use super::prelude::*;

impl<PS: PrecisionSettings> NodeCodegen<PS> for onnx_ir::node::or::OrNode {
    fn inputs(&self) -> &[Argument] {
        &self.inputs
    }

    fn outputs(&self) -> &[Argument] {
        &self.outputs
    }

    fn forward(&self, scope: &mut ScopeAtPosition<'_>) -> TokenStream {
        let lhs = self.inputs.first().unwrap();
        let rhs = self.inputs.get(1).unwrap();
        let output = arg_to_ident(self.outputs.first().unwrap());

        let lhs_value = scope.arg(lhs);

        let rhs_value = scope.arg(rhs);

        let function = match (&lhs.ty, &rhs.ty) {
            (ArgType::Tensor(lhs_tensor), ArgType::Tensor(rhs_tensor)) => {
                let lhs_rank = lhs_tensor.rank;
                let rhs_rank = rhs_tensor.rank;

                if lhs_rank == rhs_rank {
                    quote! { #lhs_value.bool_or(#rhs_value) }
                } else if lhs_rank > rhs_rank {
                    let num_dims = lhs_rank - rhs_rank;
                    let dims: Vec<isize> = (0..num_dims).map(|i| i as isize).collect();
                    quote! { #lhs_value.bool_or(#rhs_value.unsqueeze_dims(&[#(#dims),*])) }
                } else {
                    let num_dims = rhs_rank - lhs_rank;
                    let dims: Vec<isize> = (0..num_dims).map(|i| i as isize).collect();
                    quote! { #lhs_value.unsqueeze_dims(&[#(#dims),*]).bool_or(#rhs_value) }
                }
            }
            (ArgType::Scalar(_), ArgType::Scalar(_)) => {
                quote! { #lhs_value || #rhs_value }
            }
            _ => panic!("Or operation requires tensor or scalar inputs"),
        };

        quote! {
            let #output = #function;
        }
    }
}

#[cfg(test)]
mod tests {
    use super::super::test_helpers::*;
    use burn::tensor::DType;
    use insta::assert_snapshot;
    use onnx_ir::node::or::OrNodeBuilder;

    #[test]
    fn test_or_forward() {
        let node = OrNodeBuilder::new("or1")
            .input_tensor("lhs", 2, DType::Bool)
            .input_tensor("rhs", 2, DType::Bool)
            .output_tensor("output", 2, DType::Bool)
            .build();
        let code = codegen_forward_default(&node);
        assert_snapshot!(code, @r"
        pub fn forward(
            &self,
            lhs: Tensor<B, 2, Bool>,
            rhs: Tensor<B, 2, Bool>,
        ) -> Tensor<B, 2, Bool> {
            let output = lhs.bool_or(rhs);
            output
        }
        ");
    }
}
