codecombat/app/lib/simulator/Simulator.coffee

SuperModel = require 'models/SuperModel'
CocoClass = require 'core/CocoClass'
LevelLoader = require 'lib/LevelLoader'
GoalManager = require 'lib/world/GoalManager'
God = require 'lib/God'
{createAetherOptions} = require 'lib/aether_utils'

SIMULATOR_VERSION = 4

simulatorInfo = {}
if $.browser
  simulatorInfo['desktop'] = $.browser.desktop if $.browser.desktop
  simulatorInfo['name'] = $.browser.name if $.browser.name
  simulatorInfo['platform'] = $.browser.platform if $.browser.platform
  simulatorInfo['version'] = $.browser.versionNumber if $.browser.versionNumber

module.exports = class Simulator extends CocoClass
  constructor: (@options) ->
    @options ?= {}
    simulatorType = if @options.headlessClient then 'headless' else 'browser'
    @simulator =
      type: simulatorType
      version: SIMULATOR_VERSION
      info: simulatorInfo
    _.extend @, Backbone.Events
    @trigger 'statusUpdate', 'Starting simulation!'
    @retryDelayInSeconds = 2
    @taskURL = '/queue/scoring'
    @simulatedByYou = 0
    @god = new God maxAngels: 1, workerCode: @options.workerCode, headless: true  # Start loading worker.

  destroy: ->
    @off()
    @cleanupSimulation()
    @god?.destroy()
    super()

  fetchAndSimulateOneGame: (humanGameID, ogresGameID) =>
    return if @destroyed
    $.ajax
      url: '/queue/scoring/getTwoGames'
      type: 'POST'
      parse: true
      data:
        humansGameID: humanGameID
        ogresGameID: ogresGameID
        simulator: @simulator
        background: Boolean(@options.background)
        levelID: @options.levelID
        leagueID: @options.leagueID
      error: (errorData) ->
        console.warn "There was an error fetching two games! #{JSON.stringify errorData}"
        if errorData?.responseText?.indexOf("Old simulator") isnt -1
          noty {
            text: errorData.responseText
            layout: 'center'
            type: 'error'
          }
      success: (taskData) =>
        return if @destroyed
        unless taskData
          @retryDelayInSeconds = 10
          @trigger 'statusUpdate', "No games to simulate. Trying another game in #{@retryDelayInSeconds} seconds."
          @simulateAnotherTaskAfterDelay()
          return
        @trigger 'statusUpdate', 'Setting up simulation...'
        #refactor this
        @task = new SimulationTask(taskData)

        @supermodel ?= new SuperModel()
        @supermodel.resetProgress()
        @stopListening @supermodel, 'loaded-all'
        @levelLoader = new LevelLoader supermodel: @supermodel, levelID: @task.getLevelName(), sessionID: @task.getFirstSessionID(), opponentSessionID: @task.getSecondSessionID(), headless: true

        if @supermodel.finished()
          @simulateSingleGame()
        else
          @listenToOnce @supermodel, 'loaded-all', @simulateSingleGame

  simulateSingleGame: ->
    return if @destroyed
    @assignWorldAndLevelFromLevelLoaderAndDestroyIt()
    @trigger 'statusUpdate', 'Simulating...'
    @setupGod()
    try
      @commenceSingleSimulation()
    catch error
      @handleSingleSimulationError error

  commenceSingleSimulation: ->
    @listenToOnce @god, 'infinite-loop', @handleSingleSimulationInfiniteLoop
    @listenToOnce @god, 'goals-calculated', @processSingleGameResults
    @god.createWorld @generateSpellsObject()

  handleSingleSimulationError: (error) ->
    console.error 'There was an error simulating a single game!', error
    return if @destroyed
    if @options.headlessClient and @options.simulateOnlyOneGame
      console.log 'GAMERESULT:tie'
      process.exit(0)
    @cleanupAndSimulateAnotherTask()

  handleSingleSimulationInfiniteLoop: (e) ->
    console.log 'There was an infinite loop in the single game!'
    return if @destroyed
    if @options.headlessClient and @options.simulateOnlyOneGame
      console.log 'GAMERESULT:tie'
      process.exit(0)
    @cleanupAndSimulateAnotherTask()

  processSingleGameResults: (simulationResults) ->
    try
      taskResults = @formTaskResultsObject simulationResults
    catch error
      console.log "Failed to form task results:", error
      return @cleanupAndSimulateAnotherTask()
    console.log 'Processing results:', taskResults
    humanSessionRank = taskResults.sessions[0].metrics.rank
    ogreSessionRank = taskResults.sessions[1].metrics.rank
    if @options.headlessClient and @options.simulateOnlyOneGame
      if humanSessionRank is ogreSessionRank
        console.log 'GAMERESULT:tie'
      else if humanSessionRank < ogreSessionRank
        console.log 'GAMERESULT:humans'
      else if ogreSessionRank < humanSessionRank
        console.log 'GAMERESULT:ogres'
      process.exit(0)
    else
      @sendSingleGameBackToServer(taskResults)

  sendSingleGameBackToServer: (results) ->
    @trigger 'statusUpdate', 'Simulation completed, sending results back to server!'

    $.ajax
      url: '/queue/scoring/recordTwoGames'
      data: results
      type: 'PUT'
      parse: true
      success: @handleTaskResultsTransferSuccess
      error: @handleTaskResultsTransferError
      complete: @cleanupAndSimulateAnotherTask

  fetchAndSimulateTask: =>
    return if @destroyed
    # Because there's some bug where the chained rankings don't work, let's just do getTwoGames until we fix it.
    return @fetchAndSimulateOneGame()

    if @options.headlessClient
      if @dumpThisTime # The first heapdump would be useless to find leaks.
        console.log 'Writing snapshot.'
        @options.heapdump.writeSnapshot()
      @dumpThisTime = true if @options.heapdump

      if @options.testing
        _.delay @setupSimulationAndLoadLevel, 0, @options.testFile, 'Testing...', status: 400
        return

    @trigger 'statusUpdate', 'Fetching simulation data!'
    $.ajax
      url: @taskURL
      type: 'GET'
      parse: true
      error: @handleFetchTaskError
      success: @setupSimulationAndLoadLevel
      cache: false

  handleFetchTaskError: (errorData) =>
    console.error "There was a horrible Error: #{JSON.stringify errorData}"
    @trigger 'statusUpdate', 'There was an error fetching games to simulate. Retrying in 10 seconds.'
    @simulateAnotherTaskAfterDelay()

  handleNoGamesResponse: ->
    @noTasks = true
    info = 'Finding game to simulate...'
    console.log info
    @trigger 'statusUpdate', info
    @fetchAndSimulateOneGame()

  simulateAnotherTaskAfterDelay: =>
    console.log "Retrying in #{@retryDelayInSeconds}"
    retryDelayInMilliseconds = @retryDelayInSeconds * 1000
    _.delay @fetchAndSimulateTask, retryDelayInMilliseconds

  setupSimulationAndLoadLevel: (taskData, textStatus, jqXHR) =>
    return @handleNoGamesResponse() if jqXHR.status is 204
    @trigger 'statusUpdate', 'Setting up simulation!'
    @task = new SimulationTask(taskData)
    try
      levelID = @task.getLevelName()
    catch err
      console.error err
      @trigger 'statusUpdate', "Error simulating game: #{err}. Trying another game in #{@retryDelayInSeconds} seconds."
      @simulateAnotherTaskAfterDelay()
      return

    @supermodel ?= new SuperModel()
    @supermodel.resetProgress()
    @stopListening @supermodel, 'loaded-all'
    @levelLoader = new LevelLoader supermodel: @supermodel, levelID: levelID, sessionID: @task.getFirstSessionID(), opponentSessionID: @task.getSecondSessionID(), headless: true
    if @supermodel.finished()
      @simulateGame()
    else
      @listenToOnce @supermodel, 'loaded-all', @simulateGame

  simulateGame: ->
    return if @destroyed
    info = 'All resources loaded, simulating!'
    console.log info
    @assignWorldAndLevelFromLevelLoaderAndDestroyIt()
    @trigger 'statusUpdate', info, @task.getSessions()
    @setupGod()

    try
      @commenceSimulationAndSetupCallback()
    catch err
      console.error 'There was an error in simulation:', err, err.stack, "-- trying again in #{@retryDelayInSeconds} seconds"
      @simulateAnotherTaskAfterDelay()

  assignWorldAndLevelFromLevelLoaderAndDestroyIt: ->
    @world = @levelLoader.world
    @task.setWorld(@world)
    @level = @levelLoader.level
    @session = @levelLoader.session
    @otherSession = @levelLoader.opponentSession
    @levelLoader.destroy()
    @levelLoader = null

  setupGod: ->
    @god.setLevel @level.serialize(@supermodel, @session, @otherSession)
    @god.setLevelSessionIDs (session.sessionID for session in @task.getSessions())
    @god.setWorldClassMap @world.classMap
    @god.setGoalManager new GoalManager @world, @level.get('goals'), null, {headless: true}
    humanFlagHistory = _.filter @session.get('state')?.flagHistory ? [], (event) => event.source isnt 'code' and event.team is (@session.get('team') ? 'humans')
    ogreFlagHistory = _.filter @otherSession.get('state')?.flagHistory ? [], (event) => event.source isnt 'code' and event.team is (@otherSession.get('team') ? 'ogres')
    @god.lastFlagHistory = humanFlagHistory.concat ogreFlagHistory
    #console.log 'got flag history', @god.lastFlagHistory, 'from', humanFlagHistory, ogreFlagHistory, @session.get('state'), @otherSession.get('state')
    @god.lastSubmissionCount = 0  # TODO: figure out how to combine submissionCounts from both players so we can use submissionCount random seeds again.
    @god.lastDifficulty = 0

  commenceSimulationAndSetupCallback: ->
    @listenToOnce @god, 'infinite-loop', @onInfiniteLoop
    @listenToOnce @god, 'goals-calculated', @processResults
    @god.createWorld @generateSpellsObject()

    # Search for leaks, headless-client only.
    if @options.headlessClient and @options.leakTest and not @memwatch?
      leakcount = 0
      maxleakcount = 0
      console.log 'Setting leak callbacks.'
      @memwatch = require 'memwatch'

      @memwatch.on 'leak', (info) =>
        console.warn "LEAK!!\n" + JSON.stringify(info)

        unless @hd?
          if (leakcount++ is maxleakcount)
            @hd = new @memwatch.HeapDiff()

            @memwatch.on 'stats', (stats) =>
              console.warn 'stats callback: ' + stats
              diff = @hd.end()
              console.warn "HeapDiff:\n" + JSON.stringify(diff)

              if @options.exitOnLeak
                console.warn 'Exiting because of Leak.'
                process.exit()
              @hd = new @memwatch.HeapDiff()

  onInfiniteLoop: (e) ->
    return if @destroyed
    console.warn 'Skipping infinitely looping game.'
    @trigger 'statusUpdate', "Infinite loop detected; grabbing a new game in #{@retryDelayInSeconds} seconds."
    _.delay @cleanupAndSimulateAnotherTask, @retryDelayInSeconds * 1000

  processResults: (simulationResults) ->
    try
      taskResults = @formTaskResultsObject simulationResults
    catch error
      console.log "Failed to form task results:", error
      return @cleanupAndSimulateAnotherTask()
    unless taskResults.taskID
      console.error "*** Error: taskResults has no taskID ***\ntaskResults:", taskResults
      @cleanupAndSimulateAnotherTask()
    else
      @sendResultsBackToServer taskResults

  sendResultsBackToServer: (results) ->
    status = 'Recording:'
    for session in results.sessions
      states = ['wins', if _.find(results.sessions, (s) -> s.metrics.rank is 0) then 'loses' else 'draws']
      status += " #{session.name} #{states[session.metrics.rank]}"
    @trigger 'statusUpdate', status
    console.log 'Sending result back to server:'
    console.log JSON.stringify results

    if @options.headlessClient and @options.testing
      return @fetchAndSimulateTask()

    $.ajax
      url: '/queue/scoring'
      data: results
      type: 'PUT'
      parse: true
      success: @handleTaskResultsTransferSuccess
      error: @handleTaskResultsTransferError
      complete: @cleanupAndSimulateAnotherTask

  handleTaskResultsTransferSuccess: (result) =>
    return if @destroyed
    console.log "Task registration result: #{JSON.stringify result}"
    @trigger 'statusUpdate', 'Results were successfully sent back to server!'
    @simulatedByYou++
    unless @options.headlessClient
      simulatedBy = parseInt($('#simulated-by-you').text(), 10) + 1
      $('#simulated-by-you').text(simulatedBy)

  handleTaskResultsTransferError: (error) =>
    return if @destroyed
    @trigger 'statusUpdate', 'There was an error sending the results back to the server.'
    console.log "Task registration error: #{JSON.stringify error}"

  cleanupAndSimulateAnotherTask: =>
    return if @destroyed
    @cleanupSimulation()
    if @options.background or @noTasks
      @fetchAndSimulateOneGame()
    else
      @fetchAndSimulateTask()

  cleanupSimulation: ->
    @stopListening @god
    @world = null
    @level = null

  formTaskResultsObject: (simulationResults) ->
    taskResults =
      taskID: @task.getTaskID()
      receiptHandle: @task.getReceiptHandle()
      originalSessionID: @task.getFirstSessionID()
      originalSessionRank: -1
      calculationTime: 500
      sessions: []
      simulator: @simulator
      randomSeed: @task.world.randomSeed

    for session in @task.getSessions()
      sessionResult =
        sessionID: session.sessionID
        submitDate: session.submitDate
        creator: session.creator
        name: session.creatorName
        totalScore: session.totalScore
        metrics:
          rank: @calculateSessionRank session.sessionID, simulationResults.goalStates, @task.generateTeamToSessionMap()
        shouldUpdateLastOpponentSubmitDateForLeague: session.shouldUpdateLastOpponentSubmitDateForLeague
      if session.sessionID is taskResults.originalSessionID
        taskResults.originalSessionRank = sessionResult.metrics.rank
        taskResults.originalSessionTeam = session.team
      taskResults.sessions.push sessionResult

    return taskResults

  calculateSessionRank: (sessionID, goalStates, teamSessionMap) ->
    ogreGoals = (goalState for key, goalState of goalStates when goalState.team is 'ogres')
    humanGoals = (goalState for key, goalState of goalStates when goalState.team is 'humans')
    ogresWon = _.all ogreGoals, {status: 'success'}
    humansWon = _.all humanGoals, {status: 'success'}
    if ogresWon is humansWon
      return 0
    else if ogresWon and teamSessionMap['ogres'] is sessionID
      return 0
    else if ogresWon and teamSessionMap['ogres'] isnt sessionID
      return 1
    else if humansWon and teamSessionMap['humans'] is sessionID
      return 0
    else
      return 1

  generateSpellsObject: ->
    @currentUserCodeMap = @task.generateSpellKeyToSourceMap()
    @spells = {}
    for thang in @level.attributes.thangs
      continue if @thangIsATemplate thang
      @generateSpellKeyToSourceMapPropertiesFromThang thang
    @spells

  thangIsATemplate: (thang) ->
    for component in thang.components
      continue unless @componentHasProgrammableMethods component
      for methodName, method of component.config.programmableMethods
        return true if @methodBelongsToTemplateThang method

    return false

  componentHasProgrammableMethods: (component) -> component.config? and _.has component.config, 'programmableMethods'

  methodBelongsToTemplateThang: (method) -> typeof method is 'string'

  generateSpellKeyToSourceMapPropertiesFromThang: (thang) =>
    for component in thang.components
      continue unless @componentHasProgrammableMethods component
      for methodName, method of component.config.programmableMethods
        spellKey = @generateSpellKeyFromThangIDAndMethodName thang.id, methodName

        @createSpellAndAssignName spellKey, methodName
        @createSpellThang thang, method, spellKey
        @transpileSpell thang, spellKey, methodName

  generateSpellKeyFromThangIDAndMethodName: (thang, methodName) ->
    spellKeyComponents = [thang, methodName]
    spellKeyComponents[0] = _.string.slugify spellKeyComponents[0]
    spellKey = spellKeyComponents.join '/'
    spellKey

  createSpellAndAssignName: (spellKey, spellName) ->
    @spells[spellKey] ?= {}
    @spells[spellKey].name = spellName

  createSpellThang: (thang, method, spellKey) ->
    @spells[spellKey].thangs ?= {}
    @spells[spellKey].thangs[thang.id] ?= {}
    spellTeam = @task.getSpellKeyToTeamMap()[spellKey]
    playerTeams = @task.getPlayerTeams()
    useProtectAPI = true
    if spellTeam not in playerTeams
      useProtectAPI = false
    else
      spellSession = _.filter(@task.getSessions(), {team: spellTeam})[0]
      unless codeLanguage = spellSession?.submittedCodeLanguage
        console.warn 'Session', spellSession.creatorName, spellSession.team, 'didn\'t have submittedCodeLanguage, just:', spellSession
    @spells[spellKey].thangs[thang.id].aether = @createAether @spells[spellKey].name, method, useProtectAPI, codeLanguage ? 'javascript'

  transpileSpell: (thang, spellKey, methodName) ->
    slugifiedThangID = _.string.slugify thang.id
    generatedSpellKey = [slugifiedThangID,methodName].join '/'
    source = @currentUserCodeMap[generatedSpellKey] ? ''
    aether = @spells[spellKey].thangs[thang.id].aether
    #unless _.contains(@task.spellKeysToTranspile, generatedSpellKey)
    try
      aether.transpile source
    catch e
      console.log "Couldn't transpile #{spellKey}:\n#{source}\n", e
      aether.transpile ''

  createAether: (methodName, method, useProtectAPI, codeLanguage) ->
    aetherOptions = createAetherOptions functionName: methodName, codeLanguage: codeLanguage, skipProtectAPI: not useProtectAPI
    return new Aether aetherOptions

class SimulationTask
  constructor: (@rawData) ->
    @spellKeyToTeamMap = {}

  getLevelName: ->
    levelName = @rawData.sessions?[0]?.levelID
    return levelName if levelName?
    @throwMalformedTaskError 'The level name couldn\'t be deduced from the task.'

  generateTeamToSessionMap: ->
    teamSessionMap = {}
    for session in @rawData.sessions
      @throwMalformedTaskError 'Two players share the same team' if teamSessionMap[session.team]?
      teamSessionMap[session.team] = session.sessionID

    teamSessionMap

  throwMalformedTaskError: (errorString) ->
    throw new Error "The task was malformed, reason: #{errorString}"

  getFirstSessionID: -> @rawData.sessions[0].sessionID

  getSecondSessionID: -> @rawData.sessions[1].sessionID

  getTaskID: -> @rawData.taskID

  getReceiptHandle: -> @rawData.receiptHandle

  getSessions: -> @rawData.sessions

  getSpellKeyToTeamMap: -> @spellKeyToTeamMap

  getPlayerTeams: -> _.pluck @rawData.sessions, 'team'

  setWorld: (@world) ->

  generateSpellKeyToSourceMap: ->
    # TODO: we always now only have hero-placeholder/plan vs. hero-placeholder-1/plan on humans vs. ogres, always just have to retranspile for Esper, and never need to transpile for NPCs or other methods, so we can get rid of almost all of this stuff.
    playerTeams = _.pluck @rawData.sessions, 'team'
    spellKeyToSourceMap = {}
    for session in @rawData.sessions
      teamSpells = session.teamSpells[session.team]
      allTeams = _.keys session.teamSpells
      for team in allTeams
        for spell in session.teamSpells[team]
          @spellKeyToTeamMap[spell] = team
      teamCode = {}

      for thangName, thangSpells of session.submittedCode
        for spellName, spell of thangSpells
          fullSpellName = [thangName, spellName].join '/'
          if _.contains(teamSpells, fullSpellName)
            teamCode[fullSpellName] = LZString.decompressFromUTF16 spell

      _.merge spellKeyToSourceMap, teamCode

    spellKeyToSourceMap