import {Component} from '@angular/core';
import {interpolate, quantize, select} from 'd3';

import {SdmDihService} from '../sdm-dih.service';

@Component({
  selector: 'year-graph',
  templateUrl: './year-graph.component.html',
  styleUrls: ['./year-graph.component.scss'],
})
export class YearGraphComponent {
  selectedYear = '';

  constructor(public sdmDihService: SdmDihService) {
    this.sdmDihService.dataLoads.subscribe(() => {
      this.selectedYear = this.sdmDihService.firstYear;
      this.redrawGraphs();
      this.drawLegend();
    });
  }

  animateGraphs() {
    const MILLISECONDS_TO_ANIMATE = 100 as const;
    let i = 1;
    for (const year of this.sdmDihService.years) {
      setTimeout(() => {
        this.selectedYear = year;
        this.redrawGraphs();
      }, MILLISECONDS_TO_ANIMATE * i);
      i++;
    }
  }

  drawGraph(region: string) {
    const year = this.selectedYear.toString().includes('.')
      ? this.selectedYear
      : this.selectedYear + '.0';
    const regionData = this.sdmDihService.sdmData[year].find(
      (row) => row['MODEL'] === region
    );
    const width = 100 / this.sdmDihService.regions.length;
    const height = 100 / this.sdmDihService.regions.length;
    // append the svg object to the div called 'year-graph-place'
    const svg = select('#year-graph-place')
      .append('svg')
      .attr('width', `${width}%`)
      .attr('height', `${height}%`)
      .append('svg')
      .attr('x', '50%')
      .attr('y', '50%')
      .attr('overflow', 'visible');
    // arrow symbol for later re-use
    const arrow = svg.append('symbol').attr('id', 'arrow');
    // horizontal line
    arrow
      .append('line')
      .attr('x1', 0)
      .attr('y1', 30)
      .attr('x2', 60)
      .attr('y2', 30)
      .attr('stroke', 'black')
      .style('stroke-width', 4);
    // upper line
    arrow
      .append('line')
      .attr('x1', 40)
      .attr('y1', 10)
      .attr('x2', 60)
      .attr('y2', 30)
      .attr('stroke', 'black')
      .style('stroke-width', 4);
    // bottom line
    arrow
      .append('line')
      .attr('x1', 40)
      .attr('y1', 50)
      .attr('x2', 60)
      .attr('y2', 30)
      .attr('stroke', 'black')
      .style('stroke-width', 4);
    const svgContent = svg.append('g').data([regionData]);
    //.attr('transform', 'translate(' + width / 2 + '% ,' + height / 2 + '% )');
    svgContent
      .append('circle')
      .attr('cx', 0)
      .attr('cy', 0)
      .attr('r', 50)
      .attr('stroke', 'black')
      .attr('fill', (d) => {
        return this.sdmDihService.perc2color(d['aggregated']);
      });
    svgContent
      .append('text')
      .attr('x', 0)
      .attr('y', -60)
      .attr('dy', '.35em')
      .text((d) => d['MODEL'])
      .style('text-anchor', 'middle');
    svgContent
      .append('text')
      .attr('x', 0)
      .attr('y', 60)
      .attr('dy', '.35em')
      .text((d) => `${(Number.parseFloat(d['aggregated']) * 100).toFixed(2)} %`)
      .style('text-anchor', 'middle');
    svgContent
      .append('text')
      .attr('x', 0)
      .attr('y', 60)
      .attr('dy', '.35em')
      .text((d) => `${(Number.parseFloat(d['aggregated']) * 100).toFixed(2)} %`)
      .style('text-anchor', 'middle');
    svgContent
      .append('use')
      .attr('xlink:href', '#arrow')
      .attr('x', -30)
      .attr('y', -30)
      .attr(
        'transform',
        // rotation is defined clockwise, hence -45 deg will turn the arrow up
        (d) => `rotate(${-45 * this.getRegionProgress(d)}, 0, 0)`
      );
  }

  drawLegend() {
    const width = 200;
    const height = 20;
    const g = select('#year-graph-legend-place')
      .append('svg')
      .attr('width', width)
      .attr('height', height)
      .attr('viewBox', [0, 0, width, height])
      .style('overflow', 'visible')
      .style('display', 'block')
      .append('g');
    for (let i = 0; i < 10; i++) {
      g.append('rect')
        .attr('x', i * 20)
        .attr('y', 0)
        .attr('width', width / 10)
        .attr('height', height / 2)
        .attr('fill', this.sdmDihService.perc2color(i / 10));
    }
    g.append('text')
      .attr('x', 0 - 10)
      .attr('y', 20)
      .attr('dy', '.5em')
      .text('0 %');
    g.append('text')
      .attr('x', 200 - 10)
      .attr('y', 20)
      .attr('dy', '.5em')
      .text('100 %');
  }

  redrawGraphs() {
    const width = 200;
    const height = 200;
    select('#year-graph-place').selectAll('svg')?.remove();
    for (const region of this.sdmDihService.regions) {
      this.drawGraph(region);
    }
  }

  getRegionProgress(regionData): -1 | 0 | 1 {
    //TODO: parametrize the PARAM_TO_COMPARE
    //TODO: use i-2, i-1 comparison based on 2 previous steps
    const PARAM_TO_COMPARE = 'aggregated';
    const region = regionData['MODEL'];
    const year = regionData['TIME_STEP'];
    const thisYearValue = +Number.parseFloat(
      regionData[PARAM_TO_COMPARE]
    ).toFixed(3);
    let pastYear = Number.parseFloat(year) - 0.25 + '';
    pastYear = pastYear.includes('.') ? pastYear : pastYear + '.0';
    const pastYearData = this.sdmDihService.sdmData[pastYear];
    if (!pastYearData) {
      // We are in the first time step, so there is nothing to compare
      return 0;
    }
    let pastYearValue = pastYearData.find(
      (regionPastYear) => regionPastYear['MODEL'] === region
    )?.[PARAM_TO_COMPARE];
    pastYearValue = +Number.parseFloat(pastYearValue).toFixed(3);
    if (pastYearValue < thisYearValue) {
      return 1;
    }
    if (pastYearValue > thisYearValue) {
      return -1;
    }
    return 0;
  }
}