<?php

namespace Database\Seeders;

use App\Models\Perfume;
use App\Models\Product;
use App\Models\Purchase;
use App\Models\PurchaseItem;
use App\Models\User;
use App\Models\Warehouse;
use Illuminate\Database\Seeder;
use Illuminate\Support\Collection;

class PurchaseSeeder extends Seeder
{
    public function run(): void
    {
        $warehouses = Warehouse::all();
        if ($warehouses->isEmpty()) {
            $warehouses = Warehouse::factory(3)->create();
        }

        $users = User::all();
        if ($users->isEmpty()) {
            $users = User::factory(5)->create();
        }

        $perfumes = Perfume::all();
        $products = Product::all();

        if ($perfumes->isEmpty() && $products->isEmpty()) {
            $perfumes = Perfume::factory(10)->create();
        }

        $purchasableItems = collect();
        if ($perfumes->isNotEmpty()) {
            $purchasableItems = $purchasableItems->merge($perfumes);
        }
        if ($products->isNotEmpty()) {
            $purchasableItems = $purchasableItems->merge($products);
        }

        $startDate = now()->subMonths(6)->startOfMonth();
        $endDate = now();
        $purchaseCount = 0;

        // Iterate through each month
        for ($date = $startDate->copy(); $date->lte($endDate); $date->addMonth()) {
            // Purchases twice a month (e.g., 5th and 20th)
            $purchaseDates = [
                $date->copy()->day(5),
                $date->copy()->day(20),
            ];

            foreach ($purchaseDates as $purchaseDate) {
                if ($purchaseDate->gt($endDate)) {
                    continue; // Skip if date is in the future
                }

                $purchaseCount++;
                $warehouse = $warehouses->random();

                $purchaseTime = $purchaseDate->copy()->addHours(rand(9, 16))->addMinutes(rand(0, 59));

                $purchase = Purchase::create([
                    'warehouse_id' => $warehouse->id,
                    'invoice_number' => 'PO'.$purchaseTime->format('Ymd').str_pad($purchaseCount, 4, '0', STR_PAD_LEFT),
                    'purchase_date' => $purchaseTime->toDateString(),
                    'total' => 0,
                    'note' => 'Restock '.$purchaseTime->format('F Y'),
                    'created_at' => $purchaseTime,
                    'updated_at' => $purchaseTime,
                ]);

                $this->createPurchaseItems($purchase, $users->random(), $purchasableItems);
            }
        }
    }

    private function createPurchaseItems(Purchase $purchase, User $user, Collection $purchasables): void
    {
        $itemCount = rand(5, 15);
        $totalPurchase = 0;

        for ($j = 0; $j < $itemCount; $j++) {
            $item = $purchasables->random();
            $qty = rand(50, 500);

            $unitPrice = $item->cost_price ?? (int) (($item->sale_price ?? rand(50000, 150000)) * 0.4);
            $totalPrice = $unitPrice * $qty;

            PurchaseItem::create([
                'purchase_id' => $purchase->id,
                'user_id' => $user->id,
                'purchasable_type' => $item->getMorphClass(),
                'purchasable_id' => $item->id,
                'quantity' => $qty,
                'unit_price' => $unitPrice,
                'total_price' => $totalPrice,
                'created_at' => $purchase->created_at,
                'updated_at' => $purchase->created_at,
            ]);

            $totalPurchase += $totalPrice;
        }

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