<?php

namespace App\Models;

use App\Traits\InteractsWithUuid;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Transaction extends Model
{
    use HasFactory, InteractsWithUuid;

    protected $table = 't_transaction';
    protected $primaryKey = 'id';
    protected $keyType = 'string';
    public $incrementing = false;

    protected $fillable = [
        'invoice_number',
        'registration_id',
        'patient_id',
        'insurance_id',
        'cashier_id',
        'transaction_datetime',
        'payment_datetime',
        'due_date',
        'subtotal',
        'tax_amount',
        'discount_amount',
        'discount_reason',
        'grand_total',
        'paid_amount',
        'change_amount',
        'insurance_covered_amount',
        'patient_responsibility',
        'payment_method',
        'payment_reference',
        'status',
        'notes',
    ];

    protected $casts = [
        'transaction_datetime' => 'datetime',
        'payment_datetime' => 'datetime',
        'due_date' => 'date',
        'subtotal' => 'decimal:2',
        'tax_amount' => 'decimal:2',
        'discount_amount' => 'decimal:2',
        'grand_total' => 'decimal:2',
        'paid_amount' => 'decimal:2',
        'change_amount' => 'decimal:2',
        'insurance_covered_amount' => 'decimal:2',
        'patient_responsibility' => 'decimal:2',
    ];

    // Relationships
    public function registration(): BelongsTo
    {
        return $this->belongsTo(Registration::class, 'registration_id');
    }

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

    public function insurance(): BelongsTo
    {
        return $this->belongsTo(Insurance::class, 'insurance_id');
    }

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

    public function details(): HasMany
    {
        return $this->hasMany(TransactionDetail::class, 'transaction_id');
    }

    // helper untuk generate invoice number
    public static function generateInvoiceNumber(): string
    {
        $datePart = now()->format('Ymd');
        $lastInvoice = self::where('invoice_number', 'like', "INV-{$datePart}-%")
            ->orderBy('invoice_number', 'desc')
            ->first();

        $sequence = $lastInvoice
            ? (int) substr($lastInvoice->invoice_number, -3) + 1
            : 1;

        return sprintf('INV-%s-%03d', $datePart, $sequence);
    }
}