<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Coupon extends Model
{
    protected $fillable = ['code','type','value','min_order_value','expires_at','max_uses','used_count','active'];
    protected $casts = [
        'active'          => 'boolean',
        'expires_at'      => 'datetime',
        'value'           => 'decimal:2',
        'min_order_value' => 'decimal:2',
    ];

    public static function findValid(string $code): ?self
    {
        return self::where('code', strtoupper(trim($code)))
            ->where('active', true)
            ->where(fn($q) => $q->whereNull('expires_at')->orWhere('expires_at', '>=', now()))
            ->where(fn($q) => $q->whereNull('max_uses')->orWhereColumn('used_count', '<', 'max_uses'))
            ->first();
    }

    public function calcDiscount(float $subtotal): float
    {
        if ($this->min_order_value && $subtotal < $this->min_order_value) {
            return 0.0;
        }
        if ($this->type === 'percent') {
            return round($subtotal * $this->value / 100, 2);
        }
        return min((float) $this->value, $subtotal);
    }
}