<?php

readonly class argvParser
{
    /**
     * @param array<string, string> $options
     * @param array<string, string> $arguments
     */
    public function __construct(
        private array $options = [],
        private array $arguments = [],
    ) {}

    public function getOptionsHelp(): string
    {
        $line = '';
        foreach ($this->options as $option => $description) {
            $line .= sprintf('[-%s (%s)] ', $option, $description);
        }
        foreach ($this->arguments as $argument => $description) {
            $line .= sprintf('<%s (%s)> ', $argument, $description);
        }
        return $line;
    }

    public function parseArgv(array $argv): false|array
    {
        array_shift($argv); // shift the script name
        if (count($argv) === 0) {
            return false;
        }

        $parsed = array_map(fn() => false, $this->options);
        while (str_starts_with($argv[0], '-')) {
            $option = substr($argv[0], 1);
            if ($this->options[$option]) {
                $parsed[$option] = true;
            }
            array_shift($argv);
        }
        if (count($argv) !== count($this->arguments)) {
            return false;
        }
        foreach ($this->arguments as $arg => $description) {
            $parsed[$arg] = array_shift($argv);
        }

        return $parsed;
    }
}