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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use dom_struct::dom_struct;
use js::rust::HandleObject;

use crate::dom::bindings::codegen::Bindings::XRViewBinding::XREye;
use crate::dom::bindings::codegen::Bindings::XRWebGLBindingBinding::XRWebGLBinding_Binding::XRWebGLBindingMethods;
use crate::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContext_Binding::WebGLRenderingContextMethods;
use crate::dom::bindings::codegen::Bindings::XRWebGLBindingBinding::{
    XRCubeLayerInit, XRCylinderLayerInit, XREquirectLayerInit, XRProjectionLayerInit,
    XRQuadLayerInit, XRTextureType,
};
use crate::dom::bindings::codegen::UnionTypes::WebGLRenderingContextOrWebGL2RenderingContext;
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::reflector::{reflect_dom_object_with_proto, Reflector};
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::webglrenderingcontext::WebGLRenderingContext;
use crate::dom::window::Window;
use crate::dom::xrcompositionlayer::XRCompositionLayer;
use crate::dom::xrcubelayer::XRCubeLayer;
use crate::dom::xrcylinderlayer::XRCylinderLayer;
use crate::dom::xrequirectlayer::XREquirectLayer;
use crate::dom::xrframe::XRFrame;
use crate::dom::xrprojectionlayer::XRProjectionLayer;
use crate::dom::xrquadlayer::XRQuadLayer;
use crate::dom::xrsession::XRSession;
use crate::dom::xrview::XRView;
use crate::dom::xrwebglsubimage::XRWebGLSubImage;
use crate::script_runtime::CanGc;

#[dom_struct]
pub struct XRWebGLBinding {
    reflector: Reflector,
    session: Dom<XRSession>,
    context: Dom<WebGLRenderingContext>,
}

impl XRWebGLBinding {
    pub fn new_inherited(session: &XRSession, context: &WebGLRenderingContext) -> XRWebGLBinding {
        XRWebGLBinding {
            reflector: Reflector::new(),
            session: Dom::from_ref(session),
            context: Dom::from_ref(context),
        }
    }

    fn new(
        global: &Window,
        proto: Option<HandleObject>,
        session: &XRSession,
        context: &WebGLRenderingContext,
        can_gc: CanGc,
    ) -> DomRoot<XRWebGLBinding> {
        reflect_dom_object_with_proto(
            Box::new(XRWebGLBinding::new_inherited(session, context)),
            global,
            proto,
            can_gc,
        )
    }
}

impl XRWebGLBindingMethods<crate::DomTypeHolder> for XRWebGLBinding {
    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-xrwebglbinding>
    fn Constructor(
        global: &Window,
        proto: Option<HandleObject>,
        can_gc: CanGc,
        session: &XRSession,
        context: WebGLRenderingContextOrWebGL2RenderingContext,
    ) -> Fallible<DomRoot<XRWebGLBinding>> {
        let context = match context {
            WebGLRenderingContextOrWebGL2RenderingContext::WebGLRenderingContext(ctx) => ctx,
            WebGLRenderingContextOrWebGL2RenderingContext::WebGL2RenderingContext(ctx) => {
                ctx.base_context()
            },
        };
        // Step 2
        if session.is_ended() {
            return Err(Error::InvalidState);
        }

        // step 3
        if context.IsContextLost() {
            return Err(Error::InvalidState);
        }

        // Step 4
        if !session.is_immersive() {
            return Err(Error::InvalidState);
        };

        // Step 5 throw an InvalidStateError If context’s XR compatible boolean is false.

        Ok(XRWebGLBinding::new(
            global, proto, session, &context, can_gc,
        ))
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-createprojectionlayer>
    fn CreateProjectionLayer(
        &self,
        _: XRTextureType,
        _: &XRProjectionLayerInit,
    ) -> Fallible<DomRoot<XRProjectionLayer>> {
        // https://github.com/servo/servo/issues/27468
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-createquadlayer>
    fn CreateQuadLayer(
        &self,
        _: XRTextureType,
        _: &Option<XRQuadLayerInit>,
    ) -> Fallible<DomRoot<XRQuadLayer>> {
        // https://github.com/servo/servo/issues/27493
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-createcylinderlayer>
    fn CreateCylinderLayer(
        &self,
        _: XRTextureType,
        _: &Option<XRCylinderLayerInit>,
    ) -> Fallible<DomRoot<XRCylinderLayer>> {
        // https://github.com/servo/servo/issues/27493
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-createequirectlayer>
    fn CreateEquirectLayer(
        &self,
        _: XRTextureType,
        _: &Option<XREquirectLayerInit>,
    ) -> Fallible<DomRoot<XREquirectLayer>> {
        // https://github.com/servo/servo/issues/27493
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-createcubelayer>
    fn CreateCubeLayer(&self, _: &Option<XRCubeLayerInit>) -> Fallible<DomRoot<XRCubeLayer>> {
        // https://github.com/servo/servo/issues/27493
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-getsubimage>
    fn GetSubImage(
        &self,
        _: &XRCompositionLayer,
        _: &XRFrame,
        _: XREye,
    ) -> Fallible<DomRoot<XRWebGLSubImage>> {
        // https://github.com/servo/servo/issues/27468
        Err(Error::NotSupported)
    }

    /// <https://immersive-web.github.io/layers/#dom-xrwebglbinding-getviewsubimage>
    fn GetViewSubImage(
        &self,
        _: &XRProjectionLayer,
        _: &XRView,
    ) -> Fallible<DomRoot<XRWebGLSubImage>> {
        // https://github.com/servo/servo/issues/27468
        Err(Error::NotSupported)
    }
}