use std::any::Any;

#[derive(Default)]
struct Test {
    age: i32,
}

trait Custom: AsAny {
    fn hello(&self) -> String;
}

trait AsAny {
    fn as_any(&self) -> &dyn Any;
}

impl AsAny for Test {
    fn as_any(&self) -> &dyn Any {
        self
    }
}

impl Custom for Test {
    fn hello(&self) -> String {
        String::from("hello")
    }
}

fn main() {
    let test = Test { age: 1 };
    let custom: Box<dyn Custom> = Box::new(test);
    println!("age: {}", custom.as_any().downcast_ref::<Test>().unwrap().age)
}

use std::any::{Any, TypeId};

#[derive(Default)]
struct Test1 {
    age: i32,
}

#[derive(Default)]
struct Test2 {
    salary: i32,
}

trait Custom: AsAny {
    fn hello(&self) -> String;
}

trait AsAny {
    fn as_any(&self) -> &dyn Any;

    fn type_id(&self) -> TypeId;
}

impl AsAny for Test1 {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn type_id(&self) -> TypeId {
        TypeId::of::<Self>()
    }
}

impl Custom for Test1 {
    fn hello(&self) -> String {
        String::from("hello from test1")
    }
}

impl AsAny for Test2 {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn type_id(&self) -> TypeId {
        TypeId::of::<Self>()
    }
}

impl Custom for Test2 {
    fn hello(&self) -> String {
        String::from("hello from test2")
    }
}

fn main() {
    let mut v: Vec<Box<dyn Custom>> = vec![];
    let test1 = Box::new(Test1 { age: 1 });
    let test2 = Box::new(Test2 { salary: 2 });
    v.push(test1);
    v.push(test2);

    for item in v {
        println!("{}", item.hello());
        let any_item = item.as_any();

        if any_item.type_id() == TypeId::of::<Test1>() {
            println!("age: {}", any_item.downcast_ref::<Test1>().unwrap().age)
        }
        if any_item.type_id() == TypeId::of::<Test2>() {
            println!("salary: {}", any_item.downcast_ref::<Test2>().unwrap().salary)
        }
    }
}

//! This library provides some utility traits to make working with [`Any`] smoother.
//! This crate contains similar functionality to the `downcast` crate, but simpler,
use std::any::{Any, TypeId};

/// This trait is an extension trait to [`Any`], and adds methods to retrieve a `&dyn Any`
pub trait AsAny: Any {
    fn as_any(&self) -> &dyn Any;

    fn as_any_mut(&mut self) -> &mut dyn Any;

    /// Gets the type name of `self`
    fn type_name(&self) -> TypeId;
}

impl<T: 'static> AsAny for T {
    #[inline(always)]
    fn as_any(&self) -> &dyn Any {
        self
    }

    #[inline(always)]
    fn as_any_mut(&mut self) -> &mut dyn Any {
        self
    }

    #[inline(always)]
    fn type_name(&self) -> TypeId {
        TypeId::of::<T>()
    }
}

/// This is a shim around `AaAny` to avoid some boilerplate code.
/// It is a separate trait because it is also implemented
/// on runtime polymorphic traits (which are `!Sized`).
pub trait Downcast: AsAny {
    /// Returns `true` if the boxed type is the same as `T`.
    ///
    /// Forward to the method defined on the type `Any`.
    #[inline(always)]
    fn is<T>(&self) -> bool
    where
        T: AsAny,
    {
        self.as_any().is::<T>()
    }

    /// Forward to the method defined on the type `Any`.
    #[inline(always)]
    fn downcast_ref<T>(&self) -> Option<&T>
    where
        T: AsAny,
    {
        self.as_any().downcast_ref()
    }

    /// Forward to the method defined on the type `Any`.
    #[inline(always)]
    fn downcast_mut<T>(&mut self) -> Option<&mut T>
    where
        T: AsAny,
    {
        self.as_any_mut().downcast_mut()
    }
}

impl<T: ?Sized + AsAny> Downcast for T {}

use boost_rs::types::as_any::{AsAny, Downcast};

trait Custom: AsAny {
    fn hello(&self) -> String;
}

struct Test {
    age: i32,
}

impl Custom for Test {
    fn hello(&self) -> String {
        String::from("This is Test!")
    }
}

fn main() {
    let x: Box<dyn Custom> = Box::new(Test { age: 1 });
    // Wrong:
    // println!("age: {}", x.downcast_ref::<Test>().unwrap().age);
    println!("age: {}", (*x).downcast_ref::<Test>().unwrap().age);

    let y: &dyn Custom = &Test { age: 2 };
    println!("age: {}", y.downcast_ref::<Test>().unwrap().age)
}