from flask import render_template, url_for,flash,redirect,request,abort
from blog.forms import RegistrationForm, LoginForm, PostForm
from blog.models import User,Post
from blog import app,db,bcrypt
from flask_login import login_user,current_user,logout_user,login_required


@app.route("/")
@app.route("/home")
def home():
    page = request.args.get('page', 1, type=int)
    posts = Post.query.order_by(Post.date_posted.desc()).paginate(page=page, per_page=5)
    return render_template('home.html', posts=posts)

@app.route('/about')
def about():
    return render_template("about.html")

@app.route('/register',methods=['GET','POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('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 now login to your account.','success')
        return redirect(url_for('login'))
    return render_template('register.html',title='Register', form=form)

@app.route('/login',methods=['GET','POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('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('home'))
        else:
            flash('Unsuccessfull','danger')
    return render_template('login.html',title='Login', form=form)

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

@app.route('/account')
@login_required
def account():
    return render_template('account.html',title='Account')

@app.route("/post/new", methods=['GET', 'POST'])
@login_required
def new_post():
    form = PostForm()
    if form.validate_on_submit():
        post = Post(title=form.title.data, content=form.content.data, author=current_user)
        db.session.add(post)
        db.session.commit()
        flash('Your post has been created!', 'success')
        return redirect(url_for('home'))
    return render_template('create_post.html', title='New Post',
                           form=form, legend='New Post')


@app.route("/post/<int:post_id>")
@login_required
def post(post_id):
    post=Post.query.get_or_404(post_id)
    return render_template('post.html', title=post.title,post=post)

@app.route("/post/<int:post_id>/update", methods=['GET', 'POST'])
@login_required
def update_post(post_id):
    post=Post.query.get_or_404(post_id)
    if post.author !=current_user:
        abort(403)
    form=PostForm()
    if form.validate_on_submit():
        post.title=form.title.data
        post.content=form.content.data
        db.session.commit()
        flash('Your post has been Updated!','success')
        return redirect(url_for('post',post_id=post.id))
    elif request.method=='GET':
        form.title.data=post.title
        form.content.data=post.content
    return render_template('create_post.html', title='Update Post',form=form
                            ,legend='Update Post')

@app.route("/post/<int:post_id>/delete", methods=['POST'])
@login_required
def delete_post(post_id):
    post = Post.query.get_or_404(post_id)
    if post.author != current_user:
        abort(403)
    db.session.delete(post)
    db.session.commit()
    flash('Your post has been deleted!', 'success')
    return redirect(url_for('home'))

@app.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(page=page, per_page=5)
    return render_template('user_posts.html', posts=posts, user=user)
