/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

import { Position } from '@elastic/charts';
import Color from 'color';

import { FtrService } from '../ftr_provider_context';

const xyChartSelector = 'visTypeXyChart';
const pieChartSelector = 'visTypePieChart';

export class VisualizeChartPageObject extends FtrService {
  private readonly testSubjects = this.ctx.getService('testSubjects');
  private readonly config = this.ctx.getService('config');
  private readonly find = this.ctx.getService('find');
  private readonly log = this.ctx.getService('log');
  private readonly retry = this.ctx.getService('retry');
  private readonly kibanaServer = this.ctx.getService('kibanaServer');
  private readonly elasticChart = this.ctx.getService('elasticChart');
  private readonly dataGrid = this.ctx.getService('dataGrid');
  private readonly common = this.ctx.getPageObject('common');

  private readonly defaultFindTimeout = this.config.get('timeouts.find');

  public async getEsChartDebugState(chartSelector: string) {
    return await this.elasticChart.getChartDebugData(chartSelector);
  }

  /**
   * Is new charts library advanced setting enabled
   */
  public async isNewChartsLibraryEnabled(): Promise<boolean> {
    const legacyChartsLibrary =
      Boolean(
        (await this.kibanaServer.uiSettings.get('visualization:visualize:legacyChartsLibrary')) &&
          (await this.kibanaServer.uiSettings.get('visualization:visualize:legacyPieChartsLibrary'))
      ) ?? true;
    const enabled = !legacyChartsLibrary;
    this.log.debug(`-- isNewChartsLibraryEnabled = ${enabled}`);

    return enabled;
  }

  /**
   * Is new charts library enabled and an area, line or histogram chart exists
   */
  public async isNewLibraryChart(chartSelector: string): Promise<boolean> {
    const enabled = await this.isNewChartsLibraryEnabled();

    if (!enabled) {
      this.log.debug(`-- isNewLibraryChart = false`);
      return false;
    }

    // check if enabled but not a line, area, histogram or pie chart
    if (await this.find.existsByCssSelector('.visLib__chart', 1)) {
      const chart = await this.find.byCssSelector('.visLib__chart');
      const chartType = await chart.getAttribute('data-vislib-chart-type');

      if (!['line', 'area', 'histogram', 'pie'].includes(chartType)) {
        this.log.debug(`-- isNewLibraryChart = false`);
        return false;
      }
    }

    if (!(await this.elasticChart.hasChart(chartSelector, 1))) {
      // not be a vislib chart type
      this.log.debug(`-- isNewLibraryChart = false`);
      return false;
    }

    this.log.debug(`-- isNewLibraryChart = true`);
    return true;
  }

  /**
   * Helper method to get expected values that are slightly different
   * between vislib and elastic-chart inplementations
   * @param vislibValue value expected for vislib chart
   * @param elasticChartsValue value expected for `@elastic/charts` chart
   */
  public async getExpectedValue<T>(vislibValue: T, elasticChartsValue: T): Promise<T> {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      return elasticChartsValue;
    }

    return vislibValue;
  }

  public async getYAxisTitle() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const xAxis = (await this.getEsChartDebugState(xyChartSelector))?.axes?.y ?? [];
      return xAxis[0]?.title;
    }

    const title = await this.find.byCssSelector('.y-axis-div .y-axis-title text');
    return await title.getVisibleText();
  }

  public async getXAxisLabels() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const [xAxis] = (await this.getEsChartDebugState(xyChartSelector))?.axes?.x ?? [];
      return xAxis?.labels;
    }

    const xAxis = await this.find.byCssSelector('.visAxis--x.visAxis__column--bottom');
    const $ = await xAxis.parseDomContent();
    return $('.x > g > text')
      .toArray()
      .map((tick) => $(tick).text().trim());
  }

  public async getYAxisLabels() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const [yAxis] = (await this.getEsChartDebugState(xyChartSelector))?.axes?.y ?? [];
      return yAxis?.labels;
    }

    const yAxis = await this.find.byCssSelector('.visAxis__column--y.visAxis__column--left');
    const $ = await yAxis.parseDomContent();
    return $('.y > g > text')
      .toArray()
      .map((tick) => $(tick).text().trim());
  }

  public async getYAxisLabelsAsNumbers() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const [yAxis] = (await this.getEsChartDebugState(xyChartSelector))?.axes?.y ?? [];
      return yAxis?.values;
    }

    return (await this.getYAxisLabels()).map((label) => Number(label.replace(',', '')));
  }

  /**
   * Gets the chart data and scales it based on chart height and label.
   * @param dataLabel data-label value
   * @param axis  axis value, 'ValueAxis-1' by default
   *
   * Returns an array of height values
   */
  public async getAreaChartData(dataLabel: string, axis = 'ValueAxis-1') {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const areas = (await this.getEsChartDebugState(xyChartSelector))?.areas ?? [];
      const points = areas.find(({ name }) => name === dataLabel)?.lines.y1.points ?? [];
      return points.map(({ y }) => y);
    }

    const yAxisRatio = await this.getChartYAxisRatio(axis);

    const rectangle = await this.find.byCssSelector('rect.background');
    const yAxisHeight = Number(await rectangle.getAttribute('height'));
    this.log.debug(`height --------- ${yAxisHeight}`);

    const path = await this.retry.try(
      async () =>
        await this.find.byCssSelector(
          `path[data-label="${dataLabel}"]`,
          this.defaultFindTimeout * 2
        )
    );
    const data = await path.getAttribute('d');
    this.log.debug(data);
    // This area chart data starts with a 'M'ove to a x,y location, followed
    // by a bunch of 'L'ines from that point to the next.  Those points are
    // the values we're going to use to calculate the data values we're testing.
    // So git rid of the one 'M' and split the rest on the 'L's.
    const tempArray = data
      .replace('M ', '')
      .replace('M', '')
      .replace(/ L /g, 'L')
      .replace(/ /g, ',')
      .split('L');
    const chartSections = tempArray.length / 2;
    const chartData = [];
    for (let i = 0; i < chartSections; i++) {
      chartData[i] = Math.round((yAxisHeight - Number(tempArray[i].split(',')[1])) * yAxisRatio);
      this.log.debug('chartData[i] =' + chartData[i]);
    }
    return chartData;
  }

  /**
   * Returns the paths that compose an area chart.
   * @param dataLabel data-label value
   */
  public async getAreaChartPaths(dataLabel: string) {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const areas = (await this.getEsChartDebugState(xyChartSelector))?.areas ?? [];
      const path = areas.find(({ name }) => name === dataLabel)?.path ?? '';
      return path.split('L');
    }

    const path = await this.retry.try(
      async () =>
        await this.find.byCssSelector(
          `path[data-label="${dataLabel}"]`,
          this.defaultFindTimeout * 2
        )
    );
    const data = await path.getAttribute('d');
    this.log.debug(data);
    // This area chart data starts with a 'M'ove to a x,y location, followed
    // by a bunch of 'L'ines from that point to the next.  Those points are
    // the values we're going to use to calculate the data values we're testing.
    // So git rid of the one 'M' and split the rest on the 'L's.
    return data.split('L');
  }

  /**
   * Gets the dots and normalizes their height.
   * @param dataLabel data-label value
   * @param axis axis value, 'ValueAxis-1' by default
   */
  public async getLineChartData(dataLabel = 'Count', axis = 'ValueAxis-1') {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      // For now lines are rendered as areas to enable stacking
      const areas = (await this.getEsChartDebugState(xyChartSelector))?.areas ?? [];
      const lines = areas.map(({ lines: { y1 }, name, color }) => ({ ...y1, name, color }));
      const points = lines.find(({ name }) => name === dataLabel)?.points ?? [];
      return points.map(({ y }) => y);
    }

    // 1). get the range/pixel ratio
    const yAxisRatio = await this.getChartYAxisRatio(axis);
    // 2). find and save the y-axis pixel size (the chart height)
    const rectangle = await this.find.byCssSelector('clipPath rect');
    const yAxisHeight = Number(await rectangle.getAttribute('height'));
    // 3). get the visWrapper__chart elements
    const chartTypes = await this.retry.try(
      async () =>
        await this.find.allByCssSelector(
          `.visWrapper__chart circle[data-label="${dataLabel}"][fill-opacity="1"]`,
          this.defaultFindTimeout * 2
        )
    );
    // 4). for each chart element, find the green circle, then the cy position
    const chartData = await Promise.all(
      chartTypes.map(async (chart) => {
        const cy = Number(await chart.getAttribute('cy'));
        // the point_series_options test has data in the billions range and
        // getting 11 digits of precision with these calculations is very hard
        return Math.round(Number(((yAxisHeight - cy) * yAxisRatio).toPrecision(6)));
      })
    );

    return chartData;
  }

  /**
   * Returns bar chart data in pixels
   * @param dataLabel data-label value
   * @param axis axis value, 'ValueAxis-1' by default
   */
  public async getBarChartData(dataLabel = 'Count', axis = 'ValueAxis-1') {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const bars = (await this.getEsChartDebugState(xyChartSelector))?.bars ?? [];
      const values = bars.find(({ name }) => name === dataLabel)?.bars ?? [];
      return values.map(({ y }) => y);
    }

    const yAxisRatio = await this.getChartYAxisRatio(axis);
    const svg = await this.find.byCssSelector('div.chart');
    const $ = await svg.parseDomContent();
    const chartData = $(`g > g.series > rect[data-label="${dataLabel}"]`)
      .toArray()
      .map((chart) => {
        const barHeight = Number($(chart).attr('height'));
        return Math.round(barHeight * yAxisRatio);
      });

    return chartData;
  }

  /**
   * Returns the range/pixel ratio
   * @param axis axis value, 'ValueAxis-1' by default
   */
  private async getChartYAxisRatio(axis = 'ValueAxis-1') {
    // 1). get the maximum chart Y-Axis marker value and Y position
    const maxYAxisChartMarker = await this.retry.try(
      async () =>
        await this.find.byCssSelector(
          `div.visAxis__splitAxes--y > div > svg > g.${axis} > g:last-of-type.tick`
        )
    );
    const maxYLabel = (await maxYAxisChartMarker.getVisibleText()).replace(/,/g, '');
    const maxYLabelYPosition = (await maxYAxisChartMarker.getPosition()).y;
    this.log.debug(`maxYLabel = ${maxYLabel}, maxYLabelYPosition = ${maxYLabelYPosition}`);

    // 2). get the minimum chart Y-Axis marker value and Y position
    const minYAxisChartMarker = await this.find.byCssSelector(
      'div.visAxis__column--y.visAxis__column--left  > div > div > svg:nth-child(2) > g > g:nth-child(1).tick'
    );
    const minYLabel = (await minYAxisChartMarker.getVisibleText()).replace(',', '');
    const minYLabelYPosition = (await minYAxisChartMarker.getPosition()).y;
    return (Number(maxYLabel) - Number(minYLabel)) / (minYLabelYPosition - maxYLabelYPosition);
  }

  public async toggleLegend(show = true) {
    const isVisTypeXYChart = await this.isNewLibraryChart(xyChartSelector);
    const isVisTypePieChart = await this.isNewLibraryChart(pieChartSelector);
    const legendSelector = isVisTypeXYChart || isVisTypePieChart ? '.echLegend' : '.visLegend';

    await this.retry.try(async () => {
      const isVisible = await this.find.existsByCssSelector(legendSelector);
      if ((show && !isVisible) || (!show && isVisible)) {
        await this.testSubjects.click('vislibToggleLegend');
      }
    });
  }

  public async filterLegend(name: string) {
    await this.toggleLegend();
    await this.testSubjects.click(`legend-${name}`);
    const filterIn = await this.testSubjects.find(`legend-${name}-filterIn`);
    await filterIn.click();
    await this.waitForVisualizationRenderingStabilized();
  }

  public async doesLegendColorChoiceExist(color: string) {
    return await this.testSubjects.exists(`visColorPickerColor-${color}`);
  }

  public async selectNewLegendColorChoice(color: string) {
    await this.testSubjects.click(`visColorPickerColor-${color}`);
  }

  public async doesSelectedLegendColorExist(color: string) {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const items = (await this.getEsChartDebugState(xyChartSelector))?.legend?.items ?? [];
      return items.some(({ color: c }) => c === color);
    }

    if (await this.isNewLibraryChart(pieChartSelector)) {
      const slices =
        (await this.getEsChartDebugState(pieChartSelector))?.partition?.[0]?.partitions ?? [];
      return slices.some(({ color: c }) => {
        const rgbColor = new Color(color).rgb().toString();
        return c === rgbColor;
      });
    }

    return await this.testSubjects.exists(`legendSelectedColor-${color}`);
  }

  public async expectError() {
    if (!this.isNewLibraryChart(xyChartSelector)) {
      await this.testSubjects.existOrFail('vislibVisualizeError');
    }
  }

  public async getVisualizationRenderingCount() {
    const visualizationLoader = await this.testSubjects.find('visualizationLoader');
    const renderingCount = await visualizationLoader.getAttribute('data-rendering-count');
    return Number(renderingCount);
  }

  public async waitForRenderingCount(minimumCount = 1) {
    await this.retry.waitFor(
      `rendering count to be greater than or equal to [${minimumCount}]`,
      async () => {
        const currentRenderingCount = await this.getVisualizationRenderingCount();
        this.log.debug(`-- currentRenderingCount=${currentRenderingCount}`);
        this.log.debug(`-- expectedCount=${minimumCount}`);
        return currentRenderingCount >= minimumCount;
      }
    );
  }

  public async waitForVisualizationRenderingStabilized() {
    // assuming rendering is done when data-rendering-count is constant within 1000 ms
    await this.retry.waitFor('rendering count to stabilize', async () => {
      const firstCount = await this.getVisualizationRenderingCount();
      this.log.debug(`-- firstCount=${firstCount}`);

      await this.common.sleep(2000);

      const secondCount = await this.getVisualizationRenderingCount();
      this.log.debug(`-- secondCount=${secondCount}`);

      return firstCount === secondCount;
    });
  }

  public async waitForVisualization() {
    await this.waitForVisualizationRenderingStabilized();

    if (!(await this.isNewLibraryChart(xyChartSelector))) {
      await this.find.byCssSelector('.visualization');
    }
  }

  public async getLegendEntries() {
    const isVisTypeXYChart = await this.isNewLibraryChart(xyChartSelector);
    const isVisTypePieChart = await this.isNewLibraryChart(pieChartSelector);
    if (isVisTypeXYChart) {
      const items = (await this.getEsChartDebugState(xyChartSelector))?.legend?.items ?? [];
      return items.map(({ name }) => name);
    }

    if (isVisTypePieChart) {
      const slices =
        (await this.getEsChartDebugState(pieChartSelector))?.partition?.[0]?.partitions ?? [];
      return slices.map(({ name }) => name);
    }

    const legendEntries = await this.find.allByCssSelector(
      '.visLegend__button',
      this.defaultFindTimeout * 2
    );
    return await Promise.all(
      legendEntries.map(async (chart) => await chart.getAttribute('data-label'))
    );
  }

  public async openLegendOptionColors(name: string, chartSelector: string) {
    await this.waitForVisualizationRenderingStabilized();
    await this.retry.try(async () => {
      if (
        (await this.isNewLibraryChart(xyChartSelector)) ||
        (await this.isNewLibraryChart(pieChartSelector))
      ) {
        const chart = await this.find.byCssSelector(chartSelector);
        const legendItemColor = await chart.findByCssSelector(
          `[data-ech-series-name="${name}"] .echLegendItem__color`
        );
        legendItemColor.click();
      } else {
        // This click has been flaky in opening the legend, hence the this.retry.  See
        // https://github.com/elastic/kibana/issues/17468
        await this.testSubjects.click(`legend-${name}`);
      }

      await this.waitForVisualizationRenderingStabilized();
      // arbitrary color chosen, any available would do
      const arbitraryColor = (await this.isNewLibraryChart(xyChartSelector))
        ? '#d36086'
        : '#EF843C';
      const isOpen = await this.doesLegendColorChoiceExist(arbitraryColor);
      if (!isOpen) {
        throw new Error('legend color selector not open');
      }
    });
  }

  public async filterOnTableCell(columnIndex: number, rowIndex: number) {
    await this.retry.try(async () => {
      const cell = await this.dataGrid.getCellElement(rowIndex, columnIndex);
      await cell.click();
      const filterBtn = await this.testSubjects.findDescendant(
        'tbvChartCell__filterForCellValue',
        cell
      );
      await this.common.sleep(2000);
      filterBtn.click();
    });
  }

  public async getMarkdownText() {
    const markdownContainer = await this.testSubjects.find('markdownBody');
    return markdownContainer.getVisibleText();
  }

  public async getMarkdownBodyDescendentText(selector: string) {
    const markdownContainer = await this.testSubjects.find('markdownBody');
    const element = await this.find.descendantDisplayedByCssSelector(selector, markdownContainer);
    return element.getVisibleText();
  }

  // Table visualization

  public async getTableVisNoResult() {
    return await this.testSubjects.find('tbvChartContainer>visNoResult');
  }

  /**
   * This function returns the text displayed in the Table Vis header
   */
  public async getTableVisHeader() {
    return await this.testSubjects.getVisibleText('dataGridHeader');
  }

  public async getFieldLinkInVisTable(fieldName: string, rowIndex: number = 1) {
    const headers = await this.dataGrid.getHeaders();
    const fieldColumnIndex = headers.indexOf(fieldName);
    const cell = await this.dataGrid.getCellElement(rowIndex, fieldColumnIndex + 1);
    return await cell.findByTagName('a');
  }

  /**
   * Function to retrieve data from within a table visualization.
   */
  public async getTableVisContent({ stripEmptyRows = true } = {}) {
    return await this.retry.try(async () => {
      const container = await this.testSubjects.find('tbvChart');
      const allTables = await this.testSubjects.findAllDescendant('dataGridWrapper', container);

      if (allTables.length === 0) {
        return [];
      }

      const allData = await Promise.all(
        allTables.map(async (t) => {
          let data = await this.dataGrid.getDataFromElement(t, 'tbvChartCellContent');
          if (stripEmptyRows) {
            data = data.filter(
              (row) => row.length > 0 && row.some((cell) => cell.trim().length > 0)
            );
          }
          return data;
        })
      );

      if (allTables.length === 1) {
        // If there was only one table we return only the data for that table
        // This prevents an unnecessary array around that single table, which
        // is the case we have in most tests.
        return allData[0];
      }

      return allData;
    });
  }

  public async getMetric() {
    const elements = await this.find.allByCssSelector(
      '[data-test-subj="visualizationLoader"] .mtrVis__container'
    );
    const values = await Promise.all(
      elements.map(async (element) => {
        const text = await element.getVisibleText();
        return text;
      })
    );
    return values
      .filter((item) => item.length > 0)
      .reduce((arr: string[], item) => arr.concat(item.split('\n')), []);
  }

  public async getGaugeValue() {
    const elements = await this.find.allByCssSelector(
      '[data-test-subj="visualizationLoader"] .chart svg text'
    );
    const values = await Promise.all(
      elements.map(async (element) => {
        const text = await element.getVisibleText();
        return text;
      })
    );
    return values.filter((item) => item.length > 0);
  }

  public async getRightValueAxesCount() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const yAxes = (await this.getEsChartDebugState(xyChartSelector))?.axes?.y ?? [];
      return yAxes.filter(({ position }) => position === Position.Right).length;
    }
    const axes = await this.find.allByCssSelector('.visAxis__column--right g.axis');
    return axes.length;
  }

  public async clickOnGaugeByLabel(label: string) {
    const gauge = await this.testSubjects.find(`visGauge__meter--${label}`);
    const gaugeSize = await gauge.getSize();
    const gaugeHeight = gaugeSize.height;
    // To click at Gauge arc instead of the center of SVG element
    // the offset for a click is calculated as half arc height without 1 pixel
    const yOffset = 1 - Math.floor(gaugeHeight / 2);

    await gauge.clickMouseButton({ xOffset: 0, yOffset });
  }

  public async getHistogramSeriesCount() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const bars = (await this.getEsChartDebugState(xyChartSelector))?.bars ?? [];
      return bars.filter(({ visible }) => visible).length;
    }

    const series = await this.find.allByCssSelector('.series.histogram');
    return series.length;
  }

  public async getGridLines(): Promise<Array<{ x: number; y: number }>> {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const { x, y } = (await this.getEsChartDebugState(xyChartSelector))?.axes ?? {
        x: [],
        y: [],
      };
      return [...x, ...y].flatMap(({ gridlines }) => gridlines);
    }

    const grid = await this.find.byCssSelector('g.grid');
    const $ = await grid.parseDomContent();
    return $('path')
      .toArray()
      .map((line) => {
        const dAttribute = $(line).attr('d');
        const firstPoint = dAttribute.split('L')[0].replace('M', '').split(',');
        return {
          x: parseFloat(firstPoint[0]),
          y: parseFloat(firstPoint[1]),
        };
      });
  }

  public async getChartValues() {
    if (await this.isNewLibraryChart(xyChartSelector)) {
      const barSeries = (await this.getEsChartDebugState(xyChartSelector))?.bars ?? [];
      return barSeries.filter(({ visible }) => visible).flatMap((bars) => bars.labels);
    }

    const elements = await this.find.allByCssSelector('.series.histogram text');
    const values = await Promise.all(
      elements.map(async (element) => {
        const text = await element.getVisibleText();
        return text;
      })
    );
    return values;
  }
}