<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasManyThrough;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\HasOne;

class ForumCategory extends Model
{
    protected $table = 'forum_categories';

    protected $fillable = [
        'id', 'name', 'slug', 'parent_id', 'position'
    ];

    public $incrementing = true;

    public function parent(): BelongsTo
    {
        return $this->belongsTo(ForumCategory::class, 'parent_id');
    }

    public function children(): HasMany
    {
        return $this->hasMany(ForumCategory::class, 'parent_id');
    }

    public function threads(): HasMany
    {
        return $this->hasMany(ForumThread::class, 'category_id');
    }

    public function postsThroughThreads(): HasManyThrough
    {
        return $this->hasManyThrough(
            ForumPost::class,
            ForumThread::class,
            'category_id',
            'thread_id',
            'id',
            'id'
        );
    }

    public function lastThread(): HasOne
    {
        return $this->hasOne(ForumThread::class, 'category_id')->latestOfMany('last_post_at');
    }

    public function scopeOrdered(Builder $query): Builder
    {
        return $query->orderBy('position')->orderBy('id');
    }

    public function scopeRoots(Builder $query): Builder
    {
        return $query->whereNull('parent_id');
    }

    public function scopeWithForumStats(Builder $query): Builder
    {
        return $query
            ->withCount(['threads as thread_count'])
            ->withCount(['postsThroughThreads as post_count'])
            ->with(['lastThread' => function ($relationQuery) {
                $relationQuery->select([
                    'forum_threads.id',
                    'forum_threads.category_id',
                    'forum_threads.last_post_at',
                    'forum_threads.updated_at',
                ]);
            }]);
    }

    public function getPreviewImageAttribute(): string
    {
        $slug = (string) ($this->slug ?? '');
        $map = (array) config('forum.preview_images.map', []);
        $default = (string) config('forum.preview_images.default', '/images/forum/default.jpg');

        if ($slug !== '' && !empty($map[$slug])) {
            return (string) $map[$slug];
        }

        if ($slug !== '') {
            return '/images/forum/defaults/' . $slug . '.jpg';
        }

        return $default;
    }
}