<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class ForumThread extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'board_id',
        'user_id',
        'title',
        'body',
        'status',
        'is_pinned',
        'is_locked',
        'views',
        'last_reply_at',
    ];

    protected $casts = [
        'board_id' => 'integer',
        'user_id' => 'integer',
        'is_pinned' => 'boolean',
        'is_locked' => 'boolean',
        'views' => 'integer',
        'last_reply_at' => 'datetime',
    ];

    public const STATUS_PENDING = 'pending';
    public const STATUS_APPROVED = 'approved';
    public const STATUS_REJECTED = 'rejected';

    /**
     * 可见性作用域：
     * - 审核员(forum.moderate)：看全部（含待审/驳回）
     * - 登录用户：看已审 + 自己发的（无论状态）
     * - 游客：仅看已审
     */
    public function scopeVisible($query, ?User $user = null)
    {
        if ($user && $user->canPerm('forum.moderate')) {
            return $query;
        }

        if ($user) {
            return $query->where(function ($q) use ($user) {
                $q->where('status', self::STATUS_APPROVED)
                  ->orWhere('user_id', $user->id);
            });
        }

        return $query->where('status', self::STATUS_APPROVED);
    }

    public function board(): BelongsTo
    {
        return $this->belongsTo(ForumBoard::class, 'board_id');
    }

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class, 'user_id');
    }

    public function replies(): HasMany
    {
        return $this->hasMany(ForumReply::class, 'thread_id');
    }
}