from __future__ import annotations

from datetime import datetime

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

from ...core.database import get_db
from ...core.response import error_response, success_response
from ...dependencies import get_current_user
from ...models import User
from ...schemas.rag import QASessionListQuery, RAGAskRequest
from ...schemas.space import SavedIdeaCreateRequest, SavedIdeaListResponse, SavedIdeaPromoteResponse, SavedIdeaUpdateRequest
from ...services.ai_pmo.ai_pmo_kernel import AIPMOKernelService
from ...services.adaptive_rag_service import AdaptiveRAGService
from ...services.pmflow_launch_service import PMFlowLaunchError
from ...services.space_saved_idea_service import SavedIdeaError, SpaceSavedIdeaService
from .. import rag_ask_contract

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


@router.get("/ai-concierge/status")
async def get_ai_concierge_status(
    current_user: User = Depends(get_current_user),
):
    return success_response(
        {
            "chat": "available",
            "history": "available",
            "actions": "available",
            "tenant_id": int(current_user.tenant_id),
        }
    )


@router.post("/ai-concierge/ask")
async def ask_ai_concierge(
    body: RAGAskRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = AIPMOKernelService(db, tenant_id=int(current_user.tenant_id))
    ingress_result = await service.process_ingress(
        **rag_ask_contract.build_kernel_ingress_kwargs(
            request=body,
            current_user=current_user,
        )
    )
    if not bool(ingress_result.get("handled")):
        raise HTTPException(
            status_code=400,
            detail=str(ingress_result.get("reason") or "space_ai_concierge_not_handled"),
        )
    payload = rag_ask_contract.build_rag_response_payload(ingress_result=ingress_result)
    if not str(payload.get("answer") or "").strip() and not str(payload.get("reply_text") or "").strip():
        return JSONResponse(status_code=500, content=error_response(500, "AI 管家没有返回可用回答。"))
    return success_response(payload)


@router.get("/ai-concierge/sessions")
async def list_ai_concierge_sessions(
    date_from: datetime | None = Query(default=None),
    date_to: datetime | None = Query(default=None),
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = QASessionListQuery(
        date_from=date_from,
        date_to=date_to,
        page=page,
        page_size=page_size,
    )
    service = AdaptiveRAGService(db, tenant_id=int(current_user.tenant_id))
    result = await service.list_qa_sessions(
        user_id=int(current_user.id),
        date_from=query.date_from,
        date_to=query.date_to,
        page=query.page,
        page_size=query.page_size,
    )
    return success_response(result)


@router.get("/ai-concierge/sessions/{session_id}")
async def get_ai_concierge_session(
    session_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = AdaptiveRAGService(db, tenant_id=int(current_user.tenant_id))
    try:
        result = await service.get_qa_session_detail(session_id=session_id, user_id=int(current_user.id))
    except ValueError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    return success_response(result)


@router.get("/saved-ideas")
async def list_saved_ideas(
    limit: int = Query(default=20, ge=1, le=100),
    include_archived: bool = False,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = SpaceSavedIdeaService(db, tenant_id=int(current_user.tenant_id))
    items = await service.list_ideas(
        user_id=int(current_user.id),
        limit=limit,
        include_archived=include_archived,
    )
    return success_response(SavedIdeaListResponse(items=items).model_dump(mode="json"))


@router.post("/saved-ideas")
async def create_saved_idea(
    body: SavedIdeaCreateRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = SpaceSavedIdeaService(db, tenant_id=int(current_user.tenant_id))
    try:
        item = await service.create_idea(body=body, user_id=int(current_user.id))
    except SavedIdeaError as exc:
        return JSONResponse(status_code=exc.status_code, content=error_response(exc.status_code, f"{exc.code}: {exc.message}"))
    return success_response(item.model_dump(mode="json"))


@router.patch("/saved-ideas/{idea_id}")
async def update_saved_idea(
    idea_id: str,
    body: SavedIdeaUpdateRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = SpaceSavedIdeaService(db, tenant_id=int(current_user.tenant_id))
    try:
        item = await service.update_idea(idea_id=idea_id, body=body, user_id=int(current_user.id))
    except SavedIdeaError as exc:
        return JSONResponse(status_code=exc.status_code, content=error_response(exc.status_code, f"{exc.code}: {exc.message}"))
    return success_response(item.model_dump(mode="json"))


@router.post("/saved-ideas/{idea_id}/archive")
async def archive_saved_idea(
    idea_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = SpaceSavedIdeaService(db, tenant_id=int(current_user.tenant_id))
    try:
        item = await service.archive_idea(idea_id=idea_id, user_id=int(current_user.id))
    except SavedIdeaError as exc:
        return JSONResponse(status_code=exc.status_code, content=error_response(exc.status_code, f"{exc.code}: {exc.message}"))
    return success_response(item.model_dump(mode="json"))


@router.post("/saved-ideas/{idea_id}/promote")
async def promote_saved_idea(
    idea_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = SpaceSavedIdeaService(db, tenant_id=int(current_user.tenant_id))
    try:
        idea, draft = await service.promote_to_launch_draft(idea_id=idea_id, user_id=int(current_user.id))
    except SavedIdeaError as exc:
        return JSONResponse(status_code=exc.status_code, content=error_response(exc.status_code, f"{exc.code}: {exc.message}"))
    except PMFlowLaunchError as exc:
        return JSONResponse(status_code=exc.status_code, content=error_response(exc.status_code, f"{exc.code}: {exc.message}"))
    payload = SavedIdeaPromoteResponse(
        idea=idea,
        draft=draft,
        redirect_url="/project-launch?state=human_review",
    )
    return success_response(payload.model_dump(mode="json"))


__all__ = ["router"]