import h5py
import re
class DataLoader:
    def __init__(self,file_name, chunk_size=10):
        self.file_name=file_name
        self.chunk_size=chunk_size
    def load_txt(self):
        with open(self.file_name+".txt", 'r', encoding='utf-8') as file:
            text_data = file.read()
        delimiters = r'፡፡|::|:|\.|\?|!'
        # Split into sentences
        sentences = re.split(delimiters,text_data)
        sentences = [sentence.strip() for sentence in sentences if sentence.strip()]
        return sentences
    def load_hdf5(self,start_index=0):
        dataset_name = 'text_data'  
        with h5py.File(self.file_name+'.h5', 'r') as hdf:
            dataset = hdf[dataset_name]  
            if isinstance(dataset, h5py.Dataset):
                if hasattr(dataset, 'shape'):
                    total_chunks = dataset.shape[0]  # Number of chunks in the dataset
                    sentences_per_chunk = dataset.shape[1]  # Sentences per chunk (e.g., 10 sentences)
                else:
                    raise ValueError(f"Dataset '{dataset_name}' does not have a shape attribute.")
            else:
                raise TypeError(f"Dataset '{dataset_name}' is not a valid h5py.Dataset.")
            end_index = min(start_index + self.chunk_size, total_chunks)
            chunk_data = dataset[start_index:end_index]  # This retrieves a chunk of sentences
            chunk_data_decoded = []
            for chunk in chunk_data:
                chunk_data_decoded.extend([sentence.decode('utf-8') for sentence in chunk[:self.chunk_size]])
            return total_chunks,chunk_data_decoded, end_index
    def save_fast_text_file(self,file_name,sentences):
        print("i am here")
        with open(file_name, "w", encoding="utf-8") as f:
            for sentence in sentences:
                sentence = sentence.strip()
                if not sentence.endswith("።"):
                    sentence += "።"
                f.write(sentence + "\n")