<?php

class BoltExerciseSet extends BoltRandom {
    public $repeats;
    function __construct($name, $units, $number, $repeats) {
        parent::__construct($name, $units, $number);
        $this->repeats = $repeats;
    }

    // called when an exercise in this set has just been graded.
    // - record the score in our state structure
    // - return a structure saying what navigation info to show:
    //   - review
    //   - repeat now
    //   - next
    //
    function xset_callback(&$iter, $score, $view_id, &$is_last, &$nav_info) {
        echo "XSET_CALLBACK: $score";
        $nav_info = null;
        $state_rec = $iter->state[$this->name];
        $nshown = $state_rec['nshown'];
        $state_rec['scores'][$nshown] = $score;
        $iter->state[$this->name] = $state_rec;
        $is_last = ($nshown == $this->ntoshow);
        if (!$is_last) return;

        // this exercise set is now "completed".
        //   - create exercise_set_result record
        //   - optionally create or update bolt_refresh record
        //
        $total_score = 0;
        for ($i=0; $i<$nshown; $i++) {
            $total_score += $state_rec['score'][$i];
        }
        $avg_score = $total_score/$nshown;

        $now = time();
        $id = BoincXsetResult::insert("(create_time, user_id, course_id, name, score, view_id) values ($now, $user->id, $course->id, '$this->name', $avg_score, $view_id)");
        $due_time = $now + 100000;
        BoincRefresh::replace("create_time=$now, user_id=$user->id, course_id=$course->id, name='$this->name', set_result_id=$id, due_time=$due_time");
    }

    function walk(&$iter, $incr, &$frac_done) {
        $iter->xset = $this;
        return parent::walk($iter, $incr, $frac_done);
    }
}

class BoltRefresh{
    public $intervals;
    function __construct($i) {
        $this->intervals = $i;
    }
}

class BoltRepeat {
    public $score;
    public $unit;
    public $flags;
    function __construct($s, $u, $f) {
        $this->score = $s;
        $this->unit = $u;
        $this->flags = $f;
    }
}

define('REVIEW', 1);
define('REPEAT', 2);
define('NEXT', 4);

function repeat($s, $u, $f) {
    return new BoltRepeat($s, $u, $f);
}

function refresh($a) {
    return new BoltRefresh($a);
}

function exercise_set() {
    $args = func_get_args();
    $units = array();
    $repeats = array();
    $refresh = null;
    $name = "";
    $number = 1;
    foreach ($args as $arg) {
        if (is_array($arg)) {
            switch ($arg[0]) {
            case 'name': $name = $arg[1]; break;
            case 'title': $title = $arg[1]; break;
            case 'number': $number = $arg[1]; break;
            default: echo "Unrecognized array arg: ", $arg[0], "\n"; break;
            }
        } else if (is_object($arg)) {
            if (get_class($arg) == "BoltExercise") {
                $units[] = $arg;
            } else if (get_class($arg) == "BoltRepeat") {
                $repeats[] = $arg;
            } else if (get_class($arg) == "BoltRefresh") {
                $refresh= $arg;
            } else {
                echo "Can't include object of type ".get_class($arg)." within an exercise set.";
            }
        }
    }
    return new BoltExerciseSet($name, $units, $number, $repeats, $refresh);
}

?>