# All files server-manager.ts

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76.05% Branches 54/71
85.29% Functions 29/34
90.27% Lines 167/185

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     import { spawn, spawnSync, ChildProcess } from 'child_process';
    import { app } from 'electron';
    import * as path from 'path';
    import * as fs from 'fs';

    export interface PrerequisiteResult {
      ok: boolean;
      error?: string;
      needsInstall?: boolean;
    }

    // Check if this is a nightly build (version contains 'nightly' or commit hash)
    function isNightlyBuild(): boolean {
      const version = app.getVersion();
      return version.includes('nightly') || version.includes('-') || !version.match(/^\d+\.\d+\.\d+$/);
    }

    export class ServerManager {
      private process: ChildProcess | null = null;
      private stopping = false;
      private stopped = false;
      private stopPromise: Promise<void> | null = null;

      /**
       * Clean up all listeners from the child process and reset state.
       */
      private cleanup(): void {
        Eif (this.process) {
          this.process.stdout?.removeAllListeners();
          this.process.stderr?.removeAllListeners();
          this.process.removeAllListeners();
          this.process = null;
        }
      }

      /**
       * Get the path to the bundled mehr binary (macOS/Linux only).
       */
      private getMehrPath(): string {
        Iif (app.isPackaged) {
          // In packaged app: resources/bin/mehr
          return path.join(process.resourcesPath, 'bin', 'mehr');
        } else {
          // In dev: look in desktop/resources/bin/ or fall back to PATH
          const devPath = path.join(__dirname, '../../resources/bin', 'mehr');
          if (fs.existsSync(devPath)) {
            return devPath;
          }
          return 'mehr'; // Fall back to PATH for dev
        }
      }

      /**
       * Preflight check - call on app startup.
       * - macOS/Linux: Check bundled binary exists
       * - Windows: Check WSL exists, auto-install mehr if missing
       */
      checkPrerequisites(): PrerequisiteResult {
        const isWindows = process.platform === 'win32';

        if (isWindows) {
          return this.checkWindowsPrerequisites();
        } else {
          return this.checkUnixPrerequisites();
        }
      }

      private checkUnixPrerequisites(): PrerequisiteResult {
        const mehrPath = this.getMehrPath();

        // In dev mode with fallback to PATH, check if mehr exists
        if (mehrPath === 'mehr') {
          const check = spawnSync('which', ['mehr'], { stdio: 'pipe' });
          if (check.status !== 0) {
            return {
              ok: false,
              error: 'mehr binary not found.\n\nThis is a development build issue.',
            };
          }
        I} else if (!fs.existsSync(mehrPath)) {
          return {
            ok: false,
            error: 'Bundled mehr binary not found.\n\nPlease reinstall the application.',
          };
        }

        return { ok: true };
      }

      private checkWindowsPrerequisites(): PrerequisiteResult {
        // Check WSL availability
        const wslCheck = spawnSync('wsl', ['--version'], { stdio: 'pipe' });
        if (wslCheck.status !== 0) {
          return {
            ok: false,
            error: 'WSL is not installed.\n\nPlease install WSL2:\nhttps://learn.microsoft.com/en-us/windows/wsl/install',
          };
        }

        // Check if mehr is installed in WSL
        const mehrCheck = spawnSync('wsl', ['which', 'mehr'], { stdio: 'pipe' });
        if (mehrCheck.status !== 0) {
          // mehr not found - needs auto-install
          return { ok: true, needsInstall: true };
        }

        return { ok: true };
      }

      /**
       * Auto-install mehr in WSL (Windows only).
       * Uses the install script with --nightly flag if this is a nightly build.
       */
      async installMehrInWSL(): Promise<void> {
        const nightlyFlag = isNightlyBuild() ? ' -s -- --nightly' : '';
        const installCmd = `curl -fsSL https://raw.githubusercontent.com/valksor/go-mehrhof/master/install.sh | bash${nightlyFlag}`;

        return new Promise((resolve, reject) => {
          const proc = spawn('wsl', ['bash', '-c', installCmd], {
            stdio: ['ignore', 'pipe', 'pipe'],
          });

          let stderr = '';

          proc.stderr?.on('data', (data: Buffer) => {
            stderr += data.toString();
          });

          proc.on('exit', (code) => {
            if (code === 0) {
              resolve();
            } else {
              reject(new Error(`Failed to install mehr in WSL:\n${stderr}`));
            }
          });

          proc.on('error', (err) => {
            reject(new Error(`Failed to run install script: ${err.message}`));
          });
        });
      }

      /**
       * Start mehr serve in global mode.
       * Shows project picker UI.
       * @returns The port number mehr is listening on.
       */
      async startGlobal(): Promise<number> {
        // Stop any existing process first
        await this.stop();
        this.stopped = false; // Reset for new server instance

        const isWindows = process.platform === 'win32';

        let cmd: string;
        let args: string[];

        if (isWindows) {
          cmd = 'wsl';
          args = ['mehr', 'serve', '--global', '--port', '0'];
        } else {
          cmd = this.getMehrPath();
          args = ['serve', '--global', '--port', '0'];
        }

        return new Promise((resolve, reject) => {
          this.process = spawn(cmd, args, { shell: false });
          let resolved = false;

          const timeout = setTimeout(() => {
            if (!resolved) {
              resolved = true;
              removeListeners();
              reject(new Error('Server startup timed out after 30 seconds.'));
            }
          }, 30000);

          // Define named listeners for proper cleanup
          const onStdout = (data: Buffer) => {
            const match = data.toString().match(/localhost:(\d+)/);
            Eif (match && !resolved) {
              resolved = true;
              clearTimeout(timeout);
              // Keep stderr listener for logging, remove startup listeners
              this.process?.off('error', onError);
              this.process?.off('exit', onExit);
              this.process?.stdout?.off('data', onStdout);
              resolve(parseInt(match[1], 10));
            }
          };

          const onStderr = (data: Buffer) => {
            console.error('[mehr stderr]', data.toString());
          };

          const onError = (err: Error) => {
            Eif (!resolved) {
              resolved = true;
              clearTimeout(timeout);
              removeListeners();
              this.cleanup();
              reject(new Error(`Failed to start mehr: ${err.message}`));
            }
          };

          const onExit = (code: number | null) => {
            Eif (!resolved && code !== 0 && code !== null) {
              resolved = true;
              clearTimeout(timeout);
              removeListeners();
              this.cleanup();
              reject(new Error(`mehr exited with code ${code}`));
            }
          };

          const removeListeners = () => {
            this.process?.stdout?.off('data', onStdout);
            this.process?.stderr?.off('data', onStderr);
            this.process?.off('error', onError);
            this.process?.off('exit', onExit);
          };

          this.process.stdout?.on('data', onStdout);
          this.process.stderr?.on('data', onStderr);
          this.process.on('error', onError);
          this.process.on('exit', onExit);
        });
      }

      /**
       * Start mehr serve for a project.
       * Uses random port (--port 0) to avoid conflicts.
       * @returns The port number mehr is listening on.
       */
      async start(projectPath: string): Promise<number> {
        // Stop any existing process first
        await this.stop();
        this.stopped = false; // Reset for new server instance

        const isWindows = process.platform === 'win32';

        // Validate path
        const validation = this.validatePath(projectPath);
        if (!validation.ok) {
          throw new Error(validation.error);
        }

        let cmd: string;
        let args: string[];
        let cwd: string | undefined;

        if (isWindows) {
          // Convert Windows path → WSL path, use cd to set working directory
          const wslPath = this.toWslPath(projectPath);
          cmd = 'wsl';
          args = ['bash', '-c', `cd '${wslPath}' && mehr serve --port 0`];
          cwd = undefined;
        } else {
          cmd = this.getMehrPath();
          args = ['serve', '--port', '0'];
          cwd = projectPath;
        }

        return new Promise((resolve, reject) => {
          this.process = spawn(cmd, args, { cwd, shell: false });
          let resolved = false;

          const timeout = setTimeout(() => {
            if (!resolved) {
              resolved = true;
              removeListeners();
              reject(
                new Error(
                  'Server startup timed out after 30 seconds.\n\nCheck that mehr is working: mehr --version'
                )
              );
            }
          }, 30000);

          // Define named listeners for proper cleanup
          const onStdout = (data: Buffer) => {
            const match = data.toString().match(/localhost:(\d+)/);
            Eif (match && !resolved) {
              resolved = true;
              clearTimeout(timeout);
              // Keep stderr listener for logging, remove startup listeners
              this.process?.off('error', onError);
              this.process?.off('exit', onExit);
              this.process?.stdout?.off('data', onStdout);
              resolve(parseInt(match[1], 10));
            }
          };

          const onStderr = (data: Buffer) => {
            console.error('[mehr stderr]', data.toString());
          };

          const onError = (err: Error) => {
            Eif (!resolved) {
              resolved = true;
              clearTimeout(timeout);
              removeListeners();
              this.cleanup();
              reject(new Error(`Failed to start mehr: ${err.message}`));
            }
          };

          const onExit = (code: number | null) => {
            if (!resolved && code !== 0 && code !== null) {
              resolved = true;
              clearTimeout(timeout);
              removeListeners();
              this.cleanup();
              reject(new Error(`mehr exited with code ${code}`));
            }
          };

          const removeListeners = () => {
            this.process?.stdout?.off('data', onStdout);
            this.process?.stderr?.off('data', onStderr);
            this.process?.off('error', onError);
            this.process?.off('exit', onExit);
          };

          this.process.stdout?.on('data', onStdout);
          this.process.stderr?.on('data', onStderr);
          this.process.on('error', onError);
          this.process.on('exit', onExit);
        });
      }

      /**
       * Validate a project path.
       * Rejects UNC paths on Windows.
       */
      private validatePath(winPath: string): PrerequisiteResult {
        if (process.platform === 'win32') {
          // Reject network paths (UNC)
          if (winPath.startsWith('\\\\')) {
            return {
              ok: false,
              error: 'Network paths (\\\\server\\share) are not supported.\n\nPlease use a local drive.',
            };
          }
          // Validate drive letter format
          if (!/^[A-Za-z]:\\/.test(winPath)) {
            return {
              ok: false,
              error: 'Invalid path format.\n\nExpected: C:\\path\\to\\project',
            };
          }
        }
        return { ok: true };
      }

      /**
       * Convert Windows path to WSL path.
       * C:\Users\foo -> /mnt/c/Users/foo
       */
      private toWslPath(winPath: string): string {
        return winPath
          .replace(/^([A-Za-z]):\\/, (_, drive: string) => `/mnt/${drive.toLowerCase()}/`)
          .replace(/\\/g, '/');
      }

      /**
       * Graceful shutdown: SIGTERM -> wait 5s -> SIGKILL.
       * Safe to call multiple times - subsequent calls wait for the first to complete.
       */
      async stop(): Promise<void> {
        // Already stopped
        if (this.stopped || !this.process) return;

        // If already stopping, wait for that operation to complete
        if (this.stopping && this.stopPromise) {
          return this.stopPromise;
        }

        this.stopping = true;
        const proc = this.process;

        this.stopPromise = new Promise((resolve) => {
          const forceKill = setTimeout(() => {
            proc.kill('SIGKILL');
            this.cleanup();
            this.stopping = false;
            this.stopped = true;
            this.stopPromise = null;
            resolve();
          }, 5000);

          // Use once() to auto-remove listener after first call
          proc.once('exit', () => {
            clearTimeout(forceKill);
            this.cleanup();
            this.stopping = false;
            this.stopped = true;
            this.stopPromise = null;
            resolve();
          });

          proc.kill('SIGTERM');
        });

        return this.stopPromise;
      }
    }