<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Invoice extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'invoice_number',
        'patient_id',
        'treatment_id',
        'invoice_date',
        'due_date',
        'subtotal',
        'tax_amount',
        'discount_amount',
        'total_amount',
        'paid_amount',
        'status',
        'currency_id',
        'notes',
        'created_by',
    ];

    protected $casts = [
        'invoice_date' => 'date',
        'due_date' => 'date',
        'subtotal' => 'decimal:2',
        'tax_amount' => 'decimal:2',
        'discount_amount' => 'decimal:2',
        'total_amount' => 'decimal:2',
        'paid_amount' => 'decimal:2',
    ];

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

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

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

    public function createdBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    public function payments(): HasMany
    {
        return $this->hasMany(Payment::class);
    }

    public function getBalanceAttribute(): float
    {
        return $this->total_amount - $this->paid_amount;
    }
}