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import os
import re
import logging
from typing import List, Dict, Tuple
import chromadb
from chromadb.utils import embedding_functions
from config import EMBEDDING_MODEL, DATABASE_DIR

logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

class KodeksProcessor:
    def __init__(self):
        logger.info(f"Inicjalizacja klienta bazy danych w katalogu: {DATABASE_DIR}")
        if not os.path.exists(DATABASE_DIR):
            os.makedirs(DATABASE_DIR)
            logger.info(f"Utworzono katalog {DATABASE_DIR}")
        
        self.client = chromadb.PersistentClient(path=DATABASE_DIR)
        logger.info("Klient bazy danych zainicjalizowany")
        
        try:
            self.collection = self.client.get_or_create_collection(
                name="kodeksy",
                embedding_function=embedding_functions.SentenceTransformerEmbeddingFunction(
                    model_name=EMBEDDING_MODEL
                )
            )
            logger.info("Kolekcja 'kodeksy' pobrana lub utworzona")
        except Exception as e:
            logger.error(f"Błąd podczas pobierania lub tworzenia kolekcji: {e}")
            raise

    def extract_metadata(self, text: str) -> Dict:
        metadata = {}
        dz_u_match = re.search(r'Dz\.U\.(\d{4})\.(\d+)\.(\d+)', text)
        if dz_u_match:
            metadata['dz_u'] = f"Dz.U.{dz_u_match.group(1)}.{dz_u_match.group(2)}.{dz_u_match.group(3)}"
            metadata['rok'] = dz_u_match.group(1)

        nazwa_match = re.search(r'USTAWA\s+z dnia(.*?)\n(.*?)\n', text)
        if nazwa_match:
            metadata['data_ustawy'] = nazwa_match.group(1).strip()
            metadata['nazwa'] = nazwa_match.group(2).strip()

        zmiany = re.findall(r'(\d{4}-\d{2}-\d{2})\s+(zm\.\s+DZ\.U\.(\d{4})\.(\d+)\.(\d+)\s+art\.\s+(\d+)(?:\s+§\s+(\d+))?)', text)
        if zmiany:
            metadata['historia_zmian'] = [
                {
                    'data': data,
                    'dz_u': f"Dz.U.{rok}.{numer}.{pozycja}",
                    'artykul': artykul,
                    'paragraf': paragraf if paragraf else None
                }
                for data, _, rok, numer, pozycja, artykul, paragraf in zmiany
            ]

        logger.debug(f"Wyodrębnione metadane: {metadata}")
        return metadata

    def split_header_and_content(self, text: str) -> Tuple[str, str]:
        parts = text.split("USTAWA", 1)
        if len(parts) > 1:
            return parts[0], "USTAWA" + parts[1]
        return "", text

    def process_article(self, article_text: str) -> Dict:
        art_num_match = re.match(r'Art\.\s*(\d+[a-z]?)', article_text)
        article_num = art_num_match.group(1) if art_num_match else ""

        paragraphs = re.findall(r'§\s*(\d+)\.\s*(.*?)(?=§\s*\d+|Art\.\s*\d+|$)', article_text, re.DOTALL)

        if not paragraphs:
            return {
                "article_num": article_num,
                "content": article_text.strip(),
                "has_paragraphs": False
            }

        return {
            "article_num": article_num,
            "paragraphs": paragraphs,
            "has_paragraphs": True
        }

    def split_into_chunks(self, text: str, metadata: Dict) -> List[Dict]:
        chunks = []
        articles = re.split(r'(Art\.\s*\d+[a-z]?)', text)

        for i in range(1, len(articles), 2):
            article_title = articles[i].strip()
            article_content = articles[i + 1].strip() if i + 1 < len(articles) else ""

            processed_article = self.process_article(article_title + " " + article_content)

            chunk_metadata = {
                **metadata,
                "article": processed_article["article_num"]
            }

            if processed_article["has_paragraphs"]:
                for par_num, par_content in processed_article["paragraphs"]:
                    chunk = {
                        "text": f"{article_title} §{par_num}. {par_content.strip()}",
                        "metadata": {**chunk_metadata, "paragraph": par_num}
                    }
                    chunks.append(chunk)
                    logger.debug(f"Utworzono chunk: {chunk['text'][:100]}...")
            else:
                chunk = {
                    "text": processed_article["content"],
                    "metadata": chunk_metadata
                }
                chunks.append(chunk)
                logger.debug(f"Utworzono chunk: {chunk['text'][:100]}...")

        logger.debug(f"Podzielono tekst na {len(chunks)} chunków.")
        return chunks

    def process_file(self, filepath: str) -> None:
        logger.info(f"Rozpoczęcie przetwarzania pliku: {filepath}")
        try:
            with open(filepath, 'r', encoding='utf-8') as file:
                content = file.read()
            logger.info(f"Odczytano zawartość pliku: {filepath}")

            header, main_content = self.split_header_and_content(content)
            metadata = self.extract_metadata(main_content)
            metadata['filename'] = os.path.basename(filepath)

            chunks = self.split_into_chunks(main_content, metadata)
            logger.info(f"Podzielono plik na {len(chunks)} chunków")

            if chunks:
                self.collection.add(
                    documents=[chunk["text"] for chunk in chunks],
                    metadatas=[chunk["metadata"] for chunk in chunks],
                    ids=[f"{metadata['filename']}_{chunk['metadata']['article']}_{i}" for i, chunk in enumerate(chunks)]
                )
                logger.info(f"Dodano {len(chunks)} chunków do kolekcji z pliku {metadata['filename']}")
            else:
                logger.warning(f"Brak chunków do dodania z pliku: {filepath}")
        except Exception as e:
            logger.error(f"Błąd podczas przetwarzania pliku {filepath}: {e}")

    def process_all_files(self, directory: str) -> None:
        logger.info(f"Rozpoczęcie przetwarzania wszystkich plików w katalogu: {directory}")
        if not os.path.exists(directory):
            logger.error(f"Katalog {directory} nie istnieje!")
            return
        try:
            files = [f for f in os.listdir(directory) if f.endswith('.txt')]
            logger.info(f"Znaleziono {len(files)} plików .txt")
            for filename in files:
                filepath = os.path.join(directory, filename)
                logger.info(f"Przetwarzanie pliku: {filepath}")
                self.process_file(filepath)
            logger.info("Zakończono przetwarzanie plików.")
        except Exception as e:
            logger.error(f"Błąd podczas przetwarzania plików: {e}")

    def verify_data_loading(self):
        count = self.collection.count()
        logger.info(f"Całkowita liczba dokumentów w kolekcji: {count}")
        if count == 0:
            logger.warning("Nie załadowano żadnych dokumentów do bazy danych.")

    def test_search(self):
        test_queries = ["kodeks karny", "art. 1", "przestępstwo"]
        for query in test_queries:
            results = self.search(query)
            logger.info(f"Zapytanie testowe '{query}' zwróciło {len(results['documents'][0])} wyników")

    def search(self, query: str, n_results: int = 3) -> Dict:
        logger.info(f"Wyszukiwanie w bazie danych dla zapytania: {query}")
        try:
            results = self.collection.query(
                query_texts=[query],
                n_results=n_results
            )
            logger.info(f"Znaleziono {len(results['documents'][0])} wyników dla zapytania: {query}")
            return results
        except Exception as e:
            logger.error(f"Błąd podczas wyszukiwania: {e}")
            return {"documents": [[]], "metadatas": [[]], "distances": [[]]}

    def list_all_documents(self) -> None:
        try:
            all_docs = self.collection.get(include=['metadatas'])
            if all_docs['metadatas']:
                for metadata in all_docs['metadatas']:
                    logger.info(f"Dokument: {metadata}")
            else:
                logger.info("Brak dokumentów w bazie.")
        except Exception as e:
            logger.error(f"Błąd podczas listowania dokumentów: {e}")

if __name__ == "__main__":
    processor = KodeksProcessor()
    processor.process_all_files("data/kodeksy")
    processor.verify_data_loading()
    processor.test_search()
    processor.list_all_documents()