<?php

namespace Configula\Loader;

use Configula\ConfigLoaderInterface;
use Configula\ConfigValues;
use Configula\Filter\ExtractTopLevelItemsFilter;
use Configula\Filter\RemovePrefixFilter;
use Dflydev\DotAccessData\Data;

/**
 * Env Loader
 *
 * Loads configuration from each environment variable
 *
 * @package Configula\Loader
 */
final class EnvLoader implements ConfigLoaderInterface
{
	/** @var string */
	private $regex;

	/** @var null|string */
	private $delimiter;

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


	/**
	 * Load from environment looking only for those values with a specified prefix (and remove prefix)
	 *
	 * @param  string      $prefix    Specify a prefix, and only environment variables with this prefix will be read
	 *                                (e.g. "MYAPP_" means that this will only read env vars starting with
	 *                                "MYAPP_")' Values will be
	 * @param  string      $delimiter Split variable names on this string into a nested array.  (e.g. "MYSQL_HOST"
	 *                                would become the key, "MYSQL.HOST" (empty string to not delimit)
	 * @param  bool        $toLower   Convert all keys to lower-case
	 * @return ConfigValues
	 */
	public static function loadUsingPrefix(string $prefix, string $delimiter = '', bool $toLower = false)
	{
		$prefix = preg_quote($prefix);
		$values = (new static("/^{$prefix}/", $delimiter, $toLower))->load();

		return $delimiter
		    ? (new ExtractTopLevelItemsFilter($toLower ? strtolower($prefix) : $prefix, $delimiter))->__invoke($values)
		    : (new RemovePrefixFilter($toLower ? strtolower($prefix) : $prefix))->__invoke($values);
	}


	/**
	 * Environment Loader Constructor
	 *
	 * @param string      $regex     Optionally filter values based on some regex pattern
	 * @param string      $delimiter Split variable names on this string into a nested array.  (e.g. "MYSQL_HOST"
	 *                               would become the key, "MYSQL.HOST" (empty string to not delimit)
	 * @param bool        $toLower   Convert all keys to lower-case
	 */
	public function __construct(string $regex = '', string $delimiter = '', bool $toLower = false)
	{
		$this->regex     = $regex;
		$this->delimiter = $delimiter;
		$this->toLower   = $toLower;
	}


	/**
	 * @return ConfigValues
	 */
	public function load(): ConfigValues
	{
		$configValues = new Data();

		// Make sure we capture *ALL* environment values
		$envValues = array_merge(getenv(), $_ENV);

		foreach ($envValues as $valName => $valVal) {
		    if ($this->regex && ! preg_match($this->regex, $valName)) {
		        continue;
		    }

		    $valName = ($this->delimiter) ? str_replace($this->delimiter, '.', $valName) : $valName;
		    $valName = ($this->toLower) ? strtolower($valName) : $valName;
		    $configValues->set($valName, $this->prepareVal((string) $valVal));
		}

		return new ConfigValues($configValues->export());
	}


	/**
	 * Prepare string value
	 *
	 * @param  string $value
	 * @return mixed
	 */
	private function prepareVal(string $value)
	{
		if (is_numeric($value)) {
		    return filter_var($value, FILTER_VALIDATE_INT) !== false ? (int) $value : (float) $value;
		}

		switch (strtolower($value)) {
		    case 'null':
		        return null;
		    case 'false':
		        return false;
		    case 'true':
		        return true;
		    default:
		        return $value;
		}
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----OTg1MjE4NzA3NDU1MzQwNiAxODU3MDUzNjU5NjkyNzU0IDQzMDQ4MzI1NzAwOTA3NDA=