<?php

namespace App\Models;

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

class Post extends Model
{
    use HasFactory;

    public const STATUS_DRAFT = 'draft';
    public const STATUS_PUBLISHED = 'published';

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'title',
        'slug',
        'content',
        'excerpt',
        'category_id',
        'featured_image',
        'is_featured',
        'status',
        'published_at',
    ];

    /**
     * The attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'is_featured' => 'boolean',
            'published_at' => 'datetime',
        ];
    }

    /**
     * Boot the model and register model events.
     */
    protected static function booted(): void
    {
        static::creating(function (Post $post): void {
            if (blank($post->slug)) {
                $post->slug = static::generateUniqueSlug($post->title);
            }
        });

        static::updating(function (Post $post): void {
            if ($post->isDirty('title') && blank($post->slug)) {
                $post->slug = static::generateUniqueSlug($post->title, $post->id);
            }
        });
    }

    /**
     * Get the category that owns the post.
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    /**
     * Generate a unique slug based on the post title.
     */
    public static function generateUniqueSlug(string $title, ?int $ignoreId = null): string
    {
        $baseSlug = Str::slug($title);
        $slug = $baseSlug;
        $counter = 1;

        while (static::query()
            ->where('slug', $slug)
            ->when($ignoreId, fn ($query) => $query->whereKeyNot($ignoreId))
            ->exists()) {
            $slug = "{$baseSlug}-{$counter}";
            $counter++;
        }

        return $slug;
    }

    /**
     * Determine whether the post is published.
     */
    public function isPublished(): bool
    {
        return $this->status === self::STATUS_PUBLISHED;
    }
}