use std::ops::Not;

use crate::layout::{Vec2, vec2};

#[derive(Copy, Clone, Eq, PartialEq)]
pub enum Axis {
    X,
    Y,
}

impl Not for Axis {
    type Output = Self;

    fn not(self) -> Self::Output {
        match self {
            Self::X => Self::Y,
            Self::Y => Self::X,
        }
    }
}

#[derive(Clone, Copy, Eq, PartialEq)]
pub struct Dir {
    pub axis: Axis,
    pub sign: Sign,
}

impl Dir {
    pub const fn new(axis: Axis, dir: Sign) -> Self {
        Self { axis, sign: dir }
    }

    pub const LEFT: Self = Self::new(Axis::X, Sign::Neg);
    pub const RIGHT: Self = Self::new(Axis::X, Sign::Pos);
    pub const UP: Self = Self::new(Axis::Y, Sign::Neg);
    pub const DOWN: Self = Self::new(Axis::Y, Sign::Pos);
}

#[derive(Clone, Copy, Eq, PartialEq)]
pub enum Sign {
    Neg,
    Pos,
}

impl Vec2 {
    pub fn axis(&self, axis: Axis) -> f32 {
        match axis {
            Axis::X => self.x,
            Axis::Y => self.y,
        }
    }

    pub fn axis_mut(&mut self, axis: Axis) -> &mut f32 {
        match axis {
            Axis::X => &mut self.x,
            Axis::Y => &mut self.y,
        }
    }

    pub const fn from_axis(axis: Axis, aligned: f32, ortho: f32) -> Self {
        Self {
            x: match axis {
                Axis::X => aligned,
                Axis::Y => ortho,
            },
            y: match axis {
                Axis::Y => aligned,
                Axis::X => ortho,
            },
        }
    }
}

#[derive(Clone, Copy, PartialEq, Eq)]
pub enum Align {
    TopLeft,
    Top,
    TopRight,
    Left,
    Center,
    Right,
    BotLeft,
    Bot,
    BotRight,
}

impl Align {
    pub const fn rel(&self) -> Vec2 {
        match self {
            Self::TopLeft => vec2(0.0, 0.0),
            Self::Top => vec2(0.5, 0.0),
            Self::TopRight => vec2(1.0, 0.0),
            Self::Left => vec2(0.0, 0.5),
            Self::Center => vec2(0.5, 0.5),
            Self::Right => vec2(1.0, 0.5),
            Self::BotLeft => vec2(0.0, 1.0),
            Self::Bot => vec2(0.5, 1.0),
            Self::BotRight => vec2(1.0, 1.0),
        }
    }
}