#nullable enable

using System;
using System.Collections.Generic;

namespace UVC.Data
{
    /// <summary>
    /// URL ÁÖ¼Ò¸¦ Å°-°ª ½ÖÀ¸·Î ÀúÀåÇÏ°í °ü¸®Çϴ Ŭ·¡½ºÀÔ´Ï´Ù.
    /// </summary>
    public static class URLList
    {
        /// <summary>
        /// URLÀ» ÀúÀåÇÏ´Â ³»ºÎ Dictionary Ä÷º¼Ç
        /// </summary>
        private static Dictionary<string, string> urls = new Dictionary<string, string>();

        /// <summary>
        /// ÁöÁ¤µÈ Å°¿Í URLÀ» Ä÷º¼Ç¿¡ Ãß°¡ÇÕ´Ï´Ù. Å°°¡ ÀÌ¹Ì Á¸ÀçÇϸé URLÀ» ¾÷µ¥ÀÌÆ®ÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="key">URL¿¡ Á¢±ÙÇϱâ À§ÇÑ °íÀ¯ Å°</param>
        /// <param name="url">ÀúÀåÇÒ URL ¹®ÀÚ¿­</param>
        /// <example>
        /// <code>
        /// URLList.Add("google", "https://www.google.com");
        /// URLList.Add("naver", "https://www.naver.com");
        /// 
        /// // ±âÁ¸ Å°ÀÇ URL ¾÷µ¥ÀÌÆ®
        /// URLList.Add("google", "https://www.google.co.kr");
        /// </code>
        /// </example>
        public static void Add(string key, string url)
        {
            if (!urls.ContainsKey(key))
            {
                urls.Add(key, url);
            }
            else
            {
                urls[key] = url; // Update existing URL
            }
        }

        /// <summary>
        /// ÁöÁ¤µÈ Å°¿¡ ÇØ´çÇÏ´Â URLÀ» Ä÷º¼Ç¿¡¼­ Á¦°ÅÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="key">Á¦°ÅÇÒ URLÀÇ Å°</param>
        /// <example>
        /// <code>
        /// URLList.Add("temp", "https://www.temp.com");
        /// 
        /// // URL Á¦°Å
        /// URLList.Remove("temp");
        /// 
        /// // Á¸ÀçÇÏÁö ¾Ê´Â Å° Á¦°Å ½Ãµµ(¾Æ¹« Àϵµ ¹ß»ýÇÏÁö ¾ÊÀ½)
        /// URLList.Remove("nonexistent");
        /// </code>
        /// </example>
        public static void Remove(string key)
        {
            if (urls.ContainsKey(key))
            {
                urls.Remove(key);
            }
        }

        /// <summary>
        /// ÁöÁ¤µÈ Å°°¡ Ä÷º¼Ç¿¡ Á¸ÀçÇÏ´ÂÁö È®ÀÎÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="key">È®ÀÎÇÒ Å°</param>
        /// <returns>Å°°¡ Á¸ÀçÇϸé true, ±×·¸Áö ¾ÊÀ¸¸é false</returns>
        /// <example>
        /// <code>
        /// URLList.Add("github", "https://github.com");
        /// 
        /// // Å° Á¸Àç ¿©ºÎ È®ÀÎ
        /// if(URLList.ContainsKey("github"))
        /// {
        ///     Console.WriteLine("GitHub URLÀÌ Á¸ÀçÇÕ´Ï´Ù.");
        /// }
        /// 
        /// if(!URLList.ContainsKey("gitlab"))
        /// {
        ///     Console.WriteLine("GitLab URLÀÌ Á¸ÀçÇÏÁö ¾Ê½À´Ï´Ù.");
        /// }
        /// </code>
        /// </example>
        public static bool ContainsKey(string key)
        {
            return urls.ContainsKey(key);
        }

        /// <summary>
        /// ÁöÁ¤µÈ Å°¿¡ ÇØ´çÇÏ´Â URLÀ» ¹ÝȯÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="key">°¡Á®¿Ã URLÀÇ Å°</param>
        /// <returns>Å°¿¡ ÇØ´çÇÏ´Â URL ¶Ç´Â Å°°¡ Á¸ÀçÇÏÁö ¾ÊÀ» °æ¿ì null</returns>
        /// <example>
        /// <code>
        /// URLList.Add("youtube", "https://www.youtube.com");
        /// 
        /// // URL °¡Á®¿À±â
        /// string youtubeUrl = URLList.Get("youtube");
        /// if (youtubeUrl != null)
        /// {
        ///     Console.WriteLine($"YouTube URL: {youtubeUrl}");
        /// }
        /// 
        /// // Á¸ÀçÇÏÁö ¾Ê´Â Å°·Î URL °¡Á®¿À±â
        /// string nullUrl = URLList.Get("nonexistent");
        /// if (nullUrl == null)
        /// {
        ///     Console.WriteLine("URLÀÌ Á¸ÀçÇÏÁö ¾Ê½À´Ï´Ù.");
        /// }
        /// </code>
        /// </example>
        public static string? Get(string key)
        {
            if (urls.TryGetValue(key, out string url))
            {
                return url;
            }
            return null; // or throw an exception if preferred
        }

        /// <summary>
        /// URL¿¡¼­ µµ¸ÞÀÎ ºÎºÐÀ» ÃßÃâÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="url">µµ¸ÞÀÎÀ» ÃßÃâÇÒ URL</param>
        /// <returns>ÃßÃâµÈ µµ¸ÞÀÎ ¶Ç´Â ÆÄ½Ì ½ÇÆÐ ½Ã null</returns>
        /// <example>
        /// <code>
        /// string domain = URLList.ExtractDomain("https://www.example.com/path/page.html");
        /// Console.WriteLine(domain); // Ãâ·Â: www.example.com
        /// </code>
        /// </example>
        public static string? ExtractDomain(string url)
        {
            if (string.IsNullOrEmpty(url))
                return null;

            try
            {
                Uri uri = new Uri(url);
                return uri.Host;
            }
            catch (UriFormatException)
            {
                return null;
            }
        }
    }
}