import axios from 'axios';

export class N8nService {
  private webhookUrl: string;
  private rollbackWebhookUrl: string;

  constructor() {
    this.webhookUrl = process.env.N8N_WEBHOOK_URL || 'https://brain.slm-lab.net/webhook/mission-created';
    this.rollbackWebhookUrl = process.env.N8N_ROLLBACK_WEBHOOK_URL || 'https://brain.slm-lab.net/webhook/mission-rollback';
    console.log('N8nService initialized with webhook URLs:', {
      create: this.webhookUrl,
      rollback: this.rollbackWebhookUrl
    });
  }

  /**
   * Trigger the mission creation workflow in n8n
   * @param missionData The mission data to process
   * @returns The workflow execution result
   */
  async createMission(missionData: any): Promise<any> {
    try {
      console.log('Triggering n8n workflow for mission creation:', {
        name: missionData.name,
        missionType: missionData.missionType,
        webhookUrl: this.webhookUrl,
        fullData: JSON.stringify(missionData, null, 2)
      });

      const response = await axios.post(this.webhookUrl, missionData, {
        headers: {
          'Content-Type': 'application/json'
        },
        timeout: 30000 // 30 second timeout
      });

      console.log('n8n workflow response:', {
        status: response.status,
        statusText: response.statusText,
        headers: response.headers,
        data: response.data
      });

      // Handle string response
      if (typeof response.data === 'string') {
        console.log('Received string response from n8n, treating as success');
        return {
          success: true,
          results: {
            message: response.data,
            // Add default empty integration results
            leantimeProjectId: null,
            outlineCollectionId: null,
            rocketChatChannelId: null,
            giteaRepositoryUrl: null
          }
        };
      }

      if (response.data.errors && response.data.errors.length > 0) {
        console.warn('Workflow completed with partial success:', response.data.errors);
        return response.data;
      }

      if (!response.data.success) {
        console.error('Workflow execution failed:', {
          message: response.data.message,
          data: response.data
        });
        throw new Error(`Workflow execution failed: ${response.data.message || 'Unknown error'}`);
      }

      // Ensure the response has the expected structure
      const result = response.data;
      if (!result.results) {
        result.results = {
          leantimeProjectId: null,
          outlineCollectionId: null,
          rocketChatChannelId: null,
          giteaRepositoryUrl: null
        };
      }

      return result;
    } catch (error) {
      console.error('Error triggering n8n workflow:', {
        error: error instanceof Error ? error.message : String(error),
        webhookUrl: this.webhookUrl,
        errorDetails: error instanceof Error ? error.stack : undefined
      });
      throw new Error(`Failed to trigger mission creation workflow: ${error instanceof Error ? error.message : String(error)}`);
    }
  }

  /**
   * Trigger the mission rollback workflow in n8n
   * @param mission The mission to rollback
   * @returns The workflow execution result
   */
  async rollbackMission(mission: any): Promise<any> {
    try {
      console.log('Triggering n8n workflow for mission rollback:', {
        id: mission.id,
        name: mission.name,
        webhookUrl: this.rollbackWebhookUrl,
        fullData: JSON.stringify(mission, null, 2)
      });

      const response = await axios.post(this.rollbackWebhookUrl, mission, {
        headers: {
          'Content-Type': 'application/json'
        },
        timeout: 30000 // 30 second timeout
      });

      console.log('n8n rollback workflow response:', {
        status: response.status,
        statusText: response.statusText,
        headers: response.headers,
        data: response.data
      });

      // Handle string response
      if (typeof response.data === 'string') {
        console.log('Received string response from n8n rollback, treating as success');
        return {
          success: true,
          results: {
            message: response.data
          }
        };
      }

      if (response.data.errors && response.data.errors.length > 0) {
        console.warn('Rollback workflow completed with partial success:', response.data.errors);
        return response.data;
      }

      if (!response.data.success) {
        console.error('Rollback workflow execution failed:', {
          message: response.data.message,
          data: response.data
        });
        throw new Error(`Rollback workflow execution failed: ${response.data.message || 'Unknown error'}`);
      }

      return response.data;
    } catch (error) {
      console.error('Error triggering n8n rollback workflow:', {
        error: error instanceof Error ? error.message : String(error),
        webhookUrl: this.rollbackWebhookUrl,
        errorDetails: error instanceof Error ? error.stack : undefined
      });
      throw new Error(`Failed to trigger mission rollback workflow: ${error instanceof Error ? error.message : String(error)}`);
    }
  }
}