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#![forbid(unsafe_code)]

pub mod ex;

#[derive(Clone, Copy, Debug, PartialEq, PartialOrd)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "kebab-case", tag = "type"))]
pub enum SelectExample {
    AstroidPedal { a: f64 },
    CassiniOval { a: f64, c: f64 },
    CassiniAstroid { ca: f64, cc: f64, aa: f64 },
    CassiniAntiAstroid { ca: f64, cc: f64, aa: f64 },
    CassiniAstroidTsq { ca: f64, cc: f64, aa: f64 },

    Dumbbell { a: f64, p: f64 },
    LineHandled { a: f64 },
    Ellipse { a: f64, b: f64 },
    Lemniskate { a: f64 },
    CirclePow { k: f64 },
    CircleSinChain1 { w: f64 },

    Spiral { k: u32 },
    Spiral1D { k: u32 },
    SingularPetalRose { k: u32 },

    Circle,
    Square,
    Intersect8,
    Intersect8pp,
}

impl SelectExample {
    pub fn add_offset(&mut self, l: f64) {
        match self {
            Self::AstroidPedal { a } => *a += l,
            Self::CassiniOval { a, c } => {
                *a += l;
                *c += l;
            }
            Self::CassiniAstroid { ca, cc, aa }
            | Self::CassiniAntiAstroid { ca, cc, aa }
            | Self::CassiniAstroidTsq { ca, cc, aa } => {
                *ca += l;
                *cc += l;
                *aa += l;
            }
            Self::Dumbbell { a, .. } => {
                *a += l;
            }
            Self::LineHandled { a } => {
                *a += l;
            }
            Self::Ellipse { a, b } => {
                *a /= 1.0 + l;
                *b *= 1.0 + l;
            }
            Self::Lemniskate { a } => {
                *a += l;
            }
            Self::CirclePow { k } => {
                *k += l;
            }
            Self::CircleSinChain1 { w } => {
                *w += l;
            },
            Self::Spiral { .. }
            | Self::Spiral1D { .. }
            | Self::SingularPetalRose { .. }
            | Self::Circle
            | Self::Square
            | Self::Intersect8
            | Self::Intersect8pp => {
                panic!("offsetting not supported for this example")
            }
        }
    }

    pub fn instantiate(self) -> Box<dyn Fn(f64) -> [f64; 2]> {
        match self {
            Self::AstroidPedal { a } => Box::new(move |t: f64| ex::astroid_pedal(t, a)),
            Self::CassiniOval { a, c } => Box::new(ex::cassini_oval(a, c)),
            Self::CassiniAstroid { ca, cc, aa } => Box::new(ex::cassini_astroid(ca, cc, aa)),
            Self::CassiniAntiAstroid { ca, cc, aa } => {
                Box::new(ex::cassini_anti_astroid(ca, cc, aa))
            }
            Self::CassiniAstroidTsq { ca, cc, aa } => {
                let x = ex::cassini_astroid(ca, cc, aa);
                Box::new(move |t: f64| x(t * t))
            }
            Self::Dumbbell { a, p } => Box::new(ex::dumbbell(a, p)),
            Self::LineHandled { a } => Box::new(ex::line_handled(a)),
            Self::Ellipse { a, b } => Box::new(ex::ellipse(a, b)),
            Self::Lemniskate { a } => Box::new(move |t: f64| ex::lemniskate(t, a)),
            Self::CirclePow { k } => Box::new(ex::circle_pow(k)),
            Self::CircleSinChain1 { w } => Box::new(ex::circle_sin_chain1(w)),
            Self::Spiral { k } => Box::new(ex::spiral(k)),
            Self::Spiral1D { k } => Box::new(ex::spiral_1d(k)),
            Self::SingularPetalRose { k } => Box::new(ex::singular_petal_rose(k)),
            Self::Circle => Box::new(ex::circle),
            Self::Square => Box::new(ex::square),
            Self::Intersect8 => Box::new(ex::intersect_eight),
            Self::Intersect8pp => Box::new(ex::intersect_8pp),
        }
    }
}