import torch
from transformers import IdeficsForVisionText2Text, AutoProcessor
from peft import PeftModel, PeftConfig
import gradio as gr

peft_model_id = "mrm8488/idefics-9b-ft-describe-diffusion-bf16-adapter"
device = "cuda" if torch.cuda.is_available() else "cpu"


config = PeftConfig.from_pretrained(peft_model_id)
model = IdeficsForVisionText2Text.from_pretrained(config.base_model_name_or_path, torch_dtype=torch.bfloat16)
model = PeftModel.from_pretrained(model, peft_model_id)
processor = AutoProcessor.from_pretrained(config.base_model_name_or_path)
model = model.to(device)
model.eval()

def predict(prompt, image_url, max_length):
    image = processor.image_processor.fetch_images(image_url)
    prompts = [[image, prompt]]
    inputs = processor(prompts[0], return_tensors="pt").to(device)
    generated_ids = model.generate(**inputs, max_length=max_length)
    generated_text = processor.batch_decode(generated_ids, skip_special_tokens=True)[0]
    return generated_text



title = "Midjourney-like Image Captioning with IDEFICS"
description = "Gradio Demo for generating *Midjourney* like captions (describe functionality) with **IDEFICS**"

examples = [
    ["Describe the following image:", "https://cdn.arstechnica.net/wp-content/uploads/2023/06/zoomout_2-1440x807.jpg", 64],
    ["Describe the following image:", "https://framerusercontent.com/images/inZdRVn7eafZNvaVre2iW1a538.png", 64],
    ["Describe the following image:", "https://hips.hearstapps.com/hmg-prod/images/cute-photos-of-cats-in-grass-1593184777.jpg", 64]
    
]
io = gr.Interface(fn=predict, 
                  #inputs=gr.inputs.Image(type='pil'),
                  inputs=[
                      gr.Textbox(label="Prompt", value="Describe the following image:"),
                      gr.Textbox(label="image URL", placeholder="Insert the URL of the image to be described"),
                      gr.Slider(label="Max tokens", value=64, max=128, min=16, step=8)
                  ],
                  outputs=gr.Textbox(label="IDEFICS Description"),
                  title=title, description=description, examples=examples,
                  allow_flagging=False, allow_screenshot=False)
io.launch(debug=True)