# Copyright (c) 2021 Mobvoi Inc. (authors: Binbin Zhang)
#               2024 Alibaba Inc (authors: Xiang Lyu, Zetao Hu)
#               2025 Alibaba Inc (authors: Xiang Lyu, Yabin Li)
#
# 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 os
import json
import torch
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, trt_kwargs, onnx_model, fp16):
    import tensorrt as trt
    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 << 32)  # 4GB
    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(trt_kwargs['input_names'])):
        profile.set_shape(trt_kwargs['input_names'][i], trt_kwargs['min_shape'][i], trt_kwargs['opt_shape'][i], trt_kwargs['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)
    logging.info("Succesfully convert onnx to trt...")


def export_cosyvoice2_vllm(model, model_path, device):
    if os.path.exists(model_path):
        return
    pad_to = DEFAULT_VOCAB_PADDING_SIZE = 64
    vocab_size = model.speech_embedding.num_embeddings
    feature_size = model.speech_embedding.embedding_dim
    pad_vocab_size = ((vocab_size + pad_to - 1) // pad_to) * pad_to

    dtype = torch.bfloat16
    # lm_head
    new_lm_head = torch.nn.Linear(in_features=feature_size, out_features=pad_vocab_size, bias=True)
    with torch.no_grad():
        new_lm_head.weight[:vocab_size] = model.llm_decoder.weight
        new_lm_head.bias[:vocab_size] = model.llm_decoder.bias
        new_lm_head.weight[vocab_size:] = 0
        new_lm_head.bias[vocab_size:] = 0
    model.llm.model.lm_head = new_lm_head
    new_codec_embed = torch.nn.Linear(in_features=feature_size, out_features=pad_vocab_size)
    # embed_tokens
    embed_tokens = model.llm.model.model.embed_tokens
    with torch.no_grad():
        new_codec_embed.weight[:vocab_size] = model.speech_embedding.weight
        new_codec_embed.weight[vocab_size:] = 0
    model.llm.model.set_input_embeddings(new_codec_embed)
    model.llm.model.to(device)
    model.llm.model.to(dtype)
    tmp_vocab_size = model.llm.model.config.vocab_size
    tmp_tie_embedding = model.llm.model.config.tie_word_embeddings
    del model.llm.model.generation_config.eos_token_id
    del model.llm.model.config.bos_token_id
    del model.llm.model.config.eos_token_id
    model.llm.model.config.vocab_size = pad_vocab_size
    model.llm.model.config.tie_word_embeddings = False
    model.llm.model.config.use_bias = True
    model.llm.model.save_pretrained(model_path)
    os.system('sed -i s@Qwen2ForCausalLM@CosyVoice2ForCausalLM@g {}/config.json'.format(os.path.abspath(model_path)))
    model.llm.model.config.vocab_size = tmp_vocab_size
    model.llm.model.config.tie_word_embeddings = tmp_tie_embedding
    model.llm.model.set_input_embeddings(embed_tokens)