/*************************************************************************/
/*  http_client.h                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef HTTP_CLIENT_H
#define HTTP_CLIENT_H

#include "core/io/ip.h"
#include "core/io/stream_peer.h"
#include "core/io/stream_peer_tcp.h"
#include "core/reference.h"

class HTTPClient : public Reference {
	GDCLASS(HTTPClient, Reference);

public:
	enum ResponseCode {

		// 1xx informational
		RESPONSE_CONTINUE = 100,
		RESPONSE_SWITCHING_PROTOCOLS = 101,
		RESPONSE_PROCESSING = 102,

		// 2xx successful
		RESPONSE_OK = 200,
		RESPONSE_CREATED = 201,
		RESPONSE_ACCEPTED = 202,
		RESPONSE_NON_AUTHORITATIVE_INFORMATION = 203,
		RESPONSE_NO_CONTENT = 204,
		RESPONSE_RESET_CONTENT = 205,
		RESPONSE_PARTIAL_CONTENT = 206,
		RESPONSE_MULTI_STATUS = 207,
		RESPONSE_ALREADY_REPORTED = 208,
		RESPONSE_IM_USED = 226,

		// 3xx redirection
		RESPONSE_MULTIPLE_CHOICES = 300,
		RESPONSE_MOVED_PERMANENTLY = 301,
		RESPONSE_FOUND = 302,
		RESPONSE_SEE_OTHER = 303,
		RESPONSE_NOT_MODIFIED = 304,
		RESPONSE_USE_PROXY = 305,
		RESPONSE_SWITCH_PROXY = 306,
		RESPONSE_TEMPORARY_REDIRECT = 307,
		RESPONSE_PERMANENT_REDIRECT = 308,

		// 4xx client error
		RESPONSE_BAD_REQUEST = 400,
		RESPONSE_UNAUTHORIZED = 401,
		RESPONSE_PAYMENT_REQUIRED = 402,
		RESPONSE_FORBIDDEN = 403,
		RESPONSE_NOT_FOUND = 404,
		RESPONSE_METHOD_NOT_ALLOWED = 405,
		RESPONSE_NOT_ACCEPTABLE = 406,
		RESPONSE_PROXY_AUTHENTICATION_REQUIRED = 407,
		RESPONSE_REQUEST_TIMEOUT = 408,
		RESPONSE_CONFLICT = 409,
		RESPONSE_GONE = 410,
		RESPONSE_LENGTH_REQUIRED = 411,
		RESPONSE_PRECONDITION_FAILED = 412,
		RESPONSE_REQUEST_ENTITY_TOO_LARGE = 413,
		RESPONSE_REQUEST_URI_TOO_LONG = 414,
		RESPONSE_UNSUPPORTED_MEDIA_TYPE = 415,
		RESPONSE_REQUESTED_RANGE_NOT_SATISFIABLE = 416,
		RESPONSE_EXPECTATION_FAILED = 417,
		RESPONSE_IM_A_TEAPOT = 418,
		RESPONSE_MISDIRECTED_REQUEST = 421,
		RESPONSE_UNPROCESSABLE_ENTITY = 422,
		RESPONSE_LOCKED = 423,
		RESPONSE_FAILED_DEPENDENCY = 424,
		RESPONSE_UPGRADE_REQUIRED = 426,
		RESPONSE_PRECONDITION_REQUIRED = 428,
		RESPONSE_TOO_MANY_REQUESTS = 429,
		RESPONSE_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
		RESPONSE_UNAVAILABLE_FOR_LEGAL_REASONS = 451,

		// 5xx server error
		RESPONSE_INTERNAL_SERVER_ERROR = 500,
		RESPONSE_NOT_IMPLEMENTED = 501,
		RESPONSE_BAD_GATEWAY = 502,
		RESPONSE_SERVICE_UNAVAILABLE = 503,
		RESPONSE_GATEWAY_TIMEOUT = 504,
		RESPONSE_HTTP_VERSION_NOT_SUPPORTED = 505,
		RESPONSE_VARIANT_ALSO_NEGOTIATES = 506,
		RESPONSE_INSUFFICIENT_STORAGE = 507,
		RESPONSE_LOOP_DETECTED = 508,
		RESPONSE_NOT_EXTENDED = 510,
		RESPONSE_NETWORK_AUTH_REQUIRED = 511,

	};

	enum Method {

		METHOD_GET,
		METHOD_HEAD,
		METHOD_POST,
		METHOD_PUT,
		METHOD_DELETE,
		METHOD_OPTIONS,
		METHOD_TRACE,
		METHOD_CONNECT,
		METHOD_PATCH,
		METHOD_MAX

	};

	enum Status {

		STATUS_DISCONNECTED,
		STATUS_RESOLVING, // Resolving hostname (if passed a hostname)
		STATUS_CANT_RESOLVE,
		STATUS_CONNECTING, // Connecting to IP
		STATUS_CANT_CONNECT,
		STATUS_CONNECTED, // Connected, requests can be made
		STATUS_REQUESTING, // Request in progress
		STATUS_BODY, // Request resulted in body, which must be read
		STATUS_CONNECTION_ERROR,
		STATUS_SSL_HANDSHAKE_ERROR,

	};

private:
	static const char *_methods[METHOD_MAX];
	static const int HOST_MIN_LEN = 4;

	enum Port {

		PORT_HTTP = 80,
		PORT_HTTPS = 443,

	};

#ifndef JAVASCRIPT_ENABLED
	Status status;
	IP::ResolverID resolving;
	Array ip_candidates;
	int conn_port; // Server to make requests to.
	String conn_host;
	int server_port; // Server to connect to (might be a proxy server).
	String server_host;
	int http_proxy_port; // Proxy server for http requests.
	String http_proxy_host;
	int https_proxy_port; // Proxy server for https requests.
	String https_proxy_host;
	bool ssl;
	bool ssl_verify_host;
	bool blocking;
	bool handshaking;
	bool head_request;

	Vector<uint8_t> response_str;

	bool chunked;
	Vector<uint8_t> chunk;
	int chunk_left;
	bool chunk_trailer_part;
	int body_size;
	int body_left;
	bool read_until_eof;

	Ref<StreamPeerTCP> tcp_connection;
	Ref<StreamPeer> connection;
	Ref<HTTPClient> proxy_client;

	int response_num;
	Vector<String> response_headers;
	int read_chunk_size;

	Error _get_http_data(uint8_t *p_buffer, int p_bytes, int &r_received);

#else
#include "platform/javascript/http_client.h.inc"
#endif

	PoolStringArray _get_response_headers();
	Dictionary _get_response_headers_as_dictionary();

	static void _bind_methods();

public:
	Error connect_to_host(const String &p_host, int p_port = -1, bool p_ssl = false, bool p_verify_host = true);

	void set_connection(const Ref<StreamPeer> &p_connection);
	Ref<StreamPeer> get_connection() const;

	Error request_raw(Method p_method, const String &p_url, const Vector<String> &p_headers, const PoolVector<uint8_t> &p_body);
	Error request(Method p_method, const String &p_url, const Vector<String> &p_headers, const String &p_body = String());

	void close();

	Status get_status() const;

	bool has_response() const;
	bool is_response_chunked() const;
	int get_response_code() const;
	Error get_response_headers(List<String> *r_response);
	int get_response_body_length() const;

	PoolByteArray read_response_body_chunk(); // Can't get body as partial text because of most encodings UTF8, gzip, etc.

	void set_blocking_mode(bool p_enable); // Useful mostly if running in a thread
	bool is_blocking_mode_enabled() const;

	void set_read_chunk_size(int p_size);
	int get_read_chunk_size() const;

	Error poll();

	String query_string_from_dict(const Dictionary &p_dict);

	// Use empty string or -1 to unset.
	void set_http_proxy(const String &p_host, int p_port);
	void set_https_proxy(const String &p_host, int p_port);

	HTTPClient();
	~HTTPClient();
};

VARIANT_ENUM_CAST(HTTPClient::ResponseCode)
VARIANT_ENUM_CAST(HTTPClient::Method);
VARIANT_ENUM_CAST(HTTPClient::Status);

#endif // HTTP_CLIENT_H