import $ from 'jquery'
import omit from 'lodash/omit'
import URI from 'urijs'
import humps from 'humps'
import numeral from 'numeral'
import socket, { subscribeChannel } from '../socket'
import { createStore, connectElements } from '../lib/redux_helpers.js'
import { updateAllCalculatedUsdValues } from '../lib/currency.js'
import { loadTokenBalanceDropdown } from '../lib/token_balance_dropdown'

export const initialState = {
  channelDisconnected: false,

  addressHash: null,
  filter: null,

  balance: null,
  balanceCard: null,
  fetchedCoinBalanceBlockNumber: null,
  transactionCount: null,
  validationCount: null,
  countersFetched: false
}

export function reducer (state = initialState, action) {
  switch (action.type) {
    case 'PAGE_LOAD':
    case 'ELEMENTS_LOAD': {
      return Object.assign({}, state, omit(action, 'type'))
    }
    case 'CHANNEL_DISCONNECTED': {
      if (state.beyondPageOne) return state

      return Object.assign({}, state, {
        channelDisconnected: true
      })
    }
    case 'COUNTERS_FETCHED': {
      return Object.assign({}, state, {
        transactionCount: action.transactionCount,
        validationCount: action.validationCount,
        countersFetched: true
      })
    }
    case 'RECEIVED_NEW_BLOCK': {
      if (state.channelDisconnected) return state

      const validationCount = state.validationCount + 1
      return Object.assign({}, state, { validationCount })
    }
    case 'RECEIVED_NEW_TRANSACTION': {
      if (state.channelDisconnected) return state

      const transactionCount = (action.msg.fromAddressHash === state.addressHash) ? state.transactionCount + 1 : state.transactionCount

      return Object.assign({}, state, { transactionCount })
    }
    case 'RECEIVED_UPDATED_BALANCE': {
      return Object.assign({}, state, {
        balanceCard: action.msg.balanceCard,
        balance: parseFloat(action.msg.balance),
        fetchedCoinBalanceBlockNumber: action.msg.fetchedCoinBalanceBlockNumber
      })
    }
    default:
      return state
  }
}

const elements = {
  '[data-selector="channel-disconnected-message"]': {
    render ($el, state) {
      if (state.channelDisconnected) $el.show()
    }
  },
  '[data-selector="balance-card"]': {
    load ($el) {
      return { balanceCard: $el.html(), balance: parseFloat($el.find('.current-balance-in-wei').attr('data-wei-value')) }
    },
    render ($el, state, oldState) {
      if (oldState.balance === state.balance) return
      $el.empty().append(state.balanceCard)
      loadTokenBalanceDropdown()
      updateAllCalculatedUsdValues()
    }
  },
  '[data-selector="transaction-count"]': {
    load ($el) {
      return { transactionCount: numeral($el.text()).value() }
    },
    render ($el, state, oldState) {
      if (state.countersFetched && state.transactionCount) {
        if (oldState.transactionCount === state.transactionCount) return
        $el.empty().append('>= ' + numeral(state.transactionCount).format() + ' Transactions')
        $el.show()
        $el.parent('.address-detail-item').removeAttr('style')
      } else {
        $el.hide()
        $el.parent('.address-detail-item').css('display', 'none')
      }
    }
  },
  '[data-selector="fetched-coin-balance-block-number"]': {
    load ($el) {
      return {fetchedCoinBalanceBlockNumber: numeral($el.text()).value()}
    },
    render ($el, state, oldState) {
      if (oldState.fetchedCoinBalanceBlockNumber === state.fetchedCoinBalanceBlockNumber) return
      $el.empty().append(numeral(state.fetchedCoinBalanceBlockNumber).format())
    }
  },
  '[data-selector="validation-count"]': {
    load ($el) {
      return { validationCount: numeral($el.text()).value() }
    },
    render ($el, state, oldState) {
      if (state.countersFetched && state.validationCount) {
        if (oldState.validationCount === state.validationCount) return
        $el.empty().append(numeral(state.validationCount).format() + ' Blocks Validated')
        $el.show()
      } else {
        $el.hide()
      }
    }
  }
}

function loadCounters (store) {
  const $element = $('[data-async-counters]')
  const path = $element.data().asyncCounters

  function fetchCounters () {
    $.getJSON(path)
      .done(response => store.dispatch(Object.assign({type: 'COUNTERS_FETCHED'}, humps.camelizeKeys(response))))
  }

  fetchCounters()
}

const $addressDetailsPage = $('[data-page="address-details"]')
if ($addressDetailsPage.length) {
  const store = createStore(reducer)
  const addressHash = $addressDetailsPage[0].dataset.pageAddressHash
  const { filter, blockNumber } = humps.camelizeKeys(URI(window.location).query(true))
  store.dispatch({
    type: 'PAGE_LOAD',
    addressHash,
    filter,
    beyondPageOne: !!blockNumber
  })
  connectElements({ store, elements })

  const addressChannel = subscribeChannel(`addresses:${addressHash}`)

  addressChannel.onError(() => store.dispatch({
    type: 'CHANNEL_DISCONNECTED'
  }))
  addressChannel.on('balance', (msg) => store.dispatch({
    type: 'RECEIVED_UPDATED_BALANCE',
    msg: humps.camelizeKeys(msg)
  }))
  addressChannel.on('transaction', (msg) => {
    store.dispatch({
      type: 'RECEIVED_NEW_TRANSACTION',
      msg: humps.camelizeKeys(msg)
    })
  })

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

  addressChannel.push('get_balance', {})
    .receive('ok', (msg) => store.dispatch({
      type: 'RECEIVED_UPDATED_BALANCE',
      msg: humps.camelizeKeys(msg)
    }))

  loadCounters(store)
}