import $ from 'jquery'
import omit from 'lodash.omit'
import first from 'lodash.first'
import rangeRight from 'lodash.rangeright'
import find from 'lodash.find'
import map from 'lodash.map'
import humps from 'humps'
import numeral from 'numeral'
import socket from '../socket'
import { updateAllCalculatedUsdValues, formatUsdValue } from '../lib/currency'
import { createStore, connectElements } from '../lib/redux_helpers.js'
import { batchChannel, showLoader } from '../lib/utils'
import listMorph from '../lib/list_morph'
import '../app'

const BATCH_THRESHOLD = 6
const BLOCKS_PER_PAGE = 4

export const initialState = {
  addressCount: null,
  availableSupply: null,
  averageBlockTime: null,
  marketHistoryData: null,
  blocks: [],
  blocksLoading: true,
  blocksError: false,
  transactions: [],
  transactionsBatch: [],
  transactionsError: false,
  transactionsLoading: true,
  transactionCount: null,
  totalGasUsageCount: null,
  usdMarketCap: null,
  blockCount: null
}

export const reducer = withMissingBlocks(baseReducer)

function baseReducer (state = initialState, action) {
  switch (action.type) {
    case 'ELEMENTS_LOAD': {
      return Object.assign({}, state, omit(action, 'type'))
    }
    case 'RECEIVED_NEW_ADDRESS_COUNT': {
      return Object.assign({}, state, {
        addressCount: action.msg.count
      })
    }
    case 'RECEIVED_NEW_BLOCK': {
      const firstBlock = ($('#indexer-first-block').text() && parseInt($('#indexer-first-block').text(), 10)) || 0
      const blockCount = (action.msg.blockNumber - firstBlock) + 1
      // @ts-ignore
      if (!state.blocks.length || state.blocks[0].blockNumber < action.msg.blockNumber) {
        let pastBlocks
        if (state.blocks.length < BLOCKS_PER_PAGE) {
          pastBlocks = state.blocks
        } else {
          $('.miner-address-tooltip').tooltip('hide')
          pastBlocks = state.blocks.slice(0, -1)
        }
        return Object.assign({}, state, {
          averageBlockTime: action.msg.averageBlockTime,
          blocks: [
            action.msg,
            ...pastBlocks
          ],
          blockCount
        })
      } else {
        return Object.assign({}, state, {
          // @ts-ignore
          blocks: state.blocks.map((block) => block.blockNumber === action.msg.blockNumber ? action.msg : block),
          blockCount
        })
      }
    }
    case 'START_BLOCKS_FETCH': {
      return Object.assign({}, state, { blocksError: false, blocksLoading: true })
    }
    case 'BLOCKS_FINISH_REQUEST': {
      return Object.assign({}, state, { blocksLoading: false })
    }
    case 'BLOCKS_FETCHED': {
      return Object.assign({}, state, { blocks: [...action.msg.blocks], blocksLoading: false })
    }
    case 'BLOCKS_REQUEST_ERROR': {
      return Object.assign({}, state, { blocksError: true, blocksLoading: false })
    }
    case 'RECEIVED_NEW_EXCHANGE_RATE': {
      return Object.assign({}, state, {
        availableSupply: action.msg.exchangeRate.availableSupply,
        marketHistoryData: action.msg.marketHistoryData,
        usdMarketCap: action.msg.exchangeRate.marketCapUsd
      })
    }
    case 'RECEIVED_NEW_TRANSACTION_BATCH': {
      if (state.channelDisconnected) return state

      const transactionCount = state.transactionCount + action.msgs.length

      if (state.transactionsLoading || state.transactionsError) {
        return Object.assign({}, state, { transactionCount })
      }

      const transactionsLength = state.transactions.length + action.msgs.length
      if (transactionsLength < BATCH_THRESHOLD) {
        return Object.assign({}, state, {
          transactions: [
            ...action.msgs.reverse(),
            ...state.transactions
          ],
          transactionCount
        })
      } else if (!state.transactionsBatch.length && action.msgs.length < BATCH_THRESHOLD) {
        return Object.assign({}, state, {
          transactions: [
            ...action.msgs.reverse(),
            ...state.transactions.slice(0, -1 * action.msgs.length)
          ],
          transactionCount
        })
      } else {
        return Object.assign({}, state, {
          transactionsBatch: [
            ...action.msgs.reverse(),
            ...state.transactionsBatch
          ],
          transactionCount
        })
      }
    }
    case 'TRANSACTION_BATCH_EXPANDED': {
      return Object.assign({}, state, {
        transactionsBatch: []
      })
    }
    case 'RECEIVED_UPDATED_TRANSACTION_STATS': {
      return Object.assign({}, state, {
        transactionStats: action.msg.stats
      })
    }
    case 'START_TRANSACTIONS_FETCH':
      return Object.assign({}, state, { transactionsError: false, transactionsLoading: true })
    case 'TRANSACTIONS_FETCHED':
      return Object.assign({}, state, { transactions: [...action.msg.transactions] })
    case 'TRANSACTIONS_FETCH_ERROR':
      return Object.assign({}, state, { transactionsError: true })
    case 'FINISH_TRANSACTIONS_FETCH':
      return Object.assign({}, state, { transactionsLoading: false })
    default:
      return state
  }
}

function withMissingBlocks (reducer) {
  return (...args) => {
    const result = reducer(...args)

    if (!result.blocks || result.blocks.length < 2) return result

    const maxBlock = first(result.blocks).blockNumber
    const minBlock = maxBlock - (result.blocks.length - 1)

    return Object.assign({}, result, {
      blocks: rangeRight(minBlock, maxBlock + 1)
        .map((blockNumber) => find(result.blocks, ['blockNumber', blockNumber]) || {
          blockNumber,
          chainBlockHtml: placeHolderBlock(blockNumber)
        })
    })
  }
}

let chart
const elements = {
  '[data-chart="historyChart"]': {
    load () {
      // @ts-ignore
      chart = window.dashboardChart
    },
    render (_$el, state, oldState) {
      if (!chart || (oldState.availableSupply === state.availableSupply && oldState.marketHistoryData === state.marketHistoryData) || !state.availableSupply) return

      chart.updateMarketHistory(state.availableSupply, state.marketHistoryData)

      if (!chart || (JSON.stringify(oldState.transactionStats) === JSON.stringify(state.transactionStats))) return

      chart.updateTransactionHistory(state.transactionStats)
    }
  },
  '[data-selector="transaction-count"]': {
    load ($el) {
      return { transactionCount: numeral($el.text()).value() }
    },
    render ($el, state, oldState) {
      if (oldState.transactionCount === state.transactionCount) return
      $el.empty().append(numeral(state.transactionCount).format())
    }
  },
  '[data-selector="total-gas-usage"]': {
    load ($el) {
      return { totalGasUsageCount: numeral($el.text()).value() }
    },
    render ($el, state, oldState) {
      if (oldState.totalGasUsageCount === state.totalGasUsageCount) return
      $el.empty().append(numeral(state.totalGasUsageCount).format())
    }
  },
  '[data-selector="block-count"]': {
    load ($el) {
      return { blockCount: numeral($el.text()).value() }
    },
    render ($el, state, oldState) {
      if (oldState.blockCount === state.blockCount) return
      $el.empty().append(numeral(state.blockCount).format())
    }
  },
  '[data-selector="address-count"]': {
    render ($el, state, oldState) {
      if (oldState.addressCount === state.addressCount) return
      $el.empty().append(state.addressCount)
    }
  },
  '[data-selector="average-block-time"]': {
    render ($el, state, oldState) {
      if (oldState.averageBlockTime === state.averageBlockTime) return
      $el.empty().append(state.averageBlockTime)
    }
  },
  '[data-selector="market-cap"]': {
    render ($el, state, oldState) {
      if (oldState.usdMarketCap === state.usdMarketCap) return
      $el.empty().append(formatUsdValue(state.usdMarketCap))
    }
  },
  '[data-selector="tx_per_day"]': {
    render ($el, state, oldState) {
      if (!(JSON.stringify(oldState.transactionStats) === JSON.stringify(state.transactionStats))) {
        $el.empty().append(numeral(state.transactionStats[0].number_of_transactions).format('0,0'))
      }
    }
  },
  '[data-selector="chain-block-list"]': {
    load ($el) {
      return {
        blocksPath: $el[0].dataset.url
      }
    },
    render ($el, state, oldState) {
      if (oldState.blocks === state.blocks) return

      const container = $el[0]

      if (state.blocksLoading === false) {
        const blocks = map(state.blocks, ({ chainBlockHtml }) => $(chainBlockHtml)[0])
        listMorph(container, blocks, { key: 'dataset.blockNumber', horizontal: true })
      }
    }
  },
  '[data-selector="chain-block-list"] [data-selector="error-message"]': {
    render ($el, state, _oldState) {
      if (state.blocksError) {
        $el.show()
      } else {
        $el.hide()
      }
    }
  },
  '[data-selector="chain-block-list"] [data-selector="loading-message"]': {
    render ($el, state, _oldState) {
      showLoader(state.blocksLoading, $el)
    }
  },
  '[data-selector="transactions-list"] [data-selector="error-message"]': {
    render ($el, state, _oldState) {
      $el.toggle(state.transactionsError)
    }
  },
  '[data-selector="transactions-list"] [data-selector="loading-message"]': {
    render ($el, state, _oldState) {
      showLoader(state.transactionsLoading, $el)
    }
  },
  '[data-selector="transactions-list"]': {
    load ($el) {
      return { transactionsPath: $el[0].dataset.transactionsPath }
    },
    render ($el, state, oldState) {
      if (oldState.transactions === state.transactions) return
      const container = $el[0]
      const newElements = map(state.transactions, ({ transactionHtml }) => $(transactionHtml)[0])
      listMorph(container, newElements, { key: 'dataset.identifierHash', horizontal: null })
    }
  },
  '[data-selector="channel-batching-count"]': {
    render ($el, state, _oldState) {
      const $channelBatching = $('[data-selector="channel-batching-message"]')
      if (!state.transactionsBatch.length) return $channelBatching.hide()
      $channelBatching.show()
      $el[0].innerHTML = numeral(state.transactionsBatch.length).format()
    }
  }
}

const $chainDetailsPage = $('[data-page="chain-details"]')
if ($chainDetailsPage.length) {
  const store = createStore(reducer)
  connectElements({ store, elements })

  loadTransactions(store)
  bindTransactionErrorMessage(store)

  loadBlocks(store)
  bindBlockErrorMessage(store)

  const exchangeRateChannel = socket.channel('exchange_rate:new_rate')
  exchangeRateChannel.join()
  exchangeRateChannel.on('new_rate', (msg) => {
    updateAllCalculatedUsdValues(humps.camelizeKeys(msg).exchangeRate.usdValue)
    store.dispatch({
      type: 'RECEIVED_NEW_EXCHANGE_RATE',
      msg: humps.camelizeKeys(msg)
    })
  })

  const addressesChannel = socket.channel('addresses:new_address')
  addressesChannel.join()
  addressesChannel.on('count', msg => store.dispatch({
    type: 'RECEIVED_NEW_ADDRESS_COUNT',
    msg: humps.camelizeKeys(msg)
  }))

  const blocksChannel = socket.channel('blocks:new_block')
  blocksChannel.join()
  blocksChannel.on('new_block', msg => store.dispatch({
    type: 'RECEIVED_NEW_BLOCK',
    msg: humps.camelizeKeys(msg)
  }))

  const transactionsChannel = socket.channel('transactions:new_transaction')
  transactionsChannel.join()
  transactionsChannel.on('transaction', batchChannel((msgs) => store.dispatch({
    type: 'RECEIVED_NEW_TRANSACTION_BATCH',
    msgs: humps.camelizeKeys(msgs)
  })))

  const transactionStatsChannel = socket.channel('transactions:stats')
  transactionStatsChannel.join()
  transactionStatsChannel.on('update', msg => store.dispatch({
    type: 'RECEIVED_UPDATED_TRANSACTION_STATS',
    msg
  }))

  const $txReloadButton = $('[data-selector="reload-transactions-button"]')
  const $channelBatching = $('[data-selector="channel-batching-message"]')
  $txReloadButton.on('click', (event) => {
    event.preventDefault()
    loadTransactions(store)
    $channelBatching.hide()
    store.dispatch({
      type: 'TRANSACTION_BATCH_EXPANDED'
    })
  })
}

function loadTransactions (store) {
  const path = store.getState().transactionsPath
  store.dispatch({ type: 'START_TRANSACTIONS_FETCH' })
  $.getJSON(path)
    .done(response => store.dispatch({ type: 'TRANSACTIONS_FETCHED', msg: humps.camelizeKeys(response) }))
    .fail(() => store.dispatch({ type: 'TRANSACTIONS_FETCH_ERROR' }))
    .always(() => store.dispatch({ type: 'FINISH_TRANSACTIONS_FETCH' }))
}

function bindTransactionErrorMessage (store) {
  $('[data-selector="transactions-list"] [data-selector="error-message"]').on('click', _event => loadTransactions(store))
}

export function placeHolderBlock (blockNumber) {
  return `
    <div
      class="col-lg-3 d-flex fade-up-blocks-chain"
      data-block-number="${blockNumber}"
      data-selector="place-holder"
    >
      <div
        class="tile tile-type-block d-flex align-items-center fade-up"
      >
        <span class="loading-spinner-small ml-1 mr-4">
          <span class="loading-spinner-block-1"></span>
          <span class="loading-spinner-block-2"></span>
        </span>
        <div>
          <span class="tile-title pr-0 pl-0">${blockNumber}</span>
          <div class="tile-transactions">${
            // @ts-ignore
            window.localized['Block Processing']
          }</div>
        </div>
      </div>
    </div>
  `
}

function loadBlocks (store) {
  const url = store.getState().blocksPath

  store.dispatch({ type: 'START_BLOCKS_FETCH' })

  $.getJSON(url)
    .done(response => {
      store.dispatch({ type: 'BLOCKS_FETCHED', msg: humps.camelizeKeys(response) })
    })
    .fail(() => store.dispatch({ type: 'BLOCKS_REQUEST_ERROR' }))
    .always(() => store.dispatch({ type: 'BLOCKS_FINISH_REQUEST' }))
}

function bindBlockErrorMessage (store) {
  $('[data-selector="chain-block-list"] [data-selector="error-message"]').on('click', _event => loadBlocks(store))
}