<?php

declare(strict_types=1);

namespace KTXT\ProviderImap\Tests\Unit;

use KTXM\ProviderImap\Client\{Client, ConnectionConfig};
use KTXM\ProviderImap\Client\Transport\{ConnectionInterface, ConnectionFactoryInterface};
use KTXM\ProviderImap\Providers\CollectionResource;
use KTXM\ProviderImap\Providers\ServiceBase;
use KTXM\ProviderImap\Providers\LiveService;
use KTXM\ProviderImap\Service\Live\LiveMailService;
use PHPUnit\Framework\TestCase;

final class CollectionFetchTest extends TestCase
{
    private array $commands = [];

    public function testWithListStatusUsesOneRoundTrip(): void
    {
        $mailbox = $this->service(listStatus: true)->mailboxFetch('INBOX');

        $this->assertCount(1, $this->commands);
        $this->assertStringContainsString('RETURN (STATUS', $this->commands[0]);
        $this->assertSame(3, $mailbox?->messages());
        $this->assertSame(7, $mailbox?->uidValidity());
        $this->assertSame(10, $mailbox?->uidNext());
    }

    public function testWithoutListStatusFallsBackToStatus(): void
    {
        $mailbox = $this->service(listStatus: false)->mailboxFetch('INBOX');

        $this->assertCount(2, $this->commands);
        $this->assertStringNotContainsString('RETURN', $this->commands[0]);
        $this->assertStringStartsWith('STATUS', $this->commands[1]);
        $this->assertSame(3, $mailbox?->messages());
        $this->assertSame(7, $mailbox?->uidValidity());
        $this->assertSame(10, $mailbox?->uidNext());
    }

    public function testUnknownMailboxIsNull(): void
    {
        $this->assertNull($this->service(listStatus: false, exists: false)->mailboxFetch('Missing'));
    }

    public function testCollectionsAreResourcesKeyedByName(): void
    {
        $service = $this->service(listStatus: true);

        $list = $service->collectionList();
        $collection = $service->collectionFetch('INBOX');

        $this->assertSame(['INBOX'], array_keys($list));
        $this->assertInstanceOf(CollectionResource::class, $list['INBOX']);
        $this->assertInstanceOf(CollectionResource::class, $collection);
        $this->assertSame('INBOX', $collection?->identifier());
        $this->assertNull($this->service(listStatus: true, exists: false)->collectionFetch('Missing'));
    }

    public function testDelimiterIsReadWithoutListingMailboxes(): void
    {
        $this->assertSame('/', $this->service(listStatus: false)->collectionDelimiter());
        $this->assertSame(['LIST "" ""'], $this->commands);
    }

    public function testCollectionExtantReportsMissingMailboxes(): void
    {
        $service = new LiveService();
        $live = $this->service(listStatus: true, exists: false);
        (new \ReflectionProperty(LiveService::class, 'mailService'))->setValue($service, $live);

        $this->assertSame(['Missing' => false], $service->collectionExtant('Missing'));
    }

    private function service(bool $listStatus, bool $exists = true): LiveMailService
    {
        $lines = ["* PREAUTH Ready\r\n"];
        $connection = $this->createStub(ConnectionInterface::class);
        $connection->method('readLine')->willReturnCallback(static function () use (&$lines): string {
            return array_shift($lines) ?? throw new \RuntimeException('Unexpected response read');
        });
        $connection->method('write')->willReturnCallback(function (string $wire) use (&$lines, $listStatus, $exists): void {
            [$tag, $command] = explode(' ', trim($wire), 2);
            $operation = explode(' ', $command)[0];
            if ($operation === 'CAPABILITY') {
                $lines[] = '* CAPABILITY IMAP4rev1' . ($listStatus ? ' LIST-STATUS' : '') . "\r\n";
            } else {
                $this->commands[] = $command;
            }
            if ($operation === 'LIST' && $command === 'LIST "" ""') {
                $lines[] = "* LIST (\\Noselect) \"/\" \"\"\r\n";
                $lines[] = "$tag OK Completed\r\n";
                return;
            }
            if ($operation === 'LIST') {
                if (!$listStatus && str_contains($command, 'RETURN')) {
                    $lines[] = "$tag BAD Unknown RETURN option\r\n";
                    return;
                }
                if ($exists) {
                    $lines[] = "* LIST (\\HasNoChildren) \"/\" \"INBOX\"\r\n";
                    if ($listStatus) {
                        $lines[] = "* STATUS \"INBOX\" (MESSAGES 3 UNSEEN 1 UIDNEXT 10 UIDVALIDITY 7)\r\n";
                    }
                }
            }
            if ($operation === 'STATUS') {
                $lines[] = "* STATUS \"INBOX\" (MESSAGES 3 UNSEEN 1 UIDNEXT 10 UIDVALIDITY 7)\r\n";
            }
            $lines[] = "$tag OK Completed\r\n";
        });
        $factory = $this->createStub(ConnectionFactoryInterface::class);
        $factory->method('create')->willReturn($connection);

        $client = new Client($factory);
        $client->connect(new ConnectionConfig('localhost'));

        return new class($this->createStub(ServiceBase::class), $client) extends LiveMailService {
            public function __construct(ServiceBase $service, private readonly Client $client)
            {
                parent::__construct($service);
            }

            public function imapClient(): Client
            {
                return $this->client;
            }
        };
    }
}