import * as plotly from "plotly.js-dist"
import React, { ChangeEvent, FC, useEffect, useState } from "react"
import {
  Grid,
  FormControl,
  FormLabel,
  InputLabel,
  MenuItem,
  Select,
} from "@material-ui/core"
import { createStyles, makeStyles, Theme } from "@material-ui/core/styles"

const plotDomId = "graph-contour"

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    formControl: {
      marginBottom: theme.spacing(2),
      marginRight: theme.spacing(2),
    },
  })
)

export const GraphContour: FC<{
  study: StudyDetail | null
}> = ({ study = null }) => {
  const trials: Trial[] = study !== null ? study.trials : []
  const filteredTrials = trials.filter(
    (t) => t.state === "Complete" || t.state === "Pruned"
  )

  let paramNames = new Set<string>(trials[0].params.map((p) => p.name))
  filteredTrials.forEach((t) => {
    paramNames = new Set<string>(
      t.params.filter((p) => paramNames.has(p.name)).map((p) => p.name)
    )
  })

  const paramnames = Array.from(paramNames)

  const classes = useStyles()
  const [objectiveId, setObjectiveId] = useState<number>(0)
  const [xAxis, setXAxis] = useState<string>(paramnames[0])
  const [yAxis, setYAxis] = useState<string>(paramnames[1])

  const handleObjectiveChange = (
    event: React.ChangeEvent<{ value: unknown }>
  ) => {
    setObjectiveId(event.target.value as number)
  }

  const handleXAxisChange = (e: ChangeEvent<{ value: unknown }>) => {
    setXAxis(e.target.value as string)
  }

  const handleYAxisChange = (e: ChangeEvent<{ value: unknown }>) => {
    setYAxis(e.target.value as string)
  }

  useEffect(() => {
    if (study !== null) {
      plotContour(study, objectiveId, xAxis, yAxis)
    }
  }, [study, objectiveId, xAxis, yAxis])

  return (
    <Grid container direction="row">
      <Grid item xs={3}>
        <Grid container direction="column">
          {study !== null && study.directions.length !== 1 ? (
            <FormControl component="fieldset" className={classes.formControl}>
              <FormLabel component="legend">Objective ID:</FormLabel>
              <Select value={objectiveId} onChange={handleObjectiveChange}>
                {study.directions.map((d, i) => (
                  <MenuItem value={i} key={i}>
                    {i}
                  </MenuItem>
                ))}
              </Select>
            </FormControl>
          ) : null}
          <FormControl component="fieldset" className={classes.formControl}>
            <InputLabel id="parameter1">X Axis Parameter</InputLabel>
            <Select value={xAxis} onChange={handleXAxisChange}>
              {paramnames.map((x) => (
                <MenuItem value={x} key={x}>
                  {x}
                </MenuItem>
              ))}
            </Select>
          </FormControl>
          <FormControl component="fieldset" className={classes.formControl}>
            <InputLabel id="parameter2">Y Axis Parameter</InputLabel>
            <Select value={yAxis} onChange={handleYAxisChange}>
              {paramnames.map((x) => (
                <MenuItem value={x} key={x}>
                  {x}
                </MenuItem>
              ))}
            </Select>
          </FormControl>
        </Grid>
      </Grid>
      <Grid item xs={6}>
        <div id={plotDomId} />
      </Grid>
    </Grid>
  )
}

const plotContour = (
  study: StudyDetail,
  objectiveId: number,
  xAxis: string,
  yAxis: string
) => {
  if (document.getElementById(plotDomId) === null) {
    return
  }

  const layout: Partial<plotly.Layout> = {
    title: "Contour",
    margin: {
      l: 50,
      r: 50,
    },
  }

  const trials: Trial[] = study !== null ? study.trials : []

  if (trials.length === 0) {
    plotly.react(plotDomId, [], layout)
  }

  const filteredTrials = trials.filter(
    (t) => t.state === "Complete" || t.state === "Pruned"
  )

  let paramNames = new Set<string>(trials[0].params.map((p) => p.name))
  filteredTrials.forEach((t) => {
    paramNames = new Set<string>(
      t.params.filter((p) => paramNames.has(p.name)).map((p) => p.name)
    )
  })

  if (paramNames.size === 0 || paramNames.size === 1) {
    plotly.react(plotDomId, [])
    return
  }
  if (xAxis === yAxis) {
    plotly.react(plotDomId, [], {
      xaxis: {
        gridcolor: "#f2f5fa",
        gridwidth: 1,
        zerolinecolor: "#f2f5fa",
        zerolinewidth: 1.5,
      },
      yaxis: {
        gridcolor: "#f2f5fa",
        gridwidth: 1,
        zerolinecolor: "#f2f5fa",
        zerolinewidth: 1.5,
      },
      plot_bgcolor: "#E5ecf6",
    })
    return
  }

  const objectiveValues: number[] = filteredTrials.map(
    (t) => t.values![objectiveId]
  )

  const paramValues: { [key: number]: string[] } = []
  const paramIndices: Array<string> = []

  if (paramNames.size >= 2) {
    let i = 0
    paramNames.forEach((paramName) => {
      const valueStrings = filteredTrials.map((t) => {
        const param = t.params.find((p) => p.name == paramName)
        return param!.value
      })
      paramValues[i] = valueStrings
      i++
    })

    let k = 0
    paramNames.forEach((paramName) => {
      paramIndices[k] = paramName
      k++
    })
    const paramCategorical = { ...paramValues }
    const xIndex = paramIndices.indexOf(xAxis)
    const yIndex = paramIndices.indexOf(yAxis)

    const x_indice = paramCategorical[xIndex].sort((a, b) => (a > b ? 1 : -1))
    const y_indice = paramCategorical[yIndex].sort((a, b) => (a > b ? 1 : -1))

    const x_indices: string[] = []
    const y_indices: string[] = []

    x_indice.forEach((element) => {
      if (!x_indices.includes(element)) {
        x_indices.push(element)
      }
    })

    y_indice.forEach((element) => {
      if (!y_indices.includes(element)) {
        y_indices.push(element)
      }
    })

    const z: number[][] = []
    for (let j = 0; j < y_indices.length; j++) {
      z[j] = []
    }
    for (let j = 0; j < filteredTrials.length; j++) {
      const x_i = x_indices.indexOf(paramValues[xIndex][j])
      const y_i = y_indices.indexOf(paramValues[yIndex][j])
      z[y_i][x_i] = objectiveValues[j]
    }

    const data: Partial<plotly.PlotData>[] = [
      {
        type: "contour",
        z: z,
        x: x_indices,
        y: y_indices,
        mode: "markers",
        marker: {
          color: "#000",
        },
        line: {
          color: "#000",
        },
        //@ts-ignore
        colorbar: {
          title: "Objective Value",
        },
        colorscale: "Blues",
        connectgaps: true,
        contours_coloring: "heatmap",
        hoverinfo: "none",
        line_smoothing: 1.3,
      },
      {
        type: "scatter",
        x: paramValues[xIndex],
        y: paramValues[yIndex],
        mode: "markers",
        marker: {
          color: "#000",
        },
      },
    ]
    const updateLayout: Partial<plotly.Layout> = {
      title: "Contour",
      margin: {
        l: 50,
        r: 50,
      },
      xaxis: {
        gridcolor: "#f2f5fa",
        gridwidth: 1,
        zerolinecolor: "#f2f5fa",
        zerolinewidth: 1.5,
      },
      yaxis: {
        gridcolor: "#f2f5fa",
        gridwidth: 1,
        zerolinecolor: "#f2f5fa",
        zerolinewidth: 1.5,
      },
      plot_bgcolor: "#E5ecf6",
    }

    plotly.react(plotDomId, data, updateLayout)
  }
}