefront updated.');
    }

    public function destroy(QrCode $storefront): RedirectResponse
    {
        $this->authorizeStorefront($storefront);

        $this->manager->delete($storefront);

        return redirect()
            ->route('merchant.storefronts.index')
            ->with('success', 'Storefront deleted.');
    }

    public function preview(QrCode $storefront): Response
    {
        $this->authorizeStorefront($storefront);

        $qrCode = $this->imageGenerator->ensureValidImages($storefront);
        $bytes = $this->imageGenerator->normalizeStoredPng($qrCode->png_path);

        if ($bytes === null) {
            $bytes = $this->imageGenerator->renderPng($qrCode->encodedPayload(), $qrCode->style());
            $this->imageGenerator->generateAndStore($qrCode);
        }

        return response($bytes, 200, [
            'Content-Type' => 'image/png',
            'Cache-Control' => 'private, max-age=3600',
        ]);
    }

    public function download(QrCode $storefront, string $format): StreamedResponse
    {
        $this->authorizeStorefront($storefront);

        $qrCode = $this->imageGenerator->ensureValidImages($storefront);
        $path = $format === 'svg' ? $qrCode->svg_path : $qrCode->png_path;
        $filename = Str::slug($qrCode->label).'-qr.'.($format === 'svg' ? 'svg' : 'png');

        if ($format === 'png') {
            $bytes = $this->imageGenerator->normalizeStoredPng($path);
            if ($bytes === null) {
                $bytes = $this->imageGenerator->renderPng($qrCode->encodedPayload(), $qrCode->style());
                $this->imageGenerator->generateAndStore($qrCode);
            }

            return response()->streamDownload(fn () => print($bytes), $filename, [
                'Content-Type' => 'image/png',
            ]);
        }

        if ($format === 'pdf') {
            $bytes = $this->imageGenerator->normalizeStoredPng($qrCode->png_path);
            if ($bytes === null) {
                $bytes = $this->imageGenerator->renderPng($qrCode->encodedPayload(), $qrCode->style());
                $this->imageGenerator->generateAndStore($qrCode);
            }

            $pdf = $this->pdfExporter->fromPng($bytes, $qrCode->label);

            return response()->streamDownload(fn () => print($pdf), Str::slug($qrCode->label).'-qr.pdf', [
                'Content-Type' => 'application/pdf',
            ]);
        }

        abort_unless($path && Storage::disk('qr')->exists($path), 404);

        return Storage::disk('qr')->download($path, $filename);
    }

    private function authorizeStorefront(QrCode $storefront): void
    {
        abort_unless(in_array($storefront->type, \App\Support\Qr\QrTypeCatalog::storefrontTypes(), true), 404);
        abort_unless($storefront->user_id === ladill_account()->id, 403);
    }
}