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// Take a look at the license at the top of the repository in the LICENSE file.

use glib::translate::Uninitialized;

use crate::RGBA;
use glib::translate::*;
use std::fmt;
use std::str::FromStr;

impl RGBA {
    pub fn new(red: f64, green: f64, blue: f64, alpha: f64) -> RGBA {
        skip_assert_initialized!();
        unsafe {
            RGBA::unsafe_from(ffi::GdkRGBA {
                red,
                green,
                blue,
                alpha,
            })
        }
    }

    pub fn red(&self) -> f64 {
        self.inner.red
    }

    pub fn set_red(&mut self, red: f64) {
        self.inner.red = red;
    }

    pub fn green(&self) -> f64 {
        self.inner.green
    }

    pub fn set_green(&mut self, green: f64) {
        self.inner.green = green;
    }

    pub fn blue(&self) -> f64 {
        self.inner.blue
    }

    pub fn set_blue(&mut self, blue: f64) {
        self.inner.blue = blue;
    }

    pub fn alpha(&self) -> f64 {
        self.inner.alpha
    }

    pub fn set_alpha(&mut self, alpha: f64) {
        self.inner.alpha = alpha;
    }

    /// Parses a textual representation of a color, filling in
    /// the `red`, `green`, `blue` and `alpha` fields of the `self` [`RGBA`][crate::RGBA].
    ///
    /// The string can be either one of:
    /// - A standard name (Taken from the X11 rgb.txt file).
    /// - A hexadecimal value in the form “\`rgb`”, “\`rrggbb`”,
    ///  “\`rrrgggbbb`” or ”\`rrrrggggbbbb`”
    /// - A RGB color in the form “rgb(r,g,b)” (In this case the color will
    ///  have full opacity)
    /// - A RGBA color in the form “rgba(r,g,b,a)”
    ///
    /// Where “r”, “g”, “b” and “a” are respectively the red, green, blue and
    /// alpha color values. In the last two cases, “r”, “g”, and “b” are either integers
    /// in the range 0 to 255 or percentage values in the range 0% to 100%, and
    /// a is a floating point value in the range 0 to 1.
    /// ## `spec`
    /// the string specifying the color
    ///
    /// # Returns
    ///
    /// [`true`] if the parsing succeeded
    #[doc(alias = "gdk_rgba_parse")]
    pub fn parse(s: &str) -> Result<Self, glib::error::BoolError> {
        skip_assert_initialized!();
        unsafe {
            let mut res = RGBA::uninitialized();
            glib::result_from_gboolean!(
                ffi::gdk_rgba_parse(res.to_glib_none_mut().0, s.to_glib_none().0),
                "Can't parse RGBA"
            )
            .map(|_| res)
        }
    }

    pub const BLACK: RGBA = RGBA {
        inner: ffi::GdkRGBA {
            red: 0f64,
            green: 0f64,
            blue: 0f64,
            alpha: 1f64,
        },
    };

    pub const BLUE: RGBA = RGBA {
        inner: ffi::GdkRGBA {
            red: 0f64,
            green: 0f64,
            blue: 1f64,
            alpha: 1f64,
        },
    };

    pub const GREEN: RGBA = RGBA {
        inner: ffi::GdkRGBA {
            red: 0f64,
            green: 1f64,
            blue: 0f64,
            alpha: 1f64,
        },
    };

    pub const RED: RGBA = RGBA {
        inner: ffi::GdkRGBA {
            red: 1f64,
            green: 0f64,
            blue: 0f64,
            alpha: 1f64,
        },
    };

    pub const WHITE: RGBA = RGBA {
        inner: ffi::GdkRGBA {
            red: 1f64,
            green: 1f64,
            blue: 1f64,
            alpha: 1f64,
        },
    };
}

impl fmt::Debug for RGBA {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("RGBA")
            .field("red", &self.red())
            .field("green", &self.green())
            .field("blue", &self.blue())
            .field("alpha", &self.alpha())
            .finish()
    }
}

impl FromStr for RGBA {
    type Err = glib::BoolError;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        skip_assert_initialized!();
        RGBA::parse(s)
    }
}