<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit;

use Brain\Monkey\Functions;
use Mockery;
use Unsupervised\Schedular\Auth\RoleManager;
use Unsupervised\Schedular\Payment\ScheduledBillingRunner;
use Unsupervised\Schedular\Payment\StudioSettings;
use Unsupervised\Schedular\Schema;
use Unsupervised\Schedular\Uninstaller;

class UninstallerTest extends TestCase
{
    /** @var array<string, mixed> Option store the stubs read and write. */
    private array $options = [];

    /** @var list<string> Options deleted during the run. */
    private array $deleted = [];

    /** @var list<string> SQL statements sent to the database. */
    private array $queries = [];

    /** @var list<string> User meta keys deleted for every user. */
    private array $metaDeleted = [];

    /** @var list<string> Roles removed. */
    private array $rolesRemoved = [];

    /** @var list<string> Cron hooks cleared. */
    private array $hooksCleared = [];

    protected function setUp(): void
    {
        parent::setUp();

        $options      = &$this->options;
        $deleted      = &$this->deleted;
        $metaDeleted  = &$this->metaDeleted;
        $rolesRemoved = &$this->rolesRemoved;
        $hooksCleared = &$this->hooksCleared;

        Functions\when('get_option')->alias(
            static fn(string $key, mixed $default = false): mixed => $options[$key] ?? $default
        );
        Functions\when('update_option')->alias(
            static function (string $key, mixed $value) use (&$options): bool {
                $options[$key] = $value;

                return true;
            }
        );
        Functions\when('delete_option')->alias(
            static function (string $key) use (&$options, &$deleted): bool {
                unset($options[$key]);
                $deleted[] = $key;

                return true;
            }
        );
        Functions\when('delete_transient')->justReturn(true);
        Functions\when('wp_clear_scheduled_hook')->alias(
            static function (string $hook) use (&$hooksCleared): int {
                $hooksCleared[] = $hook;

                return 0;
            }
        );
        Functions\when('delete_metadata')->alias(
            static function (string $type, int $id, string $key) use (&$metaDeleted): bool {
                $metaDeleted[] = $key;

                return true;
            }
        );
        Functions\when('remove_role')->alias(
            static function (string $role) use (&$rolesRemoved): void {
                $rolesRemoved[] = $role;
            }
        );

        $db         = Mockery::mock(\wpdb::class);
        $db->prefix = 'wp_';
        $queries    = &$this->queries;
        $db->shouldReceive('prepare')->andReturnUsing(
            static fn(string $sql, mixed ...$args): string => str_replace('%i', (string) $args[0], $sql)
        );
        $db->shouldReceive('query')->andReturnUsing(
            static function (string $sql) use (&$queries): int {
                $queries[] = $sql;

                return 1;
            }
        );

        $GLOBALS['wpdb'] = $db;
    }

    protected function tearDown(): void
    {
        unset($GLOBALS['wpdb']);
        parent::tearDown();
    }

    /**
     * A Stripe secret is a credential, not a record. It can be pasted back in
     * from the Stripe dashboard in a minute, and a site that no longer has the
     * code to use it has no business still holding it — so it goes whether or
     * not the studio asked to keep its data.
     */
    public function testStripeCredentialsAreForgottenEvenWhenTheDataIsKept(): void
    {
        $this->options = [
            StudioSettings::OPT_SECRET         => 'sk_live_secret',
            StudioSettings::OPT_WEBHOOK_SECRET => 'whsec_secret',
            StudioSettings::OPT_PUBLISHABLE    => 'pk_live_key',
            StudioSettings::OPT_MODE           => 'live',
            StudioSettings::OPT_HST_RATE       => '13',
        ];

        (new Uninstaller())->run();

        self::assertArrayNotHasKey(StudioSettings::OPT_SECRET, $this->options);
        self::assertArrayNotHasKey(StudioSettings::OPT_WEBHOOK_SECRET, $this->options);
        self::assertArrayNotHasKey(StudioSettings::OPT_PUBLISHABLE, $this->options);
        self::assertArrayNotHasKey(StudioSettings::OPT_MODE, $this->options);

        // The studio's own settings are records, and stay.
        self::assertSame('13', $this->options[StudioSettings::OPT_HST_RATE]);
    }

    public function testKeepingDataDropsNoTablesAndRemovesNoRoles(): void
    {
        $this->options = [Uninstaller::OPT_DELETE_DATA => '0'];

        (new Uninstaller())->run();

        self::assertSame([], $this->queries);
        self::assertSame([], $this->metaDeleted);
        // A site keeping its data keeps the roles its students hold, or every one
        // of them is left with no capabilities until the plugin is reinstalled.
        self::assertSame([], $this->rolesRemoved);
    }

    public function testFullPurgeDropsEveryTableTheSchemaDeclares(): void
    {
        $this->options = [Uninstaller::OPT_DELETE_DATA => '1'];

        (new Uninstaller())->run();

        self::assertCount(count(Schema::TABLES), $this->queries);
        foreach (Schema::TABLES as $table) {
            self::assertContains('DROP TABLE IF EXISTS wp_' . $table, $this->queries);
        }
    }

    public function testFullPurgeClearsSettingsUserMetaAndRoles(): void
    {
        $this->options = [
            Uninstaller::OPT_DELETE_DATA   => '1',
            'us_schedular_version'         => '1.5.6',
            StudioSettings::OPT_HST_RATE   => '13',
            StudioSettings::OPT_CURRENCY   => 'CAD',
        ];

        (new Uninstaller())->run();

        self::assertContains('us_schedular_version', $this->deleted);
        self::assertContains(StudioSettings::OPT_HST_RATE, $this->deleted);
        self::assertContains(Uninstaller::OPT_DELETE_DATA, $this->deleted);

        // Nothing student-shaped is left hanging off a user account.
        self::assertContains('us_payment_method', $this->metaDeleted);
        self::assertContains('us_child', $this->metaDeleted);
        self::assertContains('us_awaiting_approval', $this->metaDeleted);

        self::assertSame(
            [RoleManager::STUDIO_ADMIN, RoleManager::INSTRUCTOR, RoleManager::STUDENT],
            $this->rolesRemoved
        );
    }

    /**
     * Open registration switches the site's own `users_can_register` on and makes
     * Student the default role. Leaving those behind would leave the site taking
     * public signups into a role that is, one line later, about to stop existing.
     */
    public function testCoreRegistrationSettingsAreRestoredFromTheSnapshot(): void
    {
        $this->options = [
            'users_can_register'                        => '1',
            'default_role'                              => RoleManager::STUDENT,
            StudioSettings::OPT_PREV_USERS_CAN_REGISTER => '0',
            StudioSettings::OPT_PREV_DEFAULT_ROLE       => 'subscriber',
        ];

        (new Uninstaller())->run();

        self::assertSame('0', $this->options['users_can_register']);
        self::assertSame('subscriber', $this->options['default_role']);
        // The snapshot is spent.
        self::assertArrayNotHasKey(StudioSettings::OPT_PREV_USERS_CAN_REGISTER, $this->options);
        self::assertArrayNotHasKey(StudioSettings::OPT_PREV_DEFAULT_ROLE, $this->options);
    }

    public function testSiteThatNeverOpenedRegistrationKeepsItsOwnSettings(): void
    {
        $this->options = ['users_can_register' => '1', 'default_role' => 'contributor'];

        (new Uninstaller())->run();

        // No snapshot means the plugin never touched these, so nor does this.
        self::assertSame('1', $this->options['users_can_register']);
        self::assertSame('contributor', $this->options['default_role']);
    }

    public function testTheScheduledBillingEventIsAlwaysCleared(): void
    {
        // Deactivation clears it too, and always precedes a delete — but a site
        // whose plugin files simply vanished never ran that hook, and a schedule
        // pointing at code that is gone is left firing into nothing.
        (new Uninstaller())->run();

        self::assertSame([ScheduledBillingRunner::HOOK], $this->hooksCleared);
    }

    public function testSettingIsOffUntilItIsExplicitlyTurnedOn(): void
    {
        self::assertFalse(Uninstaller::deletesDataOnUninstall());

        Uninstaller::setDeletesDataOnUninstall(true);
        self::assertTrue(Uninstaller::deletesDataOnUninstall());

        Uninstaller::setDeletesDataOnUninstall(false);
        self::assertFalse(Uninstaller::deletesDataOnUninstall());
    }
}