<?php

declare(strict_types=1);

namespace KTXT\ProviderImap\Tests\Unit;

use KTXC\Db\DataStore;
use KTXF\Mail\Collection\CollectionRoles;
use KTXM\ProviderImap\Client\Mailbox;
use KTXM\ProviderImap\Providers\CachedService;
use KTXM\ProviderImap\Providers\MessageProperties;
use KTXM\ProviderImap\Service\Cache\HarmonizationService;
use KTXM\ProviderImap\Service\Cache\MessageDeltaService;
use KTXM\ProviderImap\Service\Cache\MessageIngestor;
use KTXM\ProviderImap\Service\Live\LiveMailService;
use KTXF\Resource\Identifier\EntityIdentifier;
use KTXT\ProviderImap\Tests\Support\FakeLiveMailService;
use KTXT\ProviderImap\Tests\Support\FakeMailboxStore;
use KTXT\ProviderImap\Tests\Support\FakeMessageFileStore;
use KTXT\ProviderImap\Tests\Support\FakeMessageStore;
use PHPUnit\Framework\TestCase;

final class CachedServiceTest extends TestCase
{
    private FakeMailboxStore $mailboxes;
    private FakeLiveMailService $live;
    private CachedService $service;

    protected function setUp(): void
    {
        $dataStore = $this->createStub(DataStore::class);
        $this->mailboxes = new FakeMailboxStore($dataStore);
        $messages = new FakeMessageStore($dataStore);
        $files = new FakeMessageFileStore('/nonexistent');

        $harmonizer = new HarmonizationService(
            $this->mailboxes,
            $messages,
            $files,
            new MessageIngestor($files, $messages, $this->mailboxes),
        );

        $this->service = new CachedServiceTestDouble(
            $this->mailboxes,
            $harmonizer,
            new MessageDeltaService($this->mailboxes, $messages),
        );
        $this->service->fromStore(['tid' => 'tenant', 'sid' => 'svc']);

        $this->live = new FakeLiveMailService($this->service);
        $this->live->uidValidity = 7;
        $this->live->uidNext = 10;
        $this->live->mailboxList = [new Mailbox('INBOX', '/', []), new Mailbox('Sent', '/', ['\\Sent'])];
        $this->service->liveMail = $this->live;
    }

    public function testCollectionListComesFromTheCacheAfterHarmonizingTheList(): void
    {
        $list = $this->service->collectionList(null);

        $this->assertSame(['INBOX', 'Sent'], array_keys($list));
        $this->assertSame(CollectionRoles::Sent, $list['Sent']->getProperties()->getRole());
        $this->assertCount(1, $this->listCalls());
    }

    public function testFreshListIsNotHarmonizedAgain(): void
    {
        $this->service->collectionList(null);
        $this->service->collectionList(null);
        $this->service->collectionFetch('INBOX');

        $this->assertCount(1, $this->listCalls());
    }

    public function testStaleListIsHarmonizedAgain(): void
    {
        $this->mailboxes->clock = time() - CachedService::FRESHNESS_WINDOW - 1;
        $this->service->collectionList(null);
        $this->mailboxes->clock = null;

        $this->live->mailboxList[] = new Mailbox('Archive', '/', []);
        $list = $this->service->collectionList(null);

        $this->assertSame(['INBOX', 'Sent', 'Archive'], array_keys($list));
        $this->assertCount(2, $this->listCalls());
    }

    public function testFilteredListGoesToTheServer(): void
    {
        $filter = $this->service->collectionListFilter();
        $filter->condition('role', CollectionRoles::Sent->value);

        $this->service->collectionList(null, $filter);

        $this->assertSame([['collectionList', [null, $filter]]], $this->live->calls);
    }

    public function testCollectionSignatureIsTheDeltaSignature(): void
    {
        $this->live->flags = [1 => [], 2 => []];
        $this->service->entityDelta('INBOX', '');

        $this->assertSame('7:2', $this->service->collectionFetch('INBOX')?->signature());
    }

    public function testCollectionExtantUsesTheCache(): void
    {
        $this->assertSame(['INBOX' => true, 'Missing' => false], $this->service->collectionExtant('INBOX', 'Missing'));
    }

    public function testDeltaHarmonizesWhenStaleOnly(): void
    {
        $this->live->flags = [1 => []];
        $first = $this->service->entityDelta('INBOX', '');

        $this->live->flags = [1 => [], 2 => []];
        $second = $this->service->entityDelta('INBOX', $first->signature);

        $this->assertSame('7:1', $first->signature);
        $this->assertSame('7:1', $second->signature, 'fresh mailbox is not harmonized again');

        $this->mailboxes->updateState('svc', 'INBOX', ['harmonizedAt' => time() - CachedService::FRESHNESS_WINDOW]);
        $third = $this->service->entityDelta('INBOX', $first->signature);

        $this->assertSame('7:2', $third->signature);
        $this->assertSame(['2'], json_decode(json_encode($third->additions), true));
    }

    public function testDeltaIsAnsweredFromTheCacheWhenTheServerFails(): void
    {
        $this->live->flags = [1 => []];
        $signature = $this->service->entityDelta('INBOX', '')->signature;

        $this->mailboxes->updateState('svc', 'INBOX', ['harmonizedAt' => 0]);
        $this->live->uidValidity = null; // harmonization throws

        $this->assertSame($signature, $this->service->entityDelta('INBOX', $signature)->signature);
    }

    public function testWritesGoThroughTheLiveService(): void
    {
        $properties = new MessageProperties([]);
        $properties->setFlag('seen', true);

        $this->service->entityPatch($properties, new EntityIdentifier('imap', 'svc', 'INBOX', '5'));

        $patches = array_values(array_filter($this->live->calls, static fn (array $call): bool => $call[0] === 'entityPatch'));
        $this->assertCount(1, $patches);
        [$collection, $added, , $uids] = $patches[0][1];
        $this->assertSame('INBOX', $collection);
        $this->assertContains('seen', $added);
        $this->assertSame([5], $uids);
    }

    /**
     * @return list<array>
     */
    private function listCalls(): array
    {
        return array_values(array_filter($this->live->calls, static fn (array $call): bool => $call[0] === 'collectionList'));
    }
}

/**
 * CachedService with a replaceable IMAP side.
 */
final class CachedServiceTestDouble extends CachedService
{
    public ?LiveMailService $liveMail = null;

    protected function liveMail(): LiveMailService
    {
        return $this->liveMail;
    }
}