app.py

import gradio as gr
import tempfile, os, subprocess, json

BLENDER = "blender"  # symlinked in Dockerfile

def build_prop(spec_file):
    # Load and sanity-check JSON
    try:
        spec_path = spec_file.name
        with open(spec_path, "r") as f:
            spec = json.load(f)
    except Exception as e:
        return None, f"Invalid JSON: {e}"

    # Minimal schema checks
    ptype = spec.get("type")
    if not ptype:
        return None, "Spec must include a 'type' field (e.g., 'book')."
    if "name" not in spec:
        spec["name"] = f"{ptype}_auto"

    # Route to generator (extend here with more types later)
    generator = "generate_book.py" if ptype == "book" else "generate_book.py"

    out_dir = tempfile.mkdtemp()
    cmd = [BLENDER, "-b", "-P", generator, "--", "--spec", spec_path, "--out", out_dir]

    try:
        run = subprocess.run(cmd, check=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
        logs = run.stdout
    except subprocess.CalledProcessError as e:
        return None, f"Blender failed:\n{e.stdout}"

    # Return first .glb produced
    glbs = [os.path.join(out_dir, f) for f in os.listdir(out_dir) if f.lower().endswith(".glb")]
    if not glbs:
        return None, f"No .glb exported.\nLogs:\n{logs}"
    return glbs[0], "Success."

demo = gr.Interface(
    fn=build_prop,
    inputs=gr.File(label="Upload PropSpec JSON"),
    outputs=[gr.File(label="Generated .glb"), gr.Textbox(label="Log")],
    title="Code‑Generated Props (Blender Headless)",
    description="Upload a JSON PropSpec (supports 'book' for now) and download a .glb.",
    allow_flagging="never"  # prevent write-permission errors on HF Spaces
)

if __name__ == "__main__":
    demo.launch(server_name="0.0.0.0", server_port=int(os.getenv("PORT", "7860")))