import json
import logging

from fastapi import APIRouter, Request, HTTPException, Query
from fastapi.responses import PlainTextResponse, JSONResponse

logger = logging.getLogger(__name__)


def create_webhook_router(plugin) -> APIRouter:
    router = APIRouter(prefix="/api/channel/whatsapp", tags=["whatsapp"])

    @router.get("/webhook")
    async def verify_webhook(
        hub_mode: str = Query(None, alias="hub.mode"),
        hub_challenge: str = Query(None, alias="hub.challenge"),
        hub_verify_token: str = Query(None, alias="hub.verify_token"),
    ):
        account = await plugin.config_adapter.resolve_account("default")
        verify_token = account.get("verify_token", "")
        if not verify_token:
            raise HTTPException(status_code=500, detail="verify_token not configured")

        if hub_mode == "subscribe" and hub_verify_token == verify_token:
            logger.info("WhatsApp webhook verified successfully")
            return PlainTextResponse(hub_challenge or "", status_code=200)

        logger.warning("WhatsApp webhook verification failed: token mismatch")
        raise HTTPException(status_code=403, detail="Verification failed")

    @router.post("/webhook")
    async def receive_webhook(request: Request):
        body = await request.body()
        headers = request.headers

        if not plugin.verify_signature(body, headers):
            logger.warning("WhatsApp webhook signature verification failed")
            raise HTTPException(status_code=403, detail="Invalid signature")

        payload = json.loads(body)
        logger.debug("WhatsApp webhook received: %s", json.dumps(payload, indent=2))

        await plugin.handle_webhook(payload)

        return JSONResponse({"status": "ok"})

    return router