import { Component, OnInit, Input, OnChanges, SimpleChanges } from '@angular/core';
import { Dashboard3Service } from 'src/app/services/builder/dashboard3.service';

@Component({
  selector: 'app-line-chart',
  templateUrl: './line-chart.component.html',
  styleUrls: ['./line-chart.component.scss']
})
export class LineChartComponent implements OnInit, OnChanges {
  @Input() xAxis: string;
  @Input() yAxis: string | string[];
  @Input() table: string;
  @Input() datastore: string;
  @Input() charttitle: string;
  @Input() chartlegend: boolean = true;
  @Input() showlabel: boolean = true;
  @Input() chartcolor: boolean;
  @Input() slices: boolean;
  @Input() donut: boolean;
  @Input() charturl: string;
  @Input() chartparameter: string;
  @Input() datasource: string;
  @Input() fieldName: string;
  @Input() connection: number; // Add connection input
  // Drilldown configuration inputs
  @Input() drilldownEnabled: boolean = false;
  @Input() drilldownApiUrl: string;
  @Input() drilldownXAxis: string;
  @Input() drilldownYAxis: string;
  @Input() drilldownParameter: string; // Add drilldown parameter input
  // Multi-layer drilldown configuration inputs
  @Input() drilldownLayers: any[] = []; // Array of drilldown layer configurations

  public lineChartData: Array<any> = [
    {data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A'},
    {data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B'},
    {data: [18, 48, 77, 9, 100, 27, 40], label: 'Series C'}
  ];
  public lineChartLabels: Array<any> = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
  public lineChartOptions: any = {
    responsive: true
  };
  public lineChartColors: Array<any> = [
    { // grey
      backgroundColor: 'rgba(148,159,177,0.2)',
      borderColor: 'rgba(148,159,177,1)',
      pointBackgroundColor: 'rgba(148,159,177,1)',
      pointBorderColor: '#fff',
      pointHoverBackgroundColor: '#fff',
      pointHoverBorderColor: 'rgba(148,159,177,0.8)'
    },
    { // dark grey
      backgroundColor: 'rgba(77,83,96,0.2)',
      borderColor: 'rgba(77,83,96,1)',
      pointBackgroundColor: 'rgba(77,83,96,1)',
      pointBorderColor: '#fff',
      pointHoverBackgroundColor: '#fff',
      pointHoverBorderColor: 'rgba(77,83,96,1)'
    },
    { // grey
      backgroundColor: 'rgba(148,159,177,0.2)',
      borderColor: 'rgba(148,159,177,1)',
      pointBackgroundColor: 'rgba(148,159,177,1)',
      pointBorderColor: '#fff',
      pointHoverBackgroundColor: '#fff',
      pointHoverBorderColor: 'rgba(148,159,177,0.8)'
    }
  ];
  public lineChartLegend: boolean = true;
  public lineChartType: string = 'line';
  
  // Multi-layer drilldown state tracking
  drilldownStack: any[] = []; // Stack to track drilldown navigation history
  currentDrilldownLevel: number = 0; // Current drilldown level (0 = base level)
  originalLineChartLabels: Array<any> = [];
  originalLineChartData: Array<any> = [];
  
  // No data state
  noDataAvailable: boolean = false;

  constructor(private dashboardService: Dashboard3Service) { }

  ngOnInit(): void {
    // Initialize with default data
    this.fetchChartData();
  }

  ngOnChanges(changes: SimpleChanges): void {
    console.log('LineChartComponent input changes:', changes);
    
    // Check if any of the key properties have changed
    const xAxisChanged = changes.xAxis && !changes.xAxis.firstChange;
    const yAxisChanged = changes.yAxis && !changes.yAxis.firstChange;
    const tableChanged = changes.table && !changes.table.firstChange;
    const connectionChanged = changes.connection && !changes.connection.firstChange;
    // Drilldown configuration changes
    const drilldownEnabledChanged = changes.drilldownEnabled && !changes.drilldownEnabled.firstChange;
    const drilldownApiUrlChanged = changes.drilldownApiUrl && !changes.drilldownApiUrl.firstChange;
    const drilldownXAxisChanged = changes.drilldownXAxis && !changes.drilldownXAxis.firstChange;
    const drilldownYAxisChanged = changes.drilldownYAxis && !changes.drilldownYAxis.firstChange;
    const drilldownLayersChanged = changes.drilldownLayers && !changes.drilldownLayers.firstChange;
    
    // Respond to input changes
    if (xAxisChanged || yAxisChanged || tableChanged || connectionChanged || 
        drilldownEnabledChanged || drilldownApiUrlChanged || drilldownXAxisChanged || drilldownYAxisChanged ||
        drilldownLayersChanged) {
      console.log('X or Y axis or table or connection or drilldown config changed, fetching new data');
      // Only fetch data if xAxis, yAxis, table, connection, or drilldown config has changed (and it's not the first change)
      this.fetchChartData();
    }
    
    // Update legend visibility if it changed
    if (changes.chartlegend !== undefined) {
      this.lineChartLegend = changes.chartlegend.currentValue;
      console.log('Chart legend changed to:', this.lineChartLegend);
    }
  }

  fetchChartData(): void {
    // If we're in drilldown mode, fetch the appropriate drilldown data
    if (this.currentDrilldownLevel > 0 && this.drilldownStack.length > 0) {
      this.fetchDrilldownData();
      return;
    }
    
    // If we have the necessary data, fetch chart data from the service
    if (this.table && this.xAxis && this.yAxis) {
      console.log('Fetching chart data for:', { table: this.table, xAxis: this.xAxis, yAxis: this.yAxis, connection: this.connection });
      
      // Convert yAxis to string if it's an array
      const yAxisString = Array.isArray(this.yAxis) ? this.yAxis.join(',') : this.yAxis;
      
      // Log the URL that will be called
      const url = `chart/getdashjson/line?tableName=${this.table}&xAxis=${this.xAxis}&yAxes=${yAxisString}${this.connection ? `&sureId=${this.connection}` : ''}`;
      console.log('Chart data URL:', url);
      
      // Fetch data from the dashboard service with parameter field and value
      // For base level, we pass empty parameter and value
      this.dashboardService.getChartData(this.table, 'line', this.xAxis, yAxisString, this.connection, '', '').subscribe(
        (data: any) => {
          console.log('Received chart data:', data);
          if (data === null) {
            console.warn('API returned null data. Check if the API endpoint is working correctly.');
            this.noDataAvailable = true;
            this.lineChartLabels = [];
            this.lineChartData = [];
            return;
          }
          
          // Handle the actual data structure returned by the API
          if (data && data.chartLabels && data.chartData) {
            // Backend has already filtered the data, just display it
            this.noDataAvailable = data.chartLabels.length === 0;
            this.lineChartLabels = data.chartLabels;
            this.lineChartData = data.chartData;
            // Trigger change detection
            this.lineChartData = [...this.lineChartData];
            console.log('Updated line chart with data:', { labels: this.lineChartLabels, data: this.lineChartData });
          } else if (data && data.labels && data.datasets) {
            // Backend has already filtered the data, just display it
            this.noDataAvailable = data.labels.length === 0;
            this.lineChartLabels = data.labels;
            this.lineChartData = data.datasets;
            // Trigger change detection
            this.lineChartData = [...this.lineChartData];
            console.log('Updated line chart with legacy data format:', { labels: this.lineChartLabels, data: this.lineChartData });
          } else {
            console.warn('Received data does not have expected structure', data);
            this.noDataAvailable = true;
            this.lineChartLabels = [];
            this.lineChartData = [];
          }
        },
        (error) => {
          console.error('Error fetching chart data:', error);
          this.noDataAvailable = true;
          this.lineChartLabels = [];
          this.lineChartData = [];
          // Keep default data in case of error
        }
      );
    } else {
      console.log('Missing required data for chart:', { table: this.table, xAxis: this.xAxis, yAxis: this.yAxis, connection: this.connection });
      this.noDataAvailable = true;
      this.lineChartLabels = [];
      this.lineChartData = [];
    }
  }
  
  // Fetch drilldown data based on current drilldown level
  fetchDrilldownData(): void {
    console.log('Fetching drilldown data, current level:', this.currentDrilldownLevel);
    console.log('Drilldown stack:', this.drilldownStack);
    
    // Get the current drilldown configuration based on the current level
    let drilldownConfig;
    if (this.currentDrilldownLevel === 1) {
      // Base drilldown level
      drilldownConfig = {
        apiUrl: this.drilldownApiUrl,
        xAxis: this.drilldownXAxis,
        yAxis: this.drilldownYAxis,
        parameter: this.drilldownParameter
      };
    } else {
      // Multi-layer drilldown level
      const layerIndex = this.currentDrilldownLevel - 2; // -2 because level 1 is base drilldown
      if (layerIndex >= 0 && layerIndex < this.drilldownLayers.length) {
        drilldownConfig = this.drilldownLayers[layerIndex];
      } else {
        console.warn('Invalid drilldown layer index:', layerIndex);
        this.noDataAvailable = true;
        this.lineChartLabels = [];
        this.lineChartData = [];
        return;
      }
    }
    
    console.log('Drilldown config for level', this.currentDrilldownLevel, ':', drilldownConfig);
    
    // Check if we have valid drilldown configuration
    if (!drilldownConfig || !drilldownConfig.apiUrl || !drilldownConfig.xAxis || !drilldownConfig.yAxis) {
      console.warn('Missing drilldown configuration for level:', this.currentDrilldownLevel);
      this.noDataAvailable = true;
      this.lineChartLabels = [];
      this.lineChartData = [];
      return;
    }
    
    // Get the parameter value from the drilldown stack
    let parameterValue = '';
    if (this.drilldownStack.length > 0) {
      const lastEntry = this.drilldownStack[this.drilldownStack.length - 1];
      parameterValue = lastEntry.clickedValue || '';
      console.log('Parameter value from last click:', parameterValue);
    }
    
    // Get the parameter field from drilldown config
    const parameterField = drilldownConfig.parameter || '';
    console.log('Parameter field:', parameterField);
    
    console.log('Fetching drilldown data for level:', this.currentDrilldownLevel, {
      apiUrl: drilldownConfig.apiUrl,
      xAxis: drilldownConfig.xAxis,
      yAxis: drilldownConfig.yAxis,
      parameterField: parameterField,
      parameterValue: parameterValue,
      connection: this.connection
    });
    
    // Build the actual API URL with parameter replacement
    let actualApiUrl = drilldownConfig.apiUrl;
    console.log('Original API URL:', actualApiUrl);
    console.log('Parameter value to use:', parameterValue);
    console.log('Parameter field:', parameterField);
    
    // Check if the URL contains angle brackets for parameter replacement
    const hasAngleBrackets = /<[^>]+>/.test(actualApiUrl);
    
    if (hasAngleBrackets && parameterValue) {
      // Replace angle brackets placeholder with actual value
      console.log('Replacing angle brackets with parameter value');
      const encodedValue = encodeURIComponent(parameterValue);
      actualApiUrl = actualApiUrl.replace(/<[^>]+>/g, encodedValue);
      console.log('URL after angle bracket replacement:', actualApiUrl);
    }
    
    // Log the URL that will be called
    const url = `chart/getdashjson/line?tableName=${actualApiUrl}&xAxis=${drilldownConfig.xAxis}&yAxes=${drilldownConfig.yAxis}${this.connection ? `&sureId=${this.connection}` : ''}`;
    console.log('Drilldown data URL:', url);
    
    // Fetch data from the dashboard service with parameter field and value
    // Backend handles filtering, we just pass the parameter field and value
    this.dashboardService.getChartData(actualApiUrl, 'line', drilldownConfig.xAxis, drilldownConfig.yAxis, this.connection, parameterField, parameterValue).subscribe(
      (data: any) => {
        console.log('Received drilldown data:', data);
        if (data === null) {
          console.warn('Drilldown API returned null data. Check if the API endpoint is working correctly.');
          this.noDataAvailable = true;
          this.lineChartLabels = [];
          this.lineChartData = [];
          return;
        }
        
        // Handle the actual data structure returned by the API
        if (data && data.chartLabels && data.chartData) {
          // Backend has already filtered the data, just display it
          this.noDataAvailable = data.chartLabels.length === 0;
          this.lineChartLabels = data.chartLabels;
          this.lineChartData = data.chartData;
          // Trigger change detection
          this.lineChartData = [...this.lineChartData];
          console.log('Updated line chart with drilldown data:', { labels: this.lineChartLabels, data: this.lineChartData });
        } else if (data && data.labels && data.datasets) {
          // Backend has already filtered the data, just display it
          this.noDataAvailable = data.labels.length === 0;
          this.lineChartLabels = data.labels;
          this.lineChartData = data.datasets;
          // Trigger change detection
          this.lineChartData = [...this.lineChartData];
          console.log('Updated line chart with drilldown legacy data format:', { labels: this.lineChartLabels, data: this.lineChartData });
        } else {
          console.warn('Drilldown received data does not have expected structure', data);
          this.noDataAvailable = true;
          this.lineChartLabels = [];
          this.lineChartData = [];
        }
      },
      (error) => {
        console.error('Error fetching drilldown data:', error);
        this.noDataAvailable = true;
        this.lineChartLabels = [];
        this.lineChartData = [];
        // Keep current data in case of error
      }
    );
  }
  
  // Reset to original data (go back to base level)
  resetToOriginalData(): void {
    console.log('Resetting to original data');
    console.log('Current stack before reset:', this.drilldownStack);
    console.log('Current level before reset:', this.currentDrilldownLevel);
    
    this.currentDrilldownLevel = 0;
    this.drilldownStack = [];
    
    if (this.originalLineChartLabels.length > 0) {
      this.lineChartLabels = [...this.originalLineChartLabels];
      console.log('Restored original labels');
    }
    if (this.originalLineChartData.length > 0) {
      this.lineChartData = [...this.originalLineChartData];
      console.log('Restored original data');
    }
    
    console.log('After reset - labels:', this.lineChartLabels);
    console.log('After reset - data:', this.lineChartData);
    
    // Re-fetch original data
    this.fetchChartData();
  }

  // Navigate back to previous drilldown level
  navigateBack(): void {
    console.log('Navigating back, current stack:', this.drilldownStack);
    console.log('Current level:', this.currentDrilldownLevel);
    
    if (this.drilldownStack.length > 0) {
      // Remove the last entry from the stack
      const removedEntry = this.drilldownStack.pop();
      console.log('Removed entry from stack:', removedEntry);
      
      // Update the current drilldown level
      this.currentDrilldownLevel = this.drilldownStack.length;
      console.log('New level after pop:', this.currentDrilldownLevel);
      console.log('Stack after pop:', this.drilldownStack);
      
      if (this.drilldownStack.length > 0) {
        // Fetch data for the previous level
        console.log('Fetching data for previous level');
        this.fetchDrilldownData();
      } else {
        // Back to base level
        console.log('Back to base level, resetting to original data');
        this.resetToOriginalData();
      }
    } else {
      // Already at base level, reset to original data
      console.log('Already at base level, resetting to original data');
      this.resetToOriginalData();
    }
  }

  public randomize(): void {
    let _lineChartData: Array<any> = new Array(this.lineChartData.length);
    for (let i = 0; i < this.lineChartData.length; i++) {
      _lineChartData[i] = {data: new Array(this.lineChartData[i].data.length), label: this.lineChartData[i].label};
      for (let j = 0; j < this.lineChartData[i].data.length; j++) {
        _lineChartData[i].data[j] = Math.floor((Math.random() * 100) + 1);
      }
    }
    this.lineChartData = _lineChartData;
  }

  // events
  public chartClicked(e: any): void {
    console.log('Line chart clicked:', e);
    
    // If drilldown is enabled and we have a valid click event
    if (this.drilldownEnabled && e.active && e.active.length > 0) {
      // Get the index of the clicked element
      const clickedIndex = e.active[0].index;
      
      // Get the label of the clicked element
      const clickedLabel = this.lineChartLabels[clickedIndex];
      
      console.log('Clicked on line point:', { index: clickedIndex, label: clickedLabel });
      
      // If we're not at the base level, store original data
      if (this.currentDrilldownLevel === 0) {
        // Store original data before entering drilldown mode
        this.originalLineChartLabels = [...this.lineChartLabels];
        this.originalLineChartData = [...this.lineChartData];
        console.log('Stored original data for drilldown');
      }
      
      // Determine the next drilldown level
      const nextDrilldownLevel = this.currentDrilldownLevel + 1;
      
      console.log('Next drilldown level will be:', nextDrilldownLevel);
      
      // Check if there's a drilldown configuration for this level
      let hasDrilldownConfig = false;
      let drilldownConfig;
      
      if (nextDrilldownLevel === 1) {
        // Base drilldown level
        drilldownConfig = {
          apiUrl: this.drilldownApiUrl,
          xAxis: this.drilldownXAxis,
          yAxis: this.drilldownYAxis,
          parameter: this.drilldownParameter
        };
        hasDrilldownConfig = !!this.drilldownApiUrl && !!this.drilldownXAxis && !!this.drilldownYAxis;
      } else {
        // Multi-layer drilldown level
        const layerIndex = nextDrilldownLevel - 2; // -2 because level 1 is base drilldown
        if (layerIndex < this.drilldownLayers.length) {
          drilldownConfig = this.drilldownLayers[layerIndex];
          hasDrilldownConfig = drilldownConfig.enabled &&
                              !!drilldownConfig.apiUrl && 
                              !!drilldownConfig.xAxis && 
                              !!drilldownConfig.yAxis;
        }
      }
      
      console.log('Drilldown config for next level:', drilldownConfig);
      console.log('Has drilldown config:', hasDrilldownConfig);
      
      // If there's a drilldown configuration for the next level, proceed
      if (hasDrilldownConfig) {
        // Add this click to the drilldown stack
        const stackEntry = {
          level: nextDrilldownLevel,
          clickedIndex: clickedIndex,
          clickedLabel: clickedLabel,
          clickedValue: clickedLabel // Using label as value for now
        };
        
        this.drilldownStack.push(stackEntry);
        
        console.log('Added to drilldown stack:', stackEntry);
        console.log('Current drilldown stack:', this.drilldownStack);
        
        // Update the current drilldown level
        this.currentDrilldownLevel = nextDrilldownLevel;
        
        console.log('Entering drilldown level:', this.currentDrilldownLevel);
        
        // Fetch drilldown data for the new level
        this.fetchDrilldownData();
      } else {
        console.log('No drilldown configuration for level:', nextDrilldownLevel);
      }
    } else {
      console.log('Drilldown not enabled or invalid click event');
    }
  }

  public chartHovered(e: any): void {
    console.log(e);
  }
}