import {
  collection,
  deleteDoc,
  doc,
  getDoc,
  getDocs,
  limit,
  orderBy,
  Query,
  query,
  setDoc,
  startAfter,
  updateDoc,
  where,
} from 'firebase/firestore'
import { partition, sortBy, sum, uniqBy } from 'lodash'

import { coll, getValues, listenForValue, listenForValues } from './utils'
import { BinaryContract, Contract } from 'common/contract'
import { chooseRandomSubset } from 'common/util/random'
import { formatMoney, formatPercent } from 'common/util/format'
import { DAY_MS } from 'common/util/time'
import { Bet } from 'common/bet'
import { Comment } from 'common/comment'
import { ENV_CONFIG } from 'common/envs/constants'
import { getBinaryProb } from 'common/contract-details'

export const contracts = coll<Contract>('contracts')

export type { Contract }

export function contractPath(contract: Contract) {
  return `/${contract.creatorUsername}/${contract.slug}`
}

export function contractPathWithoutContract(
  creatorUsername: string,
  slug: string
) {
  return `/${creatorUsername}/${slug}`
}

export function homeContractPath(contract: Contract) {
  return `/home?c=${contract.slug}`
}

export function contractUrl(contract: Contract) {
  return `https://${ENV_CONFIG.domain}${contractPath(contract)}`
}

export function contractPool(contract: Contract) {
  return contract.mechanism === 'cpmm-1'
    ? formatMoney(contract.totalLiquidity)
    : contract.mechanism === 'dpm-2'
    ? formatMoney(sum(Object.values(contract.pool)))
    : 'Empty pool'
}

export function getBinaryProbPercent(contract: BinaryContract) {
  return formatPercent(getBinaryProb(contract))
}

export function tradingAllowed(contract: Contract) {
  return (
    !contract.isResolved &&
    (!contract.closeTime || contract.closeTime > Date.now())
  )
}

// Push contract to Firestore
export async function setContract(contract: Contract) {
  await setDoc(doc(contracts, contract.id), contract)
}

export async function updateContract(
  contractId: string,
  update: Partial<Contract>
) {
  await updateDoc(doc(contracts, contractId), update)
}

export async function getContractFromId(contractId: string) {
  const result = await getDoc(doc(contracts, contractId))
  return result.exists() ? result.data() : undefined
}

export async function getContractFromSlug(slug: string) {
  const q = query(contracts, where('slug', '==', slug))
  const snapshot = await getDocs(q)
  return snapshot.empty ? undefined : snapshot.docs[0].data()
}

export async function deleteContract(contractId: string) {
  await deleteDoc(doc(contracts, contractId))
}

export async function listContracts(creatorId: string): Promise<Contract[]> {
  const q = query(
    contracts,
    where('creatorId', '==', creatorId),
    orderBy('createdTime', 'desc')
  )
  const snapshot = await getDocs(q)
  return snapshot.docs.map((doc) => doc.data())
}

export const tournamentContractsByGroupSlugQuery = (slug: string) =>
  query(
    contracts,
    where('groupSlugs', 'array-contains', slug),
    orderBy('popularityScore', 'desc')
  )

export async function listContractsByGroupSlug(
  slug: string
): Promise<Contract[]> {
  const q = query(contracts, where('groupSlugs', 'array-contains', slug))
  const snapshot = await getDocs(q)
  return snapshot.docs.map((doc) => doc.data())
}

export async function listTaggedContractsCaseInsensitive(
  tag: string
): Promise<Contract[]> {
  const q = query(
    contracts,
    where('lowercaseTags', 'array-contains', tag.toLowerCase()),
    orderBy('createdTime', 'desc')
  )
  const snapshot = await getDocs(q)
  return snapshot.docs.map((doc) => doc.data())
}

export async function listAllContracts(
  n: number,
  before?: string,
  sortDescBy = 'createdTime'
): Promise<Contract[]> {
  let q = query(contracts, orderBy(sortDescBy, 'desc'), limit(n))
  if (before != null) {
    const snap = await getDoc(doc(contracts, before))
    q = query(q, startAfter(snap))
  }
  const snapshot = await getDocs(q)
  return snapshot.docs.map((doc) => doc.data())
}

export function listenForContracts(
  setContracts: (contracts: Contract[]) => void
) {
  const q = query(contracts, orderBy('createdTime', 'desc'))
  return listenForValues<Contract>(q, setContracts)
}

export function listenForUserContracts(
  creatorId: string,
  setContracts: (contracts: Contract[]) => void
) {
  const q = query(
    contracts,
    where('creatorId', '==', creatorId),
    orderBy('createdTime', 'desc')
  )
  return listenForValues<Contract>(q, setContracts)
}

export function getUserBetContracts(userId: string) {
  return getValues<Contract>(getUserBetContractsQuery(userId))
}

export const MAX_USER_BET_CONTRACTS_LOADED = 1000
export function getUserBetContractsQuery(userId: string) {
  return query(
    contracts,
    where('uniqueBettorIds', 'array-contains', userId),
    limit(MAX_USER_BET_CONTRACTS_LOADED)
  ) as Query<Contract>
}

const inactiveContractsQuery = query(
  contracts,
  where('isResolved', '==', false),
  where('closeTime', '>', Date.now()),
  where('visibility', '==', 'public'),
  where('volume24Hours', '==', 0)
)

export function getInactiveContracts() {
  return getValues<Contract>(inactiveContractsQuery)
}

export function listenForInactiveContracts(
  setContracts: (contracts: Contract[]) => void
) {
  return listenForValues<Contract>(inactiveContractsQuery, setContracts)
}

const newContractsQuery = query(
  contracts,
  where('isResolved', '==', false),
  where('volume7Days', '==', 0),
  where('createdTime', '>', Date.now() - 7 * DAY_MS)
)

export function listenForNewContracts(
  setContracts: (contracts: Contract[]) => void
) {
  return listenForValues<Contract>(newContractsQuery, setContracts)
}

export function listenForContract(
  contractId: string,
  setContract: (contract: Contract | null) => void
) {
  const contractRef = doc(contracts, contractId)
  return listenForValue<Contract>(contractRef, setContract)
}

export function listenForContractFollows(
  contractId: string,
  setFollowIds: (followIds: string[]) => void
) {
  const follows = collection(contracts, contractId, 'follows')
  return listenForValues<{ id: string }>(follows, (docs) =>
    setFollowIds(docs.map(({ id }) => id))
  )
}

export async function followContract(contractId: string, userId: string) {
  const followDoc = doc(collection(contracts, contractId, 'follows'), userId)
  return await setDoc(followDoc, {
    id: userId,
    createdTime: Date.now(),
  })
}

export async function unFollowContract(contractId: string, userId: string) {
  const followDoc = doc(collection(contracts, contractId, 'follows'), userId)
  await deleteDoc(followDoc)
}

const hotContractsQuery = query(
  contracts,
  where('isResolved', '==', false),
  where('visibility', '==', 'public'),
  orderBy('volume24Hours', 'desc'),
  limit(16)
)

export function listenForHotContracts(
  setHotContracts: (contracts: Contract[]) => void
) {
  return listenForValues<Contract>(hotContractsQuery, (contracts) => {
    const hotContracts = sortBy(
      chooseRandomSubset(contracts, 4),
      (contract) => contract.volume24Hours
    )
    setHotContracts(hotContracts)
  })
}

export const trendingContractsQuery = query(
  contracts,
  where('isResolved', '==', false),
  where('visibility', '==', 'public'),
  orderBy('popularityScore', 'desc')
)

export async function getTrendingContracts(maxContracts = 10) {
  return await getValues<Contract>(
    query(trendingContractsQuery, limit(maxContracts))
  )
}

export async function getContractsBySlugs(slugs: string[]) {
  const q = query(contracts, where('slug', 'in', slugs))
  const snapshot = await getDocs(q)
  const data = snapshot.docs.map((doc) => doc.data())
  return sortBy(data, (contract) => -1 * contract.volume24Hours)
}

const closingSoonQuery = query(
  contracts,
  where('isResolved', '==', false),
  where('visibility', '==', 'public'),
  where('closeTime', '>', Date.now()),
  orderBy('closeTime', 'asc'),
  limit(6)
)

export async function getClosingSoonContracts() {
  const data = await getValues<Contract>(closingSoonQuery)
  return sortBy(chooseRandomSubset(data, 2), (contract) => contract.closeTime)
}

export const getTopCreatorContracts = async (
  creatorId: string,
  count: number
) => {
  const creatorContractsQuery = query(
    contracts,
    where('isResolved', '==', false),
    where('creatorId', '==', creatorId),
    orderBy('popularityScore', 'desc'),
    limit(count)
  )
  return await getValues<Contract>(creatorContractsQuery)
}

export const getTopGroupContracts = async (
  groupSlug: string,
  count: number
) => {
  const creatorContractsQuery = query(
    contracts,
    where('groupSlugs', 'array-contains', groupSlug),
    where('isResolved', '==', false),
    orderBy('popularityScore', 'desc'),
    limit(count)
  )
  return await getValues<Contract>(creatorContractsQuery)
}

export const getRecommendedContracts = async (
  contract: Contract,
  excludeBettorId: string,
  count: number
) => {
  const { creatorId, groupSlugs, id } = contract

  const [userContracts, groupContracts] = await Promise.all([
    getTopCreatorContracts(creatorId, count * 2),
    groupSlugs && groupSlugs[0]
      ? getTopGroupContracts(groupSlugs[0], count * 2)
      : [],
  ])

  const combined = uniqBy([...userContracts, ...groupContracts], (c) => c.id)

  const open = combined
    .filter((c) => c.closeTime && c.closeTime > Date.now())
    .filter((c) => c.id !== id)

  const [betOnContracts, nonBetOnContracts] = partition(
    open,
    (c) => c.uniqueBettorIds && c.uniqueBettorIds.includes(excludeBettorId)
  )
  const chosen = chooseRandomSubset(nonBetOnContracts, count)
  if (chosen.length < count)
    chosen.push(...chooseRandomSubset(betOnContracts, count - chosen.length))

  return chosen
}

export async function getRecentBetsAndComments(contract: Contract) {
  const contractDoc = doc(contracts, contract.id)

  const [recentBets, recentComments] = await Promise.all([
    getValues<Bet>(
      query(
        collection(contractDoc, 'bets'),
        where('createdTime', '>', Date.now() - DAY_MS),
        orderBy('createdTime', 'desc'),
        limit(1)
      )
    ),

    getValues<Comment>(
      query(
        collection(contractDoc, 'comments'),
        where('createdTime', '>', Date.now() - 3 * DAY_MS),
        orderBy('createdTime', 'desc'),
        limit(3)
      )
    ),
  ])

  return {
    contract,
    recentBets,
    recentComments,
  }
}