import logging

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession

from db.models import Intent, IntentStep
from db.session import get_session
from models.requests import (
    IntentDocumentsUpdateRequest,
    IntentStepUpdateRequest,
    IntentToggleRequest,
)
from models.responses import (
    IntentDocumentsResponse,
    IntentInfo,
    IntentListResponse,
    IntentStepInfo,
    IntentStepListResponse,
)
from services import config_service, intent_document_service, intent_service, intent_step_service

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/intents", tags=["intents"])


async def _to_info(session: AsyncSession, intent: Intent) -> IntentInfo:
    active_cfg = await config_service.get_active_config_for_intent(session, intent.id)
    return IntentInfo(
        id=intent.id,
        code=intent.code,
        name=intent.name,
        description=intent.description or "",
        is_enabled=intent.is_enabled,
        order_index=intent.order_index,
        active_config_id=active_cfg.id if active_cfg else None,
        active_config_version=active_cfg.version if active_cfg else None,
    )


@router.get("", response_model=IntentListResponse)
async def list_intents(session: AsyncSession = Depends(get_session)):
    intents = await intent_service.list_intents(session)
    infos = [await _to_info(session, i) for i in intents]
    return IntentListResponse(intents=infos, total=len(infos))


@router.get("/{code}", response_model=IntentInfo)
async def get_intent(code: str, session: AsyncSession = Depends(get_session)):
    intent = await intent_service.get_intent_by_code(session, code)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    return await _to_info(session, intent)


@router.patch("/{code}", response_model=IntentInfo)
async def toggle_intent(
    code: str,
    req: IntentToggleRequest,
    session: AsyncSession = Depends(get_session),
):
    intent = await intent_service.set_intent_enabled(session, code, req.is_enabled)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    return await _to_info(session, intent)


def _step_to_info(step: IntentStep, intent_code: str) -> IntentStepInfo:
    return IntentStepInfo(
        id=step.id,
        intent_id=step.intent_id,
        intent_code=intent_code,
        code=step.code,
        name=step.name,
        order_index=step.order_index,
        system_prompt=step.system_prompt or "",
        allowed_next=intent_step_service.parse_allowed_next(step),
        guards=intent_step_service.parse_guards(step),
        updated_at=step.updated_at.isoformat(),
    )


@router.get("/{code}/steps", response_model=IntentStepListResponse)
async def list_intent_steps(code: str, session: AsyncSession = Depends(get_session)):
    intent = await intent_service.get_intent_by_code(session, code)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    steps = await intent_step_service.list_steps_for_intent(session, intent.id)
    return IntentStepListResponse(
        intent_code=intent.code,
        steps=[_step_to_info(s, intent.code) for s in steps],
        total=len(steps),
    )


@router.patch("/{code}/steps/{step_code}", response_model=IntentStepInfo)
async def update_intent_step(
    code: str,
    step_code: str,
    req: IntentStepUpdateRequest,
    session: AsyncSession = Depends(get_session),
):
    intent = await intent_service.get_intent_by_code(session, code)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    step = await intent_step_service.get_step_by_code(session, intent.id, step_code)
    if step is None:
        raise HTTPException(status_code=404, detail="Step not found")
    updated = await intent_step_service.update_step(
        session, step,
        name=req.name,
        system_prompt=req.system_prompt,
        allowed_next=req.allowed_next,
        guards=req.guards,
    )
    return _step_to_info(updated, intent.code)


@router.get("/{code}/documents", response_model=IntentDocumentsResponse)
async def list_intent_documents(code: str, session: AsyncSession = Depends(get_session)):
    intent = await intent_service.get_intent_by_code(session, code)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    document_ids = await intent_document_service.list_documents_for_intent(session, intent.id)
    return IntentDocumentsResponse(intent_code=intent.code, document_ids=document_ids)


@router.put("/{code}/documents", response_model=IntentDocumentsResponse)
async def set_intent_documents(
    code: str,
    req: IntentDocumentsUpdateRequest,
    session: AsyncSession = Depends(get_session),
):
    intent = await intent_service.get_intent_by_code(session, code)
    if intent is None:
        raise HTTPException(status_code=404, detail="Intent not found")
    document_ids = await intent_document_service.set_documents_for_intent(
        session, intent.id, req.document_ids,
    )
    return IntentDocumentsResponse(intent_code=intent.code, document_ids=document_ids)