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let (action, value) = input.split_at(1); + let value = value + .parse() + .map_err(|e| format!("Could not parse value: {}", e))?; + + Ok(match action { + "N" => Self::North(value), + "S" => Self::South(value), + "E" => Self::East(value), + "W" => Self::West(value), + "L" => Self::Left(value), + "R" => Self::Right(value), + "F" => Self::Forward(value), + _ => Err(format!("Could not parse action: {}", action))?, + }) + } + + fn opposite_direction(self) -> Self { + match self { + Action::North(x) => Action::South(x), + Action::South(x) => Action::North(x), + Action::East(x) => Action::West(x), + Action::West(x) => Action::East(x), + _ => panic!("Invalid direction"), + } + } + + fn right_direction(self) -> Self { + match self { + Action::North(x) => Action::East(x), + Action::South(x) => Action::West(x), + Action::East(x) => Action::South(x), + Action::West(x) => Action::North(x), + _ => panic!("Invalid direction"), + } + } + + fn left_direction(self) -> Self { + match self { + Action::North(x) => Action::West(x), + Action::South(x) => Action::East(x), + Action::East(x) => Action::North(x), + Action::West(x) => Action::South(x), + _ => panic!("Invalid direction"), + } + } +} + +fn parse_actions(input: &str) -> Result, String> { + input.lines().map(Action::new).collect() +} + +fn simulate_ship_movement(actions: &Vec) -> (i64, i64) { + let mut coords: (i64, i64) = (0, 0); + let mut direction = Action::East(0); + + for action in actions { + // If the action is Action::Forward, we instead want to move + // in a direction determined by our current angle. + // + // So we convert Action::Forward to a concrete direction. + + let converted_action = if let &Action::Forward(amount) = action { + match direction { + Action::North(_) => Action::North(amount), + Action::South(_) => Action::South(amount), + Action::East(_) => Action::East(amount), + Action::West(_) => Action::West(amount), + _ => unreachable!("Direction can only be NSEW."), + } + } else { + *action + }; + + match converted_action { + Action::North(amount) => { + coords.1 += amount as i64; + } + Action::South(amount) => { + coords.1 -= amount as i64; + } + Action::East(amount) => { + coords.0 += amount as i64; + } + Action::West(amount) => { + coords.0 -= amount as i64; + } + Action::Left(amount) => match amount % 360 { + 0 => direction = direction, + 90 => direction = direction.left_direction(), + 180 => direction = direction.opposite_direction(), + 270 => direction = direction.right_direction(), + _ => panic!("Only 90 degree turns allowed"), + }, + Action::Right(amount) => match amount % 360 { + 0 => direction = direction, + 90 => direction = direction.right_direction(), + 180 => direction = direction.opposite_direction(), + 270 => direction = direction.left_direction(), + _ => panic!("Only 90 degree turns allowed"), + }, + Action::Forward(_) => unreachable!("Converted previously"), + } + } + + coords +} + +#[cfg(test)] +mod tests { + use super::*; + use indoc::indoc; + + #[test] + fn test_simple() -> Result<(), Box> { + let input = indoc!( + "F10 + N3 + F7 + R90 + F11 + " + ); + + let actions = parse_actions(&input)?; + let location = simulate_ship_movement(&actions); + assert_eq!(location.0.abs() + location.1.abs(), 25); + + Ok(()) + } +}