import argparse
import gradio as gr
import torch
from PIL import Image

from donut import DonutModel

def demo_process_vqa(input_img, question):
    global pretrained_model, task_prompt, task_name
    input_img = Image.fromarray(input_img)
    user_prompt = task_prompt.replace("{user_input}", question)
    output = pretrained_model.inference(input_img, prompt=user_prompt)["predictions"][0]
    return output


def demo_process(input_img):
    global pretrained_model, task_prompt, task_name
    input_img = Image.fromarray(input_img)
    output = pretrained_model.inference(image=input_img, prompt=task_prompt)["predictions"][0]
    return output


parser = argparse.ArgumentParser()
parser.add_argument("--task", type=str, default="zhtrainticket")
parser.add_argument("--pretrained_path", type=str, default="/home/wanglch/projects/donut/naver-clova-ix/donut-base-finetuned-zhtrainticket")
args, left_argv = parser.parse_known_args()

task_name = args.task
if "docvqa" == task_name:
    task_prompt = "<s_docvqa><s_question>{user_input}</s_question><s_answer>"
else:  # rvlcdip, cord, ...
    task_prompt = f"<s_{task_name}>"

pretrained_model = DonutModel.from_pretrained(args.pretrained_path)

if torch.cuda.is_available():
    pretrained_model.half()
    device = torch.device("cuda")
    pretrained_model.to(device)
else:
    pretrained_model.encoder.to(torch.bfloat16)

pretrained_model.eval()

demo = gr.Interface(
    fn=demo_process_vqa if task_name == "docvqa" else demo_process,
    inputs=["image", "text"] if task_name == "docvqa" else "image",
    outputs="json",
    title=f"Donut 🍩 demonstration for `{task_name}` task",
)
demo.launch()