#ifndef EL__NETWORK_STATE_H
#define EL__NETWORK_STATE_H

#include "util/error.h"		/* assert() */

#ifdef __cplusplus
extern "C" {
#endif

struct terminal;

enum connection_priority {
	PRI_MAIN	= 0,
	PRI_DOWNLOAD	= 0,
	PRI_FRAME,
	PRI_IFRAME,
	PRI_CSS,
	PRI_NEED_IMG,
	PRI_IMG,
	PRI_PRELOAD,
	PRI_CANCEL,
	PRIORITIES,
};

typedef unsigned char connection_priority_T;

#define is_system_error(state)		((state).basic == S_ERRNO)
#define is_in_state(state,basic_)       ((state).basic == (basic_))
#define is_in_result_state(state)	((state).basic < 0)
#define is_in_progress_state(state)	((state).basic >= 0)
#define is_in_connecting_state(state)	(S_WAIT < (state).basic && (state).basic < S_TRANS)
#define is_in_transfering_state(state)	((state).basic >= S_TRANS)
#define is_in_queued_state(state)	(is_in_connecting_state(state) || (state).basic == S_WAIT)

/* FIXME: Namespace clash with Windows headers. */
#undef S_OK

enum connection_basic_state {
	/* States >= 0 are used for connections still in progress. */
	S_WAIT			= 0,
	S_DNS,
	S_CONN,
	S_SSL_NEG,
	S_SENT,
	S_LOGIN,
	S_GETH,
	S_PROC,
	S_TRANS,
	S_QUESTIONS,
	S_CONN_PEERS,
	S_CONN_TRACKER,
	S_RESUME,

	/* State < 0 are used for the final result of a connection
	 * (it's finished already and it ended up like this) */
	S_ERRNO			= -1,
	S_OK			= -100000,
	S_INTERRUPTED		= -100001,
	S_EXCEPT		= -100002,
	S_INTERNAL		= -100003,
	S_OUT_OF_MEM		= -100004,
	S_NO_DNS		= -100005,
	S_CANT_WRITE		= -100006,
	S_CANT_READ		= -100007,
	S_MODIFIED		= -100008,
	S_BAD_URL		= -100009,
	S_TIMEOUT		= -100010,
	S_RESTART		= -100011,
	S_STATE			= -100012,
	S_WAIT_REDIR		= -100013,
	S_LOCAL_ONLY		= -100014,
	S_UNKNOWN_PROTOCOL	= -100015,
	S_EXTERNAL_PROTOCOL	= -100016,
	S_ENCODE_ERROR		= -100017,
	S_SSL_ERROR		= -100018,
	S_NO_FORCED_DNS		= -100019,

	S_HTTP_ERROR		= -100100,
	S_HTTP_204		= -100101,
	S_HTTP_UPLOAD_RESIZED   = -100102,

	S_FILE_TYPE		= -100200,
	S_FILE_ERROR		= -100201,
	S_FILE_CGI_BAD_PATH	= -100202,
	S_FILE_ANONYMOUS	= -100203,

	S_FTP_ERROR		= -100300,
	S_FTP_UNAVAIL		= -100301,
	S_FTP_LOGIN		= -100302,
	S_FTP_PORT		= -100303,
	S_FTP_NO_FILE		= -100304,
	S_FTP_FILE_ERROR	= -100305,

	S_NNTP_ERROR		= -100400,
	S_NNTP_NEWS_SERVER	= -100401,
	S_NNTP_SERVER_HANG_UP	= -100402,
	S_NNTP_GROUP_UNKNOWN	= -100403,
	S_NNTP_ARTICLE_UNKNOWN	= -100404,
	S_NNTP_TRANSFER_ERROR	= -100405,
	S_NNTP_AUTH_REQUIRED	= -100406,
	S_NNTP_ACCESS_DENIED	= -100407,
	S_NNTP_SERVER_ERROR	= -100408,

	S_GOPHER_CSO_ERROR	= -100500,

	S_NO_JAVASCRIPT		= -100600,

	S_PROXY_ERROR		= -100700,

	S_BITTORRENT_ERROR	= -100800,
	S_BITTORRENT_METAINFO	= -100801,
	S_BITTORRENT_TRACKER	= -100802,
	S_BITTORRENT_BAD_URL	= -100803,
	S_BITTORRENT_PEER_URL   = -100804,

	S_FSP_OPEN_SESSION_UNKN = -100900,
};

typedef int connection_basic_state_T;

/** Either an ELinks internal status code or an error code from the
 * system.  Use connection_state() or connection_state_for_errno()
 * to construct objects of this type.  */
struct connection_state {
	/** An ELinks internal status code, or ::S_ERRNO if this
	 * structure holds a system error instead.  */
	connection_basic_state_T basic;

	/** When #basic is ::S_ERRNO, syserr is the saved value of
	 * errno.  Otherwise, syserr should be 0.  */
	int syserr;
};

char *get_state_message(struct connection_state state, struct terminal *term);
void done_state_message(void);

static inline struct connection_state
connection_state(connection_basic_state_T basic)
{
	struct connection_state state = {};

	assert(basic != S_ERRNO);
	if_assert_failed basic = S_INTERNAL;

	state.basic = basic;
	return state;
}

static inline struct connection_state
connection_state_for_errno(int syserr)
{
	struct connection_state state = {};

	/* read_encoded_file() can pass syserr==0 here, so don't
	 * assert otherwise.  */
	state.basic = S_ERRNO;
	state.syserr = syserr;
	return state;
}

#ifdef __cplusplus
}
#endif

#endif