<?php

namespace LakeDrops\Component\Composer;

use Composer\Composer;
use Composer\Json\JsonFile;

/**
 * Manages composer.json files.
 */
final class Utils {

  /**
   * The composer object running this session.
   *
   * @var \Composer\Composer
   */
  protected $composer;

  /**
   * Content of the composer.json file.
   *
   * @var array
   */
  protected $content;

  /**
   * The path of the directory of the composer.json file.
   *
   * @var string
   */
  protected $sourcePath;

  /**
   * The full filename of the composer.json file.
   *
   * @var string
   */
  protected $composerJsonPath;

  /**
   * Utils constructor.
   *
   * @param \Composer\Composer $composer
   *   The composer object running this session.
   * @param string|null $sourcePath
   *   The path name if not the project's root directory.
   */
  public function __construct(Composer $composer, $sourcePath = NULL) {
    $this->composer = $composer;
    $this->sourcePath = isset($sourcePath) ?
      $sourcePath :
      getcwd() . $composer->getPackage()->getTargetDir();
    $this->composerJsonPath = $this->sourcePath . '/composer.json';
    $this->read();
  }

  /**
   * Read the current content of the project's composer.json file.
   *
   * @return $this
   */
  public function read() {
    $this->content = [];
    if (file_exists($this->composerJsonPath)) {
      $jsonFile = new JsonFile($this->composerJsonPath);
      $this->content = $jsonFile->read();
    }
    return $this;
  }

  /**
   * Write the config to composer.json file.
   *
   * @return $this
   */
  public function write() {
    $jsonFile = new JsonFile($this->composerJsonPath);
    if (file_exists($this->composerJsonPath)) {
      $content = $jsonFile->read();
      if (md5(json_encode($content)) === md5(json_encode($this->content))) {
        // Nothing has changed.
        return $this;
      }
    }
    try {
      $jsonFile->write($this->content);
    }
    catch (\Exception $ex) {
      // Let's ignore this, if composer.json is read-only there is a general problem.
    }
    return $this;
  }

  /**
   * Get settings for [$key].
   *
   * @param string $key
   *   The key for the section.
   *
   * @return array|string
   *   The settings of the key.
   */
  public function getSection($key) {
    return isset($this->content[$key]) ? $this->content[$key] : [];
  }

  /**
   * Get settings for [$key1][$key2].
   *
   * @param string $key1
   *   The key for the section.
   * @param string $key2
   *   The key for the sub-section.
   *
   * @return array|string
   *   The settings of the key.
   */
  public function getSubSection($key1, $key2) {
    $section = $this->getSection($key1);
    return isset($section[$key2]) ? $section[$key2] : [];
  }

  /**
   * Get settings for [$key1][$key2][$key3].
   *
   * @param string $key1
   *   The key for the section.
   * @param string $key2
   *   The key for the sub-section.
   * @param string $key3
   *   The key for the sub-sub-section.
   *
   * @return array|string
   *   The settings of the key.
   */
  public function getSubSubSection($key1, $key2, $key3) {
    $subSection = $this->getSubSection($key1, $key2);
    return isset($subSection[$key3]) ? $subSection[$key3] : [];
  }

  /**
   * Set settings for [$key].
   *
   * @param string $key
   *   The key for the section.
   * @param array|string $value
   *   The value for the section.
   *
   * @return $this
   */
  public function setSection($key, $value) {
    $this->content[$key] = $value;
    return $this;
  }

  /**
   * Set settings for [$key1][$key2].
   *
   * @param string $key1
   *   The key for the section.
   * @param string $key2
   *   The key for the sub-section.
   * @param array|string $value
   *   The value for the sub-section.
   *
   * @return $this
   */
  public function setSubSection($key1, $key2, $value) {
    $this->content[$key1][$key2] = $value;
    return $this;
  }

}