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use crate::{CoordinateType, Point};
use std::iter::FromIterator;

/// A collection of [`Point`s](struct.Point.html).
///
/// # Examples
///
/// Iterating over a `MultiPoint` yields the `Point`s inside.
///
/// ```
/// use geo_types::{MultiPoint, Point};
/// let points: MultiPoint<_> = vec![(0., 0.), (1., 2.)].into();
/// for point in points {
///     println!("Point x = {}, y = {}", point.x(), point.y());
/// }
/// ```
#[derive(PartialEq, Clone, Debug)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct MultiPoint<T>(pub Vec<Point<T>>)
where
    T: CoordinateType;

impl<T: CoordinateType, IP: Into<Point<T>>> From<IP> for MultiPoint<T> {
    /// Convert a single `Point` (or something which can be converted to a `Point`) into a
    /// one-member `MultiPoint`
    fn from(x: IP) -> MultiPoint<T> {
        MultiPoint(vec![x.into()])
    }
}

impl<T: CoordinateType, IP: Into<Point<T>>> From<Vec<IP>> for MultiPoint<T> {
    /// Convert a `Vec` of `Points` (or `Vec` of things which can be converted to a `Point`) into a
    /// `MultiPoint`.
    fn from(v: Vec<IP>) -> MultiPoint<T> {
        MultiPoint(v.into_iter().map(|p| p.into()).collect())
    }
}

impl<T: CoordinateType, IP: Into<Point<T>>> FromIterator<IP> for MultiPoint<T> {
    /// Collect the results of a `Point` iterator into a `MultiPoint`
    fn from_iter<I: IntoIterator<Item = IP>>(iter: I) -> Self {
        MultiPoint(iter.into_iter().map(|p| p.into()).collect())
    }
}

/// Iterate over the `Point`s in this `MultiPoint`.
impl<T: CoordinateType> IntoIterator for MultiPoint<T> {
    type Item = Point<T>;
    type IntoIter = ::std::vec::IntoIter<Point<T>>;

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