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

namespace SKMC.Api.Common.Version
{
    public static class VersionHelper
    {
        private static readonly RuntimeVersionProvider _provider = new RuntimeVersionProvider();
        private static readonly Dictionary<string, ProjectVersion> projectsCacher = new Dictionary<string, ProjectVersion>();
        /// <summary>
        /// 获取当前工程/项目版本
        /// </summary>
        /// <param name="rootDirectory"></param>
        /// <returns></returns>
        public static ProjectVersion GetCurrentProjectVersion(string rootDirectory)
        {
            try
            {
                var gitRoot = _provider.FindGitRoot(rootDirectory);
                if (string.IsNullOrEmpty(gitRoot))
                {
                    return new ProjectVersion { ErrorMessage = "未找到Git仓库" };
                }
                else
                {
                    var pro = GetFullProjectInfo(gitRoot);
                    projectsCacher.Add(pro.ProjectName, pro);
                    return pro;
                }
            }
            catch (Exception ex)
            {
                return new ProjectVersion { ErrorMessage = ex.Message };
            }
        }

        /// <summary>
        /// 获取整个项目的版本信息
        /// </summary>
        /// <param name="rootPath"></param>
        /// <returns></returns>
        public static ProjectVersion GetFullProjectInfo(string rootPath)
        {
            var project = _provider.GetProjectVersions(rootPath);
            GetDependencyResolve(project);
            return project;
        }

        //public static string GetMainGitVersion()
        //{
        //    var p = GetCurrentProjectVersion();
        //    var hash = string.IsNullOrEmpty(p?.RootCommitHash)
        //        ? "unknown"
        //        : p.RootCommitHash.Substring(0, 7);

        //    return $"1.0.0.git{hash}";
        //}

        /// <summary>
        /// 通过检索csproj文件，获取模块依赖信息
        /// </summary>
        /// <param name="project"></param>
        public static void GetDependencyResolve(ProjectVersion project)
        {
            var moduleMap = project.Modules.ToDictionary(m => m.Name.ToLower());

            foreach (var module in project.Modules)
            {
                var csproj = Directory.GetFiles(module.Path, "*.csproj").FirstOrDefault();
                if (csproj == null) continue;

                var doc = XDocument.Load(csproj);
                XNamespace ns = "http://schemas.microsoft.com/developer/msbuild/2003";

                var refs = doc.Descendants(ns + "ProjectReference")
                    .Select(x => x.Attribute("Include")?.Value)
                    .Where(x => !string.IsNullOrEmpty(x))
                    .ToList();

                List<string> depy = new List<string>();
                List<string> depb = new List<string>();
                foreach (var rel in refs)
                {
                    var name = Path.GetFileNameWithoutExtension(rel).ToLower();
                    if (moduleMap.TryGetValue(name, out var dep))
                    {
                        if (!module.Dependencies.Contains(dep.Name))
                            depy.Add(dep.Name);

                        if (!dep.DependedBy.Contains(module.Name))
                            depb.Add(module.Name);
                    }
                }
                module.Dependencies = string.Join(",", depy);
                module.DependedBy = string.Join(",", depb);
            }
        }
        /// <summary>
        /// 模块合并
        /// </summary>
        public static ProjectVersion ModuleMerge()
        {
            var project = new ProjectVersion
            {
                BuildTime = DateTime.Now
            };
            foreach (var proj in projectsCacher)
            {
                project.ProjectName += proj.Value.ProjectName + "/";
                project.ErrorMessage += proj.Value.ErrorMessage;
                project.Modules.AddRange(proj.Value.Modules);
            }
            return project;
        }

        /// <summary>
        /// 生成文本
        /// </summary>
        /// <param name="project"></param>
        /// <returns></returns>
        public static string GenerateText(ProjectVersion project)
        {
            var sb = new StringBuilder();
            sb.AppendLine($"项目：{project.ProjectName}");
            sb.AppendLine($"根版本：{project.RootCommitHash?.Substring(0, 7) ?? "unknown"}");
            sb.AppendLine();

            foreach (var m in project.Modules)
            {
                sb.AppendLine($"模块：{m.Name}");
                sb.AppendLine($"版本：{m.CommitTime.ToString("yyMMddHHmmss")}.{m.ShortVersion}");
                sb.AppendLine($"依赖：{string.Join(", ", m.Dependencies)}");
                sb.AppendLine($"被依赖：{string.Join(", ", m.DependedBy)}");
                sb.AppendLine($"DLL 文件版本：{m.AssemblyFileVersion}");
                sb.AppendLine($"Message：{m.CommitMessage}");
                sb.AppendLine($"作者：{m.Author}");
                sb.AppendLine();
            }

            return sb.ToString();
        }
    }
}