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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/>.

/**
 * Contains unit tests for core_completion/activity_custom_completion.
 *
 * @package   mod_glossary
 * @copyright Simey Lameze <simey@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

declare(strict_types=1);

namespace mod_glossary;

use advanced_testcase;
use cm_info;
use coding_exception;
use mod_glossary\completion\custom_completion;
use moodle_exception;

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

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

/**
 * Class for unit testing mod_glossary/activity_custom_completion.
 *
 * @package   mod_glossary
 * @copyright Simey Lameze <simey@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class custom_completion_test extends advanced_testcase {

/**
     * Data provider for get_state().
     *
     * @return array[]
     */
    public function get_state_provider(): array {
        return [
            'Undefined rule' => [
                'somenonexistentrule', COMPLETION_DISABLED, 0, null, coding_exception::class
            ],
            'Rule not available' => [
                'completionentries', COMPLETION_DISABLED, 0, null, moodle_exception::class
            ],
            'Rule available, user has not submitted' => [
                'completionentries', COMPLETION_ENABLED, 0, COMPLETION_INCOMPLETE, null
            ],
            'Rule available, user has submitted' => [
                'completionentries', COMPLETION_ENABLED, 2, COMPLETION_COMPLETE, null
            ],
        ];
    }

/**
     * Test for get_state().
     *
     * @dataProvider get_state_provider
     * @param string $rule The custom completion rule.
     * @param int $available Whether this rule is available.
     * @param int $entries The number of entries.
     * @param int|null $status Expected status.
     * @param string|null $exception Expected exception.
     */
    public function test_get_state(string $rule, int $available, int $entries, ?int $status, ?string $exception): void {
        global $DB;

if (!is_null($exception)) {
            $this->expectException($exception);
        }

// Custom completion rule data for cm_info::customdata.
        $customdataval = [
            'customcompletionrules' => [
                $rule => $available
            ]
        ];

// Build a mock cm_info instance.
        $mockcminfo = $this->getMockBuilder(cm_info::class)
            ->disableOriginalConstructor()
            ->onlyMethods(['__get'])
            ->getMock();

// Mock the return of the magic getter method when fetching the cm_info object's customdata and instance values.
        $mockcminfo->expects($this->any())
            ->method('__get')
            ->will($this->returnValueMap([
                ['customdata', $customdataval],
                ['instance', 1],
            ]));

// Mock the DB calls.
        $DB = $this->createMock(get_class($DB));
        $DB->expects($this->atMost(1))
            ->method('count_records')
            ->willReturn($entries);

$customcompletion = new custom_completion($mockcminfo, 2);
        $this->assertEquals($status, $customcompletion->get_state($rule));
    }

/**
     * Test for get_defined_custom_rules().
     */
    public function test_get_defined_custom_rules(): void {
        $rules = custom_completion::get_defined_custom_rules();
        $this->assertCount(1, $rules);
        $this->assertEquals('completionentries', $rules[0]);
    }

/**
     * Test for get_defined_custom_rule_descriptions().
     */
    public function test_get_custom_rule_descriptions(): void {
        // Get defined custom rules.
        $rules = custom_completion::get_defined_custom_rules();

// Build a mock cm_info instance.
        $mockcminfo = $this->getMockBuilder(cm_info::class)
            ->disableOriginalConstructor()
            ->onlyMethods(['__get'])
            ->getMock();

// Instantiate a custom_completion object using the mocked cm_info.
        $customcompletion = new custom_completion($mockcminfo, 1);

// Get custom rule descriptions.
        $ruledescriptions = $customcompletion->get_custom_rule_descriptions();

// Confirm that defined rules and rule descriptions are consistent with each other.
        $this->assertEquals(count($rules), count($ruledescriptions));
        foreach ($rules as $rule) {
            $this->assertArrayHasKey($rule, $ruledescriptions);
        }
    }

/**
     * Test for is_defined().
     */
    public function test_is_defined(): void {
        // Build a mock cm_info instance.
        $mockcminfo = $this->getMockBuilder(cm_info::class)
            ->disableOriginalConstructor()
            ->getMock();

$customcompletion = new custom_completion($mockcminfo, 1);

// Rule is defined.
        $this->assertTrue($customcompletion->is_defined('completionentries'));

// Undefined rule.
        $this->assertFalse($customcompletion->is_defined('somerandomrule'));
    }

/**
     * Data provider for test_get_available_custom_rules().
     *
     * @return array[]
     */
    public function get_available_custom_rules_provider(): array {
        return [
            'Completion submit available' => [
                COMPLETION_ENABLED, ['completionentries']
            ],
            'Completion submit not available' => [
                COMPLETION_DISABLED, []
            ],
        ];
    }

/**
     * Test for get_available_custom_rules().
     *
     * @dataProvider get_available_custom_rules_provider
     * @param int $status
     * @param array $expected
     */
    public function test_get_available_custom_rules(int $status, array $expected): void {
        $customdataval = [
            'customcompletionrules' => [
                'completionentries' => $status
            ]
        ];

// Build a mock cm_info instance.
        $mockcminfo = $this->getMockBuilder(cm_info::class)
            ->disableOriginalConstructor()
            ->onlyMethods(['__get'])
            ->getMock();

// Mock the return of magic getter for the customdata attribute.
        $mockcminfo->expects($this->any())
            ->method('__get')
            ->with('customdata')
            ->willReturn($customdataval);

$customcompletion = new custom_completion($mockcminfo, 1);
        $this->assertEquals($expected, $customcompletion->get_available_custom_rules());
    }
}