from flask import Blueprint, render_template, request, redirect, url_for, flash, make_response, current_app
from flask_login import login_user, logout_user, login_required, current_user
from models import db
from models import User
from log import Log
from itsdangerous import BadSignature, SignatureExpired, URLSafeTimedSerializer


auth_bp = Blueprint("auth", __name__)

AUTOLOGIN_MAX_AGE_SECONDS = 7 * 24 * 60 * 60
AUTOLOGIN_SALT = "lapp-autologin"

def autologin_serializer():
    return URLSafeTimedSerializer(current_app.config["SECRET_KEY"], salt=AUTOLOGIN_SALT)

def create_cookie(userid):
    cookie_data = {
        "user": userid
    }
    return autologin_serializer().dumps(cookie_data)

def is_cookie_ok_to_autologin(cookie_content):
    if not cookie_content:
        return 0

    try:
        cookie_data = autologin_serializer().loads(cookie_content,
                                                   max_age=AUTOLOGIN_MAX_AGE_SECONDS)
        return int(cookie_data["user"])
    except (BadSignature, SignatureExpired, KeyError, TypeError, ValueError):
        Log.info("Cookie error")
    return 0

#. @auth_bp.route("/", methods=["GET", "POST"])
@auth_bp.route("/login", methods=["GET", "POST"])
def login():
    username = request.cookies.get('username')

    userid = is_cookie_ok_to_autologin(username)
    if userid>0:
        user = User.query.filter_by(id=userid).first()
        if user and user.is_approved and user.group_id>0:
            login_user(user)
            return redirect(url_for("lists.home"))
    
    if request.method == "POST":
        user = User.query.filter_by(name=request.form["name"]).first()
        if user and user.check_password(request.form["password"]):
            if not user.is_approved:
                return render_template("pending.html")
            if user.group_id>0:
                login_user(user)
                return redirect(url_for("lists.home"))
        # flash("Invalid key credentials.")
        Log.info(f"Authorization failure for user '{request.form["name"]}' ")

    
    login_failed = request.method == "POST"
    resp = make_response(render_template(
        "login.html",
        name_placeholder="Sorry" if login_failed else "Name",
        password_placeholder="Try again" if login_failed else "Password",
    ))
    resp.set_cookie('username', '')
    return resp
    

@auth_bp.route("/register", methods=["GET", "POST"])
def register():
    if request.method == "POST":
        name = request.form["name"].strip()
        group = request.form["group"]
        password = request.form["password"]

        existing_user = User.query.filter_by(name=name).first()
        if existing_user:
            return render_template("register.html", error="That name is already registered.")

        user = User(name=name)
        group_id = user.set_group_id(group)
        if group_id == 0:
            return render_template("register.html", error="Unknown registration key.")

        user.set_password(password)
        user.group_id = group_id
        db.session.add(user)
        db.session.commit()
        return render_template("pending.html")
    return render_template("register.html")

@auth_bp.route("/logout")
@login_required
def logout():
    logout_user()
    resp = make_response(redirect(url_for("auth.login")))
    resp.set_cookie('username', '')
    return resp


@auth_bp.route("/change_pwd", methods=["GET", "POST"])
@login_required
def change_pwd():
    if request.method == "POST":
        pwd_old = request.form["password_old"]
        pwd_new1 = request.form["password_new1"]
        pwd_new2 = request.form["password_new2"]
        if not current_user.check_password(pwd_old):
            flash("Invalid old credentials")
            Log.info(f"Authorization failure for user '{current_user.name}' ")
        elif pwd_new1 != pwd_new2:
            flash("New Passwords are not identical")
        else:
            current_user.set_password(pwd_new2)
            db.session.commit()
            return redirect(url_for("lists.home"))

        return redirect(url_for("auth.change_pwd"))

    return render_template("change_pwd.html")