import sys

import torch

from config import config
from style_bert_vits2.constants import Languages
from style_bert_vits2.text_processing import bert_models
from style_bert_vits2.text_processing.japanese.g2p import text_to_sep_kata


models = dict()


def get_bert_feature(
    text: str,
    word2ph,
    device = config.bert_gen_config.device,
    assist_text: str | None = None,
    assist_text_weight: float = 0.7,
):
    # 各単語が何文字かを作る`word2ph`を使う必要があるので、読めない文字は必ず無視する
    # でないと`word2ph`の結果とテキストの文字数結果が整合性が取れない
    text = "".join(text_to_sep_kata(text, raise_yomi_error=False)[0])

    if assist_text:
        assist_text = "".join(text_to_sep_kata(assist_text, raise_yomi_error=False)[0])
    if (
        sys.platform == "darwin"
        and torch.backends.mps.is_available()
        and device == "cpu"
    ):
        device = "mps"
    if not device:
        device = "cuda"
    if device == "cuda" and not torch.cuda.is_available():
        device = "cpu"
    if device not in models.keys():
        models[device] = bert_models.load_model(Languages.JP).to(device)
    with torch.no_grad():
        tokenizer = bert_models.load_tokenizer(Languages.JP)
        inputs = tokenizer(text, return_tensors="pt")
        for i in inputs:
            inputs[i] = inputs[i].to(device)
        res = models[device](**inputs, output_hidden_states=True)
        res = torch.cat(res["hidden_states"][-3:-2], -1)[0].cpu()
        if assist_text:
            style_inputs = tokenizer(assist_text, return_tensors="pt")
            for i in style_inputs:
                style_inputs[i] = style_inputs[i].to(device)
            style_res = models[device](**style_inputs, output_hidden_states=True)
            style_res = torch.cat(style_res["hidden_states"][-3:-2], -1)[0].cpu()
            style_res_mean = style_res.mean(0)

    assert len(word2ph) == len(text) + 2, text
    word2phone = word2ph
    phone_level_feature = []
    for i in range(len(word2phone)):
        if assist_text:
            repeat_feature = (
                res[i].repeat(word2phone[i], 1) * (1 - assist_text_weight)
                + style_res_mean.repeat(word2phone[i], 1) * assist_text_weight
            )
        else:
            repeat_feature = res[i].repeat(word2phone[i], 1)
        phone_level_feature.append(repeat_feature)

    phone_level_feature = torch.cat(phone_level_feature, dim=0)

    return phone_level_feature.T