"""API route for IFC file upload and parsing."""

import os
from pathlib import Path
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, UploadFile
from fastapi.responses import FileResponse
from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.models.database import get_db
from app.schemas.element import ProjectOut
from app.services.ifc_parser import parse_ifc_file
from app.services.ifc_converter import convert_ifc_bytes_to_glb

router = APIRouter(tags=["upload"])

GLB_DIR = Path(settings.upload_dir) / "glb"


@router.post("/upload", response_model=ProjectOut)
async def upload_ifc(file: UploadFile, db: AsyncSession = Depends(get_db)):
    """Upload an IFC file, parse it, and store elements in the database."""
    if not file.filename.lower().endswith(".ifc"):
        raise HTTPException(status_code=400, detail="Only .ifc files are accepted")

    contents = await file.read()

    # Parse semantic data into database
    try:
        project = await parse_ifc_file(
            filename=file.filename,
            content=contents,
            db=db,
        )
    except Exception as e:
        raise HTTPException(status_code=422, detail=f"Failed to parse IFC file: {e}")

    # Convert geometry to glb
    try:
        GLB_DIR.mkdir(parents=True, exist_ok=True)
        glb_path = str(GLB_DIR / f"{project.id}.glb")
        await convert_ifc_bytes_to_glb(contents, glb_path)
    except Exception as e:
        # Log but don't fail — semantic data is still usable without 3D
        print(f"WARNING: glb conversion failed: {e}")

    return project


@router.get("/projects/{project_id}/model.glb")
async def get_model_glb(project_id: UUID):
    """Serve the pre-converted glb file for 3D viewing."""
    glb_path = GLB_DIR / f"{project_id}.glb"

    if not glb_path.exists():
        raise HTTPException(status_code=404, detail="3D model not found")

    return FileResponse(
        path=str(glb_path),
        media_type="model/gltf-binary",
        filename=f"{project_id}.glb",
    )