# -*- encoding: utf-8 -*-

import os.path
from pathlib import Path
from typing import List, Union, Tuple
import numpy as np

from .utils.utils import (ONNXRuntimeError,
                          OrtInferSession, get_logger,
                          read_yaml)
from .utils.preprocessor import CodeMixTokenizerCommonPreprocessor
from .utils.utils import split_to_mini_sentence
logging = get_logger()


class TargetDelayTransformer():
    def __init__(self, model_dir: Union[str, Path] = None,
                 batch_size: int = 1,
                 device_id: Union[str, int] = "-1",
                 quantize: bool = False,
                 intra_op_num_threads: int = 4
                 ):

        if not Path(model_dir).exists():
            raise FileNotFoundError(f'{model_dir} does not exist.')

        model_file = os.path.join(model_dir, 'model.onnx')
        if quantize:
            model_file = os.path.join(model_dir, 'model_quant.onnx')
        config_file = os.path.join(model_dir, 'punc.yaml')
        config = read_yaml(config_file)

        self.ort_infer = OrtInferSession(model_file, device_id, intra_op_num_threads=intra_op_num_threads)
        self.batch_size = 1
        self.punc_list = config['punc_list']
        self.period = 0
        for i in range(len(self.punc_list)):
            if self.punc_list[i] == ",":
                self.punc_list[i] = "，"
            elif self.punc_list[i] == "?":
                self.punc_list[i] = "？"
            elif self.punc_list[i] == "。":
                self.period = i
        self.preprocessor = CodeMixTokenizerCommonPreprocessor(
            train=False,
            token_type=config['token_type'],
            token_list=config['token_list'],
            bpemodel=config['bpemodel'],
            text_cleaner=config['cleaner'],
            g2p_type=config['g2p'],
            text_name="text",
            non_linguistic_symbols=config['non_linguistic_symbols'],
        )

    def __call__(self, text: Union[list, str], split_size=20):
        data = {"text": text}
        result = self.preprocessor(data=data, uid="12938712838719")
        split_text = self.preprocessor.pop_split_text_data(result)
        mini_sentences = split_to_mini_sentence(split_text, split_size)
        mini_sentences_id = split_to_mini_sentence(data["text"], split_size)
        assert len(mini_sentences) == len(mini_sentences_id)
        cache_sent = []
        cache_sent_id = []
        new_mini_sentence = ""
        new_mini_sentence_punc = []
        cache_pop_trigger_limit = 200
        for mini_sentence_i in range(len(mini_sentences)):
            mini_sentence = mini_sentences[mini_sentence_i]
            mini_sentence_id = mini_sentences_id[mini_sentence_i]
            mini_sentence = cache_sent + mini_sentence
            mini_sentence_id = np.concatenate((cache_sent_id, mini_sentence_id), axis=0)
            data = {
                "text": mini_sentence_id[None,:].astype(np.int64),
                "text_lengths": np.array([len(mini_sentence_id)], dtype='int32'),
            }
            try:
                outputs = self.infer(data['text'], data['text_lengths'])
                y = outputs[0]
                punctuations = np.argmax(y,axis=-1)[0]
                assert punctuations.size == len(mini_sentence)
            except ONNXRuntimeError:
                logging.warning("error")

            # Search for the last Period/QuestionMark as cache
            if mini_sentence_i < len(mini_sentences) - 1:
                sentenceEnd = -1
                last_comma_index = -1
                for i in range(len(punctuations) - 2, 1, -1):
                    if self.punc_list[punctuations[i]] == "。" or self.punc_list[punctuations[i]] == "？":
                        sentenceEnd = i
                        break
                    if last_comma_index < 0 and self.punc_list[punctuations[i]] == "，":
                        last_comma_index = i

                if sentenceEnd < 0 and len(mini_sentence) > cache_pop_trigger_limit and last_comma_index >= 0:
                    # The sentence it too long, cut off at a comma.
                    sentenceEnd = last_comma_index
                    punctuations[sentenceEnd] = self.period
                cache_sent = mini_sentence[sentenceEnd + 1:]
                cache_sent_id = mini_sentence_id[sentenceEnd + 1:]
                mini_sentence = mini_sentence[0:sentenceEnd + 1]
                punctuations = punctuations[0:sentenceEnd + 1]

            punctuations_np = punctuations.cpu().numpy()
            new_mini_sentence_punc += [int(x) for x in punctuations_np]
            words_with_punc = []
            for i in range(len(mini_sentence)):
                if i > 0:
                    if len(mini_sentence[i][0].encode()) == 1 and len(mini_sentence[i - 1][0].encode()) == 1:
                        mini_sentence[i] = " " + mini_sentence[i]
                words_with_punc.append(mini_sentence[i])
                if self.punc_list[punctuations[i]] != "_":
                    words_with_punc.append(self.punc_list[punctuations[i]])
            new_mini_sentence += "".join(words_with_punc)
            # Add Period for the end of the sentence
            new_mini_sentence_out = new_mini_sentence
            new_mini_sentence_punc_out = new_mini_sentence_punc
            if mini_sentence_i == len(mini_sentences) - 1:
                if new_mini_sentence[-1] == "，" or new_mini_sentence[-1] == "、":
                    new_mini_sentence_out = new_mini_sentence[:-1] + "。"
                    new_mini_sentence_punc_out = new_mini_sentence_punc[:-1] + [self.period]
                elif new_mini_sentence[-1] != "。" and new_mini_sentence[-1] != "？":
                    new_mini_sentence_out = new_mini_sentence + "。"
                    new_mini_sentence_punc_out = new_mini_sentence_punc[:-1] + [self.period]
        return new_mini_sentence_out, new_mini_sentence_punc_out

    def infer(self, feats: np.ndarray,
              feats_len: np.ndarray) -> Tuple[np.ndarray, np.ndarray]:
        outputs = self.ort_infer([feats, feats_len])
        return outputs