use glc::vector::Vector3f;
use serde::{Deserialize, Serialize};
use specs::{
    error::NoError,
    saveload::{ConvertSaveload, Marker},
    Component, Entity, HashMapStorage,
};

#[derive(Clone, Debug, Default, Serialize, Deserialize)]
pub struct Player {
    index: usize,
    color: Vector3f,
}

#[derive(Copy, Clone, Debug)]
pub struct Owned {
    owner: Entity,
}

#[derive(Serialize, Deserialize)]
pub struct OwnedData<M> {
    pub owner: M,
}

impl Player {
    #[inline]
    pub fn new(color: Vector3f) -> Self {
        Self {
            index: next_index(),
            color,
        }
    }

    #[inline]
    pub fn index(&self) -> usize {
        self.index
    }

    #[inline]
    pub fn color(&self) -> &Vector3f {
        &self.color
    }
}

impl Component for Player {
    type Storage = HashMapStorage<Self>;
}

impl Owned {
    pub fn new(owner: Entity) -> Self {
        Self { owner }
    }

    pub fn owner(&self) -> Entity {
        self.owner
    }
}

impl Component for Owned {
    type Storage = HashMapStorage<Self>;
}

impl<M> ConvertSaveload<M> for Owned
where
    for<'de> M: Marker + Serialize + Deserialize<'de>,
{
    type Data = OwnedData<M>;
    type Error = NoError;

    fn convert_into<F>(&self, mut ids: F) -> Result<Self::Data, Self::Error>
    where
        F: FnMut(Entity) -> Option<M>,
    {
        let owner = ids(self.owner).unwrap();

        Ok(OwnedData { owner })
    }

    fn convert_from<F>(data: Self::Data, mut ids: F) -> Result<Self, Self::Error>
    where
        F: FnMut(M) -> Option<Entity>,
    {
        let owner = ids(data.owner).unwrap();

        Ok(Owned { owner })
    }
}

fn next_index() -> usize {
    use std::sync::atomic::{AtomicUsize, Ordering};

    static NEXT_INDEX: AtomicUsize = AtomicUsize::new(0);

    NEXT_INDEX.fetch_add(1, Ordering::Relaxed)
}