/*
 * Copyright (c) 2022 joshua stein <jcs@jcs.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef __IRC_H__
#define __IRC_H__

#include "chatter.h"
#include "tcp.h"
#include "util.h"

enum {
	IRC_STATE_DISCONNECTED = 0,
	IRC_STATE_DEAD,
	IRC_STATE_CONNECTING,
	IRC_STATE_CONNECTED
};

#define IRC_MSG_MAX_ARGS 6

struct irc_msg {
	short code;
	char cmd[16];
	char source[64];
	char msg[512];
	char arg[IRC_MSG_MAX_ARGS][64];
};

struct irc_user {
	char nick[32];
	char username[32];
	char hostname[128];
};

struct irc_channel_nick {
	char nick[32];
	char flags;
#define IRC_NICK_FLAG_OP	(7 << 0)
#define IRC_NICK_FLAG_VOICE	(6 << 0)
	short next_nick;
};

struct irc_channel {
	SLIST_ENTRY(irc_channel) list;
	struct chatter *chatter;
	struct irc_connection *connection;
	struct irc_channel_nick *nicks;
	size_t nnicks;
	size_t nicks_size;
	short first_nick;
	char name[64];
	char topic[400];
};
SLIST_HEAD(irc_channels_head, irc_channel);

struct irc_connection {
	SLIST_ENTRY(irc_connection) list;
	short state;
	struct chatter *chatter;
	char *hostname;
	short port;
	char *password;
	char *nick;
	char *ident;
	char *realname;
	char *channel_autojoin;
	bool did_autojoin;
	struct irc_channels_head channels_list;
	short nchannels;
	TCPiopb rcv_pb, send_pb, close_pb;
	TCPStatusPB status_pb;
	StreamPtr stream;
	wdsEntry wds[2];
	char obuf[512];
	char ibuf[512]; /* RFC2812 says max line will be 512 */
	char line[512];
	short ibuflen;
	short linelen;
	/* docs say 4*MTU+1024, but MTU will probably be <1500 */
	unsigned char tcp_buf[(4 * 1500) + 1024];
};
SLIST_HEAD(irc_connections_head, irc_connection);
extern struct irc_connections_head irc_connections_list;

struct irc_connection * irc_connect(struct chatter *chatter,
  const char *server, const unsigned short port, const char *password,
  const char *nick, const char *ident, const char *realname,
  const char *channel);
void irc_close_connection(struct irc_connection *conn);
void irc_dealloc_connection(struct irc_connection *conn);
void irc_process(struct irc_connection *conn);
void irc_abort(struct irc_connection *conn);
void irc_close(struct irc_connection *conn);
void irc_process_input(struct irc_connection *conn,
  struct irc_channel *channel, char *input);

#endif