<?php

namespace Composer\Util\Http;

use Composer\Downloader\TransportException;
use Composer\Util\NoProxyPattern;
use Composer\Util\Url;

/**
 * @internal
 * @author John Stevenson <john-stevenson@blueyonder.co.uk>
 */
class ProxyManager
{
	/** @var ?string */
	private $error = null;

	/** @var array{http: ?string, https: ?string} */
	private $fullProxy;

	/** @var array{http: ?string, https: ?string} */
	private $safeProxy;

	/** @var array{http: array{options: mixed[]|null}, https: array{options: mixed[]|null}} */
	private $streams;

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

	/** @var ?string */
	private $info = null;

	/** @var ?NoProxyPattern */
	private $noProxyHandler = null;

	/** @var ?ProxyManager */
	private static $instance = null;


	private function __construct()
	{
		$this->fullProxy = $this->safeProxy = [
		    'http' => null,
		    'https' => null,
		];

		$this->streams['http'] = $this->streams['https'] = [
		    'options' => null,
		];

		$this->hasProxy = false;
		$this->initProxyData();
	}


	public static function getInstance(): ProxyManager
	{
		if (!self::$instance) {
		    self::$instance = new self();
		}

		return self::$instance;
	}


	/**
	 * Clears the persistent instance
	 */
	public static function reset(): void
	{
		self::$instance = null;
	}


	/**
	 * Returns a RequestProxy instance for the request url
	 *
	 * @param non-empty-string $requestUrl
	 */
	public function getProxyForRequest(string $requestUrl): RequestProxy
	{
		if ($this->error) {
		    throw new TransportException('Unable to use a proxy: '.$this->error);
		}

		$scheme = parse_url($requestUrl, PHP_URL_SCHEME) ?: 'http';
		$proxyUrl = '';
		$options = [];
		$formattedProxyUrl = '';

		if ($this->hasProxy && in_array($scheme, ['http', 'https'], true) && $this->fullProxy[$scheme]) {
		    if ($this->noProxy($requestUrl)) {
		        $formattedProxyUrl = 'excluded by no_proxy';
		    } else {
		        $proxyUrl = $this->fullProxy[$scheme];
		        $options = $this->streams[$scheme]['options'];
		        ProxyHelper::setRequestFullUri($requestUrl, $options);
		        $formattedProxyUrl = $this->safeProxy[$scheme];
		    }
		}

		return new RequestProxy($proxyUrl, $options, $formattedProxyUrl);
	}


	/**
	 * Returns true if a proxy is being used
	 *
	 * @return bool If false any error will be in $message
	 */
	public function isProxying(): bool
	{
		return $this->hasProxy;
	}


	/**
	 * Returns proxy configuration info which can be shown to the user
	 *
	 * @return string|null Safe proxy URL or an error message if setting up proxy failed or null if no proxy was configured
	 */
	public function getFormattedProxy(): ?string
	{
		return $this->hasProxy ? $this->info : $this->error;
	}


	/**
	 * Initializes proxy values from the environment
	 */
	private function initProxyData(): void
	{
		try {
		    [$httpProxy, $httpsProxy, $noProxy] = ProxyHelper::getProxyData();
		} catch (\RuntimeException $e) {
		    $this->error = $e->getMessage();

		    return;
		}

		$info = [];

		if ($httpProxy) {
		    $info[] = $this->setData($httpProxy, 'http');
		}
		if ($httpsProxy) {
		    $info[] = $this->setData($httpsProxy, 'https');
		}
		if ($this->hasProxy) {
		    $this->info = implode(', ', $info);
		    if ($noProxy) {
		        $this->noProxyHandler = new NoProxyPattern($noProxy);
		    }
		}
	}


	/**
	 * Sets initial data
	 *
	 * @param non-empty-string $url    Proxy url
	 * @param 'http'|'https'   $scheme Environment variable scheme
	 *
	 * @return non-empty-string
	 */
	private function setData($url, $scheme): string
	{
		$safeProxy = Url::sanitize($url);
		$this->fullProxy[$scheme] = $url;
		$this->safeProxy[$scheme] = $safeProxy;
		$this->streams[$scheme]['options'] = ProxyHelper::getContextOptions($url);
		$this->hasProxy = true;

		return sprintf('%s=%s', $scheme, $safeProxy);
	}


	/**
	 * Returns true if a url matches no_proxy value
	 */
	private function noProxy(string $requestUrl): bool
	{
		return $this->noProxyHandler && $this->noProxyHandler->test($requestUrl);
	}
}
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