Extension Points

/**
 * Extension point for custom workspace opening handlers
 */
interface WorkspaceOpenHandlerContribution {
  /**
   * Check if this handler can handle the given URI
   * @param uri - URI to check for handling capability
   */
  canHandle(uri: URI): MaybePromise<boolean>;
  
  /**
   * Open workspace with the given URI and options
   * @param uri - URI of the workspace to open
   * @param options - Optional workspace input parameters
   */
  openWorkspace(uri: URI, options?: WorkspaceInput): MaybePromise<void>;
  
  /**
   * Get workspace label for display purposes (optional)
   * @param uri - URI of the workspace
   */
  getWorkspaceLabel?(uri: URI): MaybePromise<string | undefined>;
}

import { injectable, inject } from "@theia/core/shared/inversify";
import { WorkspaceOpenHandlerContribution, WorkspaceInput } from "@theia/workspace/lib/browser";
import URI from "@theia/core/lib/common/uri";
import { MaybePromise } from "@theia/core";

@injectable()
export class RemoteWorkspaceOpenHandler implements WorkspaceOpenHandlerContribution {

  canHandle(uri: URI): MaybePromise<boolean> {
    // Handle custom remote workspace schemes
    return uri.scheme === 'ssh' || uri.scheme === 'ftp' || uri.scheme === 'git';
  }

  async openWorkspace(uri: URI, options?: WorkspaceInput): Promise<void> {
    console.log(`Opening remote workspace: ${uri}`);
    
    if (uri.scheme === 'git') {
      await this.openGitWorkspace(uri, options);
    } else if (uri.scheme === 'ssh') {
      await this.openSshWorkspace(uri, options);
    } else if (uri.scheme === 'ftp') {
      await this.openFtpWorkspace(uri, options);
    }
  }

  getWorkspaceLabel(uri: URI): MaybePromise<string | undefined> {
    // Provide custom labels for remote workspaces
    switch (uri.scheme) {
      case 'git':
        return `Git: ${uri.path.base}`;
      case 'ssh':
        return `SSH: ${uri.authority}${uri.path}`;
      case 'ftp':
        return `FTP: ${uri.authority}${uri.path}`;
      default:
        return undefined;
    }
  }

  private async openGitWorkspace(uri: URI, options?: WorkspaceInput): Promise<void> {
    // Implementation for opening Git repositories as workspaces
    console.log("Cloning and opening Git workspace...");
    // 1. Clone repository to local temp directory
    // 2. Open local directory as workspace
    // 3. Set up Git integration
  }

  private async openSshWorkspace(uri: URI, options?: WorkspaceInput): Promise<void> {
    // Implementation for SSH remote workspaces
    console.log("Connecting to SSH workspace...");
    // 1. Establish SSH connection
    // 2. Mount remote filesystem
    // 3. Open mounted directory as workspace
  }

  private async openFtpWorkspace(uri: URI, options?: WorkspaceInput): Promise<void> {
    // Implementation for FTP workspaces
    console.log("Connecting to FTP workspace...");
    // 1. Establish FTP connection
    // 2. Create virtual filesystem
    // 3. Open as workspace
  }
}

// Register the handler in your module
export default new ContainerModule(bind => {
  bind(WorkspaceOpenHandlerContribution).to(RemoteWorkspaceOpenHandler).inSingletonScope();
});

/**
 * Backend extension point for custom workspace handlers
 */
interface WorkspaceHandlerContribution {
  /**
   * Check if this handler can handle the given URI scheme/format
   * @param uri - URI to check for handling capability
   */
  canHandle(uri: URI): boolean;
  
  /**
   * Check if the workspace still exists and is accessible
   * @param uri - URI of the workspace to validate
   */
  workspaceStillExists(uri: URI): Promise<boolean>;
}

/**
 * Default file system workspace handler
 */
class FileWorkspaceHandlerContribution implements WorkspaceHandlerContribution {
  /**
   * Handles file:// scheme URIs
   */
  canHandle(uri: URI): boolean;
  
  /**
   * Check if file/directory exists on disk
   */
  workspaceStillExists(uri: URI): Promise<boolean>;
}

import { injectable, inject } from "@theia/core/shared/inversify";
import { WorkspaceHandlerContribution } from "@theia/workspace/lib/node";
import URI from "@theia/core/lib/common/uri";

@injectable()
export class DatabaseWorkspaceHandler implements WorkspaceHandlerContribution {

  @inject(DatabaseConnectionService)
  protected readonly dbService: DatabaseConnectionService;

  canHandle(uri: URI): boolean {
    // Handle database workspace schemes
    return uri.scheme === 'mysql' || uri.scheme === 'postgres' || uri.scheme === 'mongodb';
  }

  async workspaceStillExists(uri: URI): Promise<boolean> {
    try {
      switch (uri.scheme) {
        case 'mysql':
          return await this.checkMysqlWorkspace(uri);
        case 'postgres':
          return await this.checkPostgresWorkspace(uri);
        case 'mongodb':
          return await this.checkMongoWorkspace(uri);
        default:
          return false;
      }
    } catch (error) {
      console.error(`Failed to check database workspace ${uri}:`, error);
      return false;
    }
  }

  private async checkMysqlWorkspace(uri: URI): Promise<boolean> {
    // Check if MySQL database/schema exists
    const connection = await this.dbService.connect(uri);
    try {
      const exists = await connection.query(`SHOW DATABASES LIKE '${uri.path.base}'`);
      return exists.length > 0;
    } finally {
      await connection.close();
    }
  }

  private async checkPostgresWorkspace(uri: URI): Promise<boolean> {
    // Check if PostgreSQL database exists
    const connection = await this.dbService.connect(uri);
    try {
      const result = await connection.query(
        `SELECT 1 FROM pg_database WHERE datname = $1`,
        [uri.path.base]
      );
      return result.rows.length > 0;
    } finally {
      await connection.close();
    }
  }

  private async checkMongoWorkspace(uri: URI): Promise<boolean> {
    // Check if MongoDB database exists
    const client = await this.dbService.connectMongo(uri);
    try {
      const admin = client.db().admin();
      const databases = await admin.listDatabases();
      return databases.databases.some(db => db.name === uri.path.base);
    } finally {
      await client.close();
    }
  }
}

// Register in backend module
export default new ContainerModule(bind => {
  bind(WorkspaceHandlerContribution).to(DatabaseWorkspaceHandler).inSingletonScope();
});

/**
 * Command contribution interface for workspace extensions
 */
interface CommandContribution {
  /**
   * Register custom commands
   */
  registerCommands(registry: CommandRegistry): void;
}

/**
 * Menu contribution interface for workspace extensions
 */
interface MenuContribution {
  /**
   * Register custom menu items
   */
  registerMenus(registry: MenuModelRegistry): void;
}

/**
 * URI command handler interface for file/folder operations
 */
interface UriCommandHandler<T> {
  /**
   * Execute command with URI(s)
   */
  execute(uri: T, ...args: any[]): any;
  
  /**
   * Check if command is visible for given URI(s)
   */
  isVisible?(uri: T, ...args: any[]): boolean;
  
  /**
   * Check if command is enabled for given URI(s)
   */
  isEnabled?(uri: T, ...args: any[]): boolean;
}

import { injectable, inject } from "@theia/core/shared/inversify";
import { CommandContribution, CommandRegistry, MenuContribution, MenuModelRegistry } from "@theia/core/lib/common";
import { UriCommandHandler } from "@theia/workspace/lib/browser";
import { CommonMenus } from "@theia/core/lib/browser";
import URI from "@theia/core/lib/common/uri";

// Custom command definitions
export namespace MyWorkspaceCommands {
  export const ANALYZE_PROJECT: Command = {
    id: 'my.workspace.analyze',
    label: 'Analyze Project Structure'
  };
  
  export const GENERATE_DOCS: Command = {
    id: 'my.workspace.generateDocs', 
    label: 'Generate Documentation'
  };
  
  export const OPTIMIZE_WORKSPACE: Command = {
    id: 'my.workspace.optimize',
    label: 'Optimize Workspace'
  };
}

@injectable()
export class MyWorkspaceCommandContribution implements CommandContribution {

  @inject(MyProjectAnalyzer)
  protected readonly analyzer: MyProjectAnalyzer;

  @inject(MyDocGenerator)
  protected readonly docGenerator: MyDocGenerator;

  registerCommands(registry: CommandRegistry): void {
    // Register project analysis command
    registry.registerCommand(MyWorkspaceCommands.ANALYZE_PROJECT, {
      execute: () => this.analyzer.analyzeCurrentWorkspace(),
      isEnabled: () => this.workspaceService.opened,
      isVisible: () => true
    });

    // Register documentation generation command
    registry.registerCommand(MyWorkspaceCommands.GENERATE_DOCS, new MyDocGenerationHandler());

    // Register workspace optimization command
    registry.registerCommand(MyWorkspaceCommands.OPTIMIZE_WORKSPACE, {
      execute: async () => {
        const roots = await this.workspaceService.roots;
        await Promise.all(roots.map(root => this.optimizeRoot(root.uri)));
      }
    });
  }

  private async optimizeRoot(uri: URI): Promise<void> {
    console.log(`Optimizing workspace root: ${uri}`);
    // Custom optimization logic
  }
}

@injectable()
export class MyDocGenerationHandler implements UriCommandHandler<URI> {

  @inject(MyDocGenerator)
  protected readonly docGenerator: MyDocGenerator;

  async execute(uri: URI): Promise<void> {
    console.log(`Generating documentation for: ${uri}`);
    await this.docGenerator.generateForPath(uri);
  }

  isVisible(uri: URI): boolean {
    // Only show for directories that contain source code
    return this.docGenerator.hasSourceFiles(uri);
  }

  isEnabled(uri: URI): boolean {
    // Enable if directory is writable
    return this.docGenerator.isWritableDirectory(uri);
  }
}

@injectable()
export class MyWorkspaceMenuContribution implements MenuContribution {

  registerMenus(registry: MenuModelRegistry): void {
    // Add to File menu
    registry.registerMenuAction(CommonMenus.FILE, {
      commandId: MyWorkspaceCommands.ANALYZE_PROJECT.id,
      label: MyWorkspaceCommands.ANALYZE_PROJECT.label,
      order: '6_workspace'
    });

    // Create custom submenu
    const MY_WORKSPACE_MENU = [...CommonMenus.FILE, '7_my_workspace'];
    registry.registerSubmenu(MY_WORKSPACE_MENU, 'My Workspace Tools');

    // Add items to custom submenu
    registry.registerMenuAction(MY_WORKSPACE_MENU, {
      commandId: MyWorkspaceCommands.GENERATE_DOCS.id,
      label: MyWorkspaceCommands.GENERATE_DOCS.label
    });

    registry.registerMenuAction(MY_WORKSPACE_MENU, {
      commandId: MyWorkspaceCommands.OPTIMIZE_WORKSPACE.id,
      label: MyWorkspaceCommands.OPTIMIZE_WORKSPACE.label
    });

    // Add to context menu for explorer
    registry.registerMenuAction(['explorer-context-menu'], {
      commandId: MyWorkspaceCommands.GENERATE_DOCS.id,
      label: 'Generate Docs',
      when: 'explorerResourceIsFolder'
    });
  }
}

// Register both contributions
export default new ContainerModule(bind => {
  bind(CommandContribution).to(MyWorkspaceCommandContribution).inSingletonScope();
  bind(MenuContribution).to(MyWorkspaceMenuContribution).inSingletonScope();
});

/**
 * Preference contribution interface
 */
interface PreferenceContribution {
  /**
   * Preference schema definition
   */
  readonly schema: PreferenceSchema;
}

/**
 * Preference schema structure
 */
interface PreferenceSchema {
  type: string;
  scope?: PreferenceScope;
  properties: { [key: string]: PreferenceSchemaProperty };
}

import { injectable } from "@theia/core/shared/inversify";
import { PreferenceContribution, PreferenceSchema, PreferenceScope } from "@theia/core/lib/browser";

// Define custom preference schema
export const myWorkspacePreferenceSchema: PreferenceSchema = {
  type: 'object',
  scope: PreferenceScope.Workspace, // Workspace-level preferences
  properties: {
    'myExtension.autoAnalyze': {
      description: 'Automatically analyze project structure on workspace open',
      type: 'boolean',
      default: true
    },
    'myExtension.docFormat': {
      description: 'Default documentation format',
      type: 'string',
      enum: ['markdown', 'html', 'pdf'],
      default: 'markdown'
    },
    'myExtension.optimizationLevel': {
      description: 'Workspace optimization level',
      type: 'string',
      enum: ['minimal', 'standard', 'aggressive'],
      default: 'standard'
    },
    'myExtension.excludePatterns': {
      description: 'File patterns to exclude from analysis',
      type: 'array',
      items: { type: 'string' },
      default: ['node_modules/**', '.git/**', 'dist/**']
    }
  }
};

@injectable()
export class MyWorkspacePreferenceContribution implements PreferenceContribution {
  readonly schema = myWorkspacePreferenceSchema;
}

// Usage of the preferences
interface MyWorkspaceConfiguration {
  'myExtension.autoAnalyze': boolean;
  'myExtension.docFormat': 'markdown' | 'html' | 'pdf';
  'myExtension.optimizationLevel': 'minimal' | 'standard' | 'aggressive';
  'myExtension.excludePatterns': string[];
}

type MyWorkspacePreferences = PreferenceProxy<MyWorkspaceConfiguration>;

@injectable() 
export class MyWorkspaceConfigManager {

  @inject(MyWorkspacePreferences)
  protected readonly preferences: MyWorkspacePreferences;

  shouldAutoAnalyze(): boolean {
    return this.preferences['myExtension.autoAnalyze'];
  }

  getDocumentationFormat(): string {
    return this.preferences['myExtension.docFormat'];
  }

  getExcludePatterns(): string[] {
    return this.preferences['myExtension.excludePatterns'];
  }

  listenToPreferenceChanges(): void {
    this.preferences.onPreferenceChanged(event => {
      console.log(`Preference ${event.preferenceName} changed from ${event.oldValue} to ${event.newValue}`);
      
      if (event.preferenceName === 'myExtension.autoAnalyze') {
        this.handleAutoAnalyzeChange(event.newValue);
      }
    });
  }

  private handleAutoAnalyzeChange(enabled: boolean): void {
    if (enabled) {
      console.log("Auto-analysis enabled");
      this.startAutoAnalysis();
    } else {
      console.log("Auto-analysis disabled");
      this.stopAutoAnalysis();
    }
  }
}

// Register preference contribution
export default new ContainerModule(bind => {
  bind(PreferenceContribution).to(MyWorkspacePreferenceContribution).inSingletonScope();
  bind(MyWorkspacePreferences).toDynamicValue(ctx => {
    const preferences = ctx.container.get(PreferenceService);
    return createPreferenceProxy(preferences, myWorkspacePreferenceSchema);
  }).inSingletonScope();
});

import { injectable, inject, postConstruct } from "@theia/core/shared/inversify";
import { WorkspaceService, DidCreateNewResourceEvent } from "@theia/workspace/lib/browser";
import { Disposable, DisposableCollection } from "@theia/core";

@injectable()
export class MyWorkspaceEventListener {

  @inject(WorkspaceService)
  protected readonly workspaceService: WorkspaceService;

  protected readonly disposables = new DisposableCollection();

  @postConstruct()
  initialize(): void {
    this.listenToWorkspaceEvents();
  }

  dispose(): void {
    this.disposables.dispose();
  }

  private listenToWorkspaceEvents(): void {
    // Listen to workspace changes
    this.disposables.push(
      this.workspaceService.onWorkspaceChanged(roots => {
        console.log(`Workspace roots changed. New count: ${roots.length}`);
        this.handleWorkspaceChange(roots);
      })
    );

    // Listen to workspace location changes
    this.disposables.push(
      this.workspaceService.onWorkspaceLocationChanged(workspace => {
        if (workspace) {
          console.log(`Workspace location changed to: ${workspace.uri}`);
          this.handleWorkspaceLocationChange(workspace);
        } else {
          console.log("Workspace was closed");
          this.handleWorkspaceClosed();
        }
      })
    );

    // Listen to new file/folder creation
    this.disposables.push(
      this.workspaceCommands.onDidCreateNewFile(event => {
        console.log(`New file created: ${event.uri}`);
        this.handleNewFileCreated(event);
      })
    );

    this.disposables.push(
      this.workspaceCommands.onDidCreateNewFolder(event => {
        console.log(`New folder created: ${event.uri}`);
        this.handleNewFolderCreated(event);
      })
    );
  }

  private handleWorkspaceChange(roots: FileStat[]): void {
    // React to workspace root changes
    roots.forEach((root, index) => {
      console.log(`Processing root ${index}: ${root.uri}`);
      this.analyzeWorkspaceRoot(root);
    });
  }

  private handleWorkspaceLocationChange(workspace: FileStat): void {
    // React to workspace file location changes
    this.updateWorkspaceConfiguration(workspace);
  }

  private handleWorkspaceClosed(): void {
    // Clean up when workspace is closed
    this.cleanupWorkspaceData();
  }

  private handleNewFileCreated(event: DidCreateNewResourceEvent): void {
    // Automatically configure new files
    this.configureNewFile(event.uri, event.parent);
  }

  private handleNewFolderCreated(event: DidCreateNewResourceEvent): void {
    // Set up new folder structure
    this.initializeFolderStructure(event.uri);
  }
}

interface WorkspaceOpenHandlerContribution {
  canHandle(uri: URI): MaybePromise<boolean>;
  openWorkspace(uri: URI, options?: WorkspaceInput): MaybePromise<void>;
  getWorkspaceLabel?(uri: URI): MaybePromise<string | undefined>;
}

interface WorkspaceHandlerContribution {
  canHandle(uri: URI): boolean;
  workspaceStillExists(uri: URI): Promise<boolean>;
}

interface CommandContribution {
  registerCommands(registry: CommandRegistry): void;
}

interface MenuContribution {
  registerMenus(registry: MenuModelRegistry): void;
}

interface UriCommandHandler<T> {
  execute(uri: T, ...args: any[]): any;
  isVisible?(uri: T, ...args: any[]): boolean;
  isEnabled?(uri: T, ...args: any[]): boolean;
}

interface PreferenceContribution {
  readonly schema: PreferenceSchema;
}

interface WorkspaceInput {
  preserveWindow?: boolean;
}

type MaybePromise<T> = T | Promise<T>;

// Contribution provider symbols
const WorkspaceOpenHandlerContribution: symbol;
const WorkspaceHandlerContribution: symbol;