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// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use length::Length;
use num::Zero;

use num_lib::NumCast;
use std::fmt;
use std::ops::{Mul, Div};

#[derive(Clone, Copy, Eq, RustcDecodable, RustcEncodable, PartialEq)]
#[cfg_attr(feature = "plugins", derive(HeapSizeOf, Deserialize, Serialize))]
pub struct Size2D<T> {
    pub width: T,
    pub height: T
}

impl<T: fmt::Debug> fmt::Debug for Size2D<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}×{:?}", self.width, self.height)
    }
}

impl<T: fmt::Display> fmt::Display for Size2D<T> {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "({}x{})", self.width, self.height)
    }
}

impl<T: Clone> Size2D<T> {
    pub fn new(width: T, height: T) -> Size2D<T> {
        Size2D {
            width: width,
            height: height
        }
    }
}

impl<T:Copy + Clone + Mul<T, Output=U>, U> Size2D<T> {
    pub fn area(&self) -> U { self.width * self.height }
}

impl<T: Zero> Size2D<T> {
    pub fn zero() -> Size2D<T> {
        Size2D {
            width: Zero::zero(),
            height: Zero::zero(),
        }
    }
}

impl<T: Zero> Zero for Size2D<T> {
    fn zero() -> Size2D<T> {
        Size2D {
            width: Zero::zero(),
            height: Zero::zero(),
        }
    }
}

impl<Scale: Copy, T0: Mul<Scale, Output=T1>, T1: Clone> Mul<Scale> for Size2D<T0> {
    type Output = Size2D<T1>;
    #[inline]
    fn mul(self, scale: Scale) -> Size2D<T1> {
        Size2D::new(self.width * scale, self.height * scale)
    }
}

impl<Scale: Copy, T0: Div<Scale, Output=T1>, T1: Clone> Div<Scale> for Size2D<T0> {
    type Output = Size2D<T1>;
    #[inline]
    fn div(self, scale: Scale) -> Size2D<T1> {
        Size2D::new(self.width / scale, self.height / scale)
    }
}

// Convenient aliases for Size2D with typed units

pub type TypedSize2D<Unit, T> = Size2D<Length<Unit, T>>;

impl<Unit, T: Clone> Size2D<Length<Unit, T>> {
    pub fn typed(width: T, height: T) -> TypedSize2D<Unit, T> {
        Size2D::new(Length::new(width), Length::new(height))
    }

    /// Drop the units, preserving only the numeric value.
    pub fn to_untyped(&self) -> Size2D<T> {
        Size2D::new(self.width.get(), self.height.get())
    }

    /// Tag a unitless value with units.
    pub fn from_untyped(p: &Size2D<T>) -> TypedSize2D<Unit, T> {
        Size2D::new(Length::new(p.width.clone()), Length::new(p.height.clone()))
    }
}

impl<Unit, T0: NumCast + Clone> Size2D<Length<Unit, T0>> {
    /// Cast from one numeric representation to another, preserving the units.
    pub fn cast<T1: NumCast + Clone>(&self) -> Option<Size2D<Length<Unit, T1>>> {
        match (self.width.cast(), self.height.cast()) {
            (Some(w), Some(h)) => Some(Size2D::new(w, h)),
            _ => None
        }
    }
}

// Convenience functions for common casts
impl<Unit, T: NumCast + Clone> Size2D<Length<Unit, T>> {
    pub fn as_f32(&self) -> Size2D<Length<Unit, f32>> {
        self.cast().unwrap()
    }

    pub fn as_uint(&self) -> Size2D<Length<Unit, usize>> {
        self.cast().unwrap()
    }
}