<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

class DocumentCategory extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'slug',
        'description',
        'icon',
        'sort_order',
        'default_access_level',
    ];

    protected static function boot()
    {
        parent::boot();

        // Auto-generate slug from name if not provided
        static::creating(function ($category) {
            if (empty($category->slug)) {
                $category->slug = Str::slug($category->name);
            }
        });
    }

    // ==================== Relationships ====================

    /**
     * Get all documents in this category
     */
    public function documents()
    {
        return $this->hasMany(Document::class);
    }

    /**
     * Get active (non-archived) documents in this category
     */
    public function activeDocuments()
    {
        return $this->hasMany(Document::class)->where('status', 'active');
    }

    // ==================== Accessors ====================

    /**
     * Get the count of active documents in this category
     */
    public function getDocumentCountAttribute(): int
    {
        return $this->activeDocuments()->count();
    }

    // ==================== Helper Methods ====================

    /**
     * Get the icon with fallback
     */
    public function getIconDisplay(): string
    {
        return $this->icon ?? '📄';
    }

    /**
     * Get the access level label
     */
    public function getAccessLevelLabel(): string
    {
        return match($this->default_access_level) {
            'public' => '公開',
            'members' => '會員',
            'admin' => '管理員',
            'board' => '理事會',
            default => '未知',
        };
    }
}