import functools

from flask import flash
from flask import g
from flask import redirect
from flask import render_template
from flask import request
from flask import session
from flask import url_for
from werkzeug.security import check_password_hash
from werkzeug.security import generate_password_hash

from app import webapp
from app.models.settings import Setting

def login_required(view):
    """View decorator that redirects anonymous users to the login page."""

    @functools.wraps(view)
    def wrapped_view(**kwargs):
        login_required = Setting.get_value(Setting.Keys.HASSCALL_LOGIN_REQUIRED)
        if login_required == 'true':
            if g.user is None:
                flash("You need to be logged in to access that page!", "warning")
                return redirect(url_for("login"))

        return view(**kwargs)

    return wrapped_view


@webapp.before_request
def load_logged_in_user():
    """If a user id is stored in the session, load the user object from
    the database into ``g.user``."""
    user_id = session.get("user_id")

    if user_id is None:
        g.user = None
    else:
        g.user = (
            Setting.get_value(Setting.Keys.HASSCALL_USERNAME)
        )

@webapp.route("/login", methods=("GET", "POST"))
def login():
    """Log in a registered user by adding the user id to the session."""
    if request.method == "GET":
        auth_enabled = Setting.get_value(Setting.Keys.HASSCALL_LOGIN_REQUIRED)
        if not auth_enabled == 'true':
            flash("Authorization is not enabled.", "error")
            return redirect(url_for('index'))

    elif request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]
        
        setting_user = Setting.get_value(Setting.Keys.HASSCALL_USERNAME)
        setting_password = Setting.get_value(Setting.Keys.HASSCALL_PASSWORD)

        if username != setting_user or not check_password_hash(setting_password, password):
            flash("Incorrect username or password!", "error")
        else:
            session.clear()
            session["user_id"] = setting_user
            flash("Successfully logged in!", 'success')
            return redirect(url_for("callbacks"))

    return render_template("auth/login.html")


@webapp.route("/logout")
def logout():
    """Clear the current session, including the stored user id."""
    session.clear()
    flash("Logged out", "success")
    return redirect(url_for("index"))