# grading.py
# ----------
# Licensing Information:  You are free to use or extend these projects for
# educational purposes provided that (1) you do not distribute or publish
# solutions, (2) you retain this notice, and (3) you provide clear
# attribution to UC Berkeley, including a link to http://ai.berkeley.edu.
# 
# Attribution Information: The Pacman AI projects were developed at UC Berkeley.
# The core projects and autograders were primarily created by John DeNero
# (denero@cs.berkeley.edu) and Dan Klein (klein@cs.berkeley.edu).
# Student side autograding was added by Brad Miller, Nick Hay, and
# Pieter Abbeel (pabbeel@cs.berkeley.edu).


"Common code for autograders"

import cgi
import time
import sys
import traceback
import pdb
from collections import defaultdict
import util

class Grades:
  "A data structure for project grades, along with formatting code to display them"
  def __init__(self, projectName, questionsAndMaxesList, edxOutput=False, muteOutput=False):
    """
    Defines the grading scheme for a project
      projectName: project name
      questionsAndMaxesDict: a list of (question name, max points per question)
    """
    self.questions = [el[0] for el in questionsAndMaxesList]
    self.maxes = dict(questionsAndMaxesList)
    self.points = Counter()
    self.messages = dict([(q, []) for q in self.questions])
    self.project = projectName
    self.start = time.localtime()[1:6]
    self.sane = True # Sanity checks
    self.currentQuestion = None # Which question we're grading
    self.edxOutput = edxOutput
    self.mute = muteOutput
    self.prereqs = defaultdict(set)

    #print 'Autograder transcript for %s' % self.project
    print 'Starting on %d-%d at %d:%02d:%02d' % self.start

  def addPrereq(self, question, prereq):
    self.prereqs[question].add(prereq)

  def grade(self, gradingModule, exceptionMap = {}, bonusPic = False):
    """
    Grades each question
      gradingModule: the module with all the grading functions (pass in with sys.modules[__name__])
    """

    completedQuestions = set([])
    for q in self.questions:
      print '\nQuestion %s' % q
      print '=' * (9 + len(q))
      print
      self.currentQuestion = q

      incompleted = self.prereqs[q].difference(completedQuestions)
      if len(incompleted) > 0:
          prereq = incompleted.pop()
          print \
"""*** NOTE: Make sure to complete Question %s before working on Question %s,
*** because Question %s builds upon your answer for Question %s.
""" % (prereq, q, q, prereq)
          continue

      if self.mute: util.mutePrint()
      try:
        util.TimeoutFunction(getattr(gradingModule, q),300)(self) # Call the question's function
        #TimeoutFunction(getattr(gradingModule, q),1200)(self) # Call the question's function
      except Exception, inst:
        self.addExceptionMessage(q, inst, traceback)
        self.addErrorHints(exceptionMap, inst, q[1])
      except:
        self.fail('FAIL: Terminated with a string exception.')
      finally:
        if self.mute: util.unmutePrint()

      if self.points[q] >= self.maxes[q]:
        completedQuestions.add(q)

      print '\n### Question %s: %d/%d ###\n' % (q, self.points[q], self.maxes[q])


    print '\nFinished at %d:%02d:%02d' % time.localtime()[3:6]
    print "\nProvisional grades\n=================="

    for q in self.questions:
      print 'Question %s: %d/%d' % (q, self.points[q], self.maxes[q])
    print '------------------'
    print 'Total: %d/%d' % (self.points.totalCount(), sum(self.maxes.values()))
    if bonusPic and self.points.totalCount() == 25:
      print """

                     ALL HAIL GRANDPAC.
              LONG LIVE THE GHOSTBUSTING KING.

                  ---      ----      ---
                  |  \    /  + \    /  |
                  | + \--/      \--/ + |
                  |   +     +          |
                  | +     +        +   |
                @@@@@@@@@@@@@@@@@@@@@@@@@@
              @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            \   @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
             \ /  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
              V   \   @@@@@@@@@@@@@@@@@@@@@@@@@@@@
                   \ /  @@@@@@@@@@@@@@@@@@@@@@@@@@
                    V     @@@@@@@@@@@@@@@@@@@@@@@@
                            @@@@@@@@@@@@@@@@@@@@@@
                    /\      @@@@@@@@@@@@@@@@@@@@@@
                   /  \  @@@@@@@@@@@@@@@@@@@@@@@@@
              /\  /    @@@@@@@@@@@@@@@@@@@@@@@@@@@
             /  \ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            /    @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
            @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
              @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                @@@@@@@@@@@@@@@@@@@@@@@@@@
                    @@@@@@@@@@@@@@@@@@

"""
    print """
Your grades are NOT yet registered.  To register your grades, make sure
to follow your instructor's guidelines to receive credit on your project.
"""

    if self.edxOutput:
        self.produceOutput()

  def addExceptionMessage(self, q, inst, traceback):
    """
    Method to format the exception message, this is more complicated because
    we need to cgi.escape the traceback but wrap the exception in a <pre> tag
    """
    self.fail('FAIL: Exception raised: %s' % inst)
    self.addMessage('')
    for line in traceback.format_exc().split('\n'):
        self.addMessage(line)

  def addErrorHints(self, exceptionMap, errorInstance, questionNum):
    typeOf = str(type(errorInstance))
    questionName = 'q' + questionNum
    errorHint = ''

    # question specific error hints
    if exceptionMap.get(questionName):
      questionMap = exceptionMap.get(questionName)
      if (questionMap.get(typeOf)):
        errorHint = questionMap.get(typeOf)
    # fall back to general error messages if a question specific
    # one does not exist
    if (exceptionMap.get(typeOf)):
      errorHint = exceptionMap.get(typeOf)

    # dont include the HTML if we have no error hint
    if not errorHint:
      return ''

    for line in errorHint.split('\n'):
      self.addMessage(line)

  def produceOutput(self):
    edxOutput = open('edx_response.html', 'w')
    edxOutput.write("<div>")

    # first sum
    total_possible = sum(self.maxes.values())
    total_score = sum(self.points.values())
    checkOrX = '<span class="incorrect"/>'
    if (total_score >= total_possible):
        checkOrX = '<span class="correct"/>'
    header = """
        <h3>
            Total score ({total_score} / {total_possible})
        </h3>
    """.format(total_score = total_score,
      total_possible = total_possible,
      checkOrX = checkOrX
    )
    edxOutput.write(header)

    for q in self.questions:
      if len(q) == 2:
          name = q[1]
      else:
          name = q
      checkOrX = '<span class="incorrect"/>'
      if (self.points[q] == self.maxes[q]):
        checkOrX = '<span class="correct"/>'
      #messages = '\n<br/>\n'.join(self.messages[q])
      messages = "<pre>%s</pre>" % '\n'.join(self.messages[q])
      output = """
        <div class="test">
          <section>
          <div class="shortform">
            Question {q} ({points}/{max}) {checkOrX}
          </div>
        <div class="longform">
          {messages}
        </div>
        </section>
      </div>
      """.format(q = name,
        max = self.maxes[q],
        messages = messages,
        checkOrX = checkOrX,
        points = self.points[q]
      )
      # print "*** output for Question %s " % q[1]
      # print output
      edxOutput.write(output)
    edxOutput.write("</div>")
    edxOutput.close()
    edxOutput = open('edx_grade', 'w')
    edxOutput.write(str(self.points.totalCount()))
    edxOutput.close()

  def fail(self, message, raw=False):
    "Sets sanity check bit to false and outputs a message"
    self.sane = False
    self.assignZeroCredit()
    self.addMessage(message, raw)

  def assignZeroCredit(self):
    self.points[self.currentQuestion] = 0

  def addPoints(self, amt):
    self.points[self.currentQuestion] += amt

  def deductPoints(self, amt):
    self.points[self.currentQuestion] -= amt

  def assignFullCredit(self, message="", raw=False):
    self.points[self.currentQuestion] = self.maxes[self.currentQuestion]
    if message != "":
      self.addMessage(message, raw)

  def addMessage(self, message, raw=False):
    if not raw:
        # We assume raw messages, formatted for HTML, are printed separately
        if self.mute: util.unmutePrint()
        print '*** ' + message
        if self.mute: util.mutePrint()
        message = cgi.escape(message)
    self.messages[self.currentQuestion].append(message)

  def addMessageToEmail(self, message):
    print "WARNING**** addMessageToEmail is deprecated %s" % message
    for line in message.split('\n'):
      pass
      #print '%%% ' + line + ' %%%'
      #self.messages[self.currentQuestion].append(line)





class Counter(dict):
  """
  Dict with default 0
  """
  def __getitem__(self, idx):
    try:
      return dict.__getitem__(self, idx)
    except KeyError:
      return 0

  def totalCount(self):
    """
    Returns the sum of counts for all keys.
    """
    return sum(self.values())

