/*
Copyright (c) 2009-2013
	Lars-Dominik Braun <lars@6xq.net>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#ifndef SRC_LIBWAITRESS_WAITRESS_H_ZE5NT8JI
#define SRC_LIBWAITRESS_WAITRESS_H_ZE5NT8JI

#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <gnutls/gnutls.h>

#define WAITRESS_BUFFER_SIZE 10*1024

typedef enum {
	WAITRESS_METHOD_GET = 0,
	WAITRESS_METHOD_POST,
} WaitressMethod_t;

typedef enum {
	WAITRESS_CB_RET_ERR,
	WAITRESS_CB_RET_OK,
} WaitressCbReturn_t;

typedef enum {
	WAITRESS_HANDLER_CONTINUE,
	WAITRESS_HANDLER_DONE,
	WAITRESS_HANDLER_ERR,
	WAITRESS_HANDLER_ABORTED,
} WaitressHandlerReturn_t;

typedef struct {
	char *url; /* splitted url, unusable */
	bool tls;
	const char *user;
	const char *password;
	const char *host;
	const char *port;
	const char *tlsPort;
	const char *path; /* without leading '/' */
} WaitressUrl_t;

typedef enum {
	WAITRESS_RET_ERR = 0,
	WAITRESS_RET_OK,
	WAITRESS_RET_CB_ABORT,
	/* http error codes */
	WAITRESS_RET_STATUS_UNKNOWN,
	WAITRESS_RET_NOTFOUND,
	WAITRESS_RET_FORBIDDEN,
	WAITRESS_RET_BAD_REQUEST,
	/* socket errors */
	WAITRESS_RET_CONNECT_REFUSED,
	WAITRESS_RET_SOCK_ERR,
	WAITRESS_RET_GETADDR_ERR,
	WAITRESS_RET_TIMEOUT,
	WAITRESS_RET_READ_ERR,
	WAITRESS_RET_CONNECTION_CLOSED,
	WAITRESS_RET_TLS_WRITE_ERR,
	WAITRESS_RET_TLS_READ_ERR,
	/* protocol errors */
	WAITRESS_RET_PARTIAL_FILE,
	WAITRESS_RET_DECODING_ERR,
	WAITRESS_RET_TLS_HANDSHAKE_ERR,
	WAITRESS_RET_TLS_FINGERPRINT_MISMATCH,
} WaitressReturn_t;

/*	reusable handle
 */
typedef struct {
	int timeout;
	WaitressMethod_t method;

	const char *extraHeaders;
	const char *postData;
	/* extra data handed over to callback function */
	void *data;
	WaitressCbReturn_t (*callback) (void *, size_t, void *);
	const char *tlsFingerprint;

	WaitressUrl_t url;
	WaitressUrl_t proxy;

	gnutls_certificate_credentials_t tlsCred;

	/* per-request data */
	struct {
		int sockfd;

		/* temporary return value storage */
		WaitressReturn_t readWriteRet;

		size_t contentLength, contentReceived, chunkSize;
		bool contentLengthKnown;
		enum {CHUNKSIZE = 0, DATA = 1} chunkedState;

		char *buf;
		/* first argument is WaitressHandle_t, but that's not defined yet */
		WaitressHandlerReturn_t (*dataHandler) (void *, char *, const size_t);
		WaitressReturn_t (*read) (void *, char *, const size_t, size_t *);
		WaitressReturn_t (*write) (void *, const char *, const size_t);

		gnutls_session_t tlsSession;
	} request;
} WaitressHandle_t;

void WaitressInit (WaitressHandle_t *);
void WaitressFree (WaitressHandle_t *);
bool WaitressSetProxy (WaitressHandle_t *, const char *);
char *WaitressUrlEncode (const char *);
bool WaitressSetUrl (WaitressHandle_t *, const char *);
WaitressReturn_t WaitressFetchBuf (WaitressHandle_t *, char **);
WaitressReturn_t WaitressFetchCall (WaitressHandle_t *);
const char *WaitressErrorToStr (WaitressReturn_t);

#endif /* SRC_LIBWAITRESS_WAITRESS_H_ZE5NT8JI */