/** Class implementing the tileChart. */
class TileChart {

  /**
   * Initializes the svg elements required to lay the tiles
   * and to populate the legend.
   */
  constructor(tooltip){

    let divTiles = d3.select("#tiles").classed("content", true);
    this.margin = {top: 30, right: 20, bottom: 30, left: 50};
    //Gets access to the div element created for this chart and legend element from HTML
    let svgBounds = divTiles.node().getBoundingClientRect();
    this.svgWidth = svgBounds.width - this.margin.left - this.margin.right;
    this.svgHeight = this.svgWidth/2;
    let legendHeight = 150;
    //add the svg to the div
    let legend = d3.select("#legend").classed("content",true);

    //creates svg elements within the div
    this.legendSvg = legend.append("svg")
      .attr("width",this.svgWidth)
      .attr("height",legendHeight)
      .attr("transform", "translate(" + this.margin.left + ",0)")
    this.svg = divTiles.append("svg")
      .attr("width",this.svgWidth)
      .attr("height",this.svgHeight)
      .attr("transform", "translate(" + this.margin.left + ",0)")

    this.tooltip = tooltip;
  };

  /**
   * Returns the class that needs to be assigned to an element.
   *
   * @param party an ID for the party that is being referred to.
   */
  chooseClass (party) {
    if (party == "R"){
      return "republican";
    }
    else if (party== "D"){
      return "democrat";
    }
    else if (party == "I"){
      return "independent";
    }
  }

  /**
   * Creates tiles and tool tip for each state, legend for encoding the
   * color scale information.
   *
   * @param electionResult election data for the year selected
   * @param colorScale global quantile scale based on the winning
   * margin between republicans and democrats
   */
  update (electionResult, colorScale){

    //Calculates the maximum number of rows and columns
    this.maxColumns = d3.max(electionResult, d => +d.Space) + 1;
    this.maxRows = d3.max(electionResult, d => +d.Row) + 1;

    // ******* TODO: PART IV *******
    //Tansform the legend element to appear in the center and make a call to this element for it to display.

    //Lay rectangles corresponding to each state according to the 'row' and 'column' information in the data.

    //Display the state abbreviation and number of electoral votes on each of these rectangles

    //Use global color scale to color code the tiles.

    //HINT: Use .tile class to style your tiles;
    // .tilestext to style the text corresponding to tiles

    //Call the tool tip on hover over the tiles to display stateName, count of electoral votes
    //then, vote percentage and number of votes won by each party.
    //HINT: Use the .republican, .democrat and .independent classes to style your elements.

      var self = this;

      let statesG = this.svg.selectAll('g')
          .data(electionResult);

      statesG.exit().remove();
      statesG = statesG.enter().append('g').merge(statesG);

      let statesRect = statesG.selectAll('rect')
          .data(function(d){
              return d3.select(this).data()
          });

      //statesRect.exit().remove();
      statesRect = statesRect.enter().append('rect').merge(statesRect);

      statesRect
          .attr('width', this.svgWidth/this.maxColumns)
          .attr('height', this.svgHeight/this.maxRows)
          .attr('x', function(d){
              return (self.svgWidth/self.maxColumns)*(parseInt(d["Space"]))
          })
          .attr('y', function(d){
              return (self.svgHeight/self.maxRows)*(parseInt(d["Row"]))
          })
          .attr('fill', function(d){
              return colorScale(d["RD_Difference"])
          })
          .attr('space-row', function(d){
              return d["Space"] + '-' + d["Row"];
          })
          .attr('stroke', '#ffffff')
          .attr('stroke-width', 1)
          .call(tip)
          .on('mouseover', tip.show)
          .on('mouseout', tip.hide)

      let statesNameText = statesG.selectAll('text').filter('.stateName')
          .data(function(d){
              return d3.select(this).data()
          });

      //statesNameText.exit().remove();
      statesNameText = statesNameText.enter().append('text').merge(statesNameText);

      statesNameText
          .attr('x', function(d){
              let startX = (self.svgWidth/self.maxColumns)*(parseInt(d["Space"]))
              return startX + (self.svgWidth/self.maxColumns)/2
          })
          .attr('y', function(d){
              let startY = (self.svgHeight/self.maxRows)*(parseInt(d["Row"]))
              return startY + (self.svgHeight/self.maxRows)/2

          })
          .attr('class', 'tilestext stateName')
          .text(function(d){
              return d["Abbreviation"]
          })
          .call(tip)
          .on('mouseover', tip.show)
          .on('mouseout', tip.hide)

      let statesEVText = statesG.selectAll('text').filter('.stateEV')
          .data(function(d){
              return d3.select(this).data()
          });

      statesEVText.exit().remove();
      statesEVText = statesEVText.enter().append('text').merge(statesEVText);

      statesEVText
          .attr('x', function(d){
              let startX = (self.svgWidth/self.maxColumns)*(parseInt(d["Space"]))
              return startX + (self.svgWidth/self.maxColumns)/2
          })
          .attr('y', function(d){
              let startY = (self.svgHeight/self.maxRows)*(parseInt(d["Row"]))
              return startY + (self.svgHeight/self.maxRows)/2 + 15;
          })
          .attr('class', 'tilestext stateEV')
          .text(function(d){
              return d["Total_EV"]
          })
          .call(tip)
          .on('mouseover', tip.show)
          .on('mouseout', tip.hide)


  };


}