import '../../css/stakes.scss'

import $ from 'jquery'
import _ from 'lodash'
import { subscribeChannel } from '../socket'
import { connectElements } from '../lib/redux_helpers.js'
import { createAsyncLoadStore, refreshPage } from '../lib/async_listing_load'
import Queue from '../lib/queue'
import Web3 from 'web3'
import { openPoolInfoModal } from './stakes/validator_info'
import { openDelegatorsListModal } from './stakes/delegators_list'
import { openBecomeCandidateModal, becomeCandidateConnectionLost } from './stakes/become_candidate'
import { openRemovePoolModal } from './stakes/remove_pool'
import { openMakeStakeModal } from './stakes/make_stake'
import { openMoveStakeModal } from './stakes/move_stake'
import { openWithdrawStakeModal } from './stakes/withdraw_stake'
import { openClaimRewardModal, claimRewardConnectionLost } from './stakes/claim_reward'
import { openClaimWithdrawalModal } from './stakes/claim_withdrawal'
import { checkForTokenDefinition, isSupportedNetwork } from './stakes/utils'
import { currentModal, openWarningModal, openErrorModal } from '../lib/modals'

const stakesPageSelector = '[data-page="stakes"]'

export const initialState = {
  account: null,
  blockRewardContract: null,
  channel: null,
  currentBlockNumber: 0, // current block number
  finishRequestResolve: null,
  lastEpochNumber: 0,
  network: null,
  refreshBlockNumber: 0, // last page refresh block number
  refreshInterval: null,
  refreshPageFunc: refreshPageWrapper,
  stakingAllowed: false,
  stakingTokenDefined: false,
  stakingContract: null,
  tokenDecimals: 0,
  tokenSymbol: '',
  validatorSetApplyBlock: 0,
  validatorSetContract: null,
  web3: null
}

// 100 - id of xDai network, 101 - id of xDai test network
export const allowedNetworkIds = [100, 101]

export function reducer (state = initialState, action) {
  switch (action.type) {
    case 'PAGE_LOAD':
    case 'ELEMENTS_LOAD': {
      return Object.assign({}, state, _.omit(action, 'type'))
    }
    case 'CHANNEL_CONNECTED': {
      return Object.assign({}, state, { channel: action.channel })
    }
    case 'WEB3_DETECTED': {
      return Object.assign({}, state, { web3: action.web3 })
    }
    case 'ACCOUNT_UPDATED': {
      return Object.assign({}, state, {
        account: action.account,
        additionalParams: Object.assign({}, state.additionalParams, {
          account: action.account
        })
      })
    }
    case 'BLOCK_CREATED': {
      return Object.assign({}, state, {
        currentBlockNumber: action.currentBlockNumber
      })
    }
    case 'NETWORK_UPDATED': {
      return Object.assign({}, state, {
        network: action.network,
        additionalParams: Object.assign({}, state.additionalParams, {
          network: action.network
        })
      })
    }
    case 'FILTERS_UPDATED': {
      return Object.assign({}, state, {
        additionalParams: Object.assign({}, state.additionalParams, {
          filterBanned: 'filterBanned' in action ? action.filterBanned : state.additionalParams.filterBanned,
          filterMy: 'filterMy' in action ? action.filterMy : state.additionalParams.filterMy
        })
      })
    }
    case 'PAGE_REFRESHED': {
      return Object.assign({}, state, {
        refreshBlockNumber: action.refreshBlockNumber,
        finishRequestResolve: action.finishRequestResolve
      })
    }
    case 'RECEIVED_UPDATE': {
      return Object.assign({}, state, {
        lastEpochNumber: action.lastEpochNumber,
        stakingAllowed: action.stakingAllowed,
        stakingTokenDefined: action.stakingTokenDefined,
        validatorSetApplyBlock: action.validatorSetApplyBlock
      })
    }
    case 'RECEIVED_CONTRACTS': {
      return Object.assign({}, state, {
        stakingContract: action.stakingContract,
        blockRewardContract: action.blockRewardContract,
        validatorSetContract: action.validatorSetContract,
        tokenDecimals: action.tokenDecimals,
        tokenSymbol: action.tokenSymbol
      })
    }
    case 'FINISH_REQUEST': {
      $(stakesPageSelector).fadeTo(0, 1)
      if (state.finishRequestResolve) {
        state.finishRequestResolve()
        return Object.assign({}, state, {
          finishRequestResolve: null
        })
      }
      return state
    }
    default:
      return state
  }
}

const elements = {
  '[data-page="stakes"]': {
    load ($el) {
      return {
        refreshInterval: $el.data('refresh-interval') || null,
        additionalParams: {
          filterBanned: $el.find('[pool-filter-banned]').prop('checked'),
          filterMy: $el.find('[pool-filter-my]').prop('checked')
        }
      }
    }
  }
}

const $stakesPage = $(stakesPageSelector)
const $stakesTop = $('[data-selector="stakes-top"]')
const $refreshInformer = $('.refresh-informer', $stakesPage)
if ($stakesPage.length) {
  const store = createAsyncLoadStore(reducer, initialState, 'dataset.identifierPool')
  connectElements({ store, elements })

  const channel = subscribeChannel('stakes:staking_update')
  store.dispatch({ type: 'CHANNEL_CONNECTED', channel })

  let updating = false

  async function onStakingUpdate (msg) { // eslint-disable-line no-inner-declarations
    const state = store.getState()

    if (state.finishRequestResolve || updating) {
      return
    }
    updating = true

    store.dispatch({ type: 'BLOCK_CREATED', currentBlockNumber: msg.block_number })

    // hide tooltip on tooltip triggering element reloading
    // due to issues with bootstrap tooltips https://github.com/twbs/bootstrap/issues/13133
    const stakesTopTooltipID = $('[aria-describedby]', $stakesTop).attr('aria-describedby')
    $('#' + stakesTopTooltipID).hide()

    $stakesTop.html(msg.top_html)

    if (accountChanged(msg.account, state)) {
      store.dispatch({ type: 'ACCOUNT_UPDATED', account: msg.account })
      resetFilterMy(store)
    }

    if (
      msg.staking_allowed !== state.stakingAllowed ||
      msg.epoch_number > state.lastEpochNumber ||
      msg.validator_set_apply_block !== state.validatorSetApplyBlock ||
      (state.refreshInterval && msg.block_number >= state.refreshBlockNumber + state.refreshInterval) ||
      accountChanged(msg.account, state) ||
      msg.by_set_account
    ) {
      await reloadPoolList(msg, store)
    }

    const refreshBlockNumber = store.getState().refreshBlockNumber
    const refreshGap = msg.block_number - refreshBlockNumber
    $refreshInformer.find('span').html(refreshGap)
    if (refreshGap > 0 && refreshBlockNumber > 0) {
      $refreshInformer.show()
    } else {
      $refreshInformer.hide()
    }

    const $refreshInformerLink = $refreshInformer.find('a')
    $refreshInformerLink.off('click')
    $refreshInformerLink.on('click', async (event) => {
      event.preventDefault()
      if (!store.getState().finishRequestResolve) {
        $refreshInformer.hide()
        $stakesPage.fadeTo(0, 0.5)
        await reloadPoolList(msg, store)
      }
    })

    updating = false
  }

  const messagesQueue = new Queue()

  setTimeout(async () => {
    while (true) {
      const msg = messagesQueue.dequeue()
      if (msg) {
        // Synchronously handle the message
        await onStakingUpdate(msg)
      } else {
        // Wait for the next message
        await new Promise(resolve => setTimeout(resolve, 10))
      }
    }
  }, 0)

  channel.on('staking_update', msg => {
    messagesQueue.enqueue(msg)
  })

  channel.on('contracts', msg => {
    const web3 = store.getState().web3
    const stakingContract =
      new web3.eth.Contract(msg.staking_contract.abi, msg.staking_contract.address)
    const blockRewardContract =
      new web3.eth.Contract(msg.block_reward_contract.abi, msg.block_reward_contract.address)
    const validatorSetContract =
      new web3.eth.Contract(msg.validator_set_contract.abi, msg.validator_set_contract.address)

    store.dispatch({
      type: 'RECEIVED_CONTRACTS',
      stakingContract,
      blockRewardContract,
      validatorSetContract,
      tokenDecimals: parseInt(msg.token_decimals, 10),
      tokenSymbol: msg.token_symbol
    })
  })

  channel.onError(becomeCandidateConnectionLost)
  channel.onError(claimRewardConnectionLost)

  $(document.body)
    .on('click', '.js-pool-info', event => {
      if (checkForTokenDefinition(store)) {
        openPoolInfoModal(event, store)
      }
    })
    .on('click', '.js-delegators-list', event => {
      openDelegatorsListModal(event, store)
    })
    .on('click', '.js-become-candidate', event => {
      if (checkForTokenDefinition(store)) {
        openBecomeCandidateModal(event, store)
      }
    })
    .on('click', '.js-remove-pool', () => {
      openRemovePoolModal(store)
    })
    .on('click', '.js-make-stake', event => {
      if (checkForTokenDefinition(store)) {
        openMakeStakeModal(event, store)
      }
    })
    .on('click', '.js-move-stake', event => {
      if (checkForTokenDefinition(store)) {
        openMoveStakeModal(event, store)
      }
    })
    .on('click', '.js-withdraw-stake', event => {
      if (checkForTokenDefinition(store)) {
        openWithdrawStakeModal(event, store)
      }
    })
    .on('click', '.js-claim-reward', event => {
      if (checkForTokenDefinition(store)) {
        openClaimRewardModal(event, store)
      }
    })
    .on('click', '.js-claim-withdrawal', event => {
      if (checkForTokenDefinition(store)) {
        openClaimWithdrawalModal(event, store)
      }
    })

  $stakesPage
    .on('change', '[pool-filter-banned]', () => updateFilters(store, 'banned'))
    .on('change', '[pool-filter-my]', () => updateFilters(store, 'my'))

  initialize(store)
}

function accountChanged (account, state) {
  return account !== state.account
}

async function getAccounts () {
  let accounts = []
  try {
    accounts = await window.ethereum.request({ method: 'eth_accounts' })
  } catch (e) {
    console.error('eth_accounts request failed. Make sure you are using the latest version of MetaMask')
    openErrorModal('Get account', 'Cannot get your account address. Make sure you are using the latest version of MetaMask')
  }
  return accounts
}

async function getNetId (web3) {
  let netId = null
  if (!window.ethereum.chainId) {
    console.error('Cannot get chainId. Make sure you are using the latest MetaMask version')
  } else {
    const { chainId } = window.ethereum
    netId = web3.utils.isHex(chainId) ? web3.utils.hexToNumber(chainId) : chainId
  }
  return netId
}

function hideCurrentModal () {
  const $modal = currentModal()
  if ($modal) $modal.modal('hide')
}

function initialize (store) {
  if (window.ethereum) {
    const web3 = new Web3(window.ethereum)
    if (window.ethereum.autoRefreshOnNetworkChange) {
      window.ethereum.autoRefreshOnNetworkChange = false
    }
    store.dispatch({ type: 'WEB3_DETECTED', web3 })

    initNetworkAndAccount(store, web3)

    window.ethereum.on('chainChanged', async (chainId) => {
      const newNetId = web3.utils.isHex(chainId) ? web3.utils.hexToNumber(chainId) : chainId
      setNetwork(newNetId, store)
    })

    window.ethereum.on('accountsChanged', async (accs) => {
      const newAccount = accs && accs.length > 0 ? accs[0].toLowerCase() : null
      if (accountChanged(newAccount, store.getState())) {
        await setAccount(newAccount, store)
      }
    })

    $stakesTop.on('click', '[data-selector="login-button"]', loginByMetamask)
  } else {
    // We do the first load immediately if the latest version of MetaMask is not installed
    refreshPageWrapper(store)
  }
}

async function initNetworkAndAccount (store, web3) {
  const state = store.getState()
  const networkId = await getNetId(web3)

  if (!state.network || (networkId !== state.network.id)) {
    setNetwork(networkId, store)
  }

  const accounts = await getAccounts()
  const account = accounts[0] ? accounts[0].toLowerCase() : null

  if (accountChanged(account, state)) {
    await setAccount(account, store)
    // We don't call `refreshPageWrapper` in this case because it will be called
    // by the `onStakingUpdate` function
  } else {
    await refreshPageWrapper(store)
  }
}

async function loginByMetamask () {
  event.stopPropagation()
  event.preventDefault()
  try {
    await window.ethereum.request({ method: 'eth_requestAccounts' })
  } catch (e) {
    console.log(e)
    if (e.code !== 4001) {
      console.error('eth_requestAccounts failed. Make sure you are using the latest MetaMask version')
      openErrorModal('Request account access', 'Cannot request access to your account in MetaMask. Make sure you are using the latest version of MetaMask')
    }
  }
}

async function refreshPageWrapper (store) {
  while (store.getState().finishRequestResolve) {
    // Don't let anything simultaneously refresh the page
    await new Promise(resolve => setTimeout(resolve, 10))
  }

  let currentBlockNumber = store.getState().currentBlockNumber
  if (!currentBlockNumber) {
    currentBlockNumber = $('[data-block-number]', $stakesTop).data('blockNumber')
  }

  await new Promise(resolve => {
    store.dispatch({
      type: 'PAGE_REFRESHED',
      refreshBlockNumber: currentBlockNumber,
      finishRequestResolve: resolve
    })
    $refreshInformer.hide()
    refreshPage(store)
  })
}

async function reloadPoolList (msg, store) {
  store.dispatch({
    type: 'RECEIVED_UPDATE',
    lastEpochNumber: msg.epoch_number,
    stakingAllowed: msg.staking_allowed,
    stakingTokenDefined: msg.staking_token_defined,
    validatorSetApplyBlock: msg.validator_set_apply_block
  })
  await refreshPageWrapper(store)
}

function resetFilterMy (store) {
  $stakesPage.find('[pool-filter-my]').prop('checked', false)
  store.dispatch({ type: 'FILTERS_UPDATED', filterMy: false })
}

function setAccount (account, store) {
  return new Promise(resolve => {
    store.dispatch({ type: 'ACCOUNT_UPDATED', account })
    if (!account) {
      resetFilterMy(store)
    }

    const errorMsg = 'Cannot properly set account due to connection loss. Please, reload the page.'
    const $addressField = $('.stakes-top-stats-item-address .stakes-top-stats-value')
    $addressField.html('Loading...')
    store.getState().channel.push(
      'set_account', account
    ).receive('ok', () => {
      if (account) {
        $addressField.html(`
          <div data-placement="bottom" data-toggle="tooltip" title="${account}">
            ${account}
          </div>
        `)
      }
      hideCurrentModal()
      resolve(true)
    }).receive('error', () => {
      openErrorModal('Change account', errorMsg, true)
      resolve(false)
    }).receive('timeout', () => {
      openErrorModal('Change account', errorMsg, true)
      resolve(false)
    })
  })
}

function setNetwork (networkId, store) {
  hideCurrentModal()

  const network = {
    id: networkId,
    authorized: false
  }

  if (allowedNetworkIds.includes(networkId)) {
    network.authorized = true
  }

  store.dispatch({ type: 'NETWORK_UPDATED', network })

  isSupportedNetwork(store)
}

function updateFilters (store, filterType) {
  const filterBanned = $stakesPage.find('[pool-filter-banned]')
  const filterMy = $stakesPage.find('[pool-filter-my]')
  const state = store.getState()

  if (state.finishRequestResolve) {
    if (filterType === 'my') {
      filterMy.prop('checked', !filterMy.prop('checked'))
    } else {
      filterBanned.prop('checked', !filterBanned.prop('checked'))
    }
    openWarningModal('Still loading', 'The previous request to load pool list is not yet finished. Please, wait...')
    return
  }

  if (filterType === 'my' && !state.account) {
    filterMy.prop('checked', false)
    openWarningModal('Unauthorized', 'You are not logged in. Please login with the latest version of MetaMask')
    return
  }
  store.dispatch({
    type: 'FILTERS_UPDATED',
    filterBanned: filterBanned.prop('checked'),
    filterMy: filterMy.prop('checked')
  })
  refreshPageWrapper(store)
}