/*      @(#)win.c       8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: win.c,v 1.14 2009/04/14 08:50:06 lukem Exp $   */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * 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 <string.h>
#include "defs.h"
#include "char.h"
#include "window_string.h"

/*
 * Higher level routines for dealing with windows.
 *
 * There are two types of windows: user window, and information window.
 * User windows are the ones with a pty and shell.  Information windows
 * are for displaying error messages, and other information.
 *
 * The windows are doubly linked in overlapping order and divided into
 * two groups: foreground and normal.  Information
 * windows are always foreground.  User windows can be either.
 * Addwin() adds a window to the list at the top of one of the two groups.
 * Deletewin() deletes a window.  Front() moves a window to the front
 * of its group.  Wwopen(), wwadd(), and wwdelete() should never be called
 * directly.
 */

/*
 * Open a user window.
 */
struct ww *
openwin(int id, int row, int col, int nrow, int ncol, int nline, char *label, int type, int uflags, char *shf, char **sh)
{
        struct ww *w;

        if (id < 0 && (id = findid()) < 0)
                return 0;
        if (row + nrow <= 0 || row > wwnrow - 1
            || col + ncol <= 0 || col > wwncol - 1) {
                error("Illegal window position.");
                return 0;
        }
        w = wwopen(type, 0, nrow, ncol, row, col, nline);
        if (w == NULL) {
                error("Can't open window: %s.", wwerror());
                return 0;
        }
        w->ww_id = id;
        window[id] = w;
        CLR(w->ww_uflags, WWU_ALLFLAGS);
        SET(w->ww_uflags, uflags);
        w->ww_alt = w->ww_w;
        if (label != NULL && setlabel(w, label) < 0)
                error("No memory for label.");
        wwcursor(w, 1);
        /*
         * We have to do this little maneuver to make sure
         * addwin() puts w at the top, so we don't waste an
         * insert and delete operation.
         */
        setselwin((struct ww *)0);
        addwin(w, 0);
        setselwin(w);
        if (wwspawn(w, shf, sh) < 0) {
                error("Can't execute %s: %s.", shf, wwerror());
                closewin(w);
                return 0;
        }
        return w;
}

int
findid(void)
{
        int i;

        for (i = 0; i < NWINDOW && window[i] != 0; i++)
                ;
        if (i >= NWINDOW) {
                error("Too many windows.");
                return -1;
        }
        return i;
}

struct ww *
findselwin(void)
{
        struct ww *w, *s = NULL;
        int i;

        for (i = 0; i < NWINDOW; i++)
                if ((w = window[i]) != NULL && w != selwin &&
                    (s == NULL ||
                     (!isfg(w) && (w->ww_order < s->ww_order || isfg(s)))))
                        s = w;
        return s;
}

/*
 * Close a user window.  Close all if w == 0.
 */
void
closewin(struct ww *w)
{
        char didit = 0;
        int i;

        if (w != NULL) {
                closewin1(w);
                didit++;
        } else
                for (i = 0; i < NWINDOW; i++) {
                        if ((w = window[i]) == NULL)
                                continue;
                        closewin1(w);
                        didit++;
                }
        if (didit) {
                if (selwin == 0) {
                        if (lastselwin != 0) {
                                setselwin(lastselwin);
                                lastselwin = 0;
                        } else if ((w = findselwin()))
                                setselwin(w);
                }
                if (lastselwin == 0 && selwin)
                        if ((w = findselwin()))
                                lastselwin = w;
                reframe();
        }
}

/*
 * Open an information (display) window.
 */
struct ww *
openiwin(int nrow, const char *label)
{
        struct ww *w;

        if ((w = wwopen(WWT_INTERNAL, 0, nrow, wwncol, 2, 0, 0)) == NULL)
                return 0;
        SET(w->ww_wflags, WWW_MAPNL | WWW_NOINTR | WWW_NOUPDATE | WWW_UNCTRL);
        SET(w->ww_uflags, WWU_HASFRAME | WWU_CENTER);
        w->ww_id = -1;
        (void) setlabel(w, label);
        addwin(w, 1);
        reframe();
        return w;
}

/*
 * Close an information window.
 */
void
closeiwin(struct ww *w)
{
        closewin1(w);
        reframe();
}

void
closewin1(struct ww *w)
{
        if (w == selwin)
                selwin = 0;
        if (w == lastselwin)
                lastselwin = 0;
        if (w->ww_id >= 0 && w->ww_id < NWINDOW)
                window[w->ww_id] = 0;
        if (w->ww_label)
                str_free(w->ww_label);
        deletewin(w);
        wwclose(w);
}

/*
 * Move the window to the top of its group.
 * Don't do it if already fully visible.
 * Wwvisible() doesn't work for tinted windows.
 * But anything to make it faster.
 * Always reframe() if doreframe is true.
 */
void
front(struct ww *w, char doreframe)
{
        if (w->ww_back != (isfg(w) ? framewin : fgwin) && !wwvisible(w)) {
                deletewin(w);
                addwin(w, isfg(w));
                doreframe = 1;
        }
        if (doreframe)
                reframe();
}

/*
 * Add a window at the top of normal windows or foreground windows.
 * For normal windows, we put it behind the current window.
 */
void
addwin(struct ww *w, char fg)
{
        if (fg) {
                wwadd(w, framewin);
                if (fgwin == framewin)
                        fgwin = w;
        } else
                wwadd(w, selwin != 0 && selwin != w && !isfg(selwin)
                                ? selwin : fgwin);
}

/*
 * Delete a window.
 */
void
deletewin(struct ww *w)
{
        if (fgwin == w)
                fgwin = w->ww_back;
        wwdelete(w);
}

void
reframe(void)
{
        struct ww *w;

        wwunframe(framewin);
        for (w = wwhead.ww_back; w != &wwhead; w = w->ww_back)
                if (ISSET(w->ww_uflags, WWU_HASFRAME)) {
                        wwframe(w, framewin);
                        labelwin(w);
                }
}

void
labelwin(struct ww *w)
{
        int mode = w == selwin ? WWM_REV : 0;

        if (!ISSET(w->ww_uflags, WWU_HASFRAME))
                return;
        if (w->ww_id >= 0) {
                char buf[2];

                buf[0] = w->ww_id + '1';
                buf[1] = 0;
                wwlabel(w, framewin, 1, buf, mode);
        }
        if (w->ww_label) {
                int col;

                if (ISSET(w->ww_uflags, WWU_CENTER)) {
                        col = (w->ww_w.nc - strlen(w->ww_label)) / 2;
                        col = MAX(3, col);
                } else
                        col = 3;
                wwlabel(w, framewin, col, w->ww_label, mode);
        }
}

void
stopwin(struct ww *w)
{
        if (w->ww_pty >= 0 && w->ww_type == WWT_PTY && wwstoptty(w->ww_pty) < 0)
                error("Can't stop output: %s.", wwerror());
        else
                SET(w->ww_pflags, WWP_STOPPED);
}

void
startwin(struct ww *w)
{
        if (w->ww_pty >= 0 && w->ww_type == WWT_PTY &&
            wwstarttty(w->ww_pty) < 0)
                error("Can't start output: %s.", wwerror());
        else
                CLR(w->ww_pflags, WWP_STOPPED);
}

void
sizewin(struct ww *w, int nrow, int ncol)
{
        struct ww *back = w->ww_back;

        w->ww_alt.nr = w->ww_w.nr;
        w->ww_alt.nc = w->ww_w.nc;
        wwdelete(w);
        if (wwsize(w, nrow, ncol) < 0)
                error("Can't resize window: %s.", wwerror());
        wwadd(w, back);
        reframe();
}

void
waitnl(struct ww *w)
{
        (void) waitnl1(w, "[Type any key to continue]");
}

int
more(struct ww *w, char always)
{
        int c;
        int uc = ISSET(w->ww_wflags, WWW_UNCTRL);

        if (!always && w->ww_cur.r < w->ww_w.b - 2)
                return 0;
        c = waitnl1(w, "[Type escape to abort, any other key to continue]");
        CLR(w->ww_wflags, WWW_UNCTRL);
        wwputs("\033E", w);
        SET(w->ww_wflags, uc);
        return c == ctrl('[') ? 2 : 1;
}

int
waitnl1(struct ww *w, const char *prompt)
{
        int uc = ISSET(w->ww_wflags, WWW_UNCTRL);

        CLR(w->ww_wflags, WWW_UNCTRL);
        front(w, 0);
        wwprintf(w, "\033Y%c%c\033sA%s\033rA ",
                w->ww_w.nr - 1 + ' ', ' ', prompt);     /* print on last line */
        wwcurtowin(w);
        while (wwpeekc() < 0)
                wwiomux();
        SET(w->ww_wflags, uc);
        return wwgetc();
}