using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DeployTools
{
	using System.Diagnostics;
	using System.IO;
	using System.Reflection;
	using System.Security.Cryptography;
	using System.Text.RegularExpressions;

	using Newtonsoft.Json;

	class Program
	{
		static string _projectRoot;
		static string _sourceDirectory;
		static string _destinationDirectory;

		static string _ajaxminiTool;

		static Dictionary<string, string> _sourceFiles;
		static Dictionary<string, string> _moduleMap;

		static void Main(string[] args)
		{
			_projectRoot = Path.GetFullPath(Path.Combine(Assembly.GetExecutingAssembly().Location, @"..\..\"));
			_sourceDirectory = Path.Combine(_projectRoot, "Web12306");
			_destinationDirectory = Path.Combine(_projectRoot, "wwwroot");
			_ajaxminiTool = Path.Combine(_projectRoot, "BuildTools\\AjaxMinifier.exe");
			_moduleMap = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

			Console.WriteLine("使用压缩工具 {0}", _ajaxminiTool);
			Console.WriteLine();

			//1.创建目标目录
			Console.WriteLine("正在准备目标目录....");
			try
			{
				if (Directory.Exists(_destinationDirectory))
					Directory.Delete(_destinationDirectory, true);
			}
			catch (Exception ex)
			{

			}
			Directory.CreateDirectory(_destinationDirectory);
			Console.WriteLine();

			//2.创建文件列表
			Console.WriteLine("正在扫描文件列表...");
			CreateFileList();
			Console.WriteLine("文件总数： {0}", _sourceFiles.Count);
			Console.WriteLine();

			//3.复制文件
			Console.WriteLine("正在将文件复制到目标目录...");
			CopySourceFiles();

			//4.合并处理css文件
			Console.WriteLine("正在合并样式表文件...");
			ProcessCss("css\\index.css");
			Console.WriteLine();

			//5.处理js文件
			ProcessScriptFiles();

			//6.合并js文件
			CombineScript();

			//7.压缩html
			ProcessHtml();

			//8.写入记录
			WriteModuleMap();

			//9.清理目录
			CleanupDirectory();

			Console.WriteLine(_projectRoot);
			Console.ReadKey();
		}

		static void CleanupDirectory()
		{
			Console.WriteLine("正在清理目标目录...");

			foreach (var directory in Directory.GetDirectories(_destinationDirectory))
			{
				CleanupDirectory(directory);
			}

			Console.WriteLine("清理目标目录完成");
			Console.WriteLine();
		}

		static void CleanupDirectory(string path)
		{
			var directorys = Directory.GetDirectories(path);
			foreach (var directory in directorys)
			{
				CleanupDirectory(directory);
			}

			if (Directory.GetDirectories(path).Length > 0 || Directory.GetFiles(path).Length > 0)
				return;
			Directory.Delete(path);
			Console.WriteLine("\t已删除空目录 {0}", path);
		}

		static void WriteModuleMap()
		{
			Console.WriteLine("正在写入模块列表记录...");

			var file = "modules.json";
			var fullFile = Path.Combine(_projectRoot, file);
			File.WriteAllText(fullFile, JsonConvert.SerializeObject(_moduleMap.Select(s => new
			{
				module = s.Key,
				path = s.Value
			}).ToArray()));

			Console.WriteLine("模块列表记录完成");
			Console.WriteLine();
		}

		static void ProcessHtml()
		{
			Console.WriteLine("正在处理HTML页面文件...");

			var htmlFiles = new[] { "index.html" };
			foreach (var htmlFile in htmlFiles)
			{
				Console.Write("正在处理文件 {0} ...", htmlFile);
				ProcessHtml(htmlFile);
				Console.WriteLine("完成");
			}

			Console.WriteLine("HTML页面文件处理完成");
			Console.WriteLine();
		}

		static void ProcessHtml(string file)
		{
			var fileFull = Path.GetFullPath(Path.Combine(_destinationDirectory, file));
			var content = File.ReadAllText(fileFull);

			//处理模板
			content = Regex.Replace(content, @"<script[^>]*?type=['""]?text/x-dot-template['""]?[^>]*?>[\w\W]+?</script>", _ =>
			{
				var tpl = _.Value;
				return Regex.Replace(tpl, @"[\t\s\r\n]{2,}", " ");
			}, RegexOptions.IgnoreCase);
			//release tag
			content = content.Replace("$BUILD_DATE$", DateTime.Now.ToString("yyyyMMddHHmmss"));
			File.WriteAllText(fileFull, content);


			//使用uglify 压缩
			var psi = new ProcessStartInfo(System.Configuration.ConfigurationManager.AppSettings["minifyCmdPath"], "\"" + fileFull + "\"")
			{
				WindowStyle = ProcessWindowStyle.Hidden,
				RedirectStandardOutput = true,
				UseShellExecute = false,
				StandardOutputEncoding = Encoding.UTF8
			};
			var p = Process.Start(psi);
			content = p.StandardOutput.ReadToEnd();



			File.WriteAllText(fileFull, content);
		}

		static void CombineScript()
		{
			Console.WriteLine("正在合并脚本文件...");

			var targetHtml = "index.html";
			var targetFullHtml = Path.Combine(_destinationDirectory, targetHtml);
			var targetContent = File.ReadAllText(targetFullHtml);

			var scripts = _sourceFiles.Keys.ToArray().Where(s => s.EndsWith(".js", StringComparison.OrdinalIgnoreCase)).ToList();
			//处理script标签
			var allScriptTags = new List<string>();
			targetContent = Regex.Replace(targetContent, @"<script.*?src=['""]?([^\s'"">]+?)['""\s>].*?</script>", _ =>
			{
				allScriptTags.Add(Path.GetFullPath(Path.Combine(_destinationDirectory, _.Groups[1].Value)));
				return string.Empty;
			});
			//插入新的脚本
			targetContent = targetContent.Replace("</body>", "<script src=\"js/lib.js?v" + DateTime.Now.ToString("yyyyMMddHHmmss") + "\"></script>");
			File.WriteAllText(targetFullHtml, targetContent);

			//合并脚本库
			var extLibs = allScriptTags.Take(allScriptTags.Count - 1).ToArray();
			var extLibContent = string.Join(";", extLibs.Select(s =>
			{
				var path = Path.Combine(_destinationDirectory, s);
				var content = File.ReadAllText(path);
				File.Delete(path);
				return content;
			}));
			//页面脚本
			var scriptsHash = new HashSet<string>(allScriptTags, StringComparer.OrdinalIgnoreCase);
			var pageLibContent = string.Join(";", scripts.Select(s =>
			{
				var path = Path.GetFullPath(Path.Combine(_destinationDirectory, s));
				if (scriptsHash.Contains(path))
					return string.Empty;

				var content = File.ReadAllText(path);
				File.Delete(path);
				return content;
			}).Where(s => !string.IsNullOrEmpty(s)));

			//引导脚本
			var bootScriptFile = Path.GetFullPath(Path.Combine(_destinationDirectory, allScriptTags.Last()));
			var bootScript = File.ReadAllText(bootScriptFile);
			File.Delete(bootScriptFile);

			var extLibFile = "js/lib.js";
			var extLibFullFile = Path.Combine(_destinationDirectory, extLibFile);


			File.WriteAllText(extLibFullFile, string.Join(";", new[] { extLibContent, pageLibContent, bootScript }));

			Console.WriteLine("脚本文件合并完成");
			Console.WriteLine();
		}

		static void ProcessScriptFiles()
		{
			Console.WriteLine("正在处理脚本文件...");
			foreach (var file in _sourceFiles.Where(s => s.Key.EndsWith(".js", StringComparison.OrdinalIgnoreCase)))
			{
				RewriteModuleId(file.Key);

				//压缩
				CompressScript(file.Key);
			}
			Console.WriteLine("脚本文件处理完成");
			Console.WriteLine();
		}

		static void CompressScript(string filepath)
		{
			Console.Write("正在压缩 " + filepath + "...");
			filepath = Path.GetFullPath(Path.Combine(_destinationDirectory, filepath));
			Process.Start(new ProcessStartInfo(_ajaxminiTool, "-comments:none -esc:true \"" + filepath + "\" -out \"" + filepath + "\"")
			{
				WindowStyle = ProcessWindowStyle.Hidden
			}).WaitForExit();

			Console.WriteLine("压缩完成");
		}

		static void RewriteModuleId(string filepath)
		{
			Console.Write("正在处理文件 {0}", filepath);

			filepath = Path.GetFullPath(Path.Combine(_destinationDirectory, filepath));
			var folder = Path.GetDirectoryName(filepath);

			var content = File.ReadAllText(filepath);

			//是否是模块？
			var depList = new List<string>();
			if (Regex.IsMatch(content, @"^[\r\n\s]*(define\()\s*(function\s*\()", RegexOptions.IgnoreCase))
			{
				var hash = GetModuleId(filepath);
				Console.WriteLine("正在处理...");
				Console.WriteLine("\t模块ID：{0}", hash);

				//替换内容，并获得所有的模块ID
				content = Regex.Replace(content, @"([\r\n=\s]require\s*\(\s*['""])([^'""]+)(['""]\))", _ =>
				{
					var path = Path.GetFullPath(Path.Combine(folder, _.Groups[2].Value));
					var id = GetModuleId(path);
					depList.Add(id);
					Console.WriteLine("\t依赖模块ID：{0}", id);
					return _.Groups[1].Value + id + _.Groups[3].Value;
				}, RegexOptions.IgnoreCase);

				content = Regex.Replace(content, @"^[\r\n\s]*(define\()\s*(function\s*\()", _ => _.Groups[1].Value + "\"" + hash + "\",[" + string.Join(",", depList.Select(s => "\"" + s + "\"")) + "]," + _.Groups[2].Value, RegexOptions.IgnoreCase);
			}
			else
			{
				Console.WriteLine("非模块，已跳过");
			}
			content = Regex.Replace(content, @"(seajs\.use\s*\(\s*['""])([^'""]+)(['""]\))", _ =>
			{
				var path = Path.GetFullPath(Path.Combine(folder, _.Groups[2].Value));
				var id = GetModuleId(path);
				depList.Add(id);
				Console.WriteLine("\t依赖模块ID：{0}", id);
				return _.Groups[1].Value + id + _.Groups[3].Value;
			}, RegexOptions.IgnoreCase);

			File.WriteAllText(filepath, content);
			Console.WriteLine("已处理完成");
		}

		static string GetModuleId(string path)
		{
			if (!path.EndsWith(".js", StringComparison.OrdinalIgnoreCase))
				path += ".js";

			if (_moduleMap.ContainsKey(path))
				return _moduleMap[path];

			var hash = string.Join("", MD5CryptoServiceProvider.Create().ComputeHash(Encoding.UTF8.GetBytes(path.ToLower())).Select(s => s.ToString("X2")).ToArray());
			_moduleMap.Add(path, hash);

			return hash;
		}

		static void ProcessCss(string cssfile)
		{
			Console.Write("正在处理 " + cssfile + "...");
			var content = ImportCssFile(cssfile);
			var fullPath = Path.Combine(_destinationDirectory, cssfile);

			//corrent reference
			content = Regex.Replace(content, @"url\(['""]?(?!data:)([^?'""]+?)(\?[^'""\)]*?)?['""]?\)", _ =>
			{
				var extag = _.Groups[2].Success ? _.Groups[2].Value : "";
				return "url(\"" + GetRelativePath(Path.GetDirectoryName(cssfile), GetTargetSubPath(_.Groups[1].Value)).Replace('\\', '/').ToLower() + extag + "\")";
			}, RegexOptions.IgnoreCase);

			File.WriteAllText(Path.Combine(_destinationDirectory, cssfile), content);
			Console.WriteLine("合并完成");

			Console.Write("正在压缩 " + cssfile + "...");
			Process.Start(new ProcessStartInfo(_ajaxminiTool, "-comments:none \"" + fullPath + "\" -out \"" + fullPath + "\"")
			{
				WindowStyle = ProcessWindowStyle.Hidden
			}).WaitForExit();

			Console.WriteLine("压缩完成");
		}

		static string GetRelativePath(string basePath, string secondPath)
		{
			if (string.IsNullOrEmpty(secondPath) || string.IsNullOrEmpty(basePath))
				return secondPath;

			var ps1 = basePath.Split(new[] { Path.DirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries);
			var ps2 = secondPath.Split(new[] { Path.DirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries);

			var upperBound = Math.Min(ps1.Length, ps2.Length);
			var startIndex = Enumerable.Range(0, upperBound).FirstOrDefault(s => string.Compare(ps1[s], ps2[s], true) != 0);

			if (startIndex == 0)
				return "/" + secondPath.Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
			if (ps1.Length == startIndex && ps2.Length <= startIndex)
				return "./";

			return string.Join(Path.AltDirectorySeparatorChar.ToString(), Enumerable.Repeat("..", ps1.Length - startIndex).Concat(ps2.Skip(startIndex)).ToArray());
		}

		static string GetProjectSubPath(string path)
		{
			var removeLength = _sourceDirectory.EndsWith("\\") ? _sourceDirectory.Length : _sourceDirectory.Length + 1;
			return path.Remove(0, removeLength);
		}

		static string GetTargetSubPath(string path)
		{
			var removeLength = _destinationDirectory.EndsWith("\\") ? _destinationDirectory.Length : _destinationDirectory.Length + 1;
			return path.Remove(0, removeLength);
		}

		/// <summary>
		/// 修正CSS文件引用路径
		/// </summary>
		/// <param name="filePath">要修正的css文件路径</param>
		/// <returns></returns>
		static string ImportCssFile(string filePath)
		{
			var fullPath = Path.Combine(_destinationDirectory, filePath);
			var content = File.ReadAllText(fullPath);
			var directory = Path.GetDirectoryName(fullPath);

			File.Delete(fullPath);

			//import
			content = Regex.Replace(content, @"@import\s+url\(['""]?(?!data:)([^?'""]+?)(\?[^'""\)]*?)?['""]?\);?", _ => ImportCssFile(Path.GetFullPath(Path.Combine(directory, _.Groups[1].Value.Replace('/', '\\')))), RegexOptions.IgnoreCase);

			//reference
			content = Regex.Replace(content, @"url\(['""]?(?!data:)([^?'""]+?)(\?[^'""\)]*?)?['""]?\)", _ =>
			{
				var extag = _.Groups[2].Success ? _.Groups[2].Value : "";
				var path = _.Groups[1].Value.Replace('/', '\\');
				if (path[0] == '\\')
					path = Path.Combine(_destinationDirectory, path.Remove(0, 1));
				else
					path = Path.Combine(directory, path);
				return string.Format("url(\"{0}{1}\")", Path.GetFullPath(path), extag);
			}, RegexOptions.IgnoreCase);

			return content;
		}

		static void CreateFileList()
		{
			var include = new[] { @".*\.*?\.(jpg|gif|png|html|js|svg|eot|ttf|woff|otf|css|ico)$" };
			var fileter = new[] { @"^(scripts|bin|app_data)\.*" };

			var allfiles = Directory.GetFiles(_sourceDirectory, "*.*", SearchOption.AllDirectories).ToDictionary(GetProjectSubPath, StringComparer.OrdinalIgnoreCase);

			//过滤
			_sourceFiles = allfiles.Where(s => include.Any(y => Regex.IsMatch(s.Key, y, RegexOptions.IgnoreCase)) && !fileter.Any(y => Regex.IsMatch(s.Key, y, RegexOptions.IgnoreCase)))
								.ToDictionary(s => s.Key, s => s.Value, StringComparer.OrdinalIgnoreCase);
		}

		static void CopySourceFiles()
		{
			foreach (var file in _sourceFiles)
			{
				Console.WriteLine("\t正在复制：{0}", file.Key);

				var target = Path.Combine(_destinationDirectory, file.Key).ToLower();
				Directory.CreateDirectory(Path.GetDirectoryName(target));
				File.Copy(file.Value, target);
			}
			Console.WriteLine("复制完成");
			Console.WriteLine();
		}
	}
}