from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.orm import Session

from app.auth.dependencies import get_current_user, require_role
from app.db.session import get_db
from app.models import Asset, User
from app.schemas.core import AssetCreate, AssetRead, AssetUpdate

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


def _asset_to_read(asset: Asset) -> AssetRead:
    return AssetRead(
        id=asset.id,
        name=asset.name,
        asset_type=asset.asset_type,
        address=asset.address,
        status=asset.status,
        metadata=asset.extra,
        created_at=asset.created_at,
        updated_at=asset.updated_at,
    )


@router.get("", response_model=list[AssetRead])
def list_assets(_: User = Depends(get_current_user), db: Session = Depends(get_db)) -> list[AssetRead]:
    assets = db.scalars(select(Asset).order_by(Asset.name)).all()
    return [_asset_to_read(asset) for asset in assets]


@router.post("", response_model=AssetRead)
def create_asset(
    payload: AssetCreate,
    _: User = Depends(require_role("admin")),
    db: Session = Depends(get_db),
) -> AssetRead:
    asset = Asset(
        name=payload.name,
        asset_type=payload.asset_type,
        address=payload.address,
        extra=payload.metadata,
    )
    db.add(asset)
    db.commit()
    db.refresh(asset)
    return _asset_to_read(asset)


@router.get("/{asset_id}", response_model=AssetRead)
def get_asset(asset_id: int, _: User = Depends(get_current_user), db: Session = Depends(get_db)) -> AssetRead:
    asset = db.get(Asset, asset_id)
    if asset is None:
        raise HTTPException(status_code=404, detail="Asset not found")
    return _asset_to_read(asset)


@router.patch("/{asset_id}", response_model=AssetRead)
def update_asset(
    asset_id: int,
    payload: AssetUpdate,
    _: User = Depends(require_role("admin")),
    db: Session = Depends(get_db),
) -> AssetRead:
    asset = db.get(Asset, asset_id)
    if asset is None:
        raise HTTPException(status_code=404, detail="Asset not found")

    changes = payload.model_dump(exclude_unset=True)
    if "metadata" in changes:
        asset.extra = changes.pop("metadata")
    for field, value in changes.items():
        setattr(asset, field, value)

    db.commit()
    db.refresh(asset)
    return _asset_to_read(asset)


@router.delete("/{asset_id}", status_code=204)
def delete_asset(
    asset_id: int,
    _: User = Depends(require_role("admin")),
    db: Session = Depends(get_db),
) -> None:
    asset = db.get(Asset, asset_id)
    if asset is None:
        raise HTTPException(status_code=404, detail="Asset not found")
    db.delete(asset)
    db.commit()