from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse
import subprocess, tempfile, base64, os

app = FastAPI()

@app.post("/convert/heic-to-jpeg")
async def convert(request: Request):
    body = await request.json()
    with tempfile.TemporaryDirectory() as tmpdir:
        heic_path = os.path.join(tmpdir, "input.heic")
        jpeg_path = os.path.join(tmpdir, "output.jpg")

        with open(heic_path, "wb") as f:
            f.write(base64.b64decode(body["base64"]))

        subprocess.run(
            ["sips", "-s", "format", "jpeg", heic_path, "--out", jpeg_path],
            capture_output=True, timeout=30, check=True
        )

        with open(jpeg_path, "rb") as f:
            jpeg_b64 = base64.b64encode(f.read()).decode()

    return JSONResponse({"base64": jpeg_b64, "format": "jpeg"})