import { Play } from 'phosphor-react'
import { FC, useCallback, useEffect } from 'react'
import { useSnapshot } from 'valtio'
import state from '../../state'
import {
  defaultTransactionType,
  getTxFields,
  modifyTxState,
  prepareState,
  prepareTransaction,
  SelectOption,
  TransactionState
} from '../../state/transactions'
import { sendTransaction } from '../../state/actions'
import Box from '../Box'
import Button from '../Button'
import Flex from '../Flex'
import { TxJson } from './json'
import { TxUI } from './ui'
import { default as _estimateFee } from '../../utils/estimateFee'
import toast from 'react-hot-toast'
import { combineFlags, extractFlags, transactionFlags } from '../../state/constants/flags'
import { SetHookData, toHex } from '../../utils/setHook'

export interface TransactionProps {
  header: string
  state: TransactionState
}

const Transaction: FC<TransactionProps> = ({ header, state: txState, ...props }) => {
  const { accounts, editorSettings } = useSnapshot(state)
  const { selectedAccount, selectedTransaction, txIsDisabled, txIsLoading, viewType, editorValue } =
    txState

  const setState = useCallback(
    (pTx?: Partial<TransactionState>) => {
      return modifyTxState(header, pTx)
    },
    [header]
  )

  const prepareOptions = useCallback(
    (state: Partial<TransactionState> = txState) => {
      const {
        selectedTransaction,
        selectedDestAccount,
        selectedAccount,
        txFields,
        selectedFlags,
        hookParameters
      } = state

      const TransactionType = selectedTransaction?.value || null
      const Destination = selectedDestAccount?.value || txFields?.Destination
      const Account = selectedAccount?.value || null
      const Flags = combineFlags(selectedFlags?.map(flag => flag.value)) || txFields?.Flags
      const HookParameters = Object.entries(hookParameters || {}).reduce<
        SetHookData['HookParameters']
      >((acc, [_, { label, value }]) => {
        return acc.concat({
          HookParameter: { HookParameterName: toHex(label), HookParameterValue: toHex(value) }
        })
      }, [])

      return prepareTransaction({
        ...txFields,
        HookParameters,
        Flags,
        TransactionType,
        Destination,
        Account
      })
    },
    [txState]
  )

  useEffect(() => {
    const transactionType = selectedTransaction?.value
    const account = selectedAccount?.value
    if (!account || !transactionType || txIsLoading) {
      setState({ txIsDisabled: true })
    } else {
      setState({ txIsDisabled: false })
    }
  }, [selectedAccount?.value, selectedTransaction?.value, setState, txIsLoading])

  const submitTest = useCallback(async () => {
    let st: TransactionState | undefined
    const tt = txState.selectedTransaction?.value
    if (viewType === 'json') {
      // save the editor state first
      const pst = prepareState(editorValue || '', tt)
      if (!pst) return

      st = setState(pst)
    }

    const account = accounts.find(acc => acc.address === selectedAccount?.value)
    if (txIsDisabled) return

    setState({ txIsLoading: true })
    const logPrefix = header ? `${header.split('.')[0]}: ` : undefined
    try {
      if (!account) {
        throw Error('Account must be selected from imported accounts!')
      }
      const options = prepareOptions(st)

      const fields = getTxFields(options.TransactionType)
      if (fields.Destination && !options.Destination) {
        throw Error('Destination account is required!')
      }

      await sendTransaction(account, options, { logPrefix })
    } catch (error) {
      console.error(error)
      if (error instanceof Error) {
        state.transactionLogs.push({
          type: 'error',
          message: `${logPrefix}${error.message}`
        })
      }
    }
    setState({ txIsLoading: false })
  }, [
    viewType,
    accounts,
    txIsDisabled,
    setState,
    header,
    editorValue,
    txState,
    selectedAccount?.value,
    prepareOptions
  ])

  const getJsonString = useCallback(
    (state?: Partial<TransactionState>) =>
      JSON.stringify(prepareOptions?.(state) || {}, null, editorSettings.tabSize),
    [editorSettings.tabSize, prepareOptions]
  )

  const resetState = useCallback(
    (transactionType: SelectOption | undefined = defaultTransactionType) => {
      const fields = getTxFields(transactionType?.value)

      const nwState: Partial<TransactionState> = {
        viewType,
        selectedTransaction: transactionType
      }

      if (fields.Destination !== undefined) {
        nwState.selectedDestAccount = null
        fields.Destination = ''
      } else {
        fields.Destination = undefined
      }

      if (transactionType?.value && transactionFlags[transactionType?.value] && fields.Flags) {
        nwState.selectedFlags = extractFlags(transactionType.value, fields.Flags)
        fields.Flags = undefined
      }

      nwState.txFields = fields
      const state = modifyTxState(header, nwState, { replaceState: true })
      const editorValue = getJsonString(state)
      return setState({ editorValue })
    },
    [getJsonString, header, setState, viewType]
  )

  const estimateFee = useCallback(
    async (st?: TransactionState, opts?: { silent?: boolean }) => {
      const state = st || txState
      const ptx = prepareOptions(state)
      const account = accounts.find(acc => acc.address === state.selectedAccount?.value)
      if (!account) {
        if (!opts?.silent) {
          toast.error('Please select account from the list.')
        }
        return
      }

      ptx.Account = account.address
      ptx.Sequence = account.sequence

      const res = await _estimateFee(ptx, account, opts)
      const fee = res?.base_fee
      setState({ estimatedFee: fee })
      return fee
    },
    [accounts, prepareOptions, setState, txState]
  )

  return (
    <Box css={{ position: 'relative', height: 'calc(100% - 28px)' }} {...props}>
      {viewType === 'json' ? (
        <TxJson
          getJsonString={getJsonString}
          header={header}
          state={txState}
          setState={setState}
          estimateFee={estimateFee}
        />
      ) : (
        <TxUI
          state={txState}
          resetState={resetState}
          setState={setState}
          estimateFee={estimateFee}
        />
      )}
      <Flex
        row
        css={{
          justifyContent: 'space-between',
          position: 'absolute',
          left: 0,
          bottom: 0,
          width: '100%',
          mb: '$1'
        }}
      >
        <Button
          onClick={() => {
            if (viewType === 'ui') {
              setState({ viewType: 'json' })
            } else setState({ viewType: 'ui' })
          }}
          outline
        >
          {viewType === 'ui' ? 'EDIT AS JSON' : 'EXIT JSON MODE'}
        </Button>
        <Flex row>
          <Button onClick={() => resetState()} outline css={{ mr: '$3' }}>
            RESET
          </Button>
          <Button
            variant="primary"
            onClick={submitTest}
            isLoading={txIsLoading}
            disabled={txIsDisabled}
          >
            <Play weight="bold" size="16px" />
            RUN TEST
          </Button>
        </Flex>
      </Flex>
    </Box>
  )
}

export default Transaction