/*

 * Copyright (C) 2008 Nir Tzachar <nir.tzachar@gmail.com?

 * Released under the terms of the GNU GPL v2.0.

 *

 * Derived from menuconfig.

 *

 */

#include "nconf.h"

/* a list of all the different widgets we use */

attributes_t attributes[ATTR_MAX+1] = {0};

/* available colors:

   COLOR_BLACK   0

   COLOR_RED     1

   COLOR_GREEN   2

   COLOR_YELLOW  3

   COLOR_BLUE    4

   COLOR_MAGENTA 5

   COLOR_CYAN    6

   COLOR_WHITE   7

   */

static void set_normal_colors(void)

{

	init_pair(NORMAL, -1, -1);

	init_pair(MAIN_HEADING, COLOR_MAGENTA, -1);

	/* FORE is for the selected item */

	init_pair(MAIN_MENU_FORE, -1, -1);

	/* BACK for all the rest */

	init_pair(MAIN_MENU_BACK, -1, -1);

	init_pair(MAIN_MENU_GREY, -1, -1);

	init_pair(MAIN_MENU_HEADING, COLOR_GREEN, -1);

	init_pair(MAIN_MENU_BOX, COLOR_YELLOW, -1);

	init_pair(SCROLLWIN_TEXT, -1, -1);

	init_pair(SCROLLWIN_HEADING, COLOR_GREEN, -1);

	init_pair(SCROLLWIN_BOX, COLOR_YELLOW, -1);

	init_pair(DIALOG_TEXT, -1, -1);

	init_pair(DIALOG_BOX, COLOR_YELLOW, -1);

	init_pair(DIALOG_MENU_BACK, COLOR_YELLOW, -1);

	init_pair(DIALOG_MENU_FORE, COLOR_RED, -1);

	init_pair(INPUT_BOX, COLOR_YELLOW, -1);

	init_pair(INPUT_HEADING, COLOR_GREEN, -1);

	init_pair(INPUT_TEXT, -1, -1);

	init_pair(INPUT_FIELD, -1, -1);

	init_pair(FUNCTION_HIGHLIGHT, -1, -1);

	init_pair(FUNCTION_TEXT, COLOR_BLUE, -1);

}

/* available attributes:

   A_NORMAL        Normal display (no highlight)

   A_STANDOUT      Best highlighting mode of the terminal.

   A_UNDERLINE     Underlining

   A_REVERSE       Reverse video

   A_BLINK         Blinking

   A_DIM           Half bright

   A_BOLD          Extra bright or bold

   A_PROTECT       Protected mode

   A_INVIS         Invisible or blank mode

   A_ALTCHARSET    Alternate character set

   A_CHARTEXT      Bit-mask to extract a character

   COLOR_PAIR(n)   Color-pair number n

   */

static void normal_color_theme(void)

{

	/* automatically add color... */

#define mkattr(name, attr) do { \

attributes[name] = attr | COLOR_PAIR(name); } while (0)

	mkattr(NORMAL, NORMAL);

	mkattr(MAIN_HEADING, A_BOLD | A_UNDERLINE);

	mkattr(MAIN_MENU_FORE, A_REVERSE);

	mkattr(MAIN_MENU_BACK, A_NORMAL);

	mkattr(MAIN_MENU_GREY, A_NORMAL);

	mkattr(MAIN_MENU_HEADING, A_BOLD);

	mkattr(MAIN_MENU_BOX, A_NORMAL);

	mkattr(SCROLLWIN_TEXT, A_NORMAL);

	mkattr(SCROLLWIN_HEADING, A_BOLD);

	mkattr(SCROLLWIN_BOX, A_BOLD);

	mkattr(DIALOG_TEXT, A_BOLD);

	mkattr(DIALOG_BOX, A_BOLD);

	mkattr(DIALOG_MENU_FORE, A_STANDOUT);

	mkattr(DIALOG_MENU_BACK, A_NORMAL);

	mkattr(INPUT_BOX, A_NORMAL);

	mkattr(INPUT_HEADING, A_BOLD);

	mkattr(INPUT_TEXT, A_NORMAL);

	mkattr(INPUT_FIELD, A_UNDERLINE);

	mkattr(FUNCTION_HIGHLIGHT, A_BOLD);

	mkattr(FUNCTION_TEXT, A_REVERSE);

}

static void no_colors_theme(void)

{

	/* automatically add highlight, no color */

#define mkattrn(name, attr) { attributes[name] = attr; }

	mkattrn(NORMAL, NORMAL);

	mkattrn(MAIN_HEADING, A_BOLD | A_UNDERLINE);

	mkattrn(MAIN_MENU_FORE, A_STANDOUT);

	mkattrn(MAIN_MENU_BACK, A_NORMAL);

	mkattrn(MAIN_MENU_GREY, A_NORMAL);

	mkattrn(MAIN_MENU_HEADING, A_BOLD);

	mkattrn(MAIN_MENU_BOX, A_NORMAL);

	mkattrn(SCROLLWIN_TEXT, A_NORMAL);

	mkattrn(SCROLLWIN_HEADING, A_BOLD);

	mkattrn(SCROLLWIN_BOX, A_BOLD);

	mkattrn(DIALOG_TEXT, A_NORMAL);

	mkattrn(DIALOG_BOX, A_BOLD);

	mkattrn(DIALOG_MENU_FORE, A_STANDOUT);

	mkattrn(DIALOG_MENU_BACK, A_NORMAL);

	mkattrn(INPUT_BOX, A_BOLD);

	mkattrn(INPUT_HEADING, A_BOLD);

	mkattrn(INPUT_TEXT, A_NORMAL);

	mkattrn(INPUT_FIELD, A_UNDERLINE);

	mkattrn(FUNCTION_HIGHLIGHT, A_BOLD);

	mkattrn(FUNCTION_TEXT, A_REVERSE);

}

void set_colors()

{

	start_color();

	use_default_colors();

	set_normal_colors();

	if (has_colors()) {

		normal_color_theme();

	} else {

		/* give defaults */

		no_colors_theme();

	}

}

/* this changes the windows attributes !!! */

void print_in_middle(WINDOW *win,

		int starty,

		int startx,

		int width,

		const char *string,

		chtype color)

{      int length, x, y;

	float temp;

	if (win == NULL)

		win = stdscr;

	getyx(win, y, x);

	if (startx != 0)

		x = startx;

	if (starty != 0)

		y = starty;

	if (width == 0)

		width = 80;

	length = strlen(string);

	temp = (width - length) / 2;

	x = startx + (int)temp;

	(void) wattrset(win, color);

	mvwprintw(win, y, x, "%s", string);

	refresh();

}

int get_line_no(const char *text)

{

	int i;

	int total = 1;

	if (!text)

		return 0;

	for (i = 0; text[i] != '\0'; i++)

		if (text[i] == '\n')

			total++;

	return total;

}

const char *get_line(const char *text, int line_no)

{

	int i;

	int lines = 0;

	if (!text)

		return 0;

	for (i = 0; text[i] != '\0' && lines < line_no; i++)

		if (text[i] == '\n')

			lines++;

	return text+i;

}

int get_line_length(const char *line)

{

	int res = 0;

	while (*line != '\0' && *line != '\n') {

		line++;

		res++;

	}

	return res;

}

/* print all lines to the window. */

void fill_window(WINDOW *win, const char *text)

{

	int x, y;

	int total_lines = get_line_no(text);

	int i;

	getmaxyx(win, y, x);

	/* do not go over end of line */

	total_lines = min(total_lines, y);

	for (i = 0; i < total_lines; i++) {

		char tmp[x+10];

		const char *line = get_line(text, i);

		int len = get_line_length(line);

		strncpy(tmp, line, min(len, x));

		tmp[len] = '\0';

		mvwprintw(win, i, 0, "%s", tmp);

	}

}

/* get the message, and buttons.

 * each button must be a char*

 * return the selected button

 *

 * this dialog is used for 2 different things:

 * 1) show a text box, no buttons.

 * 2) show a dialog, with horizontal buttons

 */

int btn_dialog(WINDOW *main_window, const char *msg, int btn_num, ...)

{

	va_list ap;

	char *btn;

	int btns_width = 0;

	int msg_lines = 0;

	int msg_width = 0;

	int total_width;

	int win_rows = 0;

	WINDOW *win;

	WINDOW *msg_win;

	WINDOW *menu_win;

	MENU *menu;

	ITEM *btns[btn_num+1];

	int i, x, y;

	int res = -1;

	va_start(ap, btn_num);

	for (i = 0; i < btn_num; i++) {

		btn = va_arg(ap, char *);

		btns[i] = new_item(btn, "");

		btns_width += strlen(btn)+1;

	}

	va_end(ap);

	btns[btn_num] = NULL;

	/* find the widest line of msg: */

	msg_lines = get_line_no(msg);

	for (i = 0; i < msg_lines; i++) {

		const char *line = get_line(msg, i);

		int len = get_line_length(line);

		if (msg_width < len)

			msg_width = len;

	}

	total_width = max(msg_width, btns_width);

	/* place dialog in middle of screen */

	y = (LINES-(msg_lines+4))/2;

	x = (COLS-(total_width+4))/2;

	/* create the windows */

	if (btn_num > 0)

		win_rows = msg_lines+4;

	else

		win_rows = msg_lines+2;

	win = newwin(win_rows, total_width+4, y, x);

	keypad(win, TRUE);

	menu_win = derwin(win, 1, btns_width, win_rows-2,

			1+(total_width+2-btns_width)/2);

	menu = new_menu(btns);

	msg_win = derwin(win, win_rows-2, msg_width, 1,

			1+(total_width+2-msg_width)/2);

	set_menu_fore(menu, attributes[DIALOG_MENU_FORE]);

	set_menu_back(menu, attributes[DIALOG_MENU_BACK]);

	(void) wattrset(win, attributes[DIALOG_BOX]);

	box(win, 0, 0);

	/* print message */

	(void) wattrset(msg_win, attributes[DIALOG_TEXT]);

	fill_window(msg_win, msg);

	set_menu_win(menu, win);

	set_menu_sub(menu, menu_win);

	set_menu_format(menu, 1, btn_num);

	menu_opts_off(menu, O_SHOWDESC);

	menu_opts_off(menu, O_SHOWMATCH);

	menu_opts_on(menu, O_ONEVALUE);

	menu_opts_on(menu, O_NONCYCLIC);

	set_menu_mark(menu, "");

	post_menu(menu);

	touchwin(win);

	refresh_all_windows(main_window);

	while ((res = wgetch(win))) {

		switch (res) {

		case KEY_LEFT:

			menu_driver(menu, REQ_LEFT_ITEM);

			break;

		case KEY_RIGHT:

			menu_driver(menu, REQ_RIGHT_ITEM);

			break;

		case 10: /* ENTER */

		case 27: /* ESCAPE */

		case ' ':

		case KEY_F(F_BACK):

		case KEY_F(F_EXIT):

			break;

		}

		touchwin(win);

		refresh_all_windows(main_window);

		if (res == 10 || res == ' ') {

			res = item_index(current_item(menu));

			break;

		} else if (res == 27 || res == KEY_F(F_BACK) ||

				res == KEY_F(F_EXIT)) {

			res = KEY_EXIT;

			break;

		}

	}

	unpost_menu(menu);

	free_menu(menu);

	for (i = 0; i < btn_num; i++)

		free_item(btns[i]);

	delwin(win);

	return res;

}

int dialog_inputbox(WINDOW *main_window,

		const char *title, const char *prompt,

		const char *init, char *result, int result_len)

{

	int prompt_lines = 0;

	int prompt_width = 0;

	WINDOW *win;

	WINDOW *prompt_win;

	WINDOW *form_win;

	PANEL *panel;

	int i, x, y;

	int res = -1;

	int cursor_position = strlen(init);

	/* find the widest line of msg: */

	prompt_lines = get_line_no(prompt);

	for (i = 0; i < prompt_lines; i++) {

		const char *line = get_line(prompt, i);

		int len = get_line_length(line);

		prompt_width = max(prompt_width, len);

	}

	if (title)

		prompt_width = max(prompt_width, strlen(title));

	/* place dialog in middle of screen */

	y = (LINES-(prompt_lines+4))/2;

	x = (COLS-(prompt_width+4))/2;

	strncpy(result, init, result_len);

	/* create the windows */

	win = newwin(prompt_lines+6, prompt_width+7, y, x);

	prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);

	form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);

	keypad(form_win, TRUE);

	(void) wattrset(form_win, attributes[INPUT_FIELD]);

	(void) wattrset(win, attributes[INPUT_BOX]);

	box(win, 0, 0);

	(void) wattrset(win, attributes[INPUT_HEADING]);

	if (title)

		mvwprintw(win, 0, 3, "%s", title);

	/* print message */

	(void) wattrset(prompt_win, attributes[INPUT_TEXT]);

	fill_window(prompt_win, prompt);

	mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");

	mvwprintw(form_win, 0, 0, "%s", result);

	/* create panels */

	panel = new_panel(win);

	/* show the cursor */

	curs_set(1);

	touchwin(win);

	refresh_all_windows(main_window);

	while ((res = wgetch(form_win))) {

		int len = strlen(result);

		switch (res) {

		case 10: /* ENTER */

		case 27: /* ESCAPE */

		case KEY_F(F_HELP):

		case KEY_F(F_EXIT):

		case KEY_F(F_BACK):

			break;

		case 127:

		case KEY_BACKSPACE:

			if (cursor_position > 0) {

				memmove(&result[cursor_position-1],

						&result[cursor_position],

						len-cursor_position+1);

				cursor_position--;

			}

			break;

		case KEY_DC:

			if (cursor_position >= 0 && cursor_position < len) {

				memmove(&result[cursor_position],

						&result[cursor_position+1],

						len-cursor_position+1);

			}

			break;

		case KEY_UP:

		case KEY_RIGHT:

			if (cursor_position < len &&

			    cursor_position < min(result_len, prompt_width))

				cursor_position++;

			break;

		case KEY_DOWN:

		case KEY_LEFT:

			if (cursor_position > 0)

				cursor_position--;

			break;

		default:

			if ((isgraph(res) || isspace(res)) &&

					len-2 < result_len) {

				/* insert the char at the proper position */

				memmove(&result[cursor_position+1],

						&result[cursor_position],

						len+1);

				result[cursor_position] = res;

				cursor_position++;

			} else {

				mvprintw(0, 0, "unknow key: %d\n", res);

			}

			break;

		}

		wmove(form_win, 0, 0);

		wclrtoeol(form_win);

		mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");

		mvwprintw(form_win, 0, 0, "%s", result);

		wmove(form_win, 0, cursor_position);

		touchwin(win);

		refresh_all_windows(main_window);

		if (res == 10) {

			res = 0;

			break;

		} else if (res == 27 || res == KEY_F(F_BACK) ||

				res == KEY_F(F_EXIT)) {

			res = KEY_EXIT;

			break;

		} else if (res == KEY_F(F_HELP)) {

			res = 1;

			break;

		}

	}

	/* hide the cursor */

	curs_set(0);

	del_panel(panel);

	delwin(prompt_win);

	delwin(form_win);

	delwin(win);

	return res;

}

/* refresh all windows in the correct order */

void refresh_all_windows(WINDOW *main_window)

{

	update_panels();

	touchwin(main_window);

	refresh();

}

/* layman's scrollable window... */

void show_scroll_win(WINDOW *main_window,

		const char *title,

		const char *text)

{

	int res;

	int total_lines = get_line_no(text);

	int x, y;

	int start_x = 0, start_y = 0;

	int text_lines = 0, text_cols = 0;

	int total_cols = 0;

	int win_cols = 0;

	int win_lines = 0;

	int i = 0;

	WINDOW *win;

	WINDOW *pad;

	PANEL *panel;

	/* find the widest line of msg: */

	total_lines = get_line_no(text);

	for (i = 0; i < total_lines; i++) {

		const char *line = get_line(text, i);

		int len = get_line_length(line);

		total_cols = max(total_cols, len+2);

	}

	/* create the pad */

	pad = newpad(total_lines+10, total_cols+10);

	(void) wattrset(pad, attributes[SCROLLWIN_TEXT]);

	fill_window(pad, text);

	win_lines = min(total_lines+4, LINES-2);

	win_cols = min(total_cols+2, COLS-2);

	text_lines = max(win_lines-4, 0);

	text_cols = max(win_cols-2, 0);

	/* place window in middle of screen */

	y = (LINES-win_lines)/2;

	x = (COLS-win_cols)/2;

	win = newwin(win_lines, win_cols, y, x);

	keypad(win, TRUE);

	/* show the help in the help window, and show the help panel */

	(void) wattrset(win, attributes[SCROLLWIN_BOX]);

	box(win, 0, 0);

	(void) wattrset(win, attributes[SCROLLWIN_HEADING]);

	mvwprintw(win, 0, 3, " %s ", title);

	panel = new_panel(win);

	/* handle scrolling */

	do {

		copywin(pad, win, start_y, start_x, 2, 2, text_lines,

				text_cols, 0);

		print_in_middle(win,

				text_lines+2,

				0,

				text_cols,

				"<OK>",

				attributes[DIALOG_MENU_FORE]);

		wrefresh(win);

		res = wgetch(win);

		switch (res) {

		case KEY_NPAGE:

		case ' ':

			start_y += text_lines-2;

			break;

		case KEY_PPAGE:

			start_y -= text_lines+2;

			break;

		case KEY_HOME:

			start_y = 0;

			break;

		case KEY_END:

			start_y = total_lines-text_lines;

			break;

		case KEY_DOWN:

		case 'j':

			start_y++;

			break;

		case KEY_UP:

		case 'k':

			start_y--;

			break;

		case KEY_LEFT:

		case 'h':

			start_x--;

			break;

		case KEY_RIGHT:

		case 'l':

			start_x++;

			break;

		}

		if (res == 10 || res == 27 || res == 'q'

		    || res == KEY_F(F_BACK) || res == KEY_F(F_EXIT)) {

			break;

		}

		if (start_y < 0)

			start_y = 0;

		if (start_y >= total_lines-text_lines)

			start_y = total_lines-text_lines;

		if (start_x < 0)

			start_x = 0;

		if (start_x >= total_cols-text_cols)

			start_x = total_cols-text_cols;

	} while (res);

	del_panel(panel);

	delwin(win);

	refresh_all_windows(main_window);

}