<?php

namespace App\Console\Commands\Migrations;

use App\Models\Outlet;
use App\Models\Product;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class MigrateProductsFromOldData extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'migrate:products {--force : Force migration without confirmation} {--recreate : Delete existing products and recreate}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Migrate products data from old database to new structure';

    /**
     * Execute the console command.
     */
    public function handle()
    {
        if ($this->option('recreate')) {
            if (! $this->confirm('Are you sure you want to DELETE ALL EXISTING PRODUCTS and recreate them? This action cannot be undone.')) {
                $this->info('Migration cancelled.');

                return;
            }

            $this->warn('Deleting all existing products...');
            Product::query()->delete(); // This will cascade delete outlet relations
            $this->info('All products deleted.');
        } elseif (! $this->option('force') && ! $this->confirm('Are you sure you want to migrate products data? This will add new products to your database.')) {
            $this->info('Migration cancelled.');

            return;
        }

        $this->info('Starting products migration...');

        try {
            $oldProducts = DB::connection('old_database')->table('products')->whereNull('deleted_at')->get();

            $this->info("Found {$oldProducts->count()} products to migrate.");
            $bar = $this->output->createProgressBar($oldProducts->count());

            $migrated = 0;
            $skipped = 0;

            foreach ($oldProducts as $oldProduct) {
                $existingProduct = Product::where('name', $oldProduct->name)->first();

                if (! $this->option('recreate') && $existingProduct) {
                    $this->warn("Product '{$oldProduct->name}' already exists, skipping...");
                    $skipped++;
                    $bar->advance();

                    continue;
                }

                $product = Product::create([
                    'name' => $oldProduct->name,
                    'slug' => Str::slug($oldProduct->name),
                    'sku' => $this->generateSKU('PROD', $oldProduct->id),
                    'cost_price' => $oldProduct->buying_price,
                    'sale_price' => $oldProduct->selling_price,
                    'description' => null,
                    'views' => 0,
                    'created_at' => $oldProduct->created_at,
                    'updated_at' => $oldProduct->updated_at,
                ]);

                // Create outlet relations from product_stocks
                $this->createProductOutletRelations($product->id, $oldProduct->id);

                $migrated++;
                $bar->advance();
            }

            $bar->finish();
            $this->newLine(2);

            $this->info('✅ Products migration completed!');
            $this->info("📊 Migrated: {$migrated} products");
            $this->info("⏭️  Skipped: {$skipped} products (already exist)");
        } catch (\Exception $e) {
            $this->error("❌ Migration failed: {$e->getMessage()}");

            return 1;
        }

        return 0;
    }

    private function createProductOutletRelations(int $newProductId, int $oldProductId): void
    {
        try {
            // Get product stocks from old database
            $productStocks = DB::connection('old_database')
                ->table('product_stocks')
                ->where('product_id', $oldProductId)
                ->get();

            foreach ($productStocks as $stock) {
                // Map old store_id to new outlet_id
                $outletMapping = $this->getOutletMapping();
                $outletId = $outletMapping[$stock->store_id] ?? null;

                if ($outletId) {
                    // Create many-to-many relation with stock amount
                    DB::table('outlet_product')->insert([
                        'outlet_id' => $outletId,
                        'product_id' => $newProductId,
                        'stock' => $stock->amount,
                        'created_at' => now(),
                        'updated_at' => now(),
                    ]);
                }
            }
        } catch (\Exception $e) {
            $this->warn("Could not create outlet relations for product ID {$newProductId}: {$e->getMessage()}");
        }
    }

    private function getOutletMapping(): array
    {
        // Map old store_id to new outlet_id
        // This assumes outlets have been migrated first
        $outlets = Outlet::select('id')->orderBy('id')->get();

        $mapping = [];
        foreach ($outlets as $index => $outlet) {
            $mapping[$index + 1] = $outlet->id; // Old store_id starts from 1
        }

        return $mapping;
    }

    private function generateSKU(string $prefix, int $id): string
    {
        // Use timestamp to ensure uniqueness when recreating
        $timestamp = now()->format('His');

        return $prefix.str_pad($id, 3, '0', STR_PAD_LEFT).$timestamp;
    }
}