<?php

namespace App\Models\Transactions;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Purchase extends Model
{
    use HasFactory;

    protected $fillable = [
        'date',
        'shares',
        'price_per_share',
        'total_cost',
    ];

    protected $casts = [
        'date' => 'date',
        'shares' => 'decimal:6',
        'price_per_share' => 'decimal:4',
        'total_cost' => 'decimal:2',
    ];

    /**
     * Calculate total shares
     */
    public static function totalShares(): float
    {
        return static::sum('shares');
    }

    /**
     * Calculate total investment
     */
    public static function totalInvestment(): float
    {
        return static::sum('total_cost');
    }

    /**
     * Get average cost per share
     */
    public static function averageCostPerShare(): float
    {
        $totalShares = static::totalShares();
        $totalCost = static::totalInvestment();
        
        return $totalShares > 0 ? $totalCost / $totalShares : 0;
    }
}