/*
 * This file is a part of Winix
 * and is distributed under the 2-Clause BSD licence.
 * Author: Tomasz Sowa <t.sowa@ttmath.org>
 */

/* 
 * Copyright (c) 2008-2021, Tomasz Sowa
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
 
#ifndef headerfile_winix_core_request
#define headerfile_winix_core_request

#include <fcgiapp.h>
#include <sstream>
#include <vector>
#include "requesttypes.h"
#include "models/item.h"
#include "error.h"
#include "config.h"
#include "textstream.h"
#include "templates/htmltextstream.h"
#include "date/date.h"
#include "space/space.h"
#include "textstream/textstream.h"
#include "outstreams.h"
#include "models.h"
#include "models/winixmodel.h"
#include "header.h"


namespace Winix
{




class FunctionBase;




class Request : public WinixModel
{
public:


	// how many input headers can be put to in_headers struct
	static const size_t MAX_INPUT_HEADERS = 32;

	// how many characters there can be in one header name
	static const size_t INPUT_HEADER_NAME_MAX_LENGTH = 64;

	// how many characters there can be in one header value
	static const size_t INPUT_HEADER_VALUE_MAX_LENGTH = 8192;


	/*
		request id
		is incremented for each request and is never 0
		(from -1 will be incremented to one)
		it's used for some optimizations e.g. in templates
	*/
	size_t id;


	/*
	 * request start time
	 *
	 * start_time is the same as timespec_req_start.tv_sec
	 * start_date is a pt::Date converted from start_time
	 *
	 */
	timespec timespec_req_start;
	time_t   start_time;
	pt::Date start_date;


	/*
	 * request stop time
	 *
	 */
	timespec timespec_req_stop;


	/*
	 * request stop time - start time
	 *
	 */
	timespec timespec_req_diff;


	/*
	 * start time of the ezc engine (html templates)
	 *
	 */
	timespec timespec_ezc_engine_start;


	/*
	 * end time of the ezc engine (html templates)
	 *
	 */
	timespec timespec_ezc_engine_stop;






	/*
	 *
	 *
	 *
	 * variables representing input from client's browser
	 *
	 *
	 *
	*/

	/*
		the HTTP method
		!! IMPROVE ME add the rest methods here
	*/
	enum Method { get, post, head, delete_, unknown_method } method;


	/*
		subdomain
		subdomain = HTTP_HOST environment variable - config->base_url
	*/
	std::wstring subdomain;


	/*
		raw parameters
		!! CHECK ME may post_tab and cookie_tab should be changed to pt::Space now?
		or may change the name to cookie_in? or in_cookie?
	*/
	PostTab     post_tab;
	PostFileTab post_file_tab;
	CookieTab   cookie_tab;
	pt::Space	post_in;
	bool 		is_postin_used;// temporarily, before all post variables will be put to post_in

	// input headers (without cookies)
	// at the moment we are using FastCGI and HTTP headers are prefixed with 'HTTP_' string
	// so we drop the prefix and change all characters to small ones

	// although https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2 says that there can be more
	// than one http header with the same name we do not support it
	// each header has a different name here, cookies we have in a different container (cookie_tab)
	pt::Space headers_in;


	/*
		html anchor (those part of URI after '#' character)
	*/
	std::wstring anchor;


	// environment variables
	std::wstring env_request_method;
	std::wstring env_request_uri;
	std::wstring env_http_cookie;
	std::wstring env_http_host;
	std::wstring env_http_user_agent;
	std::wstring env_http_accept_encoding;
	std::wstring env_http_accept;
	std::wstring env_http_accept_language;
	std::wstring env_fcgi_role;
	std::wstring env_content_type;
	std::wstring env_https;

	// current IP address of the remote host
	// (read either from REMOTE_ADDR environment variable or from config.proxy_ip_header HTTP variable if config.check_proxy_ip_header is set to true)
	// (at the moment only IPv4 are supported)
	int ip;
	std::wstring ip_str; // ip_str can be ipv6 now


	// true if the browser is Microsoft Internet Explorer
	bool browser_msie;

    // true if the browser is Konqueror
    bool browser_konqueror;

	// true if we are using an encrypted connection (SSL)
	bool using_ssl;

	// true if the request is being made by ajax by htmx library
	bool is_htmx_request;

	/*
		request input variables representing the winix filesystem
	*/

	// current directory
	std::vector<Item*> dir_tab;

	// true if a file exists
	bool is_item;

	// current file (valid if is_item is true)
	Item item;

	// current winix function
	// null if there is no a function
	FunctionBase * function;

	// parameters (name:value)
	ParamTab param_tab;

	// this is a pointer either to the item (if exists) or to the last directory
	Item * last_item;




	/*
	 *
	 *
	 *
	 * variables for generating output to the client's browser
	 *
	 *
	 *
	*/

	//
	// the algorithm how a request's container is selected is shown below:
	// (the whole answer's algorightm is implemented in PrepareAnswerType() method)
	// ------------------------------------------------------------------------------------------
	//
	// at the beginning we set container_type to "raw" meaning simple text or html, then
	// we check the "Accept" http header, if it is set then we set container_type accordingly:
	//
	//     	                Accept | container_type
	//     	-----------------------------------------------
	//     	             text/html | container_raw
	//     	 application/xhtml+xml | container_raw
	//     	      application/json | container_json
	//     	       application/xml | container_xml
	//     	              text/csv | container_csv
	//
	// next we check "container" url parameter, if it is set then we set container_type accordingly
	// ("container" url parameter has higher precedence than "Accept" http header):
	//
	//                   container | container_type
	//      -----------------------------------------------
	//                        raw | container_raw
	//                       json | container_json
	//                        xml | container_xml
	//                        csv | container_csv
	//
	//
	// Samples:
	//
	// http://domain.tld/dir/controller
	// returns html answer from the main ezc stream
	//
	// http://domain.tld/dir/controller/container:raw
	// returns html answer from the main ezc stream (the same as above)
	//
	// http://domain.tld/dir/controller/frame:abc
	// returns "abc" frame as html
	//
	// http://domain.tld/dir/controller/container:json
	// returns all serialized models to json and no ezc streams
	//
	// http://domain.tld/dir/controller/container:xml
	// returns all serialized models to xml and no ezc streams
	//
	// http://domain.tld/dir/controller/container:json/frame:abc,xyz
	// returns all serialized models to json and two frames in 'ezc_frames' object
	//
	// http://domain.tld/dir/controller/container:json/all_frames
	// returns all serialized models to json and all frames in 'ezc_frames' object
	//
	// http://domain.tld/dir/controller/container:json/main_stream
	// returns all serialized models and the main ezc stream in 'main_stream' field
	//
	// http://domain.tld/dir/controller/container:json/main_stream/all_frames
	// returns all serialized models to json, all frames and the main stream
	//


	bool send_bin_stream;
	bool send_main_stream;
	bool send_all_frames;
	std::vector<std::wstring> send_frames;

	bool use_ezc_engine;
	bool serialize_models;


	// change maybe answer_text -> container_text?
	enum ContainerType
	{
		container_raw,
		container_json,
		container_xml,
		container_csv,
	};

	ContainerType container_type;


	// at the beginning those with higher priority
	std::vector<HeaderValue> accept_mime_types;

	// at the beginning those with higher priority
	std::vector<HeaderValue> accept_languages;

	// request status
	// !! CHANGE ME it'll be better to use ordinary http result codes
	Error status;

	// if not empty means an address for redirecting to
	// it should be url-encoded
	std::wstring redirect_to;

	// a redirect type
	// following redirect types are supported:
	// 300 Multiple Choices
	// 301 Moved Permanently
	// 302 Found
	// 303 See Other (default)
	// 307 Temporary Redirect
	int redirect_type;

	// send header X-LIGHTTPD-send-file with path to a file
	std::wstring x_sendfile;

	// send as attachment (causes generating header: content-disposition: attachment)
	bool send_as_attachment;

	// headers send to the client (without cookies) (may change to headers_out?)
	pt::Space out_headers;

	// cookies send to the client
	// a value can be either a cookie value or the whole cookie string (with domain, date etc)
	pt::Space out_cookies;


	// binary page sent to the client if answer_source is answer_bin_stream
	BinaryPage out_bin_stream;

	// main text output stream where the html otput is generated from ezc templates
	// here the whole html page (with doctype, head, body) is generated
	HtmlTextStream out_main_stream;

	// text output streams used in ajax requests
	// in ezc templates you can use [ezc frame "stream_name"] or just [frame "stream_name"] keyword
	// to switch between streams
	Ezc::OutStreams<HtmlTextStream, true> out_streams;

	// models to return or to render through ezc library
	Ezc::Models models;

	// filter html content with HTMLFilter, default the same as config.html_filter
	bool use_html_filter;
	
	// if this variable is true then winix always return 200 OK header
	// when the status would be 404 (not found) or 403 (permission denied)
	// default: false
	bool use_200_status_for_not_found_and_permission_denied;

	// options used by ezc generators
	bool gen_trim_white;
	bool gen_skip_new_line;
	bool gen_use_special_chars;

	// index template name
	std::wstring html_template;


	/*
		additional variables used for common uses
	*/

	// DEPRECATED will be removed
	// usually items in the current directory (depends on the function)
	std::vector<Item> item_tab;










	Request();
	void SetConfig(Config * pconfig);


	void fields();


	void RequestStarts();
	void RequestEnds();
	void Clear();

	void PrepareAnswerType();

	bool IsParam(const wchar_t * param_name);
	bool IsParam(const std::wstring & param_name);
	const std::wstring & ParamValue(const wchar_t * param_name);      // returns an empty string if there is no such a parameter
	const std::wstring & ParamValue(const std::wstring & param_name); // returns an empty string if there is no such a parameter

	std::wstring * ParamValuep(const wchar_t * param_name);           // returns nullptr if there is no such a parameter
	std::wstring * ParamValuep(const std::wstring & param_name);      // returns nullptr if there is no such a parameter

	bool IsPostVar(const wchar_t * var);
	bool IsPostVar(const std::wstring & var);
	const std::wstring & PostVar(const wchar_t * var);				// returns an empty string if there is no such a parameter
	const std::wstring & PostVar(const std::wstring & var);			// returns an empty string if there is no such a parameter
	bool PostVar(const wchar_t * var, std::wstring & result);
	bool PostVar(const std::wstring & var, std::wstring & result);
	std::wstring * PostVarp(const wchar_t * var);
	std::wstring * PostVarp(const std::wstring & var);

	bool AllPostVarEmpty(); // returning true if all post vars are empty


	// setting a cookie
	// name  - cookie name (either const wchar_t, or std::wstring or pt::WTextStream)
	// value - cookie value (can be everything which can be put to pt::WTextStream stream)
	// the return std::wstring reference is a reference to the cookie inserted value (in out_cookies structure)
	template<typename NameType, typename ValueType>
	void AddCookie(const NameType & name, const ValueType & value, pt::Date * expires = 0);

	template<typename NameType, typename ValueType>
	void AddCookie(const NameType & name, const ValueType & value, pt::Date & expires);

	bool has_frame(const wchar_t * frame);
	bool has_frame(const std::wstring & frame);


private:

	Config * config;

	// used in ParamValue() and PostVar() when there is no such a param
	const std::wstring str_empty;

	void ClearOutputStreams();

	void CheckAcceptHeader();
	void CheckContainerParameter();
	void PrepareFrameNames();

	void current_dir(morm::Wrapper & wrapper);
	void last_item_wrapper(morm::Wrapper & wrapper);


	MORM_MEMBER_FIELD(Request)

};




template<typename NameType, typename ValueType>
void Request::AddCookie(const NameType & name, const ValueType & value, pt::Date * expires)
{
	pt::WTextStream cookie;

	cookie << value;

	if( cookie.empty() )
		cookie << L"\"\""; // cookie empty value

	if( expires )
		cookie << L"; expires=" << DateToStrCookie(*expires) << L" GMT";

	cookie << L"; path=/; domain=" << config->base_url;

	/*
		!! IMPROVE ME add an option to the config

		don't use '; secure' flag if you are using both sites (with SSL
		and without SSL) -- with secure flag the cookie is sent only through
		SSL and if you accidentally open a new window without SSL (http://)
		then winix will create a new session for you and the previous session (https://)
		will be lost (the session cookie will be overwritten in the client's browser)
	*/

	out_cookies.add_stream(name, cookie);
}


template<typename NameType, typename ValueType>
void Request::AddCookie(const NameType & name, const ValueType & value, pt::Date & expires)
{
	AddCookie(name, value, &expires);
}






} // namespace Winix

#endif