// remote-container.ts
import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';
import * as vscode from 'vscode';
import * as rd from 'readline';
const { NodeSSH } = require('node-ssh');
const { spawn } = require('child_process');
const net = require('net');

import * as utils from './utils';
import User from './user';
import DevstarAPIHandler from './devstar-api';

export default class RemoteContainer {
  private user: User;
  private sshProcesses?: Map<string, any>;
  private portMappings: Map<string, Array<{ containerPort: number, localPort: number, label: string, source: string }>> = new Map();

  constructor(user: User) {
    this.user = user;
  }

  public setUser(user: User) {
    this.user = user;
  }

  /**
   * 第一次打开远程项目
   */
  async firstOpenProject(host: string, hostname: string, port: number, username: string, path: string, context: vscode.ExtensionContext) {
    if (vscode.env.remoteName) {
      try {
        await vscode.commands.executeCommand('workbench.action.terminal.newLocal');
        const terminal = vscode.window.terminals[vscode.window.terminals.length - 1];

        if (terminal) {
          let devstarDomain: string | undefined = context.globalState.get("devstarDomain_" + vscode.env.sessionId);
          if (devstarDomain == undefined || devstarDomain == "") {
            devstarDomain = undefined;
          }

          const semver = require('semver');
          const powershellVersion = context.globalState.get('powershellVersion');
          const powershell_semver_compatible_version = semver.coerce(powershellVersion);

          let command = '';
          if (devstarDomain === undefined) {
            if (powershellVersion === undefined) {
              command = `code --new-window && code --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}"`;
            } else if (semver.satisfies(powershell_semver_compatible_version, ">=5.1.26100")) {
              command = `code --new-window ; code --% --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}"`;
            } else {
              command = `code --new-window && code --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}"`;
            }
          } else {
            if (powershellVersion === undefined) {
              command = `code --new-window && code --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}&devstar_domain=${devstarDomain}"`;
            } else if (semver.satisfies(powershell_semver_compatible_version, ">=5.1.26100")) {
              command = `code --new-window ; code --% --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}&devstar_domain=${devstarDomain}"`;
            } else {
              command = `code --new-window && code --open-url "vscode://mengning.devstar/openProjectSkippingLoginCheck?host=${host}&hostname=${hostname}&port=${port}&username=${username}&path=${path}&devstar_domain=${devstarDomain}"`;
            }
          }

          terminal.sendText(command);
        } else {
          vscode.window.showErrorMessage('无法创建终端，请检查终端是否可用。');
        }
      } catch (error) {
        const errorMessage = error instanceof Error ? error.message : '未知错误';
        vscode.window.showErrorMessage(`远程环境操作失败: ${errorMessage}`);
      }
    } else {
      try {
        await this.firstConnect(host, hostname, username, port, path)
          .then((res) => {
            if (res === 'success') {
              this.openRemoteFolder(host, port, username, path, context);
            } else {
              vscode.window.showErrorMessage('首次连接容器失败，请检查网络和容器状态。');
            }
          })
          .catch(error => {
            const errorMessage = error instanceof Error ? error.message : '未知错误';
            vscode.window.showErrorMessage(`首次连接容器时发生错误: ${errorMessage}`);
          });
      } catch (error) {
        const errorMessage = error instanceof Error ? error.message : '未知错误';
        vscode.window.showErrorMessage(`打开项目失败: ${errorMessage}`);
      }
    }
  }

  /**
   * local environment，第一次连接其他项目
   */
  async firstConnect(host: string, hostname: string, _username: string, port: number, projectPath?: string): Promise<string> {
    return new Promise(async (resolve, reject) => {
      const ssh = new NodeSSH();

      vscode.window.withProgress({
        location: vscode.ProgressLocation.Notification,
        title: vscode.l10n.t("Installing vscode-server and devstar extension in container"),
        cancellable: false
      }, async (progress) => {
        try {
          if (!this.user.existUserPrivateKey() || !this.user.existUserPublicKey()) {
            await this.user.createUserSSHKey();

            const devstarAPIHandler = new DevstarAPIHandler();
            const uploadResult = await devstarAPIHandler.uploadUserPublicKey(this.user);
            if (uploadResult !== "ok") {
              throw new Error('Upload public key failed.');
            }
          }
        } catch (error) {
          reject(error);
          return;
        }

        try {
          await ssh.connect({
            host: hostname,
            username: 'root',
            port: port,
            privateKeyPath: this.user.getUserPrivateKeyPath(),
            readyTimeout: 30000,
            onKeyboardInteractive: (
              _name: string,
              _instructions: string,
              _instructionsLang: string,
              _prompts: any[],
              finish: (responses: string[]) => void
            ) => {
              finish([]);
            }
          });

          progress.report({ message: vscode.l10n.t("Connected! Start installation") });

          const vscodeCommitId = await utils.getVsCodeCommitId();

          if ("" !== vscodeCommitId) {
            const vscodeServerUrl = `https://vscode.download.prss.microsoft.com/dbazure/download/stable/${vscodeCommitId}/vscode-server-linux-x64.tar.gz`;
            const installVscodeServerScript = `
            mkdir -p ~/.vscode-server/bin/${vscodeCommitId} && \\
            if [ "$(ls -A ~/.vscode-server/bin/${vscodeCommitId})" ]; then
                echo "VSCode server already exists, installing extension only"
                ~/.vscode-server/bin/${vscodeCommitId}/bin/code-server --install-extension mengning.devstar
            else
                echo "Downloading and installing VSCode server"
                wget ${vscodeServerUrl} -O vscode-server-linux-x64.tar.gz && \\
                mv vscode-server-linux-x64.tar.gz ~/.vscode-server/bin/${vscodeCommitId} && \\
                cd ~/.vscode-server/bin/${vscodeCommitId} && \\
                tar -xvzf vscode-server-linux-x64.tar.gz --strip-components 1 && \\
                rm vscode-server-linux-x64.tar.gz && \\
                ~/.vscode-server/bin/${vscodeCommitId}/bin/code-server --install-extension mengning.devstar
            fi
            `;

            const installResult = await ssh.execCommand(installVscodeServerScript);

            if (installResult.code === 0) {
              vscode.window.showInformationMessage(vscode.l10n.t('Installation completed!'));
            } else {
              throw new Error(`Installation failed with exit code ${installResult.code}: ${installResult.stderr}`);
            }
          } else {
            throw new Error('Failed to get VSCode commit ID');
          }

          if (projectPath) {
          }

          await ssh.dispose();

          await this.storeProjectSSHInfo(host, hostname, port, 'root');

          resolve('success');
        } catch (error) {
          try {
            await ssh.dispose();
          } catch (disposeError) {
          }
          reject(error);
        }
      });
    });
  }

  /**
   * 查找可用的本地端口 - 优先使用相同端口
   */
  private async findAvailableLocalPort(containerPort: number): Promise<number> {
    if (await this.isPortAvailable(containerPort)) {
      return containerPort;
    }

    for (let offset = 1; offset <= 10; offset++) {
      const port1 = containerPort + offset;
      if (port1 < 65536 && await this.isPortAvailable(port1)) {
        return port1;
      }

      const port2 = containerPort - offset;
      if (port2 > 0 && await this.isPortAvailable(port2)) {
        return port2;
      }
    }

    return this.findRandomAvailablePort();
  }

  /**
   * 检查端口是否可用
   */
  private async isPortAvailable(port: number): Promise<boolean> {
    return new Promise((resolve) => {
      const server = net.createServer();
      server.unref();
      server.on('error', () => {
        resolve(false);
      });
      server.listen(port, () => {
        server.close(() => {
          resolve(true);
        });
      });
    });
  }

  /**
   * 查找随机可用端口
   */
  private async findRandomAvailablePort(): Promise<number> {
    return new Promise((resolve, reject) => {
      const server = net.createServer();
      server.unref();
      server.on('error', reject);
      server.listen(0, () => {
        const port = server.address().port;
        server.close(() => {
          resolve(port);
        });
      });
    });
  }

  /**
   * 创建 SSH 端口转发
   */
  private async createSSHPortForward(hostname: string, sshPort: number, containerPort: number, localPort: number): Promise<void> {
    return new Promise((resolve, reject) => {
      const sshArgs = [
        '-N',
        '-L',
        `${localPort}:localhost:${containerPort}`,
        '-o', 'StrictHostKeyChecking=no',
        '-o', 'UserKnownHostsFile=/dev/null',
        '-p', sshPort.toString(),
        '-i', this.user.getUserPrivateKeyPath(),
        `root@${hostname}`
      ];

      // 使用 detached 选项让 SSH 进程独立运行，不随父进程退出
      const sshProcess = spawn('ssh', sshArgs, {
        detached: true,  // 让进程在后台独立运行
        stdio: 'ignore'  // 忽略输入输出，避免进程挂起
      });

      // 解除父进程对子进程的引用，使其真正独立
      sshProcess.unref();

      sshProcess.on('error', (error: Error) => {
        reject(error);
      });

      // 由于使用了 stdio: 'ignore'，这些事件监听器不再需要
      // sshProcess.stdout.on('data', (data: Buffer) => {
      //   console.log(`[SSH stdout] ${data.toString()}`);
      // });

      // sshProcess.stderr.on('data', (data: Buffer) => {
      //   console.error(`[SSH stderr] ${data.toString()}`);
      // });

      // 注意：由于进程已 detached 和 unref，不再需要保存到 sshProcesses Map
      // 因为我们无法也不需要控制这些独立进程的生命周期

      // 等待 SSH 连接建立
      setTimeout(() => {
        resolve();
      }, 2000);
    });
  }

  /**
   * 显示端口映射汇总信息
   */
  private showPortMappingsSummary(portMappings: Array<{ containerPort: number, localPort: number, label: string, source: string }>): void {
    let message = `🎯 已建立 ${portMappings.length} 个端口映射：\n\n`;

    portMappings.forEach(mapping => {
      const samePort = mapping.containerPort === mapping.localPort ? " ✅" : " 🔄";
      message += `• ${mapping.label}\n`;
      message += `  容器端口: ${mapping.containerPort} → 本地端口: ${mapping.localPort}${samePort}\n`;
      message += `  访问地址: http://localhost:${mapping.localPort}\n`;
      message += `  配置来源: ${mapping.source}\n\n`;
    });

    vscode.window.showInformationMessage(message, '复制映射信息', '在浏览器中打开', '查看详细信息')
      .then(selection => {
        if (selection === '复制映射信息') {
          const copyText = portMappings.map(m =>
            `${m.label}: http://localhost:${m.localPort} (容器端口: ${m.containerPort})`
          ).join('\n');
          vscode.env.clipboard.writeText(copyText);
          vscode.window.showInformationMessage('端口映射信息已复制到剪贴板');
        } else if (selection === '在浏览器中打开' && portMappings.length > 0) {
          vscode.env.openExternal(vscode.Uri.parse(`http://localhost:${portMappings[0].localPort}`));
        } else if (selection === '查看详细信息') {
        }
      });
  }


  /**
   * 本地环境，保存项目的ssh连接信息
   */
  async storeProjectSSHInfo(host: string, hostname: string, port: number, username: string): Promise<void> {
    const sshConfigPath = path.join(os.homedir(), '.ssh', 'config');

    let canAppendSSHConfig = true;
    if (fs.existsSync(sshConfigPath)) {
      const reader = rd.createInterface(fs.createReadStream(sshConfigPath));

      for await (const line of reader) {
        if (line.includes(`Host ${host}`)) {
          canAppendSSHConfig = false;
          break;
        }
      }
    }

    if (canAppendSSHConfig) {
      const privateKeyPath = this.user.getUserPrivateKeyPath();

      const newSShConfigContent =
        `\nHost ${host}\n  HostName ${hostname}\n  Port ${port}\n  User ${username}\n  PreferredAuthentications publickey\n  IdentityFile ${privateKeyPath}\n  `;

      try {
        fs.writeFileSync(sshConfigPath, newSShConfigContent, { encoding: 'utf8', flag: 'a' });
      } catch (error) {
        throw error;
      }
    }
  }

  /**
   * local env
   */
  async openRemoteFolder(host: string, port: number, _username: string, path: string, context: vscode.ExtensionContext): Promise<void> {
    try {
      const sshConfig = await this.getSSHConfig(host);

      if (sshConfig) {
        try {
          // 调用 setupPortForwardingFromGlobalState 方法
          await this.setupPortForwardingFromGlobalState(sshConfig.hostname, port, context);

        } catch (portError) {
          vscode.window.showWarningMessage('端口映射设置失败，但容器连接已建立');
        }
      }

      let terminal = vscode.window.activeTerminal || vscode.window.createTerminal(`Ext Terminal`);
      terminal.show(true);

      const command = `code --remote ssh-remote+root@${host}:${port} ${path} --reuse-window`;

      terminal.sendText(command);

    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : '未知错误';
      vscode.window.showErrorMessage(`打开远程文件夹失败: ${errorMessage}`);
    }
  }

  /**
   * 从 SSH config 获取主机配置
   */
  private async getSSHConfig(host: string): Promise<{ hostname: string; port: number } | null> {
    const sshConfigPath = path.join(os.homedir(), '.ssh', 'config');

    if (!fs.existsSync(sshConfigPath)) {
      return null;
    }

    const configContent = fs.readFileSync(sshConfigPath, 'utf8');
    const lines = configContent.split('\n');

    let currentHost = '';
    let hostname = '';
    let port = 22;

    for (const line of lines) {
      const trimmed = line.trim();

      if (trimmed.startsWith('Host ')) {
        currentHost = trimmed.substring(5).trim();
      } else if (currentHost === host) {
        if (trimmed.startsWith('HostName ')) {
          hostname = trimmed.substring(9).trim();
        } else if (trimmed.startsWith('Port ')) {
          port = parseInt(trimmed.substring(5).trim());
        }
      }

      if (hostname && currentHost === host) {
        return { hostname, port };
      }
    }

    return null;
  }


  /**
   * 从 globalState 获取 forwardPorts 并建立端口映射
   */
  public async setupPortForwardingFromGlobalState(hostname: string, port: number, context: vscode.ExtensionContext): Promise<void> {
    // 从 globalState 获取 forwardPorts 参数
    const forwardPorts: number[] | undefined = context.globalState.get('forwardPorts');

    if (forwardPorts && forwardPorts.length > 0) {
      const portMappings: Array<{ containerPort: number, localPort: number, label: string, source: string }> = [];

      for (const containerPort of forwardPorts) {
        const localPort = await this.findAvailableLocalPort(containerPort);
        try {
          await this.createSSHPortForward(hostname, port, containerPort, localPort);
          portMappings.push({
            containerPort,
            localPort,
            label: `Port ${containerPort}`,
            source: 'globalState forwardPorts'
          });
        } catch (error) {
          console.error(`映射容器端口 ${containerPort} 到本地端口 ${localPort} 失败:`, error);
        }
      }

      const mappingKey = `${hostname}:${port}`;
      this.portMappings.set(mappingKey, portMappings);

      if (portMappings.length > 0) {
        this.showPortMappingsSummary(portMappings);
      }

      // 使用完毕后立即清除 globalState 中的 forwardPorts，避免影响下一个项目
      console.log('端口映射完成，清除 globalState 中的 forwardPorts');
      context.globalState.update('forwardPorts', undefined);
    } else {
      console.log('未找到 forwardPorts 参数，跳过端口映射设置。');
    }
  }
}

/**
 * 打开项目（无须插件登录）
 */
export async function openProjectWithoutLogging(hostname: string, port: number, username: string, path: string): Promise<void> {
  const command = `code --remote ssh-remote+${username}@${hostname}:${port} ${path} --reuse-window`;

  try {
    let terminal = vscode.window.activeTerminal || vscode.window.createTerminal(`Ext Terminal`);
    terminal.show(true);
    terminal.sendText(command);
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : '未知错误';
    vscode.window.showErrorMessage(`无登录打开项目失败: ${errorMessage}`);
  }
}