/**
 * Unified Delegation API
 * 
 * Single entry point for all delegation operations.
 * Provides easy integration for 3rd party AI coding tools.
 */

import {
  DelegationAPIConfig,
  DelegationRequest,
  DelegationResponse,
  IntegrationType,
  AgentType,
  RequestClassification,
  DelegationDecision,
  ProgressEvent,
  DelegationResult
} from './core/types';

import { RequestClassifier, createRequestClassifier } from './core/request-classifier';
import { DelegationEngine, createDelegationEngine } from './core/delegation-engine';
import { AgentPoolManager, createAgentPoolManager } from './pool/agent-pool-manager';
import { ProgressStreamer, createProgressStreamer } from './streaming/progress-streamer';
import { QualityGate, createQualityGate } from './quality/quality-gate';
import { ContextHandoffManager, createContextHandoffManager } from './core/context-handoff';

import {
  OpenClawAdapter,
  ClaudeCodeAdapter,
  GenericAdapter,
  BaseIntegrationAdapter,
  createOpenClawAdapter,
  createClaudeCodeAdapter,
  createGenericAdapter
} from './integrations/adapters';

// ============================================================================
// Default Configuration
// ============================================================================

const DEFAULT_API_CONFIG: DelegationAPIConfig = {
  integrations: [],
  defaultStrategy: 'hybrid',
  maxConcurrentDelegations: 100,
  requestTimeout: 120000,
  enableCaching: true,
  cacheConfig: {
    maxSize: 1000,
    ttl: 300000
  }
};

// ============================================================================
// Delegation System Class
// ============================================================================

export class DelegationSystem {
  private config: DelegationAPIConfig;
  private classifier: RequestClassifier;
  private poolManager: AgentPoolManager;
  private delegationEngine: DelegationEngine;
  private progressStreamer: ProgressStreamer;
  private qualityGate: QualityGate;
  private handoffManager: ContextHandoffManager;
  private adapters: Map<IntegrationType, BaseIntegrationAdapter> = new Map();
  private initialized: boolean = false;

  constructor(config: Partial<DelegationAPIConfig> = {}) {
    this.config = { ...DEFAULT_API_CONFIG, ...config };

    // Initialize core components
    this.classifier = createRequestClassifier();
    this.poolManager = createAgentPoolManager();
    this.progressStreamer = createProgressStreamer();
    this.qualityGate = createQualityGate();
    this.delegationEngine = createDelegationEngine(
      this.classifier,
      this.poolManager
    );
    this.handoffManager = createContextHandoffManager();
  }

  // ============================================================================
  // Initialization
  // ============================================================================

  /**
   * Initialize the delegation system
   */
  async initialize(): Promise<void> {
    if (this.initialized) return;

    // Initialize configured integrations
    for (const integrationConfig of this.config.integrations) {
      await this.registerIntegration(integrationConfig.type, integrationConfig);
    }

    // If no integrations configured, register default ones
    if (this.adapters.size === 0) {
      await this.registerIntegration('openclaw');
      await this.registerIntegration('claude-code');
      await this.registerIntegration('generic');
    }

    this.initialized = true;
  }

  /**
   * Register an integration
   */
  async registerIntegration(
    type: IntegrationType,
    config?: any
  ): Promise<BaseIntegrationAdapter> {
    let adapter: BaseIntegrationAdapter;

    switch (type) {
      case 'openclaw':
        adapter = createOpenClawAdapter(
          this.classifier,
          this.delegationEngine,
          this.poolManager,
          this.progressStreamer,
          this.qualityGate
        );
        break;

      case 'claude-code':
        adapter = createClaudeCodeAdapter(
          this.classifier,
          this.delegationEngine,
          this.poolManager,
          this.progressStreamer,
          this.qualityGate
        );
        break;

      case 'cursor':
      case 'aider':
      case 'copilot':
      case 'generic':
      default:
        adapter = createGenericAdapter(
          this.classifier,
          this.delegationEngine,
          this.poolManager,
          this.progressStreamer,
          this.qualityGate
        );
        break;
    }

    await adapter.initialize(config || {});
    this.adapters.set(type, adapter);

    return adapter;
  }

  // ============================================================================
  // Main API Methods
  // ============================================================================

  /**
   * Process a delegation request
   */
  async process(request: DelegationRequest): Promise<DelegationResponse> {
    if (!this.initialized) {
      await this.initialize();
    }

    const startTime = Date.now();
    const requestId = request.id || `req-${Date.now()}`;

    // Determine which integration to use
    const integrationType = request.metadata?.integration || 'generic';
    const adapter = this.adapters.get(integrationType as IntegrationType) || 
                    this.adapters.get('generic')!;

    try {
      // Classify request
      const classification = await adapter.classifyRequest({
        content: request.content,
        type: request.type,
        files: request.files,
        metadata: request.metadata
      });

      // Make delegation decision
      const decision = await this.delegationEngine.makeDecision({
        content: request.content,
        type: request.type,
        files: request.files,
        metadata: request.metadata,
        timestamp: Date.now()
      }, classification);

      // Start progress tracking if requested
      if (request.streamProgress) {
        this.progressStreamer.startTracking(requestId);
      }

      // Execute delegation or process directly
      let result: DelegationResult;

      if (decision.shouldDelegate) {
        result = await adapter.delegateRequest({
          content: request.content,
          files: request.files,
          metadata: request.metadata
        }, decision);
      } else {
        // Process with main agent (simulated)
        result = {
          success: true,
          output: `Main agent processed: ${request.content.slice(0, 100)}`,
          confidence: 0.95,
          tokensUsed: 200,
          duration: Date.now() - startTime,
          agentsUsed: ['main-agent'],
          needsReview: false
        };
      }

      // Build response
      const response: DelegationResponse = {
        requestId,
        success: result.success,
        result: result.output,
        classification,
        delegation: decision,
        confidence: result.confidence,
        processingTime: Date.now() - startTime,
        agentsUsed: result.agentsUsed
      };

      // Complete progress tracking
      if (request.streamProgress) {
        this.progressStreamer.complete(requestId);
      }

      return response;

    } catch (error) {
      // Error handling
      if (request.streamProgress) {
        this.progressStreamer.error(requestId, error instanceof Error ? error.message : 'Unknown error');
      }

      return {
        requestId,
        success: false,
        result: `Error: ${error instanceof Error ? error.message : 'Unknown error'}`,
        confidence: 0,
        processingTime: Date.now() - startTime,
        agentsUsed: []
      };
    }
  }

  /**
   * Quick classify a request (fast path)
   */
  quickClassify(content: string): { complexity: string; agent: AgentType } {
    return this.classifier.quickClassify(content);
  }

  /**
   * Get an integration adapter
   */
  getAdapter(type: IntegrationType): BaseIntegrationAdapter | undefined {
    return this.adapters.get(type);
  }

  /**
   * Get all registered adapters
   */
  getAdapters(): Map<IntegrationType, BaseIntegrationAdapter> {
    return new Map(this.adapters);
  }

  // ============================================================================
  // Progress Streaming
  // ============================================================================

  /**
   * Subscribe to progress updates
   */
  onProgress(
    requestId: string,
    callback: (event: ProgressEvent) => void
  ): () => void {
    return this.progressStreamer.subscribe(requestId, callback);
  }

  /**
   * Subscribe to all progress events
   */
  onAllProgress(callback: (event: ProgressEvent) => void): () => void {
    return this.progressStreamer.subscribeAll(callback);
  }

  // ============================================================================
  // Status and Statistics
  // ============================================================================

  /**
   * Get system status
   */
  getStatus(): {
    initialized: boolean;
    adapters: number;
    poolStats: ReturnType<AgentPoolManager['getPoolStats']>;
    delegationStats: ReturnType<DelegationEngine['getStats']>;
    qualityStats: ReturnType<QualityGate['getStats']>;
  } {
    return {
      initialized: this.initialized,
      adapters: this.adapters.size,
      poolStats: this.poolManager.getPoolStats(),
      delegationStats: this.delegationEngine.getStats(),
      qualityStats: this.qualityGate.getStats()
    };
  }

  /**
   * Get pool statistics
   */
  getPoolStats(): ReturnType<AgentPoolManager['getPoolStats']> {
    return this.poolManager.getPoolStats();
  }

  /**
   * Check if system is ready
   */
  isReady(): boolean {
    return this.initialized && this.poolManager.getPoolStats().idleCount > 0;
  }

  // ============================================================================
  // Lifecycle
  // ============================================================================

  /**
   * Shutdown the system
   */
  async shutdown(): Promise<void> {
    // Shutdown all adapters
    for (const adapter of this.adapters.values()) {
      await adapter.shutdown();
    }

    // Shutdown pool
    await this.poolManager.shutdown();

    // Clear progress
    this.progressStreamer.clearAll();

    this.initialized = false;
  }

  /**
   * Reset the system
   */
  async reset(): Promise<void> {
    await this.shutdown();
    await this.initialize();
  }
}

// ============================================================================
// Factory Function
// ============================================================================

let defaultInstance: DelegationSystem | null = null;

export function createDelegationSystem(
  config?: Partial<DelegationAPIConfig>
): DelegationSystem {
  return new DelegationSystem(config);
}

export function getDefaultDelegationSystem(): DelegationSystem {
  if (!defaultInstance) {
    defaultInstance = new DelegationSystem();
  }
  return defaultInstance;
}

// ============================================================================
// Convenience Exports
// ============================================================================

// Re-export all types
export * from './core/types';

// Re-export all components
export { RequestClassifier, createRequestClassifier } from './core/request-classifier';
export { DelegationEngine, createDelegationEngine } from './core/delegation-engine';
export { AgentPoolManager, createAgentPoolManager } from './pool/agent-pool-manager';
export { ProgressStreamer, createProgressStreamer } from './streaming/progress-streamer';
export { QualityGate, createQualityGate } from './quality/quality-gate';
export { ContextHandoffManager, createContextHandoffManager } from './core/context-handoff';
export {
  OpenClawAdapter,
  ClaudeCodeAdapter,
  GenericAdapter,
  createOpenClawAdapter,
  createClaudeCodeAdapter,
  createGenericAdapter
} from './integrations/adapters';

// ============================================================================
// Export
// ============================================================================

export default DelegationSystem;