<?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/>.

namespace mod_forum;

/**
 * PHPUnit data generator testcase
 *
 * @package    mod_forum
 * @category   test
 * @copyright  2012 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @covers \mod_forum_generator
 */
final class generator_test extends \advanced_testcase {
    public function setUp(): void {
        parent::setUp();
        // We must clear the subscription caches. This has to be done both before each test, and after in case of other
        // tests using these functions.
        \mod_forum\subscriptions::reset_forum_cache();
    }

    public function tearDown(): void {
        // We must clear the subscription caches. This has to be done both before each test, and after in case of other
        // tests using these functions.
        \mod_forum\subscriptions::reset_forum_cache();
        parent::tearDown();
    }

    public function test_generator(): void {
        global $DB;

        $this->resetAfterTest(true);

        $this->assertEquals(0, $DB->count_records('forum'));

        $course = $this->getDataGenerator()->create_course();

        /** @var mod_forum_generator $generator */
        $generator = $this->getDataGenerator()->get_plugin_generator('mod_forum');
        $this->assertInstanceOf('mod_forum_generator', $generator);
        $this->assertEquals('forum', $generator->get_modulename());

        $generator->create_instance(['course' => $course->id]);
        $generator->create_instance(['course' => $course->id]);
        $forum = $generator->create_instance(['course' => $course->id]);
        $this->assertEquals(3, $DB->count_records('forum'));

        $cm = get_coursemodule_from_instance('forum', $forum->id);
        $this->assertEquals($forum->id, $cm->instance);
        $this->assertEquals('forum', $cm->modname);
        $this->assertEquals($course->id, $cm->course);

        $context = \context_module::instance($cm->id);
        $this->assertEquals($forum->cmid, $context->instanceid);

        // Test gradebook integration using low level DB access - DO NOT USE IN PLUGIN CODE.
        $forum = $generator->create_instance(['course' => $course->id, 'assessed' => 1, 'scale' => 100]);
        $gitem = $DB->get_record(
            'grade_items',
            ['courseid' => $course->id, 'itemtype' => 'mod', 'itemmodule' => 'forum', 'iteminstance' => $forum->id]
        );
        $this->assertNotEmpty($gitem);
        $this->assertEquals(100, $gitem->grademax);
        $this->assertEquals(0, $gitem->grademin);
        $this->assertEquals(GRADE_TYPE_VALUE, $gitem->gradetype);
    }

    /**
     * Test create_discussion.
     */
    public function test_create_discussion(): void {
        global $DB;

        $this->resetAfterTest(true);

        // User that will create the forum.
        $user = self::getDataGenerator()->create_user();

        // Create course to add the forum to.
        $course = self::getDataGenerator()->create_course();

        // The forum.
        $record = new \stdClass();
        $record->course = $course->id;
        $forum = self::getDataGenerator()->create_module('forum', $record);

        // Add a few discussions.
        $record = [];
        $record['course'] = $course->id;
        $record['forum'] = $forum->id;
        $record['userid'] = $user->id;
        $record['pinned'] = FORUM_DISCUSSION_PINNED; // Pin one discussion.
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
        $record['pinned'] = FORUM_DISCUSSION_UNPINNED; // No pin for others.
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);

        // Check the discussions were correctly created.
        $this->assertEquals(3, $DB->count_records_select(
            'forum_discussions',
            'forum = :forum',
            ['forum' => $forum->id]
        ));

        $record['tags'] = ['Cats', 'mice'];
        $record = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
        $this->assertEquals(
            ['Cats', 'mice'],
            array_values(\core_tag_tag::get_item_tags_array('mod_forum', 'forum_posts', $record->firstpost))
        );
    }

    /**
     * Test create_post.
     */
    public function test_create_post(): void {
        global $DB;

        $this->resetAfterTest(true);

        // Create a bunch of users.
        $user1 = self::getDataGenerator()->create_user();
        $user2 = self::getDataGenerator()->create_user();
        $user3 = self::getDataGenerator()->create_user();
        $user4 = self::getDataGenerator()->create_user();

        // Create course to add the forum.
        $course = self::getDataGenerator()->create_course();

        // The forum.
        $record = new \stdClass();
        $record->course = $course->id;
        $forum = self::getDataGenerator()->create_module('forum', $record);

        // Add a discussion.
        $record->forum = $forum->id;
        $record->userid = $user1->id;
        $discussion = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);

        // Add a bunch of replies, changing the userid.
        $record = new \stdClass();
        $record->discussion = $discussion->id;
        $record->userid = $user2->id;
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post($record);
        $record->userid = $user3->id;
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post($record);
        $record->userid = $user4->id;
        self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post($record);

        // Check the posts were correctly created, remember, when creating a discussion a post
        // is generated as well, so we should have 4 posts, not 3.
        $this->assertEquals(4, $DB->count_records_select(
            'forum_posts',
            'discussion = :discussion',
            ['discussion' => $discussion->id]
        ));

        $record->tags = ['Cats', 'mice'];
        $record = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post($record);
        $this->assertEquals(
            ['Cats', 'mice'],
            array_values(\core_tag_tag::get_item_tags_array('mod_forum', 'forum_posts', $record->id))
        );
    }

    public function test_create_content(): void {
        global $DB;

        $this->resetAfterTest(true);

        // Create a bunch of users.
        $user1 = self::getDataGenerator()->create_user();
        $user2 = self::getDataGenerator()->create_user();
        $user3 = self::getDataGenerator()->create_user();
        $user4 = self::getDataGenerator()->create_user();

        $this->setAdminUser();

        // Create course and forum.
        $course = self::getDataGenerator()->create_course();
        $forum = self::getDataGenerator()->create_module('forum', ['course' => $course]);

        $generator = self::getDataGenerator()->get_plugin_generator('mod_forum');
        // This should create discussion.
        $post1 = $generator->create_content($forum);
        // This should create posts in the discussion.
        $post2 = $generator->create_content($forum, ['parent' => $post1->id]);
        $post3 = $generator->create_content($forum, ['discussion' => $post1->discussion]);
        // This should create posts answering another post.
        $post4 = $generator->create_content($forum, ['parent' => $post2->id]);
        // This should create post with tags.
        $post5 = $generator->create_content($forum, ['parent' => $post2->id, 'tags' => ['Cats', 'mice']]);

        $discussionrecords = $DB->get_records('forum_discussions', ['forum' => $forum->id]);
        $postrecords = $DB->get_records('forum_posts');
        $postrecords2 = $DB->get_records('forum_posts', ['discussion' => $post1->discussion]);
        $this->assertEquals(1, count($discussionrecords));
        $this->assertEquals(5, count($postrecords));
        $this->assertEquals(5, count($postrecords2));
        $this->assertEquals($post1->id, $discussionrecords[$post1->discussion]->firstpost);
        $this->assertEquals($post1->id, $postrecords[$post2->id]->parent);
        $this->assertEquals($post1->id, $postrecords[$post3->id]->parent);
        $this->assertEquals($post2->id, $postrecords[$post4->id]->parent);

        $this->assertEquals(
            ['Cats', 'mice'],
            array_values(\core_tag_tag::get_item_tags_array('mod_forum', 'forum_posts', $post5->id))
        );
    }

    public function test_create_post_time_system(): void {
        $this->resetAfterTest(true);

        $user = self::getDataGenerator()->create_user();
        $course = $this->getDataGenerator()->create_course();
        $forum = self::getDataGenerator()->create_module('forum', (object) [
            'course' => $course->id,
        ]);

        $starttime = time();

        // Add a discussion.
        $discussion = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion((object) [
            'course' => $course->id,
            'forum' => $forum->id,
            'userid' => $user->id,
        ]);

        // Add a post.
        $post = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post((object) [
            'discussion' => $discussion->id,
            'userid' => $user->id,
        ]);

        $this->assertGreaterThanOrEqual($starttime, $discussion->timemodified);
        $this->assertGreaterThanOrEqual($starttime, $post->created);

        // The fallback behavior is to add the number of created posts to the current time to avoid duplicates.
        $this->assertLessThanOrEqual(time() + 1, $discussion->timemodified);
        $this->assertLessThanOrEqual(time() + 2, $post->created);
    }

    public function test_create_post_time_frozen(): void {
        $this->resetAfterTest(true);

        $clock = $this->mock_clock_with_frozen(100);

        $user = self::getDataGenerator()->create_user();
        $course = $this->getDataGenerator()->create_course();
        $forum = self::getDataGenerator()->create_module('forum', (object) [
            'course' => $course->id,
        ]);

        $starttime = time();

        // Add a discussion.
        $discussion = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion((object) [
            'course' => $course->id,
            'forum' => $forum->id,
            'userid' => $user->id,
        ]);
        $this->assertEquals(100, $discussion->timemodified);

        // Add a post.
        $clock->set_to(200);
        $post = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_post((object) [
            'discussion' => $discussion->id,
            'userid' => $user->id,
        ]);

        $this->assertEquals(200, $post->created);
    }
}