#![allow(non_camel_case_types)]

enum Space_Object {
    Asteroid(Asteroid),
    Spaceship(Spaceship),
}

enum Asteroid {
    Asteroid,
    Exploding_Asteroid,
}

enum Spaceship {
    Spaceship,
    Apollo_Spacecraft,
}

fn collide(a: Space_Object, b: Space_Object) {

    match a {
    Space_Object::Asteroid(a) => {

        match a {
        Asteroid::Asteroid => {

            match b {
            Space_Object::Asteroid(b) => {

                match b {
                Asteroid::Asteroid =>{
                    println!("Asteroid hit Asteroid");
                },

                Asteroid::Exploding_Asteroid => {
                    println!("Asteroid hit Exploding_Asteroid");
                }};
            },

            Space_Object::Spaceship(b) => {

                match b {
                Spaceship::Spaceship => {
                    println!("Asteroid hit Spaceship");
                },

                Spaceship::Apollo_Spacecraft => {
                    println!("Asteroid hit Apollo_Spacecraft");
                }};
            }};
        },

        Asteroid::Exploding_Asteroid => {

            match b {
            Space_Object::Asteroid(b) => {

                match b {
                Asteroid::Asteroid =>{
                    println!("Exploding_Asteroid hit Asteroid");
                },

                Asteroid::Exploding_Asteroid => {
                    println!("Exploding_Asteroid hit Exploding_Asteroid");
                }};
            },

            Space_Object::Spaceship(b) => {

                match b {
                Spaceship::Spaceship => {
                    println!("Exploding_Asteroid hit Spaceship");
                },

                Spaceship::Apollo_Spacecraft => {
                    println!("Exploding_Asteroid hit Apollo_Spacecraft");
                }};
            }};
        }};
    },

    Space_Object::Spaceship(a) => {

        match a {
        Spaceship::Spaceship => {

            match b {
            Space_Object::Spaceship(b) => {

                match b {
                Spaceship::Spaceship => {
                    println!("Spaceship hit Spaceship");
                },

                Spaceship::Apollo_Spacecraft => {
                    println!("Spaceship hit Apollo_Spacecraft");
                }};
            },

            Space_Object::Asteroid(b) => {

                match b {
                Asteroid::Asteroid => {
                    println!("Spaceship hit Asteroid");
                },

                Asteroid::Exploding_Asteroid => {
                    println!("Spaceship hit Exploding_Asteroid");
                }};
            }};
        },

        Spaceship::Apollo_Spacecraft => {

            match b {
            Space_Object::Spaceship(b) => {

                match b {
                Spaceship::Spaceship => {
                    println!("Apollo_Spacecraft hit Spaceship");
                },

                Spaceship::Apollo_Spacecraft => {
                    println!("Apollo_Spacecraft hit Apollo_Spacecraft");
                }};
            },

            Space_Object::Asteroid(b) => {

                match b {
                Asteroid::Asteroid => {
                    println!("Apollo_Spacecraft hit Asteroid");
                },

                Asteroid::Exploding_Asteroid => {
                    println!("Apollo_Spacecraft hit Exploding_Asteroid");
                }};
            }};
        }};
    }};

}

fn main() {
    {
        let a = Space_Object::Spaceship(Spaceship::Spaceship);
        let b = Space_Object::Spaceship(Spaceship::Spaceship);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Spaceship);
        let b = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Spaceship);
        let b = Space_Object::Asteroid(Asteroid::Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Spaceship);
        let b = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        let b = Space_Object::Spaceship(Spaceship::Spaceship);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        let b = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        let b = Space_Object::Asteroid(Asteroid::Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        let b = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Asteroid);
        let b = Space_Object::Spaceship(Spaceship::Spaceship);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Asteroid);
        let b = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Asteroid);
        let b = Space_Object::Asteroid(Asteroid::Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Asteroid);
        let b = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        let b = Space_Object::Spaceship(Spaceship::Spaceship);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        let b = Space_Object::Spaceship(Spaceship::Apollo_Spacecraft);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        let b = Space_Object::Asteroid(Asteroid::Asteroid);
        collide(a, b);
    }

    {
        let a = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        let b = Space_Object::Asteroid(Asteroid::Exploding_Asteroid);
        collide(a, b);
    }
}

// =>
// Spaceship hit Spaceship
// Spaceship hit Apollo_Spacecraft
// Spaceship hit Asteroid
// Spaceship hit Exploding_Asteroid
// Apollo_Spacecraft hit Spaceship
// Apollo_Spacecraft hit Apollo_Spacecraft
// Apollo_Spacecraft hit Asteroid
// Apollo_Spacecraft hit Exploding_Asteroid
// Asteroid hit Spaceship
// Asteroid hit Apollo_Spacecraft
// Asteroid hit Asteroid
// Asteroid hit Exploding_Asteroid
// Exploding_Asteroid hit Spaceship
// Exploding_Asteroid hit Apollo_Spacecraft
// Exploding_Asteroid hit Asteroid
// Exploding_Asteroid hit Exploding_Asteroid