/* praat_actions.cpp
 *
 * Copyright (C) 1992-2018,2020-2024 Paul Boersma
 *
 * This code 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; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This code 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 work. If not, see <http://www.gnu.org/licenses/>.
 */

#include "praatP.h"
#include "praat_script.h"
#include "../kar/longchar.h"
#include "machine.h"
#include "GuiP.h"

#define BUTTON_LEFT  -240
#define BUTTON_RIGHT -5

static OrderedOf <structPraat_Command> theActions;
void praat_actions_exit_optimizeByLeaking () { theActions. _ownItems = false; }
static GuiMenu praat_writeMenu;
static GuiMenuItem praat_writeMenuSeparator;
static GuiForm praat_form;
static bool actionsInvisible = false;

static void fixSelectionSpecification (ClassInfo *class1, integer *n1, ClassInfo *class2, integer *n2, ClassInfo *class3, integer *n3) {
/*
	Function:
		sort the specification pairs *class(i), *n(i) according to class name, with null classes at the end.
	Postconditions:
		if (*class2) !! *class1;
		if (*class3) !! *class2;
		(*class1) -> className <= (*class2) -> className <= (*class3) -> className;
	Usage:
		Called by praat_addAction () and praat_removeAction ().
*/

	/*
		Fix unusual input bubblewise.
	*/
	if (! *class1 && *class2) {
		*class1 = *class2;
		*n1 = *n2;
		*class2 = nullptr;
		*n2 = 0;
	}
	if (! *class2 && *class3) {
		*class2 = *class3;
		*n2 = *n3;
		*class3 = nullptr;
		*n3 = 0;
		if (! *class1 && *class2) {
			*class1 = *class2;
			*n1 = *n2;
			*class2 = nullptr;
			*n2 = 0;
		}
	}

	/*
		Now: if *class3, then *class2, and if *class2, then *class1.
		Bubble-sort the input by class name.
	*/
	if (*class2 && str32cmp ((*class1) -> className, (*class2) -> className) > 0) {
		ClassInfo helpClass1 = *class1; *class1 = *class2; *class2 = helpClass1;
		integer helpN1 = *n1; *n1 = *n2; *n2 = helpN1;
	}
	if (*class3 && str32cmp ((*class2) -> className, (*class3) -> className) > 0) {
		ClassInfo helpClass2 = *class2; *class2 = *class3; *class3 = helpClass2;
		integer helpN2 = *n2; *n2 = *n3; *n3 = helpN2;
		if (str32cmp ((*class1) -> className, (*class2) -> className) > 0) {
			ClassInfo helpClass1 = *class1; *class1 = *class2; *class2 = helpClass1;
			integer helpN1 = *n1; *n1 = *n2; *n2 = helpN1;
		}
	}
}

static integer lookUpMatchingAction (ClassInfo class1, ClassInfo class2, ClassInfo class3, ClassInfo class4, conststring32 title) {
/*
	An action command is fully specified by its environment (the selected classes) and its title.
	Precondition:
		class1, class2, and class3 must be in sorted order.
*/
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		if (class1 == action -> class1 && class2 == action -> class2 &&
			class3 == action -> class3 && class4 == action -> class4 &&
			title && action -> title && str32equ (action -> title.get(), title)
		)
			return i;
	}
	return 0;   // not found
}

void praat_addAction1_ (ClassInfo class1, integer n1,
	conststring32 title, conststring32 after, uint32 flags, UiCallback callback, conststring32 nameOfCallback)
{ praat_addAction4_ (class1, n1, nullptr, 0, nullptr, 0, nullptr, 0, title, after, flags, callback, nameOfCallback); }

void praat_addAction2_ (ClassInfo class1, integer n1, ClassInfo class2, integer n2,
	conststring32 title, conststring32 after, uint32 flags, UiCallback callback, conststring32 nameOfCallback)
{ praat_addAction4_ (class1, n1, class2, n2, nullptr, 0, nullptr, 0, title, after, flags, callback, nameOfCallback); }

void praat_addAction3_ (ClassInfo class1, integer n1, ClassInfo class2, integer n2, ClassInfo class3, integer n3,
	conststring32 title, conststring32 after, uint32 flags, UiCallback callback, conststring32 nameOfCallback)
{ praat_addAction4_ (class1, n1, class2, n2, class3, n3, nullptr, 0, title, after, flags, callback, nameOfCallback); }

static void praat_addAction4__ (ClassInfo class1, integer n1, ClassInfo class2, integer n2, ClassInfo class3, integer n3, ClassInfo class4, integer n4,
	conststring32 title, conststring32 after, uint32 flags, UiCallback callback, conststring32 nameOfCallback)
{
	try {
		uint32 depth = flags, key = 0;
		bool unhidable = false, hidden = false, attractive = false;
		uint32 guiFlags = 0;
		if (flags > 7) {
			depth = ((flags & GuiMenu_DEPTH_7) >> 16);
			unhidable = (flags & GuiMenu_UNHIDABLE) != 0;
			hidden = (flags & GuiMenu_HIDDEN) != 0 && ! unhidable;
			key = flags & 0x000000FF;
			guiFlags = key ? flags & (0x000000FF | GuiMenu_SHIFT | GuiMenu_BUTTON_STATE_MASK) : flags & GuiMenu_BUTTON_STATE_MASK;
			attractive = (guiFlags & GuiMenu_ATTRACTIVE) != 0;
		}
		fixSelectionSpecification (& class1, & n1, & class2, & n2, & class3, & n3);

		if (callback && ! title)
			Melder_throw (U"An action command with callback has no title. Classes: ",
				class1 ? class1 -> className : U"", U" ",
				class2 ? class2 -> className : U"", U" ",
				class3 ? class3 -> className : U"", U" ",
				class4 ? class4 -> className : U"", U"."
			);

		if (! class1)
			Melder_throw (U"The action command \"", title, U"\" has no first class.");

		/*
			Determine the position of the new command.
		*/
		integer position;
		if (after) {   // search for existing command with same selection
			const integer found = lookUpMatchingAction (class1, class2, class3, class4, after);
			if (found == 0)
				Melder_throw (U"The action command \"", title, U"\" cannot be put after \"", after, U"\",\n"
					U"because the latter command does not exist.");
			position = found + 1;   // after 'after'
		} else {
			position = theActions.size + 1;   // at end
		}

		/*
			Make new command.
		*/
		autoPraat_Command action = Thing_new (Praat_Command);
		action -> class1 = class1;
		action -> n1 = n1;
		action -> class2 = class2;
		action -> n2 = n2;
		action -> class3 = class3;
		action -> n3 = n3;
		action -> class4 = class4;
		action -> n4 = n4;
		action -> title = Melder_dup_f (title);
		action -> depth = depth;
		action -> callback = callback;   // null for a separator
		action -> nameOfCallback = nameOfCallback;
		action -> button = nullptr;
		action -> script = autostring32();
		action -> hidden = hidden;
		action -> unhidable = unhidable;
		action -> attractive = attractive;

		/*
			Insert new command.
		*/
		theActions. addItemAtPosition_move (action.move(), position);
	} catch (MelderError) {
		Melder_flushError ();
	}
}
void praat_addAction4_ (ClassInfo class1, integer n1, ClassInfo class2, integer n2, ClassInfo class3, integer n3, ClassInfo class4, integer n4,
	conststring32 title, conststring32 after, uint32 flags, UiCallback callback, conststring32 nameOfCallback)
{
	const char32 *pSeparator = str32str (title, U" || ");
	if (! pSeparator)
		return praat_addAction4__ (class1, n1, class2, n2, class3, n3, class4, n4,
				title, after, flags, callback, nameOfCallback);
	if (flags < 8)
		flags *= GuiMenu_DEPTH_1;   // turn 1..7 into GuiMenu_DEPTH_1..GuiMenu_DEPTH_7, because the flags are ORed below
	integer positionOfSeparator = pSeparator - title;
	static MelderString string;
	MelderString_copy (& string, title);
	char32 *pTitle = & string.string [0];
	do {
		pTitle [positionOfSeparator] = U'\0';
		praat_addAction4__ (class1, n1, class2, n2, class3, n3, class4, n4,
				pTitle, after, flags, callback, nameOfCallback);
		pTitle += positionOfSeparator + 4;   // step past " || "
		pSeparator = str32str (pTitle, U" || ");
		if (pSeparator)
			positionOfSeparator = pSeparator - pTitle;
		flags |= GuiMenu_HIDDEN;
	} while (pSeparator);
	praat_addAction4__ (class1, n1, class2, n2, class3, n3, class4, n4,
			pTitle, after, flags | GuiMenu_HIDDEN, callback, nameOfCallback);
}

static void deleteDynamicMenu () {
	if (praatP.phase != praat_HANDLING_EVENTS)
		return;
	if (actionsInvisible)
		return;
	static integer numberOfDeletions;
	trace (U"deletion #", ++ numberOfDeletions);
	#if motif
		/*
			Undangle the menu items. They can be destroyed by the removal of their pull-down menu.
		*/
		for (integer i = 1; i <= theActions.size; i ++) {
			Praat_Command action = theActions.at [i];
			Melder_assert (action);
			Melder_assert (Thing_isa (action, classPraat_Command));
			if (action -> button) {
				Melder_assert (action -> button -> classInfo != classGuiMenu);
				if (action -> button -> classInfo == classGuiMenuItem)
					action -> button = nullptr;   // prevent destruction; the menu will take care of that
			}
		}
	#endif
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		Melder_assert (action);
		Melder_assert (Thing_isa (action, classPraat_Command));
		if (action -> button) {
			trace (U"trying to destroy action ", i, U" of ", theActions.size, U", button ", Melder_pointer (action -> button), U": ", action -> title.get());
			#if gtk || cocoa
				if (action -> button -> d_parent == praat_form) {
					trace (U"destroy a label or a push button or a cascade button");
					GuiObject_destroy (action -> button -> d_widget);
				} else if (praat_writeMenu && action -> button -> d_parent == praat_writeMenu) {
					trace (U"destroying Save menu item");
					GuiObject_destroy (action -> button -> d_widget);
				}
			#elif motif
				//trace ((int) * (char *) action -> button);   // try to access the memory
				Melder_assert (action -> button -> classInfo);
				//trace (2);
				if (action -> button -> classInfo == classGuiButton)
					Melder_assert (action -> button -> d_widget);
				//trace (3);
				if (action -> button -> classInfo == classGuiButton && action -> button -> d_widget -> subMenuId) {   // a cascade button (not a direct child of the form)?
					#define TRY_BARLESS  0
					#if TRY_BARLESS
					GuiObject_destroy (action -> button -> d_widget);
					GuiObject_destroy (action -> button -> d_widget -> subMenuId);
					#else
					/*
						We check that the parent is a RowColumn with exactly two children: a cascade button and a pulldown menu
					*/
					GuiObject xmMenuBarRowColumn = action -> button -> d_widget -> parent;
					Melder_assert (xmMenuBarRowColumn);
					trace (U"destroy the xm menu bar (widget class ", xmMenuBarRowColumn -> widgetClass, U"); this also destroys the xm button and the xm menu");
					Melder_assert (xmMenuBarRowColumn -> widgetClass == xmRowColumnWidgetClass);
					GuiObject xmCascadeButton = xmMenuBarRowColumn -> firstChild;
					Melder_assert (xmCascadeButton);
					Melder_assert (xmCascadeButton -> widgetClass == xmCascadeButtonWidgetClass);
					Melder_assert (xmCascadeButton == action -> button -> d_widget);
					GuiObject xmPulldownMenu = xmCascadeButton -> nextSibling;
					Melder_assert (xmPulldownMenu);
					Melder_assert (xmPulldownMenu -> widgetClass == xmPulldownMenuWidgetClass);
					Melder_assert (! xmPulldownMenu -> nextSibling);
					Melder_assert (xmCascadeButton -> subMenuId == xmPulldownMenu);
					/*
						Let's do some controlled destruction.
					*/
					//GuiObject_destroy (xmCascadeButton);   Melder_assert (xmMenuBarRowColumn -> firstChild == xmPulldownMenu);
					//GuiObject_destroy (xmPulldownMenu);    Melder_assert (xmMenuBarRowColumn -> firstChild == nullptr);
					GuiObject_destroy (xmMenuBarRowColumn);
					//GuiObject_destroy (action -> button -> d_widget);   // that would be only the cascade button
					#endif
				} else if (action -> button -> d_parent == praat_form) {
					GuiObject xmLabelOrButton = action -> button -> d_widget;
					Melder_assert (xmLabelOrButton);
					Melder_assert (xmLabelOrButton -> widgetClass == xmLabelWidgetClass || xmLabelOrButton -> widgetClass == xmPushButtonWidgetClass);
					trace (U"destroy a label or a push button");
					GuiObject_destroy (xmLabelOrButton);
				}
			#endif
			action -> button = nullptr;   // undangle
		}
	}
	if (praat_writeMenu) {
		#if gtk || cocoa
			if (praat_writeMenuSeparator) {
				trace (U"destroy the Save menu separator");
				GuiObject_destroy (praat_writeMenuSeparator -> d_widget);
			}
			//praat_writeMenu -> f_empty ();
		#elif motif
			GuiObject_destroy (praat_writeMenu -> d_xmMenuTitle);
			GuiObject_destroy (praat_writeMenu -> d_widget);
			praat_writeMenu = GuiMenu_createInWindow (praatP.menuBar, U"Save", 0);
		#endif
		praat_writeMenuSeparator = nullptr;   // undangle
	}
	actionsInvisible = true;
}

static void updateDynamicMenu () {
	if (praatP.phase != praat_HANDLING_EVENTS)
		return;
	praat_sortActions ();
	deleteDynamicMenu ();
	praat_show ();
}

void praat_addActionScript (conststring32 className1, integer n1, conststring32 className2, integer n2, conststring32 className3, integer n3,
	conststring32 title, conststring32 after, integer depth, conststring32 script)
{
	try {
		ClassInfo class1 = nullptr, class2 = nullptr, class3 = nullptr;
		Melder_assert (className1 && className2 && className3 && title && after && script);
		if (className1 [0] != U'\0')
			class1 = Thing_classFromClassName (className1, nullptr);
		if (className2 [0] != U'\0')
			class2 = Thing_classFromClassName (className2, nullptr);
		if (className3 [0] != U'\0')
			class3 = Thing_classFromClassName (className3, nullptr);
		fixSelectionSpecification (& class1, & n1, & class2, & n2, & class3, & n3);

		if (script [0] != U'\0' && title [0] == U'\0')
			Melder_throw (U"Command with callback has no title. Classes: ", className1, U" ", className2, U" ", className3, U".");

		if (className1 [0] == U'\0')
			Melder_throw (U"Command \"", title, U"\" has no first class.");

		/*
			If the button already exists, remove it.
		*/
		{// scope
			integer found = lookUpMatchingAction (class1, class2, class3, nullptr, title);
			if (found)
				theActions. removeItem (found);
		}

		/*
			Determine the position of the new command.
		*/
		integer position;
		if (after [0] != U'\0') {   // search for existing command with same selection
			integer found = lookUpMatchingAction (class1, class2, class3, nullptr, after);
			if (found)
				position = found + 1;   // after 'after'
			else
				position = theActions.size + 1;   // at end
		} else {
			position = theActions.size + 1;   // at end
		}

		/*
			Create new command.
		*/
		autoPraat_Command action = Thing_new (Praat_Command);
		action -> class1 = class1;
		action -> n1 = n1;
		action -> class2 = class2;
		action -> n2 = n2;
		action -> class3 = class3;
		action -> n3 = n3;
		action -> title = title [0] != U'\0' ? Melder_dup_f (title) : autostring32();   // allow old-fashioned untitled separators
		action -> depth = depth;
		action -> callback = ( script [0] != U'\0' ? DO_RunTheScriptFromAnyAddedMenuCommand : nullptr );   // null for a separator
		action -> button = nullptr;
		if (script [0] == U'\0') {
			action -> script = autostring32();
		} else {
			structMelderFile file { };
			Melder_relativePathToFile (script, & file);
			action -> script = Melder_dup_f (MelderFile_peekPath (& file));
		}
		action -> after = ( after [0] != U'\0' ? Melder_dup_f (after) : autostring32() );
		action -> phase = praatP.phase;
		if (praatP.phase >= praat_READING_BUTTONS) {
			static integer uniqueID = 0;
			action -> uniqueID = ++ uniqueID;
		}
		action -> added = true;

		/*
			Insert new command.
		*/
		theActions. addItemAtPosition_move (action.move(), position);
		updateDynamicMenu ();
	} catch (MelderError) {
		Melder_throw (U"Praat: script action not added.");
	}
}

void praat_removeAction (ClassInfo class1, ClassInfo class2, ClassInfo class3, conststring32 title) {
	try {
		integer n1, n2, n3;
		fixSelectionSpecification (& class1, & n1, & class2, & n2, & class3, & n3);
		integer found = lookUpMatchingAction (class1, class2, class3, nullptr, title);
		if (! found) {
			Melder_throw (U"Action command \"", class1 -> className,
				class2 ? U" & ": U"", class2 -> className,
				class3 ? U" & ": U"", class3 -> className,
				U": ", title, U"\" not found."
			);
		}
		theActions. removeItem (found);
	} catch (MelderError) {
		Melder_throw (U"Praat: action not removed.");
	}
}

void praat_removeAction_classNames (conststring32 className1, conststring32 className2,
	conststring32 className3, conststring32 title)
{
	try {
		ClassInfo class1 = nullptr, class2 = nullptr, class3 = nullptr;
		Melder_assert (className1 && className2 && className3 && title);
		if (className1 [0] != U'\0')
			class1 = Thing_classFromClassName (className1, nullptr);
		if (className2 [0] != U'\0')
			class2 = Thing_classFromClassName (className2, nullptr);
		if (className3 [0] != U'\0')
			class3 = Thing_classFromClassName (className3, nullptr);
		praat_removeAction (class1, class2, class3, title);
		updateDynamicMenu ();
	} catch (MelderError) {
		Melder_throw (U"Praat: action not removed.");
	}
}

void praat_hideAction (ClassInfo class1, ClassInfo class2, ClassInfo class3, conststring32 title) {
	try {
		integer n1, n2, n3;
		fixSelectionSpecification (& class1, & n1, & class2, & n2, & class3, & n3);
		integer found = lookUpMatchingAction (class1, class2, class3, nullptr, title);
		if (! found) {
			Melder_throw (U"Praat: action command \"", class1 ? class1 -> className : nullptr,
				class2 ? U" & ": nullptr, class2 ? class2 -> className : nullptr,
				class3 ? U" & ": nullptr, class3 ? class3 -> className : nullptr,
				U": ", title, U"\" not found."
			);
		}
		Praat_Command action = theActions.at [found];
		if (! action -> hidden) {
			action -> hidden = true;
			if (praatP.phase >= praat_READING_BUTTONS)
				action -> toggled = ! action -> toggled;
			updateDynamicMenu ();
		}
	} catch (MelderError) {
		Melder_throw (U"Praat: action not hidden.");
	}
}

void praat_hideAction_classNames (conststring32 className1, conststring32 className2,
	conststring32 className3, conststring32 title)
{
	try {
		ClassInfo class1 = nullptr, class2 = nullptr, class3 = nullptr;
		Melder_assert (className1 && className2 && className3 && title);
		if (className1 [0] != U'\0')
			class1 = Thing_classFromClassName (className1, nullptr);
		if (className2 [0] != U'\0')
			class2 = Thing_classFromClassName (className2, nullptr);
		if (className3 [0] != U'\0')
			class3 = Thing_classFromClassName (className3, nullptr);
		praat_hideAction (class1, class2, class3, title);
	} catch (MelderError) {
		Melder_throw (U"Praat: action not hidden.");
	}
}

void praat_showAction (ClassInfo class1, ClassInfo class2, ClassInfo class3, conststring32 title) {
	try {
		integer n1, n2, n3;
		fixSelectionSpecification (& class1, & n1, & class2, & n2, & class3, & n3);
		integer found = lookUpMatchingAction (class1, class2, class3, nullptr, title);
		if (! found) {
			Melder_throw (U"Action command \"", class1 ? class1 -> className : nullptr,
				class2 ? U" & ": nullptr, class2 ? class2 -> className : nullptr,
				class3 ? U" & ": nullptr, class3 ? class3 -> className : nullptr,
				U": ", title, U"\" not found."
			);
		}
		Praat_Command action = theActions.at [found];
		if (action -> hidden) {
			action -> hidden = false;
			if (praatP.phase >= praat_READING_BUTTONS)
				action -> toggled = ! action -> toggled;
			updateDynamicMenu ();
		}
	} catch (MelderError) {
		Melder_throw (U"Praat: action not shown.");
	}
}

void praat_showAction_classNames (conststring32 className1, conststring32 className2,
	conststring32 className3, conststring32 title)
{
	try {
		ClassInfo class1 = nullptr, class2 = nullptr, class3 = nullptr;
		Melder_assert (className1 && className2 && className3 && title);
		if (className1 [0] != U'\0')
			class1 = Thing_classFromClassName (className1, nullptr);
		if (className2 [0] != U'\0')
			class2 = Thing_classFromClassName (className2, nullptr);
		if (className3 [0] != U'\0')
			class3 = Thing_classFromClassName (className3, nullptr);
		praat_showAction (class1, class2, class3, title);
	} catch (MelderError) {
		Melder_throw (U"Praat: action not shown.");
	}
}

void praat_sortActions () {
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		action -> sortingTail = i;
	}
	std::sort (theActions.begin(), theActions.end(),
		[] (Praat_Command me, Praat_Command thee) {
			int compare = str32cmp (my class1 -> className, thy class1 -> className);
			if (compare != 0)
				return my class1 == classDaata ? true : thy class1 == classDaata ? false : ( compare < 0 );
			if (my class2) {
				if (! thy class2)
					return false;
				compare = str32cmp (my class2 -> className, thy class2 -> className);
				if (compare != 0)
					return compare < 0;
			} else if (thy class2)
				return true;
			if (my class3) {
				if (! thy class3)
					return false;
				compare = str32cmp (my class3 -> className, thy class3 -> className);
				if (compare != 0)
					return compare < 0;
			} else if (thy class3)
				return true;
			return my sortingTail < thy sortingTail;
		}
	);
}

static conststring32 numberString (integer number) {
	return number == 1 ? U"one" : number == 2 ? U"two" : number == 3 ? U"three" : U"any number of";
}
static conststring32 classString (ClassInfo klas) {
	return klas == classDaata ? U"" : klas -> className;
}
static conststring32 objectString (integer number) {
	return number == 1 ? U"object" : U"objects";
}
static bool allowExecutionHook (void *closure) {
	UiCallback callback = (UiCallback) closure;
	Melder_assert (sizeof (callback) == sizeof (void *));
	integer numberOfMatchingCallbacks = 0, firstMatchingCallback = 0;
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command me = theActions.at [i];
		if (my callback == callback) {
			integer sel1, sel2 = 0, sel3 = 0, sel4 = 0;
			if (! my class1)
				Melder_throw (U"No class1???");
			numberOfMatchingCallbacks += 1;
			if (firstMatchingCallback == 0)
				firstMatchingCallback = i;
			sel1 = ( my class1 == classDaata ? theCurrentPraatObjects -> totalSelection : praat_numberOfSelected (my class1) );
			if (sel1 == 0)
				continue;
			if (my class2 && (sel2 = praat_numberOfSelected (my class2)) == 0)
				continue;
			if (my class3 && (sel3 = praat_numberOfSelected (my class3)) == 0)
				continue;
			if (my class4 && (sel4 = praat_numberOfSelected (my class4)) == 0)
				continue;
			if (sel1 + sel2 + sel3 + sel4 != theCurrentPraatObjects -> totalSelection)
				continue;
			if ((my n1 && sel1 != my n1) || (my n2 && sel2 != my n2) || (my n3 && sel3 != my n3) || (my n4 && sel4 != my n4))
				continue;
			return true;   // found a matching action
		}
	}
	if (numberOfMatchingCallbacks == 1) {
		Praat_Command me = theActions.at [firstMatchingCallback];
		Melder_appendError (U"Selection changed! It should be:");
		if (my class1)
			Melder_appendError (U"   ", numberString (my n1), U" ", classString (my class1), U" ", objectString (my n1));
		if (my class2)
			Melder_appendError (U"   ", numberString (my n2), U" ", classString (my class2), U" ", objectString (my n2));
		if (my class3)
			Melder_appendError (U"   ", numberString (my n3), U" ", classString (my class3), U" ", objectString (my n3));
		if (my class4)
			Melder_appendError (U"   ", numberString (my n4), U" ", classString (my class4), U" ", objectString (my n4));
		throw MelderError ();
	} else {
		Melder_throw (U"Selection changed!");
	}
	return false;
}

static void do_menu (Praat_Command me, const bool isModified) {
	if (my callback == DO_RunTheScriptFromAnyAddedMenuCommand) {
		UiHistory_write (U"\nrunScript: ");
		try {
			DO_RunTheScriptFromAnyAddedMenuCommand (nullptr, 0, nullptr, my script.get(), nullptr, nullptr, false, nullptr, nullptr);
		} catch (MelderError) {
			Melder_flushError (U"Command \"", my title.get(), U"\" not executed.");
		}
		praat_updateSelection (); return;
	} else {
		if (my title && ! str32str (my title.get(), U"...")) {
			UiHistory_write (U"\n");
			UiHistory_write (my title.get());
		}
		Ui_setAllowExecutionHook (allowExecutionHook, (void *) my callback);   // BUG: one shouldn't assign a function pointer to a void pointer
		try {
			my callback (nullptr, 0, nullptr, nullptr, nullptr, my title.get(), isModified, nullptr, nullptr);
		} catch (MelderError) {
			Melder_flushError (U"Command \"", my title.get(), U"\" not executed.");
		}
		Ui_setAllowExecutionHook (nullptr, nullptr);
		praat_updateSelection (); return;
	}
}

static void cb_menu (Praat_Command me, GuiMenuItemEvent event) {
	const bool isModified = event -> shiftKeyPressed || event -> commandKeyPressed || event -> optionKeyPressed;
	do_menu (me, isModified);
}

static void gui_button_cb_menu (Praat_Command me, GuiButtonEvent event) {
	const bool isModified = event -> shiftKeyPressed || event -> commandKeyPressed || event -> optionKeyPressed;
	do_menu (me, isModified);
}

void praat_actions_show () {
	#if defined (macintosh)
		const int BUTTON_VSPACING = 8;
	#else
		const int BUTTON_VSPACING = 5;
	#endif
	/*
		The selection has changed;
		kill the dynamic menu and the write menu.
	*/
	if (! theCurrentPraatApplication -> batch) {
		deleteDynamicMenu ();
		if (! Melder_backgrounding) {
			GuiThing_setSensitive (praat_writeMenu, false);
			if (praat_writeMenuSeparator)
				GuiThing_hide (praat_writeMenuSeparator);
		}

		/*
			Determine the visibility and sensitivity of all the actions.
		*/
		if (theCurrentPraatObjects -> totalSelection != 0 && ! Melder_backgrounding)
			GuiThing_setSensitive (praat_writeMenu, true);
	}
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		integer sel1 = 0, sel2 = 0, sel3 = 0, sel4 = 0;
		const integer n1 = action -> n1, n2 = action -> n2, n3 = action -> n3, n4 = action -> n4;

		/*
			Clean up from previous selection.
		*/
		action -> visible = false;
		action -> executable = false;

		/*
			Match the actually selected classes with the selection required for this visibility.
		*/
		if (! action -> class1)
			continue;   // at least one class selected
		sel1 = ( action -> class1 == classDaata ? theCurrentPraatObjects -> totalSelection : praat_numberOfSelected (action -> class1) );
		if (sel1 == 0)
			continue;
		if (action -> class2 && (sel2 = praat_numberOfSelected (action -> class2)) == 0)
			continue;
		if (action -> class3 && (sel3 = praat_numberOfSelected (action -> class3)) == 0)
			continue;
		if (action -> class4 && (sel4 = praat_numberOfSelected (action -> class4)) == 0)
			continue;
		if (sel1 + sel2 + sel3 + sel4 != theCurrentPraatObjects -> totalSelection)
			continue;   // other classes selected? Do not show
		action -> visible = ! action -> hidden;

		/*
			Match the actually selected objects with the selection required for this action.
		*/
		if (! action -> callback)
			continue;   // separators are not executable
		if ((n1 && sel1 != n1) || (n2 && sel2 != n2) || (n3 && sel3 != n3) || (n4 && sel4 != n4))
			continue;
		action -> executable = true;
	}

	/*
		Create a new column of buttons in the dynamic menu.
	*/
	if (! theCurrentPraatApplication -> batch && ! Melder_backgrounding) {
		actionsInvisible = false;
		GuiMenu currentSubmenu1 = nullptr, currentSubmenu2 = nullptr;
		bool writeMenuGoingToSeparate = false;
		int y = Machine_getMenuBarBottom () + 10;
		for (integer i = 1; i <= theActions.size; i ++) {   // add buttons or make existing buttons sensitive (executable)
			Praat_Command me = theActions.at [i];
			if (my depth == 0) {
				currentSubmenu1 = nullptr;
				currentSubmenu2 = nullptr;   // prevent attachment of later deep actions to earlier submenus after removal of label
			}
			if (my depth == 1)
				currentSubmenu2 = nullptr;   // prevent attachment of later deep actions to earlier submenus after removal of label
			if (! my visible)
				continue;
			if (my callback) {
				/*
					Apparently a true command: create a button in the dynamic menu.
					If it is a subcommand (depth > 0), put it in the current submenu,
					but only if this exists (umbrella against stray submenu specifications).
				*/
				GuiMenu parentMenu = ( my depth > 1 && currentSubmenu2 ? currentSubmenu2 : my depth > 0 && currentSubmenu1 ? currentSubmenu1 : nullptr );

				if (str32nequ (my title.get(), U"Save ", 5) || str32nequ (my title.get(), U"Write ", 6) || str32nequ (my title.get(), U"Append to ", 10)) {
					parentMenu = praat_writeMenu;
					if (! praat_writeMenuSeparator) {
						if (writeMenuGoingToSeparate)
							praat_writeMenuSeparator = GuiMenu_addSeparator (parentMenu);
						else if (str32equ (my title.get(), U"Save as binary file..."))
							writeMenuGoingToSeparate = true;
					}
				}
				if (parentMenu) {
					my button = GuiMenu_addItem (parentMenu, my added ? Melder_cat (U"\u207A", my title.get()) : my title.get(),
						( my executable ? 0 : GuiMenu_INSENSITIVE ),
						cb_menu, me
					);
				} else {
					my button = GuiButton_createShown (praat_form,
						BUTTON_LEFT, BUTTON_RIGHT, y, y + Gui_PUSHBUTTON_HEIGHT,
						my added ? Melder_cat (U"\u207A", my title.get()) : my title.get(), gui_button_cb_menu,
						me, ( my executable ? 0 : GuiButton_INSENSITIVE ) | ( my attractive ? GuiButton_ATTRACTIVE : 0 )
					);
					y += Gui_PUSHBUTTON_HEIGHT + BUTTON_VSPACING;
				}
			} else if (i == theActions.size || theActions.at [i + 1] -> depth == 0) {
				/*
					Apparently a labelled separator.
				*/
				my button = GuiLabel_createShown (praat_form, BUTTON_LEFT, BUTTON_RIGHT, y, y + Gui_LABEL_HEIGHT, my added ? Melder_cat (U"\u207A", my title.get()) : my title.get(), 0);
				y += Gui_LABEL_HEIGHT + BUTTON_VSPACING;
			} else if (! my title || my title [0] == U'-') {
				/*
					Apparently a separator in a submenu.
				*/
				if (currentSubmenu2 || currentSubmenu1) {   // these separators are not shown in a flattened menu
					my button = GuiMenu_addSeparator (currentSubmenu2 ? currentSubmenu2 : currentSubmenu1);
					GuiThing_show (my button);
				}
			} else {
				/*
					Apparently a submenu.
				*/
				if (my depth == 0 || ! currentSubmenu1) {
					currentSubmenu1 = GuiMenu_createInForm (praat_form,
						BUTTON_LEFT, BUTTON_RIGHT, y, y + Gui_PUSHBUTTON_HEIGHT,
						my added ? Melder_cat (U"\u207A", my title.get()) : my title.get(), 0
					);
					y += Gui_PUSHBUTTON_HEIGHT + BUTTON_VSPACING;
					my button = currentSubmenu1 -> d_cascadeButton.get();
				} else {
					currentSubmenu2 = GuiMenu_createInMenu (currentSubmenu1, my added ? Melder_cat (U"\u207A", my title.get()) : my title.get(), 0);
					my button = currentSubmenu2 -> d_menuItem.get();
				}
				GuiThing_show (my button);
			}
		}
	}
}

void praat_actions_createWriteMenu (GuiWindow window) {
	if (theCurrentPraatApplication -> batch)
		return;
	praat_writeMenu = GuiMenu_createInWindow (window, U"Save", GuiMenu_INSENSITIVE);
	#if gtk
		GuiMenu_addSeparator (praat_writeMenu);
	#endif
}

void praat_actions_createDynamicMenu (GuiWindow window) {
	if (theCurrentPraatApplication -> batch)
		return;
	praat_form = window;
}

void praat_saveAddedActions (MelderString *buffer) {
	integer maxID = 0;
	for (integer iaction = 1; iaction <= theActions.size; iaction ++) {
		Praat_Command action = theActions.at [iaction];
		if (action -> uniqueID > maxID)
			maxID = action -> uniqueID;
	}
	for (integer ident = 1; ident <= maxID; ident ++)
		for (integer iaction = 1; iaction <= theActions.size; iaction ++) {
			Praat_Command me = theActions.at [iaction];
			if (my uniqueID == ident && ! my hidden && my title) {
				MelderString_append (buffer, U"Add action command...",
					U" ", my class1 -> className, U" ", my n1,
					U" ", ( my class2 ? my class2 -> className : U"\"\"" ), U" ", my n2,
					U" ", ( my class3 ? my class3 -> className : U"\"\"" ), U" ", my n3,
					U" \"", my title.get(), U"\" \"", ( my after ? my after.get() : U"" ), U"\" ", my depth);
				MelderString_append (buffer, U" ", my script ? my script.get() : U"", U"\n");
				break;
			}
		}
}

void praat_saveToggledActions (MelderString *buffer) {
	for (integer iaction = 1; iaction <= theActions.size; iaction ++) {
		Praat_Command me = theActions.at [iaction];
		if (my toggled && my title && ! my uniqueID && ! my script) {
			MelderString_append (buffer, ( my hidden ? U"Hide" : U"Show" ), U" action command...",
				U" ", my class1 -> className,
				U" ", ( my class2 ? my class2 -> className : U"\"\"" ),
				U" ", ( my class3 ? my class3 -> className : U"\"\"" ),
				U" ", my title.get(), U"\n"
			);
		}
	}
}

int praat_doAction (conststring32 title, conststring32 arguments, Interpreter interpreter) {
	Praat_Command actionFound = nullptr;
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		if (action -> executable && str32equ (action -> title.get(), title)) {
			actionFound = action;
			break;
		}
	}
	if (! actionFound)
		return 0;
	if (actionFound -> callback == DO_RunTheScriptFromAnyAddedMenuCommand) {
		const conststring32 scriptPath = actionFound -> script.get();
		const conststring32 preferencesFolderPath = MelderFolder_peekPath (Melder_preferencesFolder());
		const bool scriptIsInPlugin = Melder_startsWith (scriptPath, preferencesFolderPath);
		Melder_throw (
			U"From a script you cannot directly call a menu command that calls another script. Use instead: \nrunScript: ",
			scriptIsInPlugin ? U"preferencesDirectory$ + " : U"",
			U"\"",
			scriptIsInPlugin ? scriptPath + Melder_length (preferencesFolderPath) : scriptPath,
			U"\"",
			arguments && arguments [0] ? U", " : U"",
			arguments && arguments [0] ? arguments : U"",
			U"\n"
		);
	}
	actionFound -> callback (nullptr, 0, nullptr, arguments, interpreter, title, false, nullptr, nullptr);
	return 1;
}

int praat_doAction (conststring32 title, integer narg, Stackel args, Interpreter interpreter) {
	Praat_Command actionFound = nullptr;
	for (integer i = 1; i <= theActions.size; i ++) {
		Praat_Command action = theActions.at [i];
		if (action -> executable && str32equ (action -> title.get(), title)) {
			actionFound = action;
			break;
		}
	}
	if (! actionFound)
		return 0;
	if (actionFound -> callback == DO_RunTheScriptFromAnyAddedMenuCommand) {
		const conststring32 scriptPath = actionFound -> script.get();
		const conststring32 preferencesFolderPath = MelderFolder_peekPath (Melder_preferencesFolder());
		const bool scriptIsInPlugin = Melder_startsWith (scriptPath, preferencesFolderPath);
		Melder_throw (
			U"From a script you cannot directly call a menu command that calls another script. Use instead: \nrunScript: ",
			scriptIsInPlugin ? U"preferencesDirectory$ + " : U"",
			U"\"",
			scriptIsInPlugin ? scriptPath + Melder_length (preferencesFolderPath) : scriptPath,
			U"\"",
			narg > 0 ? U", ..." : U"",
			U"\n"
		);
	}
	actionFound -> callback (nullptr, narg, args, nullptr, interpreter, title, false, nullptr, nullptr);
	return 1;
}

integer praat_getNumberOfActions () { return theActions.size; }

Praat_Command praat_getAction (integer i)
	{ return i < 0 || i > theActions.size ? nullptr : theActions.at [i]; }

void praat_background () {
	if (Melder_batch)
		return;
	if (Melder_backgrounding)
		return;
	deleteDynamicMenu ();
	praat_list_background ();
	Melder_backgrounding = true;
}

void praat_foreground () {
	if (Melder_batch)
		return;
	if (! Melder_backgrounding)
		return;
	Melder_backgrounding = false;
	praat_list_foreground ();
	praat_show ();
}

static bool actionIsToBeIncluded (Praat_Command command, bool deprecated, bool includeSaveAPI,
	bool includeQueryAPI, bool includeModifyAPI, bool includeToAPI,
	bool includePlayAPI, bool includeDrawAPI, bool includeHelpAPI, bool includeWindowAPI)
{
	const bool obsolete = ( deprecated && (command -> deprecationYear < Melder_appYear() - 10 || command -> deprecationYear < 2017) );
	const bool hiddenByDefault = ( command -> hidden != command -> toggled );
	const bool explicitlyHidden = hiddenByDefault && ! deprecated;
	const bool hidden = explicitlyHidden || ! command -> callback || command -> noApi || obsolete ||
		(! includeWindowAPI && Melder_nequ (command -> nameOfCallback, U"WINDOW_", 7)) ||
		(! includeHelpAPI && Melder_nequ (command -> nameOfCallback, U"HELP_", 5)) ||
		(! includeDrawAPI && Melder_nequ (command -> nameOfCallback, U"GRAPHICS_", 9)) ||
		(! includePlayAPI && Melder_nequ (command -> nameOfCallback, U"PLAY_", 5)) ||
		(! includeToAPI && Melder_nequ (command -> nameOfCallback, U"CONVERT_", 8)) ||
		(! includeModifyAPI && Melder_nequ (command -> nameOfCallback, U"MODIFY_", 7)) ||
		(! includeQueryAPI && Melder_nequ (command -> nameOfCallback, U"QUERY_", 6)) ||
		(! includeSaveAPI && Melder_nequ (command -> nameOfCallback, U"SAVE_", 5));
	return (command -> forceApi || ! hidden) && command -> callback != DO_RunTheScriptFromAnyAddedMenuCommand;
}

static bool actionHasFileNameArgument (Praat_Command command) {
	const bool hasFileNameArgument =
		Melder_nequ (command -> nameOfCallback, U"READ1_", 6) ||
		Melder_nequ (command -> nameOfCallback, U"SAVE_", 5)
	;
	return hasFileNameArgument;
}

static conststring32 getReturnType (Praat_Command command) {
	const conststring32 returnType =
		Melder_nequ (command -> nameOfCallback, U"NEW1_", 5) ? U"PraatObject" :
		Melder_nequ (command -> nameOfCallback, U"READ1_", 6) ? U"PraatObject" :
		Melder_nequ (command -> nameOfCallback, U"REAL_", 5) ? U"double" :
		Melder_nequ (command -> nameOfCallback, U"INTEGER_", 8) ? U"int64_t" :
		Melder_nequ (command -> nameOfCallback, U"STRING_", 7) ? U"char *" :
		Melder_nequ (command -> nameOfCallback, U"REPORT_", 7) ? U"char *" :
		Melder_nequ (command -> nameOfCallback, U"LIST_", 5) ? U"char *" :
		Melder_nequ (command -> nameOfCallback, U"INFO_", 5) ? U"char *" :
		Melder_nequ (command -> nameOfCallback, U"HINT_", 5) ? U"char *" :
		U"void";
	return returnType;
}

void praat_actions_writeC (bool isInHeaderFile, bool includeSaveAPI,
	bool includeQueryAPI, bool includeModifyAPI, bool includeToAPI,
	bool includePlayAPI, bool includeDrawAPI, bool includeHelpAPI, bool includeWindowAPI)
{
	integer i = 1;
	try {
		integer numberOfApiActions = 0;
		for (; i <= theActions.size; i ++) {
			//Melder_casual (i, U": ", theActions.at [i] -> class1 -> className, U": ", theActions.at [i] -> title.get());
			Praat_Command command = theActions.at [i];
			const bool deprecated = ( command -> deprecationYear > 0 );
			if (! actionIsToBeIncluded (command, deprecated, includeSaveAPI, includeQueryAPI, includeModifyAPI,
				includeToAPI, includePlayAPI, includeDrawAPI, includeHelpAPI, includeWindowAPI)) continue;
			MelderInfo_writeLine (U"\n/* Action command \"", command -> title.get(), U"\"",
				deprecated ? U", deprecated " : U"", deprecated ? Melder_integer (command -> deprecationYear) : U"",
				U" */");
			conststring32 returnType = getReturnType (command);
			MelderInfo_writeLine (returnType, U" Praat", str32chr (command -> nameOfCallback, U'_'), U" (");
			const bool isDirect = ! str32str (command -> title.get(), U"...");
			if (isDirect) {
			} else {
				command -> callback (nullptr, -1, nullptr, nullptr, nullptr, nullptr, false, nullptr, nullptr);
			}
			if (actionHasFileNameArgument (command))
				MelderInfo_writeLine (U"\tconst char *fileName");
			MelderInfo_write (U")");
			if (isInHeaderFile) {
				MelderInfo_writeLine (U";");
			} else {
				MelderInfo_writeLine (U" {");
				MelderInfo_writeLine (U"}");
			}
			numberOfApiActions += 1;
		}
	} catch (MelderError) {
		Melder_throw (U"Action not written to C library: ", i,
			U": ", theActions.at [i] -> class1 ? theActions.at [i] -> class1 -> className : U"?? class ??",
			U": ", theActions.at [i] -> title.get()
		);
	}
}

/* End of file praat_actions.cpp */
