import { Op } from 'sequelize'
import { ApiPromise } from '@polkadot/api'

// models
import {
  Account,
  Balance,
  Block,
  Category,
  Channel,
  Council,
  Consul,
  Commitment,
  Era,
  Event,
  Member,
  Post,
  Proposal,
  ProposalPost,
  ProposalVote,
  Thread,
  Moderation,
} from '../db/models'

// library
import {
  getBlockHash,
  getHead,
  getTimestamp,
  getEra,
  getEraStake,
  getEvents,
  getCouncil,
  getCouncils,
  getCouncilRound,
  getCouncilElectionStatus,
  getCouncilElectionDurations,
  getCommitment,
  getCommitments,
  getProposalCount,
  getProposal,
  getProposalVotes,
  getProposalPost,
  getProposalPosts,
  getProposalPostCount,
  getProposalThreadCount,
  getNextMember,
  getNextChannel,
  getNextCategory,
  getNextThread,
  getNextPost,
  getCategory,
  getThread,
  getPost,
  getAccount,
  getAccounts,
  getMember,
  getMemberIdByAccount,
  getValidators,
  getValidatorCount,
} from './lib/api'
//import { fetchReports } from './lib/github'
import axios from 'axios'
import moment from 'moment'
import chalk from 'chalk'

// types
import { AccountBalance, Round, Vote, ProposalDetail } from './lib/types'
import {
  AccountId,
  BlockNumber,
  Hash,
  Moment,
  ActiveEraInfo,
  EventRecord,
} from '@polkadot/types/interfaces'
import { HeaderExtended } from '@polkadot/api-derive/types'
//import { AccountInfo } from '@polkadot/types/interfaces/system'
import { SealedVote, Seat } from '@joystream/types/council'
import { MemberId, Membership } from '@joystream/types/members'
import {
  ProposalId,
  DiscussionPost,
  SpendingParams,
  VoteKind,
} from '@joystream/types/proposals'

import { Status } from '../types'
import {
  MemberType,
  CategoryType,
  ChannelType,
  CommitmentType,
  PostType,
  ThreadType,
  CouncilType,
  ModerationType,
  ProposalPostType,
} from '../types/model'

const WORKERS = 3
const DELAY = 100 // ms
let lastUpdate = 0
let queuedAll = false
let queue: any[] = []
let processing = ''
let busy = 0

const processNext = async () => {
  if (busy === WORKERS) return //console.log(`ne free worker`)
  const task = queue.shift()
  if (!task) return //console.log(`no task`)
  busy++
  if (busy < WORKERS) setTimeout(processNext, DELAY)
  const result = await task()
  busy--
  setTimeout(processNext, DELAY)
}

export const addBlock = async (
  api: ApiPromise,
  io: any,
  header: HeaderExtended,
  status: Status = {
    block: 0,
    election: {
      durations: [],
      stage: null,
      round: 0,
      stageEndsAt: 0,
      termEndsAt: 0,
    },
    era: 0,
    round: 0,
    members: 0,
    channels: 0,
    categories: 0,
    threads: 0,
    posts: 0,
    proposals: 0,
    proposalPosts: 0,
  }
): Promise<Status> => {
  const id = header.number.toNumber()
  const exists = await Block.findByPk(id)
  if (exists || !header.author) return status
  const key = header.author.toHuman()
  const block = await processBlock(api, id)
  const [account] = await Account.findOrCreate({ where: { key } })
  await block.setValidator(account.key)
  io.emit('block', await Block.findByIdWithIncludes(id))

  // log
  const member = await fetchMemberByAccount(api, header.author)
  const author = member ? member.handle : key
  console.log(`[Joystream] block ${id} ${author} [${logStatus()}]`)

  const shouldUpdate = id / 10 === Math.floor(id / 10)
  return shouldUpdate ? updateStatus(api, id) : status
}

const logStatus = () =>
  queue.length ? `${busy}/${queue.length}: ${processing}` : processing;

const processBlock = async (api: ApiPromise, id: number) => {
  const exists = await Block.findByPk(id)
  if (exists) return exists
  let [block, created] = await Block.findOrCreate({ where: { id } })
  return block
  processing = `block ${id}`
  console.log(processing)
  const hash = await getBlockHash(api, id)
  const last = await Block.findByPk(id - 1)
  const lastTimestamp: number = last?.timestamp
    ? last.timestamp
    : await getTimestamp(api, await getBlockHash(api, id - 1))
  const timestamp = await getTimestamp(api, hash)
  console.log(`timestamp`, timestamp, lastTimestamp)
  const blocktime = timestamp - lastTimestamp
  return Block.create({ id, hash: String(hash), timestamp, blocktime })
  processEvents(api, id, hash)
  importEraAtBlock(api, id, hash)
  processNext()
  return block
}

export const addBlockRange = async (
  api: ApiPromise,
  startBlock: number,
  endBlock: number
) => {
  for (let block = startBlock; block <= endBlock; block++)
    queue.push(() => processBlock(api, block))
  setInterval(() => {
    const status = logStatus()
    if (status === `[no tasks]`) process.exit()
    console.log(status)
  }, 1000)
  processNext()
}

// TODO only fetchAll() once, then respond to chain events
const updateStatus = async (
  api: ApiPromise,
  block: number
): Promise<Status> => {
  const hash = await getBlockHash(api, block)
  const status = {
    block,
    era: await getEra(api, hash),
    round: await getCouncilRound(api, hash),
    election: await getCouncilElectionStatus(api, hash),
    members: (await getNextMember(api, hash)) - 1,
    channels: (await getNextChannel(api, hash)) - 1,
    categories: (await getNextCategory(api, hash)) - 1,
    threads: (await getNextThread(api, hash)) - 1,
    posts: (await getNextPost(api, hash)) - 1,
    proposals: await getProposalCount(api, hash),
    proposalPosts: await getProposalPostCount(api),
  }
  if (!queuedAll) fetchAll(api, status)
  else {
    fetchMember(api, status.members)
    fetchCategory(api, status.categories)
    fetchThread(api, status.threads)
    fetchPost(api, status.posts)
    fetchProposal(api, status.proposals)
  }
  processNext()
  return status
}

const fetchAll = async (api: ApiPromise, status: Status) => {
  await getCouncils(api, status.block).then((rounds: Round[]) =>
    rounds.forEach((round) => fetchCouncil(api, round))
  )
  queue.push(() => fetchAccounts(api))
  queue.push(() => fetchMember(api, status.members))

  queue.push(() => fetchCategory(api, status.categories))
  queue.push(() => fetchThread(api, status.threads))
  queue.push(() => fetchPost(api, status.posts))

  queue.push(() => fetchProposal(api, status.proposals))
  queue.push(() => fetchProposalPosts(api))
  queuedAll = true
}

const processEvents = async (api: ApiPromise, blockId: number, hash: Hash) => {
  processing = `events block ${blockId}`
  console.log(processing)
  getEvents(api, hash).then((events) =>
    events.forEach((event: EventRecord) => saveEvent(blockId, event))
  )
}

const saveEvent = (blockId: number, event: EventRecord) => {
  const { section, method, data } = event.event
  if (section === 'system' && method === 'ExtrinsicSuccess') return
  if (section === 'imOnline' && method === 'HeartbeatReceived') return
  if (section === 'imOnline' && method === 'AllGood') return
  if (section === 'utility' && method === 'BatchCompleted') return
  if (section === 'grandpa' && method === 'NewAuthorities') return
  if (section === 'session' && method === 'NewSession') return
  console.log(section, method, data)
  // TODO catch votes, posts, proposals
  Event.create({ blockId, section, method, data: JSON.stringify(data) })
}

const importEraAtBlock = async (
  api: ApiPromise,
  blockId: number,
  hash: Hash
) => {
  const id = await getEra(api, hash)
  const [era] = await Era.findOrCreate({ where: { id } })
  era.addBlock(blockId)
  if (era.active) return
  processing = `era ${id}`
  getValidators(api, hash).then(async (validators: any[]) => {
    const validatorCount = validators.length
    if (!validatorCount) return
    console.log(`[Joystream] Found validator info for era ${id}`)
    era.slots = await getValidatorCount(api, hash)
    era.active = Math.min(era.slots, validatorCount)
    era.waiting = validatorCount > era.slots ? validatorCount - era.slots : 0
    era.stake = await getEraStake(api, hash, id)
    const timestamp = await getTimestamp(api, hash)
    console.log(id, timestamp, hash)
    era.timestamp = timestamp
    era.blockId = blockId
    era.save()
    updateBalances(api, hash)
  })
}

const validatorStatus = async (
  api: ApiPromise,
  blockId: BlockNumber | number
) => {
  const hash = await getBlockHash(api, blockId)
  const totalValidators = await getValidators(api, hash)
  if (!totalValidators.length) return
  const totalNrValidators = totalValidators.length
  const maxSlots = await getValidatorCount(api, hash)
  const actives = Math.min(maxSlots, totalNrValidators)
  const waiting =
    totalNrValidators > maxSlots ? totalNrValidators - maxSlots : 0
  const date = await getTimestamp(api, hash)
  console.log(`validator`, date)
  return { blockId, actives, waiting, maxSlots, date }
}

const updateBalances = async (api: ApiPromise, hash: Hash) => {
  const currentEra: number = await getEra(api, hash)
  const era = await Era.findOrCreate({ where: { id: currentEra } })
  try {
    processing = `balances ${era.id}`
    Account.findAll().then(async (account: any) => {
      const { key } = account
      if (!key) return
      console.log(`updating balance of`, key, key)

      const { data } = await getAccount(api, hash, key)
      const { free, reserved, miscFrozen, feeFrozen } = data
      const balance = { available: free, reserved, frozen: miscFrozen }
      console.log(`balance era ${era}`, balance)
      const where = { accountKey: key, eraId: era.id }
      const exists = Balance.findOne({ where })
      if (exists) Balance.update(balance, { where })
      else
        Balance.create(balance).then((balance: any) => {
          balance.setAccount(key)
          balance.setEra(era.id)
        })
    })
  } catch (e) {
    console.error(`balances era ${era}`)
  }
}

const fetchTokenomics = async () => {
  console.debug(`Updating tokenomics`)
  const { data } = await axios.get('https://status.joystream.org/status')
  if (!data) return
  // TODO save 'tokenomics', data
}

const fetchCategory = async (api: ApiPromise, id: number) => {
  if (id <= 0) return
  queue.push(() => fetchCategory(api, id - 1))
  const exists = await Category.findByPk(+id)
  if (exists) return exists

  processing = `category ${id}`
  const {
    created_at,
    title,
    description,
    deleted,
    archived,
    moderator_id,
    num_direct_subcategories,
    num_direct_moderated_threads,
    num_direct_unmoderated_threads,
    position_in_parent_category,
  } = await getCategory(api, id)
  const created = created_at.block.toNumber()
  const category = { id, title, description, created, deleted, archived }
  return Category.create(category).then((category: CategoryType) => {
    if (moderator_id)
      createModeration(api, { categoryId: id }, moderator_id, category)
    return category
  })
}

const fetchPost = async (api: ApiPromise, id: number): Promise<PostType> => {
  if (id > 1) queue.push(() => fetchPost(api, id - 1))
  const exists = await Post.findByPk(id)
  if (exists) return exists

  processing = `post ${id}`
  const { created_at, author_id, thread_id, current_text, moderation } =
    await getPost(api, id)
  const author = author_id
  const member = await fetchMemberByAccount(api, author)
  const authorId = member ? member.id : null
  const threadId = Number(thread_id)
  const thread = await fetchThread(api, threadId)
  const text = current_text
  const created = created_at.block.toNumber()
  const post = await savePost(id, { authorId, text, created, threadId })
  if (moderation)
    createModeration(api, { postId: id }, moderation.moderator_id, post)
  return post
}

const savePost = async (id: number, data: any): Promise<PostType> => {
  const [post] = await Post.findOrCreate({ where: { id } })
  post.update(data)
  return post
}

const createModeration = async (
  api: ApiPromise,
  association: {},
  accountId: AccountId,
  object: { setModeration: (id: number) => {} }
) => {
  if (!accountId) return
  const key = accountId.toHuman()
  await Account.findOrCreate({ where: { key } })
  const where = { ...association, moderatorKey: key }
  return // TODO
  const [moderation] = await Moderation.findOrCreate({ where })
  if (moderation) object.setModeration(moderation.id)
}

const fetchThread = async (api: ApiPromise, id: number) => {
  if (id <= 0) return
  const exists = await Thread.findByPk(id)
  if (exists) return exists

  processing = `thread ${id}`
  const {
    author_id,
    created_at,
    category_id,
    title,
    moderation,
    nr_in_category,
  } = await getThread(api, id)
  const [thread] = await Thread.findOrCreate({ where: { id } })
  thread.update({
    id,
    title,
    nrInCategory: +nr_in_category,
    created: +created_at.block,
  })
  const category = await fetchCategory(api, +category_id)
  if (category) thread.setCategory(category.id)
  const author = await fetchMemberByAccount(api, author_id)
  if (author) thread.setCreator(author.id)
  if (moderation) {
    const { moderated_at, moderator_id, rationale } = moderation
    const created = moderated_at.block
    const createdAt = moderated_at.time
    createModeration(
      api,
      { created, createdAt, rationale },
      moderator_id,
      thread
    )
  }
  return thread
}

// council
interface Council {
  round: number
  start: number
  startDate?: number
  end: number
  endDate?: number
}

const fetchCouncil = async (api: ApiPromise, term: Round) => {
  const { round, start, end } = term
  const exists = await Council.findByPk(round)
  //if (exists) return exists
  processing = `council ${round}`
  let council: Council = { start, end, round }
  const startHash = await getBlockHash(api, start)
  council.startDate = await getTimestamp(api, startHash)
  const seats: Seat[] = await getCouncil(api, startHash)
  const head = Number(await getHead(api))
  if (end < head) {
    const endHash = await getBlockHash(api, end)
    if (endHash) council.endDate = await getTimestamp(api, endHash)
  } else console.log(`fetchCouncil: round ${round} is ongoing.`)

  // TODO import report generator and save tokenomics
  saveCouncil(api, council, seats)
  saveCommitments(api, round, start - 2)
}

const saveCommitments = async (
  api: ApiPromise,
  round: number,
  block: number
) => {
  const hash = await getBlockHash(api, block)
  const commitments: Hash[] = await getCommitments(api, hash)
  const council = await Council.findByPk(round)
  if (!council)
    return console.warn(`saveCommitments: council ${round} not found.`)
  Promise.all(
    commitments.map((voteHash: Hash) => getCommitment(api, hash, voteHash))
  ).then((votes: SealedVote[]) =>
    votes.map(async (v) => {
      const voter: AccountId = v.voter
      const stake = v.stake.new.toNumber()
      const vote = String(v.vote)
      const member = await fetchMemberByAccount(api, voter)
      const memberId = member?.id
      Commitment.findOrCreate({
        where: { councilRound: round, stake, memberId },
      }).then(([c]: [CommitmentType]) => {
        if (vote) c.update({ vote })
        c.setCouncil(council.id)
      })
    })
  )
}

const saveCouncil = async (
  api: ApiPromise,
  council: Council,
  seats: Seat[]
) => {
  const { round } = council
  Council.findOrCreate({ where: { round } }).then(
    ([council]: [CouncilType]) => {
      council.update(council)
      seats.map((seat) =>
        fetchMemberByAccount(api, seat.member).then(
          (member: MemberType | undefined) =>
            member && saveConsul(api, round, member.id, seat)
        )
      )
    }
  )
}

const saveConsul = async (
  api: ApiPromise,
  councilRound: number,
  memberId: number,
  seat?: Seat
) => {
  const [consul] = await Consul.findOrCreate({
    where: { councilRound, memberId },
  })
  if (!seat) return
  const stake = Number(seat.stake)
  consul.update({ stake })
  seat.backers.map(async ({ member, stake }) =>
    fetchMemberByAccount(api, member).then(({ id }: any) =>
      saveCommitment(Number(stake), consul.id, id)
    )
  )
}

const saveCommitment = async (
  stake: number,
  consulId: number,
  memberId: number,
  vote?: string
) =>
  Commitment.findOrCreate({ where: { stake, consulId, memberId } }).then(
    ([c]: [CommitmentType]) => vote && c.update({ vote })
  )

const fetchProposal = async (api: ApiPromise, id: number) => {
  if (id <= 0) return
  queue.push(() => fetchProposal(api, id - 1))

  const exists = await Proposal.findByIdWithIncludes(id)
  if (exists && exists.result !== `Pending`) {
    if (!exists.votes.length) queue.push(() => fetchProposalVotes(api, id))
    return exists
  }

  processing = `proposal ${id}`
  const proposal = await getProposal(api, id as unknown as ProposalId)
  console.log(`proposal ${id}: ${proposal.result}`)
  await fetchMember(api, proposal.authorId)
  queue.push(() => fetchProposalVotes(api, id))
  // save
  const found = await Proposal.findByPk(id)
  if (found) Proposal.update(proposal, { where: { id } })
  else Proposal.create(proposal)
  return proposal
}

const saveProposalPost = (id: number, proposalId: number, data: any) =>
  ProposalPost.findOrCreate({ where: { id } }).then(
    ([post]: [ProposalPostType]) => {
      post.update(data)
      post.setProposal(proposalId)
      console.log(post)
    }
  )

const fetchProposalPosts = async (api: ApiPromise) => {
  processing = `proposal posts`
  getProposalPosts(api).then((posts: [any, DiscussionPost][]) => {
    posts.map(async (p) => {
      const [proposalId, id] = p[0].toHuman()
      await fetchProposal(api, proposalId);
      const { text, created_at, author_id, edition_number } = p[1]
      saveProposalPost(id, proposalId, {
        text: text.toHuman(),
        created: created_at.toNumber(),
        version: edition_number.toNumber(),
        authorId: author_id.toNumber(),
      })
    })
  })
}

const councilAt = (block: number): Promise<CouncilType> | void => {
  if (block)
    return Council.findOne({
      where: { start: { [Op.lte]: block }, end: { [Op.gte]: block } },
    })
}

const fetchProposalVotes = async (api: ApiPromise, id: number) => {
  const proposal = await Proposal.findByPk(id)
  if (!proposal)
    return console.warn(`fetchProposalVotes: proposal ${id} not found.`)
  processing = `votes proposal ${proposal.id}`

  // find council for creation and finalization time
  let councils: number[] = []
  const { created, finalizedAt } = proposal
  const councilStart = await councilAt(created)
  if (councilStart) {
    councilStart.addProposal(proposal.id)
    councils.push(councilStart.round)
  }
  const councilEnd = await councilAt(finalizedAt)
  if (councilEnd) councils.push(councilEnd.round)
  const votes = await getProposalVotes(api, id)
  votes?.forEach(({ memberId, vote }) =>
    saveProposalVote(id, councils, memberId, vote)
  )
}

const saveProposalVote = (
  proposalId: number,
  councils: number[],
  memberId: number,
  vote: string
): void =>
  Consul.findOne({
    where: { memberId, councilRound: { [Op.or]: councils } },
  }).then((consul: any) => {
    if (!consul)
      return console.log(`consul not found: member ${memberId}`, councils)
    const where = { memberId, proposalId, consulId: consul.id }
    if (!consul) return console.log(`saveProposalVote: No Consul found.`, where)
    ProposalVote.findOne({ where }).then((exists: any) => {
      const pv = { ...where, vote }
      if (!exists) ProposalVote.create(pv)
    })
  })

// accounts
const fetchAccounts = async (api: ApiPromise) => {
  processing = `accounts`
  getAccounts(api).then((accounts: AccountBalance[]) =>
    accounts.map(({ accountId }) =>
      Account.findOrCreate({ where: { key: accountId } })
    )
  )
}

const fetchMemberByAccount = async (
  api: ApiPromise,
  accountId: AccountId
): Promise<MemberType | undefined> => {
  const rootKey = accountId.toHuman()
  const member = await Member.findOne({ where: { rootKey } })
  if (member) return member
  const id = await getMemberIdByAccount(api, accountId)
  if (id) return fetchMember(api, id.toNumber())
}

const fetchMember = async (
  api: ApiPromise,
  id: number
): Promise<MemberType | undefined> => {
  if (id > 0) queue.push(() => fetchMember(api, id - 1))
  const exists = await Member.findByPk(id)
  if (exists && exists.handle) return exists

  processing = `member ${id}`
  const membership = await getMember(api, id)
  if (!membership) {
    console.warn(`fetchMember: empty membership`)
    return
  }
  const about = String(membership.about)
  const handle = String(membership.handle)
  const created = +membership.registered_at_block
  const rootKey = String(membership.root_account)
  const where = { id }
  return Member.findOrCreate({ where }).then(([member]: [MemberType]) => {
    member.update({ id, about, created, handle, rootKey })
    Account.findOrCreate({ where: { key: rootKey } }).then(([account]: any) =>
      account?.setMember(id)
    )
    return member
  })
}