import gradio as gr
import spaces
from transformers import Qwen2VLForConditionalGeneration, AutoProcessor, TextIteratorStreamer
from qwen_vl_utils import process_vision_info
import torch
from PIL import Image
import subprocess
import numpy as np
import os
from threading import Thread

# Model and Processor Loading (Done once at startup)
MODEL_ID = "Qwen/Qwen2-VL-7B-Instruct"
model = Qwen2VLForConditionalGeneration.from_pretrained(
    MODEL_ID,
    trust_remote_code=True,
    torch_dtype=torch.float16
).to("cuda").eval()
processor = AutoProcessor.from_pretrained(MODEL_ID, trust_remote_code=True)

DESCRIPTION = "[Qwen2-VL-7B Demo](https://huggingface.co/Qwen/Qwen2-VL-7B-Instruct)"

image_extensions = Image.registered_extensions()
video_extensions = ("avi", "mp4", "mov", "mkv", "flv", "wmv", "mjpeg", "wav", "gif", "webm", "m4v", "3gp")


@spaces.GPU
def qwen_inference(media_path, text_input=None):
    if media_path.endswith(tuple([i for i, f in image_extensions.items()])):
        media_type = "image"
    elif media_path.endswith(video_extensions):  # Check if it's a video path
        media_type = "video"
    else:
        raise ValueError(
            "Unsupported media type. Please upload an image or video."
        )

    messages = [
        {
            "role": "user",
            "content": [
                {
                    "type": media_type,
                    media_type: media_path,
                    **({"fps": 8.0} if media_type == "video" else {}),
                },
                {"type": "text", "text": text_input},
            ],
        }
    ]

    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",
    ).to("cuda")

    streamer = TextIteratorStreamer(
        processor, skip_prompt=True, **{"skip_special_tokens": True}
    )
    generation_kwargs = dict(inputs, streamer=streamer, max_new_tokens=1024)

    thread = Thread(target=model.generate, kwargs=generation_kwargs)
    thread.start()

    buffer = ""
    for new_text in streamer:
        buffer += new_text
        yield buffer


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

with gr.Blocks(css=css) as demo:
    gr.Markdown(DESCRIPTION)

    with gr.Tab(label="Image/Video Input"):
        with gr.Row():
            with gr.Column():
                input_media = gr.File(
                    label="Upload Image or Video", type="filepath"
                )
                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(
            qwen_inference, [input_media, text_input], [output_text]
        )

demo.launch(debug=True)