/**
 * Type definitions for Google Cloud Monitoring service
 */
import monitoring from '@google-cloud/monitoring';
const { MetricServiceClient } = monitoring;

/**
 * Interface for Google Cloud Monitoring time series data
 */
export interface TimeSeriesData {
  metric: {
    type: string;
    labels?: Record<string, string>;
  };
  resource: {
    type: string;
    labels: Record<string, string>;
  };
  metricKind: string;
  valueType: string;
  points: Array<{
    interval: {
      startTime: string;
      endTime: string;
    };
    value: {
      boolValue?: boolean;
      int64Value?: string;
      doubleValue?: number;
      stringValue?: string;
      distributionValue?: any;
    };
  }>;
}

/**
 * Initialises the Google Cloud Monitoring client
 * 
 * @returns A configured Monitoring client
 */
export function getMonitoringClient(): any {
  return new MetricServiceClient({
    projectId: process.env.GOOGLE_CLOUD_PROJECT
  });
}

/**
 * Formats a time series data point for display
 * 
 * @param timeSeries The time series data to format
 * @returns A formatted string representation of the time series data
 */
export function formatTimeSeriesData(timeSeries: TimeSeriesData[]): string {
  if (!timeSeries || timeSeries.length === 0) {
    return 'No time series data found.';
  }
  
  let result = '';
  
  for (const series of timeSeries) {
    // Format metric information
    const metricType = series.metric.type;
    const metricLabels = series.metric.labels 
      ? Object.entries(series.metric.labels)
          .map(([k, v]) => `${k}=${v}`)
          .join(', ')
      : '';
    
    const resourceType = series.resource.type;
    const resourceLabels = Object.entries(series.resource.labels)
      .map(([k, v]) => `${k}=${v}`)
      .join(', ');
    
    result += `## Metric: ${metricType}\n`;
    result += `- Resource: ${resourceType}(${resourceLabels})\n`;
    if (metricLabels) {
      result += `- Labels: ${metricLabels}\n`;
    }
    result += `- Kind: ${series.metricKind}, Type: ${series.valueType}\n\n`;
    
    // Format data points
    result += '| Timestamp | Value |\n';
    result += '|-----------|-------|\n';
    
    for (const point of series.points) {
      const timestamp = new Date(point.interval.endTime).toISOString();
      
      // Extract the value based on valueType
      let value: string;
      if (point.value.boolValue !== undefined) {
        value = String(point.value.boolValue);
      } else if (point.value.int64Value !== undefined) {
        value = point.value.int64Value;
      } else if (point.value.doubleValue !== undefined) {
        value = point.value.doubleValue.toFixed(6);
      } else if (point.value.stringValue !== undefined) {
        value = point.value.stringValue;
      } else if (point.value.distributionValue) {
        value = 'Distribution';
      } else {
        value = 'N/A';
      }
      
      result += `| ${timestamp} | ${value} |\n`;
    }
    
    result += '\n---\n\n';
  }
  
  return result;
}