// @ts-check
import Scatter from './../charts/Scatter'
import Graphics from './Graphics'
import Filters from './Filters'

/**
 * ApexCharts DataLabels Class for drawing dataLabels on Axes based Charts.
 *
 * @module DataLabels
 **/

class DataLabels {
  /**
   * @param {import('../types/internal').ChartStateW} w
   * @param {import('../types/internal').ChartContext | null} ctx
   */
  constructor(w, ctx = null) {
    this.w = w
    this.ctx = ctx // only used for new Scatter(w, ctx) in bubble chart path
  }

  // When there are many datalabels to be printed, and some of them overlaps each other in the same series, this method will take care of that
  // Also, when datalabels exceeds the drawable area and get clipped off, we need to adjust and move some pixels to make them visible again
  /**
   * @param {number} x
   * @param {number} y
   * @param {any} val
   * @param {number} i
   * @param {number} dataPointIndex
   * @param {boolean} alwaysDrawDataLabel
   * @param {string} fontSize
   */
  dataLabelsCorrection(
    x,
    y,
    val,
    i,
    dataPointIndex,
    alwaysDrawDataLabel,
    fontSize,
  ) {
    const w = this.w
    const graphics = new Graphics(this.w)
    let drawnextLabel = false //

    const textRects = /** @type {any} */ (graphics).getTextRects(val, fontSize)
    const width = textRects.width
    const height = textRects.height

    if (y < 0) y = 0
    if (y > w.layout.gridHeight + height) y = w.layout.gridHeight + height / 2

    // first value in series, so push an empty array
    if (
      typeof /** @type {any} */ (w.globals).dataLabelsRects[i] === 'undefined'
    ) {
      ;/** @type {any} */ (w.globals).dataLabelsRects[i] = []
    }

    // then start pushing actual rects in that sub-array
    ;/** @type {any} */ (w.globals).dataLabelsRects[i].push({
      x,
      y,
      width,
      height,
    })

    const len = /** @type {any} */ (w.globals).dataLabelsRects[i].length - 2
    const lastDrawnIndex =
      typeof w.globals.lastDrawnDataLabelsIndexes[i] !== 'undefined'
        ? w.globals.lastDrawnDataLabelsIndexes[i][
            w.globals.lastDrawnDataLabelsIndexes[i].length - 1
          ]
        : 0

    if (
      typeof (/** @type {any} */ (w.globals.dataLabelsRects[i])[len]) !==
      'undefined'
    ) {
      const lastDataLabelRect = /** @type {any} */ (
        w.globals.dataLabelsRects[i]
      )[lastDrawnIndex]
      if (
        // next label forward and x not intersecting
        x > lastDataLabelRect.x + lastDataLabelRect.width ||
        y > lastDataLabelRect.y + lastDataLabelRect.height ||
        y + height < lastDataLabelRect.y ||
        x + width < lastDataLabelRect.x // next label is going to be drawn backwards
      ) {
        // the 2 indexes don't override, so OK to draw next label
        drawnextLabel = true
      }
    }

    if (dataPointIndex === 0 || alwaysDrawDataLabel) {
      drawnextLabel = true
    }

    return {
      x,
      y,
      textRects,
      drawnextLabel,
    }
  }

  /** @param {{type: any, pos: any, i: any, j: any, isRangeStart: any, strokeWidth?: any}} opts */
  drawDataLabel({ type, pos, i, j, isRangeStart, strokeWidth = 2 }) {
    // this method handles line, area, bubble, scatter charts as those charts contains markers/points which have pre-defined x/y positions
    // all other charts like radar / bars / heatmaps will define their own drawDataLabel routine
    const w = this.w

    const graphics = new Graphics(this.w)

    const dataLabelsConfig = w.config.dataLabels

    let x = 0
    let y = 0

    let dataPointIndex = j

    let elDataLabelsWrap = null

    const seriesCollapsed = w.globals.collapsedSeriesIndices.indexOf(i) !== -1

    if (seriesCollapsed || !dataLabelsConfig.enabled || !Array.isArray(pos.x)) {
      return elDataLabelsWrap
    }

    elDataLabelsWrap = graphics.group({
      class: 'apexcharts-data-labels',
    })

    for (let q = 0; q < pos.x.length; q++) {
      x = pos.x[q] + dataLabelsConfig.offsetX
      y = pos.y[q] + dataLabelsConfig.offsetY + strokeWidth

      if (!isNaN(x)) {
        // a small hack as we have 2 points for the first val to connect it
        if (j === 1 && q === 0) dataPointIndex = 0
        if (j === 1 && q === 1) dataPointIndex = 1

        let val = w.seriesData.series[i][dataPointIndex]

        if (type === 'rangeArea') {
          if (isRangeStart) {
            val = w.rangeData.seriesRangeStart[i][dataPointIndex]
          } else {
            val = w.rangeData.seriesRangeEnd[i][dataPointIndex]
          }
        }

        let text = ''

        /**
         * @param {any} v
         */
        const getText = (v) => {
          return w.config.dataLabels.formatter(v, {
            seriesIndex: i,
            dataPointIndex,
            w,
          })
        }

        if (w.config.chart.type === 'bubble') {
          val = w.seriesData.seriesZ[i][dataPointIndex]
          text = getText(val)

          y = pos.y[q]
          const scatter = new Scatter(
            this.w,
            /** @type {import('../types/internal').ChartContext} */ (this.ctx),
          )
          const centerTextInBubbleCoords = scatter.centerTextInBubble(y)
          y = centerTextInBubbleCoords.y
        } else {
          if (typeof val !== 'undefined') {
            text = getText(val)
          }
        }

        let textAnchor = w.config.dataLabels.textAnchor

        if (w.globals.isSlopeChart) {
          if (dataPointIndex === 0) {
            textAnchor = 'end'
          } else if (
            dataPointIndex ===
            /** @type {Record<string,any>} */ (w.config.series[i]).data.length - 1
          ) {
            textAnchor = 'start'
          } else {
            textAnchor = 'middle'
          }
        }

        this.plotDataLabelsText({
          x,
          y,
          text,
          i,
          j: dataPointIndex,
          parent: elDataLabelsWrap,
          offsetCorrection: true,
          dataLabelsConfig: w.config.dataLabels,
          textAnchor,
        })
      }
    }

    return elDataLabelsWrap
  }

  /**
   * @param {Record<string, any>} opts
   */
  plotDataLabelsText(opts) {
    const w = this.w
    const graphics = new Graphics(this.w)
    let {
      x,
      y,
      i,
      j,
      text,
      textAnchor,
      fontSize,
      parent,
      dataLabelsConfig,
      color,
      alwaysDrawDataLabel,
      offsetCorrection,
      className,
    } = opts

    let dataLabelText = null
    if (Array.isArray(w.config.dataLabels.enabledOnSeries)) {
      if (w.config.dataLabels.enabledOnSeries.indexOf(i) < 0) {
        return dataLabelText
      }
    }

    let correctedLabels = {
      x,
      y,
      drawnextLabel: true,
      textRects: null,
    }

    if (offsetCorrection) {
      correctedLabels = this.dataLabelsCorrection(
        x,
        y,
        text,
        i,
        j,
        alwaysDrawDataLabel,
        parseInt(
          /** @type {any} */ (dataLabelsConfig).style.fontSize,
          10,
        ).toString(),
      )
    }

    // when zoomed, we don't need to correct labels offsets,
    // but if normally, labels get cropped, correct them
    if (!w.interact.zoomed) {
      x = correctedLabels.x
      y = correctedLabels.y
    }

    if (correctedLabels.textRects) {
      // fixes #2264
      if (
        x < -20 - /** @type {any} */ (correctedLabels.textRects).width ||
        x >
          w.layout.gridWidth +
            /** @type {any} */ (correctedLabels.textRects).width +
            30
      ) {
        // datalabels fall outside drawing area, so draw a blank label
        text = ''
      }
    }

    let dataLabelColor = w.globals.dataLabels.style.colors[i]
    if (
      ((w.config.chart.type === 'bar' || w.config.chart.type === 'rangeBar') &&
        w.config.plotOptions.bar.distributed) ||
      w.config.dataLabels.distributed
    ) {
      dataLabelColor = w.globals.dataLabels.style.colors[j]
    }
    if (typeof dataLabelColor === 'function') {
      dataLabelColor = /** @type {any} */ (dataLabelColor)({
        series: w.seriesData.series,
        seriesIndex: i,
        dataPointIndex: j,
        w,
      })
    }
    if (color) {
      dataLabelColor = color
    }

    let offX = dataLabelsConfig.offsetX
    let offY = dataLabelsConfig.offsetY

    if (w.config.chart.type === 'bar' || w.config.chart.type === 'rangeBar') {
      // for certain chart types, we handle offsets while calculating datalabels pos
      // why? because bars/column may have negative values and based on that
      // offsets becomes reversed
      offX = 0
      offY = 0
    }

    if (w.globals.isSlopeChart) {
      if (j !== 0) {
        offX = dataLabelsConfig.offsetX * -2 + 5
      }
      if (
        j !== 0 &&
        j !== /** @type {Record<string,any>} */ (w.config.series[i]).data.length - 1
      ) {
        offX = 0
      }
    }

    if (correctedLabels.drawnextLabel) {
      if (textAnchor === 'middle') {
        if (x === w.layout.gridWidth) {
          // last label - might get cropped
          // fixes https://github.com/apexcharts/apexcharts.js/issues/5036
          textAnchor = 'end'
        }
      }

      dataLabelText = graphics.drawText({
        x: x + offX,
        y: y + offY,
        foreColor: dataLabelColor,
        textAnchor: textAnchor || dataLabelsConfig.textAnchor,
        text,
        fontSize: fontSize || dataLabelsConfig.style.fontSize,
        fontFamily: dataLabelsConfig.style.fontFamily,
        fontWeight: dataLabelsConfig.style.fontWeight || 'normal',
      })

      dataLabelText.attr({
        class: className || 'apexcharts-datalabel',
        cx: x,
        cy: y,
      })

      if (dataLabelsConfig.dropShadow.enabled) {
        const textShadow = dataLabelsConfig.dropShadow
        const filters = new Filters(this.w)
        filters.dropShadow(dataLabelText, textShadow)
      }

      parent.add(dataLabelText)

      if (typeof w.globals.lastDrawnDataLabelsIndexes[i] === 'undefined') {
        w.globals.lastDrawnDataLabelsIndexes[i] = []
      }

      w.globals.lastDrawnDataLabelsIndexes[i].push(j)
    }

    return dataLabelText
  }

  /**
   * @param {Element} el
   * @param {{x: number, y: number, width: number, height: number}} coords
   */
  addBackgroundToDataLabel(el, coords) {
    const w = this.w

    const bCnf = w.config.dataLabels.background

    const paddingH = bCnf.padding
    const paddingV = bCnf.padding / 2

    const width = coords.width
    const height = coords.height
    const graphics = new Graphics(this.w)
    const elRect = graphics.drawRect(
      coords.x - paddingH,
      coords.y - paddingV / 2,
      width + paddingH * 2,
      height + paddingV,
      bCnf.borderRadius,
      w.config.chart.background === 'transparent' || !w.config.chart.background
        ? '#fff'
        : w.config.chart.background,
      bCnf.opacity,
      bCnf.borderWidth,
      bCnf.borderColor,
    )

    if (bCnf.dropShadow.enabled) {
      const filters = new Filters(this.w)
      filters.dropShadow(elRect, bCnf.dropShadow)
    }

    return elRect
  }

  dataLabelsBackground() {
    const w = this.w

    if (w.config.chart.type === 'bubble') return

    const elDataLabels = w.dom.baseEl.querySelectorAll(
      '.apexcharts-datalabels text',
    )

    for (let i = 0; i < elDataLabels.length; i++) {
      const el = elDataLabels[i]
      const coords = /** @type {SVGGraphicsElement} */ (el).getBBox()
      let elRect = null

      if (coords.width && coords.height) {
        elRect = this.addBackgroundToDataLabel(el, coords)
      }
      if (elRect) {
        el.parentNode?.insertBefore(elRect.node, el)
        const background =
          w.config.dataLabels.background.backgroundColor ||
          el.getAttribute('fill')

        const shouldAnim =
          w.config.chart.animations.enabled &&
          !w.globals.resized &&
          !w.globals.dataChanged

        if (shouldAnim) {
          elRect.animate().attr({ fill: background })
        } else {
          elRect.attr({ fill: background })
        }
        el.setAttribute('fill', w.config.dataLabels.background.foreColor)
      }
    }
  }

  bringForward() {
    const w = this.w
    const elDataLabelsNodes = w.dom.baseEl.querySelectorAll(
      '.apexcharts-datalabels',
    )

    const elSeries = w.dom.baseEl.querySelector(
      '.apexcharts-plot-series:last-child',
    )

    for (let i = 0; i < elDataLabelsNodes.length; i++) {
      if (elSeries) {
        elSeries.insertBefore(elDataLabelsNodes[i], elSeries.nextSibling)
      }
    }
  }
}

export default DataLabels
