<?php

declare(strict_types=1);

namespace App\Mcp\Tool\TimeEntry;

use App\Entity\TimeEntry;
use App\Repository\ProjectRepository;
use App\Repository\TaskRepository;
use App\Repository\TaskTagRepository;
use App\Repository\TimeEntryRepository;
use App\Repository\UserRepository;
use DateTimeImmutable;
use Doctrine\ORM\EntityManagerInterface;
use InvalidArgumentException;
use Mcp\Capability\Attribute\McpTool;

use function sprintf;

#[McpTool(name: 'create-time-entry', description: 'Create a time entry. If stoppedAt is null, creates an active timer. Only one active timer per user is allowed.')]
class CreateTimeEntryTool
{
    public function __construct(
        private readonly EntityManagerInterface $entityManager,
        private readonly UserRepository $userRepository,
        private readonly ProjectRepository $projectRepository,
        private readonly TaskRepository $taskRepository,
        private readonly TaskTagRepository $taskTagRepository,
        private readonly TimeEntryRepository $timeEntryRepository,
    ) {}

    public function __invoke(
        int $userId,
        string $startedAt,
        ?string $title = null,
        ?string $stoppedAt = null,
        ?int $projectId = null,
        ?int $taskId = null,
        ?array $tagIds = null,
        ?string $description = null,
    ): string {
        $user = $this->userRepository->find($userId);
        if (null === $user) {
            throw new InvalidArgumentException(sprintf('User with ID %d not found.', $userId));
        }

        // Check for existing active timer if creating a new active one
        if (null === $stoppedAt) {
            $activeEntry = $this->timeEntryRepository->findActiveByUser($user);
            if (null !== $activeEntry) {
                throw new InvalidArgumentException(sprintf('User "%s" already has an active timer (ID %d). Stop it before starting a new one.', $user->getUsername(), $activeEntry->getId()));
            }
        }

        $entry = new TimeEntry();
        $entry->setUser($user);
        $entry->setStartedAt(new DateTimeImmutable($startedAt));

        if (null !== $title) {
            $entry->setTitle($title);
        }
        if (null !== $stoppedAt) {
            $entry->setStoppedAt(new DateTimeImmutable($stoppedAt));
        }
        if (null !== $description) {
            $entry->setDescription($description);
        }
        if (null !== $projectId) {
            $project = $this->projectRepository->find($projectId);
            if (null === $project) {
                throw new InvalidArgumentException(sprintf('Project with ID %d not found.', $projectId));
            }
            $entry->setProject($project);
        }
        if (null !== $taskId) {
            $task = $this->taskRepository->find($taskId);
            if (null === $task) {
                throw new InvalidArgumentException(sprintf('Task with ID %d not found.', $taskId));
            }
            $entry->setTask($task);
        }
        if (null !== $tagIds) {
            foreach ($tagIds as $tagId) {
                $tag = $this->taskTagRepository->find($tagId);
                if (null === $tag) {
                    throw new InvalidArgumentException(sprintf('TaskTag with ID %d not found.', $tagId));
                }
                $entry->addTag($tag);
            }
        }

        $this->entityManager->persist($entry);
        $this->entityManager->flush();

        return json_encode([
            'id'          => $entry->getId(),
            'title'       => $entry->getTitle(),
            'description' => $entry->getDescription(),
            'startedAt'   => $entry->getStartedAt()?->format('c'),
            'stoppedAt'   => $entry->getStoppedAt()?->format('c'),
            'duration'    => $entry->getStoppedAt() && $entry->getStartedAt()
                ? (int) round(($entry->getStoppedAt()->getTimestamp() - $entry->getStartedAt()->getTimestamp()) / 60)
                : null,
            'user'    => ['id' => $user->getId(), 'username' => $user->getUsername()],
            'project' => $entry->getProject() ? [
                'id'   => $entry->getProject()->getId(),
                'code' => $entry->getProject()->getCode(),
                'name' => $entry->getProject()->getName(),
            ] : null,
            'task' => $entry->getTask() ? [
                'id'     => $entry->getTask()->getId(),
                'number' => $entry->getTask()->getNumber(),
                'title'  => $entry->getTask()->getTitle(),
            ] : null,
            'tags' => $entry->getTags()->map(fn ($t) => [
                'id'    => $t->getId(),
                'label' => $t->getLabel(),
            ])->toArray(),
        ]);
    }
}