<?php

declare(strict_types=1);

namespace App\Constants;

class ErrorCode
{
    // Authentication & Authorization
    public const VALIDATION_ERROR = 'validation_error';
    public const SERVER_ERROR = 'server_error';
    public const NOT_FOUND = 'not_found';
    public const UNAUTHORIZED = 'unauthorized';
    public const FORBIDDEN = 'forbidden';
    public const TOKEN_INVALID = 'token_invalid';
    public const TOKEN_EXPIRED = 'token_expired';
    public const INVALID_CREDENTIALS = 'invalid_credentials';

    // Resource Related
    public const RESOURCE_NOT_FOUND = 'resource_not_found';
    public const RESOURCE_IN_USE = 'resource_in_use';

    // Request Related
    public const INVALID_REQUEST_FORMAT = 'invalid_request_format';
    public const METHOD_NOT_ALLOWED = 'method_not_allowed';
    public const TOO_MANY_REQUESTS = 'too_many_requests';

    // Client Related
    public const CLIENT_INACTIVE = 'client_inactive';
    public const CLIENT_NOT_FOUND = 'client_not_found';
    public const CLIENT_HAS_ACTIVE_TOKENS = 'client_has_active_tokens';

    // Provider Related
    public const PROVIDER_ERROR = 'provider_error';
    public const LLM_PROVIDER_NOT_FOUND = 'llm_provider_not_found';
    public const LLM_REQUEST_FAILED = 'llm_request_failed';

    private static array $messages = [
        // Authentication & Authorization
        self::VALIDATION_ERROR => '請求參數驗證失敗。',
        self::SERVER_ERROR => '服務器內部錯誤。',
        self::NOT_FOUND => '請求的資源不存在。',
        self::UNAUTHORIZED => '未授權，請先登錄。',
        self::FORBIDDEN => '禁止訪問，權限不足。',
        self::TOKEN_INVALID => '令牌無效。',
        self::TOKEN_EXPIRED => '令牌已過期。',
        self::INVALID_CREDENTIALS => '認證憑據無效。',

        // Resource Related
        self::RESOURCE_NOT_FOUND => '請求的資源不存在。',
        self::RESOURCE_IN_USE => '資源正在使用中，無法執行操作。',

        // Request Related
        self::INVALID_REQUEST_FORMAT => '請求格式無效。',
        self::METHOD_NOT_ALLOWED => '請求方法不允許。',
        self::TOO_MANY_REQUESTS => '請求過於頻繁，請稍後再試。',

        // Client Related
        self::CLIENT_INACTIVE => '客戶帳戶未啟用。',
        self::CLIENT_NOT_FOUND => '客戶不存在。',
        self::CLIENT_HAS_ACTIVE_TOKENS => '客戶有活躍的認證令牌。',

        // Provider Related
        self::PROVIDER_ERROR => '提供商服務錯誤。',
        self::LLM_PROVIDER_NOT_FOUND => 'LLM 提供商不存在。',
        self::LLM_REQUEST_FAILED => 'LLM 請求失敗。',
    ];

    public static function getMessage(string $code): string
    {
        return self::$messages[$code] ?? '未知錯誤。';
    }
}