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

/**
 * Class ExtraFieldOption
 * Handles the extra fields for various objects (users, sessions, courses)
 */
class ExtraFieldOption extends Model
{
    public $columns = array(
        'id',
        'field_id',
        'option_value',
        'display_text',
        'option_order',
        'priority',
        'priority_message',
        'tms'
    );

    public $extraField;

    /**
     * Gets the table for the type of object for which we are using an extra field
     * @param string $type Type of object (course, user or session)
     */
    public function __construct($type)
    {
        $this->type = $type;
        $extraField = new ExtraField($this->type);
        $this->extraField = $extraField;

        $this->table = Database::get_main_table(TABLE_EXTRA_FIELD_OPTIONS);
        $this->tableExtraField = Database::get_main_table(TABLE_EXTRA_FIELD);
    }

    /**
     * @return ExtraField
     */
    public function getExtraField()
    {
        return $this->extraField;
    }


    /**
     * Gets the number of options already available in the table for this item type
     * @return int Number of options available
     * @assert () >= 0
     */
    /*public function get_count()
    {
        $row = Database::select('count(*) as count', $this->table, array(), 'first');

        return $row['count'];
    }*/

    /**
     * Gets the number of options available for this field
     * @param int $fieldId
     *
     * @return int Number of options
     * @assert ('') === false
     * @assert (-1) == 0
     * @assert (0) == 0
     */
    public function get_count_by_field_id($fieldId)
    {
        if (empty($fieldId)) {
            return false;
        }
        $extraFieldType = $this->getExtraField()->getExtraFieldType();
        $fieldId = intval($fieldId);

        $sql = "SELECT count(*) as count
                FROM $this->table o INNER JOIN $this->tableExtraField e
                ON o.field_id = e.id
                WHERE
                    o.field_id = $fieldId AND
                    e.extra_field_type = ".$extraFieldType."
                ";
        $result = Database::query($sql);
        $result = Database::fetch_array($result);

        return $result['count'];
    }

    /**
     * Returns a list of options for a specific field, separated by ";"
     * @param int $field_id
     * @param bool $add_id_in_array Indicates whether we want the results to be given with their id
     * @param string $ordered_by Order by clause (without the "order by") to be added to the SQL query
     * @return string List of options separated by ;
     * @assert (-1, false, null) == ''
     */
    public function getFieldOptionsToString($field_id, $add_id_in_array = false, $ordered_by = null)
    {
        $options = self::get_field_options_by_field($field_id, $add_id_in_array, $ordered_by);
        $new_options = array();
        if (!empty($options)) {
            foreach ($options as $option) {
                $new_options[] = $option['option_value'].':'.$option['display_text'];
            }
            $string = implode(';', $new_options);

            return $string;
        }

        return '';
    }

    /**
     * Delete all the options of a specific field
     * @param int $field_id
     *
     * @result void
     * @assert (-1) === false
     */
    public function delete_all_options_by_field_id($field_id)
    {
        $field_id = intval($field_id);
        $sql = "DELETE FROM {$this->table} WHERE field_id = $field_id";
        $r = Database::query($sql);

        return $r;
    }

    /**
     * @param array $params
     * @param bool  $showQuery
     *
     * @return int
     */
    public function saveOptions($params, $showQuery = false)
    {
        $optionInfo = self::get_field_option_by_field_and_option(
            $params['field_id'],
            $params['option_value']
        );

        if ($optionInfo == false) {
            $optionValue = api_replace_dangerous_char($params['option_value']);
            $order = self::get_max_order($params['field_id']);
            $newParams = array(
                'field_id' => $params['field_id'],
                'value' => trim($optionValue),
                'display_text' => trim($params['display_text']),
                'option_order' => $order
            );

            return parent::save($newParams, $showQuery);
        }

        return false;
    }

    /**
     * Saves an option into the corresponding *_field_options table
     * @param array $params Parameters to be considered for the insertion
     * @param bool $showQuery Whether to show the query (sent to the parent save() method)
     *
     * @return bool True on success, false on error
     * @assert (array('field_id'=>0), false) === false
     * @assert (array('field_id'=>1), false) === true
     */
    public function save($params, $showQuery = false)
    {
        $field_id = intval($params['field_id']);

        if (empty($field_id)) {
            return false;
        }

        $time = api_get_utc_datetime();
        if (!empty($params['field_options']) &&
            in_array(
                $params['field_type'],
                array(
                    ExtraField::FIELD_TYPE_RADIO,
                    ExtraField::FIELD_TYPE_SELECT,
                    ExtraField::FIELD_TYPE_SELECT_MULTIPLE,
                    ExtraField::FIELD_TYPE_DOUBLE_SELECT
                )
            )
        ) {
            if ($params['field_type'] == ExtraField::FIELD_TYPE_DOUBLE_SELECT) {
                //$params['field_options'] = France:Paris;Bretagne;Marseilles;Lyon|Belgique:Bruxelles;Namur;Liège;Bruges|Peru:Lima;Piura;
                $options_parsed = ExtraField::extra_field_double_select_convert_string_to_array(
                    $params['field_options']
                );

                if (!empty($options_parsed)) {
                    foreach ($options_parsed as $key => $option) {
                        $sub_options = $option['options'];

                        $new_params = array(
                            'field_id' => $field_id,
                            'option_value' => 0,
                            'display_text' => $option['label'],
                            'option_order' => 0,
                        );

                        // Looking if option already exists:
                        $option_info = self::get_field_option_by_field_id_and_option_display_text(
                            $field_id,
                            $option['label']
                        );

                        if (empty($option_info)) {
                            $sub_id = parent::save($new_params, $showQuery);
                        } else {
                            $sub_id = $option_info['id'];
                            $new_params['id'] = $sub_id;
                            parent::update($new_params, $showQuery);
                        }

                        foreach ($sub_options as $sub_option) {
                            if (!empty($sub_option)) {
                                $new_params  = array(
                                    'field_id' => $field_id,
                                    'option_value' => $sub_id,
                                    'display_text' => $sub_option,
                                    'option_order' => 0,
                                );

                                $option_info = self::getFieldOptionByFieldIdAndOptionDisplayTextAndOptionValue(
                                    $field_id,
                                    $sub_option,
                                    $sub_id
                                );

                                if (empty($option_info)) {
                                    parent::save($new_params, $showQuery);
                                } else {
                                    $new_params['id'] = $option_info['id'];
                                    parent::update($new_params, $showQuery);
                                }
                            }
                        }
                    }
                }
                $list = array();
            } else {
                $list = explode(';', $params['field_options']);
            }

            if (!empty($list)) {
                foreach ($list as $option) {
                    $option_info = self::get_field_option_by_field_and_option($field_id, $option);

                    // Use URLify only for new items
                    $optionValue = api_replace_dangerous_char($option);
                    $option = trim($option);

                    if ($option_info == false) {
                        $order      = self::get_max_order($field_id);

                        $new_params = array(
                            'field_id' => $field_id,
                            'option_value' => trim($optionValue),
                            'display_text' => trim($option),
                            'option_order' => $order,
                        );
                        parent::save($new_params, $showQuery);
                    }
                }
            }
        }

        return true;
    }

    /**
     * Save one option item at a time
     * @param array $params Parameters specific to the option
     * @param bool $show_query Whether to show the query (sent to parent save() method)
     * @param bool $insert_repeated Whether to insert even if the option already exists
     * @return bool True on success, false on failure
     * @assert (array('field_id'=>0),false) === false
     * @assert (array('field_id'=>0),false) === true
     */
    public function save_one_item($params, $show_query = false, $insert_repeated = true)
    {
        $field_id = intval($params['field_id']);
        if (empty($field_id)) {
            return false;
        }

        if (isset($params['option_value'])) {
            $params['option_value'] = trim($params['option_value']);
        }

        if (isset($params['display_text'])) {
            $params['display_text'] = trim($params['display_text']);
        }

        if (empty($params['option_order'])) {
            $order = self::get_max_order($field_id);
            $params['option_order'] = $order;
        }
        if ($insert_repeated) {
            parent::save($params, $show_query);
        } else {
            $check = self::get_field_option_by_field_and_option(
                $field_id,
                $params['option_value']
            );
            if ($check == false) {
                parent::save($params, $show_query);
            }
        }

        return true;
    }

    /**
     * Get the complete row of a specific option of a specific field
     * @param int $field_id
     * @param string $option_value Value of the option
     * @return mixed The row on success or false on failure
     * @assert (0,'') === false
     */
    public function get_field_option_by_field_and_option($field_id, $option_value)
    {
        $field_id = intval($field_id);
        $option_value = Database::escape_string($option_value);
        $extraFieldType = $this->getExtraField()->getExtraFieldType();

        $sql = "SELECT s.* FROM {$this->table} s
                INNER JOIN {$this->tableExtraField} sf
                ON (s.field_id = sf.id)
                WHERE
                    field_id = $field_id AND
                    option_value = '".$option_value."' AND
                    sf.extra_field_type = ".$extraFieldType."
                ";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return Database::store_result($result, 'ASSOC');
        }

        return false;
    }

    /**
     * Get the complete row of a specific option's display text of a specific field
     * @param int $field_id
     * @param string $option_display_text Display value of the option
     * @return mixed The row on success or false on failure
     * @assert (0, '') === false
     */
    public function get_field_option_by_field_id_and_option_display_text($field_id, $option_display_text)
    {
        $field_id = intval($field_id);
        $option_display_text = Database::escape_string($option_display_text);
        $extraFieldType = $this->getExtraField()->getExtraFieldType();

        $sql = "SELECT s.* FROM {$this->table} s
                INNER JOIN {$this->tableExtraField} sf
                ON (s.field_id = sf.id)
                WHERE
                    field_id = $field_id AND
                    s.display_text = '".$option_display_text."' AND
                    sf.extra_field_type = ".$extraFieldType."
                ";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return Database::fetch_array($result, 'ASSOC');
        }

        return false;
    }

    /**
     * Get the complete row of a specific option's display text of a specific field
     * @param int $field_id
     * @param string $option_display_text Display value of the option
     * @param string $option_value Value of the option
     *
     * @return mixed The row on success or false on failure
     * @assert (0, '', '') === false
     */
    public function getFieldOptionByFieldIdAndOptionDisplayTextAndOptionValue(
        $field_id,
        $option_display_text,
        $option_value
    ) {
        $field_id = intval($field_id);
        $option_display_text = Database::escape_string($option_display_text);
        $option_value = Database::escape_string($option_value);
        $extraFieldType = $this->getExtraField()->getExtraFieldType();

        $sql = "SELECT s.* FROM {$this->table} s
                INNER JOIN {$this->tableExtraField} sf
                ON (s.field_id = sf.id)
                WHERE
                    field_id = $field_id AND
                    sf.display_text = '".$option_display_text."' AND
                    option_value = '$option_value' AND
                    sf.extra_field_type = ".$extraFieldType."
                ";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return Database::fetch_array($result, 'ASSOC');
        }

        return false;
    }

    /**
     * Gets an array of options for a specific field
     * @param int $field_id The field ID
     * @param bool $add_id_in_array Whether to add the row ID in the result
     * @param string $ordered_by Extra ordering query bit
     * @result mixed Row on success, false on failure
     * @assert (0, '') === false
     */
    public function get_field_options_by_field($field_id, $add_id_in_array = false, $ordered_by = null)
    {
        $field_id = intval($field_id);

        $sql = "SELECT * FROM {$this->table}
                WHERE field_id = $field_id ";

        if (!empty($ordered_by)) {
            $sql .= " ORDER BY $ordered_by ";
        }

        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            if ($add_id_in_array) {
                $options = array();
                while ($row = Database::fetch_array($result, 'ASSOC')) {
                    $options[$row['id']] = $row;
                }

                return $options;
            } else {
                return Database::store_result($result, 'ASSOC');
            }
        }

        return false;
    }

    /**
     * Get options for a specific field as array or in JSON format suited for the double-select format
     * @param int $field_id
     * @param int $option_value_id Option value ID
     * @param bool $to_json Return format (whether it should be formatted to JSON or not)
     * @return mixed Row/JSON on success
     */
    public function get_second_select_field_options_by_field($field_id, $option_value_id, $to_json = false)
    {
        $field_id = intval($field_id);
        $option_value_id = intval($option_value_id);
        $options = array();
        $sql = "SELECT * FROM {$this->table}
                WHERE field_id = $field_id AND option_value = $option_value_id
                ORDER BY display_text";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            $options = Database::store_result($result, 'ASSOC');
        }

        if ($to_json) {
            $string = null;
            if (!empty($options)) {
                $array = array();
                foreach ($options as $option) {
                    $array[$option['id']] = $option['display_text'];
                }
                $string = json_encode($array);
            }

            return $string;
        }

        return $options;
    }

    /**
     * Get options for a specific field as string split by ;
     * @param int $field_id
     * @param string $ordered_by Extra query bit for reordering
     * @return string HTML string of options
     * @assert (0, '') === null
     */
    public function get_field_options_by_field_to_string($field_id, $ordered_by = null)
    {
        $field = new ExtraField($this->type);
        $field_info = $field->get($field_id);
        $options = self::get_field_options_by_field($field_id, false, $ordered_by);
        $elements = array();
        if (!empty($options)) {
            switch ($field_info['field_type']) {
                case ExtraField::FIELD_TYPE_DOUBLE_SELECT:
                    $html = ExtraField::extra_field_double_select_convert_array_to_string($options);
                    break;
                default:
                    foreach ($options as $option) {
                        $elements[] = $option['option_value'];
                    }
                    $html = implode(';', $elements);
                    break;
            }

            return $html;
        }

        return null;
    }

    /**
     * Get the maximum order value for a specific field
     * @param int $field_id
     * @return int Current max ID + 1 (we start from 0)
     * @assert (0, '') === 1
     */
    public function get_max_order($field_id)
    {
        $field_id = intval($field_id);
        $sql = "SELECT MAX(option_order)
                FROM {$this->table}
                WHERE field_id = $field_id";
        $res = Database::query($sql);
        $max = 1;
        if (Database::num_rows($res) > 0) {
            $row = Database::fetch_array($res);
            $max = $row[0] + 1;
        }

        return $max;
    }

    /**
     * Update the option using the given params
     * @param array $params data to be saved
     */
    public function update($params)
    {
        parent::update($params);
    }

    /**
     * Display a form with the options for the field_id given in REQUEST
     * @return void Prints output
     */
    public function display()
    {
        // action links
        echo '<div class="actions">';
        $field_id = isset($_REQUEST['field_id']) ? intval($_REQUEST['field_id']) : null;
        echo '<a href="'.api_get_self().'?action=add&type='.$this->type.'&field_id='.$field_id.'">'.
                Display::return_icon('add_user_fields.png', get_lang('Add'), '', ICON_SIZE_MEDIUM ).'</a>';
        echo '</div>';
        echo Display::grid_html('extra_field_options');
    }

    /**
     * @return array
     */
    public function getPriorityOptions()
    {
        return  array(
            '' => get_lang('SelectAnOption'),
            1 => get_lang('Success'),
            2 => get_lang('Info'),
            3 => get_lang('Warning'),
            4 => get_lang('Error'),
        );
    }

    /**
     * @param $priority
     * @return null|string
     */
    public function getPriorityMessageType($priority)
    {
        switch ($priority) {
            case 1:
                return 'success';
            case 2:
                return 'info';
            case 3:
                return 'warning';
            case 4:
                return 'error';
        }

        return null;
    }

    /**
     * Returns an HTML form for the current field
     * @param string URL to send the form to (action=...)
     * @param string Type of action to offer through the form (edit, usually)
     *
     * @return FormValidator
     */
    public function return_form($url, $action)
    {
        $form_name = $this->type.'_field';
        $form = new FormValidator($form_name, 'post', $url);
        // Setting the form elements
        $header = get_lang('Add');
        if ($action == 'edit') {
            $header = get_lang('Modify');
        }

        $form->addElement('header', $header);
        $id = isset($_GET['id']) ? intval($_GET['id']) : '';

        $form->addElement('hidden', 'id', $id);
        $form->addElement('hidden', 'type', $this->type);
        $form->addElement('hidden', 'field_id', $this->field_id);

        $form->addElement('text', 'display_text', get_lang('Name'));
        $form->addElement('text', 'option_value', get_lang('Value'));
        $form->addElement('text', 'option_order', get_lang('Order'));
        $form->addElement('select', 'priority', get_lang('Priority'), $this->getPriorityOptions());
        $form->addElement('textarea', 'priority_message', get_lang('PriorityOfMessage'));

        $defaults = array();

        if ($action == 'edit') {
            // Setting the defaults
            $defaults = $this->get($id);
            $form->freeze('option_value');
            $form->addButtonUpdate(get_lang('Modify'));
        } else {
            $form->addButtonCreate(get_lang('Add'));
        }

        $form->setDefaults($defaults);

        // Setting the rules
        $form->addRule('display_text', get_lang('ThisFieldIsRequired'), 'required');
        $form->addRule('option_value', get_lang('ThisFieldIsRequired'), 'required');

        return $form;
    }

    /**
     * @param string $tag
     * @param int $field_id
     * @param int $limit
     * @return array
     */
    public function searchByField($tag, $field_id, $limit = 10)
    {
        $field_id = intval($field_id);
        $limit = intval($limit);
        $tag = Database::escape_string($tag);
        $sql = "SELECT DISTINCT id, option_display_text
                FROM {$this->table}
                WHERE
                    field_id = '".$field_id."' AND
                    option_value LIKE '%$tag%'
                ORDER BY option_value
                LIMIT 0, $limit
                ";
        $result = Database::query($sql);
        $values = array();
        if (Database::num_rows($result)) {
            $values = Database::store_result($result, 'ASSOC');
        }
        return $values;
    }


    /**
     * @param string $tag
     * @param int $field_id
     * @param int $limit
     *
     * @return string
     */
    public function getSearchOptionsByField($tag, $field_id, $limit = 10)
    {
        $result = $this->searchByField($tag, $field_id, $limit = 10);
        $values = array();
        $json = null;
        if (!empty($result)) {
            foreach ($result as $item) {
                $values[] = array(
                    'value' => $item['id'],
                    'caption' => $item['option_display_text'],
                );
            }
            $json = json_encode($values);
        }

        return $json;
    }
}