import * as interfaces from './smartagent.interfaces.js';
import { BaseToolWrapper } from './smartagent.tools.base.js';

/**
 * ToolRegistry - Manages tool registration, visibility, and lifecycle
 *
 * Responsibilities:
 * - Track all registered tools with their metadata
 * - Manage visibility (initial vs on-demand)
 * - Handle activation of on-demand tools
 * - Provide search functionality
 */
export class ToolRegistry {
  private tools: Map<string, BaseToolWrapper> = new Map();
  private metadata: Map<string, interfaces.IToolMetadata> = new Map();
  private activated: Set<string> = new Set();

  /**
   * Register a tool with optional visibility settings
   */
  register(tool: BaseToolWrapper, options: interfaces.IToolRegistrationOptions = {}): void {
    const visibility = options.visibility ?? 'initial';

    this.tools.set(tool.name, tool);
    this.metadata.set(tool.name, {
      name: tool.name,
      description: tool.description,
      actions: tool.actions,
      visibility,
      isActivated: visibility === 'initial',
      isInitialized: false,
      tags: options.tags,
      category: options.category,
    });

    if (visibility === 'initial') {
      this.activated.add(tool.name);
    }
  }

  /**
   * Get tools visible to the Driver (initial + activated on-demand)
   */
  getVisibleTools(): BaseToolWrapper[] {
    return Array.from(this.tools.entries())
      .filter(([name]) => this.activated.has(name))
      .map(([, tool]) => tool);
  }

  /**
   * Get all tools (for search results)
   */
  getAllTools(): BaseToolWrapper[] {
    return Array.from(this.tools.values());
  }

  /**
   * Get a specific tool by name
   */
  getTool(name: string): BaseToolWrapper | undefined {
    return this.tools.get(name);
  }

  /**
   * Get metadata for a tool
   */
  getMetadata(name: string): interfaces.IToolMetadata | undefined {
    return this.metadata.get(name);
  }

  /**
   * Get all metadata
   */
  getAllMetadata(): interfaces.IToolMetadata[] {
    return Array.from(this.metadata.values());
  }

  /**
   * Search tools by query (matches name, description, tags, action names)
   */
  search(query: string): interfaces.IToolMetadata[] {
    const q = query.toLowerCase();
    return this.getAllMetadata().filter((meta) => {
      if (meta.name.toLowerCase().includes(q)) return true;
      if (meta.description.toLowerCase().includes(q)) return true;
      if (meta.tags?.some((t) => t.toLowerCase().includes(q))) return true;
      if (meta.category?.toLowerCase().includes(q)) return true;
      if (
        meta.actions.some(
          (a) => a.name.toLowerCase().includes(q) || a.description.toLowerCase().includes(q)
        )
      )
        return true;
      return false;
    });
  }

  /**
   * Activate an on-demand tool
   */
  async activate(name: string): Promise<{ success: boolean; error?: string }> {
    const tool = this.tools.get(name);
    const meta = this.metadata.get(name);

    if (!tool || !meta) {
      return { success: false, error: `Tool "${name}" not found` };
    }

    if (this.activated.has(name)) {
      return { success: true }; // Already activated
    }

    // Initialize if not already initialized
    if (!meta.isInitialized) {
      await tool.initialize();
      meta.isInitialized = true;
    }

    this.activated.add(name);
    meta.isActivated = true;

    return { success: true };
  }

  /**
   * Check if a tool is activated
   */
  isActivated(name: string): boolean {
    return this.activated.has(name);
  }

  /**
   * Initialize all initial (visible) tools
   */
  async initializeVisibleTools(): Promise<void> {
    const promises: Promise<void>[] = [];

    for (const [name, tool] of this.tools) {
      const meta = this.metadata.get(name);
      if (meta && this.activated.has(name) && !meta.isInitialized) {
        promises.push(
          tool.initialize().then(() => {
            meta.isInitialized = true;
          })
        );
      }
    }

    await Promise.all(promises);
  }

  /**
   * Cleanup all initialized tools
   */
  async cleanup(): Promise<void> {
    const promises: Promise<void>[] = [];

    for (const [name, tool] of this.tools) {
      const meta = this.metadata.get(name);
      if (meta?.isInitialized) {
        promises.push(tool.cleanup());
      }
    }

    await Promise.all(promises);
  }

  /**
   * Check if a tool exists in the registry
   */
  has(name: string): boolean {
    return this.tools.has(name);
  }

  /**
   * Get the number of registered tools
   */
  get size(): number {
    return this.tools.size;
  }

  /**
   * Get the number of activated tools
   */
  get activatedCount(): number {
    return this.activated.size;
  }
}