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import hipdnn
import torch


def build_layernorm_inference_graph(
    hipdnn_handle,
    torch_tensor_x,
    torch_tensor_scale,
    torch_tensor_bias,
    torch_tensor_epsilon,
    hipdnn_data_type,
):
    # Create graph
    graph = hipdnn.pygraph(
        handle=hipdnn_handle,
        io_data_type=hipdnn_data_type,
        intermediate_data_type=hipdnn.data_type.FLOAT,
        compute_data_type=hipdnn.data_type.FLOAT,
        name="layernorm_inference",
    )

    # Create hipdnn tensors
    hipdnn_tensor_x = graph.tensor_like(torch_tensor_x)
    hipdnn_tensor_scale = graph.tensor_like(torch_tensor_scale)
    hipdnn_tensor_bias = graph.tensor_like(torch_tensor_bias)
    hipdnn_tensor_epsilon = graph.tensor_like(torch_tensor_epsilon)

    # Create layernorm op
    hipdnn_tensor_y, hipdnn_tensor_mean, hipdnn_tensor_inv_var = graph.layernorm(
        norm_forward_phase=hipdnn.norm_forward_phase.INFERENCE,
        input=hipdnn_tensor_x,
        scale=hipdnn_tensor_scale,
        bias=hipdnn_tensor_bias,
        epsilon=hipdnn_tensor_epsilon,
        name="layernorm",
    )
    hipdnn_tensor_y.set_output(True)
    graph.build(hipdnn_handle)

    return (
        graph,
        hipdnn_tensor_x,
        hipdnn_tensor_scale,
        hipdnn_tensor_bias,
        hipdnn_tensor_epsilon,
        hipdnn_tensor_y,
    )


if __name__ == "__main__":
    # Input dimensions
    batch, seq_len, embedding_dim = 2, 1024, 768

    hipdnn_data_type = hipdnn.data_type.FLOAT
    torch_data_type = torch.float32

    torch_tensor_x = torch.rand(batch, seq_len, embedding_dim, dtype=torch_data_type, device="cuda")
    torch_tensor_scale = torch.rand(embedding_dim, dtype=torch_data_type, device="cuda")
    torch_tensor_bias = torch.rand(embedding_dim, dtype=torch_data_type, device="cuda")
    torch_tensor_epsilon = torch.full(
        (1, 1, 1, 1), 1e-5, dtype=torch.float32, requires_grad=False, device="cpu"
    )

    hipdnn_handle = hipdnn.create_handle()

    (
        graph,
        hipdnn_tensor_x,
        hipdnn_tensor_scale,
        hipdnn_tensor_bias,
        hipdnn_tensor_epsilon,
        hipdnn_tensor_y,
    ) = build_layernorm_inference_graph(
        hipdnn_handle,
        torch_tensor_x,
        torch_tensor_scale,
        torch_tensor_bias,
        torch_tensor_epsilon,
        hipdnn_data_type,
    )

    torch_tensor_y = torch.empty(hipdnn_tensor_y.get_dim(), dtype=torch_data_type, device="cuda")
    variant_pack = {
        hipdnn_tensor_x: torch_tensor_x.data_ptr(),
        hipdnn_tensor_scale: torch_tensor_scale.data_ptr(),
        hipdnn_tensor_bias: torch_tensor_bias.data_ptr(),
        hipdnn_tensor_y: torch_tensor_y.data_ptr(),
    }
    workspace = torch.empty(graph.get_workspace_size(), dtype=torch.uint8, device="cuda")

    graph.exec(variant_pack=variant_pack, workspace=workspace.data_ptr())
    print("layernorm inference graph execution complete.")