<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Config;

use Composer\Json\JsonFile;
use Composer\Json\JsonManipulator;
use Composer\Util\Silencer;

/**
 * JSON Configuration Source
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @author Beau Simensen <beau@dflydev.com>
 */
class JsonConfigSource implements ConfigSourceInterface
{
    /**
     * @var JsonFile
     */
    private $file;

    /**
     * @var bool
     */
    private $authConfig;

    /**
     * Constructor
     *
     * @param JsonFile $file
     * @param bool     $authConfig
     */
    public function __construct(JsonFile $file, $authConfig = false)
    {
        $this->file = $file;
        $this->authConfig = $authConfig;
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return $this->file->getPath();
    }

    /**
     * {@inheritdoc}
     */
    public function addRepository($name, $config)
    {
        $this->manipulateJson('addRepository', $name, $config, function (&$config, $repo, $repoConfig) {
            $config['repositories'][$repo] = $repoConfig;
        });
    }

    /**
     * {@inheritdoc}
     */
    public function removeRepository($name)
    {
        $this->manipulateJson('removeRepository', $name, function (&$config, $repo) {
            unset($config['repositories'][$repo]);
        });
    }

    /**
     * {@inheritdoc}
     */
    public function addConfigSetting($name, $value)
    {
        $authConfig = $this->authConfig;
        $this->manipulateJson('addConfigSetting', $name, $value, function (&$config, $key, $val) use ($authConfig) {
            if (preg_match('{^(github-oauth|gitlab-oauth|http-basic|platform)\.}', $key)) {
                list($key, $host) = explode('.', $key, 2);
                if ($authConfig) {
                    $config[$key][$host] = $val;
                } else {
                    $config['config'][$key][$host] = $val;
                }
            } else {
                $config['config'][$key] = $val;
            }
        });
    }

    /**
     * {@inheritdoc}
     */
    public function removeConfigSetting($name)
    {
        $authConfig = $this->authConfig;
        $this->manipulateJson('removeConfigSetting', $name, function (&$config, $key) use ($authConfig) {
            if (preg_match('{^(github-oauth|gitlab-oauth|http-basic|platform)\.}', $key)) {
                list($key, $host) = explode('.', $key, 2);
                if ($authConfig) {
                    unset($config[$key][$host]);
                } else {
                    unset($config['config'][$key][$host]);
                }
            } else {
                unset($config['config'][$key]);
            }
        });
    }

    /**
     * {@inheritdoc}
     */
    public function addLink($type, $name, $value)
    {
        $this->manipulateJson('addLink', $type, $name, $value, function (&$config, $type, $name, $value) {
            $config[$type][$name] = $value;
        });
    }

    /**
     * {@inheritdoc}
     */
    public function removeLink($type, $name)
    {
        $this->manipulateJson('removeSubNode', $type, $name, function (&$config, $type, $name) {
            unset($config[$type][$name]);
        });
    }

    protected function manipulateJson($method, $args, $fallback)
    {
        $args = func_get_args();
        // remove method & fallback
        array_shift($args);
        $fallback = array_pop($args);

        if ($this->file->exists()) {
            if (!is_writable($this->file->getPath())) {
                throw new \RuntimeException(sprintf('The file "%s" is not writable.', $this->file->getPath()));
            }

            if (!is_readable($this->file->getPath())) {
                throw new \RuntimeException(sprintf('The file "%s" is not readable.', $this->file->getPath()));
            }

            $contents = file_get_contents($this->file->getPath());
        } elseif ($this->authConfig) {
            $contents = "{\n}\n";
        } else {
            $contents = "{\n    \"config\": {\n    }\n}\n";
        }

        $manipulator = new JsonManipulator($contents);

        $newFile = !$this->file->exists();

        // override manipulator method for auth config files
        if ($this->authConfig && $method === 'addConfigSetting') {
            $method = 'addSubNode';
            list($mainNode, $name) = explode('.', $args[0], 2);
            $args = array($mainNode, $name, $args[1]);
        } elseif ($this->authConfig && $method === 'removeConfigSetting') {
            $method = 'removeSubNode';
            list($mainNode, $name) = explode('.', $args[0], 2);
            $args = array($mainNode, $name);
        }

        // try to update cleanly
        if (call_user_func_array(array($manipulator, $method), $args)) {
            file_put_contents($this->file->getPath(), $manipulator->getContents());
        } else {
            // on failed clean update, call the fallback and rewrite the whole file
            $config = $this->file->read();
            $this->arrayUnshiftRef($args, $config);
            call_user_func_array($fallback, $args);
            $this->file->write($config);
        }

        if ($newFile) {
            Silencer::call('chmod', $this->file->getPath(), 0600);
        }
    }

    /**
     * Prepend a reference to an element to the beginning of an array.
     *
     * @param  array $array
     * @param  mixed $value
     * @return array
     */
    private function arrayUnshiftRef(&$array, &$value)
    {
        $return = array_unshift($array, '');
        $array[0] = &$value;

        return $return;
    }
}