<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;

class LetterAttachment extends Model
{
    use HasFactory;

    public const UPDATED_AT = null;

    protected $fillable = [
        'letter_id',
        'file_name',
        'file_path',
        'file_size',
        'mime_type',
        'created_at',
    ];

    protected $casts = [
        'file_size' => 'integer',
    ];

    public function letter()
    {
        return $this->belongsTo(Letter::class);
    }

    /**
     * Get the URL for the attachment.
     */
    public function getUrlAttribute(): string
    {
        return Storage::disk('public')->url($this->file_path);
    }

    /**
     * Check if the attachment is an image.
     */
    public function getIsImageAttribute(): bool
    {
        return str_starts_with($this->mime_type ?? '', 'image/');
    }

    /**
     * Check if the attachment is a PDF.
     */
    public function getIsPdfAttribute(): bool
    {
        return ($this->mime_type ?? '') === 'application/pdf';
    }

    /**
     * Get the formatted file size.
     */
    public function getFormattedSizeAttribute(): string
    {
        $bytes = $this->file_size ?? 0;

        if ($bytes >= 1048576) {
            return round($bytes / 1048576, 1) . ' MB';
        }

        if ($bytes >= 1024) {
            return round($bytes / 1024, 1) . ' KB';
        }

        return $bytes . ' B';
    }

    protected static function booted()
    {
        static::creating(function ($attachment) {
            if (empty($attachment->created_at)) {
                $attachment->created_at = now();
            }
        });
    }
}