import gradio as gr
from transformers import Pix2StructForConditionalGeneration, Pix2StructProcessor
import requests
from PIL import Image
import torch

torch.hub.download_url_to_file('https://raw.githubusercontent.com/vis-nlp/ChartQA/main/ChartQA%20Dataset/val/png/20294671002019.png', 'chart_example.png')
torch.hub.download_url_to_file('https://raw.githubusercontent.com/vis-nlp/ChartQA/main/ChartQA%20Dataset/test/png/multi_col_1081.png', 'chart_example_2.png')
torch.hub.download_url_to_file('https://raw.githubusercontent.com/vis-nlp/ChartQA/main/ChartQA%20Dataset/test/png/18143564004789.png', 'chart_example_3.png')
torch.hub.download_url_to_file('https://sharkcoder.com/files/article/matplotlib-bar-plot.png', 'chart_example_4.png')


model_name = "google/matcha-chartqa"
model = Pix2StructForConditionalGeneration.from_pretrained(model_name)
processor = Pix2StructProcessor.from_pretrained(model_name)
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model.to(device)

def filter_output(output):
    return output.replace("<0x0A>", "")

def chart_qa(image, question):
    inputs = processor(images=image, text=question, return_tensors="pt").to(device)
    predictions = model.generate(**inputs, max_new_tokens=512)
    return filter_output(processor.decode(predictions[0], skip_special_tokens=True))

   
image = gr.inputs.Image(type="pil", label="Chart")
question = gr.inputs.Textbox(label="Question")
answer = gr.outputs.Textbox(label="Model Output")
examples = [["chart_example.png", "Which country has the second highest death rate?"],
            ["chart_example_2.png", "Which year has the smallest gap between B2B and B2C sales?"],
            ["chart_example_3.png", "Which country has the highest CPA received in 2005?"],] # ["chart_example_4.png"]]

title = "Interactive demo: Chart QA with MatCha"
description = "Gradio Demo for the [matcha](https://arxiv.org/abs/2212.09662) model, fine-tuned on the [ChartQA](https://paperswithcode.com/dataset/chartqa) dataset. To use it, simply upload your image and click 'submit', or click one of the examples to load them."

interface = gr.Interface(fn=chart_qa, 
                         inputs=[image, question], 
                         outputs=answer, 
                         examples=examples, 
                         title=title,
                         description=description,
                         theme='gradio/soft',
                         enable_queue=True)

interface.launch(debug=True)