/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1980, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "rcv.h"
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * User commands.
 */

/*
 * Print the current active headings.
 * Don't change dot if invoker didn't give an argument.
 */

static int screen;

int
headers(void *v)
{
        int *msgvec = v;
        int n, mesg, flag, size;
        struct message *mp;

        size = screensize();
        n = msgvec[0];
        if (n != 0)
                screen = (n-1)/size;
        if (screen < 0)
                screen = 0;
        mp = &message[screen * size];
        if (mp >= &message[msgCount])
                mp = &message[msgCount - size];
        if (mp < &message[0])
                mp = &message[0];
        flag = 0;
        mesg = mp - &message[0];
        if (dot != &message[n-1])
                dot = mp;
        for (; mp < &message[msgCount]; mp++) {
                mesg++;
                if (mp->m_flag & MDELETED)
                        continue;
                if (flag++ >= size)
                        break;
                printhead(mesg);
        }
        if (flag == 0) {
                printf("No more mail.\n");
                return (1);
        }
        return (0);
}

/*
 * Scroll to the next/previous screen
 */
int
scroll(void *v)
{
        char *arg = v;
        int s, size;
        int cur[1];

        cur[0] = 0;
        size = screensize();
        s = screen;
        switch (*arg) {
        case 0:
        case '+':
                s++;
                if (s * size >= msgCount) {
                        printf("On last screenful of messages\n");
                        return (0);
                }
                screen = s;
                break;

        case '-':
                if (--s < 0) {
                        printf("On first screenful of messages\n");
                        return (0);
                }
                screen = s;
                break;

        default:
                printf("Unrecognized scrolling command \"%s\"\n", arg);
                return (1);
        }
        return (headers(cur));
}

/*
 * Compute screen size.
 */
int
screensize(void)
{
        int s;
        char *cp;

        if ((cp = value("screen")) != NULL && (s = atoi(cp)) > 0)
                return (s);
        return (screenheight - 4);
}

/*
 * Print out the headlines for each message
 * in the passed message list.
 */
int
from(void *v)
{
        int *msgvec = v;
        int *ip;

        for (ip = msgvec; *ip != 0; ip++)
                printhead(*ip);
        if (--ip >= msgvec)
                dot = &message[*ip - 1];
        return (0);
}

/*
 * Print out the header of a specific message.
 * This is a slight improvement to the standard one.
 */
void
printhead(int mesg)
{
        struct message *mp;
        char headline[LINESIZE], wcount[LINESIZE], *subjline, dispc, curind;
        char pbuf[BUFSIZ];
        struct headline hl;
        int subjlen;
        char *name;

        mp = &message[mesg-1];
        (void)readline(setinput(mp), headline, LINESIZE);
        if ((subjline = hfield("subject", mp)) == NULL)
                subjline = hfield("subj", mp);
        /*
         * Bletch!
         */
        curind = dot == mp ? '>' : ' ';
        dispc = ' ';
        if (mp->m_flag & MSAVED)
                dispc = '*';
        if (mp->m_flag & MPRESERVE)
                dispc = 'P';
        if ((mp->m_flag & (MREAD|MNEW)) == MNEW)
                dispc = 'N';
        if ((mp->m_flag & (MREAD|MNEW)) == 0)
                dispc = 'U';
        if (mp->m_flag & MBOX)
                dispc = 'M';
        parse(headline, &hl, pbuf);
        sprintf(wcount, "%3ld/%-5ld", mp->m_lines, mp->m_size);
        subjlen = screenwidth - 50 - strlen(wcount);
        name = value("show-rcpt") != NULL ?
                skin(hfield("to", mp)) : nameof(mp, 0);
        if (subjline == NULL || subjlen < 0)            /* pretty pathetic */
                printf("%c%c%3d %-20.20s  %16.16s %s\n",
                        curind, dispc, mesg, name, hl.l_date, wcount);
        else
                printf("%c%c%3d %-20.20s  %16.16s %s \"%.*s\"\n",
                        curind, dispc, mesg, name, hl.l_date, wcount,
                        subjlen, subjline);
}

/*
 * Print out the value of dot.
 */
int
pdot(void *arg __unused)
{
        printf("%td\n", dot - &message[0] + 1);
        return (0);
}

/*
 * Print out all the possible commands.
 */
int
pcmdlist(void *arg __unused)
{
        extern const struct cmd cmdtab[];
        const struct cmd *cp;
        int cc;

        printf("Commands are:\n");
        for (cc = 0, cp = cmdtab; cp->c_name != NULL; cp++) {
                cc += strlen(cp->c_name) + 2;
                if (cc > 72) {
                        printf("\n");
                        cc = strlen(cp->c_name) + 2;
                }
                if ((cp+1)->c_name != NULL)
                        printf("%s, ", cp->c_name);
                else
                        printf("%s\n", cp->c_name);
        }
        return (0);
}

/*
 * Paginate messages, honor ignored fields.
 */
int
more(void *v)
{
        int *msgvec = v;

        return (type1(msgvec, 1, 1));
}

/*
 * Paginate messages, even printing ignored fields.
 */
int
More(void *v)
{
        int *msgvec = v;

        return (type1(msgvec, 0, 1));
}

/*
 * Type out messages, honor ignored fields.
 */
int
type(void *v)
{
        int *msgvec = v;

        return (type1(msgvec, 1, 0));
}

/*
 * Type out messages, even printing ignored fields.
 */
int
Type(void *v)
{
        int *msgvec = v;

        return (type1(msgvec, 0, 0));
}

/*
 * Type out the messages requested.
 */
static jmp_buf  pipestop;
int
type1(int *msgvec, int doign, int page)
{
        int nlines, *ip;
        struct message *mp;
        char *cp;
        FILE *obuf;

        obuf = stdout;
        if (setjmp(pipestop))
                goto close_pipe;
        if (value("interactive") != NULL &&
            (page || (cp = value("crt")) != NULL)) {
                nlines = 0;
                if (!page) {
                        for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++)
                                nlines += message[*ip - 1].m_lines;
                }
                if (page || nlines > (*cp ? atoi(cp) : realscreenheight)) {
                        cp = value("PAGER");
                        if (cp == NULL || *cp == '\0')
                                cp = _PATH_LESS;
                        obuf = Popen(cp, "w");
                        if (obuf == NULL) {
                                warnx("%s", cp);
                                obuf = stdout;
                        } else
                                (void)signal(SIGPIPE, brokpipe);
                }
        }

        /*
         * Send messages to the output.
         *
         */
        for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
                mp = &message[*ip - 1];
                touch(mp);
                dot = mp;
                if (value("quiet") == NULL)
                        fprintf(obuf, "Message %d:\n", *ip);
                (void)sendmessage(mp, obuf, doign ? ignore : 0, NULL);
        }

close_pipe:
        if (obuf != stdout) {
                /*
                 * Ignore SIGPIPE so it can't cause a duplicate close.
                 */
                (void)signal(SIGPIPE, SIG_IGN);
                (void)Pclose(obuf);
                (void)signal(SIGPIPE, SIG_DFL);
        }
        return (0);
}

/*
 * Respond to a broken pipe signal --
 * probably caused by quitting more.
 */
/*ARGSUSED*/
void
brokpipe(int signo __unused)
{
        longjmp(pipestop, 1);
}

/*
 * Print the top so many lines of each desired message.
 * The number of lines is taken from the variable "toplines"
 * and defaults to 5.
 */
int
top(void *v)
{
        int *msgvec = v;
        int *ip;
        struct message *mp;
        int c, topl, lines, lineb;
        char *valtop, linebuf[LINESIZE];
        FILE *ibuf;

        topl = 5;
        valtop = value("toplines");
        if (valtop != NULL) {
                topl = atoi(valtop);
                if (topl < 0 || topl > 10000)
                        topl = 5;
        }
        lineb = 1;
        for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++) {
                mp = &message[*ip - 1];
                touch(mp);
                dot = mp;
                if (value("quiet") == NULL)
                        printf("Message %d:\n", *ip);
                ibuf = setinput(mp);
                c = mp->m_lines;
                if (!lineb)
                        printf("\n");
                for (lines = 0; lines < c && lines <= topl; lines++) {
                        if (readline(ibuf, linebuf, sizeof(linebuf)) < 0)
                                break;
                        puts(linebuf);
                        lineb = strspn(linebuf, " \t") == strlen(linebuf);
                }
        }
        return (0);
}

/*
 * Touch all the given messages so that they will
 * get mboxed.
 */
int
stouch(void *v)
{
        int *msgvec = v;
        int *ip;

        for (ip = msgvec; *ip != 0; ip++) {
                dot = &message[*ip-1];
                dot->m_flag |= MTOUCH;
                dot->m_flag &= ~MPRESERVE;
        }
        return (0);
}

/*
 * Make sure all passed messages get mboxed.
 */
int
mboxit(void *v)
{
        int *msgvec = v;
        int *ip;

        for (ip = msgvec; *ip != 0; ip++) {
                dot = &message[*ip-1];
                dot->m_flag |= MTOUCH|MBOX;
                dot->m_flag &= ~MPRESERVE;
        }
        return (0);
}

/*
 * List the folders the user currently has.
 */
int
folders(void *arg __unused)
{
        char dirname[PATHSIZE];
        char *cmd;

        if (getfold(dirname, sizeof(dirname)) < 0) {
                printf("No value set for \"folder\"\n");
                return (1);
        }
        if ((cmd = value("LISTER")) == NULL)
                cmd = "ls";
        (void)run_command(cmd, 0, -1, -1, dirname, NULL);
        return (0);
}

/*
 * Update the mail file with any new messages that have
 * come in since we started reading mail.
 */
int
inc(void *v __unused)
{
        int nmsg, mdot;

        nmsg = incfile();

        if (nmsg == 0)
                printf("No new mail.\n");
        else if (nmsg > 0) {
                mdot = newfileinfo(msgCount - nmsg);
                dot = &message[mdot - 1];
        } else
                printf("\"inc\" command failed...\n");

        return (0);
}