import logging
from typing import TYPE_CHECKING

from fastapi import APIRouter, Depends, HTTPException, Query, status
from pydantic import BaseModel, Field

from app.api.deps import get_current_user, get_key_manager
from app.models.user import User
from app.services.ai_engine.base import AIQueryResult, EngineType
from app.services.ai_engine.batch_query import BatchQueryService, get_batch_service as _get_batch_service
from app.services.ai_engine.chatgpt import ChatGPTAdapter
from app.services.ai_engine.doubao import DoubaoAdapter
from app.services.ai_engine.kimi import KimiAdapter
from app.services.ai_engine.perplexity import PerplexityAdapter
from app.services.ai_engine.wenxin import WenxinAdapter
from app.services.ai_engine.yuanbao import YuanbaoAdapter

if TYPE_CHECKING:
    from app.services.api_key_manager import APIKeyManager

logger = logging.getLogger(__name__)

router = APIRouter()


class SingleQueryRequest(BaseModel):
    engine: str
    query: str = Field(min_length=1, max_length=500)
    brand_name: str = Field(min_length=1, max_length=200)
    competitor_names: list[str] | None = None


class BatchQueryRequest(BaseModel):
    engines: list[str] = Field(min_length=1)
    query: str = Field(min_length=1, max_length=500)
    brand_name: str = Field(min_length=1, max_length=200)
    competitor_names: list[str] | None = None


class QueryResultResponse(BaseModel):
    engine_type: str
    query: str
    raw_response: str
    has_brand_citation: bool
    has_competitor_citation: bool
    brand_context: str | None
    competitor_contexts: list[str]
    response_time_ms: int
    timestamp: str

    model_config = {"from_attributes": True}


class CitationRateResponse(BaseModel):
    total_engines: int
    brand_citation_count: int
    brand_citation_rate: float
    competitor_citation_count: int
    competitor_citation_rate: float


class BatchQueryResponse(BaseModel):
    results: list[QueryResultResponse]
    citation_rate: CitationRateResponse
    avg_response_time_ms: float = 0.0


def _result_to_response(r: AIQueryResult) -> QueryResultResponse:
    return QueryResultResponse(
        engine_type=r.engine_type.value,
        query=r.query,
        raw_response=r.raw_response,
        has_brand_citation=r.has_brand_citation,
        has_competitor_citation=r.has_competitor_citation,
        brand_context=r.brand_context,
        competitor_contexts=r.competitor_contexts,
        response_time_ms=r.response_time_ms,
        timestamp=r.timestamp.isoformat(),
    )


def _parse_engine(value: str) -> EngineType:
    try:
        return EngineType(value)
    except ValueError:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Unknown engine: {value}",
        )


async def _execute_batch(
    service: BatchQueryService,
    engine_types: list[EngineType],
    query: str,
    brand_name: str,
    competitor_names: list[str] | None,
) -> BatchQueryResponse:
    results = await service.query_batch(
        engine_types, query, brand_name, competitor_names
    )
    citation_rate = service.calculate_citation_rate(results)
    response_results = [_result_to_response(r) for r in results]
    avg_response_time = (
        sum(r.response_time_ms for r in results) / len(results)
        if results
        else 0.0
    )
    return BatchQueryResponse(
        results=response_results,
        citation_rate=CitationRateResponse(**citation_rate),
        avg_response_time_ms=avg_response_time,
    )


@router.post("/query", response_model=QueryResultResponse)
async def query_single_engine(
    request: SingleQueryRequest,
    current_user: User = Depends(get_current_user),
    key_manager: "APIKeyManager | None" = Depends(get_key_manager),
):
    service = _get_batch_service(key_manager=key_manager, user_id=str(current_user.id))
    service.set_user_context(str(current_user.id))
    engine_type = _parse_engine(request.engine)
    try:
        result = await service.query_single(
            engine_type, request.query, request.brand_name, request.competitor_names
        )
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )
    return _result_to_response(result)


@router.post("/query-batch", response_model=BatchQueryResponse)
async def query_batch_engines(
    request: BatchQueryRequest,
    current_user: User = Depends(get_current_user),
    key_manager: "APIKeyManager | None" = Depends(get_key_manager),
):
    service = _get_batch_service(key_manager=key_manager, user_id=str(current_user.id))
    service.set_user_context(str(current_user.id))
    engine_types = [_parse_engine(e) for e in request.engines]
    return await _execute_batch(
        service, engine_types, request.query, request.brand_name, request.competitor_names
    )


@router.get("/results", response_model=BatchQueryResponse)
async def get_query_results(
    engines: str = Query(..., description="Comma-separated engine names"),
    query: str = Query(..., min_length=1, max_length=500),
    brand_name: str = Query(..., min_length=1, max_length=200),
    competitor_names: str | None = Query(None, description="Comma-separated competitor names"),
    current_user: User = Depends(get_current_user),
    key_manager: "APIKeyManager | None" = Depends(get_key_manager),
):
    service = _get_batch_service(key_manager=key_manager, user_id=str(current_user.id))
    service.set_user_context(str(current_user.id))
    engine_list = [e.strip() for e in engines.split(",") if e.strip()]
    engine_types = [_parse_engine(e) for e in engine_list]
    comp_names = (
        [n.strip() for n in competitor_names.split(",") if n.strip()]
        if competitor_names
        else None
    )
    return await _execute_batch(
        service, engine_types, query, brand_name, comp_names
    )