<?php
declare(strict_types=1);

namespace App\Domain\Jobcard;

require_once __DIR__ . '/TimeCalculator.php';

final class TimeEntryValidator
{
    public function validate(array $entry): array
    {
        $errors = [];
        $date = trim((string)($entry['work_date'] ?? ''));
        if (!$this->validDate($date)) $errors['work_date'] = 'Work date must be a valid date.';

        $manual = null;
        if (array_key_exists('hours', $entry) && $entry['hours'] !== null) {
            if (!is_numeric($entry['hours'])) {
                $errors['hours'] = 'Hours must be numeric.';
            } else {
                $manual = (float) $entry['hours'];
                if ($manual < 0) $errors['hours'] = 'Hours must not be negative.';
            }
        }
        $start = $entry['start_time'] ?? null;
        $end = $entry['end_time'] ?? null;
        if ($manual === null && (($start === null) xor ($end === null))) {
            $errors['time'] = 'Start and end time must be supplied together.';
        }
        $hours = \calculate_duration_hours($start !== null ? (string)$start : null, $end !== null ? (string)$end : null, $manual);
        if ($hours === null && !isset($errors['hours']) && !isset($errors['time'])) {
            $errors['time'] = 'A positive duration or manual hours is required.';
        }
        return ['valid' => $errors === [], 'hours' => $hours, 'errors' => $errors];
    }

    public function isValid(array $entry): bool
    {
        return $this->validate($entry)['valid'];
    }

    private function validDate(string $date): bool
    {
        $parsed = \DateTimeImmutable::createFromFormat('!Y-m-d', $date);
        return $parsed !== false && $parsed->format('Y-m-d') === $date;
    }
}