import os
from typing import Union

from flask import (Flask, flash, redirect, render_template, request,
                   send_from_directory, url_for)
from flask_login import LoginManager, login_required, login_user, logout_user

from forms import LoginForm
from latosa import LaToSa
from user import User

app = Flask(__name__)
app.config.update(
    SECRET_KEY=os.urandom(32),
    SESSION_COOKIE_HTTPONLY=True,
    REMEMBER_COOKIE_HTTPONLY=True,
    SESSION_COOKIE_SAMESITE="Strict",
)
login_manager = LoginManager()
login_manager.init_app(app)

latosa = LaToSa(app)


@login_manager.user_loader
def load_user(user_id) -> Union[User, None]:
    for user in latosa.get_users():
        if user.uid == user_id:
            return user
    return None


@app.route('/', methods=['GET', 'POST'])
def index():
    i18n = latosa.get_i18n(request)
    form = LoginForm()
    if request.method == 'POST':
        username = form.username.data
        password = form.password.data
        user = latosa.login_user(username, password)
        if user:
            login_user(user)
            flash(i18n['login']['success'])
            return redirect(url_for('admin'))
        flash(i18n['login']['failed'])
    return render_template('index.html', i18n=i18n, form=form)


@app.route('/admin', methods=['GET'])
@login_required
def admin():
    i18n = latosa.get_i18n(request)
    return render_template('admin.html', i18n=i18n)


@app.route('/favicon.ico')
def favicon():
    return send_from_directory(os.path.join(app.root_path, 'static'),
                               'favicon.ico',
                               mimetype='image/vnd.microsoft.icon')