/* $OpenBSD$ */

/*
 * Copyright (c) 2007 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_more_init(struct window_pane *);
void	window_more_free(struct window_pane *);
void	window_more_resize(struct window_pane *, u_int, u_int);
void	window_more_key(struct window_pane *, struct client *, int);

void	window_more_redraw_screen(struct window_pane *);
void	window_more_write_line(
	    struct window_pane *, struct screen_write_ctx *, u_int);

void	window_more_scroll_up(struct window_pane *);
void	window_more_scroll_down(struct window_pane *);

const struct window_mode window_more_mode = {
	window_more_init,
	window_more_free,
	window_more_resize,
	window_more_key,
	NULL,
	NULL,
};

struct window_more_mode_data {
	struct screen	        screen;

	struct mode_key_data	mdata;

	ARRAY_DECL(, char *)	list;
	u_int			top;
};

void
window_more_vadd(struct window_pane *wp, const char *fmt, va_list ap)
{
	struct window_more_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx	 	 ctx;
	char   				*msg;
	u_int				 size;

	xvasprintf(&msg, fmt, ap);
	ARRAY_ADD(&data->list, msg);

	screen_write_start(&ctx, wp, NULL);
	size = ARRAY_LENGTH(&data->list) - 1;
	if (size >= data->top && size <= data->top + screen_size_y(s) - 1) {
		window_more_write_line(wp, &ctx, size - data->top);
		if (size != data->top)
			window_more_write_line(wp, &ctx, 0);
	} else
		window_more_write_line(wp, &ctx, 0);
	screen_write_stop(&ctx);
}

struct screen *
window_more_init(struct window_pane *wp)
{
	struct window_more_mode_data	*data;
	struct screen			*s;
	int				 keys;

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

	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_more_free(struct window_pane *wp)
{
	struct window_more_mode_data	*data = wp->modedata;
	u_int				 i;

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

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

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

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

/* ARGSUSED */
void
window_more_key(struct window_pane *wp, unused struct client *c, int key)
{
	struct window_more_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	switch (mode_key_lookup(&data->mdata, key)) {
	case MODEKEYCHOICE_CANCEL:
		window_pane_reset_mode(wp);
		break;
	case MODEKEYCHOICE_UP:
	case MODEKEYCHOICE_SCROLLUP:
		window_more_scroll_up(wp);
		break;
	case MODEKEYCHOICE_DOWN:
	case MODEKEYCHOICE_SCROLLDOWN:
		window_more_scroll_down(wp);
		break;
	case MODEKEYCHOICE_PAGEUP:
		if (data->top < screen_size_y(s))
			data->top = 0;
		else
			data->top -= screen_size_y(s);
		window_more_redraw_screen(wp);
		break;
	case MODEKEYCHOICE_PAGEDOWN:
		if (data->top + screen_size_y(s) > ARRAY_LENGTH(&data->list))
			data->top = ARRAY_LENGTH(&data->list);
		else
			data->top += screen_size_y(s);
		window_more_redraw_screen(wp);
		break;
	default:
		break;
	}
}

void
window_more_write_line(
    struct window_pane *wp, struct screen_write_ctx *ctx, u_int py)
{
	struct window_more_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct options			*oo = &wp->window->options;
	struct grid_cell		 gc;
	char   				*msg, hdr[32];
	size_t	 			 size;
	int				 utf8flag;

	utf8flag = options_get_number(&wp->window->options, "utf8");
	memcpy(&gc, &grid_default_cell, sizeof gc);

	if (py == 0) {
		size = xsnprintf(hdr, sizeof hdr,
		    "[%u/%u]", data->top, ARRAY_LENGTH(&data->list));
		screen_write_cursormove(ctx, screen_size_x(s) - size, 0);
		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_puts(ctx, &gc, "%s", hdr);
		memcpy(&gc, &grid_default_cell, sizeof gc);
	} else
		size = 0;

	screen_write_cursormove(ctx, 0, py);
	if (data->top + py  < ARRAY_LENGTH(&data->list)) {
		msg = ARRAY_ITEM(&data->list, data->top + py);
		screen_write_nputs(
		    ctx, screen_size_x(s) - size, &gc, utf8flag, "%s", msg);
	}
	while (s->cx < screen_size_x(s) - size)
		screen_write_putc(ctx, &gc, ' ');
}

void
window_more_redraw_screen(struct window_pane *wp)
{
	struct window_more_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_more_write_line(wp, &ctx, i);
	screen_write_stop(&ctx);
}

void
window_more_scroll_up(struct window_pane *wp)
{
	struct window_more_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_more_write_line(wp, &ctx, 0);
	window_more_write_line(wp, &ctx, 1);
	screen_write_stop(&ctx);
}

void
window_more_scroll_down(struct window_pane *wp)
{
	struct window_more_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_more_write_line(wp, &ctx, screen_size_y(s) - 1);
	window_more_write_line(wp, &ctx, 0);
	screen_write_stop(&ctx);
}