<?php
/* For licensing terms, see /license.txt */

/**
 * This file contains a class used like library provides functions for
 * course description tool. It's also used like model to
 * course_description_controller (MVC pattern)
 * @author Christian Fasanando <christian1827@gmail.com>
 * @package chamilo.course_description
 */

/**
 * Class CourseDescription course descriptions
 *
 * @package chamilo.course_description
 */
class CourseDescription
{
    private $id;
    private $course_id;
    private $title;
    private $content;
    private $session_id;
    private $description_type;
    private $progress;

    /**
     * Constructor
     */
    public function __construct()
    {

    }

    /**
     * Returns an array of objects of type CourseDescription corresponding to
     * a specific course, without session ids (session id = 0)
     *
     * @param int $course_id
     *
     * @return array Array of CourseDescriptions
     */
    public static function get_descriptions($course_id)
    {
        // Get course code
        $course_info = api_get_course_info_by_id($course_id);
        if (!empty($course_info)) {
            $course_id = $course_info['real_id'];
        } else {
            return array();
        }
        $t_course_desc = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $sql = "SELECT * FROM $t_course_desc
                WHERE c_id = $course_id AND session_id = '0'";
        $sql_result = Database::query($sql);
        $results = array();
        while ($row = Database::fetch_array($sql_result)) {
            $desc_tmp = new CourseDescription();
            $desc_tmp->set_id($row['id']);
            $desc_tmp->set_title($row['title']);
            $desc_tmp->set_content($row['content']);
            $desc_tmp->set_session_id($row['session_id']);
            $desc_tmp->set_description_type($row['description_type']);
            $desc_tmp->set_progress($row['progress']);
            $results[] = $desc_tmp;
        }

        return $results;
    }

    /**
     * Get all data of course description by session id,
     * first you must set session_id property with the object CourseDescription
     * @return array
     */
    public function get_description_data()
    {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $condition_session = api_get_session_condition($this->session_id, true, true);
        $course_id = api_get_course_int_id();
        $sql = "SELECT * FROM $tbl_course_description
		        WHERE c_id = $course_id $condition_session
		        ORDER BY id ";
        $rs = Database::query($sql);
        $data = array();
        while ($description = Database::fetch_array($rs)) {
            $data['descriptions'][$description['id']] = Security::remove_XSS($description, STUDENT);
        }

        return $data;
    }

    /**
     * Get all data by description and session id,
     * first you must set session_id property with the object CourseDescription
     * @param   int  $description_type Description type
     * @param   string $courseId Course code (optional)
     * @param   int $session_id Session id (optional)
     * @return  array    List of fields from the descriptions found of the given type
     */
    public function get_data_by_description_type(
        $description_type,
        $courseId = null,
        $session_id = null
    ) {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        if (empty($courseId)) {
            $courseId = api_get_course_int_id();
        }

        if (!isset($session_id)) {
            $session_id = $this->session_id;
        }
        $condition_session = api_get_session_condition($session_id);
        $description_type = intval($description_type);
        $sql = "SELECT * FROM $tbl_course_description
		        WHERE c_id = $courseId AND description_type='$description_type' $condition_session ";
        $rs = Database::query($sql);
        $data = array();
        if ($description = Database::fetch_array($rs)) {
            $data['description_title'] = $description['title'];
            $data['description_content'] = $description['content'];
            $data['progress'] = $description['progress'];
            $data['id'] = $description['id'];
        }

        return $data;
    }

    /**
     * @param int $id
     * @param string $course_code
     * @param int $session_id
     *
     * @return array
     */
    public function get_data_by_id($id, $course_code = '', $session_id = null)
    {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();

        if (!isset($session_id)) {
            $session_id = $this->session_id;
        }
        $condition_session = api_get_session_condition($session_id);
        if (!empty($course_code)) {
            $course_info = api_get_course_info($course_code);
            $course_id = $course_info['real_id'];
        }
        $id = intval($id);
        $sql = "SELECT * FROM $tbl_course_description
		        WHERE c_id = $course_id AND id='$id' $condition_session ";
        $rs = Database::query($sql);
        $data = array();
        if ($description = Database::fetch_array($rs)) {
            $data['description_type'] = $description['description_type'];
            $data['description_title'] = $description['title'];
            $data['description_content'] = $description['content'];
            $data['progress'] = $description['progress'];
        }

        return $data;
    }


    /**
     * Get maximum description type by session id,
     * first you must set session_id properties with the object CourseDescription
     * @return  int  maximum description time adding one
     */
    public function get_max_description_type()
    {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();

        $sql = "SELECT MAX(description_type) as MAX
                FROM $tbl_course_description
		        WHERE c_id = $course_id AND session_id='".$this->session_id."'";
        $rs = Database::query($sql);
        $max = Database::fetch_array($rs);

        if ($max['MAX'] >= 8) {
            $description_type = 8;
        } else {
            $description_type = $max['MAX'] + 1;
        }

        if ($description_type < ADD_BLOCK) {
            $description_type = ADD_BLOCK;
        }

        return $description_type;
    }

    /**
     * Insert a description to the course_description table,
     * first you must set description_type, title, content, progress and
     * session_id properties with the object CourseDescription
     * @return  int  affected rows
     */
    public function insert()
    {
        if (empty($this->course_id)) {
            $course_id = api_get_course_int_id();
        } else {
            $course_id = $this->course_id;
        }
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);

        $params = [
            'c_id' => $course_id,
            'description_type' => $this->description_type,
            'title' => $this->title,
            'content' => $this->content,
            'progress' => intval($this->progress),
            'session_id' => $this->session_id
        ];

        $last_id = Database::insert($table, $params);

        if ($last_id > 0) {
            $sql = "UPDATE $table SET id = iid WHERE iid = $last_id";
            Database::query($sql);

            // insert into item_property
            api_item_property_update(
                api_get_course_info(),
                TOOL_COURSE_DESCRIPTION,
                $last_id,
                'CourseDescriptionAdded',
                api_get_user_id()
            );
        }

        return ($last_id > 0) ? 1 : 0;
    }

    /**
     * Insert a row like history inside track_e_item_property table
     * first you must set description_type, title, content, progress and
     * session_id properties with the object CourseDescription
     * @param   int    $description_type
     * @return  int        affected rows
     */
    public function insert_stats($description_type)
    {
        $tbl_stats_item_property = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ITEM_PROPERTY);
        $description_id = $this->get_id_by_description_type($description_type);
        $course_id = api_get_course_int_id();
        $course_code = api_get_course_id();
        $item_property_id = api_get_item_property_id(
            $course_code,
            TOOL_COURSE_DESCRIPTION,
            $description_id
        );

        $params = [
            'c_id' => api_get_course_int_id(),
            'course_id' => $course_id,
            'item_property_id' => $item_property_id,
            'title' => $this->title,
            'content' => $this->content,
            'progress' => $this->progress,
            'lastedit_date' => api_get_utc_datetime(),
            'lastedit_user_id' => api_get_user_id(),
            'session_id' => $this->session_id,
        ];

        $result = Database::insert($tbl_stats_item_property, $params);

        return $result ? 1 : 0;
    }

    /**
     * Update a description, first you must set description_type, title, content, progress
     * and session_id properties with the object CourseDescription
     * @return int    affected rows
     */
    public function update()
    {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);

        $params = [
            'title' => $this->title,
            'content' => $this->content,
            'progress' => intval($this->progress),
        ];

        Database::update(
            $table,
            $params,
            [
                'id = ? AND session_id = ? AND c_id = ?' => [
                    $this->id,
                    $this->session_id,
                    $this->course_id ? $this->course_id : api_get_course_int_id(),
                ]
            ]
        );

        if ($this->id > 0) {
            //insert into item_property
            api_item_property_update(
                api_get_course_info(),
                TOOL_COURSE_DESCRIPTION,
                $this->id,
                'CourseDescriptionUpdated',
                api_get_user_id()
            );
        }

        return 1;
    }

    /**
     * Delete a description, first you must set description_type and session_id
     * properties with the object CourseDescription
     * @return int    affected rows
     */
    public function delete()
    {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();
        $sql = "DELETE FROM $tbl_course_description
			 	WHERE
			 	    c_id = $course_id AND
			 	    id = '".intval($this->id)."' AND
			 	    session_id = '" . intval($this->session_id)."'";
        $result = Database::query($sql);
        $affected_rows = Database::affected_rows($result);
        if ($this->id > 0) {
            //insert into item_property
            api_item_property_update(
                api_get_course_info(),
                TOOL_COURSE_DESCRIPTION,
                $this->id,
                'CourseDescriptionDeleted',
                api_get_user_id()
            );
        }

        return $affected_rows;
    }

    /**
     * Get description id by description type
     * @param int $description_type
     *
     * @return int description id
     */
    public function get_id_by_description_type($description_type)
    {
        $tbl_course_description = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();

        $sql = "SELECT id FROM $tbl_course_description
		        WHERE c_id = $course_id AND description_type = '".intval($description_type)."'";
        $rs = Database::query($sql);
        $row = Database::fetch_array($rs);
        $description_id = $row['id'];

        return $description_id;
    }

    /**
     * Get description titles by default
     * @return array
     */
    public function get_default_description_title()
    {
        $default_description_titles = array();
        $default_description_titles[1] = get_lang('GeneralDescription');
        $default_description_titles[2] = get_lang('Objectives');
        $default_description_titles[3] = get_lang('Topics');
        $default_description_titles[4] = get_lang('Methodology');
        $default_description_titles[5] = get_lang('CourseMaterial');
        $default_description_titles[6] = get_lang('HumanAndTechnicalResources');
        $default_description_titles[7] = get_lang('Assessment');
        $default_description_titles[8] = get_lang('Other');

        return $default_description_titles;
    }

    /**
     * Get description titles editable by default
     * @return array
     */
    public function get_default_description_title_editable()
    {
        $default_description_title_editable = array();
        $default_description_title_editable[1] = true;
        $default_description_title_editable[2] = true;
        $default_description_title_editable[3] = true;
        $default_description_title_editable[4] = true;
        $default_description_title_editable[5] = true;
        $default_description_title_editable[6] = true;
        $default_description_title_editable[7] = true;
        //$default_description_title_editable[8] = true;

        return $default_description_title_editable;
    }

    /**
     * Get description icons by default
     * @return array
     */
    public function get_default_description_icon()
    {
        $default_description_icon = array();
        $default_description_icon[1] = 'info.png';
        $default_description_icon[2] = 'objective.png';
        $default_description_icon[3] = 'topics.png';
        $default_description_icon[4] = 'strategy.png';
        $default_description_icon[5] = 'laptop.png';
        $default_description_icon[6] = 'teacher.png';
        $default_description_icon[7] = 'assessment.png';
        //$default_description_icon[8]= 'porcent.png';
        $default_description_icon[8] = 'wizard.png';

        return $default_description_icon;
    }

    /**
     * Get questions by default for help
     * @return array
     */
    public function get_default_question()
    {
        $question = array();
        $question[1] = get_lang('GeneralDescriptionQuestions');
        $question[2] = get_lang('ObjectivesQuestions');
        $question[3] = get_lang('TopicsQuestions');
        $question[4] = get_lang('MethodologyQuestions');
        $question[5] = get_lang('CourseMaterialQuestions');
        $question[6] = get_lang('HumanAndTechnicalResourcesQuestions');
        $question[7] = get_lang('AssessmentQuestions');
        //$question[8]= get_lang('ThematicAdvanceQuestions');

        return $question;
    }

    /**
     * Get informations by default for help
     * @return array
     */
    public function get_default_information()
    {
        $information = array();
        $information[1] = get_lang('GeneralDescriptionInformation');
        $information[2] = get_lang('ObjectivesInformation');
        $information[3] = get_lang('TopicsInformation');
        $information[4] = get_lang('MethodologyInformation');
        $information[5] = get_lang('CourseMaterialInformation');
        $information[6] = get_lang('HumanAndTechnicalResourcesInformation');
        $information[7] = get_lang('AssessmentInformation');
        //$information[8]= get_lang('ThematicAdvanceInformation');

        return $information;
    }

    /**
     * Set description id
     * @return void
     */
    public function set_id($id)
    {
        $this->id = $id;
    }

    /**
     * Set description's course id
     * @param int $id Course ID
     * @return void
     */
    public function set_course_id($id)
    {
        $this->course_id = intval($id);
    }

    /**
     * Set description title
     * @param string $title
     */
    public function set_title($title)
    {
        $this->title = $title;
    }

    /**
     * Set description content
     *
     * @param string $content
     */
    public function set_content($content)
    {
        $this->content = $content;
    }

    /**
     *
     * Set description session id
     *
     * @param int $session_id
     */
    public function set_session_id($session_id)
    {
        $this->session_id = $session_id;
    }

    /**
     * Set description type
     * @return void
     */
    public function set_description_type($description_type)
    {
        $this->description_type = $description_type;
    }

    /**
     *
     * Set progress of a description
     *
     * @param string $progress
     */
    public function set_progress($progress)
    {
        $this->progress = $progress;
    }

    /**
     * get description id
     *
     * @return int
     */
    public function get_id()
    {
        return $this->id;
    }

    /**
     * get description title
     *
     * @return string
     */
    public function get_title()
    {
        return $this->title;
    }

    /**
     * get description content
     * @return string
     */
    public function get_content()
    {
        return $this->content;
    }

    /**
     * get session id
     *
     * @return int
     */
    public function get_session_id()
    {
        return $this->session_id;
    }

    /**
     * get description type
     *
     * @return int
     */
    public function get_description_type()
    {
        return $this->description_type;
    }

    /**
     * get progress of a description
     *
     * @return int
     */
    public function get_progress()
    {
        return $this->progress;
    }
}