import gc
import logging
from typing import Union

import numpy as np
import torch

from modules import config, models
from modules.devices import devices
from modules.speaker import Speaker
from modules.utils.cache import conditional_cache
from modules.utils.SeedContext import SeedContext

logger = logging.getLogger(__name__)


def generate_audio(
    text: str,
    temperature: float = 0.3,
    top_P: float = 0.7,
    top_K: float = 20,
    spk: Union[int, Speaker] = -1,
    infer_seed: int = -1,
    use_decoder: bool = True,
    prompt1: str = "",
    prompt2: str = "",
    prefix: str = "",
):
    (sample_rate, wav) = generate_audio_batch(
        [text],
        temperature=temperature,
        top_P=top_P,
        top_K=top_K,
        spk=spk,
        infer_seed=infer_seed,
        use_decoder=use_decoder,
        prompt1=prompt1,
        prompt2=prompt2,
        prefix=prefix,
    )[0]

    return (sample_rate, wav)


@torch.inference_mode()
def generate_audio_batch(
    texts: list[str],
    temperature: float = 0.3,
    top_P: float = 0.7,
    top_K: float = 20,
    spk: Union[int, Speaker] = -1,
    infer_seed: int = -1,
    use_decoder: bool = True,
    prompt1: str = "",
    prompt2: str = "",
    prefix: str = "",
):
    chat_tts = models.load_chat_tts()
    params_infer_code = {
        "spk_emb": None,
        "temperature": temperature,
        "top_P": top_P,
        "top_K": top_K,
        "prompt1": prompt1 or "",
        "prompt2": prompt2 or "",
        "prefix": prefix or "",
        "repetition_penalty": 1.0,
        "disable_tqdm": config.runtime_env_vars.off_tqdm,
    }

    if isinstance(spk, int):
        with SeedContext(spk, True):
            params_infer_code["spk_emb"] = chat_tts.sample_random_speaker()
        logger.debug(("spk", spk))
    elif isinstance(spk, Speaker):
        if not isinstance(spk.emb, torch.Tensor):
            raise ValueError("spk.pt is broken, please retrain the model.")
        params_infer_code["spk_emb"] = spk.emb
        logger.debug(("spk", spk.name))
    else:
        logger.warn(
            f"spk must be int or Speaker, but: <{type(spk)}> {spk}, wiil set to default voice"
        )
        with SeedContext(2, True):
            params_infer_code["spk_emb"] = chat_tts.sample_random_speaker()

    logger.debug(
        {
            "text": texts,
            "infer_seed": infer_seed,
            "temperature": temperature,
            "top_P": top_P,
            "top_K": top_K,
            "prompt1": prompt1 or "",
            "prompt2": prompt2 or "",
            "prefix": prefix or "",
        }
    )

    with SeedContext(infer_seed, True):
        wavs = chat_tts.generate_audio(
            texts, params_infer_code, use_decoder=use_decoder
        )

    sample_rate = 24000

    if config.auto_gc:
        devices.torch_gc()
        gc.collect()

    return [(sample_rate, np.array(wav).flatten().astype(np.float32)) for wav in wavs]


lru_cache_enabled = False


def setup_lru_cache():
    global generate_audio_batch
    global lru_cache_enabled

    if lru_cache_enabled:
        return
    lru_cache_enabled = True

    def should_cache(*args, **kwargs):
        spk_seed = kwargs.get("spk", -1)
        infer_seed = kwargs.get("infer_seed", -1)
        return spk_seed != -1 and infer_seed != -1

    lru_size = config.runtime_env_vars.lru_size
    if isinstance(lru_size, int):
        generate_audio_batch = conditional_cache(lru_size, should_cache)(
            generate_audio_batch
        )
        logger.info(f"LRU cache enabled with size {lru_size}")
    else:
        logger.debug(f"LRU cache failed to enable, invalid size {lru_size}")


if __name__ == "__main__":
    import soundfile as sf

    # 测试batch生成
    inputs = ["你好[lbreak]", "再见[lbreak]", "长度不同的文本片段[lbreak]"]
    outputs = generate_audio_batch(inputs, spk=5, infer_seed=42)

    for i, (sample_rate, wav) in enumerate(outputs):
        print(i, sample_rate, wav.shape)

        sf.write(f"batch_{i}.wav", wav, sample_rate, format="wav")

    # 单独生成
    for i, text in enumerate(inputs):
        sample_rate, wav = generate_audio(text, spk=5, infer_seed=42)
        print(i, sample_rate, wav.shape)

        sf.write(f"one_{i}.wav", wav, sample_rate, format="wav")