from flask_login import login_user, logout_user
from flask import Blueprint, render_template, redirect, url_for, request, flash
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import login_required, current_user, login_manager
from .models import User
from . import db

auth = Blueprint('auth', __name__)


@auth.route('/login')
def login():
    return render_template('login.html')


@auth.route('/login', methods=['POST'])
def login_post():
    # login code goes here
    email = request.form.get('email')
    password = request.form.get('password')
    remember = True if request.form.get('remember') else False

    user = User.query.filter_by(email=email).first()

    # check if the user actually exists
    # take the user-supplied password, hash it, and compare it to the hashed password in the database
    if not user or not check_password_hash(user.password, password):
        flash('请检查登录信息')
        # if the user doesn't exist or password is wrong, reload the page
        return redirect(url_for('auth.login'))

    # if the above check passes, then we know the user has the right credentials
    login_user(user, remember=remember)
    return redirect(url_for('main.profile'))


@auth.route('/signup')
def signup():
    return render_template('signup.html')


@auth.route('/signup', methods=['POST'])
def signup_post():
    # code to validate and add user to database goes here
    email = request.form.get('email')
    name = request.form.get('name')
    password = request.form.get('password')
    # if this returns a user, then the email already exists in database
    user = User.query.filter_by(email=email).first()

    if user:  # if a user is found, we want to redirect back to signup page so user can try again
        flash('此邮箱已注册！')
        return redirect(url_for('auth.signup'))
    if not (email):
        flash('Email missing!')
        return redirect(url_for('auth.signup'))
    if not (name):
        name = email
    if not (password):
        flash('Password missing!')
        return redirect(url_for('auth.signup'))
    # create a new user with the form data. Hash the password so the plaintext version isn't saved.
    new_user = User(email=email,
                    name=name,
                    password=generate_password_hash(password, method='sha256'),
                    role='user',
                    isActivated=False)

    # first user is always admin
    if not db.session.query(User).count():
        new_user.role='admin'
        new_user.isActivated=True
    # add the new user to the database
    db.session.add(new_user)
    db.session.commit()
    return redirect(url_for('auth.login'))


@auth.route('/logout')
def logout():
    if current_user.is_authenticated:
        logout_user()
    return redirect(url_for('main.index'))