/* $OpenBSD$ */

/*

 * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>

 *

 * 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"

/*

 * Display a menu on a client.

 */

static enum args_parse_type cmd_display_menu_args_parse(struct args *,

            u_int, char **);

static enum cmd_retval    cmd_display_menu_exec(struct cmd *,

            struct cmdq_item *);

static enum cmd_retval    cmd_display_popup_exec(struct cmd *,

            struct cmdq_item *);

const struct cmd_entry cmd_display_menu_entry = {

  .name = "display-menu",

  .alias = "menu",

  .args = { "b:c:C:H:s:S:Ot:T:x:y:", 1, -1, cmd_display_menu_args_parse },

  .usage = "[-O] [-b border-lines] [-c target-client] "

     "[-C starting-choice] [-H selected-style] [-s style] "

     "[-S border-style] " CMD_TARGET_PANE_USAGE "[-T title] "

     "[-x position] [-y position] name key command ...",

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

  .flags = CMD_AFTERHOOK|CMD_CLIENT_CFLAG,

  .exec = cmd_display_menu_exec

};

const struct cmd_entry cmd_display_popup_entry = {

  .name = "display-popup",

  .alias = "popup",

  .args = { "Bb:Cc:d:e:Eh:s:S:t:T:w:x:y:", 0, -1, NULL },

  .usage = "[-BCE] [-b border-lines] [-c target-client] "

     "[-d start-directory] [-e environment] [-h height] "

     "[-s style] [-S border-style] " CMD_TARGET_PANE_USAGE

     "[-T title] [-w width] [-x position] [-y position] "

     "[shell-command]",

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

  .flags = CMD_AFTERHOOK|CMD_CLIENT_CFLAG,

  .exec = cmd_display_popup_exec

};

static enum args_parse_type

cmd_display_menu_args_parse(struct args *args, u_int idx, __unused char **cause)

{

  u_int      i = 0;

  enum args_parse_type   type = ARGS_PARSE_STRING;

  for (;;) {

    type = ARGS_PARSE_STRING;

    if (i == idx)

      break;

    if (*args_string(args, i++) == '\0')

      continue;

    type = ARGS_PARSE_STRING;

    if (i++ == idx)

      break;

    type = ARGS_PARSE_COMMANDS_OR_STRING;

    if (i++ == idx)

      break;

  }

  return (type);

}

static int

cmd_display_menu_get_position(struct client *tc, struct cmdq_item *item,

    struct args *args, u_int *px, u_int *py, u_int w, u_int h)

{

  struct tty    *tty = &tc->tty;

  struct cmd_find_state *target = cmdq_get_target(item);

  struct key_event  *event = cmdq_get_event(item);

  struct session    *s = tc->session;

  struct winlink    *wl = target->wl;

  struct window_pane  *wp = target->wp;

  struct style_ranges *ranges = NULL;

  struct style_range  *sr = NULL;

  const char    *xp, *yp;

  char      *p;

  int      top;

  u_int      line, ox, oy, sx, sy, lines, position;

  long       n;

  struct format_tree  *ft;

  /*

   * Work out the position from the -x and -y arguments. This is the

   * bottom-left position.

   */

  /* If the popup is too big, stop now. */

  if (w > tty->sx || h > tty->sy)

    return (0);

  /* Create format with mouse position if any. */

  ft = format_create_from_target(item);

  if (event->m.valid) {

    format_add(ft, "popup_mouse_x", "%u", event->m.x);

    format_add(ft, "popup_mouse_y", "%u", event->m.y);

  }

  /*

   * If there are any status lines, add this window position and the

   * status line position.

   */

  top = status_at_line(tc);

  if (top != -1) {

    lines = status_line_size(tc);

    if (top == 0)

      top = lines;

    else

      top = 0;

    position = options_get_number(s->options, "status-position");

    for (line = 0; line < lines; line++) {

      ranges = &tc->status.entries[line].ranges;

      TAILQ_FOREACH(sr, ranges, entry) {

        if (sr->type != STYLE_RANGE_WINDOW)

          continue;

        if (sr->argument == (u_int)wl->idx)

          break;

      }

      if (sr != NULL)

        break;

    }

    if (sr != NULL) {

      format_add(ft, "popup_window_status_line_x", "%u",

          sr->start);

      if (position == 0) {

        format_add(ft, "popup_window_status_line_y",

            "%u", line + 1 + h);

      } else {

        format_add(ft, "popup_window_status_line_y",

            "%u", tty->sy - lines + line);

      }

    }

    if (position == 0)

      format_add(ft, "popup_status_line_y", "%u", lines + h);

    else {

      format_add(ft, "popup_status_line_y", "%u",

          tty->sy - lines);

    }

  } else

    top = 0;

  /* Popup width and height. */

  format_add(ft, "popup_width", "%u", w);

  format_add(ft, "popup_height", "%u", h);

  /* Position so popup is in the centre. */

  n = (long)(tty->sx - 1) / 2 - w / 2;

  if (n < 0)

    format_add(ft, "popup_centre_x", "%u", 0);

  else

    format_add(ft, "popup_centre_x", "%ld", n);

  n = (tty->sy - 1) / 2 + h / 2;

  if (n >= tty->sy)

    format_add(ft, "popup_centre_y", "%u", tty->sy - h);

  else

    format_add(ft, "popup_centre_y", "%ld", n);

  /* Position of popup relative to mouse. */

  if (event->m.valid) {

    n = (long)event->m.x - w / 2;

    if (n < 0)

      format_add(ft, "popup_mouse_centre_x", "%u", 0);

    else

      format_add(ft, "popup_mouse_centre_x", "%ld", n);

    n = event->m.y - h / 2;

    if (n + h >= tty->sy) {

      format_add(ft, "popup_mouse_centre_y", "%u",

          tty->sy - h);

    } else

      format_add(ft, "popup_mouse_centre_y", "%ld", n);

    n = (long)event->m.y + h;

    if (n >= tty->sy)

      format_add(ft, "popup_mouse_top", "%u", tty->sy - 1);

    else

      format_add(ft, "popup_mouse_top", "%ld", n);

    n = event->m.y - h;

    if (n < 0)

      format_add(ft, "popup_mouse_bottom", "%u", 0);

    else

      format_add(ft, "popup_mouse_bottom", "%ld", n);

  }

  /* Position in pane. */

  tty_window_offset(&tc->tty, &ox, &oy, &sx, &sy);

  n = top + wp->yoff - oy + h;

  if (n >= tty->sy)

    format_add(ft, "popup_pane_top", "%u", tty->sy - h);

  else

    format_add(ft, "popup_pane_top", "%ld", n);

  format_add(ft, "popup_pane_bottom", "%u", top + wp->yoff + wp->sy - oy);

  format_add(ft, "popup_pane_left", "%u", wp->xoff - ox);

  n = (long)wp->xoff + wp->sx - ox - w;

  if (n < 0)

    format_add(ft, "popup_pane_right", "%u", 0);

  else

    format_add(ft, "popup_pane_right", "%ld", n);

  /* Expand horizontal position. */

  xp = args_get(args, 'x');

  if (xp == NULL || strcmp(xp, "C") == 0)

    xp = "#{popup_centre_x}";

  else if (strcmp(xp, "R") == 0)

    xp = "#{popup_pane_right}";

  else if (strcmp(xp, "P") == 0)

    xp = "#{popup_pane_left}";

  else if (strcmp(xp, "M") == 0)

    xp = "#{popup_mouse_centre_x}";

  else if (strcmp(xp, "W") == 0)

    xp = "#{popup_window_status_line_x}";

  p = format_expand(ft, xp);

  n = strtol(p, NULL, 10);

  if (n + w >= tty->sx)

    n = tty->sx - w;

  else if (n < 0)

    n = 0;

  *px = n;

  log_debug("%s: -x: %s = %s = %u (-w %u)", __func__, xp, p, *px, w);

  free(p);

  /* Expand vertical position  */

  yp = args_get(args, 'y');

  if (yp == NULL || strcmp(yp, "C") == 0)

    yp = "#{popup_centre_y}";

  else if (strcmp(yp, "P") == 0)

    yp = "#{popup_pane_bottom}";

  else if (strcmp(yp, "M") == 0)

    yp = "#{popup_mouse_top}";

  else if (strcmp(yp, "S") == 0)

    yp = "#{popup_status_line_y}";

  else if (strcmp(yp, "W") == 0)

    yp = "#{popup_window_status_line_y}";

  p = format_expand(ft, yp);

  n = strtol(p, NULL, 10);

  if (n < h)

    n = 0;

  else

    n -= h;

  if (n + h >= tty->sy)

    n = tty->sy - h;

  else if (n < 0)

    n = 0;

  *py = n;

  log_debug("%s: -y: %s = %s = %u (-h %u)", __func__, yp, p, *py, h);

  free(p);

  format_free(ft);

  return (1);

}

static enum cmd_retval

cmd_display_menu_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 client   *tc = cmdq_get_target_client(item);

  struct menu   *menu = NULL;

  struct menu_item   menu_item;

  const char    *key, *name, *value;

  const char    *style = args_get(args, 's');

  const char    *border_style = args_get(args, 'S');

  const char    *selected_style = args_get(args, 'H');

  enum box_lines     lines = BOX_LINES_DEFAULT;

  char      *title, *cause;

  int      flags = 0, starting_choice = 0;

  u_int      px, py, i, count = args_count(args);

  struct options    *o = target->s->curw->window->options;

  struct options_entry  *oe;

  if (tc->overlay_draw != NULL)

    return (CMD_RETURN_NORMAL);

  if (args_has(args, 'C')) {

    if (strcmp(args_get(args, 'C'), "-") == 0)

      starting_choice = -1;

    else {

      starting_choice = args_strtonum(args, 'C', 0, UINT_MAX,

          &cause);

      if (cause != NULL) {

        cmdq_error(item, "starting choice %s", cause);

        free(cause);

        return (CMD_RETURN_ERROR);

      }

    }

  }

  if (args_has(args, 'T'))

    title = format_single_from_target(item, args_get(args, 'T'));

  else

    title = xstrdup("");

  menu = menu_create(title);

  free(title);

  for (i = 0; i != count; /* nothing */) {

    name = args_string(args, i++);

    if (*name == '\0') {

      menu_add_item(menu, NULL, item, tc, target);

      continue;

    }

    if (count - i < 2) {

      cmdq_error(item, "not enough arguments");

      menu_free(menu);

      return (CMD_RETURN_ERROR);

    }

    key = args_string(args, i++);

    menu_item.name = name;

    menu_item.key = key_string_lookup_string(key);

    menu_item.command = args_string(args, i++);

    menu_add_item(menu, &menu_item, item, tc, target);

  }

  if (menu == NULL) {

    cmdq_error(item, "invalid menu arguments");

    return (CMD_RETURN_ERROR);

  }

  if (menu->count == 0) {

    menu_free(menu);

    return (CMD_RETURN_NORMAL);

  }

  if (!cmd_display_menu_get_position(tc, item, args, &px, &py,

      menu->width + 4, menu->count + 2)) {

    menu_free(menu);

    return (CMD_RETURN_NORMAL);

  }

  value = args_get(args, 'b');

  if (value != NULL) {

    oe = options_get(o, "menu-border-lines");

    lines = options_find_choice(options_table_entry(oe), value,

        &cause);

    if (lines == -1) {

      cmdq_error(item, "menu-border-lines %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

  }

  if (args_has(args, 'O'))

    flags |= MENU_STAYOPEN;

  if (!event->m.valid)

    flags |= MENU_NOMOUSE;

  if (menu_display(menu, flags, starting_choice, item, px, py, tc, lines,

      style, selected_style, border_style, target, NULL, NULL) != 0)

    return (CMD_RETURN_NORMAL);

  return (CMD_RETURN_WAIT);

}

static enum cmd_retval

cmd_display_popup_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 session    *s = target->s;

  struct client   *tc = cmdq_get_target_client(item);

  struct tty    *tty = &tc->tty;

  const char    *value, *shell, *shellcmd = NULL;

  const char    *style = args_get(args, 's');

  const char    *border_style = args_get(args, 'S');

  char      *cwd, *cause = NULL, **argv = NULL, *title;

  int      flags = 0, argc = 0;

  enum box_lines     lines = BOX_LINES_DEFAULT;

  u_int      px, py, w, h, count = args_count(args);

  struct args_value *av;

  struct environ    *env = NULL;

  struct options    *o = s->curw->window->options;

  struct options_entry  *oe;

  if (args_has(args, 'C')) {

    server_client_clear_overlay(tc);

    return (CMD_RETURN_NORMAL);

  }

  if (tc->overlay_draw != NULL)

    return (CMD_RETURN_NORMAL);

  h = tty->sy / 2;

  if (args_has(args, 'h')) {

    h = args_percentage(args, 'h', 1, tty->sy, tty->sy, &cause);

    if (cause != NULL) {

      cmdq_error(item, "height %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

  }

  w = tty->sx / 2;

  if (args_has(args, 'w')) {

    w = args_percentage(args, 'w', 1, tty->sx, tty->sx, &cause);

    if (cause != NULL) {

      cmdq_error(item, "width %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

  }

  if (w > tty->sx)

    w = tty->sx;

  if (h > tty->sy)

    h = tty->sy;

  if (!cmd_display_menu_get_position(tc, item, args, &px, &py, w, h))

    return (CMD_RETURN_NORMAL);

  value = args_get(args, 'b');

  if (args_has(args, 'B'))

    lines = BOX_LINES_NONE;

  else if (value != NULL) {

    oe = options_get(o, "popup-border-lines");

    lines = options_find_choice(options_table_entry(oe), value,

        &cause);

    if (cause != NULL) {

      cmdq_error(item, "popup-border-lines %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

  }

  value = args_get(args, 'd');

  if (value != NULL)

    cwd = format_single_from_target(item, value);

  else

    cwd = xstrdup(server_client_get_cwd(tc, s));

  if (count == 0)

    shellcmd = options_get_string(s->options, "default-command");

  else if (count == 1)

    shellcmd = args_string(args, 0);

  if (count <= 1 && (shellcmd == NULL || *shellcmd == '\0')) {

    shellcmd = NULL;

    shell = options_get_string(s->options, "default-shell");

    if (!checkshell(shell))

      shell = _PATH_BSHELL;

    cmd_append_argv(&argc, &argv, shell);

  } else

    args_to_vector(args, &argc, &argv);

  if (args_has(args, 'e') >= 1) {

    env = environ_create();

    av = args_first_value(args, 'e');

    while (av != NULL) {

      environ_put(env, av->string, 0);

      av = args_next_value(av);

    }

  }

  if (args_has(args, 'T'))

    title = format_single_from_target(item, args_get(args, 'T'));

  else

    title = xstrdup("");

  if (args_has(args, 'E') > 1)

    flags |= POPUP_CLOSEEXITZERO;

  else if (args_has(args, 'E'))

    flags |= POPUP_CLOSEEXIT;

  if (popup_display(flags, lines, item, px, py, w, h, env, shellcmd, argc,

      argv, cwd, title, tc, s, style, border_style, NULL, NULL) != 0) {

    cmd_free_argv(argc, argv);

    if (env != NULL)

      environ_free(env);

    free(cwd);

    free(title);

    return (CMD_RETURN_NORMAL);

  }

  if (env != NULL)

    environ_free(env);

  free(cwd);

  free(title);

  cmd_free_argv(argc, argv);

  return (CMD_RETURN_WAIT);

}