"""
Device events endpoints (BLE and WiFi).
"""

import gzip
import json
from typing import Annotated

from fastapi import APIRouter, Depends, Header, HTTPException, Request, status
from pydantic import BaseModel
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.models.device import Device

router = APIRouter()


class EventsResponse(BaseModel):
    """Events batch response."""

    ok: bool = True
    received: int


async def _auth_device_token(
    authorization: str | None, db: AsyncSession
) -> Device:
    """Authenticate device by token from Authorization header."""
    if not authorization or not authorization.lower().startswith("bearer "):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Missing token",
        )

    token = authorization.split(None, 1)[1]

    result = await db.execute(select(Device).where(Device.device_token == token))
    device = result.scalar_one_or_none()

    if not device:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token",
        )

    return device


def _read_body(body: bytes, content_encoding: str | None) -> dict:
    """Decompress and parse request body."""
    raw = body
    if content_encoding and content_encoding.lower() == "gzip":
        raw = gzip.decompress(body)
    return json.loads(raw.decode("utf-8"))


@router.post("/ble", response_model=EventsResponse)
async def ble_batch(
    request: Request,
    db: Annotated[AsyncSession, Depends(get_db)],
    content_encoding: Annotated[str | None, Header()] = None,
    authorization: Annotated[str | None, Header()] = None,
):
    """
    Receive batch of BLE scan events.

    Body can be gzip compressed (Content-Encoding: gzip).
    """
    device = await _auth_device_token(authorization, db)

    payload = _read_body(await request.body(), content_encoding)
    count = int(payload.get("count", 0) or len(payload.get("events", [])))

    # TODO: Store in ClickHouse
    print(
        f"[BLE BATCH] device={device.mac_address} simple_id={device.simple_id} count={count}"
    )

    return EventsResponse(ok=True, received=count)


@router.post("/wifi", response_model=EventsResponse)
async def wifi_batch(
    request: Request,
    db: Annotated[AsyncSession, Depends(get_db)],
    content_encoding: Annotated[str | None, Header()] = None,
    authorization: Annotated[str | None, Header()] = None,
):
    """
    Receive batch of WiFi probe request events.

    Body can be gzip compressed (Content-Encoding: gzip).
    """
    device = await _auth_device_token(authorization, db)

    payload = _read_body(await request.body(), content_encoding)
    count = int(payload.get("count", 0) or len(payload.get("events", [])))

    # TODO: Store in ClickHouse
    print(
        f"[WIFI BATCH] device={device.mac_address} simple_id={device.simple_id} count={count}"
    )

    return EventsResponse(ok=True, received=count)