use std::any::TypeId;
use std::collections::hash_map::Entry as MapEntry;
use std::fmt::Debug;
use std::marker::PhantomData;

use crate::typeid;
use crate::HashMap;

#[cfg(all(feature = "sync", not(feature = "log")))]
mod __erased_ty {
    use crate::HashMap;
    use std::any::Any;
    use std::any::TypeId;

    pub trait ErasedTy: Any + Sync + Send + 'static {}

    impl<T: Any + Sync + Send + 'static> ErasedTy for T {}

    pub type BoxedAny = Box<dyn Any + Send + Sync>;

    #[derive(Default)]
    pub struct AnyMap(pub(crate) HashMap<TypeId, BoxedAny>);
}

#[cfg(all(feature = "sync", feature = "log"))]
mod __erased_ty {
    use crate::HashMap;
    use std::any::Any;
    use std::any::TypeId;
    use std::fmt::Debug;

    pub trait ErasedTy: Any + Debug + Sync + Send + 'static {}

    impl<T: Any + Debug + Sync + Send + 'static> ErasedTy for T {}

    pub type BoxedAny = Box<dyn Any + Send + Sync>;

    #[derive(Default)]
    pub struct AnyMap(pub(crate) HashMap<TypeId, BoxedAny>);
}

#[cfg(all(not(feature = "sync"), not(feature = "log")))]
mod __erased_ty {
    use crate::HashMap;
    use std::any::Any;
    use std::any::TypeId;

    pub trait ErasedTy: Any + 'static {}

    impl<T: Any + 'static> ErasedTy for T {}

    pub type BoxedAny = Box<dyn Any>;

    #[derive(Default)]
    pub struct AnyMap(pub(crate) HashMap<TypeId, BoxedAny>);
}

#[cfg(all(not(feature = "sync"), feature = "log"))]
mod __erased_ty {
    use crate::HashMap;
    use std::any::Any;
    use std::any::TypeId;
    use std::fmt::Debug;

    pub trait ErasedTy: Any + Debug + 'static {}

    impl<T: Any + Debug + 'static> ErasedTy for T {}

    pub type BoxedAny = Box<dyn Any>;

    #[derive(Default)]
    pub struct AnyMap(pub(crate) HashMap<TypeId, BoxedAny>);
}

pub use __erased_ty::AnyMap;
pub use __erased_ty::BoxedAny;
pub use __erased_ty::ErasedTy;

impl Debug for AnyMap {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let field_ids = self
            .0
            .iter()
            .map(|v| format!("{:?}", v.0))
            .collect::<Vec<String>>()
            .join(", ");
        f.debug_tuple("AnyMap")
            .field(&format!("[{field_ids}]",))
            .finish()
    }
}

impl AnyMap {
    pub fn with_value<T: ErasedTy>(mut self, value: T) -> Self {
        self.0.insert(typeid::<T>(), Box::new(value));
        self
    }
}

impl AnyMap {
    pub fn new() -> Self {
        Self(HashMap::default())
    }

    pub fn len(&self) -> usize {
        self.0.len()
    }

    pub fn clear(&mut self) {
        self.0.clear()
    }

    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }

    pub fn contain<T: ErasedTy>(&self) -> bool {
        self.0.contains_key(&typeid::<T>())
    }

    pub fn entry<T: ErasedTy>(&mut self) -> Entry<'_, T> {
        Entry::new(self.0.entry(typeid::<T>()))
    }

    pub fn insert<T: ErasedTy>(&mut self, value: T) -> Option<T> {
        self.0
            .insert(typeid::<T>(), Box::new(value))
            .and_then(|v| v.downcast().ok().map(|v| *v))
    }

    pub fn remove<T: ErasedTy>(&mut self) -> Option<T> {
        self.0
            .remove(&typeid::<T>())
            .and_then(|v| v.downcast().ok().map(|v| *v))
    }

    pub fn value<T: ErasedTy>(&self) -> Option<&T> {
        self.0.get(&typeid::<T>()).and_then(|v| v.downcast_ref())
    }

    pub fn value_mut<T: ErasedTy>(&mut self) -> Option<&mut T> {
        self.0
            .get_mut(&typeid::<T>())
            .and_then(|v| v.downcast_mut())
    }
}

pub struct Entry<'a, T> {
    inner: MapEntry<'a, TypeId, BoxedAny>,

    marker: PhantomData<T>,
}

impl<'a, T> Entry<'a, T>
where
    T: ErasedTy,
{
    pub fn new(entry: MapEntry<'a, TypeId, BoxedAny>) -> Self {
        Self {
            inner: entry,
            marker: PhantomData,
        }
    }

    pub fn key(&self) -> &TypeId {
        self.inner.key()
    }

    pub fn or_insert(self, val: T) -> &'a mut T {
        self.inner
            .or_insert_with(|| Box::new(val))
            .downcast_mut::<T>()
            .unwrap()
    }

    pub fn or_insert_with<F>(self, f: F) -> &'a mut T
    where
        F: FnOnce() -> T,
    {
        self.or_insert(f())
    }

    pub fn or_insert_with_key<F>(self, f: F) -> &'a mut T
    where
        F: FnOnce(&TypeId) -> T,
    {
        let val = f(self.key());
        self.or_insert(val)
    }

    pub fn and_modify<F>(mut self, f: F) -> Self
    where
        F: FnOnce(&mut T),
    {
        self.inner = self.inner.and_modify(|v| f(v.downcast_mut::<T>().unwrap()));
        self
    }
}

impl<'a, T> Entry<'a, T>
where
    T: ErasedTy + Default,
{
    #[allow(clippy::or_fun_call)]
    pub fn or_default(self) -> &'a mut T {
        self.or_insert_with(|| T::default())
    }
}