#!/usr/bin/env php
<?php

if (file_exists(__DIR__.'/../vendor/autoload.php')) {
    require __DIR__.'/../vendor/autoload.php';
} elseif (file_exists(__DIR__.'/../../../autoload.php')) {
    require __DIR__.'/../../../autoload.php';
}

use Symfony\Component\Console\Application;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Yaml\Yaml;
use Composer\Json\JsonFile;

$console = new Application();
$console
    ->register('convert')
    ->setDefinition(array(
        new InputArgument('from', InputArgument::OPTIONAL, null, 'composer.yml'),
        new InputArgument('to', InputArgument::OPTIONAL, null, 'composer.json'),
    ))
    ->setDescription('Converts a composer.yml to json or vice-versa')
    ->setCode(function (InputInterface $input, OutputInterface $output) {
        $from = $input->getArgument('from');
        $to = $input->getArgument('to');

        $validFormats = array('json', 'yml');

        if ($from && !file_exists($from)) {
            throw new \InvalidArgumentException(sprintf("The input file '%s' does not exist.", $from));
        }

        if ($to && !file_exists($to)) {
            throw new \InvalidArgumentException(sprintf("The output file '%s' does not exist.", $to));
        }

        $inputContent = file_get_contents($from);
        $inputFormat = pathinfo($from, PATHINFO_EXTENSION);

        if (!in_array($inputFormat, $validFormats)) {
            throw new \InvalidArgumentException(
                sprintf("Invalid input format '%s', must be one of: %s", $inputFormat, implode(', ', $validFormats)));
        }

        $outputFormat = pathinfo($to, PATHINFO_EXTENSION);

        if (!in_array($outputFormat, $validFormats)) {
            throw new \InvalidArgumentException(
                sprintf("Invalid output format '%s', must be one of: %s", $outputFormat, implode(', ', $validFormats)));
        }

        if ($outputFormat === $inputFormat) {
            throw new \InvalidArgumentException('Input format is same as output format.');
        }

        if ('json' === $inputFormat) {
            $data = JsonFile::parseJson($inputContent);
        } elseif ('yml' === $inputFormat) {
            $data = Yaml::parse($inputContent);
        }

        if ('json' === $outputFormat) {
            $outputContent = JsonFile::encode($data)."\n";
        } else {
            $outputContent = Yaml::dump($data);
        }

        file_put_contents($to, $outputContent);
    })
;

$console->run();