import json
import re

def process_json_files(start, end):
    base_path = "texts"
    results = []

    for i in range(start, end + 1):
        file_name = f"{base_path}/{i:02}.json"
        try:
            with open(file_name, 'r', encoding='utf-8') as file:
                data = json.load(file)
                if data:
                    # Return a tuple of book_id and text data
                    results.append((i, {"title": data.get("title", "No title"), "text": data.get("text", [])}))

        except FileNotFoundError:
            results.append((i, {"error": f"File {file_name} not found."}))  # Use a tuple here
        except json.JSONDecodeError as e:
            results.append((i, {"error": f"File {file_name} could not be read as JSON: {e}"}))  # Use a tuple here
        except KeyError as e:
            results.append((i, {"error": f"Expected key 'text' is missing in {file_name}: {e}"}))  # Use a tuple here

    return results