<?php

declare(strict_types=1);

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class InvoiceSettings extends Model
{
    protected $table = 'invoice_settings';

    protected $fillable = [
        'invoice_prefix',
        'invoice_next_number',
        'header_name',
        'header_title',
        'header_logo',
        'accent_color',
        'default_tax_rate',
        'default_currency',
        'default_service_description',
        'default_bank_name',
        'default_branch_name',
        'default_bank_account',
        'default_bank_holder',
        'default_notes',
        'signature_image',
        'signer_name',
        'signer_title',
    ];

    protected $casts = [
        'invoice_next_number' => 'integer',
        'default_tax_rate' => 'decimal:2',
    ];

    protected static ?self $instance = null;

    /** Always return the single settings row, creating it if absent. */
    public static function instance(): self
    {
        if (self::$instance) {
            return self::$instance;
        }

        self::$instance = static::firstOrCreate([], [
            'invoice_prefix' => 'INV',
            'invoice_next_number' => 1,
            'accent_color' => '#FFB7C5',
            'default_tax_rate' => 2.5,
            'default_currency' => 'IDR',
        ]);

        return self::$instance;
    }

    protected static function booted()
    {
        static::saved(fn ($model) => self::$instance = $model);
        static::deleted(fn () => self::$instance = null);
    }

    public static function generateNumber(): string
    {
        $settings = static::instance();
        $prefix = rtrim($settings->invoice_prefix, '-');
        $number = str_pad((string) $settings->invoice_next_number, 3, '0', STR_PAD_LEFT);
        $settings->increment('invoice_next_number');
        \Illuminate\Support\Facades\Cache::forget('invoice_settings');
        return $prefix . '-' . $number;
    }
}