using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;

namespace SKMC.Api.Common.Version
{
    public class RuntimeVersionProvider
    {
        /// <summary>
        /// 获取模块版本信息
        /// </summary>
        /// <param name="directory">路径</param>
        /// <returns></returns>
        public ModuleVersion GetModuleVersion(string directory)
        {
            if (!Directory.Exists(directory))
                return new ModuleVersion { Name = Path.GetFileName(directory) };

            var commit = GitCommandHelper.Run(directory, "rev-parse HEAD");
            var branch = GitCommandHelper.Run(directory, "rev-parse --abbrev-ref HEAD");
            var author = GitCommandHelper.Run(directory, "log -1 --format=%an");
            var time = GitCommandHelper.Run(directory, "log -1 --format=%ci");
            var msg = GitCommandHelper.Run(directory, "log -1 --format=%s");
            var dirty = !string.IsNullOrEmpty(GitCommandHelper.Run(directory, "status --porcelain", noCache: true));

            DateTime.TryParse(time?.Split('+')[0]?.Trim(), out var commitTime);
            var moduleVersion = new ModuleVersion
            {
                Name = Path.GetFileName(directory),
                CommitHash = commit,
                Branch = branch,
                Author = author,
                CommitTime = commitTime,
                CommitMessage = msg,
                HasUncommittedChanges = dirty,
                Path = directory,
                AssemblyFileVersion = GetAssemblyVersion(directory)
            };
            return moduleVersion;
        }
        /// <summary>
        /// 获取项目版本
        /// </summary>
        /// <param name="rootDir"></param>
        /// <returns></returns>
        public ProjectVersion GetProjectVersions(string rootDir)
        {
            var project = new ProjectVersion
            {
                ProjectName = Path.GetFileName(rootDir),
                BuildTime = DateTime.Now,
                RootCommitHash = GitCommandHelper.Run(rootDir, "rev-parse HEAD")
            };

            foreach (var dir in Directory.GetDirectories(rootDir))
            {
                var folderName = Path.GetFileName(dir);
                // 过滤文件
                if (folderName.Equals(".git") || folderName.Equals("packages") || folderName.Equals("bin") || folderName.Equals("obj"))
                    continue;
                // 查找是否存在csproj格式文件
                if (Directory.GetFiles(dir, "*.csproj", SearchOption.TopDirectoryOnly).Length > 0)
                {
                    project.Modules.Add(GetModuleVersion(dir));
                }
            }

            return project;
        }

        public string FindGitRoot(string startDir)
        {
            try
            {
                var dir = new DirectoryInfo(startDir);
                while (dir != null)
                {
                    if (Directory.Exists(Path.Combine(dir.FullName, ".git")))
                        return dir.FullName;
                    dir = dir.Parent;
                }
            }
            catch { }
            return null;
        }
        private string GetAssemblyVersion(string modulePath)
        {
            try
            {
                var moduleName = Path.GetFileName(modulePath);
                var dllPath = Path.Combine(Path.GetDirectoryName(AppContext.BaseDirectory), $"{moduleName}.dll");
                var exePath = Path.Combine(Path.GetDirectoryName(AppContext.BaseDirectory), $"{moduleName}.exe");

                if (!System.IO.File.Exists(dllPath) && !System.IO.File.Exists(exePath))
                    return "unknown";

                var path = new[] { exePath, dllPath }.FirstOrDefault(System.IO.File.Exists);
                var assembly = Assembly.LoadFrom(path);
                var informationalVersion = assembly.GetCustomAttributesData()
                    .FirstOrDefault(a => a.AttributeType == typeof(AssemblyInformationalVersionAttribute))?
                    .ConstructorArguments.FirstOrDefault().Value?.ToString();

                if (!string.IsNullOrEmpty(informationalVersion))
                    return informationalVersion;

                return $"{assembly.GetName().Version}";
            }
            catch
            {
                return "unknown";
            }
        }
    }
}