#ifndef PROTOCOL_H
#define PROTOCOL_H
#include <stdbool.h>
#include <stdio.h>
#include <time.h>

#include "array.h"
#include "better_string.h"
#include "hash_table.h"
#include <openssl/sha.h>

#define MAX_OP_LEN 10
#define MAX_ARG_LEN 50
#define MAX_ARGS 5
#define MAX_BUFSIZE 4096
#define DEFAULT_PORT 11111
#define MAX_CONNECTIONS 32768
#define DEFAULT_TIMEOUT 6000
#define USERNAME_SIZE 30
#define KEYLEN 512

typedef struct {
  array_t *friends;
  /* if NULL then guest */
  unsigned char *passhash;
  array_t *autojoin;
  array_t *dms;
  string_t *name;
} account_t;

typedef struct {
  /*! @brief nick who sent the message */
  string_t *nick;
  /*! @brief message content */
  string_t *msg;
  /*! @brief Unix time */
  time_t time;
} message_t;

/*! @brief describes multiple user chats */
typedef struct CHANNEL_STRUCT {
  account_t *admin;
  /*! @brief account_t array */
  array_t *mods;
  /*! @brief No guests */
  bool registered_only;
  /*! @brief account_t array
   * if set, allowed_users creates a private conversation with only
   * these users
   */
  array_t *allowed_users;
  /*! @brief Explicitly banned users, account_t array */
  array_t *banned_users;
  /*! @brief account_t array */
  array_t *users;
  /*! @brief Description of channel can be set after creation */
  string_t *desc;
  /*! @brief message logs */
  array_t *msgs;
} channel_t;

/*! @brief struct that contains DM */
typedef struct DM_STRUCT {
  account_t *src;
  array_t *msgs;
} dm_t;

typedef struct SERVER_STRUCT server_t;

/*! @brief wrapper for server handler that conforms to C spec */
typedef struct SFUNC_STRUCT {
  /*! @brief In C spec, function pointers are not the same size as regular pointers */
  void (*f)(server_t *, list_t *);
} sfunc_t;

/*! @brief Server state encapsulation */
struct SERVER_STRUCT {
  /*! @brief account name => user_t */
  ht_t *accmap;
  /*! @brief username => user_t */
  ht_t *usermap;
  /*! @brief account name => friends */
  ht_t *friendmap;
  /*! @brief fd (int) => string_t */
  ht_t *fdmap;
  /*! @brief channel name => channel_t */
  ht_t *chanmap;

  /*! @brief op name => sfunc_t */
  ht_t *opmap;

  struct pollfd *fds;
  int nfds;
  size_t fd_capacity;
};

string_t *date_str();

bool same_day(struct tm *date1, struct tm *date2);

string_t *encode_chanstate(ht_t *chans);

string_t *encode_usersstate(ht_t *u);

message_t *init_message(string_t *nick, string_t *msg, time_t time);

void cop_ok(server_t *s, list_t *args);

void cop_nop(server_t *s, list_t *args);

server_t *init_server(size_t size);

void server_addop(server_t *s, void (*sfunc)(server_t *s, list_t *args));

void server_execop(server_t *s, list_t *stk);
#endif