<?php

namespace App\Console\Commands;

use App\Models\Packing;
use App\Models\Product;
use App\Models\ProductInventory;
use App\Models\ProductSize;
use App\Services\ShopifyService;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class ShopifyImport extends Command
{
    protected $signature   = 'shopify:import {--dry-run : Nur anzeigen, nichts speichern}';
    protected $description = 'Importiert Produkte und Lagerbestand direkt aus der Shopify API';

    public function handle(ShopifyService $shopify): int
    {
        $dryRun = $this->option('dry-run');
        $variants = $shopify->getAllVariants();

        if (empty($variants)) {
            $this->error('Keine Varianten von Shopify erhalten (Details im Log).');
            return self::FAILURE;
        }

        $this->info('Shopify-Varianten geladen: ' . count($variants));

        $stats = ['products' => 0, 'sizes' => 0, 'inventory' => 0, 'skipped' => 0];

        $newProducts = [];

        DB::transaction(function () use ($variants, $dryRun, &$stats, &$newProducts) {
            foreach ($variants as $variant) {
                $packingRaw = $variant['option1'];

                $parsed = $this->parsePacking($packingRaw, $variant['sku']);

                if ($parsed === null) {
                    $this->warn("  ⚠ Verpackungsformat nicht erkannt: '{$packingRaw}' ({$variant['sku']}) – übersprungen");
                    $stats['skipped']++;
                    continue;
                }

                if ($dryRun) {
                    $this->line("  {$variant['product_title']} | {$parsed['name']} {$parsed['size']} | SKU {$variant['sku']} | Bestand {$variant['inventory_quantity']}");
                    continue;
                }

                $packing = Packing::firstOrCreate([
                    'name' => $parsed['name'],
                    'size' => $parsed['size'],
                ]);

                $product = Product::firstOrCreate(
                    ['title' => $variant['product_title']],
                    ['recipes_id' => null],
                );
                if ($product->wasRecentlyCreated) {
                    $stats['products']++;
                    // Collect for image download after transaction
                    $newProducts[$product->id] = [
                        'product'    => $product,
                        'image_urls' => $variant['image_urls'],
                    ];
                }

                $size = ProductSize::firstOrCreate(
                    ['product_id' => $product->id, 'packing_id' => $packing->id],
                    ['sku' => $variant['sku'], 'shopify_variant_id' => $variant['id'], 'price' => 0],
                );

                // Bestehende Size ohne Variant-ID nachträglich verknüpfen
                if (! $size->wasRecentlyCreated && ! $size->shopify_variant_id) {
                    $size->update(['shopify_variant_id' => $variant['id'], 'sku' => $variant['sku']]);
                }

                if ($size->wasRecentlyCreated) {
                    $stats['sizes']++;
                }

                // Lagerbestand: aktuelle Differenz auffüllen
                $localQty = ProductInventory::where('size_id', $size->id)->whereNull('out_at')->count();
                $diff = $variant['inventory_quantity'] - $localQty;

                if ($diff > 0) {
                    for ($i = 0; $i < $diff; $i++) {
                        ProductInventory::create([
                            'product_id' => $product->id,
                            'size_id'    => $size->id,
                        ]);
                    }
                    $stats['inventory'] += $diff;
                }
            }
        });

        // Download images outside the transaction to avoid holding DB locks during HTTP calls
        foreach ($newProducts as ['product' => $product, 'image_urls' => $urls]) {
            $this->downloadImages($product, $urls);
        }

        if (! $dryRun) {
            $this->info("✓ {$stats['products']} Produkte erstellt");
            $this->info("✓ {$stats['sizes']} Varianten erstellt");
            $this->info("✓ {$stats['inventory']} Lagereinträge erstellt");
        }

        if ($stats['skipped']) {
            $this->warn("⚠ {$stats['skipped']} Varianten übersprungen (Verpackungsformat unbekannt)");
        }

        return self::SUCCESS;
    }

    private function downloadImages(Product $product, array $urls): void
    {
        if (empty($urls) || ! empty($product->images)) {
            return;
        }

        $paths = [];
        foreach ($urls as $url) {
            try {
                $response = Http::timeout(30)->get($url);
            } catch (\Exception $e) {
                $this->warn("  Bild-Download fehlgeschlagen ({$product->title}): {$e->getMessage()}");
                continue;
            }

            if ($response->failed()) {
                $this->warn("  HTTP {$response->status()} beim Bild-Download ({$product->title}): {$url}");
                continue;
            }

            $body = $response->body();
            if (empty($body)) {
                $this->warn("  Leere Bild-Antwort ({$product->title}): {$url}");
                continue;
            }

            $ext      = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION) ?: 'jpg';
            $filename = 'product-images/' . Str::uuid() . '.' . $ext;
            Storage::disk('public')->put($filename, $body);
            $paths[] = $filename;
        }

        if (! empty($paths)) {
            $product->update(['images' => $paths]);
            $this->line("  ✓ Bilder gespeichert: {$product->title} (" . count($paths) . ')');
        }
    }

    private function parsePacking(string $option, string $sku): ?array
    {
        // "Standbodenbeutel 100 g" / "Metalldose 40 g"
        if (preg_match('/^(.+?)\s+(\d+(?:[.,]\d+)?)\s*g$/i', $option, $m)) {
            return ['name' => trim($m[1]), 'size' => (float) str_replace(',', '.', $m[2])];
        }

        // "Metalldose 5 Stück" / "Standbodenbeutel 3 Stück"
        if (preg_match('/^(.+?)\s+(\d+)\s*Stück$/i', $option, $m)) {
            return ['name' => trim($m[1]) . ' (Stück)', 'size' => (float) $m[2]];
        }

        // "1 Stange" / "3 Stangen" / "5 Stangen"
        if (preg_match('/^(\d+)\s*Stangen?$/i', $option, $m)) {
            return ['name' => 'Stangen', 'size' => (float) $m[1]];
        }

        // "Default Title" — Verpackung aus SKU ableiten: z.B. GWM-AAS-100SB → 100g Standbodenbeutel
        if ($option === 'Default Title' && preg_match('/(\d+)(SB|MD|GT|BB)$/i', $sku, $m)) {
            $names = ['SB' => 'Standbodenbeutel', 'MD' => 'Metalldose', 'GT' => 'Glas', 'BB' => 'Beutel'];
            return ['name' => $names[strtoupper($m[2])], 'size' => (float) $m[1]];
        }

        return null;
    }
}