#! /usr/bin/perl
#
# Copyright (C) 2008-2021 Alexis Bienvenüe <paamc@passoire.fr>
#
# This file is part of Auto-Multiple-Choice
#
# Auto-Multiple-Choice is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 2 of
# the License, or (at your option) any later version.
#
# Auto-Multiple-Choice is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Auto-Multiple-Choice.  If not, see
# <http://www.gnu.org/licenses/>.

use warnings;
use 5.012;

use Getopt::Long;
use POSIX qw(ceil floor);
use AMC::Basic;
use AMC::Gui::Avancement;
use AMC::Scoring;
use AMC::Data;

use utf8;

my $darkness_threshold    = 0.1;
my $darkness_threshold_up = 1.0;

my $floor_mark      = '';
my $null_mark       = 0;
my $perfect_mark    = 20;
my $ceiling         = 1;
my $granularity     = '0.5';
my $rounding        = '';
my $rounding_scheme = '';
my $data_dir        = '';

my $postcorrect_student      = '';
my $postcorrect_copy         = '';
my $postcorrect_set_multiple = '';

my $progres    = 1;
my $progres_id = '';

unpack_args();

GetOptions(
    "data=s"                    => \$data_dir,
    "seuil=s"                   => \$darkness_threshold,
    "seuil-up=s"                => \$darkness_threshold_up,
    "grain=s"                   => \$granularity,
    "arrondi=s"                 => \$rounding_scheme,
    "notemax=s"                 => \$perfect_mark,
    "plafond!"                  => \$ceiling,
    "notemin=s"                 => \$floor_mark,
    "notenull=s"                => \$null_mark,
    "postcorrect-student=s"     => \$postcorrect_student,
    "postcorrect-copy=s"        => \$postcorrect_copy,
    "postcorrect-set-multiple!" => \$postcorrect_set_multiple,
    "progression-id=s"          => \$progres_id,
    "progression=s"             => \$progres,
);

# fixes decimal separator ',' potential problem, replacing it with a
# dot.
for my $x ( \$granularity, \$null_mark, \$floor_mark, \$perfect_mark ) {
    $$x =~ s/,/./;
    $$x =~ s/\s+//;
}

# Implements the different possible rounding schemes.

sub rounding_inf {
    my $x = shift;
    return ( floor($x) );
}

sub rounding_central {
    my $x = shift;
    return ( floor( $x + 0.5 ) );
}

sub rounding_sup {
    my $x = shift;
    return ( ceil($x) );
}

my %rounding_function =
  ( i => \&rounding_inf, n => \&rounding_central, s => \&rounding_sup );

# sets the rounding scheme to use to compute students marks, from
# parameter $rounding_scheme

if ($rounding_scheme) {
    for my $k ( keys %rounding_function ) {
        if ( $rounding_scheme =~ /^$k/i ) {
            $rounding = $rounding_function{$k};
        }
    }
}

# Parameter $data_dir is needed!

if ( !-d $data_dir ) {
    attention("No DATA directory: $data_dir");
    die "No DATA directory: $data_dir";
}

# Parameter $granularity must be positive. If not, marks rounding is
# cancelled.

if ( $granularity <= 0 ) {
    $granularity     = 1;
    $rounding        = '';
    $rounding_scheme = '';
    debug("Nonpositive grain: rounding off");
}

# Uses an AMC::Gui::Avancement object to tell regularly the calling
# program how much work we have done so far.

my $avance = AMC::Gui::Avancement::new( $progres, id => $progres_id );

# Connects to the databases capture (to get the students sheets and to
# know which boxes have been ticked) and scoring (to write the
# computed scores!).

my $data    = AMC::Data->new($data_dir);
my $capture = $data->module('capture');
my $scoring = $data->module('scoring');
my $layout  = $data->module('layout');

# Uses an AMC::Scoring object to actually compute the questions
# scores.

my $score = AMC::Scoring->new(
    onerror  => 'die',
    data     => $data,
    seuil    => $darkness_threshold,
    seuil_up => $darkness_threshold_up,
);

$avance->progres(0.05);

# One only transaction for all the work:

$data->begin_transaction('MARK');

# get some useful build variables

my $code_digit_pattern = $layout->code_digit_pattern();

# Write the variables values in the database, so that they can be
# retrieved later, and clears all the scores that could have been
# already computed.

annotate_source_change($capture);
$scoring->clear_score;
$scoring->variable( 'darkness_threshold',       $darkness_threshold );
$scoring->variable( 'darkness_threshold_up',    $darkness_threshold_up );
$scoring->variable( 'mark_null',                $null_mark );
$scoring->variable( 'mark_floor',               $floor_mark );
$scoring->variable( 'mark_max',                 $perfect_mark );
$scoring->variable( 'ceiling',                  $ceiling );
$scoring->variable( 'rounding',                 $rounding_scheme );
$scoring->variable( 'granularity',              $granularity );
$scoring->variable( 'postcorrect_student',      $postcorrect_student );
$scoring->variable( 'postcorrect_copy',         $postcorrect_copy );
$scoring->variable( 'postcorrect_set_multiple', $postcorrect_set_multiple );

# Gets the student/copy pairs that has been captured. Each element
# from the array @captured_studentcopy is an arrayref containing a different
# (student,copy) pair.

my @captured_studentcopy = $capture->student_copies();

# We already said that 0.05 of the work has been made, so the
# remaining ratio $delta per student/copy is:

my $delta = 0.95;
$delta /= ( 1 + $#captured_studentcopy ) if ( $#captured_studentcopy >= 0 );

# If postcorrect mode is requested, sets the correct answers from the
# teacher's copy.

if ($postcorrect_student) {
    $scoring->postcorrect(
        $postcorrect_student, $postcorrect_copy,
        $darkness_threshold,  $darkness_threshold_up,
        $postcorrect_set_multiple
    );
}

# Processes each student/copy in turn

for my $sc (@captured_studentcopy) {
    debug "MARK: --- SHEET " . studentids_string(@$sc);

    # The hash %codes collects the values of the AMCcodes.

    my %codes = ();

    # Gets the scoring strategy for current student/copy, including
    # which answers are correct, from the scoring database.

    my $ssb = $scoring->student_scoring_base_sorted( @$sc, $darkness_threshold,
        $darkness_threshold_up );

    # transmits the main strategy (default strategy options values for
    # all questions) to the scoring engine.

    $score->set_default_strategy( $ssb->{main_strategy} );

    # The @question_scores collects scores for all questions

    my @question_scores = ();

    # Process each question in turn

    for my $q ( @{ $ssb->{questions} } ) {

        my $question = $q->{question};

        # $question is the question numerical ID, and
        # $q is the question scoring data (see AMC::DataModule::scoring)

        debug "MARK: QUESTION $question TITLE " . $q->{title};

        # Uses the scoring engine to score the question...
        #
        # $xx is the student score for this question,
        #
        # $why will give the reason for this score ("V" means no box
        # were ticked, for exemple).
        #
        # $max_score is the maximum score (score for perfect answers)

        $score->prepare_question($q);
        $score->set_type(0);
        my ( $xx, $why ) = $score->score_question( $sc->[0], $q, 0 );
        $score->set_type(1);
        use Data::Dumper;
        debug( "1ST " . Dumper( $score->{env}->{directives} ) );
        my ($max_score) = $score->score_max_question( $sc->[0], $q );

        # If the title of the question is 'codename[N]' (with a numerical
        # N), then this question represents a digit from a AMCcode, so we
        # collect the value in the %codes hash.

        if ( $q->{title} =~ /^(.*)$code_digit_pattern$/ ) {
            my $code_name  = $1;
            my $code_digit = $2;
            my $chars      = $capture->ticked_chars_pasted( @$sc, $question,
                $darkness_threshold, $darkness_threshold_up );
            $chars = $xx if ( !defined($chars) );
            debug "- code($code_name,$code_digit) = '$chars'";
            $codes{$code_name}->{$code_digit} = $chars;
        }

        if ( $q->{indicative} ) {

            # If the question is indicative, we don't collect the value in
            # the @question_scores array
            $max_score = 1;
        } else {

            # Otherwise, we collect all scoring results to compute later the
            # overall aggregated score for the student.
            push @question_scores,
              {
                score    => $xx,
                raison   => $why,
                notemax  => $max_score,
                sc       => [@$sc],
                question => $question,
              };
        }

        # Write the scoring results in the scoring database.

        $scoring->new_score( @$sc, $question, $xx, $max_score, $why );
    }

    # Compute the final total score aggregating questions scores

    my ( $total, $max_i ) = $score->global_score( $scoring, @question_scores );

    # Now apply rounding scheme

    my $x;

    if ( $perfect_mark > 0 ) {
        $x = ( $perfect_mark - $null_mark ) / $granularity * $total / $max_i;
    } else {
        $x = $total / $granularity;
    }
    $x = &$rounding($x) if ($rounding);
    $x *= $granularity;
    $x += $null_mark;

    # Apply ceiling

    $x = $perfect_mark
      if ( $perfect_mark > 0
        && $ceiling
        && ( $x - $perfect_mark ) * ( $perfect_mark - $null_mark ) > 0 );

    # Apply floor

    if ( $floor_mark ne '' && $floor_mark !~ /[a-z]/i ) {
        $x = $floor_mark
          if ( ( $perfect_mark == 0 && $x < $floor_mark )
            || ( $x - $floor_mark ) * ( $perfect_mark - $null_mark ) < 0 );
    }

    # Writes the student's final mark in the scoring database

    $scoring->new_mark( @$sc, $total, $max_i, $x );

    # Build the AMCcodes values from their digits, and store them in the
    # scoring database

    for my $k ( keys %codes ) {
        my @i = ( keys %{ $codes{$k} } );
        if ( $#i >= 0 ) {
            my $v = join(
                '', map { $codes{$k}->{$_} }
                  sort { $b <=> $a } (@i)
            );
            $scoring->new_code( @$sc, $k, $v );
        }
    }

    # Tell the calling program that we have finished scoring a student

    $avance->progres($delta);
}

# The end!

$data->end_transaction('MARK');

$avance->fin();

