/*
**		popup.cb:
**
**		Implements the pop-up menu interface.
*/

#include "dialog.h"
#include "win_ctrl.h"

void popup_menu (int kb_flags, int mse_y, int mse_x);
int process_popup_menu (string buf_name, string file_name, ~int height, ~int width, ~int, ~int);
int process_popup_event (int event, ...);

string	_popup_la,			// Last action invoked from a pop-up menu
			_popup_mn;			// Last menu displayed in a pop-up menu

int		_popup_level,		// Number of nested menus we've displayed
			_popup_flag,		// Non-zero if there's an action to be taken
			_popup_x,			// Position of top-level popup menu
			_popup_y;

extern string search_path (string path, string filename);

_init ()
{
	if (!inq_macro ("_remove_dialog_manager"))
		load_macro ("dialog");
}

/*
**		popup_menu:
**
**		Implements the popup menu interface for BRIEF.
*/

void popup_menu (int kb_flags, int ~, int ~)
{
	int	mse_y, mse_x;

	if (get_parm (1, mse_y) == 0)
		mse_y = -1;

	if (get_parm (2, mse_x) == 0)
		mse_x = -1;

	_popup_flag = FALSE;		// Reset action flag (maybe use _popup_la?)

	if (kb_flags & KB_ALT)
	{
		if (_popup_mn != "")
		{
			string buf_name, menu_name;

			buf_name = substr (_popup_mn, 1, index (_popup_mn, "\xff") - 1);
			menu_name = substr (_popup_mn, index (_popup_mn, "\xff") + 1);
			process_popup_menu (buf_name, menu_name, NULL, NULL, mse_y, mse_x);
		}
	}
	else if (kb_flags & KB_CTRL)
		_popup_flag = TRUE;
	else
		process_popup_menu ("Pop-up Menu", "popup.mnu", NULL, NULL, mse_y, mse_x);

	if (_popup_flag)
	{
		set_calling_name ("");
		execute_macro (_popup_la);
	}
}

int process_popup_menu (string buf_name, string file_name, ~int height, ~int width, ~int y, ~int x)
{
	/*
	**		First, determine the actual width and height of the specified menu.
	**	Then, compute the new X,Y based on the width and height of the menu.
	*/

	if (!search_string ("[:/\\\\]", file_name, NULL, TRUE))
		file_name = search_path (_dialog_dir, file_name);

	if (exist (file_name))
	{
		int		menu_buf_id, curr_buf,
					screen_y, screen_x,
					buf_is_loaded,
					by;

		/*
		**		Save the last menu viewed.
		*/

		_popup_mn = buf_name + "\xff" + file_name;

		buf_is_loaded = inq_buffer (file_name);

		menu_buf_id = create_buffer (buf_name, file_name, TRUE);
		curr_buf = set_buffer (menu_buf_id);

		/*
		**		Calculate the width and height of the menu and where to put it.
		*/

		top_of_buffer ();

		if (search_fwd (";", FALSE))
			inq_position (NULL, width);

		if (width < 14)
			width = 14;

		end_of_buffer ();
		inq_position (height);
		top_of_buffer ();

		inq_screen_size (screen_y, screen_x);

		if (_popup_level == 0)
		{
			if (y == -1)// || get_parm (4, y) == 0)
				y = (screen_y / 2) - (height / 2);

			if (x == -1)// || get_parm (5, x) == 0)
				x = (screen_x / 2) - (width / 2);
		}
		else
		{
			y = _popup_y + _popup_level;
			x = _popup_x + _popup_level * 2;
		}

		screen_y -= 4;
		screen_x -= 3;

		if (screen_y < (y + height + 1))
			y = screen_y - height;

		if (y < 2) y = 2;

		if (screen_x < (x + width))
			x = screen_x - width;

		if (_popup_level == 0)
		{
			_popup_x = x;
			_popup_y = y;
		}

		set_buffer (curr_buf);

		_popup_level++;

		by = y + height + 1;

		if (by > screen_y + 1)
			by = screen_y + 1;

		_process_menu (x, by, x + width, y, buf_name,
							"Select an Item", NULL, menu_buf_id,
							"process_popup_event", TRUE);

		_popup_level--;

		if (!buf_is_loaded)
			delete_buffer (menu_buf_id);

		returns (TRUE);
	}
	else
		returns (FALSE);
}

int process_popup_event (int event, ...)
{
	if (event == DIALOG_PICK_MENU)
	{
		string action;

		get_parm (2, action);

		action = substr (action, index (action, ";") + 1);

		if (index (action, "process_popup_menu"))
			execute_macro (action);
		else
		{
			_popup_la = action;
			_popup_flag = TRUE;
			push_back (key_to_int ("<Esc>"));
		}
	}

	returns (TRUE);
}