import gradio as gr
from PIL import Image
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
import cv2
import numpy as np
import io


# # Ensure GPU usage if available
device = "cuda" if torch.cuda.is_available() else "cpu"



# Initialize the model and tokenizer
model = AutoModelForCausalLM.from_pretrained("ManishThota/SparrowVQE",
                                             torch_dtype=torch.float16, 
                                             device_map="auto",
                                             trust_remote_code=True)
tokenizer = AutoTokenizer.from_pretrained("ManishThota/SparrowVQE", trust_remote_code=True)


# def process_video(video_bytes):
#     """Extracts frames from the video, 1 per second."""
#     video = cv2.VideoCapture(io.BytesIO(video_bytes))
#     fps = video.get(cv2.CAP_PROP_FPS)
#     frames = []
#     success, frame = video.read()
#     while success:
#         frames.append(frame)
#         for _ in range(int(fps)):  # Skip fps frames
#             success, frame = video.read()
#     video.release()
#     return frames[:4]  # Return the first 4 frames

def video_to_frames(video_path):
    """Converts a video file into frames and stores them as PNG images in a list."""
    # List to hold frames encoded as PNG
    frames_png = []
    
    # Open the video file
    cap = cv2.VideoCapture(video_path)
    
    # Check if video opened successfully
    if not cap.isOpened():
        print("Error opening video file")
        return frames_png
    
    # Read until video is completed
    while cap.isOpened():
        # Capture frame-by-frame
        ret, frame = cap.read()
        
        # If frame is read correctly ret is True
        if not ret:
            print("Can't receive frame (stream end?). Exiting ...")
            break
        
        # Convert the frame to PNG and store it
        is_success, buffer = cv2.imencode(".png", frame)
        if is_success:
            frames_png.append(np.array(buffer).tobytes())
    
    # When everything done, release the video capture object
    cap.release()
    
    return frames_png

def predict_answer(image, video, question, max_tokens=100):
    
    if image:
        # Process as an image
        image = image.convert("RGB")
        input_ids = tokenizer(question, return_tensors='pt').input_ids.to(device)
        image_tensor = model.image_preprocess(image)
        
        #Generate the answer
        output_ids = model.generate(
            input_ids,
            max_new_tokens=max_tokens,
            images=image_tensor,
            use_cache=True)[0]
        
        return tokenizer.decode(output_ids[input_ids.shape[1]:], skip_special_tokens=True).strip()
        
    elif video:
        # Process as a video
        frames = video_to_frames(video)
        answers = []
        for frame in frames:
            frame = Image.open(frame).convert("RGB")
            input_ids = tokenizer(question, return_tensors='pt').input_ids.to(device)
            image_tensor = model.image_preprocess(frame)
            
            # Generate the answer
            output_ids = model.generate(
                input_ids,
                max_new_tokens=max_tokens,
                images=image_tensor,
                use_cache=True)[0]
            
            answer = tokenizer.decode(output_ids[input_ids.shape[1]:], skip_special_tokens=True).strip()
            answers.append(answer)
        return "\n".join(answers)
        
    else:
        return "Unsupported file type. Please upload an image or video."
        



def gradio_predict(image, video, question, max_tokens):
    answer = predict_answer(image, video, question, max_tokens)
    return answer
    


# Define the Gradio interface
iface = gr.Interface(
    fn=gradio_predict,
    inputs=[gr.Image(type="pil", label="Upload or Drag an Image"), 
            gr.Video(label="upload your video here"),
            gr.Textbox(label="Question", placeholder="e.g. Can you explain the slide?", scale=4),
            gr.Slider(2, 500, value=25, label="Token Count", info="Choose between 2 and 500")],
    outputs=gr.TextArea(label="Answer"),
    # examples=examples,
    title="Super Rapid Annotator - Multimodal vision tool to annotate videos with LLaVA framework",
    # description="An interactive chat model that can answer questions about images in an Academic context. \n We can input images, and the system will analyze them to provide information about their contents. I've utilized this capability by feeding slides from PowerPoint presentations used in classes and the lecture content passed as text. Consequently, the model now mimics the behavior and responses of my professors. So, if I present any PowerPoint slide, it explains it just like my professor would, further it can be personalized.",
)

# Launch the app
iface.queue().launch(debug=True)