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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Base class for unit tests for core_cohort.
 *
 * @package    core_cohort
 * @category   test
 * @copyright  2018 Sara Arjona <sara@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

use core_cohort\privacy\provider;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\writer;
use core_privacy\tests\provider_testcase;
use core_privacy\local\request\approved_userlist;

/**
 * Unit tests for cohort\classes\privacy\provider.php
 *
 * @copyright  2018 Sara Arjona <sara@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class core_cohort_testcase extends provider_testcase {

/**
     * Basic setup for these tests.
     */
    public function setUp() {
        $this->resetAfterTest(true);
    }

/**
     * Test getting the context for the user ID related to this plugin.
     */
    public function test_get_contexts_for_userid() {
        // Create system cohort and category cohort.
        $coursecategory = $this->getDataGenerator()->create_category();
        $coursecategoryctx = \context_coursecat::instance($coursecategory->id);
        $systemctx = \context_system::instance();
        $categorycohort = $this->getDataGenerator()->create_cohort([
                'contextid' => $coursecategoryctx->id,
                'name' => 'Category cohort 1',
            ]);
        $systemcohort = $this->getDataGenerator()->create_cohort([
                'contextid' => $systemctx->id,
                'name' => 'System cohort 1'
            ]);

// Create user and add to the system and category cohorts.
        $user = $this->getDataGenerator()->create_user();
        cohort_add_member($categorycohort->id, $user->id);
        cohort_add_member($systemcohort->id, $user->id);

// User is member of 2 cohorts.
        $contextlist = provider::get_contexts_for_userid($user->id);
        $this->assertCount(2, (array) $contextlist->get_contextids());
        $this->assertContains($coursecategoryctx->id, $contextlist->get_contextids());
        $this->assertContains($systemctx->id, $contextlist->get_contextids());
    }

/**
     * Test that data is exported correctly for this plugin.
     */
    public function test_export_user_data() {
        // Create system cohort and category cohort.
        $coursecategory = $this->getDataGenerator()->create_category();
        $coursecategoryctx = \context_coursecat::instance($coursecategory->id);
        $systemctx = \context_system::instance();
        $categorycohort = $this->getDataGenerator()->create_cohort([
                'contextid' => $coursecategoryctx->id,
                'name' => 'Category cohort 1',
            ]);
        $systemcohort1 = $this->getDataGenerator()->create_cohort([
                'contextid' => $systemctx->id,
                'name' => 'System cohort 1'
            ]);
        $systemcohort2 = $this->getDataGenerator()->create_cohort([
                'contextid' => $systemctx->id,
                'name' => 'System cohort 2'
            ]);

// Validate system cohort exported data.
        $writer = writer::with_context($systemctx);
        $this->assertFalse($writer->has_any_data());
        $this->export_context_data_for_user($user->id, $systemctx, 'core_cohort');
        $data = $writer->get_related_data([], 'cohort');
        $this->assertCount(2, $data);

// Validate category cohort exported data.
        $writer = writer::with_context($coursecategoryctx);
        $this->assertFalse($writer->has_any_data());
        $this->export_context_data_for_user($user->id, $coursecategoryctx, 'core_cohort');
        $data = $writer->get_related_data([], 'cohort');
        $this->assertCount(1, $data);
        $this->assertEquals($categorycohort->name, reset($data)->name);
    }

/**
     * Test for provider::delete_data_for_all_users_in_context().
     */
    public function test_delete_data_for_all_users_in_context() {
        global $DB;

// Create system cohort and category cohort.
        $coursecategory = $this->getDataGenerator()->create_category();
        $coursecategoryctx = \context_coursecat::instance($coursecategory->id);
        $systemctx = \context_system::instance();
        $categorycohort = $this->getDataGenerator()->create_cohort([
                'contextid' => $coursecategoryctx->id,
                'name' => 'Category cohort 1',
                'idnumber' => '',
                'description' => ''
            ]);
        $systemcohort = $this->getDataGenerator()->create_cohort([
                'contextid' => $systemctx->id,
                'name' => 'System cohort 1'
            ]);

// Before deletion, we should have 2 entries in the cohort_members table.
        $count = $DB->count_records('cohort_members');
        $this->assertEquals(2, $count);

// Delete data based on system context.
        provider::delete_data_for_all_users_in_context($systemctx);

// After deletion, the cohort_members entries should have been deleted.
        $count = $DB->count_records('cohort_members');
        $this->assertEquals(1, $count);

// Delete data based on category context.
        provider::delete_data_for_all_users_in_context($coursecategoryctx);

// After deletion, the cohort_members entries should have been deleted.
        $count = $DB->count_records('cohort_members');
        $this->assertEquals(0, $count);
    }

/**
     * Test for provider::delete_data_for_user().
     */
    public function test_delete_data_for_user() {
        global $DB;

// Create user and add to the system and category cohorts.
        $user1 = $this->getDataGenerator()->create_user();
        cohort_add_member($categorycohort->id, $user1->id);
        cohort_add_member($systemcohort->id, $user1->id);

// Create another user and add to the system and category cohorts.
        $user2 = $this->getDataGenerator()->create_user();
        cohort_add_member($categorycohort->id, $user2->id);
        cohort_add_member($systemcohort->id, $user2->id);

// Create another user and add to the system cohort.
        $user3 = $this->getDataGenerator()->create_user();
        cohort_add_member($systemcohort->id, $user3->id);

// Before deletion, we should have 5 entries in the cohort_members table.
        $count = $DB->count_records('cohort_members');
        $this->assertEquals(5, $count);

$contextlist = provider::get_contexts_for_userid($user1->id);
        $contexts = [];
        $contexts[] = \context_user::instance($user1->id)->id;
        $contexts = array_merge($contexts, $contextlist->get_contextids());
        $approvedcontextlist = new approved_contextlist($user1, 'cohort', $contexts);
        provider::delete_data_for_user($approvedcontextlist);

// After deletion, the cohort_members entries for the first student should have been deleted.
        $count = $DB->count_records('cohort_members', ['userid' => $user1->id]);
        $this->assertEquals(0, $count);
        $count = $DB->count_records('cohort_members');
        $this->assertEquals(3, $count);

// Confirm that the cohorts hasn't been removed.
        $cohortscount = $DB->get_records('cohort');
        $this->assertCount(2, (array) $cohortscount);
    }

/**
     * Test that only users within a course context are fetched.
     */
    public function test_get_users_in_context() {
        $component = 'core_cohort';

// Create system cohort and category cohort.
        $coursecategory = $this->getDataGenerator()->create_category();
        $coursecategoryctx = \context_coursecat::instance($coursecategory->id);
        $systemctx = \context_system::instance();
        $categorycohort = $this->getDataGenerator()->create_cohort([
            'contextid' => $coursecategoryctx->id,
            'name' => 'Category cohort 1',
        ]);
        // Create user.
        $user = $this->getDataGenerator()->create_user();
        $userctx = \context_user::instance($user->id);

$userlist1 = new \core_privacy\local\request\userlist($coursecategoryctx, $component);
        provider::get_users_in_context($userlist1);
        $this->assertCount(0, $userlist1);

$userlist2 = new \core_privacy\local\request\userlist($systemctx, $component);
        provider::get_users_in_context($userlist2);
        $this->assertCount(0, $userlist2);

$systemcohort = $this->getDataGenerator()->create_cohort([
            'contextid' => $systemctx->id,
            'name' => 'System cohort 1'
        ]);
        // Create user and add to the system and category cohorts.
        cohort_add_member($categorycohort->id, $user->id);
        cohort_add_member($systemcohort->id, $user->id);

// The list of users within the coursecat context should contain user.
        $userlist1 = new \core_privacy\local\request\userlist($coursecategoryctx, $component);
        provider::get_users_in_context($userlist1);
        $this->assertCount(1, $userlist1);
        $expected = [$user->id];
        $actual = $userlist1->get_userids();
        $this->assertEquals($expected, $actual);

// The list of users within the system context should contain user.
        $userlist2 = new \core_privacy\local\request\userlist($systemctx, $component);
        provider::get_users_in_context($userlist2);
        $this->assertCount(1, $userlist2);
        $expected = [$user->id];
        $actual = $userlist2->get_userids();
        $this->assertEquals($expected, $actual);

// The list of users within the user context should be empty.
        $userlist3 = new \core_privacy\local\request\userlist($userctx, $component);
        provider::get_users_in_context($userlist3);
        $this->assertCount(0, $userlist3);
    }

/**
     * Test that data for users in approved userlist is deleted.
     */
    public function test_delete_data_for_users() {
        $component = 'core_cohort';

// Create system cohort and category cohort.
        $coursecategory = $this->getDataGenerator()->create_category();
        $coursecategoryctx = \context_coursecat::instance($coursecategory->id);
        $systemctx = \context_system::instance();
        $categorycohort = $this->getDataGenerator()->create_cohort([
            'contextid' => $coursecategoryctx->id,
            'name' => 'Category cohort 1',
        ]);
        // Create user1.
        $user1 = $this->getDataGenerator()->create_user();
        $userctx1 = \context_user::instance($user1->id);
        // Create user2.
        $user2 = $this->getDataGenerator()->create_user();

$systemcohort = $this->getDataGenerator()->create_cohort([
            'contextid' => $systemctx->id,
            'name' => 'System cohort 1'
        ]);
        // Create user and add to the system and category cohorts.
        cohort_add_member($categorycohort->id, $user1->id);
        cohort_add_member($systemcohort->id, $user1->id);
        cohort_add_member($categorycohort->id, $user2->id);

$userlist1 = new \core_privacy\local\request\userlist($coursecategoryctx, $component);
        provider::get_users_in_context($userlist1);
        $this->assertCount(2, $userlist1);

$userlist2 = new \core_privacy\local\request\userlist($systemctx, $component);
        provider::get_users_in_context($userlist2);
        $this->assertCount(1, $userlist2);

// Convert $userlist1 into an approved_contextlist.
        $approvedlist1 = new approved_userlist($coursecategoryctx, $component, $userlist1->get_userids());
        // Delete using delete_data_for_user.
        provider::delete_data_for_users($approvedlist1);

// Re-fetch users in coursecategoryctx.
        $userlist1 = new \core_privacy\local\request\userlist($coursecategoryctx, $component);
        provider::get_users_in_context($userlist1);
        // The user data in coursecategoryctx should be deleted.
        $this->assertCount(0, $userlist1);
        // Re-fetch users in coursecategoryctx.
        $userlist2 = new \core_privacy\local\request\userlist($systemctx, $component);
        provider::get_users_in_context($userlist2);
        // The user data in coursecontext2 should be still present.
        $this->assertCount(1, $userlist2);

// Convert $userlist2 into an approved_contextlist in the user context.
        $approvedlist3 = new approved_userlist($userctx1, $component, $userlist2->get_userids());
        // Delete using delete_data_for_user.
        provider::delete_data_for_users($approvedlist3);
        // Re-fetch users in coursecontext1.
        $userlist3 = new \core_privacy\local\request\userlist($systemctx, $component);
        provider::get_users_in_context($userlist3);
        // The user data in systemcontext should not be deleted.
        $this->assertCount(1, $userlist3);
    }
}