# All files / src/middleware events.coffee

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     moment = require 'moment'
    logger = require 'winston'
    events = require '../model/events'
    messageStore = require '../middleware/messageStore'
    config = require '../config/config'
    config.events = config.get('events')

    if !config.events
      # maybe we're using outdated config
      config.events = config.get('visualizer')
      config.events.normalizationBuffer = config.events.orchestrationTsBufferMillis

    enableTSNormalization = config.events.enableTSNormalization ? false
    if enableTSNormalization is true
      normalizationBuffer = 100
    else
      normalizationBuffer = 0

    timestampAsMillis = (ts) -> moment(new Date(ts)).valueOf()

    # Determine the difference between baseTS and the earliest timestamp
    # present in a collection of routes (buffered for normalization)
    calculateEarliestRouteDiff = (baseTS, routes) ->
      earliestTS = 0

      for route in routes
        ts = timestampAsMillis route.request.timestamp
        if earliestTS < ts then earliestTS = ts

      tsDiff = baseTS - earliestTS
      tsDiff += normalizationBuffer

      return tsDiff

    determineStatusType = (statusCode) ->
      status = 'success'
      if 500 <= statusCode <= 599
        status = 'error'
      return status

    exports.saveEvents = saveEvents = (trxEvents, callback) ->
      now = new Date
      event.created = now for event in trxEvents

      # bypass mongoose for quick batch inserts
      # index needs to be ensured manually since the collection might not already exist
      events.Event.collection.ensureIndex { created: 1 }, { expireAfterSeconds: 3600 }, ->
        events.Event.collection.insert trxEvents, (err) -> return if err then callback err else callback()

    createRouteEvents = (dst, transactionId, channel, route, type, tsAdjustment, autoRetryAttempt) ->
      if route?.request?.timestamp? and route?.response?.timestamp?
        startTS = timestampAsMillis route.request.timestamp
        endTS = timestampAsMillis route.response.timestamp

        if enableTSNormalization is true
          startTS = startTS + tsAdjustment
          endTS = endTS + tsAdjustment

        if startTS > endTS then startTS = endTS

        dst.push
          channelID: channel._id
          transactionID: transactionId
          normalizedTimestamp: startTS
          type: type
          event: 'start'
          name: route.name
          mediator: route.mediatorURN
          autoRetryAttempt: autoRetryAttempt

        dst.push
          channelID: channel._id
          transactionID: transactionId
          normalizedTimestamp: endTS
          type: type
          event: 'end'
          name: route.name
          mediator: route.mediatorURN
          status: route.response.status
          statusType: determineStatusType route.response.status
          autoRetryAttempt: autoRetryAttempt

    createChannelStartEvent = (dst, transactionId, requestTimestamp, channel, autoRetryAttempt) ->
      dst.push
        channelID: channel._id
        transactionID: transactionId
        normalizedTimestamp: timestampAsMillis requestTimestamp
        type: 'channel'
        event: 'start'
        name: channel.name
        autoRetryAttempt: autoRetryAttempt

    createChannelEndEvent = (dst, transactionId, requestTimestamp, channel, response, autoRetryAttempt) ->
      startTS = timestampAsMillis requestTimestamp

      endTS = timestampAsMillis response.timestamp
      if endTS < startTS then endTS = startTS

      dst.push
        channelID: channel._id
        transactionID: transactionId
        normalizedTimestamp: endTS + normalizationBuffer
        type: 'channel'
        event: 'end'
        name: channel.name
        status: response.status
        statusType: determineStatusType response.status
        autoRetryAttempt: autoRetryAttempt

    createPrimaryRouteEvents = (dst, transactionId, requestTimestamp, channel, routeName, mediatorURN, response, autoRetryAttempt) ->
      startTS = timestampAsMillis requestTimestamp

      dst.push
        channelID: channel._id
        transactionID: transactionId
        normalizedTimestamp: startTS
        type: 'primary'
        event: 'start'
        name: routeName
        mediator: mediatorURN
        autoRetryAttempt: autoRetryAttempt

      endTS = timestampAsMillis response.timestamp
      if endTS < startTS then endTS = startTS

      dst.push
        channelID: channel._id
        transactionID: transactionId
        normalizedTimestamp: endTS + normalizationBuffer
        type: 'primary'
        event: 'end'
        name: routeName
        status: response.status
        statusType: determineStatusType response.status
        mediator: mediatorURN
        autoRetryAttempt: autoRetryAttempt

    createOrchestrationEvents = (dst, transactionId, requestTimestamp, channel, orchestrations) ->
      if requestTimestamp
        startTS = timestampAsMillis requestTimestamp
        tsDiff = calculateEarliestRouteDiff startTS, orchestrations

      createRouteEvents dst, transactionId, channel, orch, 'orchestration', tsDiff for orch in orchestrations

    exports.createSecondaryRouteEvents = createSecondaryRouteEvents = (dst, transactionId, requestTimestamp, channel, routes) ->
      startTS = timestampAsMillis requestTimestamp
      tsDiff = calculateEarliestRouteDiff startTS, routes

      for route in routes
        createRouteEvents dst, transactionId, channel, route, 'route', tsDiff

        if route.orchestrations
          # find TS difference
          tsDiff = calculateEarliestRouteDiff startTS, route.orchestrations
          createRouteEvents dst, transactionId, channel, orch, 'orchestration', tsDiff for orch in route.orchestrations

    exports.createTransactionEvents = (dst, transaction, channel) ->
      getPrimaryRouteName = () ->
        for r in channel.routes
          if r.primary then return r.name
        return null

      timestamp = if transaction.request?.timestamp then transaction.request.timestamp else new Date()

      if transaction.request and transaction.response
        createPrimaryRouteEvents dst, transaction._id, timestamp, channel, getPrimaryRouteName(), null, transaction.response
      if transaction.orchestrations
        createOrchestrationEvents dst, transaction._id, timestamp, channel, transaction.orchestrations
      if transaction.routes
        createSecondaryRouteEvents dst, transaction._id, timestamp, channel, transaction.routes

    exports.koaMiddleware = (next) ->
      ctx = this

      runAsync = (method) ->
        do (ctx) ->
          f = -> method ctx, (err) -> logger.err err if err
          setTimeout f, 0

      runAsync (ctx, done) ->
        logger.debug "Storing channel start event for transaction: #{ctx.transactionId}"
        trxEvents = []
        createChannelStartEvent trxEvents, ctx.transactionId, ctx.requestTimestamp, ctx.authorisedChannel, ctx.currentAttempt
        saveEvents trxEvents, done

      yield next

      runAsync (ctx, done) ->
        logger.debug "Storing channel end and primary routes events for transaction: #{ctx.transactionId}"

        trxEvents = []

        mediatorURN = ctx.mediatorResponse?['x-mediator-urn']
        orchestrations = ctx.mediatorResponse?.orchestrations

        createPrimaryRouteEvents trxEvents, ctx.transactionId, ctx.requestTimestamp, ctx.authorisedChannel, ctx.primaryRoute.name, mediatorURN, ctx.response, ctx.currentAttempt
        if orchestrations
          createOrchestrationEvents trxEvents, ctx.transactionId, ctx.requestTimestamp, ctx.authorisedChannel, orchestrations, ctx.currentAttempt
        createChannelEndEvent trxEvents, ctx.transactionId, ctx.requestTimestamp, ctx.authorisedChannel, ctx.response, ctx.currentAttempt
        saveEvents trxEvents, done