using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Net;
using System.Web;
using System.IO;

namespace FLocal.Migration.Gateway {
	public class ShallerGateway {

		public static readonly Encoding encoding = ShallerConnector.encoding;

		public static string getUserInfoAsString(string userName) {
			//if(userName != HttpUtility.UrlEncode(userName, ShallerConnector.encoding)) throw new ApplicationException("'" + userName + "':showprofile.php?User=" + HttpUtility.UrlEncode(userName, ShallerConnector.encoding) + "&What=login&showlite=l");
			return ShallerConnector.getPageContent("showprofile.php?User=" + HttpUtility.UrlEncode(userName, ShallerConnector.encoding) + "&What=login&showlite=l", new Dictionary<string,string>(), new System.Net.CookieContainer());
		}

		private static Dictionary<string, Regex> regexInfoCache = new Dictionary<string, Regex>();
		private static Regex getInfoRegexByCaption(string caption) {
			if(!regexInfoCache.ContainsKey(caption)) {
				lock(caption) {
					if(!regexInfoCache.ContainsKey(caption)) {
						regexInfoCache[caption] = new Regex("<td[^>]*>\\s*" + caption + "\\s*</td>\\s*<td>\\s*([^<>]*)\\s*</td>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);
					}
				}
			}
			return regexInfoCache[caption];
		}

		private static Regex avatarRegex = new Regex("<img\\s+src=\"/user/(\\d+\\.\\w+)\"\\s+alt=\"Picture\"\\s+width=\"\\d+\"\\s+height=\"\\d+\"\\s*/>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);

		private static Dictionary<string, string> userImportStructure {
			get {
				return new Dictionary<string,string>() {
					{ "regDate", "Дата\\s+регистрации" },
					{ "signature", "Подпись" },
					{ "title", "Титул" },
					{ "location", "Расположение" },
					{ "biography", "Биография" },
				};
			}
		}

		public static Dictionary<string, string> getUserInfo(string userName) {
			string content = getUserInfoAsString(userName);
			Dictionary<string, string> result = userImportStructure.ToDictionary<KeyValuePair<string, string>, string, string>(
				kvp => kvp.Key,
				kvp => HttpUtility.HtmlDecode(getInfoRegexByCaption(kvp.Value).Match(content).Groups[1].Value).Trim()
			);
			result["avatar"] = avatarRegex.Match(content).Groups[1].Value;
			return result;
		}

		public static IEnumerable<string> getUserNames(int pageNum) {
			string content = ShallerConnector.getPageContent("showmembers.php?Cat=&sb=13&page=" + pageNum + "&showlite=l", new Dictionary<string,string>(), new System.Net.CookieContainer());
			Regex matcher = new Regex(";User=([^&]+)&", RegexOptions.Compiled | RegexOptions.Multiline | RegexOptions.IgnoreCase);
			MatchCollection matches = matcher.Matches(content);
			HashSet<string> result = new HashSet<string>();
			foreach(Match match in matches) {
				result.Add(HttpUtility.UrlDecode(match.Groups[1].Value, ShallerConnector.encoding).Trim());
			}
			return result;
		}

		private static FileInfo getFileInfo(string path, int attempt) {
			try {
				return ShallerConnector.getPageInfo(path, new Dictionary<string,string>(), new CookieContainer());
			} catch(Exception) {
				if(attempt > 3) {
					throw;
				} else {
					return getFileInfo(path, attempt + 1);
				}
			}
		}

		public static FileInfo getFileInfo(string path) {
			return getFileInfo(path, 1);
		}

	}
}