/*
 * Copyright (c) 2021 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.
 */

/* forward declarations */
struct session;
struct session_menu_option;

#ifndef __SESSION_H__
#define __SESSION_H__

#include <stdlib.h>

#include "db.h"
#include "uthread.h"
#include "user.h"

enum session_input_state {
	SESSION_INPUT_NONE,
	SESSION_INPUT_LINE,
	SESSION_INPUT_CHAR
};

/* must keep sessions area_labels[] in sync */
enum session_area {
	SESSION_AREA_MAIN_MENU,
	SESSION_AREA_MOTD,
	SESSION_AREA_BOARDS,
	SESSION_AREA_FTN,
	SESSION_AREA_CHAT,
	SESSION_AREA_MAIL,
	SESSION_AREA_FILES,
	SESSION_AREA_WHO,
	SESSION_AREA_RECENT_LOGINS,
	SESSION_AREA_SETTINGS,
	SESSION_AREA_SIGNUP
};

#define DEFAULT_TERMINAL_COLUMNS	80
#define DEFAULT_TERMINAL_LINES		24
#define MIN_TERMINAL_COLUMNS		20
#define MIN_TERMINAL_LINES			4

#define CONTROL_C					3
#define CONTROL_D					4
#define BACKSPACE					8
#define CONTROL_L					12
#define DELETE						127

#define KEY_UP						(0x0100 | 'A')
#define KEY_DOWN					(0x0100 | 'B')
#define KEY_RIGHT					(0x0100 | 'C')
#define KEY_LEFT					(0x0100 | 'D')
#define KEY_OTHER					(0x0100 | 0xff)

typedef struct session session;

struct node_funcs {
	void (*setup)(struct session *session);
	short (*input)(struct session *session);
	short (*output)(struct session *session);
	void (*close)(struct session *session);
};

struct session_log {
	unsigned long id;
	char username[DB_USERNAME_LENGTH + 1];
	char node[10];
	char via[10];
	unsigned long logged_on_at;
	unsigned long logged_off_at;
	unsigned long ip_address;
	unsigned short tspeed;
	char location[32];
};

struct session {
	char node[16];
	char via[16];
	char location[32];
	unsigned char obuf[768];
	unsigned long obuf_canary;
	unsigned char ibuf[512];
	unsigned long ibuf_canary;
	short obuflen;
	unsigned long obuflen_canary;
	short ibuflen;
	unsigned long ibuflen_canary;
	short ibufoff;
	unsigned long established_at;
	char autologin_username[DB_USERNAME_LENGTH + 1];
	char terminal_type[24];
	enum session_input_state input_state;
	unsigned short last_input;
	unsigned long last_input_at;
	unsigned short terminal_columns;
	unsigned short terminal_lines;
	unsigned short tspeed;
	bool logged_in;
	bool ending;
	bool abort_input;
	bool ban_node_source;
	bool vt100;
	bool vt52;
	bool color;
	bool direct_output;
	bool is_telnet;
	bool can_nomodem;
	char chatting_with_node[16];
	char chat_username[DB_USERNAME_LENGTH + 1];
	bool chatting;
	short area;
	struct session_log log;
	struct user *user;
	void *cookie;
	struct node_funcs *node_funcs;
	struct uthread *uthread;
};

#define MAX_SESSIONS NUM_UTHREADS
extern struct session *sessions[MAX_SESSIONS];
extern short nsessions;

struct session_tally {
	char date[9];
	unsigned long calls;
};
extern struct session_tally session_today_tally;

struct session_menu_option {
	char ret;
	char key[15];
	char title[50];
};

struct session * session_create(char *node, char *via,
  struct node_funcs *node_funcs);
void session_close(struct session *session);
void session_idle(struct session *session);
short session_get_char(struct session *session, unsigned char *b);
short session_get_chars(struct session *session, unsigned char *b,
  size_t count);
bool session_wait_for_chars(struct session *session,
  unsigned short timeout_ms, unsigned short num_chars);
unsigned short session_input_char(struct session *session);
void session_clear_input(struct session *session);
void session_flush(struct session *session);
size_t session_logf(struct session *session, const char *format, ...);
size_t session_logf_buffered(struct session *session, const char *format, ...);
size_t session_output(struct session *session, const char *str, size_t len);
size_t session_paginate(struct session *session, const char *str,
  size_t len, size_t first_page_printed);
size_t session_printf(struct session *session, const char *format, ...);
size_t session_output_view_or_printf(struct session *session, short id,
  const char *format, ...);
size_t session_output_template(struct session *session, const char *str);
size_t session_expand_template(struct session *session, const char *str,
  char **ret);
char * session_field_input(struct session *session, unsigned short size,
  unsigned short width, char *initial_input, bool multiline, char mask);
void session_pause_return(struct session *s, char enforce, char *msg);
void session_print_motd(struct session *s, bool force);
void session_recents(struct session *s);
void session_who(struct session *s);
char session_menu(struct session *s, char *title, char *prompt,
  char *prompt_help, const struct session_menu_option *opts, size_t nopts,
  bool show_opts, char *number_prompt, short *ret_number);
void session_prune_logs(short days);
void session_check_buf_canaries(struct session *session);

#endif /* __SESSION_H__ */