'use client'

import { useState, useRef, useEffect, useId } from 'react'
import { subMonths, format } from 'lib/utils'
import { useAIState } from 'ai/rsc'

interface Stock {
  symbol: string
  price: number
  delta: number
}

function scaleLinear(domain: [number, number], range: [number, number]) {
  const [d0, d1] = domain
  const [r0, r1] = range

  return function scale(value: number): number {
    return r0 + ((value - d0) / (d1 - d0)) * (r1 - r0)
  }
}

function useResizeObserver<T extends HTMLElement = HTMLElement>(
  ref: React.RefObject<T>
) {
  const [size, setSize] = useState({ width: 0, height: 0 })

  useEffect(() => {
    if (!ref.current) return

    const observer = new ResizeObserver(([entry]) => {
      if (entry.borderBoxSize && entry.borderBoxSize.length > 0) {
        setSize({
          width: entry.borderBoxSize[0].inlineSize,
          height: entry.borderBoxSize[0].blockSize
        })
      } else {
        // Fallback for browsers that don't support borderBoxSize
        const { width, height } = entry.target.getBoundingClientRect()
        setSize({ width, height })
      }
    })

    observer.observe(ref.current)
    return () => observer.disconnect()
  }, [ref])

  return size
}

export function Stock({ props: { symbol, price, delta } }: { props: Stock }) {
  const [aiState, setAIState] = useAIState()
  const id = useId()

  const [priceAtTime, setPriceAtTime] = useState({
    time: '00:00',
    value: price.toFixed(2),
    x: 0
  })

  const [startHighlight, setStartHighlight] = useState(0)
  const [endHighlight, setEndHighlight] = useState(0)

  const chartRef = useRef<HTMLDivElement>(null)
  const { width = 0 } = useResizeObserver(chartRef)

  const xToDate = scaleLinear(
    [0, width],
    [subMonths(new Date(), 6).getTime(), new Date().getTime()]
  )

  const xToValue = scaleLinear(
    [0, width],
    [price - price / 2, price + price / 2]
  )

  useEffect(() => {
    if (startHighlight && endHighlight) {
      const message = {
        id,
        role: 'system' as const,
        content: `[User has highlighted dates between between ${format(
          new Date(xToDate(startHighlight)),
          'd LLL'
        )} and ${format(new Date(xToDate(endHighlight)), 'd LLL, yyyy')}`
      }

      if (aiState.messages[aiState.messages.length - 1]?.id === id) {
        setAIState({
          ...aiState,
          messages: [...aiState.messages.slice(0, -1), message]
        })
      } else {
        setAIState({
          ...aiState,
          messages: [...aiState.messages, message]
        })
      }
    }
  }, [startHighlight, endHighlight])

  return (
    <div className="rounded-xl border bg-zinc-950 p-4 text-green-400">
      <div className="float-right inline-block rounded-full bg-white/10 px-2 py-1 text-xs">
        {`${delta > 0 ? '+' : ''}${((delta / price) * 100).toFixed(2)}% ${
          delta > 0 ? '↑' : '↓'
        }`}
      </div>
      <div className="text-lg text-zinc-300">{symbol}</div>
      <div className="text-3xl font-bold">${price}</div>
      <div className="text mt-1 text-xs text-zinc-500">
        Closed: Feb 27, 4:59 PM EST
      </div>

      <div
        className="relative -mx-4 cursor-col-resize"
        onPointerDown={event => {
          if (chartRef.current) {
            const { clientX } = event
            const { left } = chartRef.current.getBoundingClientRect()

            setStartHighlight(clientX - left)
            setEndHighlight(0)

            setPriceAtTime({
              time: format(new Date(xToDate(clientX)), 'dd LLL yy'),
              value: xToValue(clientX).toFixed(2),
              x: clientX - left
            })
          }
        }}
        onPointerUp={event => {
          if (chartRef.current) {
            const { clientX } = event
            const { left } = chartRef.current.getBoundingClientRect()

            setEndHighlight(clientX - left)
          }
        }}
        onPointerMove={event => {
          if (chartRef.current) {
            const { clientX } = event
            const { left } = chartRef.current.getBoundingClientRect()

            setPriceAtTime({
              time: format(new Date(xToDate(clientX)), 'dd LLL yy'),
              value: xToValue(clientX).toFixed(2),
              x: clientX - left
            })
          }
        }}
        onPointerLeave={() => {
          setPriceAtTime({
            time: '00:00',
            value: price.toFixed(2),
            x: 0
          })
        }}
        ref={chartRef}
      >
        {priceAtTime.x > 0 ? (
          <div
            className="pointer-events-none absolute z-10 flex w-fit select-none gap-2 rounded-md bg-zinc-800 p-2"
            style={{
              left: priceAtTime.x - 124 / 2,
              top: 30
            }}
          >
            <div className="text-xs tabular-nums">${priceAtTime.value}</div>
            <div className="text-xs tabular-nums text-zinc-400">
              {priceAtTime.time}
            </div>
          </div>
        ) : null}

        {startHighlight ? (
          <div
            className="pointer-events-none absolute h-32 w-5 select-none rounded-md border border-zinc-500 bg-zinc-500/20"
            style={{
              left: startHighlight,
              width: endHighlight
                ? endHighlight - startHighlight
                : priceAtTime.x - startHighlight,
              bottom: 0
            }}
          ></div>
        ) : null}

        <svg
          viewBox="0 0 250.0 168.0"
          height="150"
          width="100%"
          preserveAspectRatio="none"
        >
          <defs>
            <linearGradient
              id="fill-id-tsuid_31"
              x1="0%"
              x2="0%"
              y1="0%"
              y2="100%"
            >
              <stop offset="0%" stopColor="#34a853" stopOpacity="0.38"></stop>
              <stop offset="13%" stopColor="#e6f4ea" stopOpacity="0"></stop>
            </linearGradient>
            <clipPath id="range-id-tsuid_31">
              <rect height="100%" width="0" x="0" y="0"></rect>
            </clipPath>
            <defs>
              <linearGradient
                id="chart-grad-_f1bJZYLUHqWpxc8Prs2meA_33"
                x1="0%"
                x2="0%"
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                y2="100%"
              >
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                <stop offset="13%" stopColor="#e6f4ea" stopOpacity="0"></stop>
              </linearGradient>
            </defs>
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}