import mysql.connector.pooling
from flask import jsonify, request, current_app, Response
from ktvmanager.lib.checker import single_account_check
from ktvmanager.lib.encryption import encrypt_password, decrypt_password
from ktvmanager.lib.get_urls import get_latest_urls_from_dns
from typing import List, Dict, Any, Optional, Tuple

db_pool = None


def initialize_db_pool() -> None:
    """Initializes the database connection pool."""
    global db_pool
    db_pool = mysql.connector.pooling.MySQLConnectionPool(
        pool_name="ktv_pool",
        pool_size=5,
        host=current_app.config["DBHOST"],
        user=current_app.config["DBUSER"],
        password=current_app.config["DBPASS"],
        database=current_app.config["DATABASE"],
        port=current_app.config["DBPORT"],
    )
    _create_push_subscriptions_table()


def _create_push_subscriptions_table() -> None:
    """Creates the push_subscriptions table if it doesn't exist."""
    query = """
    CREATE TABLE IF NOT EXISTS push_subscriptions (
        id INT AUTO_INCREMENT PRIMARY KEY,
        user_id INT NOT NULL,
        subscription_json TEXT NOT NULL,
        last_notified TIMESTAMP NULL,
        FOREIGN KEY (user_id) REFERENCES users(id)
    )
    """
    _execute_query(query)


def _execute_query(query: str, params: Optional[tuple] = None) -> List[Dict[str, Any]] | Dict[str, int]:
    """Executes a SQL query and returns the result.

    Args:
        query: The SQL query to execute.
        params: The parameters to pass to the query.

    Returns:
        A list of dictionaries for SELECT queries, or a dictionary with the
        number of affected rows for other queries.
    """
    conn = db_pool.get_connection()
    cursor = conn.cursor(dictionary=True)
    try:
        cursor.execute(query, params)
        if query.strip().upper().startswith("SELECT"):
            result = cursor.fetchall()
        else:
            conn.commit()
            result = {"affected_rows": cursor.rowcount}
        return result
    finally:
        cursor.close()
        conn.close()


def get_user_id_from_username(username: str) -> Optional[int]:
    """Retrieves the user ID for a given username.

    Args:
        username: The username to look up.

    Returns:
        The user ID if found, otherwise None.
    """
    query = "SELECT id FROM users WHERE username = %s"
    result = _execute_query(query, (username,))
    if result:
        return result[0]["id"]
    return None


def get_user_accounts(user_id: int) -> Response:
    """Retrieves all accounts for a given user ID.

    Args:
        user_id: The ID of the user.

    Returns:
        A Flask JSON response containing the user's accounts.
    """
    query = "SELECT * FROM userAccounts WHERE userID = %s"
    accounts = _execute_query(query, (user_id,))
    for account in accounts:
        try:
            account["password"] = decrypt_password(account["password"])
        except Exception as e:
            # Log the error to the console for debugging
            print(
                f"Password decryption failed for account ID {account.get('id', 'N/A')}: {e}"
            )
            account["password"] = "DECRYPTION_FAILED"
    return jsonify(accounts)


def get_stream_names() -> Response:
    """Retrieves all stream names from the database.

    Returns:
        A Flask JSON response containing a list of stream names.
    """
    query = "SELECT streamName FROM streams"
    results = _execute_query(query)
    stream_names = [row["streamName"] for row in results]
    return jsonify(stream_names)


def single_check() -> Response | Tuple[Response, int]:
    """
    Performs a check on a single account provided in the request JSON.

    Returns:
        A Flask JSON response with the result of the check, or an error message.
    """
    data = request.get_json()
    stream_urls = current_app.config["STREAM_URLS"]
    result = single_account_check(data, stream_urls)
    if result:
        # Here you would typically update the database with the new information
        return jsonify(result)
    return jsonify({"message": "All checks failed"}), 400


def add_account(user_id: int) -> Response:
    """Adds a new account for a user.

    Args:
        user_id: The ID of the user.

    Returns:
        A Flask JSON response confirming the account was added.
    """
    data = request.form
    res = single_account_check(data, get_latest_urls_from_dns())
    encrypted_password = encrypt_password(data["password"])
    query = "INSERT INTO userAccounts (username, stream, streamURL, expiaryDate, password, userID, maxConnections) VALUES (%s, %s, %s, %s, %s, %s, %s)"
    params = (
        data["username"],
        data["stream"],
        res["url"],
        res["data"]["user_info"]["exp_date"],
        encrypted_password,
        user_id,
        res["data"]["user_info"]["max_connections"],
    )
    result = _execute_query(query, params)
    return jsonify(result)


def update_expiry_date(username: str, stream: str, expiry_date: str) -> None:
    """Updates the expiry date of an account.

    Args:
        username: The username of the account.
        stream: The stream of the account.
        expiry_date: The new expiry date.
    """
    query = "UPDATE userAccounts SET expiaryDate = %s WHERE username = %s AND stream = %s"
    params = (expiry_date, username, stream)
    _execute_query(query, params)


def update_max_connections(username: str, stream: str, max_connections: int) -> None:
    """Updates the max connections of an account.

    Args:
        username: The username of the account.
        stream: The stream of the account.
        max_connections: The new max connections value.
    """
    query = "UPDATE userAccounts SET maxConnections = %s WHERE username = %s AND stream = %s"
    params = (max_connections, username, stream)
    _execute_query(query, params)


def update_stream_url(new_stream: str, old_stream: str) -> None:
    """Updates the stream URL of an account.

    Args:
        new_stream: The stream of the account.
        old_stream: The new stream URL.
    """
    query = "UPDATE userAccounts SET streamURL = %s WHERE streamURL = %s"
    params = (new_stream, old_stream)
    _execute_query(query, params)


def delete_account(user_id: int) -> Response:
    """Deletes an account for a user.

    Args:
        user_id: The ID of the user.

    Returns:
        A Flask JSON response confirming the account was deleted.
    """
    data = request.form
    query = "DELETE FROM userAccounts WHERE username = %s AND stream = %s AND userId = %s"
    params = (data["user"], data["stream"], user_id)
    result = _execute_query(query, params)
    return jsonify(result)


def save_push_subscription(user_id: int, subscription_json: str) -> None:
    """Saves a push subscription to the database.

    Args:
        user_id: The ID of the user.
        subscription_json: The push subscription information as a JSON string.
    """
    query = "INSERT INTO push_subscriptions (user_id, subscription_json) VALUES (%s, %s)"
    params = (user_id, subscription_json)
    _execute_query(query, params)


def get_push_subscriptions(user_id: Optional[int] = None) -> List[Dict[str, Any]]:
    """Retrieves all push subscriptions for a given user ID, or all if no user_id is provided.

    Args:
        user_id: The ID of the user (optional).

    Returns:
        A list of push subscriptions.
    """
    if user_id:
        query = "SELECT * FROM push_subscriptions WHERE user_id = %s"
        return _execute_query(query, (user_id,))
    else:
        query = "SELECT * FROM push_subscriptions"
        return _execute_query(query)