<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Auth;

use Brain\Monkey\Functions;
use Mockery;
use Unsupervised\Schedular\Auth\RegistrationLoginGate;
use Unsupervised\Schedular\Auth\RegistrationStatus;
use Unsupervised\Schedular\Auth\RoleManager;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class RegistrationLoginGateTest extends TestCase
{
    /**
     * Stub get_user_meta to describe a single account's pending state.
     */
    private function stubMeta(string $awaiting, string $confirmed): void
    {
        Functions\when('get_user_meta')->alias(static function (int $id, string $key) use ($awaiting, $confirmed) {
            if ($key === RegistrationStatus::META_AWAITING_APPROVAL) {
                return $awaiting;
            }
            if ($key === RegistrationStatus::META_EMAIL_CONFIRMED) {
                return $confirmed;
            }
            return '';
        });
    }

    private function user(int $id): \WP_User
    {
        $user     = Mockery::mock(\WP_User::class);
        $user->ID = $id;

        return $user;
    }

    public function testBlocksLoginWhileEmailUnconfirmed(): void
    {
        $this->stubMeta('1', '');

        $result = (new RegistrationLoginGate())->blockUnconfirmed($this->user(7));

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('us_email_unconfirmed', $result->get_error_code());
    }

    public function testAllowsLoginWhenConfirmedButAwaitingApproval(): void
    {
        $this->stubMeta('1', '1');

        $user = $this->user(7);

        self::assertSame($user, (new RegistrationLoginGate())->blockUnconfirmed($user));
    }

    public function testAllowsLoginForApprovedStudent(): void
    {
        $this->stubMeta('', '1');

        $user = $this->user(7);

        self::assertSame($user, (new RegistrationLoginGate())->blockUnconfirmed($user));
    }

    public function testIgnoresUsersWithNoPendingMeta(): void
    {
        // Invite/admin-created students carry no meta at all.
        $this->stubMeta('', '');

        $user = $this->user(7);

        self::assertSame($user, (new RegistrationLoginGate())->blockUnconfirmed($user));
    }

    public function testPassesThroughAnEarlierError(): void
    {
        $error = new \WP_Error('some_earlier_error', 'nope');

        self::assertSame($error, (new RegistrationLoginGate())->blockUnconfirmed($error));
    }

    public function testWithholdsBookingCapWhileAwaitingApproval(): void
    {
        $this->stubMeta('1', '1');

        $allcaps = [ RoleManager::CAP_BOOK_LESSON => true, 'read' => true ];

        $result = (new RegistrationLoginGate())
            ->withholdBookingWhilePending($allcaps, [], [], $this->user(7));

        self::assertArrayNotHasKey(RoleManager::CAP_BOOK_LESSON, $result);
        self::assertTrue($result['read']);
    }

    public function testKeepsBookingCapForApprovedStudent(): void
    {
        $this->stubMeta('', '1');

        $allcaps = [ RoleManager::CAP_BOOK_LESSON => true ];

        $result = (new RegistrationLoginGate())
            ->withholdBookingWhilePending($allcaps, [], [], $this->user(7));

        self::assertTrue($result[RoleManager::CAP_BOOK_LESSON]);
    }

    public function testLeavesCapsUntouchedForNonUserArg(): void
    {
        $allcaps = [ RoleManager::CAP_BOOK_LESSON => true ];

        $result = (new RegistrationLoginGate())
            ->withholdBookingWhilePending($allcaps, [], [], null);

        self::assertSame($allcaps, $result);
    }

    /**
     * Describe a user to the `user_register` guard: which role they hold, and
     * whether whoever created them is studio staff.
     */
    private function stubSignup(string $role, bool $byStaff): void
    {
        $user        = Mockery::mock(\WP_User::class);
        $user->roles = [$role];

        Functions\when('get_userdata')->justReturn($user);
        Functions\when('current_user_can')->justReturn($byStaff);
    }

    public function testStudentCreatedByAnUnknownSignupFormIsHeldForApproval(): void
    {
        // Open registration switches the site's own users_can_register on and
        // makes Student the default role, so any other signup form on the site
        // now mints students. They must not arrive able to book.
        $this->stubSignup(RoleManager::STUDENT, byStaff: false);

        Functions\expect('update_user_meta')->once()
            ->with(7, RegistrationStatus::META_AWAITING_APPROVAL, '1');
        // Counted as confirmed: nobody asked them to confirm, and there is no
        // token for them to answer with, so blocking the login would strand them.
        Functions\expect('update_user_meta')->once()
            ->with(7, RegistrationStatus::META_EMAIL_CONFIRMED, '1');

        (new RegistrationLoginGate())->holdUnknownSignup(7);
    }

    public function testStudentCreatedByStaffIsLeftActive(): void
    {
        // An administrator adding a student from wp-admin could have approved
        // them in the next click; making them do so is ceremony.
        $this->stubSignup(RoleManager::STUDENT, byStaff: true);

        Functions\expect('update_user_meta')->never();

        (new RegistrationLoginGate())->holdUnknownSignup(7);
    }

    public function testNonStudentSignupIsNotHeld(): void
    {
        $this->stubSignup(RoleManager::INSTRUCTOR, byStaff: false);

        Functions\expect('update_user_meta')->never();

        (new RegistrationLoginGate())->holdUnknownSignup(7);
    }

    public function testUnknownUserIdIsIgnored(): void
    {
        Functions\when('get_userdata')->justReturn(false);
        Functions\expect('update_user_meta')->never();

        (new RegistrationLoginGate())->holdUnknownSignup(0);
    }
}