use std::ops::Add;
use std::ops::Neg;
use std::ops::Sub;

#[derive(PartialEq, Clone, Copy, Debug)]
pub struct Coordinate {
    pub x: f64,
    pub y: f64,
}

#[derive(PartialEq, Clone, Copy, Debug)]
pub struct Point(pub Coordinate);

impl Point {
    /// Creates a new point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.234, 2.345);
    ///
    /// assert_eq!(p.x(), 1.234);
    /// assert_eq!(p.y(), 2.345);
    /// ```
    pub fn new(x: f64, y: f64) -> Point {
        Point(Coordinate {
            x: x,
            y: y,
        })
    }

    /// Returns the x/horizontal component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.234, 2.345);
    ///
    /// assert_eq!(p.x(), 1.234);
    /// ```
    pub fn x(&self) -> f64 {
        self.0.x
    }

    /// Sets the x/horizontal component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let mut p = Point::new(1.234, 2.345);
    /// p.set_x(9.876);
    ///
    /// assert_eq!(p.x(), 9.876);
    /// ```
    pub fn set_x(&mut self, x: f64) -> &mut Point {
        self.0.x = x;
        self
    }

    /// Returns the y/vertical component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.234, 2.345);
    ///
    /// assert_eq!(p.y(), 2.345);
    /// ```
    pub fn y(&self) -> f64 {
        self.0.y
    }

    /// Sets the y/vertical component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let mut p = Point::new(1.234, 2.345);
    /// p.set_y(9.876);
    ///
    /// assert_eq!(p.y(), 9.876);
    /// ```
    pub fn set_y(&mut self, y: f64) -> &mut Point {
        self.0.y = y;
        self
    }

    /// Returns the longitude/horizontal component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.234, 2.345);
    ///
    /// assert_eq!(p.lng(), 1.234);
    /// ```
    pub fn lng(&self) -> f64 {
        self.x()
    }

    /// Sets the longitude/horizontal component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let mut p = Point::new(1.234, 2.345);
    /// p.set_lng(9.876);
    ///
    /// assert_eq!(p.lng(), 9.876);
    /// ```
    pub fn set_lng(&mut self, lng: f64) -> &mut Point {
        self.set_x(lng)
    }

    /// Returns the latitude/vertical component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.234, 2.345);
    ///
    /// assert_eq!(p.lat(), 2.345);
    /// ```
    pub fn lat(&self) -> f64 {
        self.y()
    }

    /// Sets the latitude/vertical component of the point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let mut p = Point::new(1.234, 2.345);
    /// p.set_lat(9.876);
    ///
    /// assert_eq!(p.lat(), 9.876);
    /// ```
    pub fn set_lat(&mut self, lat: f64) -> &mut Point {
        self.set_y(lat)
    }

    /// Returns the dot product of the two points:
    /// `dot = x1 * x2 + y1 * y2`
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.5, 0.5);
    /// let dot = p.dot(&Point::new(2.0, 4.5));
    ///
    /// assert_eq!(dot, 5.25);
    /// ```
    pub fn dot(&self, point: &Point) -> f64 {
        self.x() * point.x() + self.y() * point.y()
    }
}

impl Neg for Point {
    type Output = Point;

    /// Returns a point with the x and y components negated.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = -Point::new(-1.25, 2.5);
    ///
    /// assert_eq!(p.x(), 1.25);
    /// assert_eq!(p.y(), -2.5);
    /// ```
    fn neg(self) -> Point {
        Point::new(-self.x(), -self.y())
    }
}

impl Add for Point {
    type Output = Point;

    /// Add a point to the given point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.25, 2.5) + Point::new(1.5, 2.5);
    ///
    /// assert_eq!(p.x(), 2.75);
    /// assert_eq!(p.y(), 5.0);
    /// ```
    fn add(self, _rhs: Point) -> Point {
        Point::new(self.x() + _rhs.x(), self.y() + _rhs.y())
    }
}

impl Sub for Point {
    type Output = Point;

    /// Subtract a point from the given point.
    ///
    /// ```
    /// use geo::Point;
    ///
    /// let p = Point::new(1.25, 3.0) - Point::new(1.5, 2.5);
    ///
    /// assert_eq!(p.x(), -0.25);
    /// assert_eq!(p.y(), 0.5);
    /// ```
    fn sub(self, _rhs: Point) -> Point {
        Point::new(self.x() - _rhs.x(), self.y() - _rhs.y())
    }
}

#[derive(PartialEq, Clone, Debug)]
pub struct MultiPoint(pub Vec<Point>);

#[derive(PartialEq, Clone, Debug)]
pub struct LineString(pub Vec<Point>);

#[derive(PartialEq, Clone, Debug)]
pub struct MultiLineString(pub Vec<LineString>);

#[derive(PartialEq, Clone, Debug)]
pub struct Polygon(pub LineString, pub Vec<LineString>);

#[derive(PartialEq, Clone, Debug)]
pub struct MultiPolygon(pub Vec<Polygon>);

#[derive(PartialEq, Clone, Debug)]
pub struct GeometryCollection(pub Vec<Geometry>);

#[derive(PartialEq, Clone, Debug)]
pub enum Geometry {
    Point(Point),
    LineString(LineString),
    Polygon(Polygon),
    MultiPoint(MultiPoint),
    MultiLineString(MultiLineString),
    MultiPolygon(MultiPolygon),
    GeometryCollection(GeometryCollection)
}

#[cfg(test)]
mod test {
    use ::types::*;

    #[test]
    fn type_test() {
        let c = Coordinate {
            x: 40.02f64,
            y: 116.34
        };

        let p = Point(c);

        let Point(c2) = p;
        assert_eq!(c, c2);
        assert_eq!(c.x, c2.x);
        assert_eq!(c.y, c2.y);
    }
}