# app/main.py
import os
import uuid
import json
import logging

from fastapi import FastAPI, UploadFile, File, Form, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from starlette.responses import JSONResponse

from .pipeline import process_file

logger = logging.getLogger("uvicorn.error")
app = FastAPI(title="HF-Space Data Pipeline API")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

TMP_DIR = os.getenv("TMP_DIR", "/tmp")
os.makedirs(TMP_DIR, exist_ok=True)

@app.get("/health")
def health():
    return {"status": "ok"}

@app.post("/process-file")
async def process_file_endpoint(file: UploadFile = File(...), sheet: str = Form(None)):
    # save uploaded file to /tmp and process synchronously (deterministic)
    filename = file.filename or f"upload-{uuid.uuid4().hex}"
    safe_name = f"{uuid.uuid4().hex}-{filename}"
    path = os.path.join(TMP_DIR, safe_name)
    try:
        contents = await file.read()
        with open(path, "wb") as f:
            f.write(contents)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"failed to save upload: {e}")

    try:
        result = process_file(path, sheet=sheet)
    except Exception as e:
        logger.exception("processing failed")
        raise HTTPException(status_code=500, detail=f"processing failed: {e}")

    return JSONResponse(content=result)

# convenience route to process an existing file path inside the container (dev/testing)
@app.post("/process-path")
def process_path_endpoint(path: str, sheet: str = None):
    if not os.path.exists(path):
        raise HTTPException(status_code=404, detail="file not found")
    try:
        result = process_file(path, sheet=sheet)
    except Exception as e:
        logger.exception("processing failed")
        raise HTTPException(status_code=500, detail=f"processing failed: {e}")
    return JSONResponse(content=result)