<?php

namespace App\Repositories;

use App\Libraries\InvoicePDF;
use App\Libraries\MyPDFMerger;
use App\Models\ShoppingOrder;
use App\Models\UserInvoice;
use App\Models\UserSalesVolume;
use App\Services\BusinessPlan\SalesPointsVolume;
use App\Services\Incentive\IncentiveTracker;
use App\Services\Invoice;
use App\Services\UserService;
use App\Services\Util;
use Storage;

class InvoiceRepository extends BaseRepository
{
    /** @var \App\Models\ShoppingOrder */
    protected $model;

    private $invoice_date;

    private $invoice_number;

    private $filename;

    private $dir;

    private $user_sales_volume;

    private $delivery_dir;

    private $delivery_filename;

    public function __construct(ShoppingOrder $model)
    {
        $this->model = $model;
    }

    public function create($request = [])
    {
        // Wrap entire invoice creation in transaction to ensure atomicity
        return \DB::transaction(function () use ($request) {
            // Get and increment invoice number atomically (includes its own lock)
            $number = Invoice::makeNextInvoiceNumber();

            if ($payt = $this->model->getLastShoppingPaymentTransaction()) {
                $invoice_date = $payt->created_at->format('d.m.Y');
            }
            $this->invoice_date = isset($request['invoice_date']) ? $request['invoice_date'] : $invoice_date;
            $invoice_send_mail = isset($request['invoice_send_mail']) && $request['invoice_send_mail'] ? true : false;
            $this->invoice_number = Invoice::createInvoiceNumber($number, $this->invoice_date);
            $this->dir = Invoice::getInvoiceStorageDir($this->invoice_date);
            $this->filename = Invoice::makeInvoiceFilename($this->invoice_number);
            $this->delivery_dir = Invoice::getDeliveryStorageDir($this->invoice_date);
            $this->delivery_filename = Invoice::makeDeliveryFilename($this->invoice_number);

            $this->makePDF();

            $user_invoice = UserInvoice::create([
                'shopping_order_id' => $this->model->id,
                'year' => \Carbon::parse($this->invoice_date)->format('Y'),
                'month' => \Carbon::parse($this->invoice_date)->format('m'),
                'date' => $this->invoice_date,
                'full_number' => $this->invoice_number,
                'number' => $number,
                'filename' => $this->filename,
                'dir' => $this->dir,
                'delivery_filename' => $this->delivery_filename,
                'delivery_dir' => $this->delivery_dir,
                'disk' => 'public',
                'status' => $this->model->getStatusByOrder(),
            ]);

            if ($invoice_send_mail) {
                Invoice::sendInvoiceMail($this->model, $user_invoice);
            }

            return $user_invoice;
        });
    }

    public function update($request = [])
    {
        if ($user_invoice = $this->model->user_invoice) {
            $number = $user_invoice->number;
            $this->invoice_date = isset($request['invoice_date']) ? $request['invoice_date'] : $user_invoice->date;
            $invoice_send_mail = isset($request['invoice_send_mail']) ? false : true;
            $this->invoice_number = Invoice::createInvoiceNumber($number, $this->invoice_date);
            $this->dir = Invoice::getInvoiceStorageDir($this->invoice_date);
            $this->filename = Invoice::makeInvoiceFilename($this->invoice_number);
            $this->delivery_dir = Invoice::getDeliveryStorageDir($this->invoice_date);
            $this->delivery_filename = Invoice::makeDeliveryFilename($this->invoice_number);

            $this->user_sales_volume = UserSalesVolume::where('user_invoice_id', $this->model->user_invoice->id)->first();
            $this->makePDF();

            $user_invoice->fill([
                'shopping_order_id' => $this->model->id,
                'year' => \Carbon::parse($this->invoice_date)->format('Y'),
                'month' => \Carbon::parse($this->invoice_date)->format('m'),
                'date' => $this->invoice_date,
                'full_number' => $this->invoice_number,
                'number' => $number,
                'filename' => $this->filename,
                'dir' => $this->dir,
                'delivery_filename' => $this->delivery_filename,
                'delivery_dir' => $this->delivery_dir,
                'disk' => 'public',
            ])->save();

            if ($invoice_send_mail) {
                Invoice::sendInvoiceMail($this->model, $user_invoice);
            }

            return $user_invoice;
        }

        return null;
    }

    /**
     * Erstellt die PDFs für Rechnung und Lieferschein.
     * Das deutsche Original wird immer erstellt (Finanzamt-Anforderung).
     * Bei anderer Kundensprache wird zusätzlich eine Kopie in der Kundensprache erstellt.
     */
    private function makePDF()
    {
        $data = [
            'shopping_order' => $this->model,
            'invoice_date' => $this->invoice_date,
            'invoice_number' => $this->invoice_number,
            'user_sales_volume' => $this->user_sales_volume,
        ];

        if ($this->model->auth_user_id) {
            UserService::checkUserTaxShippingCountry($this->model->auth_user, $this->model->country_id);
            $data = array_merge($data, UserService::getYardInfo());
        }

        if (! Storage::disk('public')->exists($this->dir)) {
            Storage::disk('public')->makeDirectory($this->dir);
        }
        if (! Storage::disk('public')->exists($this->delivery_dir)) {
            Storage::disk('public')->makeDirectory($this->delivery_dir);
        }

        // Kundensprache ermitteln
        $customerLocale = $this->model->shopping_user ? $this->model->shopping_user->getLocale() : 'de';
        $originalLocale = \App::getLocale();

        // 1. IMMER deutsches Original erstellen (Finanzamt-Anforderung)
        \App::setLocale('de');
        $this->createPDFFiles($data, 'de');

        // 2. Wenn Kundensprache != DE, Kopie in Kundensprache erstellen
        if ($customerLocale && $customerLocale !== 'de') {
            \App::setLocale($customerLocale);
            $this->createPDFFiles($data, $customerLocale);
        }

        // Locale zurücksetzen
        \App::setLocale($originalLocale);
    }

    /**
     * Erstellt die PDF-Dateien für eine bestimmte Sprache.
     */
    private function createPDFFiles(array $data, string $locale)
    {
        $path = Storage::disk('public')->path('');

        // Dateinamen für diese Sprache
        $invoiceFilename = Invoice::makeInvoiceFilenameLocale($this->invoice_number, $locale);
        $deliveryFilename = Invoice::makeDeliveryFilenameLocale($this->invoice_number, $locale);

        // Kopie-Flag: true wenn nicht Deutsch (das Original)
        $data['is_copy'] = ($locale !== 'de');

        // Template basierend auf Locale
        $template = $this->getTemplateForLocale($locale);

        // Rechnung erstellen
        $pdf_file = new InvoicePDF('pdf.invoice');
        $pdf_file->create($data, $invoiceFilename, 'save', $path.$this->dir);
        $pdfMerger = new MyPDFMerger;
        $pdfMerger->addPDF($path.$this->dir.$invoiceFilename);
        $file = $pdfMerger->myMerge('string', $invoiceFilename, $template);
        Storage::disk('public')->put($this->dir.$invoiceFilename, $file);

        // Lieferschein erstellen (außer bei Sammelbestellung)
        if (! $this->model->shopping_collect_order) {
            $pdf_file = new InvoicePDF('pdf.delivery');
            $pdf_file->create($data, $deliveryFilename, 'save', $path.$this->delivery_dir);
            $pdfMerger = new MyPDFMerger;
            $pdfMerger->addPDF($path.$this->delivery_dir.$deliveryFilename);
            $file = $pdfMerger->myMerge('string', $deliveryFilename, $template);
            Storage::disk('public')->put($this->delivery_dir.$deliveryFilename, $file);
        }
    }

    /**
     * Gibt das PDF-Template für die angegebene Locale zurück.
     * Verfügbare Templates werden aus config/localization.php geladen.
     */
    private function getTemplateForLocale(string $locale): string
    {
        $availableTemplates = config('localization.availableTemplates', ['de']);

        if (in_array($locale, $availableTemplates)) {
            return 'template_invoice_'.$locale;
        }

        return 'template_invoice_de';
    }

    public function userSalesVolume() {}

    public function createAndSalesVolume($request = [])
    {
        $this->user_sales_volume = SalesPointsVolume::User($this->model);
        if (! Util::isTestSystem(true)) { // rechnung erstellen nur in production
            $user_invoice = $this->create($request);
            $this->user_sales_volume->user_invoice_id = $user_invoice->id;
            $this->user_sales_volume->save();
        }

        // Incentive: Track sales volume points
        IncentiveTracker::trackSalesVolume($this->user_sales_volume);
    }

    /**
     * Erstellt eine Stornorechnung mit Punktekorrektur
     *
     * @param  array  $request
     * @return UserInvoice
     */
    public function createCancellation($request = [])
    {
        return \DB::transaction(function () use ($request) {
            $original_invoice = $this->model->user_invoice;

            if (! $original_invoice) {
                throw new \Exception('Keine Originalrechnung gefunden.');
            }

            // Nächste Rechnungsnummer für Storno holen
            $number = Invoice::makeNextInvoiceNumber();

            // Stornodatum
            $cancellation_date = isset($request['cancellation_date'])
                ? $request['cancellation_date']
                : now()->format('d.m.Y');

            $cancellation_send_mail = isset($request['cancellation_send_mail']) && $request['cancellation_send_mail'] ? true : false;

            // Rechnungsnummer erstellen
            $cancellation_number = Invoice::createInvoiceNumber($number, $cancellation_date);
            $cancellation_dir = Invoice::getInvoiceStorageDir($cancellation_date);
            $cancellation_filename = Invoice::makeCancellationFilename($cancellation_number);
            $cancellation_delivery_dir = Invoice::getDeliveryStorageDir($cancellation_date);
            $cancellation_delivery_filename = Invoice::makeCancellationDeliveryFilename($cancellation_number);

            // Stornorechnung PDF erstellen
            $this->makeCancellationPDF(
                $cancellation_date,
                $cancellation_number,
                $cancellation_dir,
                $cancellation_filename,
                $cancellation_delivery_dir,
                $cancellation_delivery_filename,
                $original_invoice
            );

            // Stornorechnung in DB speichern
            $cancellation_invoice = UserInvoice::create([
                'shopping_order_id' => $this->model->id,
                'year' => \Carbon::parse($cancellation_date)->format('Y'),
                'month' => \Carbon::parse($cancellation_date)->format('m'),
                'date' => $cancellation_date,
                'full_number' => $cancellation_number,
                'number' => $number,
                'filename' => $cancellation_filename,
                'dir' => $cancellation_dir,
                'delivery_filename' => $cancellation_delivery_filename,
                'delivery_dir' => $cancellation_delivery_dir,
                'disk' => 'public',
                'cancellation' => true,
                'status' => $original_invoice->status === 1 ? 11 : 12, // 11 = storniert B., 12 = storniert Shop
            ]);

            // Original-Rechnung als storniert markieren
            $original_invoice->cancellation = true;
            $original_invoice->cancellation_id = $cancellation_invoice->id;
            $original_invoice->cancellation_date = $cancellation_date;
            $original_invoice->save();

            // Bestellstatus auf "storniert" setzen
            $this->model->txaction = 'cancelled';
            // Versandstatus auf "storniert" (10) setzen, wenn noch nicht versendet
            if (in_array($this->model->shipped, [0, 1])) {
                $this->model->shipped = 10;
            }
            $this->model->save();

            \Log::info('Bestellstatus aktualisiert nach Storno', [
                'order_id' => $this->model->id,
                'txaction' => $this->model->txaction,
                'shipped' => $this->model->shipped,
            ]);

            // Punktekorrektur durchführen (nach Erstellung der Stornorechnung)
            $this->correctPointsForCancellation($original_invoice, $cancellation_invoice);

            // Optional: E-Mail versenden
            if ($cancellation_send_mail) {
                Invoice::sendInvoiceMail($this->model, $cancellation_invoice);
            }

            return $cancellation_invoice;
        });
    }

    /**
     * Erstellt die Storno-PDFs (Rechnung und Lieferschein)
     */
    private function makeCancellationPDF(
        $cancellation_date,
        $cancellation_number,
        $cancellation_dir,
        $cancellation_filename,
        $cancellation_delivery_dir,
        $cancellation_delivery_filename,
        $original_invoice
    ) {
        $data = [
            'shopping_order' => $this->model,
            'invoice_date' => $cancellation_date,
            'invoice_number' => $cancellation_number,
            'original_invoice' => $original_invoice,
            'is_cancellation' => true,
        ];

        if ($this->model->auth_user_id) {
            UserService::checkUserTaxShippingCountry($this->model->auth_user, $this->model->country_id);
            $data = array_merge($data, UserService::getYardInfo());
        }

        // Verzeichnisse erstellen
        if (! Storage::disk('public')->exists($cancellation_dir)) {
            Storage::disk('public')->makeDirectory($cancellation_dir);
        }
        if (! Storage::disk('public')->exists($cancellation_delivery_dir)) {
            Storage::disk('public')->makeDirectory($cancellation_delivery_dir);
        }

        // Kundensprache ermitteln
        $customerLocale = $this->model->shopping_user ? $this->model->shopping_user->getLocale() : 'de';
        $originalLocale = \App::getLocale();

        // Deutsches Original (Finanzamt-Anforderung)
        \App::setLocale('de');
        $this->createCancellationPDFFiles(
            $data,
            'de',
            $cancellation_number,
            $cancellation_dir,
            $cancellation_filename,
            $cancellation_delivery_dir,
            $cancellation_delivery_filename
        );

        // Lokalisierte Version wenn gewünscht
        if ($customerLocale && $customerLocale !== 'de') {
            \App::setLocale($customerLocale);
            $data['is_copy'] = true;
            $localizedFilename = str_replace('.pdf', '-'.$customerLocale.'.pdf', $cancellation_filename);
            $localizedDeliveryFilename = str_replace('.pdf', '-'.$customerLocale.'.pdf', $cancellation_delivery_filename);

            $this->createCancellationPDFFiles(
                $data,
                $customerLocale,
                $cancellation_number,
                $cancellation_dir,
                $localizedFilename,
                $cancellation_delivery_dir,
                $localizedDeliveryFilename
            );
        }

        \App::setLocale($originalLocale);
    }

    /**
     * Erstellt die PDF-Dateien für eine Stornorechnung in einer bestimmten Sprache
     */
    private function createCancellationPDFFiles(
        array $data,
        string $locale,
        string $cancellation_number,
        string $cancellation_dir,
        string $cancellation_filename,
        string $cancellation_delivery_dir,
        string $cancellation_delivery_filename
    ) {
        $path = Storage::disk('public')->path('');
        $template = $this->getTemplateForLocale($locale);

        // Stornorechnung erstellen
        $pdf_file = new InvoicePDF('pdf.cancellation');
        $pdf_file->create($data, $cancellation_filename, 'save', $path.$cancellation_dir);
        $pdfMerger = new MyPDFMerger;
        $pdfMerger->addPDF($path.$cancellation_dir.$cancellation_filename);
        $file = $pdfMerger->myMerge('string', $cancellation_filename, $template);
        Storage::disk('public')->put($cancellation_dir.$cancellation_filename, $file);

        // Storno-Lieferschein erstellen (außer bei Sammelbestellung)
        if (! $this->model->shopping_collect_order) {
            $pdf_file = new InvoicePDF('pdf.cancellation_delivery');
            $pdf_file->create($data, $cancellation_delivery_filename, 'save', $path.$cancellation_delivery_dir);
            $pdfMerger = new MyPDFMerger;
            $pdfMerger->addPDF($path.$cancellation_delivery_dir.$cancellation_delivery_filename);
            $file = $pdfMerger->myMerge('string', $cancellation_delivery_filename, $template);
            Storage::disk('public')->put($cancellation_delivery_dir.$cancellation_delivery_filename, $file);
        }
    }

    /**
     * Korrigiert die Punkte nach Stornierung einer Rechnung
     * Nutzt den SalesPointsVolume Service für konsistente Berechnung
     *
     * @param  UserInvoice  $original_invoice  Die ursprüngliche Rechnung
     * @param  UserInvoice  $cancellation_invoice  Die Stornorechnung
     */
    private function correctPointsForCancellation($original_invoice, $cancellation_invoice)
    {
        // Original UserSalesVolume finden
        $original_sales_volume = UserSalesVolume::where('user_invoice_id', $original_invoice->id)->first();

        if (! $original_sales_volume) {
            \Log::warning('Keine UserSalesVolume gefunden für Rechnung', [
                'invoice_id' => $original_invoice->id,
                'order_id' => $this->model->id,
            ]);

            return;
        }

        // Service-Methode verwenden für konsistente Punktekorrektur
        SalesPointsVolume::cancelSalesPointsVolume($original_sales_volume, $cancellation_invoice->id);
    }
}