import * as Sentry from '@sentry/browser'
import { Dedupe, ExtraErrorData } from '@sentry/integrations'

import extractEthjsErrorMessage from './extractEthjsErrorMessage'

const METAMASK_DEBUG = process.env.METAMASK_DEBUG
const METAMASK_ENVIRONMENT = process.env.METAMASK_ENVIRONMENT
const SENTRY_DSN_DEV = 'https://f59f3dd640d2429d9d0e2445a87ea8e1@sentry.io/273496'

// This describes the subset of Redux state attached to errors sent to Sentry
// These properties have some potential to be useful for debugging, and they do
// not contain any identifiable information.
export const SENTRY_STATE = {
  gas: true,
  history: true,
  metamask: {
    alertEnabledness: true,
    completedOnboarding: true,
    connectedStatusPopoverHasBeenShown: true,
    conversionDate: true,
    conversionRate: true,
    currentBlockGasLimit: true,
    currentCurrency: true,
    currentLocale: true,
    customNonceValue: true,
    defaultHomeActiveTabName: true,
    featureFlags: true,
    firstTimeFlowType: true,
    forgottenPassword: true,
    incomingTxLastFetchedBlocksByNetwork: true,
    ipfsGateway: true,
    isAccountMenuOpen: true,
    isInitialized: true,
    isUnlocked: true,
    metaMetricsId: true,
    metaMetricsSendCount: true,
    nativeCurrency: true,
    network: true,
    nextNonce: true,
    participateInMetaMetrics: true,
    preferences: true,
    provider: {
      nickname: true,
      ticker: true,
      type: true,
    },
    seedPhraseBackedUp: true,
    settings: {
      chainId: true,
      ticker: true,
      nickname: true,
    },
    showRestorePrompt: true,
    threeBoxDisabled: true,
    threeBoxLastUpdated: true,
    threeBoxSynced: true,
    threeBoxSyncingAllowed: true,
    unapprovedDecryptMsgCount: true,
    unapprovedEncryptionPublicKeyMsgCount: true,
    unapprovedMsgCount: true,
    unapprovedPersonalMsgCount: true,
    unapprovedTypedMessagesCount: true,
    useBlockie: true,
    useNonceField: true,
    usePhishDetect: true,
    welcomeScreenSeen: true,
  },
  unconnectedAccount: true,
}

export default function setupSentry ({ release, getState }) {
  let sentryTarget

  if (METAMASK_DEBUG) {
    return undefined
  } else if (METAMASK_ENVIRONMENT === 'production') {
    if (!process.env.SENTRY_DSN) {
      throw new Error(`Missing SENTRY_DSN environment variable in production environment`)
    }
    console.log(`Setting up Sentry Remote Error Reporting for '${METAMASK_ENVIRONMENT}': SENTRY_DSN`)
    sentryTarget = process.env.SENTRY_DSN
  } else {
    console.log(`Setting up Sentry Remote Error Reporting for '${METAMASK_ENVIRONMENT}': SENTRY_DSN_DEV`)
    sentryTarget = SENTRY_DSN_DEV
  }

  Sentry.init({
    dsn: sentryTarget,
    debug: METAMASK_DEBUG,
    environment: METAMASK_ENVIRONMENT,
    integrations: [
      new Dedupe(),
      new ExtraErrorData(),
    ],
    release,
    beforeSend: (report) => rewriteReport(report),
  })

  function rewriteReport (report) {
    try {
      // simplify certain complex error messages (e.g. Ethjs)
      simplifyErrorMessages(report)
      // modify report urls
      rewriteReportUrls(report)
      // append app state
      if (getState) {
        const appState = getState()
        if (!report.extra) {
          report.extra = {}
        }
        report.extra.appState = appState
      }
    } catch (err) {
      console.warn(err)
    }
    return report
  }

  return Sentry
}

function simplifyErrorMessages (report) {
  rewriteErrorMessages(report, (errorMessage) => {
    // simplify ethjs error messages
    errorMessage = extractEthjsErrorMessage(errorMessage)
    // simplify 'Transaction Failed: known transaction'
    if (errorMessage.indexOf('Transaction Failed: known transaction') === 0) {
      // cut the hash from the error message
      errorMessage = 'Transaction Failed: known transaction'
    }
    return errorMessage
  })
}

function rewriteErrorMessages (report, rewriteFn) {
  // rewrite top level message
  if (typeof report.message === 'string') {
    report.message = rewriteFn(report.message)
  }
  // rewrite each exception message
  if (report.exception && report.exception.values) {
    report.exception.values.forEach((item) => {
      if (typeof item.value === 'string') {
        item.value = rewriteFn(item.value)
      }
    })
  }
}

function rewriteReportUrls (report) {
  // update request url
  report.request.url = toMetamaskUrl(report.request.url)
  // update exception stack trace
  if (report.exception && report.exception.values) {
    report.exception.values.forEach((item) => {
      if (item.stacktrace) {
        item.stacktrace.frames.forEach((frame) => {
          frame.filename = toMetamaskUrl(frame.filename)
        })
      }
    })
  }
}

function toMetamaskUrl (origUrl) {
  const filePath = origUrl.split(window.location.origin)[1]
  if (!filePath) {
    return origUrl
  }
  const metamaskUrl = `metamask${filePath}`
  return metamaskUrl
}