<?php

declare(strict_types=1);

namespace KTXT\Mail\Tests\Unit;

use KTXC\Module\ModuleManager;
use KTXF\Event\EventDispatcherInterface;
use KTXF\Mail\Collection\CollectionBaseInterface;
use KTXF\Mail\Entity\EntityBaseInterface;
use KTXF\Mail\Entity\EntityMutableInterface;
use KTXF\Mail\Object\MessagePropertiesMutableInterface;
use KTXF\Mail\Service\ServiceBaseInterface;
use KTXF\Mail\Service\ServiceEntityMutableInterface;
use KTXF\Mail\Service\ServiceEntitySubmitInterface;
use KTXF\Mail\Submission\EntitySubmitResult;
use KTXF\Resource\Filter\IFilter;
use KTXF\Resource\Identifier\CollectionIdentifier;
use KTXF\Resource\Identifier\EntityIdentifier;
use KTXM\Mail\CompositionManager;
use KTXM\Mail\Stores\CompositionStore;
use PHPUnit\Framework\MockObject\Stub;
use PHPUnit\Framework\TestCase;
use Psr\Container\ContainerInterface;

$mailManagerFile = dirname(__DIR__, 4) . '/mail_manager/lib/Manager.php';
if (is_file($mailManagerFile)) {
    require_once $mailManagerFile;
}

final class CompositionSynchronizationTest extends TestCase {

    private const TENANT_ID = 'tenant-1';
    private const USER_ID = 'user-1';
    private const COMPOSITION_ID = 'draft-1';

    private string $rootDir;
    private CompositionStore $compositionStore;

    protected function setUp(): void {
        if (!class_exists(\KTXM\MailManager\Manager::class)) {
            $this->markTestSkipped('mail_manager module is not available alongside this checkout');
        }

        $this->rootDir = sys_get_temp_dir() . '/ktrix-mail-sync-test-' . uniqid('', true);
        mkdir($this->rootDir, 0755, true);
        $this->compositionStore = new CompositionStore($this->rootDir);
    }

    protected function tearDown(): void {
        $this->deleteDir($this->rootDir);
    }

    public function testCreatesDraftInConfiguredCollection(): void {
        $this->stageComposition();
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
        $created = $this->entity('provider', 'service', 'drafts', 'created-1');

        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);
        $mailManager->expects($this->once())
            ->method('entityCreate')
            ->with(
                self::TENANT_ID,
                self::USER_ID,
                $this->callback(static fn(CollectionIdentifier $target): bool => (string)$target === 'provider:service:drafts'),
                $properties,
            )
            ->willReturn($created);

        $compositionManager = $this->compositionManager($mailManager);

        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
        $replayed = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);

        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
        $this->assertSame('saved', $result['disposition']);
        $this->assertSame('saved', $replayed['disposition']);
        $this->assertSame('synced', $snapshot['remote']['status']);
        $this->assertSame('provider:service:drafts:created-1', $snapshot['remote']['entity']);
        $this->assertNull($snapshot['remote']['error']);
    }

    public function testModifiesExistingDraftAndStoresAuthoritativeIdentifier(): void {
        $this->stageComposition('provider:service:drafts:old-1');
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
        $modified = $this->entity('provider', 'service', 'drafts', 'replacement-2');

        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);
        $mailManager->expects($this->once())
            ->method('entityModify')
            ->with(
                self::TENANT_ID,
                self::USER_ID,
                $this->callback(static fn(EntityIdentifier $target): bool => (string)$target === 'provider:service:drafts:old-1'),
                $properties,
            )
            ->willReturn($modified);

        $compositionManager = $this->compositionManager($mailManager);

        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);

        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
        $this->assertSame('saved', $result['disposition']);
        $this->assertSame('provider:service:drafts:replacement-2', $snapshot['remote']['entity']);
    }

    public function testResolvesDraftCollectionByRoleWhenNoTargetIsConfigured(): void {
        $this->stageComposition();
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->mutableService([], $properties);
        $filter = $this->createMock(IFilter::class);
        $filter->expects($this->once())->method('condition')->with('role', 'drafts');
        $service->method('collectionListFilter')->willReturn($filter);
        $collection = $this->createStub(CollectionBaseInterface::class);
        $collection->method('identifier')->willReturn('role-drafts');
        $service->method('collectionList')->willReturn([$collection]);

        $created = $this->entity('provider', 'service', 'role-drafts', 'created-1');
        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);
        $mailManager->expects($this->once())
            ->method('entityCreate')
            ->with(
                self::TENANT_ID,
                self::USER_ID,
                $this->callback(static fn(CollectionIdentifier $target): bool => (string)$target === 'provider:service:role-drafts'),
                $properties,
            )
            ->willReturn($created);

        $compositionManager = $this->compositionManager($mailManager);

        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);

        $this->assertSame('saved', $result['disposition']);
    }

    public function testRecordsFailureWhileKeepingLocalDraftStaged(): void {
        $this->stageComposition();
        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn(null);
        $compositionManager = $this->compositionManager($mailManager);

        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);

        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
        $this->assertSame('staged', $result['disposition']);
        $this->assertArrayHasKey('error', $result);
        $this->assertSame('failed', $snapshot['remote']['status']);
        $this->assertSame($result['error'], $snapshot['remote']['error']);
        $this->assertNull($snapshot['remote']['entity']);
    }

    public function testInlineSaveSynchronizesAndPurgesLocalComposition(): void {
        $this->stageComposition();
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
        $created = $this->entity('provider', 'service', 'drafts', 'created-inline');

        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);
        $mailManager->expects($this->once())
            ->method('entityCreate')
            ->willReturn($created);

        $result = $this->compositionManager($mailManager)->save(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            [
                'revision' => 2,
                'sender' => ['address' => 'sender@example.com'],
                'message' => ['subject' => 'Saved inline'],
            ],
        );

        $this->assertSame('saved', $result['disposition']);
        $this->assertNull($this->compositionStore->compositionFetch(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        ));
    }

    public function testInlineSaveFailureKeepsLocalComposition(): void {
        $this->stageComposition();
        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn(null);

        $result = $this->compositionManager($mailManager)->save(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            [
                'revision' => 2,
                'sender' => ['address' => 'sender@example.com'],
                'message' => ['subject' => 'Keep this draft'],
            ],
        );

        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
        $this->assertSame('error', $result['disposition']);
        $this->assertSame('composition_save_failed', $result['error']['type']);
        $this->assertSame('Keep this draft', $snapshot['message']['subject']);
        $this->assertSame('failed', $snapshot['remote']['status']);
    }

    public function testDiscardDeletesRemoteDraftBeforePurgingLocalComposition(): void {
        $remote = 'provider:service:drafts:remote-1';
        $this->stageComposition($remote);
        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->expects($this->once())
            ->method('entityDelete')
            ->with(
                self::TENANT_ID,
                self::USER_ID,
                $this->callback(static fn(EntityIdentifier $target): bool => (string)$target === $remote),
            )
            ->willReturn([$remote => ['disposition' => 'deleted']]);

        $result = $this->compositionManager($mailManager)->discard(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        );

        $this->assertSame('discarded', $result['disposition']);
        $this->assertNull($this->compositionStore->compositionFetch(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        ));
    }

    public function testRemoteDiscardFailureKeepsLocalComposition(): void {
        $remote = 'provider:service:drafts:remote-1';
        $this->stageComposition($remote);
        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
        $mailManager->method('entityDelete')
            ->willReturn([$remote => ['disposition' => 'error', 'error' => 'Provider unavailable']]);

        $result = $this->compositionManager($mailManager)->discard(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        );

        $this->assertSame('error', $result['disposition']);
        $this->assertSame('Provider unavailable', $result['error']['message']);
        $this->assertNotNull($this->compositionStore->compositionFetch(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        ));
    }

    public function testSendPurgesLocalCompositionOnSuccess(): void {
        $this->stageComposition();
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->submitService($properties);
        $service->method('entitySubmit')->willReturn(new EntitySubmitResult(EntitySubmitResult::DISPOSITION_SENT));

        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);

        $result = $this->compositionManager($mailManager)->send(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            ['address' => 'sender@example.com'],
            ['subject' => 'Sent draft'],
            [],
        );

        $this->assertSame('sent', $result['disposition']);
        $this->assertNull($this->compositionStore->compositionFetch(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        ));
    }

    public function testSendReusesSyncedRemoteDraftAsSubmissionSource(): void {
        $this->stageComposition('provider:service:drafts:remote-1');
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->createMockForIntersectionOfInterfaces([
            ServiceBaseInterface::class,
            ServiceEntitySubmitInterface::class,
        ]);
        $entity = $this->createStub(EntityMutableInterface::class);
        $entity->method('getProperties')->willReturn($properties);
        $service->method('provider')->willReturn('provider');
        $service->method('identifier')->willReturn('service');
        $service->method('getEnabled')->willReturn(true);
        $service->method('entityFresh')->willReturn($entity);
        $service->expects($this->once())
            ->method('entitySubmit')
            ->with(
                $this->anything(),
                $this->callback(static fn(?EntityIdentifier $source): bool => $source !== null
                    && (string)$source === 'provider:service:drafts:remote-1'),
                $properties,
            )
            ->willReturn(new EntitySubmitResult(EntitySubmitResult::DISPOSITION_SENT));

        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);

        $result = $this->compositionManager($mailManager)->send(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            ['address' => 'sender@example.com'],
            ['subject' => 'Sent draft'],
            [],
        );

        $this->assertSame('sent', $result['disposition']);
    }

    public function testSendIgnoresRemoteDraftBelongingToAnotherService(): void {
        $this->stageComposition('provider:other-service:drafts:remote-1');
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->createMockForIntersectionOfInterfaces([
            ServiceBaseInterface::class,
            ServiceEntitySubmitInterface::class,
        ]);
        $entity = $this->createStub(EntityMutableInterface::class);
        $entity->method('getProperties')->willReturn($properties);
        $service->method('provider')->willReturn('provider');
        $service->method('identifier')->willReturn('service');
        $service->method('getEnabled')->willReturn(true);
        $service->method('entityFresh')->willReturn($entity);
        $service->expects($this->once())
            ->method('entitySubmit')
            ->with($this->anything(), $this->isNull(), $properties)
            ->willReturn(new EntitySubmitResult(EntitySubmitResult::DISPOSITION_SENT));

        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);

        $result = $this->compositionManager($mailManager)->send(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            ['address' => 'sender@example.com'],
            ['subject' => 'Sent draft'],
            [],
        );

        $this->assertSame('sent', $result['disposition']);
    }

    public function testSendFailureKeepsLocalComposition(): void {
        $this->stageComposition();
        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
        $service = $this->submitService($properties);
        $service->method('entitySubmit')->willReturn(new EntitySubmitResult(
            EntitySubmitResult::DISPOSITION_ERROR,
            errorMessage: 'Transport unavailable',
        ));

        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
        $mailManager->method('serviceFindByAddress')->willReturn($service);

        $result = $this->compositionManager($mailManager)->send(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            ['address' => 'sender@example.com'],
            ['subject' => 'Keep this draft'],
            [],
        );

        $this->assertSame('error', $result['disposition']);
        $this->assertSame('Transport unavailable', $result['error']['message']);
        $this->assertNotNull($this->compositionStore->compositionFetch(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
        ));
    }

    private function stageComposition(?string $remoteEntity = null): void {
        $saveComposition = static fn(): array => [
            'identifier' => self::COMPOSITION_ID,
            'sender' => ['address' => 'sender@example.com'],
            'message' => ['subject' => 'Draft'],
            'attachments' => [],
            'remote' => [
                'status' => 'dirty',
                'entity' => $remoteEntity,
                'error' => null,
            ],
        ];
        $this->compositionStore->compositionSave(
            self::TENANT_ID,
            self::USER_ID,
            self::COMPOSITION_ID,
            $saveComposition,
        );
    }

    private function mutableService(array $auxiliary, MessagePropertiesMutableInterface $properties): ServiceBaseInterface&ServiceEntityMutableInterface&Stub {
        $service = $this->createStubForIntersectionOfInterfaces([
            ServiceBaseInterface::class,
            ServiceEntityMutableInterface::class,
        ]);
        $entity = $this->createStub(EntityMutableInterface::class);
        $entity->method('getProperties')->willReturn($properties);
        $service->method('provider')->willReturn('provider');
        $service->method('identifier')->willReturn('service');
        $service->method('getEnabled')->willReturn(true);
        $service->method('getAuxiliary')->willReturn($auxiliary);
        $service->method('entityFresh')->willReturn($entity);
        return $service;
    }

    private function submitService(MessagePropertiesMutableInterface $properties): ServiceBaseInterface&ServiceEntitySubmitInterface&Stub {
        $service = $this->createStubForIntersectionOfInterfaces([
            ServiceBaseInterface::class,
            ServiceEntitySubmitInterface::class,
        ]);
        $entity = $this->createStub(EntityMutableInterface::class);
        $entity->method('getProperties')->willReturn($properties);
        $service->method('provider')->willReturn('provider');
        $service->method('identifier')->willReturn('service');
        $service->method('getEnabled')->willReturn(true);
        $service->method('entityFresh')->willReturn($entity);
        return $service;
    }

    private function compositionManager(\KTXM\MailManager\Manager $mailManager): CompositionManager {
        return new CompositionManager(
            container: $this->createStub(ContainerInterface::class),
            moduleManager: $this->createStub(ModuleManager::class),
            compositionStore: $this->compositionStore,
            mailManager: $mailManager,
            events: $this->createStub(EventDispatcherInterface::class),
        );
    }

    private function entity(string $provider, string $service, string $collection, string $identifier): EntityBaseInterface&Stub {
        $entity = $this->createStub(EntityBaseInterface::class);
        $entity->method('provider')->willReturn($provider);
        $entity->method('service')->willReturn($service);
        $entity->method('collection')->willReturn($collection);
        $entity->method('identifier')->willReturn($identifier);
        return $entity;
    }

    private function deleteDir(string $path): void {
        if (!is_dir($path)) {
            return;
        }
        foreach (scandir($path) ?: [] as $entry) {
            if ($entry === '.' || $entry === '..') {
                continue;
            }
            $child = $path . '/' . $entry;
            if (is_dir($child)) {
                $this->deleteDir($child);
            } else {
                unlink($child);
            }
        }
        rmdir($path);
    }
}