/**
* @file mail.h
* Public procs, macro defs, subcommand defines mudmail system.
* 
* Part of the core tbaMUD source code distribution, which is a derivative
* of, and continuation of, CircleMUD.
*                                                                        
* All rights reserved.  See license for complete information.                                                                
* Copyright (C) 1993, 94 by the Trustees of the Johns Hopkins University 
* CircleMUD is based on DikuMUD, Copyright (C) 1990, 1991.
* By Jeremy Elson.
*/
#ifndef _MAIL_H_
#define _MAIL_H_

/* You can modify the following constants to fit your own MUD.  */

/* minimum level a player must be to send mail	*/
#define MIN_MAIL_LEVEL 1

/* # of gold coins required to send mail	*/
#define STAMP_PRICE 150

/* Maximum size of mail in bytes (arbitrary)	*/
#define MAX_MAIL_SIZE 8192

/* size of mail file allocation blocks		*/
#define BLOCK_SIZE 100

/* General, publicly available functions */
SPECIAL(postmaster);

/* NOTE:  Make sure that your block size is big enough. If not, HEADER_BLOCK_
 * DATASIZE will end up negative.  This is a bad thing. Check the define below 
 * to make sure it is >0 when choosing values for NAME_SIZE and BLOCK_SIZE.  
 * 100 is a nice round number for BLOCK_SIZE and is the default. The mail system
 * will always allocate disk space in chunks of size BLOCK_SIZE. */

/* DON'T TOUCH DEFINES BELOW. */
int	scan_file(void);
int	has_mail(long recipient);
void	store_mail(long to, long from, char *message_pointer);
char	*read_delete(long recipient);
void    notify_if_playing(struct char_data *from, int recipient_id);

struct mail_t {
	long recipient;
	long sender;
	time_t sent_time;
	char *body;
};

/* old stuff below */
#define HEADER_BLOCK  (-1)
#define LAST_BLOCK    (-2)
#define DELETED_BLOCK (-3)

/* Note: next_block is part of header_blk in a data block; we can't combine them
 * here because we have to be able to differentiate a data block from a header 
 * block when booting mail system. */
struct header_data_type {
   long	next_block;		/* if header block, link to next block	*/
   long from;			/* idnum of the mail's sender		*/
   long to;			/* idnum of mail's recipient		*/
   time_t mail_time;		/* when was the letter mailed?		*/
};

/* size of the data part of a header block */
#define HEADER_BLOCK_DATASIZE \
	(BLOCK_SIZE - sizeof(long) - sizeof(struct header_data_type) - sizeof(char))

/* size of the data part of a data block */
#define DATA_BLOCK_DATASIZE (BLOCK_SIZE - sizeof(long) - sizeof(char))

/* note that an extra space is allowed in all string fields for the
   terminating null character.  */

struct header_block_type_d {
   long	block_type;		/* is this a header or data block?	*/
   struct header_data_type header_data;	/* other header data		*/
   char	txt[HEADER_BLOCK_DATASIZE+1]; /* actual text plus 1 for null	*/
};

struct data_block_type_d {
   long	block_type;		/* -1 if header block, -2 if last data block
      				   in mail, otherwise a link to the next */
   char	txt[DATA_BLOCK_DATASIZE+1]; /* actual text plus 1 for null	*/
};

typedef struct header_block_type_d header_block_type;
typedef struct data_block_type_d data_block_type;

struct position_list_type_d {
   long	position;
   struct position_list_type_d *next;
};

typedef struct position_list_type_d position_list_type;

struct mail_index_type_d {
   long recipient;			/* who is this mail for?	*/
   position_list_type *list_start;	/* list of mail positions	*/
   struct mail_index_type_d *next;	/* link to next one		*/
};

typedef struct mail_index_type_d mail_index_type;

#endif /* _MAIL_H_ */