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

use std::fmt;

use glib::translate::*;

use crate::{Euler, Matrix, Quaternion, Vec3, Vec4};

impl Quaternion {
    /// Initializes a [`Quaternion`][crate::Quaternion] using the given four values.
    /// ## `x`
    /// the first component of the quaternion
    /// ## `y`
    /// the second component of the quaternion
    /// ## `z`
    /// the third component of the quaternion
    /// ## `w`
    /// the fourth component of the quaternion
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init")]
    pub fn new(x: f32, y: f32, z: f32, w: f32) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init(quat.to_glib_none_mut().0, x, y, z, w);
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using an `angle` on a
    /// specific `axis`.
    /// ## `angle`
    /// the rotation on a given axis, in degrees
    /// ## `axis`
    /// the axis of rotation, expressed as a vector
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_from_angle_vec3")]
    #[doc(alias = "init_from_angle_vec3")]
    pub fn from_angle_vec3(angle: f32, axis: &Vec3) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_angle_vec3(
                quat.to_glib_none_mut().0,
                angle,
                axis.to_glib_none().0,
            );
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using the values of
    /// the [Euler angles](http://en.wikipedia.org/wiki/Euler_angles)
    /// on each axis.
    ///
    /// See also: [`from_euler()`][Self::from_euler()]
    /// ## `deg_x`
    /// rotation angle on the X axis (yaw), in degrees
    /// ## `deg_y`
    /// rotation angle on the Y axis (pitch), in degrees
    /// ## `deg_z`
    /// rotation angle on the Z axis (roll), in degrees
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_from_angles")]
    #[doc(alias = "init_from_angles")]
    pub fn from_angles(deg_x: f32, deg_y: f32, deg_z: f32) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_angles(
                quat.to_glib_none_mut().0,
                deg_x,
                deg_y,
                deg_z,
            );
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using the given [`Euler`][crate::Euler].
    /// ## `e`
    /// a [`Euler`][crate::Euler]
    ///
    /// # Returns
    ///
    /// the initialized [`Quaternion`][crate::Quaternion]
    #[doc(alias = "graphene_quaternion_init_from_euler")]
    #[doc(alias = "init_from_euler")]
    pub fn from_euler(e: &Euler) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_euler(quat.to_glib_none_mut().0, e.to_glib_none().0);
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using the rotation components
    /// of a transformation matrix.
    /// ## `m`
    /// a [`Matrix`][crate::Matrix]
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_from_matrix")]
    #[doc(alias = "init_from_matrix")]
    pub fn from_matrix(m: &Matrix) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_matrix(
                quat.to_glib_none_mut().0,
                m.to_glib_none().0,
            );
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using the values of
    /// the [Euler angles](http://en.wikipedia.org/wiki/Euler_angles)
    /// on each axis.
    ///
    /// See also: [`from_euler()`][Self::from_euler()]
    /// ## `rad_x`
    /// rotation angle on the X axis (yaw), in radians
    /// ## `rad_y`
    /// rotation angle on the Y axis (pitch), in radians
    /// ## `rad_z`
    /// rotation angle on the Z axis (roll), in radians
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_from_radians")]
    #[doc(alias = "init_from_radians")]
    pub fn from_radians(rad_x: f32, rad_y: f32, rad_z: f32) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_radians(
                quat.to_glib_none_mut().0,
                rad_x,
                rad_y,
                rad_z,
            );
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] with the values from `src`.
    /// ## `src`
    /// a [`Vec4`][crate::Vec4]
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_from_vec4")]
    #[doc(alias = "init_from_vec4")]
    pub fn from_vec4(src: &Vec4) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_from_vec4(
                quat.to_glib_none_mut().0,
                src.to_glib_none().0,
            );
            quat
        }
    }

    /// Initializes a [`Quaternion`][crate::Quaternion] using the identity
    /// transformation.
    ///
    /// # Returns
    ///
    /// the initialized quaternion
    #[doc(alias = "graphene_quaternion_init_identity")]
    #[doc(alias = "init_identity")]
    pub fn new_identity() -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut quat = Self::uninitialized();
            ffi::graphene_quaternion_init_identity(quat.to_glib_none_mut().0);
            quat
        }
    }

    #[inline]
    pub fn x(&self) -> f32 {
        self.inner.x
    }

    #[inline]
    pub fn y(&self) -> f32 {
        self.inner.y
    }

    #[inline]
    pub fn z(&self) -> f32 {
        self.inner.z
    }

    #[inline]
    pub fn w(&self) -> f32 {
        self.inner.w
    }
}

impl fmt::Debug for Quaternion {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Quaternion")
            .field("x", &self.x())
            .field("y", &self.y())
            .field("z", &self.z())
            .field("w", &self.w())
            .finish()
    }
}