/* eslint-disable react-hooks/exhaustive-deps */
import React, { useCallback, useEffect, useMemo, useState } from 'react'
import { getCookie } from 'cookies-next'
import { useSnapshot } from 'valtio'
import { useTranslation } from 'next-i18next'

import { AxiosResponse } from 'axios'
import debounce from 'lodash.debounce'

import SummonUnit from '~components/SummonUnit'
import ExtraSummons from '~components/ExtraSummons'

import api from '~utils/api'
import { appState } from '~utils/appState'
import type { SearchableObject } from '~types'

import './index.scss'

// Props
interface Props {
  new: boolean
  summons?: GridSummon[]
  createParty: () => Promise<AxiosResponse<any, any>>
  pushHistory?: (path: string) => void
}

const SummonGrid = (props: Props) => {
  // Constants
  const numSummons: number = 4

  // Cookies
  const cookie = getCookie('account')
  const accountData: AccountCookie = cookie
    ? JSON.parse(cookie as string)
    : null
  const headers = accountData
    ? { headers: { Authorization: `Bearer ${accountData.token}` } }
    : {}

  // Localization
  const { t } = useTranslation('common')

  // Set up state for view management
  const { party, grid } = useSnapshot(appState)
  const [slug, setSlug] = useState()

  // Create a temporary state to store previous weapon uncap value
  const [previousUncapValues, setPreviousUncapValues] = useState<{
    [key: number]: number
  }>({})

  // Set the editable flag only on first load
  useEffect(() => {
    // If user is logged in and matches
    if (
      (accountData && party.user && accountData.userId === party.user.id) ||
      props.new
    )
      appState.party.editable = true
    else appState.party.editable = false
  }, [props.new, accountData, party])

  // Initialize an array of current uncap values for each summon
  useEffect(() => {
    let initialPreviousUncapValues: { [key: number]: number } = {}

    if (appState.grid.summons.mainSummon)
      initialPreviousUncapValues[-1] =
        appState.grid.summons.mainSummon.uncap_level

    if (appState.grid.summons.friendSummon)
      initialPreviousUncapValues[6] =
        appState.grid.summons.friendSummon.uncap_level

    Object.values(appState.grid.summons.allSummons).map((o) =>
      o ? (initialPreviousUncapValues[o.position] = o.uncap_level) : 0
    )

    setPreviousUncapValues(initialPreviousUncapValues)
  }, [
    appState.grid.summons.mainSummon,
    appState.grid.summons.friendSummon,
    appState.grid.summons.allSummons,
  ])

  // Methods: Adding an object from search
  function receiveSummonFromSearch(object: SearchableObject, position: number) {
    const summon = object as Summon

    if (!party.id) {
      props.createParty().then((response) => {
        const party = response.data.party
        appState.party.id = party.id
        setSlug(party.shortcode)

        if (props.pushHistory) props.pushHistory(`/p/${party.shortcode}`)

        saveSummon(party.id, summon, position).then((response) =>
          storeGridSummon(response.data.grid_summon)
        )
      })
    } else {
      if (party.editable)
        saveSummon(party.id, summon, position).then((response) =>
          storeGridSummon(response.data.grid_summon)
        )
    }
  }

  async function saveSummon(partyId: string, summon: Summon, position: number) {
    let uncapLevel = 3
    if (summon.uncap.ulb) uncapLevel = 5
    else if (summon.uncap.flb) uncapLevel = 4

    return await api.endpoints.summons.create(
      {
        summon: {
          party_id: partyId,
          summon_id: summon.id,
          position: position,
          main: position == -1,
          friend: position == 6,
          uncap_level: uncapLevel,
        },
      },
      headers
    )
  }

  function storeGridSummon(gridSummon: GridSummon) {
    if (gridSummon.position == -1) appState.grid.summons.mainSummon = gridSummon
    else if (gridSummon.position == 6)
      appState.grid.summons.friendSummon = gridSummon
    else appState.grid.summons.allSummons[gridSummon.position] = gridSummon
  }

  // Methods: Updating uncap level
  // Note: Saves, but debouncing is not working properly
  async function saveUncap(id: string, position: number, uncapLevel: number) {
    storePreviousUncapValue(position)

    try {
      if (uncapLevel != previousUncapValues[position])
        await api.updateUncap('summon', id, uncapLevel).then((response) => {
          storeGridSummon(response.data.grid_summon)
        })
    } catch (error) {
      console.error(error)

      // Revert optimistic UI
      updateUncapLevel(position, previousUncapValues[position])

      // Remove optimistic key
      let newPreviousValues = { ...previousUncapValues }
      delete newPreviousValues[position]
      setPreviousUncapValues(newPreviousValues)
    }
  }

  function initiateUncapUpdate(
    id: string,
    position: number,
    uncapLevel: number
  ) {
    memoizeAction(id, position, uncapLevel)

    // Optimistically update UI
    updateUncapLevel(position, uncapLevel)
  }

  const memoizeAction = useCallback(
    (id: string, position: number, uncapLevel: number) => {
      debouncedAction(id, position, uncapLevel)
    },
    [props, previousUncapValues]
  )

  const debouncedAction = useMemo(
    () =>
      debounce((id, position, number) => {
        saveUncap(id, position, number)
      }, 500),
    [props, saveUncap]
  )

  const updateUncapLevel = (position: number, uncapLevel: number) => {
    if (appState.grid.summons.mainSummon && position == -1)
      appState.grid.summons.mainSummon.uncap_level = uncapLevel
    else if (appState.grid.summons.friendSummon && position == 6)
      appState.grid.summons.friendSummon.uncap_level = uncapLevel
    else {
      const summon = appState.grid.summons.allSummons[position]
      if (summon) {
        summon.uncap_level = uncapLevel
        appState.grid.summons.allSummons[position] = summon
      }
    }
  }

  function storePreviousUncapValue(position: number) {
    // Save the current value in case of an unexpected result
    let newPreviousValues = { ...previousUncapValues }

    if (appState.grid.summons.mainSummon && position == -1)
      newPreviousValues[position] = appState.grid.summons.mainSummon.uncap_level
    else if (appState.grid.summons.friendSummon && position == 6)
      newPreviousValues[position] =
        appState.grid.summons.friendSummon.uncap_level
    else {
      const summon = appState.grid.summons.allSummons[position]
      newPreviousValues[position] = summon ? summon.uncap_level : 0
    }

    setPreviousUncapValues(newPreviousValues)
  }

  // Render: JSX components
  const mainSummonElement = (
    <div className="LabeledUnit">
      <div className="Label">{t('summons.main')}</div>
      <SummonUnit
        gridSummon={grid.summons.mainSummon}
        editable={party.editable}
        key="grid_main_summon"
        position={-1}
        unitType={0}
        updateObject={receiveSummonFromSearch}
        updateUncap={initiateUncapUpdate}
      />
    </div>
  )

  const friendSummonElement = (
    <div className="LabeledUnit">
      <div className="Label">{t('summons.friend')}</div>
      <SummonUnit
        gridSummon={grid.summons.friendSummon}
        editable={party.editable}
        key="grid_friend_summon"
        position={6}
        unitType={2}
        updateObject={receiveSummonFromSearch}
        updateUncap={initiateUncapUpdate}
      />
    </div>
  )
  const summonGridElement = (
    <div id="LabeledGrid">
      <div className="Label">{t('summons.summons')}</div>
      <ul id="grid_summons">
        {Array.from(Array(numSummons)).map((x, i) => {
          return (
            <li key={`grid_unit_${i}`}>
              <SummonUnit
                gridSummon={grid.summons.allSummons[i]}
                editable={party.editable}
                position={i}
                unitType={1}
                updateObject={receiveSummonFromSearch}
                updateUncap={initiateUncapUpdate}
              />
            </li>
          )
        })}
      </ul>
    </div>
  )
  const subAuraSummonElement = (
    <ExtraSummons
      grid={grid.summons.allSummons}
      editable={party.editable}
      exists={false}
      offset={numSummons}
      updateObject={receiveSummonFromSearch}
      updateUncap={initiateUncapUpdate}
    />
  )
  return (
    <div>
      <div id="SummonGrid">
        {mainSummonElement}
        {friendSummonElement}
        {summonGridElement}
      </div>

      {subAuraSummonElement}
    </div>
  )
}

export default SummonGrid