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"""
Generation router for Lily LLM API
"""
from fastapi import APIRouter, HTTPException, Request, UploadFile, File, Form, Depends
import os
from typing import Optional, List
import logging
import time

from ...models.schemas import GenerateResponse, MultimodalGenerateResponse
from ...services.generation_service import generate_sync
from ...services.model_service import is_model_loaded
from ...utils.system_utils import select_model_interactive
from ...services.session_registry import get_user_for_room, set_user_for_room, set_user_for_session, pop_flag_for_room

logger = logging.getLogger(__name__)
router = APIRouter()

@router.post("/generate", response_model=GenerateResponse)
async def generate(request: Request,
                  prompt: str = Form(...), 
                  image1: UploadFile = File(None),
                  image2: UploadFile = File(None),
                  image3: UploadFile = File(None),
                  image4: UploadFile = File(None),
                  user_id: str = Form("anonymous"),
                  room_id: str = Form("default"),
                  use_context: bool = Form(True),
                  session_id: str = Form(None),
                  use_rag_images: bool = Form(False),
                  use_rag_text: bool = Form(False),
                  document_id: str = Form(None),
                  image_short_side: int = Form(None),
                  # ์ƒˆ ์˜ต์…˜: ์ƒ์„ฑ ํ† ํฐ ์ˆ˜/์ž…๋ ฅ ๊ธธ์ด ์ œ์–ด
                  max_new_tokens: int = Form(None),
                  input_max_length: int = Form(None)):
    
    if not is_model_loaded():
        raise HTTPException(status_code=503, detail="๋ชจ๋ธ์ด ๋กœ๋“œ๋˜์ง€ ์•Š์•˜์Šต๋‹ˆ๋‹ค.")

    start_time = time.time()

    # ์‚ฌ์šฉ์ž๊ฐ€ ๋น„์–ด์žˆ๊ฑฐ๋‚˜ anonymous๋ฉด ๋ฃธ ๊ธฐ๋ฐ˜ ์ตœ๊ทผ ์‚ฌ์šฉ์ž ๋ณด์ •
    if not user_id or user_id == "anonymous":
        try:
            recovered_user = get_user_for_room(room_id)
            if recovered_user:
                print(f"๐Ÿ” [DEBUG] ๋ฃธ ๊ธฐ๋ฐ˜ ์‚ฌ์šฉ์ž ๋ณด์ •: {user_id} -> {recovered_user} (room={room_id})")
                user_id = recovered_user
        except Exception:
            pass

    # ๋ฐฉ/์‚ฌ์šฉ์ž ๊ธฐ๋ฐ˜ ๊ณ ์ • ์„ธ์…˜ ID๋กœ ์ •๊ทœํ™”
    stable_session_id = f"room_{room_id}_{user_id}"
    if not session_id or session_id != stable_session_id:
        original = session_id
        session_id = stable_session_id
        print(f"๐Ÿ” [DEBUG] ์„ธ์…˜ ID ์ •๊ทœํ™”: {original} -> {session_id}")
    else:
        # ์ œ๊ณต๋œ ์„ธ์…˜์—๋„ ์‚ฌ์šฉ์ž ๋งคํ•‘ ์ €์žฅ
        try:
            set_user_for_session(session_id, user_id)
        except Exception:
            pass
    
    if use_context:
        try:
            from lily_llm_core.context_manager import context_manager
            # ์ค‘๊ธฐ/์žฅ๊ธฐ ๋ฉ”๋ชจ๋ฆฌ ์ฃผ์ž…: room/user ๊ธฐ๋ฐ˜
            try:
                from lily_llm_core.memory_store import memory_store
                rm = memory_store.get_room_memory(room_id)
                um = memory_store.get_user_memory(user_id)
                note_parts = []
                if rm and (rm.get("summary") or rm.get("key_topics")):
                    note_parts.append(f"[Room Memory]\n{rm.get('summary','')}\nTopics: {rm.get('key_topics','')}")
                if um and um.get("notes"):
                    note_parts.append(f"[User Memory]\n{um.get('notes','')}")
                if note_parts:
                    context_manager.set_system_note(session_id, "hier_mem", "\n\n".join(note_parts))
            except Exception as _me:
                print(f"โš ๏ธ [DEBUG] ๋ฉ”๋ชจ๋ฆฌ ์ฃผ์ž… ์‹คํŒจ: {_me}")
            # ์ปจํ…์ŠคํŠธ ์˜์†ํ™” ์„ค์ •: ํ•„์š” ์‹œ ์„ธ์…˜ ํŒŒ์ผ์—์„œ ๋กœ๋“œ
            try:
                persist = os.getenv('LILY_CONTEXT_PERSIST', '0') in ['1', 'true', 'True']
                if persist:
                    base_dir = os.getenv('LILY_CONTEXT_DIR', 'data/context')
                    os.makedirs(base_dir, exist_ok=True)
                    session_file = os.path.join(base_dir, f"{session_id}.json")
                    if hasattr(context_manager, 'load_session_from_file'):
                        context_manager.load_session_from_file(session_id, session_file)
            except Exception as _e:
                print(f"โš ๏ธ [DEBUG] ์ปจํ…์ŠคํŠธ ๋กœ๋“œ ์‹คํŒจ: {_e}")
            context_manager.add_user_message(prompt, metadata={"session_id": session_id})
            print(f"๐Ÿ” [DEBUG] ์‚ฌ์šฉ์ž ๋ฉ”์‹œ์ง€ ์ถ”๊ฐ€๋จ (์„ธ์…˜: {session_id})")
        except Exception as e:
            logger.warning(f"โš ๏ธ ์ปจํ…์ŠคํŠธ ๊ด€๋ฆฌ์ž ์‚ฌ์šฉ ๋ถˆ๊ฐ€: {e}")

    # ์ด๋ฏธ์ง€ ๋ฐ์ดํ„ฐ ์ฒ˜๋ฆฌ
    image_data_list = []
    for img_file in [image1, image2, image3, image4]:
        if img_file:
            try:
                data = await img_file.read()
                image_data_list.append(data)
            except Exception as e:
                logger.warning(f"์ด๋ฏธ์ง€ ๋กœ๋“œ ์‹คํŒจ: {e}")

    try:
        # UX: ์ฒจ๋ถ€ ์ด๋ฏธ์ง€๊ฐ€ ์žˆ์œผ๋ฉด ์ž๋™์œผ๋กœ ๋ฉ€ํ‹ฐ๋ชจ๋‹ฌ ํ—ˆ์šฉ
        if image_data_list and len([img for img in image_data_list if img]) > 0:
            use_rag_images = True
            # ์ด๋ฏธ์ง€๊ฐ€ ์žˆ์œผ๋ฉด ํ…์ŠคํŠธ ์ปจํ…์ŠคํŠธ๋Š” ์œ ์ง€ํ•˜๊ณ , RAG ํ…์ŠคํŠธ๋Š” ๊ธฐ๋ณธ ๊ทธ๋Œ€๋กœ ์‚ฌ์šฉ

        # ํ…์ŠคํŠธ-only ๊ฐ•์ œ: ์ฒจ๋ถ€ ์ด๋ฏธ์ง€๊ฐ€ ์ „ํ˜€ ์—†๊ณ  ํ”Œ๋ž˜๊ทธ๊ฐ€ False๋ฉด ์ด๋ฏธ์ง€ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋น„์›€
        if (not image_data_list or len([img for img in image_data_list if img]) == 0) and not use_rag_images:
            # ์—…๋กœ๋“œ ์งํ›„ 1ํšŒ ํ•œ์ • ์ž๋™ ์ด๋ฏธ์ง€ ํ—ˆ์šฉ ํ”Œ๋ž˜๊ทธ๊ฐ€ ์žˆ์œผ๋ฉด ์†Œ๋น„(pop)ํ•˜์—ฌ True๋กœ ์ „ํ™˜
            try:
                once_flag = pop_flag_for_room(room_id, "use_rag_images_once")
                if once_flag:
                    use_rag_images = True
                    print(f"๐Ÿ” [DEBUG] ๋ฃธ {room_id}์— ์ €์žฅ๋œ 1ํšŒ์„ฑ ์ด๋ฏธ์ง€ ๋ณต๊ตฌ ํ”Œ๋ž˜๊ทธ ์‚ฌ์šฉ -> use_rag_images=True")
            except Exception:
                pass
            image_data_list = []
        # generate_sync ํ•จ์ˆ˜ ํ˜ธ์ถœ (์ปจํ…์ŠคํŠธ ํฌํ•จ)
        result = generate_sync(
            prompt,
            image_data_list,
            # ์ƒ์„ฑ ๊ธธ์ด: ์‹ /๊ตฌ ํŒŒ๋ผ๋ฏธํ„ฐ ๋ชจ๋‘ ์ง€์› (์‹ >๊ตฌ ์šฐ์„ )
            max_length=max_new_tokens,
            use_context=use_context,
            session_id=session_id,
            user_id=user_id,
            room_id=room_id,
            use_rag_images=use_rag_images,
            use_rag_text=use_rag_text,
            document_id=document_id,
            image_short_side=image_short_side,
            input_max_length=input_max_length
        )
        
        if "error" in result:
            raise HTTPException(status_code=500, detail=result["error"])
        
        if use_context:
            try:
                from lily_llm_core.context_manager import context_manager
                context_manager.add_assistant_message(result["generated_text"], metadata={"session_id": session_id})
                # ์ปจํ…์ŠคํŠธ ์˜์†ํ™”: ํ„ด ์ €์žฅ ํ›„ ํŒŒ์ผ๋กœ ์ €์žฅ
                try:
                    persist = os.getenv('LILY_CONTEXT_PERSIST', '0') in ['1', 'true', 'True']
                    if persist:
                        base_dir = os.getenv('LILY_CONTEXT_DIR', 'data/context')
                        os.makedirs(base_dir, exist_ok=True)
                        session_file = os.path.join(base_dir, f"{session_id}.json")
                        if hasattr(context_manager, 'save_session_to_file'):
                            context_manager.save_session_to_file(session_id, session_file)
                    # ์ค‘๊ธฐ(room) ๋ฉ”๋ชจ๋ฆฌ ๊ฐฑ์‹ : ์ตœ๊ทผ ํ„ด ์š”์•ฝ์„ ์••์ถ• ์ €์žฅ
                    try:
                        from lily_llm_core.memory_store import memory_store
                        # ๊ฐ„๋‹จํžˆ ์ตœ๊ทผ ์š”์•ฝ ์ปจํ…์ŠคํŠธ๋ฅผ ์ €์žฅํ•˜๊ณ  ํ‚คํ† ํ”ฝ์€ ๋น„์›€(ํ›„์† ํ™•์žฅ ์ง€์ )
                        summary_text = ""
                        if hasattr(context_manager, 'get_summary_context'):
                            summary_text = context_manager.get_summary_context(session_id)
                        last_ts = time.time()
                        memory_store.upsert_room_memory(room_id, summary_text, "", last_ts)
                    except Exception as _ms:
                        print(f"โš ๏ธ [DEBUG] ๋ฃธ ๋ฉ”๋ชจ๋ฆฌ ์ €์žฅ ์‹คํŒจ: {_ms}")
                except Exception as _e:
                    print(f"โš ๏ธ [DEBUG] ์ปจํ…์ŠคํŠธ ์ €์žฅ ์‹คํŒจ: {_e}")
            except Exception as e:
                logger.warning(f"โš ๏ธ ์ปจํ…์ŠคํŠธ ๊ด€๋ฆฌ์ž ์‚ฌ์šฉ ๋ถˆ๊ฐ€: {e}")

        return GenerateResponse(
            generated_text=result["generated_text"],
            processing_time=result["processing_time"],
            model_name=result["model_name"],
            image_processed=result["image_processed"]
        )
        
    except Exception as e:
        logger.error(f"โŒ ์ƒ์„ฑ ์ค‘ ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"๋ชจ๋ธ ์ƒ์„ฑ ์ค‘ ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {str(e)}")


@router.post("/generate-multimodal", response_model=MultimodalGenerateResponse)
async def generate_multimodal(prompt: str = Form(...),
                             image: UploadFile = File(None),
                             model_id: Optional[str] = Form(None),
                             max_length: Optional[int] = Form(None),
                             temperature: Optional[float] = Form(None),
                             top_p: Optional[float] = Form(None),
                             do_sample: Optional[bool] = Form(None)):
    
    if not is_model_loaded():
        raise HTTPException(status_code=500, detail="๋ชจ๋ธ์ด ๋กœ๋“œ๋˜์ง€ ์•Š์•˜์Šต๋‹ˆ๋‹ค")

    start_time = time.time()

    # ์ด๋ฏธ์ง€ ๋ฐ์ดํ„ฐ ์ฒ˜๋ฆฌ
    image_data_list = []
    if image:
        try:
            data = await image.read()
            image_data_list.append(data)
        except Exception as e:
            logger.error(f"์ด๋ฏธ์ง€ ์ฒ˜๋ฆฌ ์‹คํŒจ: {e}")

    try:
        # generate_sync ํ•จ์ˆ˜ ํ˜ธ์ถœ
        result = generate_sync(prompt, image_data_list, max_length=max_length, 
                             temperature=temperature, top_p=top_p, do_sample=do_sample)
        
        if "error" in result:
            raise HTTPException(status_code=500, detail=result["error"])
        
        from ...services.model_service import get_current_profile
        current_profile = get_current_profile()
        
        return MultimodalGenerateResponse(
            generated_text=result["generated_text"],
            processing_time=result["processing_time"],
            model_name=current_profile.display_name,
            model_id=model_id or current_profile.get_model_info().get("model_name"),
            image_processed=bool(image_data_list)
        )
    except Exception as e:
        logger.error(f"โŒ ๋ฉ€ํ‹ฐ๋ชจ๋‹ฌ ์ƒ์„ฑ ์˜ค๋ฅ˜: {e}")
        raise HTTPException(status_code=500, detail=f"๋ฉ€ํ‹ฐ๋ชจ๋‹ฌ ์ƒ์„ฑ ์‹คํŒจ: {str(e)}")