<?php

class argParsed
{
    public function __construct(
        private array $parsed = [],
    ) {}

    public function initOptions(array $options, mixed $default = false): self
    {
        foreach (array_keys($options) as $name) {
            $this->set($name, $default);
        }

        return $this;
    }

    public function get(string $key, mixed $default = null): mixed
    {
        return $this->parsed[$key] ?? $default;
    }

    public function set(string $key, mixed $value): self
    {
        $this->parsed[$key] = $value;
        return $this;
    }
}

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 $argv): argParsed|false
    {
        array_shift($argv); // shift the script name

        $parsed = (new argParsed())->initOptions($this->options);
        while (str_starts_with($argv[0] ?? '', '-')) {
            $option = substr($argv[0], 1);
            if ($this->options[$option]) {
                $parsed->set($option, true);
            }
            array_shift($argv);
        }
        if (count($argv) !== count($this->arguments)) {
            return false;
        }
        foreach ($this->arguments as $arg => $description) {
            $parsed->set($arg, array_shift($argv));
        }

        return $parsed;
    }
}