<?php

class Amcsi_HttpProxy_Env
{
	protected $input;
	protected $server;
	protected $requestHeaders;
	protected $url;
	protected $requestUri;
	protected $hostOrIp;
	protected $pathInfo;


	public function __construct($input, array $server, array $requestHeaders)
	{
		$this->input = $input;
		$this->server = $server;
		$this->requestHeaders = $requestHeaders;
	}


	public function getPathInfo()
	{
		if (!$this->pathInfo) {
		    $pathInfo = $this->getEnv('PATH_INFO');
		    if (false !== strpos($pathInfo, '?')) {
		        $msg = "PATH_INFO cannot have a (?) mark in it. Currently it is: $pathInfo";
		        throw new LogicException($msg);
		    }
		    $this->pathInfo = $pathInfo;
		}
		return $this->pathInfo;
	}


	/**
	 * getUrlObjAndFakeGet
	 *
	 * @access public
	 * @return array
	 */
	public function getUrlObj()
	{
		if (!$this->url) {

		    /**
		     * We can't just use PATH_INFO unfortunately as it has url entities
		     * decoded. We must use REQUEST_URI that keeps url encoding and
		     * figure out a new, fake PATH_INFO that does contain url encoded characters.
		     **/
		    $reqUri = $this->getRequestUri();
		    if (0 === strpos(
		        $reqUri,
		        $scriptName = $this->getEnv('SCRIPT_NAME'))
		    ) {
		        $strlen = strlen($scriptName);
		        $pathInfoWithGet = substr($reqUri, $strlen);
		        $parts = explode('?', $pathInfoWithGet, 2);
		        # PATH_INFO, but keeping the URL encoded stuff!
		        $pathInfo = $parts[0];
		        $qs = isset($parts[1]) ? $parts[1] : null;
		    } else if ($redUrl = $this->getEnv('REDIRECT_URL')) {
		        $parts = explode('?', $reqUri, 2);
		        $reqUriWithoutQuery = $parts[0];
		        $qs = isset($parts[1]) ? $parts[1] : null;

		        $reqUriPathParts = explode('/', $reqUriWithoutQuery);

		        $realPathInfo = $this->getPathInfo();
		        $realPathInfoPathParts = explode('/', $realPathInfo);

		        # redirect url parts
		        $redUrlPathParts = explode('/', $redUrl);

		        $rebuildPathInfoParts = array();

		        while (
		            $realPathInfoPathParts &&
		            end($realPathInfoPathParts) === end($redUrlPathParts)
		        ) {
		            array_pop($realPathInfoPathParts);
		            array_pop($redUrlPathParts);

		            // now take the part off the REQUEST_URI parts as it still has
		            // the url encoding entact.
		            $part = array_pop($reqUriPathParts);

		            array_unshift($rebuildPathInfoParts, $part);
		        }

		        $pathInfo = sprintf(
		            '%s/%s',
		            join('/', $realPathInfoPathParts),
		            join('/', $rebuildPathInfoParts)
		        );
		    } else {
		        var_dump($reqUri, $scriptName, $this->server);
		        throw new LogicException("Cannot determine path info");
		    }

		    /**
		     * so /path/to/proxy.php/fakeGetParam=fakeGetVal&scheme=http/true-url.com/d/e/index.php?lol
		     * turns into true-url.com/d/e/index.php
		     * part 0: fakeGetParam=fakeGetVal&scheme=http
		     * part 1: true-url.com/d/e/index.php?lol
		     **/
		    $parts = explode('/', ltrim($pathInfo, '/'), 2);
		    parse_str($parts[0], $fakeGet);

		    $reqUri = $this->getEnv('REQUEST_URI');
		    $urlWithoutProtocol = $parts[1];
		    if (false !== strpos($reqUri, '?')) {
		        $urlWithoutProtocol .= '?' . $this->getEnv('QUERY_STRING');
		    }

		    $scheme = isset($fakeGet['scheme']) ? $fakeGet['scheme'] : 'http';
		    $url = sprintf("%s://%s", $scheme, $urlWithoutProtocol);
		    $url = new Amcsi_HttpProxy_Url($url, $fakeGet);
		    $this->url = $url;
		}
		return $this->url;
	}


	public function isApacheRewriteStyle()
	{
		return !!$this->getEnv('REDIRECT_URL');
	}


	/**
	 * Should be used only for non-apache-rewrite-style.
	 *
	 * @access public
	 * @return void
	 */
	public function getBaseUrl()
	{
		$scheme = $this->getScheme();

		$scriptName = $this->getScriptName();

		$sourceBaseUrl = sprintf(
		    "%s://%s%s",
		    $scheme,
		    $this->getHostOrIp(),
		    $scriptName
		);
		return $sourceBaseUrl;
	}


	/**
	 * Should be used only for non-apache-rewrite-style.
	 *
	 * @access public
	 * @return void
	 */
	public function getScriptName()
	{
		$scriptName = $this->getEnv('SCRIPT_NAME');
		if (!$scriptName) {
		    $reqUri = $this->getRequestUri();
		    list($reqUriWithoutQuery) = explode('?', $reqUri, 2);
		    $pathInfo = $this->getPathInfo();
		    $useReqUri = $reqUriWithoutQuery;

		    // subtract the pathinfo part from the request uri (without query)
		    // to get the script name.
		    $scriptName = str_replace($pathInfo, '', $useReqUri, $count);
		}
		return $scriptName;
	}


	public function getRequestUri()
	{
		if (!$this->requestUri) {
		    $server = $this->server;
		    $this->requestUri = isset($server['REQUEST_URI']) ?
		        $server['REQUEST_URI'] :
		        null
		    ;
		}
		return $this->requestUri;
	}


	public function getHostOrIp()
	{
		if (!$this->hostOrIp) {
		    $server = $this->server;
		    $this->hostOrIp = isset($server['HTTP_HOST']) ?
		        $server['HTTP_HOST'] :
		        null
		    ;
		    if (!$this->hostOrIp) {
		        $this->hostOrIp = isset($server['SERVER_ADDR']) ?
		            $server['SERVER_ADDR'] :
		            null
		        ;
		    }
		}
		return $this->hostOrIp;
	}


	public function getInput()
	{
		return $this->input;
	}


	public function getRequestHeaders()
	{
		return $this->requestHeaders;
	}


	public function getEnv($name)
	{
		return isset($this->server[$name]) ? $this->server[$name] : null;
	}


	public function isHttps()
	{
		return 'on' == $this->getEnv('HTTPS') ||
		    'true' == $this->getEnv('HTTP_SSL_CONNECTION');
	}


	public function getScheme()
	{
		return $this->isHttps() ? 'https' : 'http';
	}
}
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