<?php

declare(strict_types=1);

namespace RprtCli\Utils\CsvReport;

use RprtCli\Utils\Configuration\ConfigurationInterface;

use function array_key_first;
use function array_keys;
use function fgetcsv;
use function fopen;
use function preg_match;
use function reset;

/**
 * Creates a report of projects and hours.
 */
class CsvReport implements CsvReportInterface
{
    /**
     * A configuration service.
     *
     * @var ConfigurationInterface
     */
    protected $configurationService;

    public function __construct(ConfigurationInterface $config)
    {
        $this->configurationService = $config;
    }

    /**
     * {@inheritdoc}
     */
    public function getReportData(string $filePath) : array
    {
        $output = [];
      // @TODO replace with config service.
      // $config = $this->dummyConfig()['projects'];
        $config = $this->configurationService->get('projects');
        foreach (array_keys($config) as $key) {
            $output[$key] = 0;
        }
        if ($file = fopen($filePath, 'r')) {
            while (($line = fgetcsv($file)) !== false) {
                $parsed = $this->parseCsvFile($line);
              // $key = reset(array_keys($parsed));
                $key = array_key_first($parsed);
                if (isset($output[$key])) {
                    $output[$key] += (int) reset($parsed);
                }
            }
        }
        return $output;
    }

    /**
     * Get correct values from the raw data lines of csv.
     *
     *
     *   Columns with data are specified in config.
     *
     *   Project key and unit of time spent.
     */
    protected function parseCsvFile(array $rawData) : array
    {
        $config = $this->configurationService->get('projects');
        foreach ($config as $key => $project) {
            if (preg_match('/' . $project['pattern'] . '/', $rawData[1])) {
                return [$key => $rawData[4]];
            }
        }
        return [];
    }

    protected function dummyConfig() : array
    {
        return [
            'projects' => [
                'LDP'   => [
                    'name'    => 'lupus.digital',
                    'pattern' => 'LDP-[0-9]+',
                    'price'   => 26,
          // optional specify columns
                ],
                'WV'    => [
                    'name'    => 'Wirtschaftsverlag',
                    'pattern' => 'WV-[0-9]+',
                    'price'   => 26,
          // optional specify columns
                ],
                'Other' => [
                    'name'    => 'Other projects',
                    'pattern' => '(?!.\bLDP\b)(?!.\bWV\b)',
                    'price'   => 26,
          // optional specify columns
                ],
            ],
        ];
    }
}