import * as plugins from '../../plugins.js';
import type { OpsServer } from '../classes.opsserver.js';
import * as interfaces from '../../../ts_interfaces/index.js';
import { SecurityLogger } from '../../security/index.js';

export class EmailOpsHandler {
  public typedrouter = new plugins.typedrequest.TypedRouter();

  constructor(private opsServerRef: OpsServer) {
    // Add this handler's router to the parent
    this.opsServerRef.typedrouter.addTypedRouter(this.typedrouter);
    this.registerHandlers();
  }

  private registerHandlers(): void {
    // Get Queued Emails Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetQueuedEmails>(
        'getQueuedEmails',
        async (dataArg) => {
          const emailServer = this.opsServerRef.dcRouterRef.emailServer;
          if (!emailServer?.deliveryQueue) {
            return { items: [], total: 0 };
          }

          const queue = emailServer.deliveryQueue;
          const stats = queue.getStats();

          // Get all queue items and filter by status if provided
          const items = this.getQueueItems(
            dataArg.status,
            dataArg.limit || 50,
            dataArg.offset || 0
          );

          return {
            items,
            total: stats.queueSize,
          };
        }
      )
    );

    // Get Sent Emails Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetSentEmails>(
        'getSentEmails',
        async (dataArg) => {
          const items = this.getQueueItems(
            'delivered',
            dataArg.limit || 50,
            dataArg.offset || 0
          );

          return {
            items,
            total: items.length, // Note: total would ideally come from a counter
          };
        }
      )
    );

    // Get Failed Emails Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetFailedEmails>(
        'getFailedEmails',
        async (dataArg) => {
          const items = this.getQueueItems(
            'failed',
            dataArg.limit || 50,
            dataArg.offset || 0
          );

          return {
            items,
            total: items.length,
          };
        }
      )
    );

    // Resend Failed Email Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_ResendEmail>(
        'resendEmail',
        async (dataArg) => {
          const emailServer = this.opsServerRef.dcRouterRef.emailServer;
          if (!emailServer?.deliveryQueue) {
            return { success: false, error: 'Email server not available' };
          }

          const queue = emailServer.deliveryQueue;
          const item = queue.getItem(dataArg.emailId);

          if (!item) {
            return { success: false, error: 'Email not found in queue' };
          }

          if (item.status !== 'failed') {
            return { success: false, error: `Email is not in failed state (current: ${item.status})` };
          }

          try {
            // Re-enqueue the failed email by creating a new queue entry
            // with the same data but reset attempt count
            const newQueueId = await queue.enqueue(
              item.processingResult,
              item.processingMode,
              item.route
            );

            // Optionally remove the old failed entry
            await queue.removeItem(dataArg.emailId);

            return { success: true, newQueueId };
          } catch (error) {
            return {
              success: false,
              error: error instanceof Error ? error.message : 'Failed to resend email'
            };
          }
        }
      )
    );

    // Get Security Incidents Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetSecurityIncidents>(
        'getSecurityIncidents',
        async (dataArg) => {
          const securityLogger = SecurityLogger.getInstance();

          const filter: {
            level?: any;
            type?: any;
          } = {};

          if (dataArg.level) {
            filter.level = dataArg.level;
          }

          if (dataArg.type) {
            filter.type = dataArg.type;
          }

          const incidents = securityLogger.getRecentEvents(
            dataArg.limit || 100,
            Object.keys(filter).length > 0 ? filter : undefined
          );

          return {
            incidents: incidents.map(event => ({
              timestamp: event.timestamp,
              level: event.level as interfaces.requests.TSecurityLogLevel,
              type: event.type as interfaces.requests.TSecurityEventType,
              message: event.message,
              details: event.details,
              ipAddress: event.ipAddress,
              userId: event.userId,
              sessionId: event.sessionId,
              emailId: event.emailId,
              domain: event.domain,
              action: event.action,
              result: event.result,
              success: event.success,
            })),
            total: incidents.length,
          };
        }
      )
    );

    // Get Bounce Records Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetBounceRecords>(
        'getBounceRecords',
        async (dataArg) => {
          const emailServer = this.opsServerRef.dcRouterRef.emailServer;

          // Get bounce manager from email server via reflection
          // BounceManager is private but we need to access it
          const bounceManager = (emailServer as any)?.bounceManager;

          if (!bounceManager) {
            return { records: [], suppressionList: [], total: 0 };
          }

          // Get suppression list
          const suppressionList = bounceManager.getSuppressionList();

          // Get hard bounced addresses and convert to records
          const hardBouncedAddresses = bounceManager.getHardBouncedAddresses();

          // Create bounce records from the available data
          const records: interfaces.requests.IBounceRecord[] = [];

          for (const email of hardBouncedAddresses) {
            const bounceInfo = bounceManager.getBounceInfo(email);
            if (bounceInfo) {
              records.push({
                id: `bounce-${email}`,
                recipient: email,
                sender: '',
                domain: email.split('@')[1] || '',
                bounceType: bounceInfo.type as interfaces.requests.TBounceType,
                bounceCategory: bounceInfo.category as interfaces.requests.TBounceCategory,
                timestamp: bounceInfo.lastBounce,
                processed: true,
              });
            }
          }

          // Apply limit and offset
          const limit = dataArg.limit || 50;
          const offset = dataArg.offset || 0;
          const paginatedRecords = records.slice(offset, offset + limit);

          return {
            records: paginatedRecords,
            suppressionList,
            total: records.length,
          };
        }
      )
    );

    // Remove from Suppression List Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_RemoveFromSuppressionList>(
        'removeFromSuppressionList',
        async (dataArg) => {
          const emailServer = this.opsServerRef.dcRouterRef.emailServer;
          const bounceManager = (emailServer as any)?.bounceManager;

          if (!bounceManager) {
            return { success: false, error: 'Bounce manager not available' };
          }

          try {
            bounceManager.removeFromSuppressionList(dataArg.email);
            return { success: true };
          } catch (error) {
            return {
              success: false,
              error: error instanceof Error ? error.message : 'Failed to remove from suppression list'
            };
          }
        }
      )
    );
  }

  /**
   * Helper method to get queue items with filtering and pagination
   */
  private getQueueItems(
    status?: interfaces.requests.TEmailQueueStatus,
    limit: number = 50,
    offset: number = 0
  ): interfaces.requests.IEmailQueueItem[] {
    const emailServer = this.opsServerRef.dcRouterRef.emailServer;
    if (!emailServer?.deliveryQueue) {
      return [];
    }

    const queue = emailServer.deliveryQueue;
    const items: interfaces.requests.IEmailQueueItem[] = [];

    // Access the internal queue map via reflection
    // This is necessary because the queue doesn't expose iteration methods
    const queueMap = (queue as any).queue as Map<string, any>;

    if (!queueMap) {
      return [];
    }

    // Filter and convert items
    for (const [id, item] of queueMap.entries()) {
      // Apply status filter if provided
      if (status && item.status !== status) {
        continue;
      }

      // Extract email details from processingResult if available
      const processingResult = item.processingResult;
      let from = '';
      let to: string[] = [];
      let subject = '';

      if (processingResult) {
        // Check if it's an Email object or raw email data
        if (processingResult.email) {
          from = processingResult.email.from || '';
          to = processingResult.email.to || [];
          subject = processingResult.email.subject || '';
        } else if (processingResult.from) {
          from = processingResult.from;
          to = processingResult.to || [];
          subject = processingResult.subject || '';
        }
      }

      items.push({
        id: item.id,
        processingMode: item.processingMode,
        status: item.status,
        attempts: item.attempts,
        nextAttempt: item.nextAttempt instanceof Date ? item.nextAttempt.getTime() : item.nextAttempt,
        lastError: item.lastError,
        createdAt: item.createdAt instanceof Date ? item.createdAt.getTime() : item.createdAt,
        updatedAt: item.updatedAt instanceof Date ? item.updatedAt.getTime() : item.updatedAt,
        deliveredAt: item.deliveredAt instanceof Date ? item.deliveredAt.getTime() : item.deliveredAt,
        from,
        to,
        subject,
      });
    }

    // Sort by createdAt descending (newest first)
    items.sort((a, b) => b.createdAt - a.createdAt);

    // Apply pagination
    return items.slice(offset, offset + limit);
  }
}