<?php

namespace app\service;

use app\model\AiModel;
use think\exception\HttpResponseException;

class GuestAccessService
{
    public const MODEL_NAME = 'qwen3.6';

    public static function isGuest(array $user): bool
    {
        return !empty($user['is_guest']);
    }

    public static function model(): AiModel
    {
        $models = AiModel::where('enabled', 1)->order('sort_order')->order('id')->select();
        foreach ($models as $model) {
            $identity = strtolower(trim((string) ($model->model_id ?: $model->name)));
            $name = strtolower(trim((string) $model->name));
            if (str_starts_with($identity, self::MODEL_NAME) || str_starts_with($name, self::MODEL_NAME)) {
                return $model;
            }
        }

        self::abort('游客专用模型 qwen3.6 尚未启用，请联系管理员', 503);
    }

    public static function modelId(): int
    {
        return (int) self::model()->id;
    }

    public static function assertModelAllowed(array $user, ?int $modelId): int
    {
        if (!self::isGuest($user)) {
            return $modelId ?: 0;
        }

        $guestModelId = self::modelId();
        if ($modelId && $modelId !== $guestModelId) {
            self::abort('游客仅可使用 qwen3.6 模型，登录后可使用全部模型', 403);
        }

        return $guestModelId;
    }

    public static function assertTextChatOnly(array $user, array $attachments, string $agentId, string $imageTool, bool $voiceMode): void
    {
        if (!self::isGuest($user)) {
            return;
        }

        if ($attachments || $agentId !== '' || $imageTool !== '' || $voiceMode) {
            self::abort('游客仅支持 qwen3.6 文本对话，登录后可使用全部模型和工具', 403);
        }
    }

    public static function assertAccountRequired(array $user, string $feature): void
    {
        if (self::isGuest($user)) {
            self::abort("游客不能使用{$feature}，请先登录", 403);
        }
    }

    private static function abort(string $message, int $httpCode): never
    {
        throw new HttpResponseException(json([
            'code'    => 1,
            'message' => $message,
            'data'    => null,
        ], $httpCode));
    }
}