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/* $Id: window-choose.c,v 1.30 2010/05/22 21:56:04 micahcowan Exp $ */

/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <string.h>

#include "tmux.h"

struct screen *window_choose_init(struct window_pane *);
void window_choose_free(struct window_pane *);
void window_choose_resize(struct window_pane *, u_int, u_int);
void window_choose_key(struct window_pane *, struct session *, int);
void window_choose_mouse(
struct window_pane *, struct session *, struct mouse_event *);

void window_choose_redraw_screen(struct window_pane *);
void window_choose_write_line(
struct window_pane *, struct screen_write_ctx *, u_int);

void window_choose_scroll_up(struct window_pane *);
void window_choose_scroll_down(struct window_pane *);

const struct window_mode window_choose_mode = {
window_choose_init,
window_choose_free,
window_choose_resize,
window_choose_key,
window_choose_mouse,
NULL,
};

struct window_choose_mode_item {
char *name;
int idx;
};

struct window_choose_mode_data {
struct screen screen;

struct mode_key_data mdata;

ARRAY_DECL(, struct window_choose_mode_item) list;
u_int top;
u_int selected;

void (*callbackfn)(void *, int);
void (*freefn)(void *);
void *data;
};

int window_choose_key_index(struct window_choose_mode_data *, u_int);
int window_choose_index_key(struct window_choose_mode_data *, int);

void
window_choose_vadd(struct window_pane *wp, int idx, const char *fmt, va_list ap)
{
struct window_choose_mode_data *data = wp->modedata;
struct window_choose_mode_item *item;

ARRAY_EXPAND(&data->list, 1);
item = &ARRAY_LAST(&data->list);
xvasprintf(&item->name, fmt, ap);
item->idx = idx;
}

void printflike3
window_choose_add(struct window_pane *wp, int idx, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
window_choose_vadd(wp, idx, fmt, ap);
va_end(ap);
}

void
window_choose_ready(struct window_pane *wp, u_int cur,
    void (*callbackfn)(void *, int), void (*freefn)(void *), void *cdata)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;

data->selected = cur;
if (data->selected > screen_size_y(s) - 1)
data->top = ARRAY_LENGTH(&data->list) - screen_size_y(s);

data->callbackfn = callbackfn;
data->freefn = freefn;
data->data = cdata;

window_choose_redraw_screen(wp);
}

struct screen *
window_choose_init(struct window_pane *wp)
{
struct window_choose_mode_data *data;
struct screen *s;
int keys;

wp->modedata = data = xmalloc(sizeof *data);

data->callbackfn = NULL;
data->freefn = NULL;
data->data = NULL;

ARRAY_INIT(&data->list);
data->top = 0;

s = &data->screen;
screen_init(s, screen_size_x(&wp->base), screen_size_y(&wp->base), 0);
s->mode &= ~MODE_CURSOR;
if (options_get_number(&wp->window->options, "mode-mouse"))
s->mode |= MODE_MOUSE;

keys = options_get_number(&wp->window->options, "mode-keys");
if (keys == MODEKEY_EMACS)
mode_key_init(&data->mdata, &mode_key_tree_emacs_choice);
else
mode_key_init(&data->mdata, &mode_key_tree_vi_choice);

return (s);
}

void
window_choose_free(struct window_pane *wp)
{
struct window_choose_mode_data *data = wp->modedata;
u_int i;

if (data->freefn != NULL && data->data != NULL)
data->freefn(data->data);

for (i = 0; i < ARRAY_LENGTH(&data->list); i++)
xfree(ARRAY_ITEM(&data->list, i).name);
ARRAY_FREE(&data->list);

screen_free(&data->screen);
xfree(data);
}

void
window_choose_resize(struct window_pane *wp, u_int sx, u_int sy)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;

data->top = 0;
if (data->selected > sy - 1)
data->top = data->selected - (sy - 1);

screen_resize(s, sx, sy);
window_choose_redraw_screen(wp);
}

/* ARGSUSED */
void
window_choose_key(struct window_pane *wp, unused struct session *sess, int key)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;
struct screen_write_ctx ctx;
struct window_choose_mode_item *item;
u_int items;
int idx;

items = ARRAY_LENGTH(&data->list);

switch (mode_key_lookup(&data->mdata, key)) {
case MODEKEYCHOICE_CANCEL:
data->callbackfn(data->data, -1);
window_pane_reset_mode(wp);
break;
case MODEKEYCHOICE_CHOOSE:
item = &ARRAY_ITEM(&data->list, data->selected);
data->callbackfn(data->data, item->idx);
window_pane_reset_mode(wp);
break;
case MODEKEYCHOICE_UP:
if (items == 0)
break;
if (data->selected == 0) {
data->selected = items - 1;
if (data->selected > screen_size_y(s) - 1)
data->top = items - screen_size_y(s);
window_choose_redraw_screen(wp);
break;
}
data->selected--;
if (data->selected < data->top)
window_choose_scroll_up(wp);
else {
screen_write_start(&ctx, wp, NULL);
window_choose_write_line(
wp, &ctx, data->selected - data->top);
window_choose_write_line(
wp, &ctx, data->selected + 1 - data->top);
screen_write_stop(&ctx);
}
break;
case MODEKEYCHOICE_DOWN:
if (items == 0)
break;
if (data->selected == items - 1) {
data->selected = 0;
data->top = 0;
window_choose_redraw_screen(wp);
break;
}
data->selected++;

if (data->selected < data->top + screen_size_y(s)) {
screen_write_start(&ctx, wp, NULL);
window_choose_write_line(
wp, &ctx, data->selected - data->top);
window_choose_write_line(
wp, &ctx, data->selected - 1 - data->top);
screen_write_stop(&ctx);
} else
window_choose_scroll_down(wp);
break;
case MODEKEYCHOICE_SCROLLUP:
if (items == 0 || data->top == 0)
break;
if (data->selected == data->top + screen_size_y(s) - 1) {
data->selected--;
window_choose_scroll_up(wp);
screen_write_start(&ctx, wp, NULL);
window_choose_write_line(
wp, &ctx, screen_size_y(s) - 1);
screen_write_stop(&ctx);
} else
window_choose_scroll_up(wp);
break;
case MODEKEYCHOICE_SCROLLDOWN:
if (items == 0 ||
data->top + screen_size_y(&data->screen) >= items)
break;
if (data->selected == data->top) {
data->selected++;
window_choose_scroll_down(wp);
screen_write_start(&ctx, wp, NULL);
window_choose_write_line(wp, &ctx, 0);
screen_write_stop(&ctx);
} else
window_choose_scroll_down(wp);
break;
case MODEKEYCHOICE_PAGEUP:
if (data->selected < screen_size_y(s)) {
data->selected = 0;
data->top = 0;
} else {
data->selected -= screen_size_y(s);
if (data->top < screen_size_y(s))
data->top = 0;
else
data->top -= screen_size_y(s);
}
window_choose_redraw_screen(wp);
break;
case MODEKEYCHOICE_PAGEDOWN:
data->selected += screen_size_y(s);
if (data->selected > items - 1)
data->selected = items - 1;
data->top += screen_size_y(s);
if (screen_size_y(s) < items) {
if (data->top + screen_size_y(s) > items)
data->top = items - screen_size_y(s);
} else
data->top = 0;
if (data->selected < data->top)
data->top = data->selected;
window_choose_redraw_screen(wp);
break;
default:
idx = window_choose_index_key(data, key);
if (idx < 0 || (u_int) idx >= ARRAY_LENGTH(&data->list))
break;
data->selected = idx;

item = &ARRAY_ITEM(&data->list, data->selected);
data->callbackfn(data->data, item->idx);
window_pane_reset_mode(wp);
break;
}
}

/* ARGSUSED */
void
window_choose_mouse(
    struct window_pane *wp, unused struct session *sess, struct mouse_event *m)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;
struct window_choose_mode_item *item;
u_int idx;

if ((m->b & 3) == 3)
return;
if (m->x >= screen_size_x(s))
return;
if (m->y >= screen_size_y(s))
return;

idx = data->top + m->y;
if (idx >= ARRAY_LENGTH(&data->list))
return;
data->selected = idx;

item = &ARRAY_ITEM(&data->list, data->selected);
data->callbackfn(data->data, item->idx);
window_pane_reset_mode(wp);
}

void
window_choose_write_line(
    struct window_pane *wp, struct screen_write_ctx *ctx, u_int py)
{
struct window_choose_mode_data *data = wp->modedata;
struct window_choose_mode_item *item;
struct options *oo = &wp->window->options;
struct screen *s = &data->screen;
struct grid_cell gc;
int utf8flag, key;

if (data->callbackfn == NULL)
fatalx("called before callback assigned");

utf8flag = options_get_number(&wp->window->options, "utf8");
memcpy(&gc, &grid_default_cell, sizeof gc);
if (data->selected == data->top + py) {
colour_set_fg(&gc, options_get_number(oo, "mode-fg"));
colour_set_bg(&gc, options_get_number(oo, "mode-bg"));
gc.attr |= options_get_number(oo, "mode-attr");
}

screen_write_cursormove(ctx, 0, py);
if (data->top + py < ARRAY_LENGTH(&data->list)) {
item = &ARRAY_ITEM(&data->list, data->top + py);
key = window_choose_key_index(data, data->top + py);
if (key != -1) {
screen_write_nputs(ctx, screen_size_x(s) - 1,
&gc, utf8flag, "(%c) %s", key, item->name);
} else {
screen_write_nputs(ctx, screen_size_x(s) - 1,
&gc, utf8flag, " %s", item->name);
}

}
while (s->cx < screen_size_x(s))
screen_write_putc(ctx, &gc, ' ');
}

int
window_choose_key_index(struct window_choose_mode_data *data, u_int idx)
{
static const char keys[] = "0123456789abcdefghijklmnopqrstuvwxyz";
const char *ptr;
int mkey;

for (ptr = keys; *ptr != '\0'; ptr++) {
mkey = mode_key_lookup(&data->mdata, *ptr);
if (mkey != MODEKEY_NONE && mkey != MODEKEY_OTHER)
continue;
if (idx-- == 0)
return (*ptr);
}
return (-1);
}

int
window_choose_index_key(struct window_choose_mode_data *data, int key)
{
static const char keys[] = "0123456789abcdefghijklmnopqrstuvwxyz";
const char *ptr;
int mkey;
u_int idx = 0;

for (ptr = keys; *ptr != '\0'; ptr++) {
mkey = mode_key_lookup(&data->mdata, *ptr);
if (mkey != MODEKEY_NONE && mkey != MODEKEY_OTHER)
continue;
if (key == *ptr)
return (idx);
idx++;
}
return (-1);
}

void
window_choose_redraw_screen(struct window_pane *wp)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;
struct screen_write_ctx ctx;
u_int i;

screen_write_start(&ctx, wp, NULL);
for (i = 0; i < screen_size_y(s); i++)
window_choose_write_line(wp, &ctx, i);
screen_write_stop(&ctx);
}

void
window_choose_scroll_up(struct window_pane *wp)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen_write_ctx ctx;

if (data->top == 0)
return;
data->top--;

screen_write_start(&ctx, wp, NULL);
screen_write_cursormove(&ctx, 0, 0);
screen_write_insertline(&ctx, 1);
window_choose_write_line(wp, &ctx, 0);
if (screen_size_y(&data->screen) > 1)
window_choose_write_line(wp, &ctx, 1);
screen_write_stop(&ctx);
}

void
window_choose_scroll_down(struct window_pane *wp)
{
struct window_choose_mode_data *data = wp->modedata;
struct screen *s = &data->screen;
struct screen_write_ctx ctx;

if (data->top >= ARRAY_LENGTH(&data->list))
return;
data->top++;

screen_write_start(&ctx, wp, NULL);
screen_write_cursormove(&ctx, 0, 0);
screen_write_deleteline(&ctx, 1);
window_choose_write_line(wp, &ctx, screen_size_y(s) - 1);
if (screen_size_y(&data->screen) > 1)
window_choose_write_line(wp, &ctx, screen_size_y(s) - 2);
screen_write_stop(&ctx);
}
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