<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Casts\Attribute;
use Illuminate\Database\Eloquent\Model;

class Course extends Model
{
    protected $guarded = [];
    public $appends = [
        'paid_amount'
    ];

    public function category(){
        return $this->belongsTo(Category::class);
    }

    public function user(){
        return $this->belongsTo(User::class, 'student_id');
    }

    public function allTransactions(){
        return $this->hasMany(Transaction::class);
    }
    public function creditTransactions(){
        return $this->hasMany(Transaction::class)->where('type','CREDIT');
    }
    public function debitTransactions(){
        return $this->hasMany(Transaction::class)->where('type','DEBIT');
    }

    protected function paidAmount(): Attribute
    {
        $creditAmount = $this->creditTransactions->sum('amount');
        $debitAmount = $this->debitTransactions->sum('amount');
        $total = $creditAmount - $debitAmount;
        return Attribute::make(
            get: fn ($value) => $total ,
        );
    }
}