import os, math, json

from flask import Flask, request, render_template
from functools import lru_cache

from search import init_colbert, search_colbert
from db_search import complete_request, parse_results

PORT = int(os.getenv("PORT", 8893))
app = Flask(__name__)

counter = {"api" : 0}


@lru_cache(maxsize=1000000)
def api_search_query(query, year, k=10):
    print(f"Query={query}")

    k = min(int(k), 100)

    # Use ColBERT to find passages related to the query
    pids, ranks, scores = search_colbert(query, year, k)

    # Softmax output probs
    probs = [math.exp(s) for s in scores]
    probs = [p / sum(probs) for p in probs]

    # Compile and return using the API
    topk = []
    for pid, rank, score, prob in zip(pids, ranks, scores, probs):
        topk += [{
            'pid': pid, 
            'rank': rank, 
            'score': score, 
            'prob': prob,
        }]
    
    topk = list(sorted(topk, key=lambda p: (-1 * p['score'], p['pid'])))
    return {"query" : query, "topk": topk}


@app.route("/api/search", methods=["GET"])
def api_search():
    if request.method == "GET":
        counter["api"] += 1
        print("API request count:", counter["api"])
        return api_search_query(request.args.get("query"), request.args.get("year"), request.args.get("k"))
    
    return ('', 405)
    

@app.route('/', methods=['POST', 'GET'])
def index():
    return render_template('index.html')


@app.route('/query', methods=['POST', 'GET'])
def query():
    if request.method == "POST":
        query, year = request.form['query'], int(request.form['year'])

    K = 100

    # Get top passage IDs from ColBERT
    colbert_response = api_search_query(query, year, K)

    results = complete_request(colbert_response, year)

    if results:
        return render_template('results.html', query=query, year=year, results=results)
    
    return render_template('no_results.html', query=query, year=year)


if __name__ == "__main__":
    """
    Example usage:
    python server.py
    http://localhost:8893/api/search?k=25&query=How to extend context windows?
    """
    init_colbert()
    app.run("0.0.0.0", PORT)