manifold/web/components/feed-create.tsx

import { AvatarPlaceholder, AvatarWithIcon } from './contract-feed'
import { Title } from './title'
import Textarea from 'react-expanding-textarea'
import { useState } from 'react'
import { Spacer } from './layout/spacer'
import { NewContract } from '../pages/create'
import { firebaseLogin, User } from '../lib/firebase/users'
import { ContractsGrid } from './contracts-list'
import { Contract } from '../../common/contract'
import { TagsList } from './tags-list'
import { Col } from './layout/col'

export function FeedPromo(props: { hotContracts: Contract[] }) {
  const { hotContracts } = props

  return (
    <>
      <Col className="w-full bg-white p-6 sm:rounded-lg shadow-md">
        <h1 className="mt-4 text-4xl sm:mt-5 sm:text-6xl lg:mt-6 xl:text-6xl">
          <div className="mb-2">Create your own</div>
          <div className="font-bold bg-clip-text text-transparent bg-gradient-to-r  from-teal-400 to-green-400">
            prediction markets
          </div>
        </h1>
        <Spacer h={6} />
        <div className="text-gray-500 mb-4">
          Find prediction markets run by your favorite creators, or make your
          own.
          <br />
          Sign up to get M$ 1,000 for free and start trading!
          <br />
        </div>
        <Spacer h={6} />
        <button
          className="btn btn-lg self-center border-none bg-gradient-to-r from-teal-500 to-green-500 hover:from-teal-600 hover:to-green-600"
          onClick={firebaseLogin}
        >
          Sign up now
        </button>{' '}
      </Col>

      <Spacer h={6} />

      <TagsList
        className="mt-2"
        tags={['#politics', '#crypto', '#covid', '#sports', '#meta']}
      />
      <Spacer h={6} />
      <ContractsGrid
        contracts={hotContracts?.slice(0, 10) || []}
        showHotVolume
      />
    </>
  )
}

export default function FeedCreate(props: { user?: User }) {
  const { user } = props
  const [question, setQuestion] = useState('')

  const placeholders = [
    'Will I make a new friend this week?',
    'Will we discover that the world is a simulation?',
    'Will anyone I know get engaged this year?',
    'Will humans set foot on Mars by the end of 2030?',
    'If I switch jobs, will I have more free time in 6 months than I do now?',
    'Will any cryptocurrency eclipse Bitcoin by market cap?',
  ]
  // Rotate through a new placeholder each day
  // Easter egg idea: click your own name to shuffle the placeholder
  const daysSinceEpoch = Math.floor(Date.now() / 1000 / 60 / 60 / 24)
  const placeholder = placeholders[daysSinceEpoch % placeholders.length]

  return (
    <div className="w-full bg-indigo-50 sm:rounded-md p-4">
      <div className="relative flex items-start space-x-3">
        {user?.avatarUrl ? (
          <AvatarWithIcon username={user.username} avatarUrl={user.avatarUrl} />
        ) : (
          <AvatarPlaceholder />
        )}

        <div className="min-w-0 flex-1">
          {/* TODO: Show focus, for accessibility */}
          <div>
            <p className="my-0.5 text-sm">Ask a question... </p>
          </div>
          <Textarea
            className="text-lg sm:text-xl text-indigo-700 w-full border-transparent focus:border-transparent bg-transparent p-0 appearance-none resize-none focus:ring-transparent placeholder:text-gray-400"
            placeholder={`e.g. ${placeholder}`}
            value={question}
            onClick={(e) => e.stopPropagation()}
            onChange={(e) => setQuestion(e.target.value || '')}
          />
          <Spacer h={4} />
        </div>
      </div>

      {/* Hide component instead of deleting, so edits to NewContract don't get lost */}
      <div className={question ? '' : 'hidden'}>
        <NewContract question={question} />
      </div>

      {/* Show a fake "Create Market" button, which gets replaced with the NewContract one*/}
      {!question && (
        <div className="flex justify-end">
          <button className="btn" disabled>
            Create Market
          </button>
        </div>
      )}
    </div>
  )
}