/* $Header$
 *
 * This generates confirmation letters to people who recently set
 * their secure instance passwords.
 *
 *  (c) Copyright 1992 by the Massachusetts Institute of Technology.
 *  For copying and distribution information, please see the file
 *  <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <stdio.h>
#include <moira.h>
#include <moira_site.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/file.h>
EXEC SQL INCLUDE sqlca;

#define LETTER "letter.template"

extern int errno;
char *whoami = "letter.gen";


main(argc, argv)
int argc;
char **argv;
{
    FILE *out = stdout;
    char *outf = NULL, outft[64];
    struct stat sb;
    int flag;
    struct timeval tv;
    EXEC SQL BEGIN DECLARE SECTION;
    char login[10], first[17], last[17], fullname[34], addr[84];
    int lastrun, when;
    EXEC SQL END DECLARE SECTION;

#ifsql INGRES
    EXEC SQL CONNECT moira;
#endsql
#ifsql INFORMIX
    EXEC SQL DATABASE moira;
#endsql

    if (argc == 2) {
	if (stat(argv[1], &sb) == 0) {
	    if (ModDiff (&flag, "users", sb.st_mtime))
	      exit(MR_DATE);
	    if (flag < 0) {
		fprintf(stderr, "File %s does not need to be rebuilt.\n",
			argv[1]);
		exit(MR_NO_CHANGE);
	    }
	}
	outf = argv[1];
	sprintf(outft, "%s~", outf);
	if ((out = fopen(outft, "w")) == NULL) {
	    fprintf(stderr, "unable to open %s for output\n", outf);
	    exit(MR_OCONFIG);
	}
    } else if (argc != 1) {
	fprintf(stderr, "usage: %s [outfile]\n", argv[0]);
	exit(MR_ARGS);
    } else {
	outf = NULL;
    }

    init_letter();

    /* The following is declarative, not executed,
     * and so is dependent on where it is in the file,
     * not in the order of execution of statements.
     */
    EXEC SQL WHENEVER SQLERROR GOTO sqlerr;

    EXEC SQL SELECT secure INTO :lastrun FROM users WHERE users_id = 0;

    gettimeofday(&tv, NULL);

    EXEC SQL DECLARE x CURSOR FOR SELECT 
      login, first, last, xaddress, secure
	FROM users WHERE secure > :lastrun;
    EXEC SQL OPEN x;
    while (1) {
	EXEC SQL FETCH x INTO :login, :first, :last, :addr, :when;
	if (sqlca.sqlcode != 0) break;
	strtrim(login);
	strtrim(first);
	strtrim(last);
	sprintf(fullname, "%s %s", first, last);
	print_letter(out, login, fullname, strtrim(addr), when);
    }

    EXEC SQL CLOSE x;

    lastrun = tv.tv_sec;
    EXEC SQL UPDATE users SET secure = :lastrun WHERE users_id = 0;

#ifsql INGRES
    EXEC SQL DISCONNECT;
#endsql
#ifsql INFORMIX
    EXEC SQL CLOSE DATABASE;
#endsql

    if (fclose(out)) {
	perror("close failed");
	exit(MR_CCONFIG);
    }
    if (outf)
      fix_file(outf);
    exit(MR_SUCCESS);

 sqlerr:
    com_err(whoami, MR_INGRES_ERR, " code %d\n", sqlca.sqlcode);
    critical_alert("DCM", "Letter build encountered INGRES ERROR %d",
		   sqlca.sqlcode);
    exit(MR_INGRES_ERR);
}


char *letter_text;


/* Read the template into a buffer */

init_letter()
{
    int fd;
    char filename[256];
    struct stat stbuf;

    sprintf(filename, "%s/%s", DCM_DIR, LETTER);
    if ((fd = open(filename, O_RDONLY, 0)) < 0) {
	com_err(whoami, MR_OCONFIG, " opening letter template %s", filename);
	exit(MR_OCONFIG);
    }
    if (fstat(fd, &stbuf)) {
	com_err(whoami, MR_OCONFIG, " stating letter template %s", filename);
	exit(MR_OCONFIG);
    }
    if ((letter_text = (char *)malloc(stbuf.st_size + 1)) == NULL) {
	com_err(whoami, MR_NO_MEM, " reading letter template");
	exit(MR_NO_MEM);
    }
    if (read(fd, letter_text, stbuf.st_size) < stbuf.st_size) {
	com_err(whoami, MR_OCONFIG, " unable to read all of letter");
	exit(MR_OCONFIG);
    }
    letter_text[stbuf.st_size] = 0;
    close(fd);
}


/* Print out a copy of the letter */

print_letter(out, login, fullname, addr, when)
FILE *out;
char *login, *fullname, *addr;
int when;
{
    register char *p;
    char buf[256], *a1, *a2, *d;
    char *rindex();

    /* split address into two lines.
     * First determine if postal or interdepartmental address.
     * Postal addreses end in state & zip code, as in "MA02139"
     * Anything else, assume interdepartmental.
     */
    strcpy(buf, addr);
    a1 = buf;
    a2 = rindex(buf, ' ');	/* before state & zip */
    if (a2 && isupper(a2[1]) && isupper(a2[2]) &&
	isdigit(a2[3]) && isdigit(a2[4]) && isdigit(a2[5]) &&
	isdigit(a2[6]) && isdigit(a2[7])) {
	/* Must be postal address. */
	/* missing space between state & zip, fix */
	for (p = a2; *p; p++);		/* find end of string */
	for (p--; isdigit(*p); p--)
	  p[2] = p[1];
	p[2] = p[1];
	p[1] = ' ';
	/* Backup to previous space, start of state */
	for (; *a2 != ' '; a2--);
	/* Backup to previous space, start of city */
	for (a2--; *a2 != ' '; a2--);
	/* terminate first line, leave a2 pointing at second */
	*a2++ = 0;
    } else {
	/* Must be interdepartmental */
	a2 = "MIT INTERDEPARTMENTAL MAIL";
    }
    d = ctime(&when);
    d[strlen(d)-1] = 0;

    for (p = letter_text; *p; p++) {
	if (*p == '%') {
	    p++;
	    switch (*p) {
	    case 'l':
		fputs(login, out);
		break;
	    case 'n':
		fputs(fullname, out);
		break;
	    case 'A':
		fputs(addr, out);
		break;
	    case 'a':
		p++;
		switch (*p) {
		case '1':
		    fputs(a1, out);
		    break;
		case '2':
		    fputs(a2, out);
		    break;
		default:
		    fputs(addr, out);
		}
		break;
	    case 'd':
		fputs(d, out);
		break;
	    default:
		putc('%', out);
		putc(*p, out);
	    }
	} else
	  putc(*p, out);
    }
    fflush(out);
}