<?php

namespace App\Models;

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

class ChatLog extends Model
{
    protected $fillable = [
        'chat_session_id',
        'user_id',
        'category_id',
        'question',
        'answer',
        'sources_used',
        'context_chunks',
        'model_used',
        'tokens_used',
        'response_time',
        'has_answer',
        'is_flagged',
    ];

    protected $casts = [
        'sources_used'   => 'array',
        'context_chunks' => 'array',
        'has_answer'     => 'boolean',
        'is_flagged'     => 'boolean',
        'response_time'  => 'float',
    ];

    // === Relationships ===

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

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

    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    public function feedback(): HasOne
    {
        return $this->hasOne(ChatFeedback::class);
    }

    // === Scopes ===

    public function scopeFlagged(Builder $query): Builder
    {
        return $query->where('is_flagged', true);
    }

    public function scopeNoAnswer(Builder $query): Builder
    {
        return $query->where('has_answer', false);
    }

    public function scopeWithoutFeedback(Builder $query): Builder
    {
        return $query->whereDoesntHave('feedback');
    }
}