import logging
from typing import Any

from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
from pydantic import BaseModel
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import get_current_user
from app.core.config import settings
from app.db.database import AsyncSessionLocal, get_db
from app.db.models import Node, PendingDevice, ScanRun
from app.schemas.nodes import NodeCreate
from app.schemas.scan import PendingDeviceResponse, ScanRunResponse
from app.services.scanner import run_scan


class ScanConfig(BaseModel):
    ranges: list[str]
    interval_seconds: int


logger = logging.getLogger(__name__)
router = APIRouter()


async def _background_scan(run_id: str, ranges: list[str]) -> None:
    async with AsyncSessionLocal() as db:
        await run_scan(ranges, db, run_id)


@router.post("/trigger", response_model=ScanRunResponse)
async def trigger_scan(
    background_tasks: BackgroundTasks,
    db: AsyncSession = Depends(get_db),
    _: str = Depends(get_current_user),
) -> ScanRun:
    ranges = settings.scanner_ranges
    run = ScanRun(status="running", ranges=ranges)
    db.add(run)
    await db.commit()
    await db.refresh(run)
    background_tasks.add_task(_background_scan, run.id, ranges)
    return run


@router.get("/pending", response_model=list[PendingDeviceResponse])
async def list_pending(db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)) -> list[PendingDevice]:
    result = await db.execute(select(PendingDevice).where(PendingDevice.status == "pending"))
    return list(result.scalars().all())


@router.get("/hidden", response_model=list[PendingDeviceResponse])
async def list_hidden(db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)) -> list[PendingDevice]:
    result = await db.execute(select(PendingDevice).where(PendingDevice.status == "hidden"))
    return list(result.scalars().all())


@router.post("/pending/{device_id}/approve", response_model=dict)
async def approve_device(
    device_id: str,
    node_data: NodeCreate,
    db: AsyncSession = Depends(get_db),
    _: str = Depends(get_current_user),
) -> dict[str, Any]:
    device = await db.get(PendingDevice, device_id)
    if device:
        device.status = "approved"
        node = Node(**node_data.model_dump())
        db.add(node)
        await db.commit()
        return {"approved": True, "node_id": node.id}
    return {"approved": False}


@router.post("/pending/{device_id}/hide")
async def hide_device(
    device_id: str, db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)
) -> dict[str, bool]:
    device = await db.get(PendingDevice, device_id)
    if device:
        device.status = "hidden"
        await db.commit()
    return {"hidden": True}


@router.post("/pending/{device_id}/ignore")
async def ignore_device(
    device_id: str, db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)
) -> dict[str, bool]:
    device = await db.get(PendingDevice, device_id)
    if device:
        await db.delete(device)
        await db.commit()
    return {"ignored": True}


@router.get("/runs", response_model=list[ScanRunResponse])
async def list_runs(db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)) -> list[ScanRun]:
    result = await db.execute(select(ScanRun).order_by(ScanRun.started_at.desc()).limit(20))
    return list(result.scalars().all())


@router.get("/config", response_model=ScanConfig)
async def get_scan_config(_: str = Depends(get_current_user)) -> ScanConfig:
    return ScanConfig(
        ranges=settings.scanner_ranges,
        interval_seconds=settings.status_checker_interval,
    )


@router.post("/config", response_model=ScanConfig)
async def update_scan_config(payload: ScanConfig, _: str = Depends(get_current_user)) -> ScanConfig:
    try:
        settings.scanner_ranges = payload.ranges
        settings.status_checker_interval = payload.interval_seconds
        settings.save_overrides()
        return payload
    except Exception as exc:
        raise HTTPException(status_code=500, detail=str(exc)) from exc