#include "edit_history.h"

EditHistory *EditHistory::singleton_instance{ nullptr };

void EditHistory::_bind_methods() {
	ClassDB::bind_method(D_METHOD("push_action", "do_action", "undo_action"), &self_type::push_action);
	ClassDB::bind_method(D_METHOD("undo_last"), &self_type::undo);
	ClassDB::bind_method(D_METHOD("redo_last"), &self_type::redo);
}

void EditHistory::push_action(Callable do_action, Callable undo_action) {
	if (this->undo_count != 0) {
		this->history.resize(this->history.size() - this->undo_count);
		this->undo_count = 0;
	}
	do_action.call();
	this->history.push_back({ do_action, undo_action });
}

void EditHistory::undo() {
	if (this->undo_count < this->history.size()) {
		this->undo_count++;
		this->history[this->history.size() - this->undo_count].undo_action.call();
	}
}

void EditHistory::redo() {
	if (this->undo_count > 0) {
		this->history[this->history.size() - this->undo_count].do_action.call();
		this->undo_count--;
	}
}