# Copyright (c) 2021 Mobvoi Inc. (authors: Binbin Zhang)
#               2024 Alibaba Inc (authors: Xiang Lyu, Zetao Hu)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json
import torchaudio
import logging
logging.getLogger('matplotlib').setLevel(logging.WARNING)
logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(levelname)s %(message)s')


def read_lists(list_file):
    lists = []
    with open(list_file, 'r', encoding='utf8') as fin:
        for line in fin:
            lists.append(line.strip())
    return lists


def read_json_lists(list_file):
    lists = read_lists(list_file)
    results = {}
    for fn in lists:
        with open(fn, 'r', encoding='utf8') as fin:
            results.update(json.load(fin))
    return results


def load_wav(wav, target_sr):
    speech, sample_rate = torchaudio.load(wav, backend='soundfile')
    speech = speech.mean(dim=0, keepdim=True)
    if sample_rate != target_sr:
        assert sample_rate > target_sr, 'wav sample rate {} must be greater than {}'.format(sample_rate, target_sr)
        speech = torchaudio.transforms.Resample(orig_freq=sample_rate, new_freq=target_sr)(speech)
    return speech


def convert_onnx_to_trt(trt_model, onnx_model, fp16):
    import tensorrt as trt
    _min_shape = [(2, 80, 4), (2, 1, 4), (2, 80, 4), (2,), (2, 80), (2, 80, 4)]
    _opt_shape = [(2, 80, 193), (2, 1, 193), (2, 80, 193), (2,), (2, 80), (2, 80, 193)]
    _max_shape = [(2, 80, 6800), (2, 1, 6800), (2, 80, 6800), (2,), (2, 80), (2, 80, 6800)]
    input_names = ["x", "mask", "mu", "t", "spks", "cond"]

    logging.info("Converting onnx to trt...")
    network_flags = 1 << int(trt.NetworkDefinitionCreationFlag.EXPLICIT_BATCH)
    logger = trt.Logger(trt.Logger.INFO)
    builder = trt.Builder(logger)
    network = builder.create_network(network_flags)
    parser = trt.OnnxParser(network, logger)
    config = builder.create_builder_config()
    config.set_memory_pool_limit(trt.MemoryPoolType.WORKSPACE, 1 << 33)  # 8GB
    if fp16:
        config.set_flag(trt.BuilderFlag.FP16)
    profile = builder.create_optimization_profile()
    # load onnx model
    with open(onnx_model, "rb") as f:
        if not parser.parse(f.read()):
            for error in range(parser.num_errors):
                print(parser.get_error(error))
            raise ValueError('failed to parse {}'.format(onnx_model))
    # set input shapes
    for i in range(len(input_names)):
        profile.set_shape(input_names[i], _min_shape[i], _opt_shape[i], _max_shape[i])
    tensor_dtype = trt.DataType.HALF if fp16 else trt.DataType.FLOAT
    # set input and output data type
    for i in range(network.num_inputs):
        input_tensor = network.get_input(i)
        input_tensor.dtype = tensor_dtype
    for i in range(network.num_outputs):
        output_tensor = network.get_output(i)
        output_tensor.dtype = tensor_dtype
    config.add_optimization_profile(profile)
    engine_bytes = builder.build_serialized_network(network, config)
    # save trt engine
    with open(trt_model, "wb") as f:
        f.write(engine_bytes)
