<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace KTXM\ProviderImap\Console;

use KTXC\Context\TenantContext;
use KTXM\ProviderImap\Providers\Provider;
use KTXM\ProviderImap\Providers\Service;
use KTXM\ProviderImap\Service\Cache\HarmonizationService;
use KTXM\ProviderImap\Stores\MailboxStore;
use KTXM\ProviderImap\Stores\MessageStore;
use Symfony\Component\Console\Attribute\AsCommand;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;

/**
 * Harmonize the cache of a stored IMAP service with its server.
 *
 * Read-only towards the server (EXAMINE, BODY.PEEK); safe to run repeatedly.
 */
#[AsCommand(
    name: 'provider_imap_mail:cache:harmonize',
    description: 'Harmonize the message cache of an IMAP service with its server',
)]
class HarmonizeCommand extends Command
{
    public function __construct(
        private readonly Provider $provider,
        private readonly TenantContext $tenantContext,
        private readonly HarmonizationService $harmonizer,
        private readonly MailboxStore $mailboxStore,
        private readonly MessageStore $messageStore,
    ) {
        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->addArgument('service-id', InputArgument::REQUIRED, 'Stored service ID')
            ->addOption('tenant', 't', InputOption::VALUE_REQUIRED, 'Tenant ID')
            ->addOption('user', 'u', InputOption::VALUE_REQUIRED, 'User ID')
            ->addOption('mailbox', 'm', InputOption::VALUE_REQUIRED, 'Mailbox to harmonize (default: INBOX)')
            ->addOption('all', 'a', InputOption::VALUE_NONE, 'Harmonize every selectable mailbox')
            ->setHelp(<<<'HELP'
                The <info>provider_imap_mail:cache:harmonize</info> command brings the cache of a
                stored IMAP service in line with its server.

                It will:
                    1. Create the cache indexes (idempotent)
                    2. Harmonize the mailbox list
                    3. Harmonize the messages of one mailbox, or of every selectable mailbox with --all

                Server access is read-only: nothing is marked as read.

                Examples:

                Harmonize INBOX:
                <info>provider_imap_mail:cache:harmonize abc123 --tenant=t1 --user=u1</info>

                Harmonize a specific mailbox:
                <info>provider_imap_mail:cache:harmonize abc123 --tenant=t1 --user=u1 --mailbox=Sent</info>

                Harmonize every mailbox:
                <info>provider_imap_mail:cache:harmonize abc123 --tenant=t1 --user=u1 --all</info>
                HELP);
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);

        $tenantId = (string) ($input->getOption('tenant') ?? '');
        $userId = (string) ($input->getOption('user') ?? '');
        $serviceId = (string) $input->getArgument('service-id');
        $mailbox = trim((string) ($input->getOption('mailbox') ?? 'INBOX'));
        $all = (bool) $input->getOption('all');

        $errors = [];
        if ($tenantId === '') {
            $errors[] = 'Tenant ID is required (--tenant).';
        }
        if ($userId === '') {
            $errors[] = 'User ID is required (--user).';
        }
        if ($all && $input->getOption('mailbox') !== null) {
            $errors[] = 'Use either --mailbox or --all, not both.';
        }
        if ($errors !== []) {
            $io->error($errors);
            return Command::FAILURE;
        }

        $this->tenantContext->resolveIdentifier($tenantId);
        $service = $this->provider->serviceFetch($tenantId, $userId, $serviceId);
        if (!$service instanceof Service) {
            $io->error(sprintf("Service '%s' not found.", $serviceId));
            return Command::FAILURE;
        }

        $this->mailboxStore->ensureIndexes();
        $this->messageStore->ensureIndexes();

        $harmonizer = $this->harmonizer->for($service);
        $startedAt = microtime(true);

        try {
            if ($all) {
                $result = $harmonizer->harmonizeAll();
                $mailboxes = $result['mailboxes'];
                $messages = $result['messages'];
            } else {
                $mailboxes = $harmonizer->harmonizeMailboxes();
                $messages = [$mailbox => $harmonizer->harmonizeMessages($mailbox)];
            }
        } catch (\Throwable $e) {
            $io->error('Harmonization failed: ' . $e->getMessage());
            return Command::FAILURE;
        }

        $io->section('Mailboxes');
        $io->definitionList(
            ['Added' => self::names($mailboxes['added'])],
            ['Updated' => count($mailboxes['updated'])],
            ['Removed' => self::names($mailboxes['removed'])],
        );

        $io->section('Messages');
        $rows = [];
        $failed = 0;
        foreach ($messages as $name => $outcome) {
            if (is_string($outcome)) {
                $failed++;
                $rows[] = [$name, '<error>failed</error>', '', '', '', '', $outcome];
                continue;
            }
            $rows[] = [
                $name,
                $outcome['status'],
                $outcome['added'],
                $outcome['updated'],
                $outcome['removed'],
                $outcome['complete'] ? 'yes' : 'no',
                $outcome['reset'] ? 'UIDVALIDITY changed, cache reset' : '',
            ];
        }
        $io->table(['Mailbox', 'Status', 'Added', 'Updated', 'Removed', 'Complete', 'Note'], $rows);

        $io->writeln(sprintf(
            'Cache: <info>storage/%s/provider_imap/%s</info>, MongoDB <info>provider_imap_mail_mailboxes</info> / <info>provider_imap_mail_messages</info>',
            $tenantId,
            $serviceId,
        ));
        $io->writeln(sprintf('Completed in <info>%.2fs</info>', microtime(true) - $startedAt));

        if ($failed > 0) {
            $io->warning(sprintf('%d mailbox(es) failed.', $failed));
            return Command::FAILURE;
        }

        return Command::SUCCESS;
    }

    /**
     * @param string[] $names
     */
    private static function names(array $names): string
    {
        return $names === [] ? '-' : implode(', ', $names);
    }
}