manifold/web/components/contract/prob-change-table.tsx

import clsx from 'clsx'
import { contractPath } from 'web/lib/firebase/contracts'
import { CPMMContract } from 'common/contract'
import { formatPercent } from 'common/util/format'
import { useProbChanges } from 'web/hooks/use-prob-changes'
import { linkClass, SiteLink } from '../site-link'
import { Col } from '../layout/col'
import { Row } from '../layout/row'
import { useState } from 'react'

export function ProbChangeTable(props: { userId: string | undefined }) {
  const { userId } = props

  const changes = useProbChanges(userId ?? '')
  const [expanded, setExpanded] = useState(false)

  if (!changes) {
    return null
  }

  const count = expanded ? 16 : 4

  const { positiveChanges, negativeChanges } = changes
  const filteredPositiveChanges = positiveChanges.slice(0, count / 2)
  const filteredNegativeChanges = negativeChanges.slice(0, count / 2)
  const filteredChanges = [
    ...filteredPositiveChanges,
    ...filteredNegativeChanges,
  ]

  return (
    <Col>
      <Col className="mb-4 w-full divide-x-2 divide-y rounded-lg bg-white shadow-md md:flex-row md:divide-y-0">
        <Col className="flex-1 divide-y">
          {filteredChanges.slice(0, count / 2).map((contract) => (
            <Row className="items-center hover:bg-gray-100">
              <ProbChange
                className="p-4 text-right text-xl"
                contract={contract}
              />
              <SiteLink
                className="p-4 pl-2 font-semibold text-indigo-700"
                href={contractPath(contract)}
              >
                <span className="line-clamp-2">{contract.question}</span>
              </SiteLink>
            </Row>
          ))}
        </Col>
        <Col className="flex-1 divide-y">
          {filteredChanges.slice(count / 2).map((contract) => (
            <Row className="items-center hover:bg-gray-100">
              <ProbChange
                className="p-4 text-right text-xl"
                contract={contract}
              />
              <SiteLink
                className="p-4 pl-2 font-semibold text-indigo-700"
                href={contractPath(contract)}
              >
                <span className="line-clamp-2">{contract.question}</span>
              </SiteLink>
            </Row>
          ))}
        </Col>
      </Col>
      <div
        className={clsx(linkClass, 'cursor-pointer self-end')}
        onClick={() => setExpanded(!expanded)}
      >
        {expanded ? 'Show less' : 'Show more'}
      </div>
    </Col>
  )
}

export function ProbChange(props: {
  contract: CPMMContract
  className?: string
}) {
  const { contract, className } = props
  const {
    probChanges: { day: change },
  } = contract

  const color =
    change > 0
      ? 'text-green-500'
      : change < 0
      ? 'text-red-500'
      : 'text-gray-600'

  const str =
    change === 0
      ? '+0%'
      : `${change > 0 ? '+' : '-'}${formatPercent(Math.abs(change))}`
  return <div className={clsx(className, color)}>{str}</div>
}