#!/usr/bin/env python
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import argparse
import sys
from builtins import range
from ctypes import *

import numpy as np
import tritonclient.grpc as grpcclient
import tritonclient.utils.cuda_shared_memory as cudashm
from tritonclient import utils

FLAGS = None

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-v",
        "--verbose",
        action="store_true",
        required=False,
        default=False,
        help="Enable verbose output",
    )
    parser.add_argument(
        "-u",
        "--url",
        type=str,
        required=False,
        default="localhost:8001",
        help="Inference server URL. Default is localhost:8001.",
    )

    FLAGS = parser.parse_args()

    try:
        triton_client = grpcclient.InferenceServerClient(
            url=FLAGS.url, verbose=FLAGS.verbose
        )
    except Exception as e:
        print("channel creation failed: " + str(e))
        sys.exit(1)

    # To make sure no shared memory regions are registered with the
    # server.
    triton_client.unregister_system_shared_memory()
    triton_client.unregister_cuda_shared_memory()

    # We use a simple model that takes 2 input tensors of 16 integers
    # each and returns 2 output tensors of 16 integers each. One
    # output tensor is the element-wise sum of the inputs and one
    # output is the element-wise difference.
    model_name = "simple"
    model_version = ""

    # Create the data for the two input tensors. Initialize the first
    # to unique integers and the second to all ones.
    input0_data = np.arange(start=0, stop=16, dtype=np.int32)
    input1_data = np.ones(shape=16, dtype=np.int32)

    input_byte_size = input0_data.size * input0_data.itemsize
    output_byte_size = input_byte_size

    # Create Output0 and Output1 in Shared Memory and store shared memory handles
    shm_op0_handle = cudashm.create_shared_memory_region(
        "output0_data", output_byte_size, 0
    )
    shm_op1_handle = cudashm.create_shared_memory_region(
        "output1_data", output_byte_size, 0
    )

    # Register Output0 and Output1 shared memory with Triton Server
    triton_client.register_cuda_shared_memory(
        "output0_data", cudashm.get_raw_handle(shm_op0_handle), 0, output_byte_size
    )
    triton_client.register_cuda_shared_memory(
        "output1_data", cudashm.get_raw_handle(shm_op1_handle), 0, output_byte_size
    )

    # Create Input0 and Input1 in Shared Memory and store shared memory handles
    shm_ip0_handle = cudashm.create_shared_memory_region(
        "input0_data", input_byte_size, 0
    )
    shm_ip1_handle = cudashm.create_shared_memory_region(
        "input1_data", input_byte_size, 0
    )

    # Put input data values into shared memory
    cudashm.set_shared_memory_region(shm_ip0_handle, [input0_data])
    cudashm.set_shared_memory_region(shm_ip1_handle, [input1_data])

    # Register Input0 and Input1 shared memory with Triton Server
    triton_client.register_cuda_shared_memory(
        "input0_data", cudashm.get_raw_handle(shm_ip0_handle), 0, input_byte_size
    )
    triton_client.register_cuda_shared_memory(
        "input1_data", cudashm.get_raw_handle(shm_ip1_handle), 0, input_byte_size
    )

    # Set the parameters to use data from shared memory
    inputs = []
    inputs.append(grpcclient.InferInput("INPUT0", [1, 16], "INT32"))
    inputs[-1].set_shared_memory("input0_data", input_byte_size)

    inputs.append(grpcclient.InferInput("INPUT1", [1, 16], "INT32"))
    inputs[-1].set_shared_memory("input1_data", input_byte_size)

    outputs = []
    outputs.append(grpcclient.InferRequestedOutput("OUTPUT0"))
    outputs[-1].set_shared_memory("output0_data", output_byte_size)

    outputs.append(grpcclient.InferRequestedOutput("OUTPUT1"))
    outputs[-1].set_shared_memory("output1_data", output_byte_size)

    results = triton_client.infer(model_name=model_name, inputs=inputs, outputs=outputs)

    # Read results from the shared memory.
    output0 = results.get_output("OUTPUT0")
    if output0 is not None:
        output0_data = cudashm.get_contents_as_numpy(
            shm_op0_handle, utils.triton_to_np_dtype(output0.datatype), output0.shape
        )
    else:
        print("OUTPUT0 is missing in the response.")
        sys.exit(1)

    output1 = results.get_output("OUTPUT1")
    if output1 is not None:
        output1_data = cudashm.get_contents_as_numpy(
            shm_op1_handle, utils.triton_to_np_dtype(output1.datatype), output1.shape
        )
    else:
        print("OUTPUT1 is missing in the response.")
        sys.exit(1)

    for i in range(16):
        print(
            str(input0_data[i])
            + " + "
            + str(input1_data[i])
            + " = "
            + str(output0_data[0][i])
        )
        print(
            str(input0_data[i])
            + " - "
            + str(input1_data[i])
            + " = "
            + str(output1_data[0][i])
        )
        if (input0_data[i] + input1_data[i]) != output0_data[0][i]:
            print("cudashm infer error: incorrect sum")
            sys.exit(1)
        if (input0_data[i] - input1_data[i]) != output1_data[0][i]:
            print("cudashm infer error: incorrect difference")
            sys.exit(1)

    print(triton_client.get_cuda_shared_memory_status())
    triton_client.unregister_cuda_shared_memory()
    assert len(cudashm.allocated_shared_memory_regions()) == 4
    cudashm.destroy_shared_memory_region(shm_ip0_handle)
    cudashm.destroy_shared_memory_region(shm_ip1_handle)
    cudashm.destroy_shared_memory_region(shm_op0_handle)
    cudashm.destroy_shared_memory_region(shm_op1_handle)
    assert len(cudashm.allocated_shared_memory_regions()) == 0

    print("PASS: cudashm")