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from langchain_openai import ChatOpenAI
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
from langchain_core.output_parsers import StrOutputParser
from langchain_core.runnables import RunnablePassthrough, RunnableLambda
from langchain_core.messages import HumanMessage, AIMessage
from langsmith import traceable
import time
from typing import List, Dict

from src.utils.config import RAGConfig
from src.retriever.retriever import RAGRetriever
from src.router.query_router import QueryRouter


class RAGPipeline:
    """๋Œ€ํ™”ํ˜• RAG ํŒŒ์ดํ”„๋ผ์ธ - LangChain Chain ๊ธฐ๋ฐ˜"""

    def __init__(self, config: RAGConfig = None, model: str = None, top_k: int = None):
        """์ดˆ๊ธฐํ™”"""
        self.config = config or RAGConfig()
        self.model = model or self.config.LLM_MODEL_NAME
        self.top_k = top_k or self.config.DEFAULT_TOP_K
        
        # ๊ฒ€์ƒ‰ ์„ค์ •
        self.search_mode = self.config.DEFAULT_SEARCH_MODE
        self.alpha = self.config.DEFAULT_ALPHA

        # LLM ์ดˆ๊ธฐํ™” (LangChain ChatOpenAI)
        self.llm = ChatOpenAI(
            model=self.model,
            openai_api_key=self.config.OPENAI_API_KEY,
            timeout=60.0,
            max_retries=3
        )

        # Retriever ๋ฐ ๋ผ์šฐํ„ฐ ์ดˆ๊ธฐํ™”
        self.retriever = RAGRetriever(config=self.config)
        self.router = QueryRouter()
        self._direct_responses = {
            'greeting': "์•ˆ๋…•ํ•˜์„ธ์š”! ๊ณต๊ณต์ž…์ฐฐ RFP ๊ด€๋ จ ๊ถ๊ธˆํ•œ ์‚ฌํ•ญ์„ ์•Œ๋ ค์ฃผ์‹œ๋ฉด ์ž๋ฃŒ๋ฅผ ์ฐพ์•„ ๋“œ๋ฆด๊ฒŒ์š”.",
            'thanks': "๋„์›€์ด ๋˜์—ˆ๋‹ค๋‹ˆ ๋‹คํ–‰์ž…๋‹ˆ๋‹ค. ์ถ”๊ฐ€๋กœ ๊ถ๊ธˆํ•œ ์ ์ด ์žˆ์œผ๋ฉด ์–ธ์ œ๋“ ์ง€ ๋ง์”€ํ•ด ์ฃผ์„ธ์š”!",
            'out_of_scope': "ํ•ด๋‹น ์งˆ๋ฌธ์€ ํ˜„์žฌ ๋ณด์œ ํ•œ ์ž…์ฐฐยท์‚ฌ์—… ๋ฌธ์„œ์—์„œ ๋‹ค๋ฃจ์ง€ ์•Š์Šต๋‹ˆ๋‹ค. ๋‹ค๋ฅธ ์งˆ๋ฌธ์„ ์‹œ๋„ํ•ด ์ฃผ์„ธ์š”."
        }
        
        # ๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ
        self.chat_history: List[Dict] = []
        
        # ๋งˆ์ง€๋ง‰ ๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ ์ €์žฅ (sources ๋ฐ˜ํ™˜์šฉ)
        self._last_retrieved_docs = []

        # ํ”„๋กฌํ”„ํŠธ ํ…œํ”Œ๋ฆฟ (๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ ํฌํ•จ)
        self.prompt = ChatPromptTemplate.from_messages([
            ("system", """๋‹น์‹ ์€ ๊ณต๊ณต์ž…์ฐฐ RFP๋ฅผ ๋ถ„์„ํ•˜๋Š” ์ž…์ฐฐ๋ฉ”์ดํŠธ ์‚ฌ๋‚ด ๋ถ„์„๊ฐ€์ž…๋‹ˆ๋‹ค. ์ œ๊ณต๋œ ์ปจํ…์ŠคํŠธ๋งŒ์œผ๋กœ ์š”๊ตฌ์‚ฌํ•ญยท์˜ˆ์‚ฐยท๋Œ€์ƒ ๊ธฐ๊ด€ยท์ œ์ถœ ๋ฐฉ์‹ ๋“ฑ์„ ๊ตฌ์กฐํ™”ํ•ด ์˜์‚ฌ๊ฒฐ์ •์„ ์ง€์›ํ•˜์„ธ์š”.

            # ๊ทœ์น™
            - ๋‹ต๋ณ€์€ ํ•œ๊ตญ์–ด๋กœ ์ž‘์„ฑํ•ฉ๋‹ˆ๋‹ค.
            - ์ปจํ…์ŠคํŠธ ๋ฐ– ๋‚ด์šฉ์„ ์ถ”์ธกํ•˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
            - ์ปจํ…์ŠคํŠธ๊ฐ€ ๋น„์–ด์žˆ๊ฑฐ๋‚˜ ์งˆ๋ฌธ๊ณผ ์ง์ ‘ ๊ด€๋ จ๋œ ์‚ฌ์‹ค์ด ์—†์œผ๋ฉด "๋ฌธ์„œ์—์„œ ํ•ด๋‹น ์ •๋ณด๋ฅผ ์ฐพ์„ ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค." ํ•œ ๋ฌธ์žฅ์œผ๋กœ๋งŒ ๋‹ตํ•ฉ๋‹ˆ๋‹ค.
            - ์—ฌ๋Ÿฌ ๋ฌธ์„œ๋ฅผ ๋น„๊ตํ•  ๋•Œ๋Š” ๋ฌธ์„œ๋ณ„ ์ฐจ์ด๋ฅผ ํ‘œ ๋˜๋Š” ๋ชฉ๋ก์œผ๋กœ ์ •๋ฆฌํ•ฉ๋‹ˆ๋‹ค.
            - ์ˆซ์ž์—๋Š” ๊ฐ€๋Šฅํ•œ ๋‹จ์œ„๋ฅผ ํฌํ•จํ•ฉ๋‹ˆ๋‹ค.
            - ์ง์ „ ๋Œ€ํ™” ๋งฅ๋ฝ์„ ๋ฐ˜์˜ํ•˜๋˜, ํ™•์ธ๋˜์ง€ ์•Š์€ ๋‚ด์šฉ์„ ์ถ”๋ก ํ•ด ์ถ”๊ฐ€ํ•˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค.

            # ๋‹ต๋ณ€ ํ˜•์‹
            1. ํ•œ ์ค„ ์š”์•ฝ: ์งˆ๋ฌธ ํ•ต์‹ฌ์„ ํ•œ๋‘ ๋ฌธ์žฅ์œผ๋กœ ์ž‘์„ฑํ•ฉ๋‹ˆ๋‹ค.
            2. ์ƒ์„ธ ๋‹ต๋ณ€: [์š”๊ตฌ์‚ฌํ•ญ], [๋Œ€์ƒ ๊ธฐ๊ด€], [์˜ˆ์‚ฐ], [์ œ์ถœ ํ˜•์‹/๋ฐฉ๋ฒ•], [ํ‰๊ฐ€ ๊ธฐ์ค€] ๋“ฑ ๋ฌธ์„œ์—์„œ ํ™•์ธ๋œ ํ•ญ๋ชฉ๋งŒ ์ •๋ฆฌํ•ฉ๋‹ˆ๋‹ค.
            3. ๊ทผ๊ฑฐ ์ •๋ณด: ์œ„ ๋‹ต๋ณ€์˜ ๊ทผ๊ฑฐ๊ฐ€ ๋œ ๋ฌธ์žฅ์ด๋‚˜ ๋ฌธ๋‹จ์„ ์š”์•ฝํ•ฉ๋‹ˆ๋‹ค.
            4. ๋ถ€์กฑํ•œ ์ •๋ณด: ๋ฌธ์„œ์—์„œ ์ฐพ์„ ์ˆ˜ ์—†๋Š” ํ•ญ๋ชฉ์€ "๋ฌธ์„œ์—์„œ ํ™•์ธ ๋ถˆ๊ฐ€"๋กœ ํ‘œ๊ธฐํ•ฉ๋‹ˆ๋‹ค."""),
                        
                        # ๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ
                        MessagesPlaceholder(variable_name="chat_history"),
                        
                        # ํ˜„์žฌ ์งˆ๋ฌธ๊ณผ ์ปจํ…์ŠคํŠธ
                        ("user", """# ์ปจํ…์ŠคํŠธ
            {context}

            # ์งˆ๋ฌธ
            {question}

            ์œ„ ๊ทœ์น™์— ๋”ฐ๋ผ ๋‹ต๋ณ€ํ•˜์„ธ์š”.""")
        ])

        # Chain ๊ตฌ์„ฑ
        self.chain = (
            {
                "context": RunnableLambda(self._retrieve_and_format),
                "question": RunnablePassthrough(),
                "chat_history": RunnableLambda(lambda x: self._get_chat_history())
            }
            | self.prompt
            | self.llm
            | StrOutputParser()
        )

        print(f"โœ… RAG ํŒŒ์ดํ”„๋ผ์ธ ์ดˆ๊ธฐํ™” ์™„๋ฃŒ")
        print(f"   - ๋ชจ๋ธ: {self.model}")
        print(f"   - ๊ธฐ๋ณธ top_k: {self.top_k}")
        print(f"   - ๊ฒ€์ƒ‰ ๋ชจ๋“œ: {self.search_mode}")

    def _get_chat_history(self) -> List:
        """๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ๋ฅผ LangChain ๋ฉ”์‹œ์ง€ ํ˜•์‹์œผ๋กœ ๋ณ€ํ™˜"""
        messages = []
        for msg in self.chat_history:
            if msg["role"] == "user":
                messages.append(HumanMessage(content=msg["content"]))
            else:
                messages.append(AIMessage(content=msg["content"]))
        return messages

    def _retrieve_and_format(self, query: str) -> str:
        """๊ฒ€์ƒ‰ ์ˆ˜ํ–‰ ๋ฐ ์ปจํ…์ŠคํŠธ ํฌ๋งทํŒ…"""
        # ๊ฒ€์ƒ‰ ๋ชจ๋“œ์— ๋”ฐ๋ผ ๋ฌธ์„œ ๊ฒ€์ƒ‰
        if self.search_mode == "embedding":
            docs = self.retriever.search(query, top_k=self.top_k)
        elif self.search_mode == "hybrid":
            docs = self.retriever.hybrid_search(query, top_k=self.top_k, alpha=self.alpha)
        elif self.search_mode == "hybrid_rerank":
            docs = self.retriever.hybrid_search_with_rerank(
                query, top_k=self.top_k, alpha=self.alpha
            )
        else:
            docs = self.retriever.search(query, top_k=self.top_k)
        
        # ๋งˆ์ง€๋ง‰ ๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ ์ €์žฅ
        self._last_retrieved_docs = docs
        
        # ์ปจํ…์ŠคํŠธ ํฌ๋งทํŒ…
        return self._format_context(docs)

    def _format_context(self, retrieved_docs: list) -> str:
        """๊ฒ€์ƒ‰๋œ ๋ฌธ์„œ๋ฅผ ์ปจํ…์ŠคํŠธ๋กœ ๋ณ€ํ™˜"""
        if not retrieved_docs:
            return "๊ด€๋ จ ๋ฌธ์„œ๋ฅผ ์ฐพ์„ ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค."
        
        context_parts = []
        for i, doc in enumerate(retrieved_docs, 1):
            context_parts.append(f"[๋ฌธ์„œ {i}]\n{doc['content']}\n")
        return "\n".join(context_parts)

    def _format_sources(self, retrieved_docs: list) -> list:
        """๊ฒ€์ƒ‰๋œ ๋ฌธ์„œ๋ฅผ sources ํ˜•์‹์œผ๋กœ ๋ณ€ํ™˜"""
        sources = []
        for doc in retrieved_docs:
            source_info = {
                'content': doc['content'],
                'metadata': doc['metadata'],
                'filename': doc.get('filename', 'N/A'),
                'organization': doc.get('organization', 'N/A')
            }
            
            # ๊ฒ€์ƒ‰ ๋ชจ๋“œ์— ๋”ฐ๋ผ ์ ์ˆ˜ ํ•„๋“œ๊ฐ€ ๋‹ค๋ฆ„
            if 'rerank_score' in doc:
                source_info['score'] = doc['rerank_score']
                source_info['score_type'] = 'rerank'
            elif 'hybrid_score' in doc:
                source_info['score'] = doc['hybrid_score']
                source_info['score_type'] = 'hybrid'
            elif 'relevance_score' in doc:
                source_info['score'] = doc['relevance_score']
                source_info['score_type'] = 'embedding'
            else:
                source_info['score'] = 0
                source_info['score_type'] = 'unknown'
            
            sources.append(source_info)
        return sources

    @traceable(
        name="RAG_Generate_Answer",
        metadata={"component": "generator", "version": "2.0"}
    )
    def generate_answer(
        self, 
        query: str, 
        top_k: int = None,
        search_mode: str = None,
        alpha: float = None
    ) -> dict:
        """
        ๋‹ต๋ณ€ ์ƒ์„ฑ (Chain ๊ธฐ๋ฐ˜)
        
        Args:
            query: ์งˆ๋ฌธ
            top_k: ๊ฒ€์ƒ‰ํ•  ๋ฌธ์„œ ์ˆ˜
            search_mode: ๊ฒ€์ƒ‰ ๋ชจ๋“œ ("embedding", "hybrid", "hybrid_rerank")
            alpha: ์ž„๋ฒ ๋”ฉ ๊ฐ€์ค‘์น˜ (0~1)
        
        Returns:
            dict: answer, sources, search_mode, usage
        """
        try:
            start_time = time.time()

            classification = self.router.classify(query)
            query_type = classification.get('type', 'document')

            # ๋น„๋ฌธ์„œ ์งˆ์˜๋Š” ์ฆ‰์‹œ ์‘๋‹ต
            if query_type != 'document':
                print(f"โญ๏ธ  ๋ผ์šฐํ„ฐ: ๊ฒ€์ƒ‰ ์ƒ๋žต ({query_type})")
                answer = self._direct_responses.get(
                    query_type,
                    self._direct_responses['out_of_scope']
                )
                elapsed_time = time.time() - start_time
                self._last_retrieved_docs = []

                self.chat_history.append({"role": "user", "content": query})
                self.chat_history.append({"role": "assistant", "content": answer})

                return {
                    'answer': answer,
                    'sources': [],
                    'search_mode': 'none',
                    'elapsed_time': elapsed_time,
                    'usage': {
                        'total_tokens': 0,
                        'prompt_tokens': 0,
                        'completion_tokens': 0
                    },
                    'routing': classification
                }

            # ํŒŒ๋ผ๋ฏธํ„ฐ ์„ค์ •
            if top_k is not None:
                self.top_k = top_k
            if search_mode is not None:
                self.search_mode = search_mode
            if alpha is not None:
                self.alpha = alpha
            
            # Chain ์‹คํ–‰
            answer = self.chain.invoke(query)
            
            # ๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ๊ฐ€ ์—†์œผ๋ฉด ์•ˆ์ „ ์‘๋‹ต์œผ๋กœ ๋Œ€์ฒด
            if not self._last_retrieved_docs:
                answer = "๋ฌธ์„œ์—์„œ ๊ด€๋ จ ์ •๋ณด๋ฅผ ์ฐพ์„ ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค. ๋‹ค๋ฅธ ์งˆ๋ฌธ์„ ์ž…๋ ฅํ•ด ์ฃผ์„ธ์š”."
                print("โš ๏ธ  ๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ ์—†์Œ - ์•ˆ์ „ ์‘๋‹ต ๋ฐ˜ํ™˜")
            
            elapsed_time = time.time() - start_time
            
            # ๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ์— ์ถ”๊ฐ€
            self.chat_history.append({"role": "user", "content": query})
            self.chat_history.append({"role": "assistant", "content": answer})
            
            # ํ† ํฐ ์‚ฌ์šฉ๋Ÿ‰ ์ถ”์ • (LangChain์—์„œ๋Š” ์ง์ ‘ ์ ‘๊ทผ ์–ด๋ ค์›€)
            estimated_tokens = len(query.split()) + len(answer.split()) * 2
            
            return {
                'answer': answer,
                'sources': self._format_sources(self._last_retrieved_docs),
                'search_mode': self.search_mode,
                'elapsed_time': elapsed_time,
                'usage': {
                    'total_tokens': estimated_tokens,
                    'prompt_tokens': 0,
                    'completion_tokens': 0
                },
                'routing': classification
            }
        
        except Exception as e:
            print(f"โŒ ๋‹ต๋ณ€ ์ƒ์„ฑ ์‹คํŒจ: {e}")
            import traceback
            traceback.print_exc()
            raise RuntimeError(f"๋‹ต๋ณ€ ์ƒ์„ฑ ์‹คํŒจ: {str(e)}") from e

    def chat(self, query: str) -> str:
        """
        ๊ฐ„๋‹จํ•œ ๋Œ€ํ™” ์ธํ„ฐํŽ˜์ด์Šค
        
        Args:
            query: ์งˆ๋ฌธ
        
        Returns:
            str: ๋‹ต๋ณ€ ํ…์ŠคํŠธ๋งŒ ๋ฐ˜ํ™˜
        """
        result = self.generate_answer(query)
        return result['answer']

    def clear_history(self):
        """๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ ์ดˆ๊ธฐํ™”"""
        self.chat_history = []
        print("๐Ÿ—‘๏ธ ๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ๊ฐ€ ์ดˆ๊ธฐํ™”๋˜์—ˆ์Šต๋‹ˆ๋‹ค.")

    def get_history(self) -> List[Dict]:
        """๋Œ€ํ™” ํžˆ์Šคํ† ๋ฆฌ ๋ฐ˜ํ™˜"""
        return self.chat_history.copy()

    def set_search_config(self, search_mode: str = None, top_k: int = None, alpha: float = None):
        """๊ฒ€์ƒ‰ ์„ค์ • ๋ณ€๊ฒฝ"""
        if search_mode is not None:
            self.search_mode = search_mode
        if top_k is not None:
            self.top_k = top_k
        if alpha is not None:
            self.alpha = alpha
        
        print(f"๐Ÿ”ง ๊ฒ€์ƒ‰ ์„ค์ • ๋ณ€๊ฒฝ: mode={self.search_mode}, top_k={self.top_k}, alpha={self.alpha}")

    def print_result(self, result: dict, query: str = None):
        """๊ฒฐ๊ณผ ์ถœ๋ ฅ"""
        print("\n" + "="*60)
        if query:
            print(f"์งˆ๋ฌธ: {query}")
        print(f"๊ฒ€์ƒ‰ ๋ชจ๋“œ: {result.get('search_mode', 'N/A')}")
        if 'elapsed_time' in result:
            print(f"์†Œ์š” ์‹œ๊ฐ„: {result['elapsed_time']:.2f}์ดˆ")
        print("="*60)
        print(f"\n๐Ÿ’ฌ ๋‹ต๋ณ€:\n{result['answer']}")
        print(f"\n๐Ÿ“š ์ฐธ๊ณ  ๋ฌธ์„œ ({len(result['sources'])}๊ฐœ):")
        for i, source in enumerate(result['sources'], 1):
            score = source.get('score', 0)
            score_type = source.get('score_type', '')
            print(f"  [{i}] {source['filename']}")
            print(f"      ์ ์ˆ˜: {score:.3f} ({score_type})")
        print("="*60)


# ๋Œ€ํ™”ํ˜• ์‹คํ–‰
def interactive_mode():
    """๋Œ€ํ™”ํ˜• ๋ชจ๋“œ ์‹คํ–‰"""
    print("=" * 60)
    print("๋Œ€ํ™”ํ˜• RAG ์‹œ์Šคํ…œ ์ดˆ๊ธฐํ™” ์ค‘...")
    print("=" * 60)
    
    config = RAGConfig()
    pipeline = RAGPipeline(config=config)
    
    print("\n" + "=" * 60)
    print("๋Œ€ํ™”ํ˜• ๋ชจ๋“œ ์‹œ์ž‘")
    print("๋ช…๋ น์–ด: 'quit' (์ข…๋ฃŒ), 'clear' (ํžˆ์Šคํ† ๋ฆฌ ์ดˆ๊ธฐํ™”), 'mode' (๊ฒ€์ƒ‰๋ชจ๋“œ ๋ณ€๊ฒฝ)")
    print("=" * 60)
    
    while True:
        user_query = input("\n์งˆ๋ฌธ: ").strip()
        
        if not user_query:
            continue
        
        if user_query.lower() in ['quit', 'exit', '์ข…๋ฃŒ', 'q']:
            print("์‹œ์Šคํ…œ์„ ์ข…๋ฃŒํ•ฉ๋‹ˆ๋‹ค.")
            break
        
        if user_query.lower() == 'clear':
            pipeline.clear_history()
            continue
        
        if user_query.lower() == 'mode':
            print("\n๊ฒ€์ƒ‰ ๋ชจ๋“œ ์„ ํƒ:")
            print("1. embedding - ์ž„๋ฒ ๋”ฉ ๊ฒ€์ƒ‰")
            print("2. hybrid - BM25 + ์ž„๋ฒ ๋”ฉ")
            print("3. hybrid_rerank - Hybrid + Re-ranker (๊ถŒ์žฅ)")
            choice = input("์„ ํƒ (1/2/3): ").strip()
            modes = {'1': 'embedding', '2': 'hybrid', '3': 'hybrid_rerank'}
            if choice in modes:
                pipeline.set_search_config(search_mode=modes[choice])
            continue
        
        try:
            result = pipeline.generate_answer(query=user_query)
            pipeline.print_result(result, user_query)
            
            # ์†Œ์Šค ์ถœ๋ ฅ ์—ฌ๋ถ€
            show_source = input("\n์ฐธ์กฐ ๋ฌธ์„œ ์ƒ์„ธ ๋ณด๊ธฐ? (y/n): ").strip().lower()
            if show_source == 'y':
                for i, source in enumerate(result['sources'], 1):
                    print(f"\n{'='*40}")
                    print(f"[๋ฌธ์„œ {i}] {source['filename']}")
                    print(f"๋ฐœ์ฃผ๊ธฐ๊ด€: {source['organization']}")
                    print(f"๋‚ด์šฉ:\n{source['content'][:500]}...")
        
        except Exception as e:
            print(f"โŒ ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {e}")


# ์‚ฌ์šฉ ์˜ˆ์‹œ
if __name__ == "__main__":
    interactive_mode()