<?php
/**
 * The MIT License (MIT)
 * 
 * Copyright (c) Taylor Otwell
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Illuminate\Console;

use Illuminate\Support\Str;
use InvalidArgumentException;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputArgument;

class Parser
{
    /**
     * Parse the given console command definition into an array.
     *
     * @param  string  $expression
     * @return array
     *
     * @throws \InvalidArgumentException
     */
    public static function parse($expression)
    {
        $name = static::name($expression);

        if (preg_match_all('/\{\s*(.*?)\s*\}/', $expression, $matches)) {
            if (count($matches[1])) {
                return array_merge([$name], static::parameters($matches[1]));
            }
        }

        return [$name, [], []];
    }

    /**
     * Extract the name of the command from the expression.
     *
     * @param  string  $expression
     * @return string
     */
    protected static function name($expression)
    {
        if (trim($expression) === '') {
            throw new InvalidArgumentException('Console command definition is empty.');
        }

        if (! preg_match('/[^\s]+/', $expression, $matches)) {
            throw new InvalidArgumentException('Unable to determine command name from signature.');
        }

        return $matches[0];
    }

    /**
     * Extract all of the parameters from the tokens.
     *
     * @param  array  $tokens
     * @return array
     */
    protected static function parameters(array $tokens)
    {
        $arguments = [];

        $options = [];

        foreach ($tokens as $token) {
            if (preg_match('/-{2,}(.*)/', $token, $matches)) {
                $options[] = static::parseOption($matches[1]);
            } else {
                $arguments[] = static::parseArgument($token);
            }
        }

        return [$arguments, $options];
    }

    /**
     * Parse an argument expression.
     *
     * @param  string  $token
     * @return \Symfony\Component\Console\Input\InputArgument
     */
    protected static function parseArgument($token)
    {
        list($token, $description) = static::extractDescription($token);

        switch (true) {
            case Str::endsWith($token, '?*'):
                return new InputArgument(trim($token, '?*'), InputArgument::IS_ARRAY, $description);
            case Str::endsWith($token, '*'):
                return new InputArgument(trim($token, '*'), InputArgument::IS_ARRAY | InputArgument::REQUIRED, $description);
            case Str::endsWith($token, '?'):
                return new InputArgument(trim($token, '?'), InputArgument::OPTIONAL, $description);
            case preg_match('/(.+)\=\*(.+)/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::IS_ARRAY, $description, preg_split('/,\s?/', $matches[2]));
            case preg_match('/(.+)\=(.+)/', $token, $matches):
                return new InputArgument($matches[1], InputArgument::OPTIONAL, $description, $matches[2]);
            default:
                return new InputArgument($token, InputArgument::REQUIRED, $description);
        }
    }

    /**
     * Parse an option expression.
     *
     * @param  string  $token
     * @return \Symfony\Component\Console\Input\InputOption
     */
    protected static function parseOption($token)
    {
        list($token, $description) = static::extractDescription($token);

        $matches = preg_split('/\s*\|\s*/', $token, 2);

        if (isset($matches[1])) {
            $shortcut = $matches[0];
            $token = $matches[1];
        } else {
            $shortcut = null;
        }

        switch (true) {
            case Str::endsWith($token, '='):
                return new InputOption(trim($token, '='), $shortcut, InputOption::VALUE_OPTIONAL, $description);
            case Str::endsWith($token, '=*'):
                return new InputOption(trim($token, '=*'), $shortcut, InputOption::VALUE_OPTIONAL | InputOption::VALUE_IS_ARRAY, $description);
            case preg_match('/(.+)\=\*(.+)/', $token, $matches):
                return new InputOption($matches[1], $shortcut, InputOption::VALUE_OPTIONAL | InputOption::VALUE_IS_ARRAY, $description, preg_split('/,\s?/', $matches[2]));
            case preg_match('/(.+)\=(.+)/', $token, $matches):
                return new InputOption($matches[1], $shortcut, InputOption::VALUE_OPTIONAL, $description, $matches[2]);
            default:
                return new InputOption($token, $shortcut, InputOption::VALUE_NONE, $description);
        }
    }

    /**
     * Parse the token into its token and description segments.
     *
     * @param  string  $token
     * @return array
     */
    protected static function extractDescription($token)
    {
        $parts = preg_split('/\s+:\s+/', trim($token), 2);

        return count($parts) === 2 ? $parts : [$token, ''];
    }
}
