<?php

namespace App\Models;

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

class Message extends Model
{
    use HasFactory;

    public const ROLE_USER = 'USER';
    public const ROLE_AGENT = 'AGENT';
    public const ROLE_TOOL = 'TOOL';
    public const ROLE_SYSTEM = 'SYSTEM';

    protected $primaryKey = 'message_id';

    public $incrementing = false;

    protected $keyType = 'string';

    public $timestamps = false;

    protected $fillable = [
        'message_id',
        'session_id',
        'role',
        'type',
        'content',
        'payload',
        'seq',
        'reply_to',
        'dedupe_key',
        'created_at',
    ];

    protected function casts(): array
    {
        return [
            'payload' => 'array',
            'seq' => 'integer',
            'created_at' => 'datetime',
        ];
    }

    public function session(): BelongsTo
    {
        return $this->belongsTo(ChatSession::class, 'session_id', 'session_id');
    }
}