from flask import render_template, url_for, flash, redirect,request,Blueprint
from flask_login import login_user, current_user,logout_user,login_required
from flaskblog import db,bcrypt
from flaskblog.models import User,Post
from flaskblog.users.forms import RegistrationForm, LoginForm,UpdateAccountForm,RequestResetForm,ResetPasswordForm
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)
        db.session.add(user)
        db.session.commit()
        flash('Your account has been created! you can proceed', '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.query.filter_by(email=form.email.data).first()
        if user and bcrypt.check_password_hash(user.password,form.password.data):
                login_user(user,remember=form.remember.data)
                next_page=request.args.get('next')
                
                return redirect(next_page) if next_page else redirect(url_for('main.home'))
        else:
            flash('Login Unsuccessful. Please check email and password', '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
        db.session.commit()
        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='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.query.filter_by(username=username).first_or_404()
    posts=Post.query.filter_by(author=user)\
    .order_by(Post.date_posted.desc())\
    .paginate(per_page=5,page=page)
    return render_template('user_posts.html', posts=posts,user=user)


@users.route("/reset_password",methods=['GET', 'POST'])
def reset_request():
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))
    form=RequestResetForm()
    if form.validate_on_submit():
        user=User.query.filter_by(email=form.email.data).first()
        send_reset_email(user)
        flash('An email has been sent with instructions to reset password','info')
        return redirect(url_for('users.login'))
    return render_template('reset_request.html', title='Reset Password',form=form)

@users.route("/reset_password/<token>",methods=['GET', 'POST'])
def reset_token(token):
    if current_user.is_authenticated:
        return redirect(url_for('main.home'))
    user=User.verify_reset_token(token)
    if user is None:
        flash('That is a invalid or expired token','warning')
        return redirect(url_for('reset_request'))
    form=ResetPasswordForm()
    if form.validate_on_submit():
        hashed_password=bcrypt.generate_password_hash(form.password.data).decode('utf-8')
        user.password=hashed_password
        db.session.commit()
        flash('Your password has been updated! you are able to login.', 'success')
        return redirect(url_for('users.login'))
    return render_template('reset_token.html', title='Reset Password',form=form)