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

/**
 * Class LegalManager.
 */
class LegalManager
{
    /**
     * Constructor.
     */
    public function __construct()
    {
    }

    /**
     * Add a new Term and Condition.
     *
     * @param int    $language               language id
     * @param string $content                content
     * @param int    $type                   term and condition type (0 for HTML text or 1 for link to another page)
     * @param string $changes                explain changes
     * @param array  $extraFieldValuesToSave
     *
     * @return int
     */
    public static function add($language, $content, $type, $changes, $extraFieldValuesToSave = [])
    {
        $legalTable = Database::get_main_table(TABLE_MAIN_LEGAL);
        $last = self::get_last_condition($language);
        $type = (int) $type;
        $time = time();

        $changeList = [];

        if (isset($last['id'])) {
            $id = $last['id'];

            // Check if extra fields changed
            $extraFieldValue = new ExtraFieldValue('terms_and_condition');
            $values = $extraFieldValue->getAllValuesByItem($id);
            $oldValues = array_column($values, 'value', 'variable');
            foreach ($extraFieldValuesToSave as $key => $value) {
                if (is_numeric(strpos($key, 'extra_'))) {
                    $replace = str_replace('extra_', '', $key);
                    if (isset($oldValues[$replace])) {
                        if ($value != $oldValues[$replace]) {
                            $changeList[] = $replace;
                        }
                    } else {
                        // It means there's a new extra field that was not included before.
                        $changeList[] = $replace;
                    }
                }
            }
        }

        if ($last['content'] != $content || !empty($changeList)) {
            $version = self::getLastVersion($language);
            $version++;
            $params = [
                'language_id' => $language,
                'content' => $content,
                'changes' => $changes,
                'type' => $type,
                'version' => $version,
                'date' => $time,
            ];

            $id = Database::insert($legalTable, $params);

            self::updateExtraFields($id, $extraFieldValuesToSave);

            return $id;
        } elseif ($last['type'] != $type && $language == $last['language_id']) {
            // Update
            $id = $last['id'];
            $params = [
                'changes' => $changes,
                'type' => $type,
                'date' => $time,
            ];
            Database::update($legalTable, $params, ['id = ?' => $id]);
            self::updateExtraFields($id, $extraFieldValuesToSave);

            return $id;
        }

        return 0;
    }

    /**
     * @param int   $itemId
     * @param array $values
     *
     * @return bool
     */
    public static function updateExtraFields($itemId, $values)
    {
        if (empty($itemId)) {
            return false;
        }
        $extraFieldValues = new ExtraFieldValue('terms_and_condition');
        $values['item_id'] = $itemId;
        $extraFieldValues->saveFieldValues($values);

        return true;
    }

    /**
     * @param int $id
     */
    public static function delete($id)
    {
        /*
        $legalTable = Database::get_main_table(TABLE_MAIN_LEGAL);
        $id = (int) $id;
        $sql = "DELETE FROM $legalTable WHERE id = '".$id."'";
        */
    }

    /**
     * Gets the last version of a Term and condition by language.
     *
     * @param int $language language id
     *
     * @return int
     */
    public static function getLastVersion($language)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $language = (int) $language;
        $sql = "SELECT version FROM $table
                WHERE language_id = $language
                ORDER BY id DESC LIMIT 1 ";
        $result = Database::query($sql);
        $row = Database::fetch_array($result);
        if (Database::num_rows($result) > 0) {
            return (int) $row['version'];
        }

        return 0;
    }

    /**
     * Gets the data of a Term and condition by language.
     *
     * @param int $language language id
     *
     * @return array all the info of a Term and condition
     */
    public static function get_last_condition($language)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $language = (int) $language;
        $sql = "SELECT * FROM $table
                WHERE language_id = $language
                ORDER BY version DESC
                LIMIT 1 ";
        $result = Database::query($sql);
        $result = Database::fetch_array($result, 'ASSOC');

        if (isset($result['content'])) {
            $result['content'] = self::replaceTags($result['content']);
        }

        return $result;
    }

    /**
     * Check if an specific version of an agreement exists.
     *
     * @param int $language
     * @param int $version
     *
     * @return bool
     */
    public static function hasVersion($language, $version)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $language = (int) $language;
        $version = (int) $version;

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

        $sql = "SELECT version FROM $table
                WHERE 
                    language_id = $language AND 
                    version = $version                
                LIMIT 1 ";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return true;
        }

        return false;
    }

    /**
     * @param string $content
     *
     * @return string
     */
    public static function replaceTags($content)
    {
        if (strpos($content, '{{sessions}}')) {
            $sessionListToString = '';
            $sessionList = SessionManager::get_sessions_by_user(api_get_user_id());
            if ($sessionList) {
                $sessionListToString = get_lang('Session list').'<ul>';
                foreach ($sessionList as $session) {
                    $sessionListToString .= '<li>'.$session['session_name'].'</li>';
                }
                $sessionListToString .= '<ul>';
            }
            $content = str_replace('{{sessions}}', $sessionListToString, $content);
        }

        return $content;
    }

    /**
     * Gets the last version of a Term and condition by language.
     *
     * @param int $language language id
     *
     * @return bool | int the version or false if does not exist
     */
    public static function get_last_version($language)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $language = (int) $language;
        $sql = "SELECT version FROM $table
                WHERE language_id = '$language'
                ORDER BY version DESC
                LIMIT 1 ";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            $version = Database::fetch_array($result);
            $version = explode(':', $version[0]);

            return $version[0];
        }

        return false;
    }

    /**
     * Show the last condition.
     *
     * @param array $term_preview with type and content i.e array('type'=>'1', 'content'=>'hola');
     *
     * @return string html preview
     */
    public static function show_last_condition($term_preview)
    {
        $preview = '';
        switch ($term_preview['type']) {
            case 0:
                if (!empty($term_preview['content'])) {
                    $preview = '<div class="terms-conditions">
                    <div id="legal-terms" class="scrollbar-inner">'.$term_preview['content'].'</div>
                    </div>';
                }
                $preview .= get_lang('By clicking on \'Register\' below you are agreeing to the Terms and Conditions');
                $courseInfo = api_get_course_info();
                if (api_get_setting('load_term_conditions_section') === 'course' && empty($courseInfo)) {
                    $preview = '';
                }
                break;
                // Page link
            case 1:
                $preview = '<fieldset>
                             <legend>'.get_lang('Terms and Conditions').'</legend>';
                $preview .= '<div id="legal-accept-wrapper" class="form-item">
                <label class="option" for="legal-accept">
                <input id="legal-accept" type="checkbox" value="1" name="legal_accept"/>
                '.get_lang('I have read and agree to the').'
                <a href="#">'.get_lang('Terms and Conditions').'</a>
                </label>
                </div>
                </fieldset>';
                break;
            default:
                break;
        }

        return $preview;
    }

    /**
     * Get the terms and condition table (only for maintenance).
     *
     * @param int $from
     * @param int $number_of_items
     * @param int $column
     *
     * @return array
     */
    public static function get_legal_data($from, $number_of_items, $column)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $lang_table = Database::get_main_table(TABLE_MAIN_LANGUAGE);
        $from = (int) $from;
        $number_of_items = (int) $number_of_items;
        $column = (int) $column;

        $sql = "SELECT version, original_name as language, content, changes, type, FROM_UNIXTIME(date)
                FROM $table 
                INNER JOIN $lang_table l
                ON (language_id = l.id) 
                ORDER BY language, version ASC 
                LIMIT $from, $number_of_items ";

        $result = Database::query($sql);
        $legals = [];
        while ($legal = Database::fetch_array($result)) {
            // max 2000 chars
            $languages[] = $legal[1];
            if (strlen($legal[2]) > 2000) {
                $legal[2] = substr($legal[2], 0, 2000).' ... ';
            }
            if ($legal[4] == 0) {
                $legal[4] = get_lang('HTML');
            } elseif ($legal[4] == 1) {
                $legal[4] = get_lang('Page Link');
            }
            $legals[] = $legal;
        }

        return $legals;
    }

    /**
     * Gets the number of terms and conditions available.
     *
     * @return int
     */
    public static function count()
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $sql = "SELECT count(*) as count_result
                FROM $table
                ORDER BY id DESC ";
        $result = Database::query($sql);
        $url = Database::fetch_array($result, 'ASSOC');
        $result = $url['count_result'];

        return $result;
    }

    /**
     * Get type of terms and conditions.
     * Type 0 is HTML Text
     * Type 1 is a link to a different terms and conditions page.
     *
     * @param int $legal_id
     * @param int $language_id
     *
     * @return mixed The current type of terms and conditions (int) or false on error
     */
    public static function get_type_of_terms_and_conditions($legal_id, $language_id)
    {
        $table = Database::get_main_table(TABLE_MAIN_LEGAL);
        $legal_id = (int) $legal_id;
        $language_id = (int) $language_id;
        $sql = "SELECT type FROM $table
                WHERE id = $legal_id AND language_id = $language_id";
        $rs = Database::query($sql);

        return Database::result($rs, 0, 'type');
    }

    /**
     * @param int $userId
     */
    public static function sendLegal($userId)
    {
        $subject = get_lang('Your terms and conditions are ready to be signed');
        $content = sprintf(
            get_lang('Hello,<br />Your tutor sent you your terms and conditions. You can sign it following this URL: %s'),
            api_get_path(WEB_PATH)
        );
        MessageManager::send_message_simple($userId, $subject, $content);
        Display::addFlash(Display::return_message(get_lang('Sent')));

        $extraFieldValue = new ExtraFieldValue('user');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable($userId, 'termactivated');
        if ($value === false) {
            $extraFieldInfo = $extraFieldValue->getExtraField()->get_handler_field_info_by_field_variable('termactivated');
            if ($extraFieldInfo) {
                $newParams = [
                    'item_id' => $userId,
                    'field_id' => $extraFieldInfo['id'],
                    'value' => 1,
                    'comment' => '',
                ];
                $extraFieldValue->save($newParams);
            }
        }
    }

    /**
     * @param int $userId
     */
    public static function deleteLegal($userId)
    {
        $extraFieldValue = new ExtraFieldValue('user');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable($userId, 'legal_accept');
        $result = $extraFieldValue->delete($value['id']);
        if ($result) {
            Display::addFlash(Display::return_message(get_lang('Deleted')));
        }

        $value = $extraFieldValue->get_values_by_handler_and_field_variable(
            $userId,
            'termactivated'
        );
        if ($value) {
            $extraFieldValue->delete($value['id']);
        }
    }

    /**
     * @return array
     */
    public static function getTreatmentTypeList()
    {
        return  [
            'privacy_terms_collection' => 'collection',
            'privacy_terms_recording' => 'recording',
            'privacy_terms_organization' => 'organization',
            'privacy_terms_structure' => 'structure',
            'privacy_terms_conservation' => 'conservation',
            'privacy_terms_adaptation' => 'adaptation',
            'privacy_terms_extraction' => 'extraction',
            'privacy_terms_consultation' => 'consultation',
            'privacy_terms_usage' => 'usage',
            'privacy_terms_communication' => 'communication',
            'privacy_terms_interconnection' => 'interconnection',
            'privacy_terms_limitation' => 'limitation',
            'privacy_terms_deletion' => 'deletion',
            'privacy_terms_destruction' => 'destruction',
            'privacy_terms_profiling' => 'profiling',
        ];
    }
}