import * as _ from 'lodash'
import * as utils from './utils'
import parseTransaction from './parse/transaction'
import {validate, errors} from '../common'
import {Connection} from '../common'
import {FormattedTransactionType} from '../transaction/types'
import {RippledError} from '../common/errors'
import {RippleAPI} from '..'

export type TransactionOptions = {
  minLedgerVersion?: number,
  maxLedgerVersion?: number,
  includeRawTransaction?: boolean
}
type TransactionResponse = FormattedTransactionType & {
    hash: string,
    ledger_index: number,
    meta: any,
    validated?: boolean
}


function attachTransactionDate(connection: Connection, tx: any
): Promise<TransactionResponse> {
  if (tx.date) {
    return Promise.resolve(tx)
  }

  const ledgerVersion = tx.ledger_index || tx.LedgerSequence

  if (!ledgerVersion) {
    return new Promise(() => {
      throw new errors.NotFoundError(
        'ledger_index and LedgerSequence not found in tx')
    })
  }

  const request = {
    command: 'ledger',
    ledger_index: ledgerVersion
  }

  return connection.request(request).then(data => {
    if (typeof data.ledger.close_time === 'number') {
      return _.assign({date: data.ledger.close_time}, tx)
    }
    throw new errors.UnexpectedError('Ledger missing close_time')
  }).catch(error => {
    if (error instanceof errors.UnexpectedError) {
      throw error
    }
    throw new errors.NotFoundError('Transaction ledger not found')
  })
}

function isTransactionInRange(tx: any, options: TransactionOptions) {
  return (!options.minLedgerVersion
          || tx.ledger_index >= options.minLedgerVersion)
      && (!options.maxLedgerVersion
          || tx.ledger_index <= options.maxLedgerVersion)
}

function convertError(connection: Connection, options: TransactionOptions,
  error: RippledError
): Promise<Error> {
  let shouldUseNotFoundError = false
  if ((error.data && error.data.error === 'txnNotFound') || error.message === 'txnNotFound') {
    shouldUseNotFoundError = true
  }

  // In the future, we should deprecate this error, instead passing through the one from rippled.
  const _error = shouldUseNotFoundError ? new errors.NotFoundError('Transaction not found') : error

  if (_error instanceof errors.NotFoundError) {
    return utils.hasCompleteLedgerRange(connection, options.minLedgerVersion,
      options.maxLedgerVersion).then(hasCompleteLedgerRange => {
      if (!hasCompleteLedgerRange) {
        return utils.isPendingLedgerVersion(
          connection, options.maxLedgerVersion)
          .then(isPendingLedgerVersion => {
            return isPendingLedgerVersion ?
              new errors.PendingLedgerVersionError() :
              new errors.MissingLedgerHistoryError()
          })
      }
      return _error
    })
  }
  return Promise.resolve(_error)
}

function formatResponse(options: TransactionOptions, tx: TransactionResponse
): FormattedTransactionType {
  if (tx.validated !== true || !isTransactionInRange(tx, options)) {
    throw new errors.NotFoundError('Transaction not found')
  }
  return parseTransaction(tx, options.includeRawTransaction)
}

async function getTransaction(this: RippleAPI, id: string, options: TransactionOptions = {}
): Promise<FormattedTransactionType> {
  validate.getTransaction({id, options})
  const _options = await utils.ensureLedgerVersion.call(this, options)
  try {
    const tx = await this.request('tx', {
      transaction: id,
      binary: false
    })
    const txWithDate = await attachTransactionDate(this.connection, tx)
    return formatResponse(_options, txWithDate)
  } catch (error) {
    throw (await convertError(this.connection, _options, error))
  }
}

export default getTransaction