import gradio as gr
import spaces
from transformers import Qwen2VLForConditionalGeneration, Qwen2VLProcessor
from qwen_vl_utils import process_vision_info
import torch
from PIL import Image
from datetime import datetime
import numpy as np
import os


DESCRIPTION = """
# Qwen2-VL-7B-trl-sft-ChartQA Demo

This is a demo Space for a fine-tuned version of [Qwen2-VL-7B](https://huggingface.co/Qwen/Qwen2-VL-7B-Instruct) trained using [ChatQA dataset](https://huggingface.co/datasets/HuggingFaceM4/ChartQA).

The corresponding model is located [here](https://huggingface.co/sergiopaniego/qwen2-7b-instruct-trl-sft-ChartQA).
"""

model_id = "Qwen/Qwen2-VL-7B-Instruct" 
model = Qwen2VLForConditionalGeneration.from_pretrained(
    model_id,
    device_map="auto",
    torch_dtype=torch.bfloat16,
)
adapter_path = "sergiopaniego/qwen2-7b-instruct-trl-sft-ChartQA"
model.load_adapter(adapter_path)
processor = Qwen2VLProcessor.from_pretrained(model_id)

def array_to_image_path(image_array):
    if image_array is None:
        raise ValueError("No image provided. Please upload an image before submitting.")
    # Convert numpy array to PIL Image
    img = Image.fromarray(np.uint8(image_array))
    
    # Generate a unique filename using timestamp
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"image_{timestamp}.png"
    
    # Save the image
    img.save(filename)
    
    # Get the full path of the saved image
    full_path = os.path.abspath(filename)
    
    return full_path


@spaces.GPU
def run_example(image, text_input=None):
    image_path = array_to_image_path(image)
    image = Image.fromarray(image).convert("RGB")
    messages = [
    {
            "role": "user",
            "content": [
                {
                    "type": "image",
                    "image": image_path,
                },
                {
                    "type": "text", 
                    "text": text_input
                },
            ],
        }
    ]
    
    # Preparation for inference
    text = processor.apply_chat_template(
        messages, tokenize=False, add_generation_prompt=True
    )
    image_inputs, video_inputs = process_vision_info(messages)
    inputs = processor(
        text=[text],
        images=image_inputs,
        videos=video_inputs,
        padding=True,
        return_tensors="pt",
    )
    inputs = inputs.to("cuda")
    
    # Inference: Generation of the output
    generated_ids = model.generate(**inputs, max_new_tokens=1024)
    generated_ids_trimmed = [
        out_ids[len(in_ids) :] for in_ids, out_ids in zip(inputs.input_ids, generated_ids)
    ]
    output_text = processor.batch_decode(
        generated_ids_trimmed, skip_special_tokens=True, clean_up_tokenization_spaces=False
    )
    
    return output_text[0]

css = """
  #output {
    height: 500px; 
    overflow: auto; 
    border: 1px solid #ccc; 
  }
"""

with gr.Blocks(css=css) as demo:
    gr.Markdown(DESCRIPTION)
    with gr.Tab(label="Qwen2-VL-7B-trl-sft-ChartQA Input"):
        with gr.Row():
            with gr.Column():
                input_img = gr.Image(label="Input Picture")
                text_input = gr.Textbox(label="Question")
                submit_btn = gr.Button(value="Submit")
            with gr.Column():
                output_text = gr.Textbox(label="Output Text")

        submit_btn.click(run_example, [input_img, text_input], [output_text])

demo.queue(api_open=False)
demo.launch(debug=True)