<?php

namespace App\Http\Controllers\Mini;

use App\Http\Controllers\Controller;
use App\Models\QrCode;
use App\Models\QrWallet;
use App\Services\Qr\QrCodeManagerService;
use App\Services\Qr\QrImageGeneratorService;
use App\Services\Qr\QrPdfExporter;
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 PaymentQrController 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()
            ->where('type', QrCode::TYPE_PAYMENT)
            ->latest()
            ->get();

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

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

        return view('mini.payment-qrs.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(): View
    {
        return view('mini.payment-qrs.create');
    }

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

        $data = $request->validate([
            'label' => 'required|string|max:120',
            'business_name' => 'required|string|max:120',
            'branch_label' => 'nullable|string|max:80',
        ]);

        $data['type'] = QrCode::TYPE_PAYMENT;
        $data['currency'] = 'GHS';

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

        return redirect()->route('mini.payment-qrs.show', $qrCode)->with('success', 'Payment QR created.');
    }

    public function show(QrCode $paymentQr): View
    {
        $this->authorizePaymentQr($paymentQr);

        $previewDataUri = $this->imageGenerator->previewDataUri($paymentQr);

        return view('mini.payment-qrs.show', [
            'qrCode' => $paymentQr->fresh(),
            'previewDataUri' => $previewDataUri,
        ]);
    }

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

        $data = $request->validate([
            'label' => 'sometimes|string|max:120',
            'business_name' => 'sometimes|string|max:120',
            'branch_label' => 'nullable|string|max:80',
            'is_active' => 'sometimes|boolean',
        ]);

        $data['is_active'] = $request->boolean('is_active', $paymentQr->is_active);

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

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

    public function destroy(QrCode $paymentQr): RedirectResponse
    {
        $this->authorizePaymentQr($paymentQr);

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

        return redirect()
            ->route('mini.payment-qrs.index')
            ->with('success', 'Payment QR deleted.');
    }

    public function preview(QrCode $paymentQr): Response
    {
        $this->authorizePaymentQr($paymentQr);

        $qrCode = $this->imageGenerator->ensureValidImages($paymentQr);
        $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 $paymentQr, string $format): StreamedResponse
    {
        $this->authorizePaymentQr($paymentQr);

        $qrCode = $this->imageGenerator->ensureValidImages($paymentQr);
        $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);
            $filename = Str::slug($qrCode->label).'-qr.pdf';

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

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

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

    private function authorizePaymentQr(QrCode $paymentQr): void
    {
        abort_unless($paymentQr->type === QrCode::TYPE_PAYMENT, 404);
        abort_unless($paymentQr->user_id === ladill_account()->id, 403);
    }
}