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from typing import Any, Dict, List, Optional, Literal, Tuple, Annotated
from operator import add

from pydantic import BaseModel, Field
from langchain_core.messages import BaseMessage
from langgraph.graph import add_messages


_STEPS_RESET_TOKEN = "__RESET_STEPS__"
_MULTI_ANS_RESET_TOKEN = "__RESET_MULTI_ANS__"


def merge_intermediate_steps(old: List[str], new: List[str]) -> List[str]:
    """
    intermediate_steps reducer.

    - ๊ธฐ๋ณธ ๋™์ž‘: old + new (๋ณ‘๋ ฌ ๋…ธ๋“œ์—์„œ ๋™์‹œ์— step์„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ)
    - ๋ฆฌ์…‹ ๋™์ž‘: new์˜ ์ฒซ ์›์†Œ๊ฐ€ _STEPS_RESET_TOKEN ์ด๋ฉด old๋ฅผ ๋ฒ„๋ฆฌ๊ณ  new[1:]๋กœ ๊ต์ฒด
      (์ฒดํฌํฌ์ธํŒ…์œผ๋กœ ๋ˆ„์ ๋œ step์„ '์ด๋ฒˆ ์‹คํ–‰(run)' ๊ธฐ์ค€์œผ๋กœ ์ดˆ๊ธฐํ™”ํ•˜๊ธฐ ์œ„ํ•จ)
    """
    if not new:
        return old
    if new[0] == _STEPS_RESET_TOKEN:
        return new[1:]
    return old + new


def merge_multi_answers(old: List[Dict[str, Any]], new: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
    """
    multi_answers reducer.

    - ๊ธฐ๋ณธ ๋™์ž‘: old + new (๋ณ‘๋ ฌ worker์—์„œ ๋‹ต๋ณ€์„ ๋™์‹œ์— append ๊ฐ€๋Šฅ)
    - ๋ฆฌ์…‹ ๋™์ž‘: new์˜ ์ฒซ ์›์†Œ๊ฐ€ {"__token__": _MULTI_ANS_RESET_TOKEN} ์ด๋ฉด
      old๋ฅผ ๋ฒ„๋ฆฌ๊ณ  new[1:]๋กœ ๊ต์ฒด
      (์ฒดํฌํฌ์ธํŒ…/์Šค๋ ˆ๋“œ ์œ ์ง€๋กœ ์ธํ•ด ์ด์ „ ํ„ด์˜ multi_answers๊ฐ€ ๋ˆ„์ ๋˜๋Š” ๋ฌธ์ œ ๋ฐฉ์ง€)
    """
    if not new:
        return old
    head = new[0]
    if isinstance(head, dict) and head.get("__token__") == _MULTI_ANS_RESET_TOKEN:
        return new[1:]
    return old + new


class SearchResult(BaseModel):
    """๊ฒ€์ƒ‰ ๋„๋ฉ”์ธ์—์„œ ๊ณตํ†ต์œผ๋กœ ์‚ฌ์šฉํ•˜๋Š” ๋‹จ์ผ ๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ ๋ชจ๋ธ."""

    source: str = Field(
        ...,
        description="๊ฒ€์ƒ‰ ์ถœ์ฒ˜ (์˜ˆ: Stack Overflow, ๊ณต์‹ ๋ฌธ์„œ, GitHub Issues ๋“ฑ)",
    )
    content: str = Field(
        ...,
        description="๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ์˜ ํ•ต์‹ฌ ๋‚ด์šฉ ๋˜๋Š” ๋ฐœ์ทŒ ํ…์ŠคํŠธ",
    )
    url: Optional[str] = Field(
        default=None,
        description="๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ์˜ ์›๋ณธ ์ถœ์ฒ˜ URL (์กด์žฌํ•˜๋Š” ๊ฒฝ์šฐ์—๋งŒ ์„ค์ •)",
    )
    relevance_score: Optional[float] = Field(
        default=None,
        description="๊ฒ€์ƒ‰ ์ฟผ๋ฆฌ์™€์˜ ๊ด€๋ จ๋„ ์ ์ˆ˜ (0.0โ€“1.0 ๋ฒ”์œ„, ํด์ˆ˜๋ก ๋” ๊ด€๋ จ ์žˆ์Œ)",
    )


class AgentState(BaseModel):
    """CodeWeaver LangGraph ์—์ด์ „ํŠธ์˜ ์ „์ฒด ์ƒํƒœ๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” Pydantic ๋ชจ๋ธ.
    
    LangGraph ๊ณต์‹ ๊ฐ€์ด๋“œ๋ผ์ธ:
    - Pydantic BaseModel ์‚ฌ์šฉ (ํƒ€์ž… ์•ˆ์ „์„ฑ)
    - messages ํ•„๋“œ์— add_messages reducer ์ ์šฉ
    - ๋ชจ๋“  ํ•„๋“œ์— ๊ธฐ๋ณธ๊ฐ’ ์ œ๊ณต
    """

    # Core fields
    user_question: str = Field(default="", description="์‚ฌ์šฉ์ž์˜ ์›๋ณธ ์งˆ๋ฌธ")
    messages: Annotated[List[BaseMessage], add_messages] = Field(
        default_factory=list,
        description="๋Œ€ํ™” ๋ฉ”์‹œ์ง€ ํžˆ์Šคํ† ๋ฆฌ (add_messages reducer ์‚ฌ์šฉ)"
    )
    
    # Legacy conversation history (์œ ์ง€ํ•˜๋˜ messages ์šฐ์„ )
    conversation_history: Optional[List[Tuple[str, str]]] = Field(
        default=None,
        description="๋ ˆ๊ฑฐ์‹œ ๋Œ€ํ™” ๋‚ด์—ญ (messages ์šฐ์„  ์‚ฌ์šฉ)"
    )
    
    # Intent classification
    detected_intent: Optional[Literal["debugging", "learning", "code_review"]] = Field(
        default=None,
        description="๋ถ„๋ฅ˜๋œ ์งˆ๋ฌธ ์˜๋„"
    )
    
    # Cache-related
    cached_result: Optional[str] = Field(
        default=None,
        description="๋ฒกํ„ฐ DB ์บ์‹œ์—์„œ ์กฐํšŒ๋œ ๋‹ต๋ณ€"
    )
    
    # Search results (Send API๋ฅผ ์œ„ํ•œ reducer ์‚ฌ์šฉ)
    search_results: Annotated[List[SearchResult], add] = Field(
        default_factory=list,
        description="๋ณ‘๋ ฌ ๊ฒ€์ƒ‰์œผ๋กœ ์ˆ˜์ง‘๋œ ๊ฒฐ๊ณผ ๋ฆฌ์ŠคํŠธ (Send API๋กœ ๋ณ‘๋ ฌ ์—…๋ฐ์ดํŠธ)"
    )
    
    # Intermediate processing
    subtask_results: Dict[str, Any] = Field(
        default_factory=dict,
        description="์„œ๋ธŒํƒœ์Šคํฌ ์‹คํ–‰ ๊ฒฐ๊ณผ ์ €์žฅ์†Œ"
    )
    
    # Final output
    final_answer: Optional[str] = Field(
        default=None,
        description="์ตœ์ข… ์ƒ์„ฑ๋œ ๋‹ต๋ณ€"
    )
    
    # Debugging/tracing (๋ณ‘๋ ฌ ๋…ธ๋“œ + ์‹คํ–‰ ๋‹จ์œ„ ๋ฆฌ์…‹ ์ง€์› reducer ์‚ฌ์šฉ)
    intermediate_steps: Annotated[List[str], merge_intermediate_steps] = Field(
        default_factory=list,
        description="์‹คํ–‰ ๋‹จ๊ณ„๋ณ„ ๋กœ๊ทธ (๋ณ‘๋ ฌ ๋…ธ๋“œ์—์„œ ๋™์‹œ ์—…๋ฐ์ดํŠธ ๊ฐ€๋Šฅ)"
    )
    
    # Question analysis & cache eligibility
    question_type: Optional[Literal["clarification", "new_topic", "independent"]] = Field(
        default=None,
        description="์งˆ๋ฌธ ์œ ํ˜• ๋ถ„๋ฅ˜ ๊ฒฐ๊ณผ"
    )
    analysis_reasoning: Optional[str] = Field(
        default=None,
        description="์งˆ๋ฌธ ๋ถ„์„ ์ด์œ "
    )
    should_cache: Optional[bool] = Field(
        default=None,
        description="์บ์‹œ ์ €์žฅ ์—ฌ๋ถ€"
    )
    canonical_question: Optional[str] = Field(
        default=None,
        description="์ •๊ทœํ™”๋œ ์งˆ๋ฌธ (์บ์‹œ์šฉ)"
    )
    
    # Planning & Refinement (Phase 3: Open Deep Research pattern)
    plan: Optional[Dict[str, Any]] = Field(
        default=None,
        description="์งˆ๋ฌธ ๋ถ„ํ•ด ๊ณ„ํš: {'sub_questions': [...], 'reasoning': '...'}"
    )
    needs_refinement: bool = Field(
        default=False,
        description="๊ฒ€์ƒ‰ ๊ฒฐ๊ณผ๊ฐ€ ๋ถ€์กฑํ•˜์—ฌ ์ฟผ๋ฆฌ ๊ฐœ์„  ํ•„์š” ์—ฌ๋ถ€"
    )
    refinement_count: int = Field(
        default=0,
        description="๊ฒ€์ƒ‰ ์ฟผ๋ฆฌ ๊ฐœ์„  ์‹œ๋„ ํšŸ์ˆ˜ (์ตœ๋Œ€ 1ํšŒ)"
    )
    original_question: Optional[str] = Field(
        default=None,
        description="์ฟผ๋ฆฌ ๊ฐœ์„  ์ „ ์›๋ณธ ์งˆ๋ฌธ (์ตœ์ข… ๋‹ต๋ณ€ ์ƒ์„ฑ ์‹œ ์ฐธ์กฐ)"
    )
    
    # Phase 4: Dynamic Parallel Search for Multiple Questions
    is_multi_question: bool = Field(
        default=False,
        description="ํ˜„์žฌ ๋‹ค์ค‘ ์งˆ๋ฌธ ์ฒ˜๋ฆฌ ์ค‘์ธ์ง€ ์—ฌ๋ถ€"
    )
    sub_question_index: int = Field(
        default=0,
        description="์„œ๋ธŒ ์งˆ๋ฌธ ์ธ๋ฑ์Šค (0๋ถ€ํ„ฐ ์‹œ์ž‘)"
    )
    sub_question_text: Optional[str] = Field(
        default=None,
        description="ํ˜„์žฌ ์ฒ˜๋ฆฌ ์ค‘์ธ ์„œ๋ธŒ ์งˆ๋ฌธ ํ…์ŠคํŠธ"
    )
    original_multi_question: Optional[str] = Field(
        default=None,
        description="๋‹ค์ค‘ ์งˆ๋ฌธ์˜ ์›๋ณธ ์งˆ๋ฌธ (ํ†ตํ•ฉ ๋‹ต๋ณ€ ์ƒ์„ฑ ์‹œ ์ฐธ์กฐ)"
    )
    multi_answers: Annotated[List[Dict[str, Any]], merge_multi_answers] = Field(
        default_factory=list,
        description="๋‹ค์ค‘ ์งˆ๋ฌธ์˜ ๊ฐ ๋‹ต๋ณ€ ๋ฆฌ์ŠคํŠธ (reducer๋กœ ์ž๋™ ๋ณ‘ํ•ฉ)"
    )
    
    class Config:
        arbitrary_types_allowed = True