package foundation.io.define;

public enum IODirection {

	SheetToTable(IOLocation.Sheet, IOLocation.Table),
	TableToSheet(IOLocation.Table, IOLocation.Sheet),
	TableToTable(IOLocation.Table, IOLocation.Table),
	SheetToMemory(IOLocation.Sheet, IOLocation.Memory),
	ErrorsToSheet(IOLocation.Errors, IOLocation.Sheet);
	
	private IOLocation from;
	private IOLocation to;
	
	public static IODirection parse(String value) {
		if (value == null) {
			return null;
		}
		
		value = value.toLowerCase();
		
		int pos = value.indexOf("-->");
		
		if (pos <= 0) {
			return null;
		}
		
		String from = value.substring(0, pos).trim();
		String to = value.substring(pos + 3).trim();
		
		IOLocation from_location = IOLocation.parse(from);
		IOLocation to_location = IOLocation.parse(to);
		
		if (IOLocation.Sheet == from_location && IOLocation.Table == to_location) {
			return SheetToTable;
		}
		else if (IOLocation.Sheet == from_location && IOLocation.Memory == to_location) {
			return SheetToMemory;
		}
		else if (IOLocation.Table == from_location && IOLocation.Sheet == to_location) {
			return TableToSheet;
		}
		else if (IOLocation.Errors == from_location && IOLocation.Sheet == to_location) {
			return ErrorsToSheet;
		}
		else if (IOLocation.Table == from_location && IOLocation.Table == to_location) {
			return TableToTable;
		}
		
		return null;
	}
	
	private IODirection(IOLocation from, IOLocation to) {
		this.from = from;
		this.to = to;
	}

	public IOLocation getFrom() {
		return from;
	}

	public IOLocation getTo() {
		return to;
	}

}