<?php

namespace Database\Seeders;

use App\Models\Product;
use App\Models\Purchase;
use App\Models\PurchaseItem;
use App\Models\User;
use Illuminate\Database\Seeder;

class PurchaseSeeder extends Seeder
{
    /**
     * Run the database seeds.
     */
    public function run(): void
    {
        $users = User::all();
        $products = Product::all();

        if ($users->isEmpty() || $products->isEmpty()) {
            return;
        }

        // Generate purchases for the last 6 months, twice a month
        for ($i = 0; $i < 6; $i++) {
            $monthDate = now()->subMonths($i);

            // Two purchases per month
            for ($j = 0; $j < 2; $j++) {
                $purchase = Purchase::factory()->create([
                    'created_at' => $monthDate->copy()->startOfMonth()->addDays(rand(0, 28))->setTime(rand(8, 17), rand(0, 59)),
                ]);

                $itemsCount = rand(1, 5);
                $total = 0;

                for ($k = 0; $k < $itemsCount; $k++) {
                    $product = $products->random();
                    $quantity = rand(1, 10);
                    $unitPrice = rand(10000, 500000);
                    $totalPrice = $quantity * $unitPrice;

                    PurchaseItem::create([
                        'purchase_id' => $purchase->id,
                        'user_id' => $users->random()->id,
                        'product_id' => $product->id,
                        'quantity' => $quantity,
                        'unit_price' => $unitPrice,
                        'total_price' => $totalPrice,
                        'created_at' => $purchase->created_at,
                    ]);

                    $product->increment('stock', $quantity);

                    $total += $totalPrice;
                }

                $purchase->update(['total' => $total]);
            }
        }
    }
}