from sentence_transformers import SentenceTransformer, util
from PIL import Image
import glob
import torch
import pickle
import zipfile
import os
from tqdm.autonotebook import tqdm
import gradio as gr


# Here we load the multilingual CLIP model. Note, this model can only encode text.
# If you need embeddings for images, you must load the 'clip-ViT-B-32' model
model = SentenceTransformer('clip-ViT-B-32-multilingual-v1')


# Next, we get about 25k images from Unsplash 
img_folder = 'photos/'
if not os.path.exists(img_folder) or len(os.listdir(img_folder)) == 0:
    os.makedirs(img_folder, exist_ok=True)
    
    photo_filename = 'unsplash-25k-photos.zip'
    if not os.path.exists(photo_filename):   #Download dataset if does not exist
        util.http_get('http://sbert.net/datasets/'+photo_filename, photo_filename)
        
    #Extract all images
    with zipfile.ZipFile(photo_filename, 'r') as zf:
        for member in tqdm(zf.infolist(), desc='Extracting'):
            zf.extract(member, img_folder)
      
 # Now, we need to compute the embeddings
# To speed things up, we destribute pre-computed embeddings
# Otherwise you can also encode the images yourself.
# To encode an image, you can use the following code:
# from PIL import Image
# img_emb = model.encode(Image.open(filepath))

use_precomputed_embeddings = True

if use_precomputed_embeddings: 
    emb_filename = 'unsplash-25k-photos-embeddings.pkl'
    if not os.path.exists(emb_filename):   #Download dataset if does not exist
        util.http_get('http://sbert.net/datasets/'+emb_filename, emb_filename)
        
    with open(emb_filename, 'rb') as fIn:
        img_names, img_emb = pickle.load(fIn)  
    print("Images:", len(img_names))
else:
    #For embedding images, we need the non-multilingual CLIP model
    img_model = SentenceTransformer('clip-ViT-B-32')

    img_names = list(glob.glob('photos/*.jpg'))
    print("Images:", len(img_names))
    img_emb = img_model.encode([Image.open(filepath) for filepath in img_names], batch_size=128, convert_to_tensor=True, show_progress_bar=True)

filepath = 'photos/'+img_names[0]
one_emb = torch.tensor(img_emb[0])
img_model = SentenceTransformer('clip-ViT-B-32')
comb_emb = img_model.encode(Image.open(filepath), convert_to_tensor=True).cpu()

# Next, we define a search function.
def search(query):
    # First, we encode the query (which can either be an image or a text string)
    query_emb = model.encode([query], convert_to_tensor=True, show_progress_bar=False)
    
    # Then, we use the util.semantic_search function, which computes the cosine-similarity
    # between the query embedding and all image embeddings.
    # It then returns the top_k highest ranked images, which we output
    hits = util.semantic_search(query_emb, img_emb, top_k=1)[0]
    
    for hit in hits:
        return os.path.join(img_folder, img_names[hit['corpus_id']])

title = "Image Search"
description = "demo for multilingual text2image search for 50+ languages. To use it, simply add your text, or click one of the examples to load them. Read more at the links below."
article = "<p style='text-align: center'><a href='https://www.sbert.net/'>SentenceTransformers Documentation</a> | <a href='https://github.com/UKPLab/sentence-transformers/tree/master/examples/applications/image-search'>Github Repo</a></p>"

gr.Interface(
    search, 
    gr.inputs.Textbox(label="Input"), 
    gr.outputs.Image(type="file", label="Output"),
    title=title,
    description=description,
    article=article,
    examples=[
        ['Two dogs playing in the snow'],
        ['Eine Katze auf einem Stuhl'],
        ['Muchos peces'],
        ['棕榈树的沙滩'],
        ['Закат на пляже'],
        ['Parkta bir köpek'],
        ['夜のニューヨーク']
    ]
    ).launch()