<?php

///////////////////////////////////////////////////////////////////////////
//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.org                                            //
//                                                                       //
// Copyright (C) 1999 onwards Martin Dougiamas  http://dougiamas.com     //
//                                                                       //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program is distributed in the hope that it will be useful,       //
// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
// GNU General Public License for more details:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

/**
 * Tests for the parts of ../filterlib.php that involve loading the configuration
 * from, and saving the configuration to, the database.
 *
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package moodlecore
 */

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
}

require_once($CFG->libdir . '/filterlib.php');

/**
 * Test functions that affect filter_active table with contextid = $syscontextid.
 */
class filter_active_global_test extends UnitTestCaseUsingDatabase {
    private $syscontextid;
    public static $includecoverage = array('lib/filterlib.php');

    public function setUp() {
        parent::setUp();

        // Make sure accesslib has cached a sensible system context object
        // before we switch to the test DB.
        $this->syscontextid = get_context_instance(CONTEXT_SYSTEM)->id;

        // Create the table we need and switch to test DB.
        $this->create_test_table('filter_active', 'lib');
        $this->switch_to_test_db();
    }

    private function assert_only_one_filter_globally($filter, $state) {
        $recs = $this->testdb->get_records('filter_active');
        $this->assertEqual(1, count($recs), 'More than one record returned %s.');
        $rec = reset($recs);
        $expectedrec = new stdClass;
        $expectedrec->filter = $filter;
        $expectedrec->contextid = $this->syscontextid;
        $expectedrec->active = $state;
        $expectedrec->sortorder = 1;
        $this->assert(new CheckSpecifiedFieldsExpectation($expectedrec), $rec);
    }

    private function assert_global_sort_order($filters) {
        $sortedfilters = $this->testdb->get_records_menu('filter_active',
                array('contextid' => $this->syscontextid), 'sortorder', 'sortorder,filter');
        $testarray = array();
        $index = 1;
        foreach($filters as $filter) {
            $testarray[$index++] = $filter;
        }
        $this->assertEqual($testarray, $sortedfilters);
    }

    public function test_set_filter_globally_on() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/name', TEXTFILTER_ON, 1);
        // Validate.
        $this->assert_only_one_filter_globally('filter/name', TEXTFILTER_ON);
    }

    public function test_set_filter_globally_off() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/name', TEXTFILTER_OFF, 1);
        // Validate.
        $this->assert_only_one_filter_globally('filter/name', TEXTFILTER_OFF);
    }

    public function test_set_filter_globally_disabled() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/name', TEXTFILTER_DISABLED, 1);
        // Validate.
        $this->assert_only_one_filter_globally('filter/name', TEXTFILTER_DISABLED);
    }

    public function test_global_config_exception_on_invalid_state() {
        // Setup fixture.
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_set_global_state('filter/name', 0, 1);
    }

    public function test_set_no_sortorder_clash() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/one', TEXTFILTER_DISABLED, 1);
        filter_set_global_state('filter/two', TEXTFILTER_DISABLED, 1);
        // Validate - should have pushed other filters down.
        $this->assert_global_sort_order(array('filter/two', 'filter/one'));
    }

    public function test_auto_sort_order_disabled() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/one', TEXTFILTER_DISABLED);
        filter_set_global_state('filter/two', TEXTFILTER_DISABLED);
        // Validate.
        $this->assert_global_sort_order(array('filter/one', 'filter/two'));
    }

    public function test_auto_sort_order_enabled() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/one', TEXTFILTER_ON);
        filter_set_global_state('filter/two', TEXTFILTER_OFF);
        // Validate.
        $this->assert_global_sort_order(array('filter/one', 'filter/two'));
    }

    public function test_auto_sort_order_mixed() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/0', TEXTFILTER_DISABLED);
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_DISABLED);
        filter_set_global_state('filter/3', TEXTFILTER_OFF);
        // Validate.
        $this->assert_global_sort_order(array('filter/1', 'filter/3', 'filter/0', 'filter/2'));
    }

    public function test_update_existing_dont_duplicate() {
        // Setup fixture.
        // Exercise SUT.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_global_state('filter/name', TEXTFILTER_OFF);
        // Validate.
        $this->assert_only_one_filter_globally('filter/name', TEXTFILTER_OFF);
    }

    public function test_sort_order_not_too_low() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_set_global_state('filter/2', TEXTFILTER_ON, 0);
    }

    public function test_sort_order_not_too_high() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_set_global_state('filter/2', TEXTFILTER_ON, 3);
    }

    public function test_update_reorder_down() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_ON);
        filter_set_global_state('filter/3', TEXTFILTER_ON);
        // Exercise SUT.
        filter_set_global_state('filter/2', TEXTFILTER_ON, 1);
        // Validate.
        $this->assert_global_sort_order(array('filter/2', 'filter/1', 'filter/3'));
    }

    public function test_update_reorder_up() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_ON);
        filter_set_global_state('filter/3', TEXTFILTER_ON);
        filter_set_global_state('filter/4', TEXTFILTER_ON);
        // Exercise SUT.
        filter_set_global_state('filter/2', TEXTFILTER_ON, 3);
        // Validate.
        $this->assert_global_sort_order(array('filter/1', 'filter/3', 'filter/2', 'filter/4'));
    }

    public function test_auto_sort_order_change_to_enabled() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_DISABLED);
        filter_set_global_state('filter/3', TEXTFILTER_DISABLED);
        // Exercise SUT.
        filter_set_global_state('filter/3', TEXTFILTER_ON);
        // Validate.
        $this->assert_global_sort_order(array('filter/1', 'filter/3', 'filter/2'));
    }

    public function test_auto_sort_order_change_to_disabled() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_ON);
        filter_set_global_state('filter/3', TEXTFILTER_DISABLED);
        // Exercise SUT.
        filter_set_global_state('filter/1', TEXTFILTER_DISABLED);
        // Validate.
        $this->assert_global_sort_order(array('filter/2', 'filter/1', 'filter/3'));
    }

    public function test_filter_get_global_states() {
        // Setup fixture.
        filter_set_global_state('filter/1', TEXTFILTER_ON);
        filter_set_global_state('filter/2', TEXTFILTER_OFF);
        filter_set_global_state('filter/3', TEXTFILTER_DISABLED);
        // Exercise SUT.
        $filters = filter_get_global_states();
        // Validate.
        $this->assertEqual(array(
            'filter/1' => (object) array('filter' => 'filter/1', 'active' => TEXTFILTER_ON, 'sortorder' => 1),
            'filter/2' => (object) array('filter' => 'filter/2', 'active' => TEXTFILTER_OFF, 'sortorder' => 2),
            'filter/3' => (object) array('filter' => 'filter/3', 'active' => TEXTFILTER_DISABLED, 'sortorder' => 3)
        ), $filters);
    }
}

/**
 * Test functions that affect filter_active table with contextid = $syscontextid.
 */
class filter_active_local_test extends UnitTestCaseUsingDatabase {
    public function setUp() {
        parent::setUp();

        // Create the table we need and switch to test DB.
        $this->create_test_table('filter_active', 'lib');
        $this->switch_to_test_db();
    }

    private function assert_only_one_local_setting($filter, $contextid, $state) {
        $recs = $this->testdb->get_records('filter_active');
        $this->assertEqual(1, count($recs), 'More than one record returned %s.');
        $rec = reset($recs);
        $expectedrec = new stdClass;
        $expectedrec->filter = $filter;
        $expectedrec->contextid = $contextid;
        $expectedrec->active = $state;
        $this->assert(new CheckSpecifiedFieldsExpectation($expectedrec), $rec);
    }

    private function assert_no_local_setting() {
        $this->assertEqual(0, $this->testdb->count_records('filter_active'));
    }

    public function test_local_on() {
        // Exercise SUT.
        filter_set_local_state('filter/name', 123, TEXTFILTER_ON);
        // Validate.
        $this->assert_only_one_local_setting('filter/name', 123, TEXTFILTER_ON);
    }

    public function test_local_off() {
        // Exercise SUT.
        filter_set_local_state('filter/name', 123, TEXTFILTER_OFF);
        // Validate.
        $this->assert_only_one_local_setting('filter/name', 123, TEXTFILTER_OFF);
    }

    public function test_local_inherit() {
        global $DB;
        // Exercise SUT.
        filter_set_local_state('filter/name', 123, TEXTFILTER_INHERIT);
        // Validate.
        $this->assert_no_local_setting();
    }

    public function test_local_invalid_state_throws_exception() {
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_set_local_state('filter/name', 123, -9999);
    }

    public function test_throws_exception_when_setting_global() {
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_set_local_state('filter/name', get_context_instance(CONTEXT_SYSTEM)->id, TEXTFILTER_INHERIT);
    }

    public function test_local_inherit_deletes_existing() {
        global $DB;
        // Setup fixture.
        filter_set_local_state('filter/name', 123, TEXTFILTER_INHERIT);
        // Exercise SUT.
        filter_set_local_state('filter/name', 123, TEXTFILTER_INHERIT);
        // Validate.
        $this->assert_no_local_setting();
    }
}

/**
 * Test functions that use just the filter_config table.
 */
class filter_config_test extends UnitTestCaseUsingDatabase {
    public function setUp() {
        parent::setUp();

        // Create the table we need and switch to test DB.
        $this->create_test_table('filter_config', 'lib');
        $this->switch_to_test_db();
    }

    private function assert_only_one_config($filter, $context, $name, $value) {
        $recs = $this->testdb->get_records('filter_config');
        $this->assertEqual(1, count($recs), 'More than one record returned %s.');
        $rec = reset($recs);
        $expectedrec = new stdClass;
        $expectedrec->filter = $filter;
        $expectedrec->contextid = $context;
        $expectedrec->name = $name;
        $expectedrec->value = $value;
        $this->assert(new CheckSpecifiedFieldsExpectation($expectedrec), $rec);
    }

    public function test_set_new_config() {
        // Exercise SUT.
        filter_set_local_config('filter/name', 123, 'settingname', 'An arbitrary value');
        // Validate.
        $this->assert_only_one_config('filter/name', 123, 'settingname', 'An arbitrary value');
    }

    public function test_update_existing_config() {
        // Setup fixture.
        filter_set_local_config('filter/name', 123, 'settingname', 'An arbitrary value');
        // Exercise SUT.
        filter_set_local_config('filter/name', 123, 'settingname', 'A changed value');
        // Validate.
        $this->assert_only_one_config('filter/name', 123, 'settingname', 'A changed value');
    }

    public function test_filter_get_local_config() {
        // Setup fixture.
        filter_set_local_config('filter/name', 123, 'setting1', 'An arbitrary value');
        filter_set_local_config('filter/name', 123, 'setting2', 'Another arbitrary value');
        filter_set_local_config('filter/name', 122, 'settingname', 'Value from another context');
        filter_set_local_config('filter/other', 123, 'settingname', 'Someone else\'s value');
        // Exercise SUT.
        $config = filter_get_local_config('filter/name', 123);
        // Validate.
        $this->assertEqual(array('setting1' => 'An arbitrary value', 'setting2' => 'Another arbitrary value'), $config);
    }
}

class filter_get_active_available_in_context_test extends UnitTestCaseUsingDatabase {
    private $syscontext;
    private $childcontext;
    private $childcontext2;

    public function setUp() {
        parent::setUp();

        // Create the table we need and switch to test DB.
        $this->create_test_tables(array('filter_active', 'filter_config', 'context', 'course_categories', 'course'), 'lib');
        $this->switch_to_test_db();
        // Nasty hack, recreate the system context record (the accesslib API does not allow to create it easily)
        $this->create_system_context_record();
        // Reset all caches
        accesslib_clear_all_caches_for_unit_testing();

        $this->syscontext = get_context_instance(CONTEXT_SYSTEM);

        // Set up a child context.
        $cat = new stdClass();
        $cat->name         = 'testcategory';
        $cat->parent       = 0;
        $cat->depth        = 1;
        $cat->sortorder    = 100;
        $cat->timemodified = time();
        $catid = $this->testdb->insert_record('course_categories', $cat);
        $this->testdb->set_field('course_categories', 'path', '/' . $catid, array('id' => $catid));
        $this->childcontext = context_coursecat::instance($catid);

        // Set up a grandchild context.
        $course = new stdClass();
        $course->fullname     = 'testcourse';
        $course->shortname    = 'tc';
        $course->summary      = 'testcourse summary';
        $course->newsitems    = 0;
        $course->numsections  = 1;
        $course->category     = $catid;
        $course->format       = 'topics';
        $course->timecreated  = time();
        $course->visible      = 1;
        $course->timemodified = $course->timecreated;
        $courseid = $this->testdb->insert_record('course', $course);
        $this->childcontext2 = context_course::instance($courseid);
    }

    private function assert_filter_list($expectedfilters, $filters) {
        $this->assert(new ArraysHaveSameValuesExpectation($expectedfilters), array_keys($filters));
    }

    public function test_globally_on_is_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->syscontext);
        // Validate.
        $this->assert_filter_list(array('filter/name'), $filters);
        // Check no config returned correctly.
        $this->assertEqual(array(), $filters['filter/name']);
    }

    public function test_globally_off_not_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_OFF);
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext2);
        // Validate.
        $this->assert_filter_list(array(), $filters);
    }

    public function test_globally_off_overridden() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_OFF);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_ON);
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext2);
        // Validate.
        $this->assert_filter_list(array('filter/name'), $filters);
    }

    public function test_globally_on_overridden() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_OFF);
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext2);
        // Validate.
        $this->assert_filter_list(array(), $filters);
    }

    public function test_globally_disabled_not_overridden() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_DISABLED);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_ON);
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->syscontext);
        // Validate.
        $this->assert_filter_list(array(), $filters);
    }

    public function test_single_config_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_config('filter/name', $this->childcontext->id, 'settingname', 'A value');
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext);
        // Validate.
        $this->assertEqual(array('settingname' => 'A value'), $filters['filter/name']);
    }

    public function test_multi_config_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_config('filter/name', $this->childcontext->id, 'settingname', 'A value');
        filter_set_local_config('filter/name', $this->childcontext->id, 'anothersettingname', 'Another value');
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext);
        // Validate.
        $this->assertEqual(array('settingname' => 'A value', 'anothersettingname' => 'Another value'), $filters['filter/name']);
    }

    public function test_config_from_other_context_not_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_config('filter/name', $this->childcontext->id, 'settingname', 'A value');
        filter_set_local_config('filter/name', $this->childcontext2->id, 'anothersettingname', 'Another value');
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext2);
        // Validate.
        $this->assertEqual(array('anothersettingname' => 'Another value'), $filters['filter/name']);
    }

    public function test_config_from_other_filter_not_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_config('filter/name', $this->childcontext->id, 'settingname', 'A value');
        filter_set_local_config('filter/other', $this->childcontext->id, 'anothersettingname', 'Another value');
        // Exercise SUT.
        $filters = filter_get_active_in_context($this->childcontext);
        // Validate.
        $this->assertEqual(array('settingname' => 'A value'), $filters['filter/name']);
    }

    protected function assert_one_available_filter($filter, $localstate, $inheritedstate, $filters) {
        $this->assertEqual(1, count($filters), 'More than one record returned %s.');
        $rec = $filters[$filter];
        $expectedrec = new stdClass;
        $expectedrec->filter = $filter;
        $expectedrec->localstate = $localstate;
        $expectedrec->inheritedstate = $inheritedstate;
        $this->assert(new CheckSpecifiedFieldsExpectation($expectedrec), $rec);
    }

    public function test_available_in_context_localoverride() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_OFF);
        // Exercise SUT.
        $filters = filter_get_available_in_context($this->childcontext);
        // Validate.
        $this->assert_one_available_filter('filter/name', TEXTFILTER_OFF, TEXTFILTER_ON, $filters);
    }

    public function test_available_in_context_nolocaloverride() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_OFF);
        // Exercise SUT.
        $filters = filter_get_available_in_context($this->childcontext2);
        // Validate.
        $this->assert_one_available_filter('filter/name', TEXTFILTER_INHERIT, TEXTFILTER_OFF, $filters);
    }

    public function test_available_in_context_disabled_not_returned() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_DISABLED);
        filter_set_local_state('filter/name', $this->childcontext->id, TEXTFILTER_ON);
        // Exercise SUT.
        $filters = filter_get_available_in_context($this->childcontext);
        // Validate.
        $this->assertEqual(array(), $filters);
    }

    public function test_available_in_context_exception_with_syscontext() {
        // Set expectation.
        $this->expectException();
        // Exercise SUT.
        filter_get_available_in_context($this->syscontext);
    }
}

class filter_preload_activities_test extends UnitTestCaseUsingDatabase {
    private $syscontext, $catcontext, $coursecontext, $activity1context, $activity2context;

    public function setUp() {
        parent::setUp();

        // Make sure accesslib has cached a sensible system context object
        // before we switch to the test DB.
        $this->syscontext = get_context_instance(CONTEXT_SYSTEM);

        // Create the table we need and switch to test DB.
        $this->create_test_tables(array('filter_active', 'filter_config', 'context',
            'course', 'course_categories', 'course_modules', 'modules', 'course_sections',
            'course_modules_availability', 'grade_items', 'cache_text'), 'lib');
        $this->create_test_tables(array('label'), 'mod/label');
        $this->switch_to_test_db();
        // Nasty hack, recreate the system context record (the accesslib API does not allow to create it easily)
        $this->create_system_context_record();
        // Reset all caches
        accesslib_clear_all_caches_for_unit_testing();

        $this->syscontext = get_context_instance(CONTEXT_SYSTEM);

        // Make the category
        $cat = new stdClass();
        $cat->name         = 'testcategory';
        $cat->parent       = 0;
        $cat->depth        = 1;
        $cat->sortorder    = 100;
        $cat->timemodified = time();
        $catid = $this->testdb->insert_record('course_categories', $cat);
        $this->testdb->set_field('course_categories', 'path', '/' . $catid, array('id' => $catid));
        $this->catcontext = context_coursecat::instance($catid);

        // Make the course
        $course = (object)array(
            'shortname' => 'TEST101');
        $courseid = $this->testdb->insert_record('course', $course);
        $this->coursecontext = context_course::instance($courseid);

        // Set up section
        $section = (object)array(
            'course' => $courseid);
        $section->id = $this->testdb->insert_record('course_sections', $section);

        // Make course-modules
        $mod = (object)array(
            'name' => 'label',
            'visible' => 1);
        $mod->id = $this->testdb->insert_record('modules', $mod);
        $label1 = (object)array(
            'course' => $courseid,
            'intro' => 'Intro 1',
            'name' => 'Label 1');
        $label1->id = $this->testdb->insert_record('label', $label1);
        $cm1 = (object)array(
            'course' => $courseid,
            'section' => $section->id,
            'module' => $mod->id,
            'instance' => $label1->id);
        $cm1->id = $this->testdb->insert_record('course_modules', $cm1);
        $this->activity1context = context_module::instance($cm1->id);

        $label2 = (object)array(
            'course' => $courseid,
            'intro' => 'Intro 2',
            'name' => 'Label 2');
        $label2->id = $this->testdb->insert_record('label', $label2);
        $cm2 = (object)array(
            'course' => $courseid,
            'section' => $section->id,
            'module' => $mod->id,
            'instance' => $label2->id);
        $cm2->id = $this->testdb->insert_record('course_modules', $cm2);
        $this->testdb->set_field('course_sections', 'sequence',
            "$cm1->id,$cm2->id", array('id' => $section->id));
        $this->activity2context = context_module::instance($cm2->id);
    }

    private function assert_matches($modinfo) {
        global $FILTERLIB_PRIVATE;

        // Use preload cache...
        $FILTERLIB_PRIVATE = new stdClass;
        filter_preload_activities($modinfo);

        // Get data and check no queries are made
        $before = $this->testdb->perf_get_reads();
        $plfilters1 = filter_get_active_in_context($this->activity1context);
        $plfilters2 = filter_get_active_in_context($this->activity2context);
        $after = $this->testdb->perf_get_reads();
        $this->assertEqual($before, $after);

        // Repeat without cache and check it makes queries now
        $FILTERLIB_PRIVATE = new stdClass;
        $before = $this->testdb->perf_get_reads();
        $filters1 = filter_get_active_in_context($this->activity1context);
        $filters2 = filter_get_active_in_context($this->activity2context);
        $after = $this->testdb->perf_get_reads();
        $this->assertTrue($after > $before);

        // Check they match
        $this->assertEqual($plfilters1, $filters1);
        $this->assertEqual($plfilters2, $filters2);
    }

    public function test_preload() {
        global $FILTERLIB_PRIVATE;

        // Get course and modinfo
        $course = $this->testdb->get_record('course', array('id'=>1));
        $modinfo = new course_modinfo($course, 1);

        // Note: All the tests in this function check that the result from the
        // preloaded cache is the same as the result from calling the standard
        // function without preloading.

        // Initially, check with no filters enabled
        $this->assert_matches($modinfo);

        // Enable filter globally, check
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        $this->assert_matches($modinfo);

        // Disable for activity 2
        filter_set_local_state('filter/name', $this->activity2context->id, TEXTFILTER_OFF);
        $this->assert_matches($modinfo);

        // Disable at category
        filter_set_local_state('filter/name', $this->catcontext->id, TEXTFILTER_OFF);
        $this->assert_matches($modinfo);

        // Enable for activity 1
        filter_set_local_state('filter/name', $this->activity1context->id, TEXTFILTER_ON);
        $this->assert_matches($modinfo);

        // Disable globally
        filter_set_global_state('filter/name', TEXTFILTER_DISABLED);
        $this->assert_matches($modinfo);

        // Add another 2 filters
        filter_set_global_state('filter/frog', TEXTFILTER_ON);
        filter_set_global_state('filter/zombie', TEXTFILTER_ON);
        $this->assert_matches($modinfo);

        // Disable random one of these in each context
        filter_set_local_state('filter/zombie', $this->activity1context->id, TEXTFILTER_OFF);
        filter_set_local_state('filter/frog', $this->activity2context->id, TEXTFILTER_OFF);
        $this->assert_matches($modinfo);

        // Now do some filter options
        filter_set_local_config('filter/name', $this->activity1context->id, 'a', 'x');
        filter_set_local_config('filter/zombie', $this->activity1context->id, 'a', 'y');
        filter_set_local_config('filter/frog', $this->activity1context->id, 'a', 'z');
        // These last two don't do anything as they are not at final level but I
        // thought it would be good to have that verified in test
        filter_set_local_config('filter/frog', $this->coursecontext->id, 'q', 'x');
        filter_set_local_config('filter/frog', $this->catcontext->id, 'q', 'z');
        $this->assert_matches($modinfo);
    }
}

class filter_delete_config_test extends UnitTestCaseUsingDatabase {
    protected $syscontext;

    public function setUp() {
        parent::setUp();

        $this->syscontext = get_context_instance(CONTEXT_SYSTEM);

        // Create the table we need and switch to test DB.
        $this->create_test_tables(array('filter_active', 'filter_config', 'config', 'config_plugins'), 'lib');
        $this->switch_to_test_db();
    }

    public function test_filter_delete_all_for_filter() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_global_state('filter/other', TEXTFILTER_ON);
        filter_set_local_config('filter/name', $this->syscontext->id, 'settingname', 'A value');
        filter_set_local_config('filter/other', $this->syscontext->id, 'settingname', 'Other value');
        set_config('configname', 'A config value', 'filter_name');
        set_config('configname', 'Other config value', 'filter_other');
        // Exercise SUT.
        filter_delete_all_for_filter('filter/name');
        // Validate.
        $this->assertEqual(1, $this->testdb->count_records('filter_active'));
        $this->assertTrue($this->testdb->record_exists('filter_active', array('filter' => 'filter/other')));
        $this->assertEqual(1, $this->testdb->count_records('filter_config'));
        $this->assertTrue($this->testdb->record_exists('filter_config', array('filter' => 'filter/other')));
        $expectedconfig = new stdClass;
        $expectedconfig->configname = 'Other config value';
        $this->assertEqual($expectedconfig, get_config('filter_other'));
        $this->assertIdentical(get_config('filter_name'), new stdClass());
    }

    public function test_filter_delete_all_for_context() {
        // Setup fixture.
        filter_set_global_state('filter/name', TEXTFILTER_ON);
        filter_set_local_state('filter/name', 123, TEXTFILTER_OFF);
        filter_set_local_config('filter/name', 123, 'settingname', 'A value');
        filter_set_local_config('filter/other', 123, 'settingname', 'Other value');
        filter_set_local_config('filter/other', 122, 'settingname', 'Other value');
        // Exercise SUT.
        filter_delete_all_for_context(123);
        // Validate.
        $this->assertEqual(1, $this->testdb->count_records('filter_active'));
        $this->assertTrue($this->testdb->record_exists('filter_active', array('contextid' => $this->syscontext->id)));
        $this->assertEqual(1, $this->testdb->count_records('filter_config'));
        $this->assertTrue($this->testdb->record_exists('filter_config', array('filter' => 'filter/other')));
    }
}

class filter_filter_set_applies_to_strings extends UnitTestCaseUsingDatabase {
    protected $origcfgstringfilters;
    protected $origcfgfilterall;

    public function setUp() {
        global $CFG;
        parent::setUp();

        // Create the table we need and switch to test DB.
        $this->create_test_table('config', 'lib');
        $this->switch_to_test_db();

        // Store original $CFG;
        $this->origcfgstringfilters = $CFG->stringfilters;
        $this->origcfgfilterall = $CFG->filterall;
    }

    public function tearDown() {
        global $CFG;
        $CFG->stringfilters = $this->origcfgstringfilters;
        $CFG->filterall = $this->origcfgfilterall;

        parent::tearDown();
    }

    public function test_set() {
        global $CFG;
        // Setup fixture.
        $CFG->filterall = 0;
        $CFG->stringfilters = '';
        // Exercise SUT.
        filter_set_applies_to_strings('filter/name', true);
        // Validate.
        $this->assertEqual('filter/name', $CFG->stringfilters);
        $this->assertTrue($CFG->filterall);
    }

    public function test_unset_to_empty() {
        global $CFG;
        // Setup fixture.
        $CFG->filterall = 1;
        $CFG->stringfilters = 'filter/name';
        // Exercise SUT.
        filter_set_applies_to_strings('filter/name', false);
        // Validate.
        $this->assertEqual('', $CFG->stringfilters);
        $this->assertFalse($CFG->filterall);
    }

    public function test_unset_multi() {
        global $CFG;
        // Setup fixture.
        $CFG->filterall = 1;
        $CFG->stringfilters = 'filter/name,filter/other';
        // Exercise SUT.
        filter_set_applies_to_strings('filter/name', false);
        // Validate.
        $this->assertEqual('filter/other', $CFG->stringfilters);
        $this->assertTrue($CFG->filterall);
    }
}