manifold/web/components/bet-panel.tsx

import clsx from 'clsx'
import React, { useState } from 'react'
import { useUser } from '../hooks/use-user'
import { Bet, saveBet } from '../lib/firebase/bets'
import { Contract } from '../lib/firebase/contracts'
import { Col } from './layout/col'
import { Row } from './layout/row'
import { Spacer } from './layout/spacer'
import { YesNoSelector } from './yes-no-selector'

export function BetPanel(props: { contract: Contract; className?: string }) {
  const { contract, className } = props

  const user = useUser()

  const [betChoice, setBetChoice] = useState<'YES' | 'NO'>('YES')
  const [betAmount, setBetAmount] = useState<number | undefined>(undefined)

  const [isSubmitting, setIsSubmitting] = useState(false)
  const [wasSubmitted, setWasSubmitted] = useState(false)

  function onBetChange(str: string) {
    const amount = parseInt(str)
    setBetAmount(isNaN(amount) ? undefined : amount)
  }

  async function submitBet() {
    if (!user || !betAmount) return

    const now = Date.now()

    const bet: Bet = {
      id: `${now}-${user.id}`,
      userId: user.id,
      contractId: contract.id,
      createdTime: now,
      outcome: betChoice,
      amount: betAmount,

      // Placeholder.
      dpmWeight: betAmount,
    }

    setIsSubmitting(true)

    await saveBet(bet)

    setIsSubmitting(false)
    setWasSubmitted(true)
  }

  function newBet() {
    setBetAmount(undefined)
    setWasSubmitted(false)
  }

  const betDisabled = isSubmitting || wasSubmitted

  return (
    <Col className={clsx('bg-gray-600 p-6 rounded w-full md:w-auto', className)}>
      <div className="p-2 font-medium">Pick outcome</div>
      <YesNoSelector
        className="p-2"
        selected={betChoice}
        onSelect={setBetChoice}
        yesLabel="Yes 57"
        noLabel="No 43"
      />

      <Spacer h={4} />

      <div className="p-2 font-medium">Bet amount</div>
      <Row className="p-2 items-center">
        <input
          className="input input-bordered input-md"
          style={{ maxWidth: 80 }}
          type="text"
          placeholder="0"
          value={betAmount ?? ''}
          onChange={(e) => onBetChange(e.target.value)}
        />
        <div className="ml-3">points</div>
      </Row>

      {!!betAmount && (
        <>
          <Spacer h={4} />

          <div className="p-2 font-medium">Average price</div>
          <div className="px-2">{betChoice === 'YES' ? 0.57 : 0.43} points</div>

          <Spacer h={2} />

          <div className="p-2 font-medium">Estimated winnings</div>
          <div className="px-2">
            {Math.floor(betAmount / (betChoice === 'YES' ? 0.57 : 0.43))} points
          </div>

          <Spacer h={6} />

          <button
            className={clsx(
              'btn',
              betDisabled ? 'btn-disabled' : 'btn-primary'
            )}
            onClick={betDisabled ? undefined : submitBet}
          >
            Place bet
          </button>

          {wasSubmitted && (
            <Col>
              <Spacer h={4} />

              <div>Bet submitted!</div>

              <Spacer h={4} />

              <button className="btn btn-primary btn-xs" onClick={newBet}>
                New bet
              </button>
            </Col>
          )}
        </>
      )}
    </Col>
  )
}