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/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#ifndef _SDLname_h_
#define _SDLname_h_

#if defined(__STDC__) || defined(__cplusplus)
#define NeedFunctionPrototypes 1
#endif

#define SDL_NAME(X) SDL_##X

#endif /* _SDLname_h_ */

/* vi: set ts=4 sw=4 expandtab: */
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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************

http.cpp

HTTP server handling

***************************************************************************/

#include "emu.h"
#include "server_ws_impl.hpp"
#include "server_http_impl.hpp"
#include <fstream>

#include <inttypes.h>
#include <stdint.h>


const static struct mapping
{
	const char* extension;
	const char* mime_type;
} mappings[] =
{
	{ "aac",     "audio/aac" },
	{ "aat",     "application/font-sfnt" },
	{ "aif",     "audio/x-aif" },
	{ "arj",     "application/x-arj-compressed" },
	{ "asf",     "video/x-ms-asf" },
	{ "avi",     "video/x-msvideo" },
	{ "bmp",     "image/bmp" },
	{ "cff",     "application/font-sfnt" },
	{ "css",     "text/css" },
	{ "csv",     "text/csv" },
	{ "doc",     "application/msword" },
	{ "eps",     "application/postscript" },
	{ "exe",     "application/octet-stream" },
	{ "gif",     "image/gif" },
	{ "gz",      "application/x-gunzip" },
	{ "htm",     "text/html" },
	{ "html",    "text/html" },
	{ "ico",     "image/x-icon" },
	{ "ief",     "image/ief" },
	{ "jpeg",    "image/jpeg" },
	{ "jpg",     "image/jpeg" },
	{ "jpm",     "image/jpm" },
	{ "jpx",     "image/jpx" },
	{ "js",      "application/javascript" },
	{ "json",    "application/json" },
	{ "lay",     "text/xml" },
	{ "m3u",     "audio/x-mpegurl" },
	{ "m4v",     "video/x-m4v" },
	{ "mid",     "audio/x-midi" },
	{ "mov",     "video/quicktime" },
	{ "mp3",     "audio/mpeg" },
	{ "mp4",     "video/mp4" },
	{ "mpeg",    "video/mpeg" },
	{ "mpg",     "video/mpeg" },
	{ "oga",     "audio/ogg" },
	{ "ogg",     "audio/ogg" },
	{ "ogv",     "video/ogg" },
	{ "otf",     "application/font-sfnt" },
	{ "pct",     "image/x-pct" },
	{ "pdf",     "application/pdf" },
	{ "pfr",     "application/font-tdpfr" },
	{ "pict",    "image/pict" },
	{ "png",     "image/png" },
	{ "ppt",     "application/x-mspowerpoint" },
	{ "ps",      "application/postscript" },
	{ "qt",      "video/quicktime" },
	{ "ra",      "audio/x-pn-realaudio" },
	{ "ram",     "audio/x-pn-realaudio" },
	{ "rar",     "application/x-arj-compressed" },
	{ "rgb",     "image/x-rgb" },
	{ "rtf",     "application/rtf" },
	{ "sgm",     "text/sgml" },
	{ "shtm",    "text/html" },
	{ "shtml",   "text/html" },
	{ "sil",     "application/font-sfnt" },
	{ "svg",     "image/svg+xml" },
	{ "swf",     "application/x-shockwave-flash" },
	{ "tar",     "application/x-tar" },
	{ "tgz",     "application/x-tar-gz" },
	{ "tif",     "image/tiff" },
	{ "tiff",    "image/tiff" },
	{ "torrent", "application/x-bittorrent" },
	{ "ttf",     "application/font-sfnt" },
	{ "txt",     "text/plain" },
	{ "wav",     "audio/x-wav" },
	{ "webm",    "video/webm" },
	{ "woff",    "application/font-woff" },
	{ "wrl",     "model/vrml" },
	{ "xhtml",   "application/xhtml+xml" },
	{ "xls",     "application/x-msexcel" },
	{ "xml",     "text/xml" },
	{ "xsl",     "application/xml" },
	{ "xslt",    "application/xml" },
	{ "zip",     "application/x-zip-compressed" }
};

static std::string extension_to_type(const std::string& extension)
{
	for (mapping m : mappings)
	{
		if (m.extension == extension)
		{
			return m.mime_type;
		}
	}

	return "text/plain";
}

/** An HTTP Request. */
struct http_request_impl : public http_manager::http_request
{
public:
	std::shared_ptr<webpp::Request> m_request;
	std::size_t m_query;
	std::size_t m_fragment;
	std::size_t m_path_end;
	std::size_t m_query_end;

	http_request_impl(std::shared_ptr<webpp::Request> request) : m_request(request) {
		std::size_t len = m_request->path.length();

		m_fragment = m_request->path.find('#');
		m_query_end = m_fragment == std::string::npos ? len : m_fragment;

		m_query = m_request->path.find('?');
		m_path_end = m_query == std::string::npos ? m_query_end : m_query;
	}

	virtual ~http_request_impl() = default;

	/** Retrieves the requested resource. */
	virtual const std::string get_resource() {
		// The entire resource: path, query and fragment.
		return m_request->path;
	}

	/** Returns the path part of the requested resource. */
	virtual const std::string get_path() {
		return m_request->path.substr(0, m_path_end);
	}

	/** Returns the query part of the requested resource. */
	virtual const std::string get_query() {
		return m_query == std::string::npos ? "" : m_request->path.substr(m_query, m_query_end);
	}

	/** Returns the fragment part of the requested resource. */
	virtual const std::string get_fragment() {
		return m_fragment == std::string::npos ? "" : m_request->path.substr(m_fragment);
	}

	/** Retrieves a header from the HTTP request. */
	virtual const std::string get_header(const std::string &header_name) {
		auto i = m_request->header.find(header_name);
		if (i != m_request->header.end()) {
			return (*i).second;
		} else {
			return "";
		}
	}

	/** Retrieves a header from the HTTP request. */
	virtual const std::list<std::string> get_headers(const std::string &header_name) {
		std::list<std::string> result;
		auto range = m_request->header.equal_range(header_name);
		for (auto i = range.first; i != range.second; i++) {
			result.push_back((*i).second);
		}
		return result;
	}

	/** Returns the body that was submitted with the HTTP request. */
	virtual const std::string get_body() {
		// TODO(cbrunschen): What to return here - http_server::Request has a 'content' feld that is never filled in!
		return "";
	}
};

/** An HTTP response. */
struct http_response_impl : public http_manager::http_response {
	std::shared_ptr<webpp::Response> m_response;
	int m_status;
	std::string m_content_type;
	std::stringstream m_headers;
	std::stringstream m_body;

	http_response_impl(std::shared_ptr<webpp::Response> response) : m_response(response) { }

	virtual ~http_response_impl() = default;

	/** Sets the HTTP status to be returned to the client. */
	virtual void set_status(int status) {
		m_status = status;
	}

	/** Sets the HTTP content type to be returned to the client. */
	virtual void set_content_type(const std::string &content_type) {
		m_content_type = content_type;
	}

	/** Sets the body to be sent to the client. */
	virtual void set_body(const std::string &body) {
		m_body.str("");
		append_body(body);
	}

	/** Appends something to the body to be sent to the client. */
	virtual void append_body(const std::string &body) {
		m_body << body;
	}

	/** Sends the response to the client. */
	void send() {
		m_response->type(m_content_type);
		m_response->status(m_status);
		m_response->send(m_body.str());
	}
};

struct websocket_endpoint_impl : public http_manager::websocket_endpoint {
	/** The underlying edpoint. */
	webpp::ws_server::Endpoint *m_endpoint;

	websocket_endpoint_impl(webpp::ws_server::Endpoint *endpoint,
		http_manager::websocket_open_handler on_open,
		http_manager::websocket_message_handler on_message,
		http_manager::websocket_close_handler on_close,
		http_manager::websocket_error_handler on_error)
	: m_endpoint(endpoint) {
		this->on_open = on_open;
		this->on_message = on_message;
		this->on_close = on_close;
		this->on_error = on_error;
	}
};

struct websocket_connection_impl : public http_manager::websocket_connection {
	/** The server */
	webpp::ws_server *m_wsserver;
	/* The underlying Commection. */
	std::weak_ptr<webpp::Connection> m_connection;
	websocket_connection_impl(webpp::ws_server *server, std::shared_ptr<webpp::Connection> connection)
		: m_wsserver(server), m_connection(connection) { }

	/** Sends a message to the client that is connected on the other end of this Websocket connection. */
	virtual void send_message(const std::string &payload, int opcode) {
		if (auto connection = m_connection.lock()) {
			std::shared_ptr<webpp::ws_server::SendStream> message_stream = std::make_shared<webpp::ws_server::SendStream>();
			(*message_stream) << payload;
			m_wsserver->send(connection, message_stream, nullptr, opcode | 0x80);
		}
	}

	/** Closes this open Websocket connection. */
	virtual void close() {
		if (auto connection = m_connection.lock()) {
			m_wsserver->send_close(connection, 1000 /* normal close */);
		}
	}
};

http_manager::http_manager(bool active, short port, const char *root)
  : m_active(active), m_io_context(std::make_shared<asio::io_context>()), m_root(root)
{
	if (!active) return;

	m_server = std::make_unique<webpp::http_server>();
	m_server->m_config.port = port;
	m_server->set_io_context(m_io_context);
	m_wsserver = std::make_unique<webpp::ws_server>();

	auto& endpoint = m_wsserver->m_endpoint["/"];

	m_server->on_get([root](auto response, auto request) {
		std::string doc_root = root;

		auto request_impl = std::make_shared<http_request_impl>(request);

		std::string path = request_impl->get_path();
		// If path ends in slash (i.e. is a directory) then add "index.html".
		if (path[path.size() - 1] == '/')
		{
			path += "index.html";
		}

		// Determine the file extension.
		std::size_t last_slash_pos = path.find_last_of("/");
		std::size_t last_dot_pos = path.find_last_of(".");
		std::string extension;
		if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos)
		{
			extension = path.substr(last_dot_pos + 1);
		}

		// Open the file to send back.
		std::string full_path = doc_root + path;
		std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary);
		if (!is)
		{
			response->status(400).send("Error");
		}
		else
		{
			// Fill out the reply to be sent to the client.
			std::string content;
			char buf[512];
			while (is.read(buf, sizeof(buf)).gcount() > 0)
				content.append(buf, size_t(is.gcount()));

			response->type(extension_to_type(extension));
			response->status(200).send(content);
		}
	});

	endpoint.on_open = [&](auto connection) {
		auto send_stream = std::make_shared<webpp::ws_server::SendStream>();
		*send_stream << "update_machine";
		m_wsserver->send(connection, send_stream);
	};

	m_server->on_upgrade = [this](auto socket, auto request) {
		auto connection = std::make_shared<webpp::ws_server::Connection>(socket);
		connection->method = std::move(request->method);
		connection->path = std::move(request->path);
		connection->http_version = std::move(request->http_version);
		connection->header = std::move(request->header);
		connection->remote_endpoint_address = std::move(request->remote_endpoint_address);
		connection->remote_endpoint_port = request->remote_endpoint_port;
		m_wsserver->upgrade(connection);
	};

	m_server->start();

	m_server_thread = std::thread([this]() {
		m_io_context->run();
	});
}

http_manager::~http_manager()
{
	if (!m_server) return;

	m_server->stop();
	m_io_context->stop();
	if (m_server_thread.joinable())
		m_server_thread.join();
}

static void on_get(http_manager::http_handler handler, std::shared_ptr<webpp::Response> response, std::shared_ptr<webpp::Request> request) {
	auto request_impl = std::make_shared<http_request_impl>(request);
	auto response_impl = std::make_shared<http_response_impl>(response);

	handler(request_impl, response_impl);

	response_impl->send();
}

void http_manager::on_open(http_manager::websocket_endpoint_ptr endpoint, std::shared_ptr<webpp::Connection> connection) {
	std::lock_guard<std::mutex> lock(m_connections_mutex);
	webpp::ws_server *ws_server = m_wsserver.get();

	http_manager::websocket_connection_ptr connection_impl = std::make_shared<websocket_connection_impl>(ws_server, connection);
	m_connections[connection.get()] = connection_impl;

	if (endpoint->on_open) {
		endpoint->on_open(connection_impl);
	}
}

void http_manager::on_message(http_manager::websocket_endpoint_ptr endpoint, std::shared_ptr<webpp::Connection> connection, const std::string &payload, int opcode) {
	if (endpoint->on_message) {
		std::lock_guard<std::mutex> lock(m_connections_mutex);
		auto i = m_connections.find(connection.get());
		if (i != m_connections.end()) {
			http_manager::websocket_connection_ptr websocket_connection_impl = (*i).second;
			endpoint->on_message(websocket_connection_impl, payload, opcode);
		}
	}
}

void http_manager::on_close(http_manager::websocket_endpoint_ptr endpoint, std::shared_ptr<webpp::Connection> connection,
			  int status, const std::string& reason) {
	std::lock_guard<std::mutex> lock(m_connections_mutex);
	auto i = m_connections.find(connection.get());
	if (i != m_connections.end()) {
		if (endpoint->on_close) {
			http_manager::websocket_connection_ptr websocket_connection_impl = (*i).second;
			endpoint->on_close(websocket_connection_impl, status, reason);
		}

		m_connections.erase(connection.get());
	}
}

void http_manager::on_error(http_manager::websocket_endpoint_ptr endpoint, std::shared_ptr<webpp::Connection> connection,
			  const std::error_code& error_code) {
	std::lock_guard<std::mutex> lock(m_connections_mutex);
	auto i = m_connections.find(connection.get());
	if (i != m_connections.end()) {
		if (endpoint->on_error) {
			http_manager::websocket_connection_ptr websocket_connection_impl = (*i).second;
			endpoint->on_error(websocket_connection_impl, error_code);
		}

		m_connections.erase(connection.get());
	}
}

bool http_manager::read_file(std::ostream &os, const std::string &path) {
	std::ostringstream full_path;
	full_path << m_root << path;
	util::core_file::ptr f;
	osd_file::error e = util::core_file::open(full_path.str(), OPEN_FLAG_READ, f);
	if (e == osd_file::error::NONE)
	{
		int c;
		while ((c = f->getc()) >= 0)
		{
			os.put(c);
		}
	}
	return e == osd_file::error::NONE;
}

void http_manager::serve_document(http_request_ptr request, http_response_ptr response, const std::string &filename) {
	if (!m_active) return;

	std::ostringstream os;
	if (read_file(os, filename))
	{
		response->set_status(200);
		response->set_body(os.str());
	}
	else
	{
		response->set_status(500);
	}
}

void http_manager::serve_template(http_request_ptr request, http_response_ptr response,
								  const std::string &filename, substitution substitute, char init, char term)
{
	if (!m_active) return;

	// printf("webserver: serving template '%s' at path '%s'\n", filename.c_str(), request->get_path().c_str());
	std::stringstream ss;
	if (read_file(ss, filename))
	{
		std::ostringstream os;
		while (ss.good())
		{
			std::string s;
			getline(ss, s, init);
			os << s;
			if (ss.good())
			{
				// printf("webserver: found initiator '%c'\n", init);
				getline(ss, s, term);
				if (ss.good())
				{
					if (substitute(s))
					{
						os << s;
					}
					else
					{
						os << init << s << term;
					}
				}
				else
				{
					// printf("webserver: reached end before terminator\n");
					os << init;
					os << s;
				}
			}
			else
			{
				// printf("webserver: reached end before initiator\n");
			}
		}

		response->set_status(200);
		response->set_body(os.str());
	}
	else
	{
		response->set_status(500);
	}
}

void http_manager::add_http_handler(const std::string &path, http_manager::http_handler handler)
{
	if (!m_active) return;

	using namespace std::placeholders;
	m_server->on_get(path, std::bind(on_get, handler, _1, _2));

	std::lock_guard<std::mutex> lock(m_handlers_mutex);
	m_handlers.emplace(path, handler);
}

void http_manager::remove_http_handler(const std::string &path) {
	if (!m_active) return;

	m_server->remove_handler(path);

	std::lock_guard<std::mutex> lock(m_handlers_mutex);
	m_handlers.erase(path);
}

void http_manager::clear() {
	if (!m_active) return;

	m_server->clear();

	std::lock_guard<std::mutex> lock(m_handlers_mutex);
	m_handlers.clear();
}

http_manager::websocket_endpoint_ptr http_manager::add_endpoint(const std::string &path,
		http_manager::websocket_open_handler on_open,
		http_manager::websocket_message_handler on_message,
		http_manager::websocket_close_handler on_close,
		http_manager::websocket_error_handler on_error)  {
	if (!m_active) return std::shared_ptr<websocket_endpoint_impl>(nullptr);

	auto i = m_endpoints.find(path);
	if (i == m_endpoints.end()) {
		using namespace std::placeholders;

		auto &endpoint = m_wsserver->m_endpoint[path];
		webpp::ws_server::Endpoint *endpoint_ptr(&endpoint);
		auto endpoint_impl = std::make_shared<websocket_endpoint_impl>(endpoint_ptr, on_open, on_message, on_close, on_error);

		endpoint.on_open = [&, this, endpoint_impl](std::shared_ptr<webpp::Connection> connection) {
			this->on_open(endpoint_impl, connection);
		};

		endpoint.on_message = [&, this, endpoint_impl](std::shared_ptr<webpp::Connection> connection, std::shared_ptr<webpp::ws_server::Message> message) {
			std::string payload = message->string();
			int opcode = message->fin_rsv_opcode & 0x0f;
			this->on_message(endpoint_impl, connection, payload, opcode);
		};

		endpoint.on_close = [&, this, endpoint_impl](std::shared_ptr<webpp::Connection> connection, int status, const std::string& reason) {
			this->on_close(endpoint_impl, connection, status, reason);
		};

		endpoint.on_error = [&, this, endpoint_impl](std::shared_ptr<webpp::Connection> connection, const std::error_code& error_code) {
			this->on_error(endpoint_impl, connection, error_code);
		};

		m_endpoints[path] = endpoint_impl;
		return endpoint_impl;
	} else {
		return (*i).second;
	}
}

void http_manager::remove_endpoint(const std::string &path) {
	if (!m_active) return;

	m_endpoints.erase(path);
}