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use crate::{prelude::*, scalar, Matrix, Path, Point, Vector};
use skia_bindings::{self as sb, SkContourMeasure, SkContourMeasureIter, SkRefCntBase};
use std::fmt;

pub type ContourMeasure = RCHandle<SkContourMeasure>;
unsafe_send_sync!(ContourMeasure);

impl NativeRefCountedBase for SkContourMeasure {
    type Base = SkRefCntBase;
}

bitflags! {
    #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
    pub struct MatrixFlags : u32 {
        const GET_POSITION = sb::SkContourMeasure_MatrixFlags_kGetPosition_MatrixFlag as _;
        const GET_TANGENT = sb::SkContourMeasure_MatrixFlags_kGetTangent_MatrixFlag as _;
        const GET_POS_AND_TAN = Self::GET_POSITION.bits() | Self::GET_TANGENT.bits();
    }
}

impl Default for MatrixFlags {
    fn default() -> Self {
        Self::GET_POS_AND_TAN
    }
}

impl fmt::Debug for ContourMeasure {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("ContourMeasure")
            .field("length", &self.length())
            .field("is_closed", &self.is_closed())
            .finish()
    }
}

impl ContourMeasure {
    pub fn length(&self) -> scalar {
        unsafe { sb::C_SkContourMeasure_length(self.native()) }
    }

    pub fn pos_tan(&self, distance: scalar) -> Option<(Point, Vector)> {
        let mut p = Point::default();
        let mut v = Vector::default();
        unsafe {
            self.native()
                .getPosTan(distance, p.native_mut(), v.native_mut())
        }
        .if_true_some((p, v))
    }

    pub fn get_matrix(
        &self,
        distance: scalar,
        flags: impl Into<Option<MatrixFlags>>,
    ) -> Option<Matrix> {
        let mut m = Matrix::default();
        unsafe {
            self.native().getMatrix(
                distance,
                m.native_mut(),
                // note: depending on the OS, different representation types are generated for
                // MatrixFlags, so the try_into() is required, even though clippy complains about
                // it.
                #[allow(clippy::useless_conversion)]
                flags.into().unwrap_or_default().bits().try_into().unwrap(),
            )
        }
        .if_true_some(m)
    }

    pub fn segment(
        &self,
        start_d: scalar,
        stop_d: scalar,
        start_with_move_to: bool,
    ) -> Option<Path> {
        let mut p = Path::default();
        unsafe {
            self.native()
                .getSegment(start_d, stop_d, p.native_mut(), start_with_move_to)
        }
        .if_true_some(p)
    }

    pub fn is_closed(&self) -> bool {
        unsafe { sb::C_SkContourMeasure_isClosed(self.native()) }
    }
}

pub type ContourMeasureIter = Handle<SkContourMeasureIter>;
unsafe_send_sync!(ContourMeasureIter);

impl NativeDrop for SkContourMeasureIter {
    fn drop(&mut self) {
        unsafe {
            sb::C_SkContourMeasureIter_destruct(self);
        }
    }
}

impl Iterator for ContourMeasureIter {
    type Item = ContourMeasure;

    fn next(&mut self) -> Option<Self::Item> {
        ContourMeasure::from_ptr(unsafe { sb::C_SkContourMeasureIter_next(self.native_mut()) })
    }
}

impl fmt::Debug for ContourMeasureIter {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("ContourMeasureIter").finish()
    }
}

impl ContourMeasureIter {
    // Canonical new:
    pub fn new(path: &Path, force_closed: bool, res_scale: impl Into<Option<scalar>>) -> Self {
        Self::from_path(path, force_closed, res_scale)
    }

    // TODO: rename to of_path? for_path?
    // TODO: may deprecate in favor of Self::new().
    pub fn from_path(
        path: &Path,
        force_closed: bool,
        res_scale: impl Into<Option<scalar>>,
    ) -> Self {
        Self::from_native_c(unsafe {
            SkContourMeasureIter::new1(path.native(), force_closed, res_scale.into().unwrap_or(1.0))
        })
    }

    pub fn reset(
        &mut self,
        path: &Path,
        force_closed: bool,
        res_scale: impl Into<Option<scalar>>,
    ) -> &mut Self {
        unsafe {
            self.native_mut()
                .reset(path.native(), force_closed, res_scale.into().unwrap_or(1.0))
        }
        self
    }
}