project-manager/src/Http/Controllers/CardController.php

<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Exception\ApiException;
use App\Repository\CardRepository;
use App\Repository\CardStatusRepository;
use App\Repository\ProjectRepository;
use App\Support\Validator;
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;

/**
 * CRUD for the cards within one project. Every route first checks that the
 * parent project is owned by the authenticated user; otherwise it responds 404.
 */
final class CardController extends Controller
{
    private const TEXT_MAX = 1000;

    public function __construct(
        private readonly ProjectRepository $projects,
        private readonly CardRepository $cards,
        private readonly CardStatusRepository $statuses,
    ) {
    }

    /**
     * GET /api/projects/{projectId}/cards
     */
    public function index(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);

        return $this->json($response, [
            'cards' => array_map($this->present(...), $this->cards->allForProject($projectId)),
        ]);
    }

    /**
     * POST /api/projects/{projectId}/cards
     */
    public function store(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);

        $validator = new Validator($this->body($request));
        $text = $validator->requiredString('text', self::TEXT_MAX);
        $complete = $validator->optionalBool('complete') ?? false;
        $position = $validator->optionalInt('position', 0);
        $validator->assert();

        $card = $this->cards->create($projectId, $text, $complete, $position);
        $this->projects->touch($projectId);

        return $this->json($response, ['card' => $this->present($card)], 201);
    }

    /**
     * GET /api/projects/{projectId}/cards/{cardId}
     */
    public function show(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);

        return $this->json($response, ['card' => $this->present($this->requireCard($projectId, $args))]);
    }

    /**
     * PATCH /api/projects/{projectId}/cards/{cardId}
     */
    public function update(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);
        $card = $this->requireCard($projectId, $args);

        $validator = new Validator($this->body($request));
        $fields = [];
        if ($validator->has('text')) {
            $fields['text'] = $validator->requiredString('text', self::TEXT_MAX);
        }
        if ($validator->has('complete')) {
            $fields['complete'] = $validator->optionalBool('complete');
        }
        if ($validator->has('status_id')) {
            $statusId = $validator->nullableInt('status_id', 1);
            if ($statusId !== null && !$validator->failed()
                && $this->statuses->findInProject($statusId, $projectId) === null
            ) {
                $validator->add('status_id', 'That status does not belong to this project.');
            }
            $fields['status_id'] = $statusId;
        }
        if ($fields === [] && !$validator->failed()) {
            $validator->add('text', 'Provide at least one of: text, complete, status_id.');
        }
        $validator->assert();

        $updated = $this->cards->update($card['id'], $projectId, $fields);
        $this->projects->touch($projectId);

        return $this->json($response, ['card' => $this->present($updated)]);
    }

    /**
     * DELETE /api/projects/{projectId}/cards/{cardId}
     */
    public function destroy(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);
        $this->cards->delete($this->requireCard($projectId, $args)['id']);
        $this->projects->touch($projectId);

        return $response->withStatus(204);
    }

    /**
     * PUT /api/projects/{projectId}/cards/order
     *
     * Sets the contents and order of one status column.
     *
     * Body: { "status_id": 2 | null, "card_ids": [3, 1, 2] } — the cards that
     * should make up that column, in order. Positions are rewritten to 0..n-1;
     * any card moved in from another column is re-parented and its old column
     * re-packed. `status_id` is omitted or null for the inbox.
     */
    public function reorder(Request $request, Response $response, array $args): Response
    {
        $projectId = $this->requireOwnedProjectId($request, $args);
        $body = $this->body($request);

        $statusId = null;
        if (array_key_exists('status_id', $body) && $body['status_id'] !== null) {
            if (!is_int($body['status_id'])) {
                throw new ApiException('status_id must be a status ID or null.', 422);
            }
            $statusId = $body['status_id'];
            if ($this->statuses->findInProject($statusId, $projectId) === null) {
                throw new ApiException('That status does not belong to this project.', 422);
            }
        }

        $order = $body['card_ids'] ?? null;
        if (!is_array($order) || array_filter($order, static fn ($id) => !is_int($id)) !== []) {
            throw new ApiException('card_ids must be an array of card IDs.', 422);
        }
        /** @var int[] $order */
        if (count($order) !== count(array_unique($order))) {
            throw new ApiException('card_ids must not contain duplicates.', 422);
        }
        if (array_diff($order, $this->cards->idsForProject($projectId)) !== []) {
            throw new ApiException('Every card_id must be a card in this project.', 422);
        }
        if (array_diff($this->cards->idsInColumn($projectId, $statusId), $order) !== []) {
            throw new ApiException('card_ids must include every card already in this column.', 422);
        }

        $cards = $this->cards->orderColumn($projectId, $statusId, $order);
        $this->projects->touch($projectId);

        return $this->json($response, ['cards' => array_map($this->present(...), $cards)]);
    }

    /**
     * @param array<string, string> $args
     */
    private function requireOwnedProjectId(Request $request, array $args): int
    {
        $project = $this->projects->findOwnedBy((int) $args['projectId'], $this->user($request)['id']);

        if ($project === null) {
            throw new ApiException('Project not found.', 404);
        }

        return $project['id'];
    }

    /**
     * @param array<string, string> $args
     * @return array{id: int, project_id: int, text: string, complete: bool, position: int, status_id: int|null, status: array{id: int, name: string}|null, created_at: string, updated_at: string}
     */
    private function requireCard(int $projectId, array $args): array
    {
        $card = $this->cards->findInProject((int) $args['cardId'], $projectId);

        if ($card === null) {
            throw new ApiException('Card not found.', 404);
        }

        return $card;
    }

    /**
     * @param array{id: int, project_id: int, text: string, complete: bool, position: int, status_id: int|null, status: array{id: int, name: string}|null, created_at: string, updated_at: string} $card
     * @return array<string, mixed>
     */
    private function present(array $card): array
    {
        return [
            'id' => $card['id'],
            'project_id' => $card['project_id'],
            'text' => $card['text'],
            'complete' => $card['complete'],
            'position' => $card['position'],
            'status_id' => $card['status_id'],
            'status' => $card['status'],
            'created_at' => $card['created_at'],
            'updated_at' => $card['updated_at'],
        ];
    }
}