I need a simple electronic circuit that will help me accomplish what is depicted in the attached pic. This is for a more personal project but I know there is talent in this forum and I am no "wizzard" with electronics.

Basically when the switch is off I want the motor to turn in one direction indefinitely until and if it hits a stop at which point its Voltage would drop and its current would go sky high and then it shuts off (I'm guessing a current limiting or voltage drop cut off can be used)

When the switch is placed in the on position(12V) i want the motor to run in the opposite direction (reverse polarity) until and if it hits a stop at which point it shuts off again.

Any help is greatly appreciated.

Best regards,

Chris