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

import numpy as np
import tritonclient.grpc as grpcclient
import tritonclient.grpc.model_config_pb2 as model_config
import tritonclient.http as httpclient
from tritonclient.utils import InferenceServerException

FLAGS = None


def parse_model_grpc(model_metadata, model_config):
    """
    Check the configuration of a model to make sure it meets the
    requirements for an image classification network (as expected by
    this client)
    """
    if len(model_metadata.inputs) != 1:
        raise Exception("expecting 1 input, got {}".format(len(model_metadata.inputs)))

    if len(model_config.input) != 1:
        raise Exception(
            "expecting 1 input in model configuration, got {}".format(
                len(model_config.input)
            )
        )

    input_metadata = model_metadata.inputs[0]
    output_metadata = model_metadata.outputs

    return (input_metadata.name, output_metadata, model_config.max_batch_size)


def parse_model_http(model_metadata, model_config):
    """
    Check the configuration of a model to make sure it meets the
    requirements for an image classification network (as expected by
    this client)
    """
    if len(model_metadata["inputs"]) != 1:
        raise Exception(
            "expecting 1 input, got {}".format(len(model_metadata["inputs"]))
        )

    if len(model_config["input"]) != 1:
        raise Exception(
            "expecting 1 input in model configuration, got {}".format(
                len(model_config["input"])
            )
        )

    input_metadata = model_metadata["inputs"][0]
    output_metadata = model_metadata["outputs"]

    return (input_metadata["name"], output_metadata, model_config["max_batch_size"])


def postprocess(results, output_names, filenames, batch_size):
    """
    Post-process results to show classifications.
    """
    output_dict = {}
    for output_name in output_names:
        output_dict[output_name] = results.as_numpy(output_name)
        if len(output_dict[output_name]) != batch_size:
            raise Exception(
                "expected {} results for output {}, got {}".format(
                    batch_size, output_name, len(output_dict[output_name])
                )
            )

    for n, f in enumerate(filenames):
        print('\n"{}":'.format(f))
        for output_name in output_names:
            print("  [{}]:".format(output_name))
            for result in output_dict[output_name][n]:
                if output_dict[output_name][n].dtype.type == np.object_:
                    cls = "".join(chr(x) for x in result).split(":")
                else:
                    cls = result.split(":")
                print("    {} ({}) = {}".format(cls[0], cls[1], cls[2]))


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(
        "-m",
        "--model-name",
        type=str,
        required=False,
        default="preprocess_inception_ensemble",
        help="Name of model. Default is preprocess_inception_ensemble.",
    )
    parser.add_argument(
        "-c",
        "--classes",
        type=int,
        required=False,
        default=1,
        help="Number of class results to report. Default is 1.",
    )
    parser.add_argument(
        "-u",
        "--url",
        type=str,
        required=False,
        default="localhost:8000",
        help="Inference server URL. Default is localhost:8000.",
    )
    parser.add_argument(
        "-i",
        "--protocol",
        type=str,
        required=False,
        default="HTTP",
        help="Protocol (HTTP/gRPC) used to "
        + "communicate with inference service. Default is HTTP.",
    )
    parser.add_argument(
        "image_filename",
        type=str,
        nargs="?",
        default=None,
        help="Input image / Input folder.",
    )
    FLAGS = parser.parse_args()

    protocol = FLAGS.protocol.lower()

    try:
        if protocol == "grpc":
            # Create gRPC client for communicating with the server
            triton_client = grpcclient.InferenceServerClient(
                url=FLAGS.url, verbose=FLAGS.verbose
            )
        else:
            # Create HTTP client for communicating with the server
            triton_client = httpclient.InferenceServerClient(
                url=FLAGS.url, verbose=FLAGS.verbose
            )
    except Exception as e:
        print("client creation failed: " + str(e))
        sys.exit(1)

    model_name = FLAGS.model_name

    # Make sure the model matches our requirements, and get some
    # properties of the model that we need for preprocessing
    try:
        model_metadata = triton_client.get_model_metadata(model_name=model_name)
    except InferenceServerException as e:
        print("failed to retrieve the metadata: " + str(e))
        sys.exit(1)

    try:
        model_config = triton_client.get_model_config(model_name=model_name)
    except InferenceServerException as e:
        print("failed to retrieve the config: " + str(e))
        sys.exit(1)

    if FLAGS.protocol.lower() == "grpc":
        input_name, output_metadata, batch_size = parse_model_grpc(
            model_metadata, model_config.config
        )
    else:
        input_name, output_metadata, batch_size = parse_model_http(
            model_metadata, model_config
        )

    filenames = []
    if os.path.isdir(FLAGS.image_filename):
        filenames = [
            os.path.join(FLAGS.image_filename, f)
            for f in os.listdir(FLAGS.image_filename)
            if os.path.isfile(os.path.join(FLAGS.image_filename, f))
        ]
    else:
        filenames = [
            FLAGS.image_filename,
        ]

    filenames.sort()

    # Set batch size to the smaller value of image size and max batch size
    if len(filenames) <= batch_size:
        batch_size = len(filenames)
    else:
        print(
            "The number of images exceeds maximum batch size,"
            "only the first {} images, sorted by name alphabetically,"
            " will be processed".format(batch_size)
        )

    # Preprocess the images into input data according to model
    # requirements
    image_data = []
    for idx in range(batch_size):
        with open(filenames[idx], "rb") as fd:
            image_data.append(np.array([fd.read()], dtype=bytes))

    # Send requests of batch_size images.
    input_filenames = []
    repeated_image_data = []
    for idx in range(batch_size):
        input_filenames.append(filenames[idx])
        repeated_image_data.append(image_data[idx])

    batched_image_data = np.stack(repeated_image_data, axis=0)

    # Set the input data
    inputs = []
    if FLAGS.protocol.lower() == "grpc":
        inputs.append(
            grpcclient.InferInput(input_name, batched_image_data.shape, "BYTES")
        )
        inputs[0].set_data_from_numpy(batched_image_data)
    else:
        inputs.append(
            httpclient.InferInput(input_name, batched_image_data.shape, "BYTES")
        )
        inputs[0].set_data_from_numpy(batched_image_data, binary_data=True)

    output_names = [
        output.name if FLAGS.protocol.lower() == "grpc" else output["name"]
        for output in output_metadata
    ]

    outputs = []
    for output_name in output_names:
        if FLAGS.protocol.lower() == "grpc":
            outputs.append(
                grpcclient.InferRequestedOutput(output_name, class_count=FLAGS.classes)
            )
        else:
            outputs.append(
                httpclient.InferRequestedOutput(
                    output_name, binary_data=True, class_count=FLAGS.classes
                )
            )

    # Send request
    result = triton_client.infer(model_name, inputs, outputs=outputs)

    postprocess(result, output_names, input_filenames, batch_size)

    print("PASS")