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/*
 * // Copyright (c) 2021 Feng Yang
 * //
 * // I am making my contributions/submissions to this project solely in my
 * // personal capacity and am not conveying any rights to any intellectual
 * // property of any third parties.
 */

use crate::surface3::*;
use crate::transform3::Transform3;
use crate::implicit_surface3::ImplicitSurface3;
use crate::vector3::Vector3D;
use crate::bounding_box3::BoundingBox3D;
use crate::ray3::Ray3D;
use std::sync::{RwLock, Arc};

///
/// # 3-D implicit surface wrapper for generic Surface3 instance.
///
/// This class represents 3-D implicit surface that converts Surface3 instance
/// to an ImplicitSurface3 object. The conversion is made by evaluating closest
/// point and normal from a given point for the given (explicit) surface. Thus,
/// this conversion won't work for every single surfaces. Use this class only
/// for the basic primitives such as Sphere3 or Box3.
///
pub struct SurfaceToImplicit3 {
    _surface: Surface3Ptr,

    /// data from surface3
    pub surface_data: Surface3Data,
}

impl SurfaceToImplicit3 {
    /// Constructs an instance with generic Surface3 instance.
    pub fn new(
        surface: Surface3Ptr,
        transform: Option<Transform3>,
        is_normal_flipped: Option<bool>) -> SurfaceToImplicit3 {
        return SurfaceToImplicit3 {
            _surface: surface,
            surface_data: Surface3Data::new(transform, is_normal_flipped),
        };
    }

    /// Returns builder fox SurfaceToImplicit3.
    pub fn builder() -> Builder {
        return Builder::new();
    }

    /// Returns the raw surface instance.
    pub fn surface(&self) -> Surface3Ptr {
        return self._surface.clone();
    }
}

impl Surface3 for SurfaceToImplicit3 {
    fn closest_point_local(&self, other_point: &Vector3D) -> Vector3D {
        return self._surface.read().unwrap().closest_point(other_point);
    }

    fn bounding_box_local(&self) -> BoundingBox3D {
        return self._surface.read().unwrap().bounding_box();
    }

    fn closest_intersection_local(&self, ray: &Ray3D) -> SurfaceRayIntersection3 {
        return self._surface.read().unwrap().closest_intersection(ray);
    }

    fn closest_normal_local(&self, other_point: &Vector3D) -> Vector3D {
        return self._surface.read().unwrap().closest_normal(other_point);
    }

    fn intersects_local(&self, ray: &Ray3D) -> bool {
        return self._surface.read().unwrap().intersects(ray);
    }

    fn closest_distance_local(&self, other_point: &Vector3D) -> f64 {
        return self._surface.read().unwrap().closest_distance(other_point);
    }

    fn update_query_engine(&self) {
        self._surface.read().unwrap().update_query_engine();
    }

    fn is_bounded(&self) -> bool {
        return self._surface.read().unwrap().is_bounded();
    }

    fn is_valid_geometry(&self) -> bool {
        return self._surface.read().unwrap().is_valid_geometry();
    }

    fn view(&self) -> &Surface3Data {
        return &self.surface_data;
    }
}

impl ImplicitSurface3 for SurfaceToImplicit3 {
    fn signed_distance_local(&self, other_point: &Vector3D) -> f64 {
        let x = self._surface.read().unwrap().closest_point(other_point);
        let inside = self._surface.read().unwrap().is_inside(other_point);
        return match inside {
            true => -x.distance_to(*other_point),
            false => x.distance_to(*other_point)
        };
    }

    fn is_inside_local(&self, other_point: &Vector3D) -> bool {
        return self._surface.read().unwrap().is_inside(other_point);
    }
}

/// Shared pointer for the SurfaceToImplicit3 type.
pub type SurfaceToImplicit3Ptr = Arc<RwLock<SurfaceToImplicit3>>;

///
/// # Front-end to create SurfaceToImplicit3 objects step by step.
///
pub struct Builder {
    _surface: Option<Surface3Ptr>,

    _surface_data: Surface3Data,
}

impl Builder {
    /// Returns builder with surface.
    pub fn with_surface(&mut self, surface: Surface3Ptr) -> &mut Self {
        self._surface = Some(surface);
        return self;
    }

    /// Builds SurfaceToImplicit3.
    pub fn build(&mut self) -> SurfaceToImplicit3 {
        return SurfaceToImplicit3::new(self._surface.as_ref().unwrap().clone(),
                                       Some(self._surface_data.transform.clone()),
                                       Some(self._surface_data.is_normal_flipped));
    }

    /// Builds shared pointer of SurfaceToImplicit3 instance.
    pub fn make_shared(&mut self) -> SurfaceToImplicit3Ptr {
        return SurfaceToImplicit3Ptr::new(RwLock::new(self.build()));
    }

    /// constructor
    pub fn new() -> Builder {
        return Builder {
            _surface: None,
            _surface_data: Surface3Data::new(None, None),
        };
    }
}

impl SurfaceBuilderBase3 for Builder {
    fn view(&mut self) -> &mut Surface3Data {
        return &mut self._surface_data;
    }
}