<?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)
    {
        $course_id = (int) $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 [];
        }
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $sql = "SELECT * FROM $table
                WHERE c_id = $course_id AND session_id = '0'";
        $sql_result = Database::query($sql);
        $results = [];
        while ($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()
    {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $condition_session = api_get_session_condition(
            $this->session_id,
            true,
            true
        );
        $course_id = $this->course_id ?: api_get_course_int_id();

        if (empty($course_id)) {
            return [];
        }

        $sql = "SELECT * FROM $table
		        WHERE c_id = $course_id $condition_session
		        ORDER BY id ";
        $rs = Database::query($sql);
        $data = [];
        while ($description = Database::fetch_array($rs)) {
            $data['descriptions'][$description['id']] = $description;
        }

        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
    ) {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $courseId = (int) $courseId;

        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 = (int) $description_type;

        $sql = "SELECT * FROM $table
		        WHERE 
		            c_id = $courseId AND 
		            description_type = '$description_type' 
		            $condition_session ";
        $rs = Database::query($sql);
        $data = [];
        if ($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)
    {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();
        $id = (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'];
        }

        $sql = "SELECT * FROM $table
		        WHERE c_id = $course_id AND id='$id' $condition_session ";
        $rs = Database::query($sql);
        $data = [];
        if ($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()
    {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();

        $sql = "SELECT MAX(description_type) as MAX
                FROM $table
		        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;
    }

    /**
     * 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()
    {
        $table = Database::get_course_table(TABLE_COURSE_DESCRIPTION);
        $course_id = api_get_course_int_id();
        $sql = "DELETE FROM $table
			 	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 titles by default.
     *
     * @return array
     */
    public function get_default_description_title()
    {
        $default_description_titles = [];
        $default_description_titles[1] = get_lang('Description');
        $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('Course material');
        $default_description_titles[6] = get_lang('Resources');
        $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 = [];
        $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 = [];
        $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] = 'wizard.png';

        return $default_description_icon;
    }

    /**
     * Get questions by default for help.
     *
     * @return array
     */
    public function get_default_question()
    {
        $question = [];
        $question[1] = get_lang('DescriptionQuestions');
        $question[2] = get_lang('What should the end results be when the learner has completed the course? What are the activities performed during the course?');
        $question[3] = get_lang('How does the course progress? Where should the learner pay special care? Are there identifiable problems in understanding different areas? How much time should one dedicate to the different areas of the course?');
        $question[4] = get_lang('What methods and activities help achieve the objectives of the course?  What would the schedule be?');
        $question[5] = get_lang('Course materialQuestions');
        $question[6] = get_lang('ResourcesQuestions');
        $question[7] = get_lang('How will learners be assessed? Are there strategies to develop in order to master the topic?');
        //$question[8]= get_lang('What is the current progress you have reached with your learners inside your course? How much do you think is remaining in comparison to the complete program?');

        return $question;
    }

    /**
     * Get informations by default for help.
     *
     * @return array
     */
    public function get_default_information()
    {
        $information = [];
        $information[1] = get_lang('DescriptionInformation');
        $information[2] = get_lang('What are the objectives of the course (competences, skills, outcomes)?');
        $information[3] = get_lang('List of topics included in the training. Importance of each topic. Level of difficulty. Structure and inter-dependence of the different parts.');
        $information[4] = get_lang('Presentation of the activities (conference, papers, group research, labs...).');
        $information[5] = get_lang('Course materialInformation');
        $information[6] = get_lang('ResourcesInformation');
        $information[7] = get_lang('Criteria for skills acquisition.');
        //$information[8]= get_lang('The thematic advance tool allows you to organize your course through time.');

        return $information;
    }

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

    /**
     * Set description's course id.
     *
     * @param int $id Course ID
     */
    public function set_course_id($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.
     */
    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;
    }
}