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use std::ops::Deref;

use vector_config::configurable_component;

pub use crate::config::ComponentKey;

/// A list of upstream [source][sources] or [transform][transforms] IDs.
///
/// Wildcards (`*`) are supported.
///
/// See [configuration][configuration] for more info.
///
/// [sources]: https://vector.dev/docs/reference/configuration/sources/
/// [transforms]: https://vector.dev/docs/reference/configuration/transforms/
/// [configuration]: https://vector.dev/docs/reference/configuration/
#[configurable_component]
#[configurable(metadata(
    docs::examples = "my-source-or-transform-id",
    docs::examples = "prefix-*"
))]
#[derive(Clone, Debug)]
pub struct Inputs<T: 'static>(Vec<T>);

impl<T> Inputs<T> {
    /// Returns `true` if no inputs are present.
    #[must_use]
    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }
}

impl<T> Deref for Inputs<T> {
    type Target = [T];

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T> Default for Inputs<T> {
    fn default() -> Self {
        Self(Vec::new())
    }
}

impl<T, U> PartialEq<&[U]> for Inputs<T>
where
    T: PartialEq<U>,
{
    fn eq(&self, other: &&[U]) -> bool {
        self.0.as_slice() == &other[..]
    }
}

impl<T, U> PartialEq<Vec<U>> for Inputs<T>
where
    T: PartialEq<U>,
{
    fn eq(&self, other: &Vec<U>) -> bool {
        &self.0 == other
    }
}

impl<T> Extend<T> for Inputs<T> {
    fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
        self.0.extend(iter);
    }
}

impl<T> IntoIterator for Inputs<T> {
    type Item = T;
    type IntoIter = std::vec::IntoIter<T>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.into_iter()
    }
}

impl<'a, T> IntoIterator for &'a Inputs<T> {
    type Item = &'a T;
    type IntoIter = std::slice::Iter<'a, T>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.iter()
    }
}

impl<T> FromIterator<T> for Inputs<T> {
    fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
        Self(Vec::from_iter(iter))
    }
}

impl<T> From<Vec<T>> for Inputs<T> {
    fn from(inputs: Vec<T>) -> Self {
        Self(inputs)
    }
}