<?php

declare(strict_types=1);

namespace App\Models\Transactions;

use App\Models\Tracker;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Entry extends Model
{
    protected $fillable = [
        'tracker_id',
        'date',
        'quantity',
        'unit_price',
        'total_cost',
    ];

    protected function casts(): array
    {
        return [
            'date' => 'date',
            'quantity' => 'decimal:6',
            'unit_price' => 'decimal:4',
            'total_cost' => 'decimal:2',
        ];
    }

    public function tracker(): BelongsTo
    {
        return $this->belongsTo(Tracker::class);
    }

    public static function totalQuantity(int $trackerId): float
    {
        return (float) static::where('tracker_id', $trackerId)->sum('quantity');
    }

    public static function totalCost(int $trackerId): float
    {
        return (float) static::where('tracker_id', $trackerId)->sum('total_cost');
    }

    public static function averageCostPerUnit(int $trackerId): float
    {
        $totalQuantity = static::totalQuantity($trackerId);
        $totalCost = static::totalCost($trackerId);

        return $totalQuantity > 0 ? $totalCost / $totalQuantity : 0;
    }
}