import { proxy } from 'valtio'
import { deepEqual } from '../utils/object'
import transactionsData from '../content/transactions.json'
import state from '.'
import { showAlert } from '../state/actions/showAlert'
import { parseJSON } from '../utils/json'

export type SelectOption = {
  value: string
  label: string
}

export interface TransactionState {
  selectedTransaction: SelectOption | null
  selectedAccount: SelectOption | null
  selectedDestAccount: SelectOption | null
  txIsLoading: boolean
  txIsDisabled: boolean
  txFields: TxFields
  viewType: 'json' | 'ui'
  editorValue?: string
  estimatedFee?: string
}

export type TxFields = Omit<
  Partial<typeof transactionsData[0]>,
  'Account' | 'Sequence' | 'TransactionType'
>

export const defaultTransaction: TransactionState = {
  selectedTransaction: null,
  selectedAccount: null,
  selectedDestAccount: null,
  txIsLoading: false,
  txIsDisabled: false,
  txFields: {},
  viewType: 'ui'
}

export const transactionsState = proxy({
  transactions: [
    {
      header: 'test1.json',
      state: { ...defaultTransaction }
    }
  ],
  activeHeader: 'test1.json'
})

export const renameTxState = (oldName: string, nwName: string) => {
  const tx = transactionsState.transactions.find(tx => tx.header === oldName)

  if (!tx) throw Error(`No transaction state exists with given header name ${oldName}`)

  tx.header = nwName
}

/**
 * Simple transaction state changer
 * @param header Unique key and tab name for the transaction tab
 * @param partialTx partial transaction state, `undefined` deletes the transaction
 *
 */
export const modifyTxState = (
  header: string,
  partialTx?: Partial<TransactionState>,
  opts: { replaceState?: boolean } = {}
) => {
  const tx = transactionsState.transactions.find(tx => tx.header === header)

  if (partialTx === undefined) {
    transactionsState.transactions = transactionsState.transactions.filter(
      tx => tx.header !== header
    )
    return
  }

  if (!tx) {
    const state = {
      ...defaultTransaction,
      ...partialTx
    }
    transactionsState.transactions.push({
      header,
      state
    })
    return state
  }

  if (opts.replaceState) {
    const repTx: TransactionState = {
      ...defaultTransaction,
      ...partialTx
    }
    tx.state = repTx
    return repTx
  }

  Object.keys(partialTx).forEach(k => {
    // Typescript mess here, but is definitely safe!
    const s = tx.state as any
    const p = partialTx as any // ? Make copy
    if (!deepEqual(s[k], p[k])) s[k] = p[k]
  })

  return tx.state
}

// state to tx options
export const prepareTransaction = (data: any) => {
  let options = { ...data }

  Object.keys(options).forEach(field => {
    let _value = options[field]
    // convert xrp
    if (_value && typeof _value === 'object' && _value.$type === 'xrp') {
      if (+_value.$value) {
        options[field] = (+_value.$value * 1000000 + '') as any
      } else {
        options[field] = undefined // 👇 💀
      }
    }
    // handle type: `json`
    if (_value && typeof _value === 'object' && _value.$type === 'json') {
      if (typeof _value.$value === 'object') {
        options[field] = _value.$value
      } else {
        try {
          options[field] = JSON.parse(_value.$value)
        } catch (error) {
          const message = `Input error for json field '${field}': ${
            error instanceof Error ? error.message : ''
          }`
          console.error(message)
          options[field] = _value.$value
        }
      }
    }

    // delete unnecessary fields
    if (!options[field]) {
      delete options[field]
    }
  })

  return options
}

// editor value to state
export const prepareState = (value: string, transactionType?: string) => {
  const options = parseJSON(value)
  if (!options) {
    showAlert('Error!', {
      body: 'Cannot save editor with malformed transaction.'
    })
    return
  }

  const { Account, TransactionType, Destination, ...rest } = options
  let tx: Partial<TransactionState> = {}
  const schema = getTxFields(transactionType)

  if (Account) {
    const acc = state.accounts.find(acc => acc.address === Account)
    if (acc) {
      tx.selectedAccount = {
        label: acc.name,
        value: acc.address
      }
    } else {
      tx.selectedAccount = {
        label: Account,
        value: Account
      }
    }
  } else {
    tx.selectedAccount = null
  }

  if (TransactionType) {
    tx.selectedTransaction = {
      label: TransactionType,
      value: TransactionType
    }
  } else {
    tx.selectedTransaction = null
  }

  if (schema.Destination !== undefined) {
    const dest = state.accounts.find(acc => acc.address === Destination)
    if (dest) {
      tx.selectedDestAccount = {
        label: dest.name,
        value: dest.address
      }
    } else if (Destination) {
      tx.selectedDestAccount = {
        label: Destination,
        value: Destination
      }
    } else {
      tx.selectedDestAccount = null
    }
  } else if (Destination) {
    rest.Destination = Destination
  }

  Object.keys(rest).forEach(field => {
    const value = rest[field]
    const schemaVal = schema[field as keyof TxFields]
    const isXrp =
      typeof value !== 'object' &&
      schemaVal &&
      typeof schemaVal === 'object' &&
      schemaVal.$type === 'xrp'
    if (isXrp) {
      rest[field] = {
        $type: 'xrp',
        $value: +value / 1000000 // ! maybe use bigint?
      }
    } else if (typeof value === 'object') {
      rest[field] = {
        $type: 'json',
        $value: value
      }
    }
  })

  tx.txFields = rest

  return tx
}

export const getTxFields = (tt?: string) => {
  const txFields: TxFields | undefined = transactionsData.find(tx => tx.TransactionType === tt)

  if (!txFields) return {}

  let _txFields = Object.keys(txFields)
    .filter(key => !['TransactionType', 'Account', 'Sequence'].includes(key))
    .reduce<TxFields>((tf, key) => ((tf[key as keyof TxFields] = (txFields as any)[key]), tf), {})
  return _txFields
}

export { transactionsData }

export const transactionsOptions = transactionsData.map(tx => ({
  value: tx.TransactionType,
  label: tx.TransactionType
}))

export const defaultTransactionType = transactionsOptions.find(tt => tt.value === 'Payment')