/*
 * Copyright 2005 Richard Wilson <info@tinct.net>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 * RISC OS option setting (implementation).
 */

#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <oslib/os.h>
#include <oslib/osbyte.h>
#include <oslib/territory.h>
#include <oslib/wimp.h>

#include "utils/log.h"
#include "utils/messages.h"

#include "riscos/gui.h"
#include "riscos/dialog.h"
#include "riscos/configure.h"
#include "riscos/wimp.h"
#include "riscos/wimp_event.h"
#include "riscos/configure/configure.h"

#define CONFIGURE_ICON_PADDING_H 32
#define CONFIGURE_ICON_PADDING_V 32
#define CONFIGURE_DEFAULT_ICON_WIDTH (68 + CONFIGURE_ICON_PADDING_H)
#define CONFIGURE_DEFAULT_ICON_HEIGHT (128 + CONFIGURE_ICON_PADDING_V)

struct configure_tool {
	const char *name;
#define CONFIGURE_TOOL_TRANSLATED_SIZE 64
	char translated[CONFIGURE_TOOL_TRANSLATED_SIZE];
	char *validation;
	bool (*initialise)(wimp_w w);
	void (*finalise)(wimp_w w);
	wimp_w w;
	wimp_i i;
	bool open;
	struct configure_tool *next;
};

static wimp_w configure_window;
static int configure_current_encoding;
static int configure_icons = 0;
static struct configure_tool *configure_tools = NULL;
static int configure_icon_width = CONFIGURE_DEFAULT_ICON_WIDTH;
static int configure_icon_height = CONFIGURE_DEFAULT_ICON_HEIGHT;
static int configure_icons_per_line = 0;
static int configure_width;
static int configure_height;

static bool ro_gui_configure_click(wimp_pointer *pointer);
static void ro_gui_configure_open_window(wimp_open *open);
static void ro_gui_configure_close(wimp_w w);
static bool ro_gui_configure_translate(void);
static void ro_gui_configure_register(const char *window,
		bool (*initialise)(wimp_w w), void (*finalise)(wimp_w w));

void ro_gui_configure_initialise(void)
{
	/* create our window */
	configure_window = ro_gui_dialog_create("configure");
	ro_gui_wimp_event_register_open_window(configure_window,
			ro_gui_configure_open_window);
	ro_gui_wimp_event_register_mouse_click(configure_window,
			ro_gui_configure_click);
	ro_gui_wimp_event_set_help_prefix(configure_window, "HelpConfigure");

	/* add in our option windows */
	ro_gui_configure_register("con_cache",
			ro_gui_options_cache_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_connect",
			ro_gui_options_connection_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_content",
			ro_gui_options_content_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_fonts",
			ro_gui_options_fonts_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_home",
			ro_gui_options_home_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_image",
			ro_gui_options_image_initialise,
			ro_gui_options_image_finalise);
	ro_gui_configure_register("con_inter",
			ro_gui_options_interface_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_lang",
			ro_gui_options_language_initialise,
			ro_gui_wimp_event_finalise);
	ro_gui_configure_register("con_theme",
			ro_gui_options_theme_initialise,
			ro_gui_options_theme_finalise);
	ro_gui_configure_register("con_secure",
			ro_gui_options_security_initialise,
			ro_gui_wimp_event_finalise);

	/* translate the icons */
	if (!ro_gui_configure_translate())
		die("ro_gui_configure_translate failed");
}

void ro_gui_configure_show(void)
{
	int width, height;

	width = configure_icon_width << 2;
	height = ((configure_icons + 3) >> 2) * configure_icon_height;
	ro_gui_dialog_open_top(configure_window, NULL, width, height);
}

bool ro_gui_configure_click(wimp_pointer *pointer)
{
	struct configure_tool *tool;

	if (pointer->buttons == wimp_CLICK_MENU)
		return true;

	for (tool = configure_tools; tool; tool = tool->next) {
		if (tool->i == pointer->i) {
			if (!tool->open) {
				tool->open = true;
				if (!tool->initialise(tool->w))
					return false;
				ro_gui_dialog_open_persistent(
						configure_window,
						tool->w, true);
				ro_gui_wimp_event_register_close_window(
						tool->w,
						ro_gui_configure_close);
			} else {
				ro_gui_dialog_open_top(tool->w, NULL, 0, 0);
			}
			break;
		}
	}
	return true;
}

void ro_gui_configure_close(wimp_w w)
{
	struct configure_tool *tool;

	for (tool = configure_tools; tool; tool = tool->next) {
		if (tool->w == w) {
			tool->open = false;
			if (tool->finalise)
				tool->finalise(w);
			break;
		}
	}
}

void ro_gui_configure_open_window(wimp_open *open)
{
	os_error *error;
	int screen_width, screen_height;
	int height, width;
	int icons_per_line, icon_lines;
	int max_height;
	os_box extent = { 0, 0, 0, 0 };
	struct configure_tool *tool;

	if (!ro_gui_configure_translate()) {
		ro_warn_user("ro_gui_configure_translate failed", 0);
		return;
	}

	width = open->visible.x1 - open->visible.x0;
	height = open->visible.y1 - open->visible.y0;
	icons_per_line = width / configure_icon_width;
	if (icons_per_line < 1)
		icons_per_line = 1;

	/* move our icons */
	if (icons_per_line != configure_icons_per_line) {
		int x, y, l;
		configure_icons_per_line = icons_per_line;
		x = CONFIGURE_ICON_PADDING_H / 2;
		y = -configure_icon_height + (CONFIGURE_ICON_PADDING_V / 2);
		l = 0;
		for (tool = configure_tools; tool; tool = tool->next) {
			error = xwimp_resize_icon(configure_window,
				tool->i,
				x,
				y,
				x + configure_icon_width -
						CONFIGURE_ICON_PADDING_H,
				y + configure_icon_height -
						CONFIGURE_ICON_PADDING_V);
			if (error) {
				LOG("xwimp_resize_icon: 0x%x: %s", error->errnum, error->errmess);
			}
			x += configure_icon_width;
			l++;
			if (l >= icons_per_line) {
				x = CONFIGURE_ICON_PADDING_H / 2;
				l = 0;
				y -= configure_icon_height;
                        }
		}
		error = xwimp_force_redraw(configure_window,
				0, -16384, 16384, 0);
		if (error) {
			LOG("xwimp_force_redraw: 0x%x: %s", error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
		}
	}

	/* restrict our height */
	icon_lines = (configure_icons + icons_per_line - 1) /
			icons_per_line;
	max_height = (icon_lines * configure_icon_height);
	if (height > max_height)
		open->visible.y0 = open->visible.y1 - max_height;

	/* set the extent */
	if ((configure_height != height) || (configure_width != width)) {
		int max_icons_per_line;
		ro_gui_screen_size(&screen_width, &screen_height);
		max_icons_per_line = screen_width / configure_icon_width;
		if (max_icons_per_line > configure_icons)
			max_icons_per_line = configure_icons;
		extent.x1 = configure_icon_width * max_icons_per_line;
		extent.y0 = -max_height;
		error = xwimp_set_extent(open->w, &extent);
		if (error) {
			LOG("xwimp_set_extent: 0x%x: %s", error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return;
		}
		configure_height = height;
		configure_width = width;
	}

	/* open the window */
	error = xwimp_open_window(open);
	if (error) {
		LOG("xwimp_open_window: 0x%x: %s", error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}
}

void ro_gui_configure_register(const char *window,
		bool (*initialise)(wimp_w w), void (*finalise)(wimp_w w))
{
	wimp_icon_create new_icon;
	struct configure_tool *tool;
	struct configure_tool *link;
	os_error *error;

	/* create our tool */
	tool = calloc(sizeof(struct configure_tool), 1);
	if (!tool) {
		LOG("Insufficient memory for calloc()");
		die("Insufficient memory");
		return; /* For the benefit of scan-build */
	}
	tool->name = window;
	tool->translated[0] = '\0';
	tool->validation = malloc(strlen(window) + 2);
	if (!tool->validation) {
		LOG("Insufficient memory for malloc()");
		die("Insufficient memory");
	}
	sprintf(tool->validation, "S%s", window);
	tool->initialise = initialise;
	tool->finalise = finalise;
	tool->w = ro_gui_dialog_create(tool->name);

	/* create the icon */
	new_icon.w = configure_window;
	new_icon.icon.extent.x0 = 0;
	new_icon.icon.extent.x1 = configure_icon_width;
	new_icon.icon.extent.y1 = 0;
	new_icon.icon.extent.y0 = -configure_icon_height;
	new_icon.icon.flags = wimp_ICON_TEXT | wimp_ICON_SPRITE |
			wimp_ICON_INDIRECTED | wimp_ICON_HCENTRED |
			(wimp_COLOUR_VERY_LIGHT_GREY << wimp_ICON_BG_COLOUR_SHIFT) |
			(wimp_COLOUR_BLACK << wimp_ICON_FG_COLOUR_SHIFT) |
			(wimp_BUTTON_CLICK << wimp_ICON_BUTTON_TYPE_SHIFT);
	new_icon.icon.data.indirected_text_and_sprite.text =
			tool->translated;
	new_icon.icon.data.indirected_text_and_sprite.validation =
			tool->validation;
	new_icon.icon.data.indirected_text_and_sprite.size =
			CONFIGURE_TOOL_TRANSLATED_SIZE;
	error = xwimp_create_icon(&new_icon, &tool->i);
	if (error) {
		LOG("xwimp_create_icon: 0x%x: %s", error->errnum, error->errmess);
		die(error->errmess);
	}

	/* Set the icon's text in current local encoding */
	ro_gui_set_icon_string(configure_window, tool->i,
			messages_get(tool->name), true);

	/* link into our list alphabetically */
	if ((!configure_tools) ||
			(strcmp(configure_tools->translated,
					tool->translated) > 0)) {
		tool->next = configure_tools;
		configure_tools = tool;
	} else {
		for (link = configure_tools; link; link = link->next) {
			if (link->next) {
				if (strcmp(link->next->translated,
						tool->translated) > 0) {
					tool->next = link->next;
					link->next = tool;
					break;
				}
			} else {
				link->next = tool;
				break;
			}
		}
	}
	configure_icons++;
}

/**
 * Translate tool icons into the system local encoding.
 * This will also recalculate the minimum required icon width.
 *
 * \return true on success, false on memory exhaustion
 */
bool ro_gui_configure_translate(void)
{
	int alphabet;
	struct configure_tool *tool;
	int icon_width;
	os_error *error;

	/* read current alphabet */
	error = xosbyte1(osbyte_ALPHABET_NUMBER, 127, 0,
			&alphabet);
	if (error) {
		LOG("failed reading alphabet: 0x%x: %s", error->errnum, error->errmess);
		/* assume Latin1 */
		alphabet = territory_ALPHABET_LATIN1;
	}

	if (alphabet == configure_current_encoding)
		/* text is already in the correct encoding */
		return true;

	/* reset icon width */
	configure_icon_width = CONFIGURE_DEFAULT_ICON_WIDTH;

	for (tool = configure_tools; tool; tool = tool->next) {
		/* re-translate the text */
		ro_gui_set_icon_string(configure_window, tool->i,
				messages_get(tool->name), true);

		/* update the width */
		error = xwimptextop_string_width(tool->translated,
				strlen(tool->translated), &icon_width);
		if (error) {
			LOG("xwimptextop_string_width: 0x%x: %s", error->errnum, error->errmess);
			return false;
		}
		icon_width += CONFIGURE_ICON_PADDING_H;
		if (icon_width > configure_icon_width)
			configure_icon_width = icon_width;

		error = xwimp_resize_icon(configure_window,
				tool->i,
				0,
				-configure_icon_height,
				configure_icon_width,
				0);
		if (error) {
			LOG("xwimp_resize_icon: 0x%x: %s", error->errnum, error->errmess);
		}
	}

	/* invalidate our global icons_per_line setting
	 * so the icons get reflowed */
	configure_icons_per_line = 0;

	/* finally, set the current encoding */
	configure_current_encoding = alphabet;

	return true;
}
