import datetime
import hashlib

from flask import Flask, render_template, redirect, url_for, request
from flask_login import login_required, LoginManager, login_user, logout_user, current_user

from models.Habit import Habit
from models.User import User
from utils import anonymous_required

# Create a new Flask instance
app = Flask(__name__)
app.secret_key = 'PSSSSSHHHT!'

# Initialize the Flask-Login extension
login_manager = LoginManager()
login_manager.login_view = 'login'
login_manager.init_app(app)


@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)


@app.context_processor
def inject_user():
    return dict(user=current_user)


# Create a new route
@app.route('/')
def index():
    # return 'Hello World'
    return render_template('index.html', title='Home', utc_dt=datetime.datetime.now().strftime("%d.%m.%Y %H:%M:%S"))


@app.route('/test')
@login_required
def secret():
    return 'Pssst!'


@app.route('/login')
@anonymous_required
def login():
    return render_template('auth/login.html', errors={})


@app.route('/signup')
@anonymous_required
def signup():
    return render_template('auth/signup.html', errors={})


@app.route('/signup', methods=['POST'])
def signup_post():
    email = request.form.get('email')
    name = request.form.get('name')
    password = request.form.get('password')

    # Check for errors
    errors = {}
    if not email:
        errors['email'] = 'Email is required.'
    if not name:
        errors['name'] = 'Name is required.'
    if not password:
        errors['password'] = 'Password is required.'

    if errors:
        return render_template(
            'auth/signup.html',
            email=email,
            name=name,
            password=password,
            errors=errors
        )

    # Save user to database. Maybe log the user in directly.
    user = User.create(name, email, password)
    login_user(user)

    # Redirect to login page
    return redirect(url_for('index'))


@app.route('/login', methods=['POST'])
def login_post():
    email = request.form.get('email')
    password = request.form.get('password')

    # Check for errors
    errors = {}
    if not email:
        errors['email'] = 'Email is required.'
    if not password:
        errors['password'] = 'Password is required.'

    # Check if user exists
    user = User.get_by_email(email)

    if not user:
        errors['email'] = 'User does not exist.'
    elif user.password is None or hashlib.sha256(password.encode()).hexdigest() != user.password:
        errors['password'] = 'Password incorrect.'

    if errors:
        return render_template(
            'auth/login.html',
            email=email,
            password=password,
            errors=errors
        )

    login_user(user)

    # Redirect to login page
    return redirect(url_for('index'))


@app.route('/logout')
@login_required
def logout():
    # Log out functionality
    logout_user()

    return redirect(url_for('index'))


# Run the application
if __name__ == '__main__':
    app.run(port=5000, debug=True)