import gradio as gr
import torch
import pickle
import numpy as np
import pandas as pd
from transformers import CLIPProcessor, CLIPModel
from transformers import VisionTextDualEncoderModel, VisionTextDualEncoderProcessor
from sklearn.metrics.pairwise import cosine_similarity
import csv
from PIL import Image

model_path_rclip = "kaveh/rclip"
embeddings_file_rclip = './image_embeddings_rclip.pkl' 

model_path_pubmedclip = "flaviagiammarino/pubmed-clip-vit-base-patch32"
embeddings_file_pubmedclip = './image_embeddings_pubmedclip.pkl' 

csv_path = "./captions.txt"

def load_image_ids(csv_file):
    ids = []
    captions = []
    with open(csv_file, 'r') as f:
        reader = csv.reader(f, delimiter='\t')
        for row in reader:
            ids.append(row[0])
            captions.append(row[1])
    return ids, captions

def load_embeddings(embeddings_file):
    with open(embeddings_file, 'rb') as f:
        image_embeddings = pickle.load(f)
    return image_embeddings


def find_similar_images(query_embedding, image_embeddings, k=2):
    similarities = cosine_similarity(query_embedding.reshape(1, -1), image_embeddings)
    closest_indices = np.argsort(similarities[0])[::-1][:k]
    scores = sorted(similarities[0])[::-1][:k]
    return closest_indices, scores


def main(query, model_id="RCLIP", k=2):
    if model_id=="RCLIP":
        # Load RCLIP model
        model = VisionTextDualEncoderModel.from_pretrained(model_path_rclip)
        processor = VisionTextDualEncoderProcessor.from_pretrained(model_path_rclip)
        # Load image embeddings 
        image_embeddings = load_embeddings(embeddings_file_rclip)
    elif model_id=="PubMedCLIP":
        model = CLIPModel.from_pretrained(model_path_pubmedclip)
        processor = CLIPProcessor.from_pretrained(model_path_pubmedclip)
        # Load image embeddings 
        image_embeddings = load_embeddings(embeddings_file_pubmedclip)   

    # Embed the query
    inputs = processor(text=query, images=None, return_tensors="pt", padding=True)
    with torch.no_grad():
        query_embedding = model.get_text_features(**inputs)[0].numpy()
    
    # Get image names
    ids, captions = load_image_ids(csv_path)
    
    # Find similar images
    similar_image_indices, scores = find_similar_images(query_embedding, image_embeddings, k=int(k))

    # Return the results
    similar_image_names = [f"./images/{ids[index]}.jpg" for index in similar_image_indices]
    similar_image_captions = [captions[index] for index in similar_image_indices]
    similar_images = [Image.open(i) for i in similar_image_names]

    return similar_images, pd.DataFrame([[t+1 for t in range(k)], similar_image_names, similar_image_captions, scores], index=["#", "path", "caption", "score"]).T


# Define the Gradio interface
examples = [
            ["Chest X-ray photos", "RCLIP", 5],
            ["Chest X-ray photos", "PubMedCLIP", 5],
            ["Orthopantogram (OPG)", "RCLIP",5],
            ["Brain MRI", "RCLIP",5], 
            ["Ultrasound", "RCLIP",5],
]

title="RCLIP Image Retrieval"
description = "CLIP model fine-tuned on the ROCO dataset"

with gr.Blocks(title=title) as demo:
    with gr.Row():
        with gr.Column(scale=5):
            gr.Markdown("# "+title)
            gr.Markdown(description)
        
        #Image.open("./data/teesside university logo.png"), height=70, show_label=False, container=False)
    with gr.Row(variant="compact"):
         query = gr.Textbox(value="Chest X-Ray Photos", label="Enter your query", show_label=False, placeholder= "Enter your query" , scale=5)
         btn = gr.Button("Search query", variant="primary", scale=1)
         
    with gr.Row(variant="compact"):   
        model_id = gr.Dropdown(["RCLIP", "PubMedCLIP"], value="RCLIP", label="Model", type="value", scale=1)
        n_s = gr.Slider(2, 10, label='Number of Top Results', value=5, step=1.0, show_label=True, scale=1)
        

    with gr.Column(variant="compact"):
        gr.Markdown("## Results")
        gallery = gr.Gallery(label="found images", show_label=True, elem_id="gallery", columns=[2], rows=[4], object_fit="contain", height="400px", preview=True)
        gr.Markdown("Information of the found images")
        df = gr.DataFrame()
    btn.click(main, [query, model_id, n_s], [gallery, df])
    
    with gr.Column(variant="compact"):
        gr.Markdown("## Examples")
        gr.Examples(examples, [query, model_id, n_s])
    
    
demo.launch(debug='True')