<?php

namespace App\Models;

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

class Media extends Model
{
    protected $table = 'media';

    protected $fillable = [
        'mediable_type', 'mediable_id',
        'name', 'file_path', 'file_type', 'file_extension', 'file_size',
        'category', 'description', 'metadata', 'uploaded_by',
    ];

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

    // Relación polimórfica: pertenece a Project, Phase, Layer o Feature
    public function mediable()
    {
        return $this->morphTo();
    }

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

    // Helper: URL pública del archivo
    public function getUrlAttribute()
    {
        return Storage::url($this->file_path);
    }

    // Helper: si es imagen
    public function getIsImageAttribute()
    {
        return str_starts_with($this->file_type, 'image/');
    }

    // Helper: tamaño formateado
    public function getFormattedSizeAttribute()
    {
        $bytes = $this->file_size;
        if ($bytes >= 1073741824) return round($bytes / 1073741824, 2) . ' GB';
        if ($bytes >= 1048576) return round($bytes / 1048576, 1) . ' MB';
        if ($bytes >= 1024) return round($bytes / 1024) . ' KB';
        return $bytes . ' B';
    }

    // Scopes
    public function scopeImages($query)
    {
        return $query->where('category', 'image');
    }

    public function scopeDocuments($query)
    {
        return $query->where('category', 'document');
    }

    // Boot: borrar archivo físico al eliminar registro
    protected static function booted()
    {
        static::deleting(function ($media) {
            Storage::delete($media->file_path);
        });
    }
}