import { format } from 'date-fns'
import { useMemo, useState } from 'react'
import { Bar, BarChart, CartesianGrid, ReferenceArea, XAxis } from 'recharts'
import type { CategoricalChartFunc } from 'recharts/types/chart/generateCategoricalChart'
import { ChartConfig, ChartContainer, ChartTooltip, ChartTooltipContent, cn } from 'ui'

import { useDataTable } from './providers/DataTableProvider'

export type BaseChartSchema = { timestamp: number; [key: string]: number }
export const description = 'A stacked bar chart'

interface TimelineChartProps<TChart extends BaseChartSchema> {
  className?: string
  /**
   * The table column id to filter by - needs to be a type of `timerange` (e.g. "date").
   * TBD: if using keyof TData to be closer to the data table props
   */
  columnId: string
  /**
   * Same data as of the InfiniteQueryMeta.
   */
  data: TChart[]
  chartConfig: ChartConfig
}

export function TimelineChart<TChart extends BaseChartSchema>({
  data,
  className,
  columnId,
  chartConfig,
}: TimelineChartProps<TChart>) {
  const { table } = useDataTable()
  const [refAreaLeft, setRefAreaLeft] = useState<string | null>(null)
  const [refAreaRight, setRefAreaRight] = useState<string | null>(null)
  const [isSelecting, setIsSelecting] = useState(false)

  // REMINDER: date has to be a string for tooltip label to work - don't ask me why
  const chart = useMemo(
    () =>
      data.map((item) => ({
        ...item,
        [columnId]: new Date(item.timestamp).toString(),
      })),
    [data]
  )

  const timerange = useMemo(() => {
    if (data.length === 0) return { interval: 0, period: undefined }
    const first = data[0].timestamp
    const last = data[data.length - 1].timestamp
    const interval = Math.abs(first - last) // in ms
    return { interval, period: calculatePeriod(interval) }
  }, [data])

  const handleMouseDown: CategoricalChartFunc = (e) => {
    if (e.activeLabel) {
      setRefAreaLeft(e.activeLabel)
      setIsSelecting(true)
    }
  }

  const handleMouseMove: CategoricalChartFunc = (e) => {
    if (isSelecting && e.activeLabel) {
      setRefAreaRight(e.activeLabel)
    }
  }

  const handleMouseUp: CategoricalChartFunc = () => {
    if (refAreaLeft && refAreaRight) {
      const [left, right] = [refAreaLeft, refAreaRight].sort(
        (a, b) => new Date(a).getTime() - new Date(b).getTime()
      )
      table.getColumn(columnId)?.setFilterValue([new Date(left), new Date(right)])
    }
    setRefAreaLeft(null)
    setRefAreaRight(null)
    setIsSelecting(false)
  }

  return (
    <ChartContainer
      config={chartConfig}
      className={cn(
        'aspect-auto h-[60px] w-full',
        '[&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted/50', // otherwise same color as 200
        'select-none', // disable text selection
        className
      )}
    >
      <BarChart
        accessibilityLayer
        data={chart}
        margin={{ top: 0, left: 0, right: 0, bottom: 0 }}
        onMouseDown={handleMouseDown}
        onMouseMove={handleMouseMove}
        onMouseUp={handleMouseUp}
        onMouseLeave={handleMouseUp}
        style={{ cursor: 'crosshair' }}
      >
        <CartesianGrid vertical={false} />
        <XAxis
          dataKey={columnId}
          tickLine={false}
          minTickGap={32}
          axisLine={false}
          // interval="preserveStartEnd"
          tickFormatter={(value) => {
            const date = new Date(value)
            if (isNaN(date.getTime())) return 'N/A'
            if (timerange.period === '10m') {
              return format(date, 'HH:mm:ss')
            } else if (timerange.period === '1d') {
              return format(date, 'HH:mm')
            } else if (timerange.period === '1w') {
              return format(date, 'LLL dd HH:mm')
            }
            return format(date, 'LLL dd, y')
          }}
        />
        <ChartTooltip
          // defaultIndex={10}
          content={
            <ChartTooltipContent
              labelFormatter={(value) => {
                const date = new Date(value)
                if (isNaN(date.getTime())) return 'N/A'
                if (timerange.period === '10m') {
                  return format(date, 'LLL dd, HH:mm:ss')
                }
                return format(date, 'LLL dd, y HH:mm')
              }}
            />
          }
        />
        {/* TODO: we could use the `{timestamp, ...rest} = data[0]` to dynamically create the bars but that would mean the order can be very much random */}
        <Bar dataKey="error" stackId="a" fill="var(--color-error)" />
        <Bar dataKey="warning" stackId="a" fill="var(--color-warning)" />
        <Bar dataKey="success" stackId="a" fill="var(--color-success)" />
        {refAreaLeft && refAreaRight && (
          <ReferenceArea
            x1={refAreaLeft}
            x2={refAreaRight}
            strokeOpacity={0.3}
            fill="hsl(var(--foreground))"
            fillOpacity={0.08}
          />
        )}
      </BarChart>
    </ChartContainer>
  )
}

// TODO: check what's a good abbreviation for month vs. minutes
function calculatePeriod(interval: number): '10m' | '1d' | '1w' | '1mo' {
  if (interval <= 1000 * 60 * 10) {
    // less than 10 minutes
    return '10m'
  } else if (interval <= 1000 * 60 * 60 * 24) {
    // less than 1 day
    return '1d'
  } else if (interval <= 1000 * 60 * 60 * 24 * 7) {
    // less than 1 week
    return '1w'
  }
  return '1mo' // defaults to 1 month
}