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use std::marker;
use std::iter;
use crate::{
    Bitmask, MaskType, entity::EntitiesStorage,
    storage::{IntoSendStorage, FastIndexExt, ReadOnlyStorage, StorageRef},
    entity::Entity,
};
use super::SafeIter;
use super::{DataAccesses, FromComponent, UnorderedData};
use std::any::TypeId;
#[cfg(components_64)]
use num_traits::Zero;

/// Operator that matches every entity that doe has this component without locking it's storage
///
/// The selected data will have a () element in it's position.
///
/// ```
/// # #[macro_use] extern crate rinecs_derive;
/// # use rinecs::*;
/// # #[derive(Component, Debug)]
/// # struct Position{x: f32, y: f32}
/// # #[derive(Component, Debug)]
/// # struct Velocity{x: f32, y: f32}
/// # let mut world = World::new();
/// # let entities = world.entities();
/// for (pos, _) in entities.iter_for::<(Read<Position>, Has<Velocity>)>(){
///     //...
/// }
/// ```
///
/// Will select all entities that have Position and Velocity
pub struct Has<T>{
    _marker: marker::PhantomData<T>,
}

impl<T> FromComponent<'_, ()> for Has<T>{
    fn from_component(_: ()) -> Has<T>{
        Has{
            _marker: marker::PhantomData
        }
    }
}

pub struct StorageHas<'a, T>{
    entities_masks: &'a [(Entity, MaskType)],
    component_mask: MaskType,
    _marker_t: marker::PhantomData<&'a T>,
}

impl<'a, T> StorageHas<'a, T>{
    pub fn new(entities_masks: &'a [(Entity, MaskType)], component_mask: MaskType) -> StorageHas<'a,T>{
        StorageHas{
            entities_masks,
            component_mask,
            _marker_t: marker::PhantomData,
        }
    }
}

impl<'a, 'r, T> FastIndexExt for StorageHas<'a, T>
where T: 'static,
{
    type FastIndex = ();
    type StaticTypeId = Has<T>;

    fn fast_index(&self, _guid: usize) -> () {
        ()
    }
}

impl<'a, 'r, T> StorageRef<'r> for StorageHas<'a, T>
where T: 'static,
{
    type Data = Has<T>;
    type Component = ();

    unsafe fn get_fast_unchecked(&mut self, _idx: ()) -> (){
    }

    unsafe fn get_unchecked(&mut self, _guid: usize) -> (){
    }

    fn contains(&self, guid: usize) -> bool{
        &self.entities_masks[guid].1 & &self.component_mask != MaskType::zero()
    }
}

impl<'a, 'r, T> IntoSendStorage<'r> for StorageHas<'a, T>
where T: 'static,
{
    type SendStorage = StorageHas<'a, T>;

    fn into_send_storage(&'r mut self) -> Self::SendStorage {
        StorageHas {
            entities_masks: self.entities_masks,
            component_mask: self.component_mask.clone(),
            _marker_t: marker::PhantomData
        }
    }
}

unsafe impl<'a, T: 'static> ReadOnlyStorage for StorageHas<'a, T>{}

unsafe impl<T> SafeIter<'_> for Has<T> {}

impl<'a, T: 'static> UnorderedData<'a> for Has<T> {
    type Iter = iter::Repeat<()>;
    type IterMut = iter::Repeat<()>;
    type Components = T;
    type ComponentsRef = ();
    type Storage = StorageHas<'a, T>;

    fn query_mask<E: EntitiesStorage>(entities: &E) -> Bitmask{
        Bitmask::has(entities.component_mask::<T>())
    }

    fn into_iter<E: EntitiesStorage>(_: &'a E) -> Self::Iter{
        iter::repeat(())
    }

    fn into_iter_mut<E: EntitiesStorage>(entities: &'a E) -> Self::Iter {
        Self::into_iter(entities)
    }

    fn storage<E: EntitiesStorage>(entities: &'a E) -> Option<Self::Storage> {
        let entities_masks = entities.entities_ref();
        let component_mask = entities.component_mask::<T>();
        Some(StorageHas{
            entities_masks,
            component_mask,
            _marker_t: marker::PhantomData,
        })
    }
}

impl<'a, T: 'static> DataAccesses for Has<T> {
    fn reads() -> Vec<TypeId>{ vec![] }
    fn writes() -> Vec<TypeId>{ vec![] }
}