<?php declare(strict_types=1);

use Nechaev\Reports\Features\Reports\ReportsApi;

require_once __DIR__ . '/../init.php';

header('Content-Type: application/json; charset=utf-8');

/**
 * @return array<int, string>
 */
function parseStringList(mixed $value): array {
    if ($value === null || $value === '') {
        return [];
    }

    $items = is_array($value) ? $value : [$value];

    return array_values(array_filter(array_map('strval', $items), static fn (string $item): bool => $item !== ''));
}

/**
 * @return array<int, int>
 */
function parseIntList(mixed $value): array {
    $items = parseStringList($value);

    return array_values(array_filter(array_map('intval', $items), static fn (int $item): bool => $item > 0));
}

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
$path = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH) ?: '/';

if ($method === 'OPTIONS') {
    http_response_code(204);
    exit;
}

try {
    $api = new ReportsApi();

    if ($method === 'GET' && $path === '/api/teams') {
        echo json_encode($api->getTeams(), JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && $path === '/api/config') {
        echo json_encode($api->getPublicConfig(), JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && preg_match('#^/api/teams/(\d+)/sprints$#', $path, $matches)) {
        echo json_encode($api->getSprintsByTeamId((int) $matches[1]), JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && preg_match('#^/api/teams/(\d+)/tasks/filters$#', $path, $matches)) {
        $result = $api->getTeamTaskFilterOptions((int) $matches[1]);
        if ($result === null) {
            http_response_code(404);
            echo json_encode(['error' => 'Team not found'], JSON_UNESCAPED_UNICODE);
            exit;
        }
        echo json_encode($result, JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && preg_match('#^/api/teams/(\d+)/tasks$#', $path, $matches)) {
        $page = max(1, (int) ($_GET['page'] ?? 1));
        $perPage = max(1, min(100, (int) ($_GET['per_page'] ?? 50)));
        $result = $api->getTasksByTeamId(
            (int) $matches[1],
            $page,
            $perPage,
            parseStringList($_GET['task_type'] ?? null),
            parseStringList($_GET['assignee'] ?? null),
            parseIntList($_GET['sprint_id'] ?? null)
        );
        if ($result === null) {
            http_response_code(404);
            echo json_encode(['error' => 'Team not found'], JSON_UNESCAPED_UNICODE);
            exit;
        }
        echo json_encode($result, JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && preg_match('#^/api/sprints/(\d+)/tasks$#', $path, $matches)) {
        echo json_encode($api->getTasksBySprintId((int) $matches[1]), JSON_UNESCAPED_UNICODE);
        exit;
    }

    if ($method === 'GET' && preg_match('#^/api/sprints/(\d+)$#', $path, $matches)) {
        $sprint = $api->getSprintById((int) $matches[1]);
        if ($sprint === null) {
            http_response_code(404);
            echo json_encode(['error' => 'Sprint not found'], JSON_UNESCAPED_UNICODE);
            exit;
        }
        echo json_encode($sprint, JSON_UNESCAPED_UNICODE);
        exit;
    }

    http_response_code(404);
    echo json_encode(['error' => 'Not found'], JSON_UNESCAPED_UNICODE);
} catch (Throwable $e) {
    http_response_code(500);
    echo json_encode(['error' => $e->getMessage()], JSON_UNESCAPED_UNICODE);
}