"""
This is a music recommendation system for maimai2 using implicit ALS.
"""
import json
from io import StringIO
from pathlib import Path

import pandas as pd
import requests
import scipy.sparse as sp
import implicit
from hypy_utils.logging_utils import setup_logger

BASE_URL = "https://aquadx.net/aqua/api/v2/game"
GAME = "mai2"
BOT_SECRET = "hunter2"

log = setup_logger()


if __name__ == '__main__':
    # Load the CSV data
    log.info("Loading data...")
    # data = pd.read_csv("data.csv")
    resp = requests.get(f"{BASE_URL}/{GAME}/recommender-fetch", params={"botSecret": BOT_SECRET})
    assert resp.status_code == 200, f"Failed to fetch data: {resp.status_code} {resp.text}"
    data = pd.read_csv(StringIO(resp.text))

    # Create a user-item matrix
    log.info("Creating user-item matrix...")
    user_item_matrix = sp.csr_matrix((
        data['count'],
        (data['user_id'], data['music_id'])
    ))

    # Train an ALS model
    log.info("Training ALS model...")
    model = implicit.als.AlternatingLeastSquares(factors=50, regularization=0.01, iterations=15)
    model.fit(user_item_matrix)

    # Generate recommendations for each user
    log.info("Generating recommendations...")
    recommendations = {}
    for user_id in range(user_item_matrix.shape[0]):  # Loop over all users
        rec, prob = model.recommend(user_id, user_item_matrix[user_id], N=20)
        recommendations[user_id] = [int(item) for item in rec]

    # Save recommendations to a file
    log.info("Saving recommendations...")
    # Path("recommendations.json").write_text(json.dumps(recommendations))
    resp = requests.post(f"{BASE_URL}/{GAME}/recommender-update", params={"botSecret": BOT_SECRET}, json=recommendations)