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use fj_math::{Transform, Vector};

use crate::{
    local::Local,
    objects::{
        Curve, Cycle, CyclesInFace, Edge, Face, FaceBRep, GlobalVertex, Sketch,
        Solid, Surface, Vertex,
    },
};

/// Transform an object
///
/// # Implementation Note
///
/// So far, a general `transform` method is available, along some convenience
/// methods for more specific transformations.
///
/// More convenience methods can be added as required. The only reason this
/// hasn't been done so far, is that no one has put in the work yet.
pub trait TransformObject: Sized {
    /// Transform the object
    #[must_use]
    fn transform(self, transform: &Transform) -> Self;

    /// Translate the object
    #[must_use]
    fn translate(self, offset: impl Into<Vector<3>>) -> Self {
        self.transform(&Transform::translation(offset))
    }

    /// Rotate the object
    #[must_use]
    fn rotate(self, axis_angle: impl Into<Vector<3>>) -> Self {
        self.transform(&Transform::rotation(axis_angle))
    }
}

impl TransformObject for Curve<3> {
    fn transform(self, transform: &Transform) -> Self {
        match self {
            Self::Circle(curve) => {
                Self::Circle(transform.transform_circle(&curve))
            }
            Self::Line(curve) => Self::Line(transform.transform_line(&curve)),
        }
    }
}

impl TransformObject for Cycle {
    fn transform(mut self, transform: &Transform) -> Self {
        for edge in &mut self.edges {
            *edge = edge.transform(transform);
        }

        self
    }
}

impl TransformObject for Edge {
    fn transform(self, transform: &Transform) -> Self {
        let curve = Local::new(
            self.curve.local(),
            self.curve.global().transform(transform),
        );

        let vertices = self.vertices.map(|vertex| vertex.transform(transform));

        Self { curve, vertices }
    }
}

impl TransformObject for Face {
    fn transform(self, transform: &Transform) -> Self {
        match self {
            Self::Face(face) => {
                let surface = face.surface.transform(transform);

                let exteriors = transform_cycles(&face.exteriors, transform);
                let interiors = transform_cycles(&face.interiors, transform);

                let color = face.color;

                Self::Face(FaceBRep {
                    surface,
                    exteriors,
                    interiors,
                    color,
                })
            }
            Self::Triangles(triangles) => {
                let mut target = Vec::new();

                for (triangle, color) in triangles {
                    let triangle = transform.transform_triangle(&triangle);
                    target.push((triangle, color));
                }

                Self::Triangles(target)
            }
        }
    }
}

impl TransformObject for GlobalVertex {
    fn transform(self, transform: &Transform) -> Self {
        let position = transform.transform_point(&self.position());
        Self::from_position(position)
    }
}

impl TransformObject for Sketch {
    fn transform(self, transform: &Transform) -> Self {
        let faces = self
            .into_faces()
            .into_iter()
            .map(|face| face.transform(transform));
        Self::from_faces(faces)
    }
}

impl TransformObject for Solid {
    fn transform(self, transform: &Transform) -> Self {
        let faces = self
            .into_faces()
            .into_iter()
            .map(|face| face.transform(transform));
        Self::from_faces(faces)
    }
}

impl TransformObject for Surface {
    fn transform(self, transform: &Transform) -> Self {
        match self {
            Self::SweptCurve(surface) => {
                Self::SweptCurve(surface.transform(transform))
            }
        }
    }
}

impl TransformObject for Vertex {
    fn transform(self, transform: &Transform) -> Self {
        Self::new(self.position(), self.global().transform(transform))
    }
}

/// Transform a shape
pub fn transform_faces(faces: &mut Vec<Face>, transform: &Transform) {
    for face in faces {
        *face = face.clone().transform(transform);
    }
}

fn transform_cycles(
    cycles: &CyclesInFace,
    transform: &Transform,
) -> CyclesInFace {
    let cycles = cycles.as_local().map(|cycle| cycle.transform(transform));

    CyclesInFace::new(cycles)
}