<?php
namespace Aldarien\Common\Service;

class Config implements \ArrayAccess {
  protected $folder;
  public function __construct(string $config_folder) {
    if (!file_exists($config_folder)) {
      throw new \InvalidArgumentException("\$config_folder for Config does not exist.");
    }
    $this->folder = $config_folder;
  }
  public function load() {
    $files = new \DirectoryIterator($this->folder);
    foreach ($files as $file) {
      if ($file->isDir()) {
        continue;
      }
      $this->loadFile($file);
    }
    return $this;
  }
  protected $files;
  protected function loadFile(\SplFileInfo $file): void {
    $ext = $file->getExtension();
    $name = strtolower(str_replace(' ', '_', $file->getBasename('.' . $ext)));
    $class = implode("\\", [
      'Aldarien',
      'Config',
      str_replace('YML', 'YAML', strtoupper($ext))
    ]);
    if (!class_exists($class)) {
      return;
    }
    $obj = new $class();
    $obj->setName($name);
    $obj->setFilename($file->getRealPath());
    if ($this->files === null) {
      $this->files = [];
    }
    $this->files []= $obj;
  }
  public function get(string $name, $default = null) {
    foreach ($this->files as $obj) {
      if (!$obj->isLoaded()) {
        $obj->load();
      }
      if ($obj->has($name)) {
        return $obj->get($name);
      }
    }
    return $default;
  }
  public function set(string $name, $value) {
    if (strpos($name, '.') === false) {
      return false;
    }
    $arr = explode('.', $name);
    $file = array_shift($arr);
    $name = implode('.', $arr);
    $this->files[$file]->set($name, $value);
  }
  public function remove(string $name) {
  }
  public function toArray() {
    $arr = [];
    foreach ($this->files as $obj) {
      if (!$obj->isLoaded()) {
        $obj->load();
      }
      $arr = array_merge($arr, $obj->toArray());
    }
    return $arr;
  }
  public function offsetExists($offset): bool {
    return $this->has($offset);
  }
  public function offsetGet($offset) {
    return $this->get($offset);
  }
  public function offsetSet($offset, $value) {
    $this->set($offset, $value);
  }
  public function offsetUnset ($offset) {
    $this->remove($offset);
  }
}