import PyPDF2
from typing import List

class PDFLoader:
    def __init__(self, path: str):
        self.path = path

    def load_documents(self) -> List[str]:
        documents = []
        with open(self.path, 'rb') as file:
            pdf_reader = PyPDF2.PdfReader(file)
            for page in pdf_reader.pages:
                documents.append(page.extract_text())
        return documents

class CharacterTextSplitter:
    def __init__(self, chunk_size: int = 1500, chunk_overlap: int = 300):
        self.chunk_size = chunk_size
        self.chunk_overlap = chunk_overlap

    def split_texts(self, texts: List[str]) -> List[str]:
        split_texts = []
        for text in texts:
            split_texts.extend(self._split_text(text))
        return split_texts

    def _split_text(self, text: str) -> List[str]:
        chunks = []
        start = 0
        while start < len(text):
            end = min(start + self.chunk_size, len(text))
            chunks.append(text[start:end])
            start = end - self.chunk_overlap
        return chunks