public IntcodeProgramStatus RunProgram()
{
IntcodeProgramStatus status = IntcodeProgramStatus.Running;
while (true)
{
LogDebugMessage($"Pos: {_position.ToString("0000")}, Cmd: {_program[_position]}");
var parsedCommand = ParseCommand(_program[_position]);
var opcode = parsedCommand[0];
if (opcode == 1)
{
// Add param1 + param2, store in address pointed to by param3
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
var val3 = GetParameterWritePosition(_position + 3, 3, parsedCommand);
SetMemoryValue(val3, val1 + val2);
_position += 4;
}
else if (opcode == 2)
{
// Multiply param1 * param2, store in address pointed to by param3
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
var val3 = GetParameterWritePosition(_position + 3, 3, parsedCommand);
SetMemoryValue(val3, val1 * val2);
_position += 4;
}
else if (opcode == 3)
{
// Take user input, and store in the parameter location
// If the input provider doesn't have any input,
// then pause the program and return awaiting input status
if (!_inputProvider.HasInput())
{
status = IntcodeProgramStatus.AwaitingInput;
break;
}
BigInteger input = _inputProvider.GetInput();
var val1 = GetParameterWritePosition(_position + 1, 1, parsedCommand);
SetMemoryValue(val1, input);
_position += 2;
}
else if (opcode == 4)
{
// Output a value
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
_outputListener.SendOutput(val1);
_position += 2;
}
else if (opcode == 5)
{
// Opcode 5 is jump-if-true: if the first parameter is
// non-zero, it sets the instruction pointer to the value
// from the second parameter. Otherwise, it does nothing.
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
if (val1 != 0)
{
_position = GetMemoryAddress(val2);
}
else
{
_position += 3;
}
}
else if (opcode == 6)
{
// Opcode 6 is jump-if-false: if the first parameter is
// zero, it sets the instruction pointer to the value from
// the second parameter. Otherwise, it does nothing.
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
if (val1 == 0)
{
_position = GetMemoryAddress(val2);
}
else
{
_position += 3;
}
}
else if (opcode == 7)
{
// Opcode 7 is less than: if the first parameter is less
// than the second parameter, it stores 1 in the position
// given by the third parameter.
// Otherwise, it stores 0.
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
var val3 = GetParameterWritePosition(_position + 3, 3, parsedCommand);
var valToStore = val1 < val2 ? 1 : 0;
SetMemoryValue(val3, valToStore);
_position += 4;
}
else if (opcode == 8)
{
// Opcode 8 is equals: if the first parameter is equal to
// the second parameter, it stores 1 in the position given
// by the third parameter.
// Otherwise, it stores 0.
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
var val2 = GetParameterValue(_position + 2, 2, parsedCommand);
var val3 = GetParameterWritePosition(_position + 3, 3, parsedCommand);
var valToStore = val1 == val2 ? 1 : 0;
SetMemoryValue(val3, valToStore);
_position += 4;
}
else if (opcode == 9)
{
// Opcode 9 adjusts the relative base by the value of its
// only parameter. The relative base increases (or
// decreases, if the value is negative) by the value of the
// parameter.
// For example, if the relative base is 2000, then after
// the instruction 109,19, the relative base would be 2019.
// If the next instruction were 204,-34, then the value at
// address 1985 would be output.
var val1 = GetParameterValue(_position + 1, 1, parsedCommand);
_relativeBase += GetMemoryAddress(val1);
_position += 2;
}
else if (opcode == 99)
{
status = IntcodeProgramStatus.Completed;
break;
}
else if (opcode != 99)
{
throw new Exception($"Invalid opcode {_program[_position]} at position {_position}");
}
}
return(status);
}
