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use std::ptr;

use ffi;

use super::{Context, Integer};
use crate::{require_gcrypt_ver, NonNull};

#[derive(Debug)]
pub struct Point(NonNull<ffi::gcry_mpi_point_t>);

impl Drop for Point {
    #[inline]
    fn drop(&mut self) {
        unsafe {
            ffi::gcry_mpi_point_release(self.as_raw());
        }
    }
}

impl Clone for Point {
    #[inline]
    fn clone(&self) -> Point {
        require_gcrypt_ver! {
            (1, 8) => {
                unsafe { Point::from_raw(ffi::gcry_mpi_point_copy(self.as_raw())) }
            } else {
                let (x, y, z) = self.to_coords();
                unsafe {
                    Point::from_raw(ffi::gcry_mpi_point_snatch_set(
                            ptr::null_mut(),
                            x.into_raw(),
                            y.into_raw(),
                            z.into_raw(),
                            ))
                }
            }
        }
    }

    #[inline]
    fn clone_from(&mut self, source: &Point) {
        let (x, y, z) = source.to_coords();
        unsafe {
            ffi::gcry_mpi_point_snatch_set(self.as_raw(), x.into_raw(), y.into_raw(), z.into_raw());
        }
    }
}

impl Point {
    impl_wrapper!(Point: ffi::gcry_mpi_point_t);

    #[inline]
    pub fn zero() -> Point {
        Point::new(0)
    }

    #[inline]
    pub fn new(nbits: u32) -> Point {
        let _ = crate::init_default();
        unsafe { Point::from_raw(ffi::gcry_mpi_point_new(nbits.into())) }
    }

    #[inline]
    pub fn from_coords(x: Option<Integer>, y: Option<Integer>, z: Option<Integer>) -> Point {
        let _ = crate::init_default();
        unsafe {
            let x = x.map_or(ptr::null_mut(), |v| v.into_raw());
            let y = y.map_or(ptr::null_mut(), |v| v.into_raw());
            let z = z.map_or(ptr::null_mut(), |v| v.into_raw());
            Point::from_raw(ffi::gcry_mpi_point_snatch_set(ptr::null_mut(), x, y, z))
        }
    }

    #[inline]
    pub fn set(&mut self, x: Option<Integer>, y: Option<Integer>, z: Option<Integer>) {
        unsafe {
            let x = x.map_or(ptr::null_mut(), |v| v.into_raw());
            let y = y.map_or(ptr::null_mut(), |v| v.into_raw());
            let z = z.map_or(ptr::null_mut(), |v| v.into_raw());
            ffi::gcry_mpi_point_snatch_set(self.as_raw(), x, y, z);
        }
    }

    #[inline]
    pub fn to_coords(&self) -> (Integer, Integer, Integer) {
        let x = Integer::zero();
        let y = Integer::zero();
        let z = Integer::zero();
        unsafe {
            ffi::gcry_mpi_point_get(x.as_raw(), y.as_raw(), z.as_raw(), self.as_raw());
        }
        (x, y, z)
    }

    #[inline]
    pub fn into_coords(self) -> (Integer, Integer, Integer) {
        let x = Integer::zero();
        let y = Integer::zero();
        let z = Integer::zero();
        unsafe {
            ffi::gcry_mpi_point_snatch_get(x.as_raw(), y.as_raw(), z.as_raw(), self.into_raw());
        }
        (x, y, z)
    }

    #[inline]
    pub fn get_affine(&self, ctx: &Context) -> Option<(Integer, Integer)> {
        let x = Integer::zero();
        let y = Integer::zero();
        let result = unsafe {
            ffi::gcry_mpi_ec_get_affine(x.as_raw(), y.as_raw(), self.as_raw(), ctx.as_raw())
        };
        if result == 0 {
            Some((x, y))
        } else {
            None
        }
    }

    #[inline]
    pub fn on_curve(&self, ctx: &Context) -> bool {
        unsafe { ffi::gcry_mpi_ec_curve_point(self.as_raw(), ctx.as_raw()) != 0 }
    }

    #[inline]
    pub fn add(self, other: &Point, ctx: &Context) -> Point {
        unsafe {
            ffi::gcry_mpi_ec_add(self.as_raw(), self.as_raw(), other.as_raw(), ctx.as_raw());
        }
        self
    }

    #[inline]
    pub fn mul(self, n: &Integer, ctx: &Context) -> Point {
        unsafe {
            ffi::gcry_mpi_ec_mul(self.as_raw(), n.as_raw(), self.as_raw(), ctx.as_raw());
        }
        self
    }
}

impl Default for Point {
    #[inline]
    fn default() -> Self {
        Self::zero()
    }
}

impl From<(Integer, Integer, Integer)> for Point {
    #[inline]
    fn from((x, y, z): (Integer, Integer, Integer)) -> Self {
        Self::from_coords(Some(x), Some(y), Some(z))
    }
}

impl Into<(Integer, Integer, Integer)> for Point {
    #[inline]
    fn into(self) -> (Integer, Integer, Integer) {
        self.into_coords()
    }
}