use crate::data::GameRules;

#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Copy)]
pub enum BoatDirection {
    Left,
    Right,
    Top,
    Bottom,
}

impl BoatDirection {
    pub fn shift_coordinates(&self, coordinates: Coordinates, nth: usize) -> Coordinates {
        let shift = match self {
            BoatDirection::Left => (1, 0),
            BoatDirection::Right => (-1, 0),
            BoatDirection::Top => (0, -1),
            BoatDirection::Bottom => (0, 1),
        };

        Coordinates::new(
            coordinates.x + shift.0 * nth as i32,
            coordinates.y + shift.1 * nth as i32,
        )
    }
}

#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Copy, Eq, PartialEq)]
pub struct Coordinates {
    x: i32,
    y: i32,
}

impl Coordinates {
    pub fn new<E>(x: E, y: E) -> Self
    where
        E: Into<i32>,
    {
        Self {
            x: x.into(),
            y: y.into(),
        }
    }
}

#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Copy)]
pub struct BoatPosition {
    start: Coordinates,
    len: usize,
    direction: BoatDirection,
}

impl BoatPosition {
    pub fn all_coordinates(&self) -> Vec<Coordinates> {
        let mut positions = Vec::with_capacity(self.len);
        for i in 0..self.len {
            positions.push(self.direction.shift_coordinates(self.start, i));
        }
        positions
    }
}

#[derive(serde::Serialize, serde::Deserialize, Debug, Clone)]
pub struct BoatsLayout(Vec<BoatPosition>);

impl BoatsLayout {
    pub fn gen_random_for_rules(rules: &GameRules) -> Self {
        todo!()
    }
}

#[cfg(test)]
mod test {
    use crate::data::boats_layout::{BoatDirection, BoatPosition, Coordinates};

    #[test]
    fn get_boat_coordinates() {
        let position = BoatPosition {
            start: Coordinates { x: 1, y: 1 },
            len: 3,
            direction: BoatDirection::Bottom,
        };
        let coordinates = position.all_coordinates();
        assert_eq!(
            coordinates,
            vec![
                Coordinates::new(1, 1),
                Coordinates::new(1, 2),
                Coordinates::new(1, 3),
            ]
        )
    }
}