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use crate::{
    CoordinateType, GeometryCollection, Line, LineString, MultiLineString, MultiPoint,
    MultiPolygon, Point, Polygon,
};

/// An enum representing any possible geometry type.
///
/// All `Geo` types can be converted to a `Geometry` member using `.into()` (as part of the
/// `std::convert::Into` pattern).
#[derive(PartialEq, Clone, Debug)]
pub enum Geometry<T>
where
    T: CoordinateType,
{
    Point(Point<T>),
    Line(Line<T>),
    LineString(LineString<T>),
    Polygon(Polygon<T>),
    MultiPoint(MultiPoint<T>),
    MultiLineString(MultiLineString<T>),
    MultiPolygon(MultiPolygon<T>),
    GeometryCollection(GeometryCollection<T>),
}

impl<T: CoordinateType> From<Point<T>> for Geometry<T> {
    fn from(x: Point<T>) -> Geometry<T> {
        Geometry::Point(x)
    }
}
impl<T: CoordinateType> From<Line<T>> for Geometry<T> {
    fn from(x: Line<T>) -> Geometry<T> {
        Geometry::Line(x)
    }
}
impl<T: CoordinateType> From<LineString<T>> for Geometry<T> {
    fn from(x: LineString<T>) -> Geometry<T> {
        Geometry::LineString(x)
    }
}
impl<T: CoordinateType> From<Polygon<T>> for Geometry<T> {
    fn from(x: Polygon<T>) -> Geometry<T> {
        Geometry::Polygon(x)
    }
}
impl<T: CoordinateType> From<MultiPoint<T>> for Geometry<T> {
    fn from(x: MultiPoint<T>) -> Geometry<T> {
        Geometry::MultiPoint(x)
    }
}
impl<T: CoordinateType> From<MultiLineString<T>> for Geometry<T> {
    fn from(x: MultiLineString<T>) -> Geometry<T> {
        Geometry::MultiLineString(x)
    }
}
impl<T: CoordinateType> From<MultiPolygon<T>> for Geometry<T> {
    fn from(x: MultiPolygon<T>) -> Geometry<T> {
        Geometry::MultiPolygon(x)
    }
}

impl<T: CoordinateType> Geometry<T> {
    /// If this Geometry is a Point, then return that, else None.
    ///
    /// # Examples
    ///
    /// ```
    /// use geo_types::*;
    /// let g = Geometry::Point(Point::new(0., 0.));
    /// let p2: Point<f32> = g.into_point().unwrap();
    /// assert_eq!(p2, Point::new(0., 0.,));
    /// ```
    pub fn into_point(self) -> Option<Point<T>> {
        if let Geometry::Point(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a LineString, then return that LineString, else None.
    pub fn into_line_string(self) -> Option<LineString<T>> {
        if let Geometry::LineString(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a Line, then return that Line, else None.
    pub fn into_line(self) -> Option<Line<T>> {
        if let Geometry::Line(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a Polygon, then return that, else None.
    pub fn into_polygon(self) -> Option<Polygon<T>> {
        if let Geometry::Polygon(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a MultiPoint, then return that, else None.
    pub fn into_multi_point(self) -> Option<MultiPoint<T>> {
        if let Geometry::MultiPoint(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a MultiLineString, then return that, else None.
    pub fn into_multi_line_string(self) -> Option<MultiLineString<T>> {
        if let Geometry::MultiLineString(x) = self {
            Some(x)
        } else {
            None
        }
    }

    /// If this Geometry is a MultiPolygon, then return that, else None.
    pub fn into_multi_polygon(self) -> Option<MultiPolygon<T>> {
        if let Geometry::MultiPolygon(x) = self {
            Some(x)
        } else {
            None
        }
    }
}