use crate::core::image::HostImage;
use crate::core::texture::{FloatTexture as HostFloatTexture, SpectrumTexture as HostSpectrumTexture};
use crate::spectra::default_colorspace;
use crate::Arena;
use shared::core::image::Image;
use shared::core::texture::{FloatTexture, SpectrumTexture};
use shared::textures::*;
use shared::Ptr;
use std::sync::Arc;

pub trait Upload {
    type Target;
    fn upload(self, arena: &Arena) -> Self::Target;
}

fn convert_float(tex: &HostFloatTexture, arena: &Arena) -> FloatTexture {
    match tex {
        HostFloatTexture::Constant(t) => FloatTexture::Constant(*t),
        HostFloatTexture::Bilerp(t) => FloatTexture::Bilerp(*t),
        HostFloatTexture::Checkerboard(t) => FloatTexture::Checkerboard(*t),
        HostFloatTexture::Dots(t) => FloatTexture::Dots(*t),
        HostFloatTexture::FBm(t) => FloatTexture::FBm(*t),
        HostFloatTexture::Windy(t) => FloatTexture::Windy(*t),
        HostFloatTexture::Wrinkled(t) => FloatTexture::Wrinkled(*t),

        HostFloatTexture::Scaled(t) => {
            let tex = arena.alloc(convert_float(t.tex.as_ref(), arena));
            let scale = arena.alloc(convert_float(t.scale.as_ref(), arena));
            FloatTexture::Scaled(FloatScaledTexture { tex, scale })
        }

        HostFloatTexture::Mix(t) => {
            let tex1 = arena.alloc(convert_float(t.tex1.as_ref(), arena));
            let tex2 = arena.alloc(convert_float(t.tex2.as_ref(), arena));
            let amount = arena.alloc(convert_float(t.amount.as_ref(), arena));
            FloatTexture::Mix(FloatMixTexture { tex1, tex2, amount })
        }

        HostFloatTexture::DirectionMix(t) => {
            let tex1 = arena.alloc(convert_float(t.tex1.as_ref(), arena));
            let tex2 = arena.alloc(convert_float(t.tex2.as_ref(), arena));
            FloatTexture::DirectionMix(FloatDirectionMixTexture {
                tex1,
                tex2,
                dir: t.dir,
            })
        }

        HostFloatTexture::Image(t) => {
            let image = arena.alloc(t.base.mipmap.base_image().inner.clone());
            let tex_obj = arena.get_texture_object(&t.base.mipmap);
            FloatTexture::Image(FloatImageTexture {
                image,
                mapping: t.base.mapping,
                wrap_mode: t.base.mipmap.wrap_mode,
                tex_obj,
                scale: t.base.scale,
                invert: t.base.invert,
            })
        }
    }
}

fn convert_spectrum(tex: &HostSpectrumTexture, arena: &Arena) -> SpectrumTexture {
    match tex {
        HostSpectrumTexture::Constant(t) => SpectrumTexture::Constant(*t),
        HostSpectrumTexture::Bilerp(t) => SpectrumTexture::Bilerp(*t),
        HostSpectrumTexture::Checkerboard(t) => SpectrumTexture::Checkerboard(*t),
        HostSpectrumTexture::Dots(t) => SpectrumTexture::Dots(*t),
        HostSpectrumTexture::Marble(t) => SpectrumTexture::Marble(*t),

        HostSpectrumTexture::Scaled(t) => {
            let tex = arena.alloc(convert_spectrum(t.tex.as_ref(), arena));
            let scale = arena.alloc(convert_float(t.scale.as_ref(), arena));
            SpectrumTexture::Scaled(SpectrumScaledTexture { tex, scale })
        }

        HostSpectrumTexture::Mix(t) => {
            let tex1 = arena.alloc(convert_spectrum(t.tex1.as_ref(), arena));
            let tex2 = arena.alloc(convert_spectrum(t.tex2.as_ref(), arena));
            let amount = arena.alloc(convert_float(t.amount.as_ref(), arena));
            SpectrumTexture::Mix(SpectrumMixTexture { tex1, tex2, amount })
        }

        HostSpectrumTexture::DirectionMix(t) => {
            let tex1 = arena.alloc(convert_spectrum(t.tex1.as_ref(), arena));
            let tex2 = arena.alloc(convert_spectrum(t.tex2.as_ref(), arena));
            SpectrumTexture::DirectionMix(SpectrumDirectionMixTexture {
                tex1,
                tex2,
                dir: t.dir,
            })
        }

        HostSpectrumTexture::Image(t) => {
            let image = arena.alloc(t.base.mipmap.base_image().inner.clone());
            let tex_obj = arena.get_texture_object(&t.base.mipmap);
            SpectrumTexture::Image(SpectrumImageTexture {
                image,
                tex_obj,
                wrap_mode: t.base.mipmap.wrap_mode,
                color_space: arena
                    .alloc(t.base.mipmap.color_space.unwrap_or_else(default_colorspace)),
                mapping: t.base.mapping,
                scale: t.base.scale,
                invert: t.base.invert,
                is_single_channel: t.base.mipmap.is_single_channel(),
                spectrum_type: t.spectrum_type,
            })
        }
    }
}

impl Upload for Arc<HostFloatTexture> {
    type Target = Ptr<FloatTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc(convert_float(&self, arena))
    }
}

impl Upload for Arc<HostSpectrumTexture> {
    type Target = Ptr<SpectrumTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc(convert_spectrum(&self, arena))
    }
}

impl Upload for &HostFloatTexture {
    type Target = Ptr<FloatTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc(convert_float(self, arena))
    }
}

impl Upload for &HostSpectrumTexture {
    type Target = Ptr<SpectrumTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc(convert_spectrum(self, arena))
    }
}
impl Upload for Option<Arc<HostFloatTexture>> {
    type Target = Ptr<FloatTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc_opt(self.map(|v| convert_float(&v, arena)))
    }
}

impl Upload for Option<Arc<HostSpectrumTexture>> {
    type Target = Ptr<SpectrumTexture>;
    fn upload(self, arena: &Arena) -> Self::Target {
        arena.alloc_opt(self.map(|v| convert_spectrum(&v, arena)))
    }
}

impl Upload for HostImage {
    type Target = Ptr<Image>;
    fn upload(self, arena: &Arena) -> Ptr<Image> {
        arena.alloc(self.inner)
    }
}

impl Upload for Option<HostImage> {
    type Target = Ptr<Image>;
    fn upload(self, arena: &Arena) -> Ptr<Image> {
        arena.alloc_opt(self.map(|h| h.inner))
    }
}

impl Upload for Option<Arc<HostImage>> {
    type Target = Ptr<Image>;
    fn upload(self, arena: &Arena) -> Ptr<Image> {
        arena.alloc_opt(self.map(|h| h.as_ref().inner.clone()))
    }
}

pub trait ArenaUpload {
    fn upload<T: Upload>(&self, value: T) -> T::Target;
}

impl ArenaUpload for Arena {
    fn upload<T: Upload>(&self, value: T) -> T::Target {
        value.upload(self)
    }
}