import { prisma } from '@/lib/prisma';
import { LeantimeService } from './leantime-service';
import { OutlineService } from './outline-service';
import { RocketChatService } from './rocketchat-service';
import axios from 'axios';

interface IntegrationResult {
  success: boolean;
  error?: string;
  data?: {
    leantimeProjectId?: number;
    outlineCollectionId?: string;
    rocketChatChannelId?: string;
    giteaRepositoryUrl?: string;
    penpotProjectId?: string;
  };
}

export class IntegrationService {
  private leantimeService: LeantimeService;
  private outlineService: OutlineService;
  private rocketChatService: RocketChatService;

  constructor() {
    this.leantimeService = new LeantimeService();
    this.outlineService = new OutlineService();
    this.rocketChatService = new RocketChatService();
  }

  /**
   * Set up all integrations for a mission
   * @param missionId The mission ID
   * @returns Integration result
   */
  async setupIntegrationsForMission(missionId: string): Promise<IntegrationResult> {
    try {
      // Get complete mission data with users
      const mission = await prisma.mission.findUnique({
        where: { id: missionId },
        include: {
          missionUsers: {
            include: {
              user: true
            }
          },
          attachments: true
        }
      });

      if (!mission) {
        throw new Error(`Mission not found: ${missionId}`);
      }

      // These fields will store the IDs of created resources
      let leantimeProjectId: number | undefined;
      let outlineCollectionId: string | undefined;
      let rocketChatChannelId: string | undefined;
      
      // Track which integrations succeeded and which failed
      const integrationStatus = {
        leantime: { success: false, id: undefined as number | undefined, error: undefined as string | undefined },
        outline: { success: false, id: undefined as string | undefined, error: undefined as string | undefined },
        rocketchat: { success: false, id: undefined as string | undefined, error: undefined as string | undefined }
      };
      
      // A flag to determine if we should consider this a success or failure overall
      let criticalFailure = false;

      try {
        // Step 1: Create Leantime project (Consider this a critical integration)
        try {
          console.log('Starting Leantime project creation...');
          leantimeProjectId = await this.leantimeService.createProject(mission);
          console.log(`Leantime project created with ID: ${leantimeProjectId}`);
          integrationStatus.leantime.success = true;
          integrationStatus.leantime.id = leantimeProjectId;
        } catch (leantimeError) {
          console.error('Error creating Leantime project:', leantimeError);
          integrationStatus.leantime.success = false;
          integrationStatus.leantime.error = leantimeError instanceof Error ? leantimeError.message : String(leantimeError);
          criticalFailure = true;
          throw leantimeError; // Leantime is critical, so we rethrow
        }
        
        // Add a delay to avoid rate limits (extended to 3 seconds)
        console.log('Waiting 3 seconds before proceeding to Outline integration...');
        await new Promise(resolve => setTimeout(resolve, 3000));
        
        // Step 2: Create Outline collection (Consider this non-critical)
        try {
          console.log('Starting Outline collection creation...');
          outlineCollectionId = await this.outlineService.createCollection(mission);
          console.log(`Outline collection created with ID: ${outlineCollectionId}`);
          integrationStatus.outline.success = true;
          integrationStatus.outline.id = outlineCollectionId;
        } catch (outlineError) {
          console.error('Error creating Outline collection:', outlineError);
          integrationStatus.outline.success = false;
          integrationStatus.outline.error = outlineError instanceof Error ? outlineError.message : String(outlineError);
          
          // Check if it's an authentication error (401)
          if (axios.isAxiosError(outlineError) && outlineError.response?.status === 401) {
            console.log('⚠️ Outline authentication error. Please check your API credentials.');
          } else if (axios.isAxiosError(outlineError) && outlineError.response?.status === 429) {
            console.log('⚠️ Outline rate limiting error (429). The integration will be skipped for now.');
          }
          
          // Don't set criticalFailure - Outline is non-critical
        }
        
        // Add a delay to avoid rate limits (extended to 3 seconds)
        console.log('Waiting 3 seconds before proceeding to Rocket.Chat integration...');
        await new Promise(resolve => setTimeout(resolve, 3000));
        
        // Step 3: Create Rocket.Chat channel (Consider this non-critical)
        try {
          console.log('Starting Rocket.Chat channel creation...');
          rocketChatChannelId = await this.rocketChatService.createChannel(mission);
          console.log(`Rocket.Chat channel created with ID: ${rocketChatChannelId}`);
          integrationStatus.rocketchat.success = true;
          integrationStatus.rocketchat.id = rocketChatChannelId;
        } catch (rocketChatError) {
          console.error('Error creating Rocket.Chat channel:', rocketChatError);
          integrationStatus.rocketchat.success = false;
          integrationStatus.rocketchat.error = rocketChatError instanceof Error ? rocketChatError.message : String(rocketChatError);
          
          // Check for rate limiting
          if (axios.isAxiosError(rocketChatError) && rocketChatError.response?.status === 429) {
            console.log('⚠️ Rocket.Chat rate limiting error (429). The integration will be skipped for now.');
          }
          // Don't set criticalFailure - Rocket.Chat is non-critical
        }
        
        // Update the mission with the integration IDs (only for successful integrations)
        await prisma.mission.update({
          where: { id: missionId },
          data: {
            leantimeProjectId: integrationStatus.leantime.success ? leantimeProjectId?.toString() : undefined,
            outlineCollectionId: integrationStatus.outline.success ? outlineCollectionId : undefined,
            rocketChatChannelId: integrationStatus.rocketchat.success ? rocketChatChannelId : undefined
            // giteaRepositoryUrl and penpotProjectId will be added when implemented
          }
        });

        // Output a summary of integration results
        console.log('Integration results:', JSON.stringify(integrationStatus, null, 2));
        
        // If we get here without a critical failure, we consider it a success
        // even if some non-critical integrations failed
        return {
          success: !criticalFailure,
          data: {
            leantimeProjectId,
            outlineCollectionId,
            rocketChatChannelId
          }
        };
      } catch (error) {
        console.error('Error setting up integrations:', error);
        
        // Rollback any created resources
        await this.rollbackIntegrations(leantimeProjectId, outlineCollectionId, rocketChatChannelId);
        
        // Delete the mission itself since a critical integration failed
        try {
          await prisma.mission.delete({
            where: { id: missionId }
          });
          console.log(`Mission ${missionId} deleted due to critical integration failure.`);
        } catch (deleteError) {
          console.error('Error deleting mission after integration failure:', deleteError);
        }
        
        return {
          success: false,
          error: `Integration failed: ${error instanceof Error ? error.message : String(error)}`
        };
      }
    } catch (error) {
      console.error('Error in integration setup:', error);
      return {
        success: false,
        error: `Integration setup failed: ${error instanceof Error ? error.message : String(error)}`
      };
    }
  }

  /**
   * Rollback integrations if any step fails
   * @param leantimeProjectId The Leantime project ID to delete
   * @param outlineCollectionId The Outline collection ID to delete
   * @param rocketChatChannelId The Rocket.Chat channel ID to delete
   */
  private async rollbackIntegrations(
    leantimeProjectId?: number,
    outlineCollectionId?: string,
    rocketChatChannelId?: string
  ): Promise<void> {
    console.log('⚠️ Rolling back integrations due to an error...');
    
    // Track what we've successfully rolled back
    const rollbackStatuses = {
      leantime: false,
      outline: false,
      rocketchat: false
    };
    
    try {
      // Attempt to delete Leantime project
      if (leantimeProjectId) {
        try {
          console.log(`Attempting to delete Leantime project: ${leantimeProjectId}`);
          const leantimeSuccess = await this.leantimeService.deleteProject(leantimeProjectId);
          rollbackStatuses.leantime = leantimeSuccess;
          console.log(`Leantime project deletion ${leantimeSuccess ? 'successful' : 'failed'}: ${leantimeProjectId}`);
          
          // Add a longer delay to avoid rate limiting (3 seconds)
          console.log('Waiting 3 seconds before next rollback operation...');
          await new Promise(resolve => setTimeout(resolve, 3000));
        } catch (leantimeError) {
          console.error('Error during Leantime rollback:', leantimeError);
          console.log(`⚠️ Note: Leantime project ${leantimeProjectId} may need to be deleted manually`);
        }
      }
      
      // Attempt to delete Outline collection
      if (outlineCollectionId) {
        try {
          console.log(`Attempting to delete Outline collection: ${outlineCollectionId}`);
          const outlineSuccess = await this.outlineService.deleteCollection(outlineCollectionId);
          rollbackStatuses.outline = outlineSuccess;
          console.log(`Outline collection deletion ${outlineSuccess ? 'successful' : 'failed'}: ${outlineCollectionId}`);
          
          // Add a longer delay to avoid rate limiting (3 seconds)
          console.log('Waiting 3 seconds before next rollback operation...');
          await new Promise(resolve => setTimeout(resolve, 3000));
        } catch (outlineError) {
          console.error('Error during Outline rollback:', outlineError);
          console.log(`⚠️ Note: Outline collection ${outlineCollectionId} may need to be deleted manually`);
        }
      }
      
      // Attempt to delete Rocket.Chat channel
      if (rocketChatChannelId) {
        try {
          console.log(`Attempting to delete Rocket.Chat channel: ${rocketChatChannelId}`);
          const rocketChatSuccess = await this.rocketChatService.deleteChannel(rocketChatChannelId);
          rollbackStatuses.rocketchat = rocketChatSuccess;
          console.log(`Rocket.Chat channel deletion ${rocketChatSuccess ? 'successful' : 'failed'}: ${rocketChatChannelId}`);
        } catch (rocketChatError) {
          console.error('Error during Rocket.Chat rollback:', rocketChatError);
          console.log(`⚠️ Note: Rocket.Chat channel ${rocketChatChannelId} may need to be deleted manually`);
        }
      }
      
      // Provide a summary of rollback operations
      console.log('Rollback summary:', JSON.stringify(rollbackStatuses));
      
      // If any rollbacks failed, provide a note
      if (!rollbackStatuses.leantime || !rollbackStatuses.outline || !rollbackStatuses.rocketchat) {
        console.log('⚠️ Some resources may need to be deleted manually.');
      }
    } catch (error) {
      console.error('Error during rollback:', error);
      console.log('⚠️ Resources may need to be deleted manually:');
      if (leantimeProjectId) console.log(`- Leantime project: ${leantimeProjectId}`);
      if (outlineCollectionId) console.log(`- Outline collection: ${outlineCollectionId}`);
      if (rocketChatChannelId) console.log(`- Rocket.Chat channel: ${rocketChatChannelId}`);
    }
  }
}