manifold/web/pages/create.tsx

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import router from 'next/router'
import { useEffect, useState } from 'react'
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import { CreatorContractsList } from '../components/contracts-list'
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import { Spacer } from '../components/layout/spacer'
import { Title } from '../components/title'
import { useUser } from '../hooks/use-user'
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import { path } from '../lib/firebase/contracts'
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import { createContract } from '../lib/service/create-contract'
import { Page } from '../components/page'
import clsx from 'clsx'
import dayjs from 'dayjs'
// Allow user to create a new contract
export default function NewContract() {
const creator = useUser()
useEffect(() => {
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if (creator === null) router.push('/')
})
const [initialProb, setInitialProb] = useState(50)
const [question, setQuestion] = useState('')
const [description, setDescription] = useState('')
const [closeDate, setCloseDate] = useState('')
const [isSubmitting, setIsSubmitting] = useState(false)
const [collapsed, setCollapsed] = useState(true)
// Given a date string like '2022-04-02',
// return the time just before midnight on that date (in the user's local time), as millis since epoch
function dateToMillis(date: string) {
return dayjs(date)
.set('hour', 23)
.set('minute', 59)
.set('second', 59)
.valueOf()
}
const closeTime = dateToMillis(closeDate)
// We'd like this to look like "Apr 2, 2022, 23:59:59 PM PT" but timezones are hard with dayjs
const formattedCloseTime = new Date(closeTime).toString()
const isValid =
initialProb > 0 &&
initialProb < 100 &&
question.length > 0 &&
// If set, closeTime must be in the future
(!closeDate || closeTime > Date.now())
async function submit() {
// TODO: Tell users why their contract is invalid
if (!creator || !isValid) return
setIsSubmitting(true)
const contract = await createContract(
question,
description,
initialProb,
creator,
closeTime
)
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await router.push(path(contract))
}
const descriptionPlaceholder = `e.g. This market will resolve to “Yes” if, by June 2, 2021, 11:59:59 PM ET, Paxlovid (also known under PF-07321332)...`
if (!creator) return <></>
return (
<Page>
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<Title text="Create a new prediction market" />
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<div className="w-full bg-white rounded-lg shadow-md px-6 py-4">
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{/* Create a Tailwind form that takes in all the fields needed for a new contract */}
{/* When the form is submitted, create a new contract in the database */}
<form>
<div className="form-control w-full">
<label className="label">
<span className="label-text">Prediction</span>
</label>
<input
type="text"
placeholder="e.g. The FDA will approve Paxlovid before Jun 2nd, 2022"
className="input input-bordered"
value={question}
onChange={(e) => setQuestion(e.target.value || '')}
/>
</div>
<Spacer h={4} />
<div className="form-control">
<label className="label">
<span className="label-text">Initial probability</span>
</label>
<label className="input-group input-group-md w-fit">
<input
type="number"
value={initialProb}
className="input input-bordered input-md"
min={1}
max={99}
onChange={(e) => setInitialProb(parseInt(e.target.value))}
/>
<span>%</span>
</label>
</div>
<Spacer h={4} />
<div className="form-control">
<label className="label">
<span className="label-text">Description (optional)</span>
</label>
<textarea
className="textarea w-full h-24 textarea-bordered"
placeholder={descriptionPlaceholder}
value={description}
onClick={(e) => e.stopPropagation()}
onChange={(e) => setDescription(e.target.value || '')}
/>
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</div>
{/* Collapsible "Advanced" section */}
<div
tabIndex={0}
className={clsx(
'cursor-pointer relative collapse collapse-arrow',
collapsed ? 'collapse-close' : 'collapse-open'
)}
>
<div onClick={() => setCollapsed((collapsed) => !collapsed)}>
<div className="mt-4 mr-6 text-sm text-gray-400 text-right">
Advanced
</div>
<div
className="collapse-title p-0 absolute w-0 h-0 min-h-0"
style={{
top: -2,
right: -15,
color: '#9ca3af' /* gray-400 */,
}}
/>
</div>
<div className="collapse-content !p-0 m-0 !bg-transparent">
<div className="form-control">
<label className="label">
<span className="label-text">Close date (optional)</span>
</label>
<input
type="date"
className="input input-bordered"
onClick={(e) => e.stopPropagation()}
onChange={(e) => setCloseDate(e.target.value || '')}
min={new Date().toISOString().split('T')[0]}
value={closeDate}
/>
</div>
<label>
{closeDate && (
<span className="label-text text-gray-400 ml-1">
No new trades will be allowed after {formattedCloseTime}
</span>
)}
</label>
</div>
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</div>
<Spacer h={4} />
<div className="flex justify-end my-4">
<button
type="submit"
className="btn btn-primary"
disabled={isSubmitting || !isValid}
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onClick={(e) => {
e.preventDefault()
submit()
}}
>
Create market
</button>
</div>
</form>
</div>
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<Spacer h={10} />
<Title text="Your markets" />
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{creator && <CreatorContractsList creator={creator} />}
</Page>
)
}