/* $OpenBSD$ */

/*
* Copyright (c) 2009 Nicholas Marriott <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
* Increase or decrease pane size.
*/

static enum cmd_retval  cmd_resize_pane_exec(struct cmd *, struct cmdq_item *);

static void     cmd_resize_pane_mouse_update(struct client *,
                   struct mouse_event *);

const struct cmd_entry cmd_resize_pane_entry = {
       .name = "resize-pane",
       .alias = "resizep",

       .args = { "DLMRTt:Ux:y:Z", 0, 1, NULL },
       .usage = "[-DLMRTUZ] [-x width] [-y height] " CMD_TARGET_PANE_USAGE " "
                "[adjustment]",

       .target = { 't', CMD_FIND_PANE, 0 },

       .flags = CMD_AFTERHOOK,
       .exec = cmd_resize_pane_exec
};

static enum cmd_retval
cmd_resize_pane_exec(struct cmd *self, struct cmdq_item *item)
{
       struct args             *args = cmd_get_args(self);
       struct cmd_find_state   *target = cmdq_get_target(item);
       struct key_event        *event = cmdq_get_event(item);
       struct window_pane      *wp = target->wp;
       struct winlink          *wl = target->wl;
       struct window           *w = wl->window;
       struct client           *c = cmdq_get_client(item);
       struct session          *s = target->s;
       const char              *errstr;
       char                    *cause;
       u_int                    adjust;
       int                      x, y, status;
       struct grid             *gd = wp->base.grid;

       if (args_has(args, 'T')) {
               if (!TAILQ_EMPTY(&wp->modes))
                       return (CMD_RETURN_NORMAL);
               adjust = screen_size_y(&wp->base) - 1 - wp->base.cy;
               if (adjust > gd->hsize)
                       adjust = gd->hsize;
               grid_remove_history(gd, adjust);
               wp->base.cy += adjust;
               wp->flags |= PANE_REDRAW;
               return (CMD_RETURN_NORMAL);
       }

       if (args_has(args, 'M')) {
               if (!event->m.valid || cmd_mouse_window(&event->m, &s) == NULL)
                       return (CMD_RETURN_NORMAL);
               if (c == NULL || c->session != s)
                       return (CMD_RETURN_NORMAL);
               c->tty.mouse_drag_update = cmd_resize_pane_mouse_update;
               cmd_resize_pane_mouse_update(c, &event->m);
               return (CMD_RETURN_NORMAL);
       }

       if (args_has(args, 'Z')) {
               if (w->flags & WINDOW_ZOOMED)
                       window_unzoom(w, 1);
               else
                       window_zoom(wp);
               server_redraw_window(w);
               return (CMD_RETURN_NORMAL);
       }
       server_unzoom_window(w);

       if (args_count(args) == 0)
               adjust = 1;
       else {
               adjust = strtonum(args_string(args, 0), 1, INT_MAX, &errstr);
               if (errstr != NULL) {
                       cmdq_error(item, "adjustment %s", errstr);
                       return (CMD_RETURN_ERROR);
               }
       }

       if (args_has(args, 'x')) {
               x = args_percentage(args, 'x', 0, INT_MAX, w->sx, &cause);
               if (cause != NULL) {
                       cmdq_error(item, "width %s", cause);
                       free(cause);
                       return (CMD_RETURN_ERROR);
               }
               layout_resize_pane_to(wp, LAYOUT_LEFTRIGHT, x);
       }
       if (args_has(args, 'y')) {
               y = args_percentage(args, 'y', 0, INT_MAX, w->sy, &cause);
               if (cause != NULL) {
                       cmdq_error(item, "height %s", cause);
                       free(cause);
                       return (CMD_RETURN_ERROR);
               }
               status = options_get_number(w->options, "pane-border-status");
               switch (status) {
               case PANE_STATUS_TOP:
                       if (y != INT_MAX && wp->yoff == 1)
                               y++;
                       break;
               case PANE_STATUS_BOTTOM:
                       if (y != INT_MAX && wp->yoff + wp->sy == w->sy - 1)
                               y++;
                       break;
               }
               layout_resize_pane_to(wp, LAYOUT_TOPBOTTOM, y);
       }

       if (args_has(args, 'L'))
               layout_resize_pane(wp, LAYOUT_LEFTRIGHT, -adjust, 1);
       else if (args_has(args, 'R'))
               layout_resize_pane(wp, LAYOUT_LEFTRIGHT, adjust, 1);
       else if (args_has(args, 'U'))
               layout_resize_pane(wp, LAYOUT_TOPBOTTOM, -adjust, 1);
       else if (args_has(args, 'D'))
               layout_resize_pane(wp, LAYOUT_TOPBOTTOM, adjust, 1);
       server_redraw_window(wl->window);

       return (CMD_RETURN_NORMAL);
}

static void
cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
{
       struct winlink          *wl;
       struct window           *w;
       u_int                    y, ly, x, lx;
       static const int         offsets[][2] = {
           { 0, 0 }, { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 },
       };
       struct layout_cell      *cells[nitems(offsets)], *lc;
       u_int                    ncells = 0, i, j, resizes = 0;
       enum layout_type         type;

       wl = cmd_mouse_window(m, NULL);
       if (wl == NULL) {
               c->tty.mouse_drag_update = NULL;
               return;
       }
       w = wl->window;

       y = m->y + m->oy; x = m->x + m->ox;
       if (m->statusat == 0 && y >= m->statuslines)
               y -= m->statuslines;
       else if (m->statusat > 0 && y >= (u_int)m->statusat)
               y = m->statusat - 1;
       ly = m->ly + m->oy; lx = m->lx + m->ox;
       if (m->statusat == 0 && ly >= m->statuslines)
               ly -= m->statuslines;
       else if (m->statusat > 0 && ly >= (u_int)m->statusat)
               ly = m->statusat - 1;

       for (i = 0; i < nitems(cells); i++) {
               lc = layout_search_by_border(w->layout_root, lx + offsets[i][0],
                   ly + offsets[i][1]);
               if (lc == NULL)
                       continue;

               for (j = 0; j < ncells; j++) {
                       if (cells[j] == lc) {
                               lc = NULL;
                               break;
                       }
               }
               if (lc == NULL)
                       continue;

               cells[ncells] = lc;
               ncells++;
       }
       if (ncells == 0)
               return;

       for (i = 0; i < ncells; i++) {
               type = cells[i]->parent->type;
               if (y != ly && type == LAYOUT_TOPBOTTOM) {
                       layout_resize_layout(w, cells[i], type, y - ly, 0);
                       resizes++;
               } else if (x != lx && type == LAYOUT_LEFTRIGHT) {
                       layout_resize_layout(w, cells[i], type, x - lx, 0);
                       resizes++;
               }
       }
       if (resizes != 0)
               server_redraw_window(w);
}

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