<script>
  import { getColorSchema, getChartGradient, notNull } from "./utils"
  import britecharts from "britecharts"
  import { onMount } from "svelte"

  import { select } from "d3-selection"
  import shortid from "shortid"

  /* 
  ISSUES - Doesn't seem to allow color change. Chart is colored black by default
  */

  const _id = shortid.generate()

  export let _bb
  export let table

  let store = _bb.store

  const chart = britecharts.step()
  const chartClass = `step-container-${_id}`
  const legendClass = `legend-container-${_id}`

  let chartElement = null
  let chartContainer = null
  let tooltip
  let tooltipContainer

  export let customMouseOver = () => tooltip.show()
  export let customMouseMove = (
    dataPoint,
    colorMapping,
    xPosition,
    yPosition = null
  ) => tooltip.update(dataPoint, colorMapping, xPosition, (yPosition = null))
  export let customMouseOut = () => tooltip.hide()

  export let data = []
  export let height = null
  export let width = null
  export let margin = null
  export let xAxisLabel = null
  export let xAxisLabelOffset = null
  export let yAxisLabel = null
  export let yAxisLabelOffset = null
  export let yTicks = null
  export let useLegend = true

  onMount(async () => {
    if (chart) {
      if (table) {
        await fetchData()
      }
      chartContainer = select(`.${chartClass}`)
      bindChartUIProps()
      bindChartEvents()
      chartContainer.datum(_data).call(chart)
      bindChartTooltip()
    }
  })

  async function fetchData() {
    const FETCH_ROWS_URL = `/api/views/all_${table}`
    const response = await _bb.api.get(FETCH_ROWS_URL)
    if (response.status === 200) {
      const json = await response.json()
      store.update(state => {
        state[table] = json
        return state
      })
    } else {
      throw new Error("Failed to fetch rows.", response)
    }
  }

  function bindChartUIProps() {
    if (notNull(height)) {
      chart.height(height)
    }
    if (notNull(width)) {
      chart.width(width)
    }
    if (notNull(margin)) {
      chart.margin(margin)
    }
    if (notNull(xAxisLabel)) {
      chart.xAxisLabel(xAxisLabel)
    }
    if (notNull(xAxisLabelOffset)) {
      chart.xAxisLabelOffset(xAxisLabelOffset)
    }
    if (notNull(yAxisLabel)) {
      chart.yAxisLabel(yAxisLabel)
    }
    if (notNull(yAxisLabelOffset)) {
      chart.yAxisLabelOffset(yAxisLabelOffset)
    }
    if (notNull(yTicks)) {
      chart.yTicks(yTicks)
    }
  }

  function bindChartEvents() {
    if (customMouseMove) {
      chart.on("customMouseMove", customMouseMove)
    }
    if (customMouseOut) {
      chart.on("customMouseOut", customMouseOut)
    }
    if (customMouseOver) {
      chart.on("customMouseOver", customMouseOver)
    }
  }

  function bindChartTooltip() {
    tooltip = britecharts.miniTooltip()
    tooltipContainer = select(`.${chartClass} .metadata-group`)
    tooltipContainer.datum([]).call(tooltip)
  }

  $: _data = table ? $store[table] : data

  $: colorSchema = getColorSchema(color)
</script>

<div bind:this={chartElement} class={chartClass} />
{#if useLegend}
  <div class={legendClass} />
{/if}
