from flask import Blueprint, flash, redirect, render_template, request, url_for
from flask_login import current_user, login_required, login_user, logout_user

from flaskblog import bcrypt
from flaskblog.users.forms import (LoginForm, RegistrationForm, RequestResetForm,
                                   ResetPasswordForm, UpdateAccountForm)
from flaskblog.models import User, Post
from flaskblog.users.utils import save_picture, send_reset_email

users = Blueprint('users', __name__)


@users.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))

    form = RegistrationForm()
    if form.validate_on_submit():
        hashed_password = bcrypt.generate_password_hash(
            form.password.data).decode('utf-8')

        user = User(username=form.username.data,
                    email=form.email.data, password=hashed_password)

        user.save()

        flash('Your account has been created, please login!', 'success')
        return redirect(url_for('users.login'))
    return render_template('register.html', title='Register', form=form)


@users.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))

    form = LoginForm()
    if form.validate_on_submit():
        user = User.find_by_email(email=form.email.data)
        if user and bcrypt.check_password_hash(user.password, form.password.data):
            login_user(user, remember=form.remember.data)  # set current_user

            # Redirect user to th restricted page on login else send them home
            next_page = request.args.get('next')
            return redirect(next_page) if next_page else redirect(url_for('main.home'))
        else:
            flash('Authentication Failed', 'danger')
    return render_template('login.html', title='LogIn', form=form)


@users.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('main.home'))


@users.route("/account",  methods=['GET', 'POST'])
@login_required
def account():
    form = UpdateAccountForm()
    if form.validate_on_submit():
        if form.picture.data:
            picture_file = save_picture(form.picture.data)
            current_user.image_file = picture_file

        current_user.username = form.username.data
        current_user.email = form.email.data
        current_user.save()
        flash('Your account has been updated', 'success')
        return redirect(url_for('users.account'))
    elif request.method == 'GET':
        form.username.data = current_user.username
        form.email.data = current_user.email
    image_file = url_for(
        'static', filename=f'profile_pics/{current_user.image_file}')
    return render_template('account.html', title='Account',
                           image_file=image_file, form=form)


@users.route('/user/<string:username>')
def user_posts(username):
    page = request.args.get('page', 1, type=int)
    user = User.find_by_username(username)
    posts = Post.find_posts_by_user(user=user, page=page)
    return render_template('user_posts.html', posts=posts, user=user)


@users.route("/reset_password", methods=['GET', 'POST'])
def request_reset_password():
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))

    form = RequestResetForm()
    if form.validate_on_submit():
        user = User.find_by_email(email=form.email.data)
        send_reset_email(user)
        flash('An email with password reset instructions has been sent to you', 'info')
        return redirect(url_for('users.login'))
    return render_template('request_reset_password.html', title='Request Reset Password', form=form)


@users.route("/reset_password/<string:token>", methods=['GET', 'POST'])
def reset_password(token):
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))

    user = User.verify_reset_token(token)
    if not user:
        flash('Oops, looks like this URL is invalid, Try again!', 'warning')
        return redirect(url_for('users.request_reset_password'))

    form = ResetPasswordForm()
    if form.validate_on_submit():
        hashed_password = bcrypt.generate_password_hash(
            form.password.data).decode('utf-8')

        user.password = hashed_password
        user.save()
        flash('Your password has been updated, please login!', 'success')
        return redirect(url_for('users.login'))
    return render_template('reset_password.html', title='Reset Password', form=form)
