using GitLib = LibGit2Sharp;

namespace Common
{
    public class GitHelper
    {
        private readonly string _repoPath;

        public GitHelper(string repoPath)
        {
            _repoPath = Path.GetFullPath(repoPath);
            if (!Directory.Exists(_repoPath))
                Directory.CreateDirectory(_repoPath);
        }

        // 1. 是否是 Git 仓库（替代 IsGitRepo）
        public bool IsGitRepository()
        {
            // 静态方法：Discover
            return GitLib.Repository.Discover(_repoPath) != null;
        }

        // 2. 初始化仓库（git init）
        public bool InitRepository()
        {
            // if (IsGitRepository()) return true;
            GitLib.Repository.Init(_repoPath);
            return true;
        }

        // 3. 克隆远程仓库
        public bool Clone(string remoteUrl, string userName, string token, string targetBranch = null)
        {
            try
            {
                var cloneOpt = new GitLib.CloneOptions();
                if (!string.IsNullOrEmpty(targetBranch))
                    cloneOpt.BranchName = targetBranch;

                // 配置凭证回调（解决认证报错）
                cloneOpt.FetchOptions.CredentialsProvider = (url, user, credType) =>
                {
                    return new GitLib.UsernamePasswordCredentials
                    {
                        Username = userName,
                        Password = token
                    };
                };

                GitLib.Repository.Clone(remoteUrl, _repoPath, cloneOpt);
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"克隆仓库失败：{ex.Message}");
                return false;
            }
        }

        // 4. Stage 文件（git add .）→ 用 Commands.Stage
        public bool StageAll()
        {
            if (!IsGitRepository()) return false;

            using var repo = new GitLib.Repository(_repoPath);
            GitLib.Commands.Stage(repo, "*"); // 静态方法，不是实例方法
            return true;
        }

        // 5. Commit（git commit -m）
        public bool Commit(string message, string name = "Admin", string email = "admin@example.com")
        {
            if (!IsGitRepository()) return false;

            using var repo = new GitLib.Repository(_repoPath);
            var sig = new GitLib.Signature(name, email, DateTime.Now);
            repo.Commit(message, sig, sig, new GitLib.CommitOptions()); // 实例方法，存在
            return true;
        }

        // 6. Pull（git pull）→ 用 Commands.Pull
        public bool PullCode(string userName, string token, string userNameCommit = "TestUser", string userEmail = "test@demo.com")
        {
            try
            {
                using var repo = new GitLib.Repository(_repoPath);

                var sign = new GitLib.Signature(userNameCommit, userEmail, DateTime.Now);
                var pullOpt = new GitLib.PullOptions
                {
                    FetchOptions = new GitLib.FetchOptions
                    {
                        // 拉取凭证（解决私有仓库认证）
                        CredentialsProvider = (url, user, credType) =>
                        {
                            return new GitLib.UsernamePasswordCredentials
                            {
                                Username = userName,
                                Password = token
                            };
                        }
                    }
                };

                GitLib.Commands.Pull(repo, sign, pullOpt);
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"拉取代码失败：{ex.Message}");
                return false;
            }
        }

        // 7. Push（git push）
        public bool Push(string userName, string token, string branch = "main")
        {
            if (!IsGitRepository()) return false;

            using var repo = new GitLib.Repository(_repoPath);
            var cred = new GitLib.UsernamePasswordCredentials
            {
                Username = userName,
                Password = token // GitHub/Gitee 用 Token
            };

            var pushOpts = new GitLib.PushOptions
            {
                CredentialsProvider = (_, _, _) => cred
            };

            var targetBranch = repo.Branches[branch] ?? throw new Exception("分支不存在");
            repo.Network.Push(targetBranch, pushOpts);
            return true;
        }
    }
}