<?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 tool_policy;

use externallib_advanced_testcase;
use tool_mobile\external as external_mobile;

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

global $CFG;

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

/**
 * External policy webservice API tests.
 *
 * @package tool_policy
 * @copyright 2018 Sara Arjona <sara@moodle.com>
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class externallib_test extends externallib_advanced_testcase {

    /** @var \tool_policy\policy_version $policy1 Policy document 1. */
    protected $policy1;

    /** @var \tool_policy\policy_version $policy2 Policy document 2. */
    protected $policy2;

    /** @var \tool_policy\policy_version $policy3 Policy document 3. */
    protected $policy3;

    /** @var \stdClass $child user record. */
    protected $child;

    /** @var \stdClass $parent user record. */
    protected $parent;

    /** @var \stdClass $adult user record. */
    protected $adult;

    /**
     * Setup function- we will create some policy docs.
     */
    public function setUp(): void {
        $this->resetAfterTest(true);
        $this->setAdminUser();

        // Prepare a policy document with some versions.
        $formdata = api::form_policydoc_data(new \tool_policy\policy_version(0));
        $formdata->name = 'Test policy';
        $formdata->revision = 'v1';
        $formdata->summary_editor = ['text' => 'summary', 'format' => FORMAT_HTML, 'itemid' => 0];
        $formdata->content_editor = ['text' => 'content', 'format' => FORMAT_HTML, 'itemid' => 0];
        $this->policy1 = api::form_policydoc_add($formdata);

        $formdata = api::form_policydoc_data($this->policy1);
        $formdata->revision = 'v2';
        $this->policy2 = api::form_policydoc_update_new($formdata);

        $formdata = api::form_policydoc_data($this->policy1);
        $formdata->revision = 'v3';
        $this->policy3 = api::form_policydoc_update_new($formdata);

        api::make_current($this->policy2->get('id'));

        // Create users.
        $this->child = $this->getDataGenerator()->create_user();
        $this->parent = $this->getDataGenerator()->create_user();
        $this->adult = $this->getDataGenerator()->create_user();

        $syscontext = \context_system::instance();
        $childcontext = \context_user::instance($this->child->id);

        $roleminorid = create_role('Digital minor', 'digiminor', 'Not old enough to accept site policies themselves');
        $roleparentid = create_role('Parent', 'parent', 'Can accept policies on behalf of their child');

        assign_capability('tool/policy:accept', CAP_PROHIBIT, $roleminorid, $syscontext->id);
        assign_capability('tool/policy:acceptbehalf', CAP_ALLOW, $roleparentid, $syscontext->id);

        role_assign($roleminorid, $this->child->id, $syscontext->id);
        role_assign($roleparentid, $this->parent->id, $childcontext->id);
    }

    /**
     * Test for the get_policy_version() function.
     */
    public function test_get_policy_version(): void {
        $this->setUser($this->adult);

        // View current policy version.
        $result = external::get_policy_version($this->policy2->get('id'));
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(1, $result['result']);
        $this->assertEquals($this->policy1->get('name'), $result['result']['policy']['name']);
        $this->assertEquals($this->policy1->get('content'), $result['result']['policy']['content']);

        // View draft policy version.
        $result = external::get_policy_version($this->policy3->get('id'));
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(0, $result['result']);
        $this->assertCount(1, $result['warnings']);
        $this->assertEquals(array_pop($result['warnings'])['warningcode'], 'errorusercantviewpolicyversion');

        // Add test for non existing versionid.
        $result = external::get_policy_version(999);
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(0, $result['result']);
        $this->assertCount(1, $result['warnings']);
        $this->assertEquals(array_pop($result['warnings'])['warningcode'], 'errorpolicyversionnotfound');

        // View previous non-accepted version in behalf of a child.
        $this->setUser($this->parent);
        $result = external::get_policy_version($this->policy1->get('id'), $this->child->id);
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(0, $result['result']);
        $this->assertCount(1, $result['warnings']);
        $this->assertEquals(array_pop($result['warnings'])['warningcode'], 'errorusercantviewpolicyversion');

        // Let the parent accept the policy on behalf of her child and view it again.
        api::accept_policies($this->policy1->get('id'), $this->child->id);
        $result = external::get_policy_version($this->policy1->get('id'), $this->child->id);
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(1, $result['result']);
        $this->assertEquals($this->policy1->get('name'), $result['result']['policy']['name']);
        $this->assertEquals($this->policy1->get('content'), $result['result']['policy']['content']);

        // Only parent is able to view the child policy version accepted by her child.
        $this->setUser($this->adult);
        $result = external::get_policy_version($this->policy1->get('id'), $this->child->id);
        $result = \core_external\external_api::clean_returnvalue(external::get_policy_version_returns(), $result);
        $this->assertCount(0, $result['result']);
        $this->assertCount(1, $result['warnings']);
        $this->assertEquals(array_pop($result['warnings'])['warningcode'], 'errorusercantviewpolicyversion');
    }

    /**
     * Test tool_mobile\external callback to site_policy_handler.
     */
    public function test_get_config_with_site_policy_handler(): void {
        global $CFG;

        $this->resetAfterTest(true);

        // Set the handler for the site policy, make sure it substitutes link to the sitepolicy.
        $CFG->sitepolicyhandler = 'tool_policy';
        $sitepolicymanager = new \core_privacy\local\sitepolicy\manager();
        $result = external_mobile::get_config();
        $result = \core_external\external_api::clean_returnvalue(external_mobile::get_config_returns(), $result);
        $toolsitepolicy = $sitepolicymanager->get_embed_url();
        foreach (array_values($result['settings']) as $r) {
            if ($r['name'] == 'sitepolicy') {
                $configsitepolicy = $r['value'];
            }
        }
        $this->assertEquals($toolsitepolicy, $configsitepolicy);
    }

    /**
     * Test for core_privacy\sitepolicy\manager::accept() when site policy handler is set.
     */
    public function test_agree_site_policy_with_handler(): void {
        global $CFG, $DB, $USER;

        $this->resetAfterTest(true);
        $user = self::getDataGenerator()->create_user();
        $this->setUser($user);

        // Set mock site policy handler. See function tool_phpunit_site_policy_handler() below.
        $CFG->sitepolicyhandler = 'tool_policy';
        $this->assertEquals(0, $USER->policyagreed);
        $sitepolicymanager = new \core_privacy\local\sitepolicy\manager();

        // Make sure user can not login.
        $toolconsentpage = $sitepolicymanager->get_redirect_url();
        $this->expectException(\moodle_exception::class);
        $this->expectExceptionMessage(get_string('sitepolicynotagreed', 'error', $toolconsentpage->out()));
        \core_user_external::validate_context(\context_system::instance());

        // Call WS to agree to the site policy. It will call tool_policy handler.
        $result = \core_user_external::agree_site_policy();
        $result = \core_external\external_api::clean_returnvalue(\core_user_external::agree_site_policy_returns(), $result);
        $this->assertTrue($result['status']);
        $this->assertCount(0, $result['warnings']);
        $this->assertEquals(1, $USER->policyagreed);
        $this->assertEquals(1, $DB->get_field('user', 'policyagreed', array('id' => $USER->id)));

        // Try again, we should get a warning.
        $result = \core_user_external::agree_site_policy();
        $result = \core_external\external_api::clean_returnvalue(\core_user_external::agree_site_policy_returns(), $result);
        $this->assertFalse($result['status']);
        $this->assertCount(1, $result['warnings']);
        $this->assertEquals('alreadyagreed', $result['warnings'][0]['warningcode']);
    }

    /**
     * Test for core_privacy\sitepolicy\manager::accept() when site policy handler is set.
     */
    public function test_checkcanaccept_with_handler(): void {
        global $CFG;

        $this->resetAfterTest(true);
        $CFG->sitepolicyhandler = 'tool_policy';
        $syscontext = \context_system::instance();
        $sitepolicymanager = new \core_privacy\local\sitepolicy\manager();

        $adult = $this->getDataGenerator()->create_user();

        $child = $this->getDataGenerator()->create_user();
        $rolechildid = create_role('Child', 'child', 'Not old enough to accept site policies themselves');
        assign_capability('tool/policy:accept', CAP_PROHIBIT, $rolechildid, $syscontext->id);
        role_assign($rolechildid, $child->id, $syscontext->id);

        // Default user can accept policies.
        $this->setUser($adult);
        $result = external_mobile::get_config();
        $result = \core_external\external_api::clean_returnvalue(external_mobile::get_config_returns(), $result);
        $toolsitepolicy = $sitepolicymanager->accept();
        $this->assertTrue($toolsitepolicy);

        // Child user can not accept policies.
        $this->setUser($child);
        $result = external_mobile::get_config();
        $result = \core_external\external_api::clean_returnvalue(external_mobile::get_config_returns(), $result);
        $this->expectException(\required_capability_exception::class);
        $sitepolicymanager->accept();
    }

    /**
     * Test for external function get_user_acceptances().
     */
    public function test_external_get_user_acceptances(): void {
        global $CFG;

        $this->resetAfterTest(true);
        $CFG->sitepolicyhandler = 'tool_policy';
        $user = $this->getDataGenerator()->create_user();
        $this->setUser($user);

        // Create optional policy.
        $formdata = api::form_policydoc_data(new \tool_policy\policy_version(0));
        $formdata->name = 'Test optional policy';
        $formdata->revision = 'v1';
        $formdata->optional = 1;
        $formdata->summary_editor = ['text' => 'summary', 'format' => FORMAT_HTML, 'itemid' => 0];
        $formdata->content_editor = ['text' => 'content', 'format' => FORMAT_HTML, 'itemid' => 0];
        $optionalpolicy = api::form_policydoc_add($formdata);
        api::make_current($optionalpolicy->get('id'));
        // Accept this version.
        api::accept_policies([$optionalpolicy->get('id')], $user->id, null);
        // Generate new version.
        $formdata = api::form_policydoc_data($optionalpolicy);
        $formdata->revision = 'v2';
        $optionalpolicynew = api::form_policydoc_update_new($formdata);
        api::make_current($optionalpolicynew->get('id'));

        // Now return all policies the user should be able to see, including previous versions of existing policies, if accepted/declined.
        $policies = \tool_policy\external\get_user_acceptances::execute();
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\get_user_acceptances::execute_returns(), $policies);

        $this->assertCount(3, $policies['policies']);
        $this->assertCount(0, $policies['warnings']);
        foreach ($policies['policies'] as $policy) {
            if ($policy['versionid'] == $this->policy2->get('id')) {
                $this->assertEquals($this->policy2->get('name'), $policy['name']);
                $this->assertEquals(0, $policy['optional']);
                $this->assertTrue($policy['canaccept']);
                $this->assertFalse($policy['candecline']);  // Cannot decline or revoke mandatory for myself.
                $this->assertFalse($policy['canrevoke']);
            } else {
                $this->assertEquals($optionalpolicy->get('name'), $policy['name']);
                $this->assertEquals(1, $policy['optional']);
                $this->assertTrue($policy['canaccept']);
                $this->assertTrue($policy['candecline']);   // Can decline or revoke optional for myself.
                $this->assertTrue($policy['canrevoke']);
            }
            $this->assertNotContains('acceptance', $policy);    // Nothing accepted yet.
        }

        // Get other user acceptances.
        $this->parent->policyagreed = 1;
        $this->setUser($this->parent);
        $policies = \tool_policy\external\get_user_acceptances::execute($this->child->id);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\get_user_acceptances::execute_returns(), $policies);
        $this->assertCount(2, $policies['policies']);
        foreach ($policies['policies'] as $policy) {
            if ($policy['versionid'] == $this->policy2->get('id')) {
                $this->assertTrue($policy['canaccept']);
                $this->assertFalse($policy['candecline']);  // Cannot decline mandatory in general.
                $this->assertTrue($policy['canrevoke']);
            } else {
                $this->assertTrue($policy['canaccept']);
                $this->assertTrue($policy['candecline']);
                $this->assertTrue($policy['canrevoke']);
            }
            $this->assertNotContains('acceptance', $policy);    // Nothing accepted yet.
        }

        // Get other user acceptances without permission.
        $this->expectException(\required_capability_exception::class);
        $policies = \tool_policy\external\get_user_acceptances::execute($user->id);
    }

    /**
     * Test for external function set_acceptances_status().
     */
    public function test_external_set_acceptances_status(): void {
        global $CFG;

        $this->resetAfterTest(true);
        $CFG->sitepolicyhandler = 'tool_policy';
        $user = $this->getDataGenerator()->create_user();
        $this->setUser($user);

        // Create optional policy.
        $formdata = api::form_policydoc_data(new \tool_policy\policy_version(0));
        $formdata->name = 'Test optional policy';
        $formdata->revision = 'v1';
        $formdata->optional = 1;
        $formdata->summary_editor = ['text' => 'summary', 'format' => FORMAT_HTML, 'itemid' => 0];
        $formdata->content_editor = ['text' => 'content', 'format' => FORMAT_HTML, 'itemid' => 0];
        $optionalpolicy = api::form_policydoc_add($formdata);
        api::make_current($optionalpolicy->get('id'));
        // Decline this version.
        api::decline_policies([$optionalpolicy->get('id')], $user->id, null);
        // Generate new version and make it current.
        $formdata = api::form_policydoc_data($optionalpolicy);
        $formdata->revision = 'v2';
        $optionalpolicynew = api::form_policydoc_update_new($formdata);
        api::make_current($optionalpolicynew->get('id'));

        // Accept all the current policies.
        $ids = [
            ['versionid' => $this->policy2->get('id'), 'status' => 1],
            ['versionid' => $optionalpolicynew->get('id'), 'status' => 1],
        ];

        $policies = \tool_policy\external\set_acceptances_status::execute($ids);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\set_acceptances_status::execute_returns(), $policies);

        $this->assertEquals(1, $policies['policyagreed']);
        $this->assertCount(0, $policies['warnings']);

        // And now accept and old one.
        $ids = [['versionid' => $optionalpolicy->get('id'), 'status' => 1, 'note' => 'I accept for me.']];  // The note will be ignored.
        $policies = \tool_policy\external\set_acceptances_status::execute($ids);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\set_acceptances_status::execute_returns(), $policies);

        // Retrieve and check all are accepted now.
        $policies = \tool_policy\external\get_user_acceptances::execute();
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\get_user_acceptances::execute_returns(), $policies);

        $this->assertCount(3, $policies['policies']);
        foreach ($policies['policies'] as $policy) {
            $this->assertEquals(1, $policy['acceptance']['status']);    // Check all accepted.
            $this->assertEmpty($policy['acceptance']['note']);  // The note was not recorded because it was for itself.
        }

        // Decline optional only.
        $policies = \tool_policy\external\set_acceptances_status::execute([['versionid' => $optionalpolicynew->get('id'), 'status' => 0]]);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\set_acceptances_status::execute_returns(), $policies);

        $this->assertEquals(1, $policies['policyagreed']);
        $this->assertCount(0, $policies['warnings']);

        $policies = \tool_policy\external\get_user_acceptances::execute();
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\get_user_acceptances::execute_returns(), $policies);

        $this->assertCount(3, $policies['policies']);
        foreach ($policies['policies'] as $policy) {
            if ($policy['versionid'] == $optionalpolicynew->get('id')) {
                $this->assertEquals(0, $policy['acceptance']['status']);    // Not accepted.
            } else {
                $this->assertEquals(1, $policy['acceptance']['status']);    // Accepted.
            }
        }

        // Parent & child case now. Accept the optional ONLY on behalf of someone else.
        $this->parent->policyagreed = 1;
        $this->setUser($this->parent);
        $notetext = 'I accept this on behalf of my child Santiago.';
        $policies = \tool_policy\external\set_acceptances_status::execute(
            [['versionid' => $optionalpolicynew->get('id'), 'status' => 1, 'note' => $notetext]], $this->child->id);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\set_acceptances_status::execute_returns(), $policies);

        $this->assertEquals(0, $policies['policyagreed']);  // Mandatory missing.
        $this->assertCount(0, $policies['warnings']);

        $policies = \tool_policy\external\get_user_acceptances::execute($this->child->id);
        $policies = \core_external\external_api::clean_returnvalue(
            \tool_policy\external\get_user_acceptances::execute_returns(), $policies);

        $this->assertCount(2, $policies['policies']);
        foreach ($policies['policies'] as $policy) {
            if ($policy['versionid'] == $this->policy2->get('id')) {
                $this->assertNotContains('acceptance', $policy);    // Not yet accepted.
                $this->assertArrayNotHasKey('acceptance', $policy);
            } else {
                $this->assertEquals(1, $policy['acceptance']['status']);    // Accepted.
                $this->assertEquals($notetext, $policy['acceptance']['note']);
            }
        }

        // Try to accept on behalf of other user with no permissions.
        $this->expectException(\required_capability_exception::class);
        $policies = \tool_policy\external\set_acceptances_status::execute([['versionid' => $optionalpolicynew->get('id'), 'status' => 1]], $user->id);
    }

    /**
     * Test for external function set_acceptances_status decline mandatory.
     */
    public function test_external_set_acceptances_status_decline_mandatory(): void {
        global $CFG;

        $this->resetAfterTest(true);
        $CFG->sitepolicyhandler = 'tool_policy';
        $this->parent->policyagreed = 1;
        $this->setUser($this->parent);

        $this->expectException(\moodle_exception::class);
        $this->expectExceptionMessage(get_string('errorpolicyversioncompulsory', 'tool_policy'));
        $ids = [['versionid' => $this->policy2->get('id'), 'status' => 0]];
        $policies = \tool_policy\external\set_acceptances_status::execute($ids, $this->child->id);
    }
}
