import _ from 'lodash'
import Link from 'next/link'

import { Fold } from '../../../../common/fold'
import { Comment } from '../../../../common/comment'
import { Page } from '../../../components/page'
import { Title } from '../../../components/title'
import { Bet, listAllBets } from '../../../lib/firebase/bets'
import { listAllComments } from '../../../lib/firebase/comments'
import { Contract } from '../../../lib/firebase/contracts'
import {
  foldPath,
  getFoldBySlug,
  getFoldContracts,
} from '../../../lib/firebase/folds'
import { ActivityFeed, findActiveContracts } from '../../activity'
import { TagsList } from '../../../components/tags-list'
import { Row } from '../../../components/layout/row'
import { UserLink } from '../../../components/user-page'
import { getUser, User } from '../../../lib/firebase/users'
import { Spacer } from '../../../components/layout/spacer'
import { Col } from '../../../components/layout/col'
import { useUser } from '../../../hooks/use-user'
import { useFold } from '../../../hooks/use-fold'
import { SearchableGrid } from '../../../components/contracts-list'
import { useQueryAndSortParams } from '../../../hooks/use-sort-and-query-params'
import { useRouter } from 'next/router'
import clsx from 'clsx'
import { scoreCreators, scoreTraders } from '../../../lib/firebase/scoring'
import { Leaderboard } from '../../../components/leaderboard'
import { formatMoney, toCamelCase } from '../../../../common/util/format'
import { EditFoldButton } from '../../../components/edit-fold-button'
import Custom404 from '../../404'
import { FollowFoldButton } from '../../../components/follow-fold-button'
import FeedCreate from '../../../components/feed-create'
import { SEO } from '../../../components/SEO'
import { useTaggedContracts } from '../../../hooks/use-contracts'

export async function getStaticProps(props: { params: { slugs: string[] } }) {
  const { slugs } = props.params

  const fold = await getFoldBySlug(slugs[0])
  const curatorPromise = fold ? getUser(fold.curatorId) : null

  const contracts = fold ? await getFoldContracts(fold).catch((_) => []) : []
  const contractComments = await Promise.all(
    contracts.map((contract) => listAllComments(contract.id).catch((_) => []))
  )

  let activeContracts = findActiveContracts(
    contracts,
    _.flatten(contractComments),
    365
  )
  const [resolved, unresolved] = _.partition(
    activeContracts,
    ({ isResolved }) => isResolved
  )
  activeContracts = [...unresolved, ...resolved]

  const activeContractBets = await Promise.all(
    activeContracts.map((contract) => listAllBets(contract.id).catch((_) => []))
  )
  const activeContractComments = activeContracts.map(
    (contract) =>
      contractComments[contracts.findIndex((c) => c.id === contract.id)]
  )

  const curator = await curatorPromise

  const bets = await Promise.all(
    contracts.map((contract) => listAllBets(contract.id))
  )

  const creatorScores = scoreCreators(contracts, bets)
  const [topCreators, topCreatorScores] = await toUserScores(creatorScores)

  const traderScores = scoreTraders(contracts, bets)
  const [topTraders, topTraderScores] = await toUserScores(traderScores)

  return {
    props: {
      fold,
      curator,
      contracts,
      activeContracts,
      activeContractBets,
      activeContractComments,
      topTraders,
      topTraderScores,
      topCreators,
      topCreatorScores,
    },

    revalidate: 60, // regenerate after a minute
  }
}

async function toUserScores(userScores: { [userId: string]: number }) {
  const topUserPairs = _.take(
    _.sortBy(Object.entries(userScores), ([_, score]) => -1 * score),
    10
  ).filter(([_, score]) => score > 0)

  const topUsers = await Promise.all(
    topUserPairs.map(([userId]) => getUser(userId))
  )
  const existingPairs = topUserPairs.filter(([id, _]) =>
    topUsers.find((user) => user?.id === id)
  )
  const topExistingUsers = existingPairs.map(
    ([id]) => topUsers.find((user) => user?.id === id) as User
  )
  const topUserScores = existingPairs.map(([_, score]) => score)
  return [topExistingUsers, topUserScores] as const
}

export async function getStaticPaths() {
  return { paths: [], fallback: 'blocking' }
}
const foldSubpages = [undefined, 'activity', 'markets', 'leaderboards'] as const

export default function FoldPage(props: {
  fold: Fold | null
  curator: User
  contracts: Contract[]
  activeContracts: Contract[]
  activeContractBets: Bet[][]
  activeContractComments: Comment[][]
  topTraders: User[]
  topTraderScores: number[]
  topCreators: User[]
  topCreatorScores: number[]
}) {
  const {
    curator,
    activeContractBets,
    activeContractComments,
    topTraders,
    topTraderScores,
    topCreators,
    topCreatorScores,
  } = props

  const router = useRouter()
  const { slugs } = router.query as { slugs: string[] }

  const page = (slugs[1] ?? 'activity') as typeof foldSubpages[number]

  const fold = useFold(props.fold?.id) ?? props.fold

  const { query, setQuery, sort, setSort } = useQueryAndSortParams({
    defaultSort: 'most-traded',
  })

  const user = useUser()
  const isCurator = user && fold && user.id === fold.curatorId

  const taggedContracts = useTaggedContracts(fold?.tags) ?? props.contracts
  const contractsMap = _.fromPairs(
    taggedContracts.map((contract) => [contract.id, contract])
  )

  const contracts = props.contracts.map((contract) => contractsMap[contract.id])
  const activeContracts = props.activeContracts.map(
    (contract) => contractsMap[contract.id]
  )

  if (fold === null || !foldSubpages.includes(page) || slugs[2]) {
    return <Custom404 />
  }

  return (
    <Page wide>
      <SEO
        title={fold.name}
        description={`Curated by ${curator.name}. ${fold.about}`}
        url={foldPath(fold)}
      />

      <div className="px-3 lg:px-1">
        <Row className="justify-between mb-6">
          <Title className="!m-0" text={fold.name} />
          {isCurator ? (
            <EditFoldButton className="ml-1" fold={fold} />
          ) : (
            <FollowFoldButton className="ml-1" fold={fold} />
          )}
        </Row>

        <Col className="md:hidden text-gray-500 gap-2 mb-6">
          <Row>
            <div className="mr-1">Curated by</div>
            <UserLink
              className="text-neutral"
              name={curator.name}
              username={curator.username}
            />
          </Row>
          <div>{fold.about}</div>
        </Col>
      </div>

      <div className="tabs mb-2">
        <Link href={foldPath(fold)} shallow>
          <a
            className={clsx(
              'tab tab-bordered',
              page === 'activity' && 'tab-active'
            )}
          >
            Activity
          </a>
        </Link>

        <Link href={foldPath(fold, 'markets')} shallow>
          <a
            className={clsx(
              'tab tab-bordered',
              page === 'markets' && 'tab-active'
            )}
          >
            Markets
          </a>
        </Link>
        <Link href={foldPath(fold, 'leaderboards')} shallow>
          <a
            className={clsx(
              'tab tab-bordered',
              page === 'leaderboards' && 'tab-active',
              page !== 'leaderboards' && 'md:hidden'
            )}
          >
            Leaderboards
          </a>
        </Link>
      </div>

      {(page === 'activity' || page === 'markets') && (
        <Row className={clsx(page === 'activity' ? 'gap-16' : 'gap-8')}>
          <Col className="flex-1">
            {user !== null && (
              <FeedCreate
                className={clsx(page !== 'activity' && 'hidden')}
                user={user}
                tag={toCamelCase(fold.name)}
                placeholder={`Type your question about ${fold.name}`}
              />
            )}
            {page === 'activity' ? (
              <>
                <ActivityFeed
                  contracts={activeContracts}
                  contractBets={activeContractBets}
                  contractComments={activeContractComments}
                />
                {activeContracts.length === 0 && (
                  <div className="text-gray-500 mt-4 mx-2 lg:mx-0">
                    No activity from matching markets.{' '}
                    {isCurator && 'Try editing to add more tags!'}
                  </div>
                )}
              </>
            ) : (
              <SearchableGrid
                contracts={contracts}
                query={query}
                setQuery={setQuery}
                sort={sort}
                setSort={setSort}
              />
            )}
          </Col>
          <Col className="hidden md:flex max-w-xs w-full gap-10">
            <FoldOverview fold={fold} curator={curator} />
            <FoldLeaderboards
              topTraders={topTraders}
              topTraderScores={topTraderScores}
              topCreators={topCreators}
              topCreatorScores={topCreatorScores}
            />
          </Col>
        </Row>
      )}

      {page === 'leaderboards' && (
        <Col className="gap-8 lg:flex-row">
          <FoldLeaderboards
            topTraders={topTraders}
            topTraderScores={topTraderScores}
            topCreators={topCreators}
            topCreatorScores={topCreatorScores}
          />
        </Col>
      )}
    </Page>
  )
}

function FoldOverview(props: { fold: Fold; curator: User }) {
  const { fold, curator } = props
  const { about, tags } = fold

  return (
    <Col>
      <div className="px-4 py-3 bg-indigo-500 text-white text-sm rounded-t">
        About community
      </div>
      <Col className="p-4 bg-white gap-2 rounded-b">
        <Row>
          <div className="text-gray-500 mr-1">Curated by</div>
          <UserLink
            className="text-neutral"
            name={curator.name}
            username={curator.username}
          />
        </Row>

        {about && (
          <>
            <Spacer h={2} />
            <div className="text-gray-500">{about}</div>
          </>
        )}

        <Spacer h={2} />

        <TagsList tags={tags.map((tag) => `#${tag}`)} />
      </Col>
    </Col>
  )
}

function FoldLeaderboards(props: {
  topTraders: User[]
  topTraderScores: number[]
  topCreators: User[]
  topCreatorScores: number[]
}) {
  const { topTraders, topTraderScores, topCreators, topCreatorScores } = props
  return (
    <>
      <Leaderboard
        className="max-w-xl"
        title="🏅 Top traders"
        users={topTraders}
        columns={[
          {
            header: 'Profit',
            renderCell: (user) =>
              formatMoney(topTraderScores[topTraders.indexOf(user)]),
          },
        ]}
      />
      <Leaderboard
        className="max-w-xl"
        title="🏅 Top creators"
        users={topCreators}
        columns={[
          {
            header: 'Market pool',
            renderCell: (user) =>
              formatMoney(topCreatorScores[topCreators.indexOf(user)]),
          },
        ]}
      />
    </>
  )
}