from flask import Flask, render_template, request, jsonify
from rank_bm25 import BM25Okapi
import numpy as np

app = Flask(__name__)

corpus = [
    "Hello there good man!",
    "It is quite windy in London",
    "How is the weather today?"
    
]

tokenized_corpus = [doc.split(" ") for doc in corpus]

bm25 = BM25Okapi(tokenized_corpus)

@app.route('/')
def home():
    return render_template('index.html')

@app.route('/search', methods=['POST'])
def search():
    query = request.form['query']

    if not query:
        return render_template('index.html', error='Query is required')

    tokenized_query = query.split(" ")
    doc_scores = bm25.get_scores(tokenized_query)
    doc_scores = -np.sort(-np.array(doc_scores))
    doc_scores=doc_scores[:20]
    top_n_docs = bm25.get_top_n(tokenized_query, corpus, n=3)

    return render_template('index.html', query=query, doc_scores=doc_scores, top_n_docs=top_n_docs)

if __name__ == '__main__':
    app.run(debug=True)