import hashlib
import hmac
import json
from datetime import datetime
from uuid import uuid4

from fastapi import APIRouter, HTTPException, Request

# ws_relay의 broadcast 함수 임포트 (순환 참조 방지를 위해 지연 임포트)
router = APIRouter(prefix="/api")

WEBHOOK_SECRET = "guardia-webhook-secret-2026"

ITSM_URL = "http://localhost:8001"   # ITSM 서버 주소

TYPE_KR = {"DEPLOY":"배포", "RESTART":"재기동", "LOG":"로그 분석",
           "INQUIRY":"문의", "OTHER":"기타"}


def _verify(signature: str, body: bytes) -> bool:
    expected = "sha256=" + hmac.new(
        WEBHOOK_SECRET.encode(), body, hashlib.sha256
    ).hexdigest()
    return hmac.compare_digest(expected, signature)


def _new_msg_id() -> str:
    return f"MSG-{datetime.now().strftime('%Y%m%d')}-{str(uuid4())[:8].upper()}"


def _new_sr() -> str:
    return f"SR-{datetime.now().strftime('%Y%m%d')}-{str(uuid4())[:6].upper()}"


@router.post("/messenger/webhook")
async def receive_webhook(request: Request):
    from routers.ws_relay import broadcast, room_channels
    from core.bot import store_message

    body = await request.body()
    payload = json.loads(body)

    # ── ITSM 완료 이벤트 처리 ─────────────────────────────────────────
    if payload.get("event") == "itsm_complete":
        room   = payload.get("room", "ops")
        sr_id  = payload.get("sr_id", "")
        title  = payload.get("title", "SR 처리 완료")
        s_type = TYPE_KR.get(payload.get("sr_type",""), payload.get("sr_type",""))
        req_by = payload.get("requested_by", "고객")
        server = payload.get("target_server", "—")
        summary = payload.get("result_summary", "처리 완료")

        content = (
            f"✅ **{title}** 처리 완료\n"
            f"• SR: `{sr_id}`  유형: {s_type}\n"
            f"• 요청자: {req_by}  대상: {server}\n"
            f"• 결과: {summary}\n\n"
            f"서비스에 만족하셨나요? 아래에서 평가해 주세요."
        )
        bot_msg = {
            "message_id":  _new_msg_id(),
            "timestamp":   datetime.now().isoformat(),
            "room_id":     room,
            "sender":      "GUARDiA-Bot",
            "sender_type": "BOT",
            "msg_type":    "CHAT",
            "content":     content,
            "is_widget":   True,
            "interactive_action": {
                "type":    "STAR_RATING",
                "sr_id":   sr_id,
                "customer": req_by,
                "itsm_url": ITSM_URL,
            },
        }
        store_message(room, bot_msg)
        await broadcast(room, bot_msg)
        return {"status": "NOTIFIED", "room": room, "sr_id": sr_id}

    # ── 일반 웹훅 (기존 로직) ─────────────────────────────────────────
    if payload.get("bot") or not payload.get("text", "").strip():
        return {"status": "IGNORED"}

    sr_id = _new_sr()
    return {"status": "ACCEPTED", "sr_id": sr_id}


@router.post("/sr/approve/{sr_id}")
async def approve_sr(sr_id: str):
    return {"status": "APPROVED", "sr_id": sr_id, "message": f"SR {sr_id} 승인 완료 — 실행을 시작합니다."}


@router.post("/sr/reject/{sr_id}")
async def reject_sr(sr_id: str):
    return {"status": "REJECTED", "sr_id": sr_id, "message": f"SR {sr_id} 반려 처리되었습니다."}


@router.post("/killswitch/confirm")
async def killswitch_confirm():
    return {"status": "STOPPED", "message": "모든 진행 중인 작업이 중단되었습니다."}


@router.post("/killswitch/cancel")
async def killswitch_cancel():
    return {"status": "CANCELLED", "message": "Kill-Switch 취소되었습니다."}