import torch
from diffusers import DiffusionPipeline
import trimesh
import numpy as np
from PIL import Image
from io import BytesIO

def load_pipeline():
    """
    Load the stable-zero123 model pipeline from Hugging Face.
    """
    ckpt_id = "stabilityai/stable-zero123"
    pipe = DiffusionPipeline.from_pretrained(ckpt_id, torch_dtype=torch.float32).to("cpu")
    return pipe

def generate_3d_model(pipe, prompt, output_path="output.obj", guidance_scale=7.5, num_inference_steps=32):
    """
    Generate a 3D model from the prompt and save it in a Blender-compatible format (.obj).
    """
    # Generate the model output
    outputs = pipe(prompt=prompt, guidance_scale=guidance_scale, num_inference_steps=num_inference_steps)
    
    # Extract mesh data if the output structure allows
    vertices = outputs["vertices"][0].detach().cpu().numpy()
    faces = outputs["faces"][0].detach().cpu().numpy()
    
    # Create and save the mesh using trimesh
    mesh = trimesh.Trimesh(vertices=vertices, faces=faces, process=True)
    mesh.export(output_path)
    return output_path

def convert_to_gif(images, gif_path="output.gif"):
    """
    Convert a list of images into a GIF.
    """
    images[0].save(
        gif_path, save_all=True, append_images=images[1:], loop=0, duration=100
    )
    return gif_path