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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/>.

/**
 * External mod_book functions unit tests
 *
 * @package    mod_book
 * @category   external
 * @copyright  2015 Juan Leyva <juan@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since      Moodle 3.0
 */

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

global $CFG;

require_once($CFG->dirroot . '/webservice/tests/helpers.php');

/**
     * Test view_book
     */
    public function test_view_book() {
        global $DB;

$this->resetAfterTest(true);

$this->setAdminUser();
        // Setup test data.
        $course = $this->getDataGenerator()->create_course();
        $book = $this->getDataGenerator()->create_module('book', array('course' => $course->id));
        $bookgenerator = $this->getDataGenerator()->get_plugin_generator('mod_book');
        $chapter = $bookgenerator->create_chapter(array('bookid' => $book->id));
        $chapterhidden = $bookgenerator->create_chapter(array('bookid' => $book->id, 'hidden' => 1));

$context = context_module::instance($book->cmid);
        $cm = get_coursemodule_from_instance('book', $book->id);

// Test invalid instance id.
        try {
            mod_book_external::view_book(0);
            $this->fail('Exception expected due to invalid mod_book instance id.');
        } catch (moodle_exception $e) {
            $this->assertEquals('invalidrecord', $e->errorcode);
        }

// Test not-enrolled user.
        $user = self::getDataGenerator()->create_user();
        $this->setUser($user);
        try {
            mod_book_external::view_book($book->id, 0);
            $this->fail('Exception expected due to not enrolled user.');
        } catch (moodle_exception $e) {
            $this->assertEquals('requireloginerror', $e->errorcode);
        }

// Test user with full capabilities.
        $studentrole = $DB->get_record('role', array('shortname' => 'student'));
        $this->getDataGenerator()->enrol_user($user->id, $course->id, $studentrole->id);

// Trigger and capture the event.
        $sink = $this->redirectEvents();

$result = mod_book_external::view_book($book->id, 0);
        $result = external_api::clean_returnvalue(mod_book_external::view_book_returns(), $result);

$events = $sink->get_events();
        $this->assertCount(2, $events);
        $event = array_shift($events);

// Checking that the event contains the expected values.
        $this->assertInstanceOf('\mod_book\event\course_module_viewed', $event);
        $this->assertEquals($context, $event->get_context());
        $moodleurl = new \moodle_url('/mod/book/view.php', array('id' => $cm->id));
        $this->assertEquals($moodleurl, $event->get_url());
        $this->assertEventContextNotUsed($event);
        $this->assertNotEmpty($event->get_name());

$event = array_shift($events);
        $this->assertInstanceOf('\mod_book\event\chapter_viewed', $event);
        $this->assertEquals($chapter->id, $event->objectid);

$result = mod_book_external::view_book($book->id, $chapter->id);
        $result = external_api::clean_returnvalue(mod_book_external::view_book_returns(), $result);

$events = $sink->get_events();
        // We expect a total of 3 events.
        $this->assertCount(3, $events);

// Try to view a hidden chapter.
        try {
            mod_book_external::view_book($book->id, $chapterhidden->id);
            $this->fail('Exception expected due to missing capability.');
        } catch (moodle_exception $e) {
            $this->assertEquals('errorchapter', $e->errorcode);
        }

// Test user with no capabilities.
        // We need a explicit prohibit since this capability is only defined in authenticated user and guest roles.
        assign_capability('mod/book:read', CAP_PROHIBIT, $studentrole->id, $context->id);
        accesslib_clear_all_caches_for_unit_testing();

try {
            mod_book_external::view_book($book->id, 0);
            $this->fail('Exception expected due to missing capability.');
        } catch (moodle_exception $e) {
            $this->assertEquals('nopermissions', $e->errorcode);
        }

}

/**
     * Test get_books_by_courses
     */
    public function test_get_books_by_courses() {
        global $DB, $USER;
        $this->resetAfterTest(true);
        $this->setAdminUser();
        $course1 = self::getDataGenerator()->create_course();
        $bookoptions1 = array(
                              'course' => $course1->id,
                              'name' => 'First Book'
                             );
        $book1 = self::getDataGenerator()->create_module('book', $bookoptions1);
        $course2 = self::getDataGenerator()->create_course();
        $bookoptions2 = array(
                              'course' => $course2->id,
                              'name' => 'Second Book'
                             );
        $book2 = self::getDataGenerator()->create_module('book', $bookoptions2);
        $student1 = $this->getDataGenerator()->create_user();
        $studentrole = $DB->get_record('role', array('shortname' => 'student'));

// Enroll Student1 in Course1.
        self::getDataGenerator()->enrol_user($student1->id,  $course1->id, $studentrole->id);
        $this->setUser($student1);

$books = mod_book_external::get_books_by_courses();
        // We need to execute the return values cleaning process to simulate the web service server.
        $books = external_api::clean_returnvalue(mod_book_external::get_books_by_courses_returns(), $books);
        $this->assertCount(1, $books['books']);
        $this->assertEquals('First Book', $books['books'][0]['name']);
        // We see 10 fields.
        $this->assertCount(10, $books['books'][0]);

// As Student you cannot see some book properties like 'section'.
        $this->assertFalse(isset($books['books'][0]['section']));

// Student1 is not enrolled in course2. The webservice will return a warning!
        $books = mod_book_external::get_books_by_courses(array($course2->id));
        // We need to execute the return values cleaning process to simulate the web service server.
        $books = external_api::clean_returnvalue(mod_book_external::get_books_by_courses_returns(), $books);
        $this->assertCount(0, $books['books']);
        $this->assertEquals(1, $books['warnings'][0]['warningcode']);

// Now as admin.
        $this->setAdminUser();
        // As Admin we can see this book.
        $books = mod_book_external::get_books_by_courses(array($course2->id));
        // We need to execute the return values cleaning process to simulate the web service server.
        $books = external_api::clean_returnvalue(mod_book_external::get_books_by_courses_returns(), $books);

$this->assertCount(1, $books['books']);
        $this->assertEquals('Second Book', $books['books'][0]['name']);
        // We see 17 fields.
        $this->assertCount(17, $books['books'][0]);
        // As an Admin you can see some book properties like 'section'.
        $this->assertEquals(0, $books['books'][0]['section']);

// Enrol student in the second course.
        self::getDataGenerator()->enrol_user($student1->id,  $course2->id, $studentrole->id);
        $this->setUser($student1);
        $books = mod_book_external::get_books_by_courses();
        $books = external_api::clean_returnvalue(mod_book_external::get_books_by_courses_returns(), $books);
        $this->assertCount(2, $books['books']);

}
}