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Filename : GiftDeal.php
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<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class GiftDeal extends Model
{
    protected $fillable = [
        'title',
        'slug',
        'buy_product_id',
        'buy_products',
        'min_buy_quantity',
        'gift_product_id',
        'gift_products',
        'start_date',
        'end_date',
        'status',
    ];

    protected $casts = [
        'start_date' => 'datetime',
        'end_date' => 'datetime',
        'status' => 'boolean',
        'gift_products' => 'array',
        'buy_products' => 'array',
        'min_buy_quantity' => 'integer',
    ];

    public function buyProduct(): BelongsTo
    {
        return $this->belongsTo(Product::class, 'buy_product_id');
    }

    public function giftProduct(): BelongsTo
    {
        return $this->belongsTo(Product::class, 'gift_product_id');
    }

    /**
     * Get gift products list with quantities
     * Returns: [['product_id' => x, 'quantity' => y], ...]
     */
    public function getGiftProductsList(): array
    {
        // Support both new JSON format and legacy single product
        if (!empty($this->gift_products)) {
            return $this->gift_products;
        }
        
        if ($this->gift_product_id) {
            return [['product_id' => $this->gift_product_id, 'quantity' => 1]];
        }
        
        return [];
    }

    /**
     * Get buy products list with minimum quantities
     * Returns: [['product_id' => x, 'min_quantity' => y], ...]
     */
    public function getBuyProductsList(): array
    {
        // Support both new JSON format and legacy single product
        if (!empty($this->buy_products)) {
            return $this->buy_products;
        }
        
        if ($this->buy_product_id) {
            return [['product_id' => $this->buy_product_id, 'min_quantity' => $this->min_buy_quantity ?? 1]];
        }
        
        return [];
    }

    /**
     * Check if a product purchase qualifies for this deal
     */
    public function qualifiesForDeal(int $productId, int $quantity): bool
    {
        $buyProducts = $this->getBuyProductsList();
        
        foreach ($buyProducts as $buyProduct) {
            if ($buyProduct['product_id'] == $productId) {
                $minQty = $buyProduct['min_quantity'] ?? 1;
                return $quantity >= $minQty;
            }
        }
        
        return false;
    }
}