from fastapi import APIRouter, UploadFile, File, HTTPException, Depends, Header, Request
from typing import List, Optional
from pydantic import BaseModel, Field, validator
from model.response import StandardResponse

from db.session import get_db
from sqlalchemy.orm import Session
from service.trunks_service import TrunksService
import logging

router = APIRouter(prefix="/dify", tags=["Dify Knowledge Base"])


# --- Data Models ---
class RetrievalSetting(BaseModel):
    top_k: int
    score_threshold: float

class MetadataCondition(BaseModel):
    name: List[str]
    comparison_operator: str = Field(..., pattern=r'^(equals|not_equals|contains|not_contains|starts_with|ends_with|empty|not_empty|greater_than|less_than)$')
    value: Optional[str] = Field(None)

    @validator('value')
    def validate_value(cls, v, values):
        operator = values.get('comparison_operator')
        if operator in ['empty', 'not_empty'] and v is not None:
            raise ValueError('Value must be None for empty/not_empty operators')
        if operator not in ['empty', 'not_empty'] and v is None:
            raise ValueError('Value is required for this comparison operator')
        return v

class MetadataFilter(BaseModel):
    logical_operator: str = Field(default="and", pattern=r'^(and|or)$')
    conditions: List[MetadataCondition] = Field(..., min_items=1)

    @validator('conditions')
    def validate_conditions(cls, v):
        if len(v) < 1:
            raise ValueError('At least one condition is required')
        return v

class DifyRetrievalRequest(BaseModel):
    knowledge_id: str
    query: str
    retrieval_setting: RetrievalSetting
    metadata_condition: Optional[MetadataFilter] = Field(default=None, exclude=True)

class KnowledgeRecord(BaseModel):
    content: str
    score: float
    title: str
    metadata: dict

# --- Authentication ---
async def verify_api_key(authorization: str = Header(...)):
    logger.info(f"Received authorization header: {authorization}")  # 新增日志
    if not authorization.startswith("Bearer "):
        raise HTTPException(
            status_code=403,
            detail=StandardResponse(
                success=False,
                error_code=1001,
                error_msg="Invalid Authorization header format"
            )
        )
    api_key = authorization[7:]
    # TODO: Implement actual API key validation logic
    if not api_key:
        raise HTTPException(
            status_code=403,
            detail=StandardResponse(
                success=False,
                error_code=1002,
                error_msg="Authorization failed"
            )
        )
    return api_key

logger = logging.getLogger(__name__)

@router.post("/retrieval", response_model=StandardResponse)
async def dify_retrieval(
    payload: DifyRetrievalRequest,
    request: Request,
    authorization: str = Depends(verify_api_key),
    db: Session = Depends(get_db),
    conversation_id: Optional[str] = None
):
    logger.info(f"All headers: {dict(request.headers)}")
    logger.info(f"Request body: {payload.model_dump()}")
    
    try:
        logger.info(f"Starting retrieval for knowledge base {payload.knowledge_id} with query: {payload.query}")
        
        trunks_service = TrunksService()
        search_results = trunks_service.search_by_vector(payload.query, payload.retrieval_setting.top_k, conversation_id=conversation_id)
        
        if not search_results:
            logger.warning(f"No results found for query: {request.query}")
            return StandardResponse(
                success=True,
                records=[]
            )
        
        # 格式化返回结果
        records = [{
            "metadata": {
                "path": result["file_path"],
                "description": str(result["id"])
            },
            "score": result["distance"],
            "title": result["file_path"].split("/")[-1],
            "content": result["content"]
        } for result in search_results]
        
        logger.info(f"Retrieval completed successfully for query: {payload.query}")
        return StandardResponse(
            success=True,
            records=records
        )

    except HTTPException as e:
        logger.error(f"HTTPException occurred: {str(e)}")
        raise
    except Exception as e:
        logger.error(f"Unexpected error occurred: {str(e)}")
        raise HTTPException(
            status_code=500,
            detail=StandardResponse(
                success=False,
                error_code=500,
                error_msg=str(e)
            )
        )

@router.post("/chatflow_retrieval", response_model=StandardResponse)
async def dify_chatflow_retrieval(
    knowledge_id: str,
    query: str,
    top_k: int,
    score_threshold: float,
    conversation_id: str,
    request: Request,
    authorization: str = Depends(verify_api_key),
    db: Session = Depends(get_db)
):
    payload = DifyRetrievalRequest(
        knowledge_id=knowledge_id,
        query=query,
        retrieval_setting=RetrievalSetting(top_k=top_k, score_threshold=score_threshold)
    )
    return await dify_retrieval(payload, request, authorization, db, conversation_id=conversation_id)

dify_kb_router = router