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use crate::{ResolvedVc, TaskInput, Vc};

// NOTE: If you add new implementations of this trait, you'll need to modify
// `expand_task_input_type` in `turbo-tasks-macros/src/func.rs`.
pub trait FromTaskInput: private::Sealed {
    type TaskInput: TaskInput;
    fn from_task_input(from: Self::TaskInput) -> Self;
}

mod private {
    use super::*;
    /// Implements the sealed trait pattern:
    /// <https://rust-lang.github.io/api-guidelines/future-proofing.html>
    pub trait Sealed {}
    impl<T> Sealed for ResolvedVc<T> where T: ?Sized {}
    impl<T> Sealed for Vec<T> where T: FromTaskInput {}
    impl<T> Sealed for Option<T> where T: FromTaskInput {}
}

impl<T> FromTaskInput for ResolvedVc<T>
where
    T: Send + Sync + ?Sized,
{
    type TaskInput = Vc<T>;
    fn from_task_input(from: Vc<T>) -> ResolvedVc<T> {
        debug_assert!(
            from.is_resolved(),
            "Outer `Vc`s are always resolved before this is called"
        );
        ResolvedVc { node: from }
    }
}

impl<T> FromTaskInput for Vec<T>
where
    T: FromTaskInput,
{
    type TaskInput = Vec<T::TaskInput>;
    fn from_task_input(from: Vec<T::TaskInput>) -> Vec<T> {
        let mut converted = Vec::with_capacity(from.len());
        for value in from {
            converted.push(T::from_task_input(value));
        }
        converted
    }
}

impl<T> FromTaskInput for Option<T>
where
    T: FromTaskInput,
{
    type TaskInput = Option<T::TaskInput>;
    fn from_task_input(from: Option<T::TaskInput>) -> Option<T> {
        from.map(T::from_task_input)
    }
}

	use crate::{ResolvedVc, TaskInput, Vc};

	// NOTE: If you add new implementations of this trait, you'll need to modify
	// `expand_task_input_type` in `turbo-tasks-macros/src/func.rs`.
	pub trait FromTaskInput: private::Sealed {
	type TaskInput: TaskInput;
	fn from_task_input(from: Self::TaskInput) -> Self;
	}

	mod private {
	use super::*;
	/// Implements the sealed trait pattern:
	/// <https://rust-lang.github.io/api-guidelines/future-proofing.html>
	pub trait Sealed {}
	impl<T> Sealed for ResolvedVc<T> where T: ?Sized {}
	impl<T> Sealed for Vec<T> where T: FromTaskInput {}
	impl<T> Sealed for Option<T> where T: FromTaskInput {}
	}

	impl<T> FromTaskInput for ResolvedVc<T>
	where
	T: Send + Sync + ?Sized,
	{
	type TaskInput = Vc<T>;
	fn from_task_input(from: Vc<T>) -> ResolvedVc<T> {
	debug_assert!(
	from.is_resolved(),
	"Outer `Vc`s are always resolved before this is called"
	);
	ResolvedVc { node: from }
	}
	}

	impl<T> FromTaskInput for Vec<T>
	where
	T: FromTaskInput,
	{
	type TaskInput = Vec<T::TaskInput>;
	fn from_task_input(from: Vec<T::TaskInput>) -> Vec<T> {
	let mut converted = Vec::with_capacity(from.len());
	for value in from {
	converted.push(T::from_task_input(value));
	}
	converted
	}
	}

	impl<T> FromTaskInput for Option<T>
	where
	T: FromTaskInput,
	{
	type TaskInput = Option<T::TaskInput>;
	fn from_task_input(from: Option<T::TaskInput>) -> Option<T> {
	from.map(T::from_task_input)
	}
	}