"""
Flask Documentation:     http://flask.pocoo.org/docs/
Jinja2 Documentation:    http://jinja.pocoo.org/2/documentation/
Werkzeug Documentation:  http://werkzeug.pocoo.org/documentation/
This file creates your application.
"""

from app import app, db, socketio, DOMAIN
from flask import Flask, Response, session, render_template, request, redirect, url_for, flash, send_from_directory, jsonify, abort
import json
from  sqlalchemy.sql.expression import func, select
from sqlalchemy.sql import except_
from app.forms import UploadForm, EditForm, SearchForm, ChatForm, StackForm, AddtoStackForm, EditStackForm
from app.models import Book, BookSchema, Author, AuthorSchema, Stack, StackSchema, UserIns, Chat, ChatSchema, Instance, Potential
from app.cover import get_cover
from app.extractText import extract_text
from os import environ
from flask_socketio import SocketIO, emit
from weasyprint import HTML
import datetime
import time
from csv import DictWriter, DictReader
import io
from sqlalchemy.inspection import inspect
#import autocomplete
import sys

import os
from werkzeug.utils import secure_filename

# import sqlite3
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'epub', 'chm', 'mobi'])

author_schema = AuthorSchema()
authors_schema = AuthorSchema(many=True)
book_schema = BookSchema()
books_schema = BookSchema(many=True)
stack_schema = StackSchema()
stacks_schema = StackSchema(many=True)
chat_schema = ChatSchema()
chats_schema = ChatSchema(many=True)

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
###
# Routing for your application.
###

@app.route('/', methods= ['POST','GET'])
def home():
    chat_form = ChatForm()
    chat_messages = db.session.query(Chat).all()
    username = 'librarian'

    # if request.method == 'POST':
    #     if chat_form.validate_on_submit():
    #         message = chat_form.message.data
    #         msg = Chat(message)
    #         db.session.add(msg)
    #         db.session.commit()
    #client = request.remote_addr
    server = request.host
    if request.environ.get('HTTP_X_FORWARDED_FOR') is None:
        client =request.environ['REMOTE_ADDR']
    else:
        client = request.environ['HTTP_X_FORWARDED_FOR']

    return render_template('home.html',domain=DOMAIN,chat=chat_messages, channel = 1, username=username, client=client, server=server)

@app.route('/hello/<name>')
def hello(name):
    return "Hello " + name

@app.route('/about/')
def about():
    """Render the website's about page."""
    return render_template('about.html', name="Mary Jane")

@app.route('/uploads/<filename>')
def uploaded_file(filename):
    book = Book.query.filter_by(file=filename).first()
    i = Instance(request.host, "download")
    existing_ip = db.session.query(Instance).filter_by(ip=request.host).first()
    if existing_ip:
        i.name = existing_ip.name
    book.instances.append(i)
    db.session.commit()
    return send_from_directory(app.config['UPLOAD_FOLDER'],
                               filename)

@app.route('/uploads/cover/<filename>')
def uploaded_file_cover(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER_COVER'],
                               filename)

@app.route('/updates', methods=['POST', 'GET'])
def get_updates():
    userin = UserIns.query.filter_by(title="lastViewed").first()
    allbooks = db.session.query(Book).all()
    id = len(allbooks)
    latest_upload = allbooks[-1]
    return "This is the XPPL ~ Library XPUB ~ Updates / / / / / / / Last viewed: " + userin.info + " / / / / / / / " + str(len(allbooks)) + " Books online "+ " / / / / / / / " + "Latest upload: " + latest_upload.title

@app.route('/scape', methods=['POST', 'GET'])
def scape():
    if request.method == 'POST':
        data = request.form
        book = Book.query.get(data['id'])
        print(book.scapeX)
        book.scapeX = data['x']
        book.scapeY = data['y']
        db.session.commit()
    books = db.session.query(Book).all() # or you could have used User.query.all()
    all_instances = db.session.query(Instance).all()
    instances = []
    for instance in all_instances:
        exists = False
        for existing_inst in instances:
            if existing_inst.name == instance.name:
                exists = True
                break
            else:
                exists = False
        if not exists:
            instances.append(instance)
    return render_template('scape.html', books=books, instances=instances)


@app.route('/books_grid')
def show_books_grid():
    books = db.session.query(Book).all() # or you could have used User.query.all()
    return render_template('show_books_grid.html', books=books)

@app.route('/books/<int:id>')
def show_book_by_id(id):
    book = Book.query.get(id)
    all_instances = db.session.query(Instance).all()
    previousbook = Book.query.filter_by(id=id - 1).first()
    nextbook = Book.query.filter_by(id=id + 1).first()
    allbooks = db.session.query(Book).all()
    edge = len(allbooks)
    if id == 1:
        previousbook = None
    if id == edge:
        nextbook = None

    userin = UserIns.query.filter_by(title="lastViewed").first()
    if userin != None:
        userin.info = book.title
        db.session.commit()
    else:
        user_info = UserIns("lastViewed", book.title)
        db.session.add(user_info)
        db.session.commit()
    if not book:
        return render_template('red_link.html', id=id)
    else:
        return render_template('show_book_detail.html', book=book, previousbook = previousbook, nextbook = nextbook, all_instances=all_instances)


@app.route('/books/<int:id>/delete', methods=['POST', 'GET'])
def remove_book_by_id(id):
    book_to_edit = Book.query.filter_by(id=id).first()
    title = book_to_edit.title
    Book.query.filter_by(id=id).delete()
    #author_table = Author.query.filter_by(book_id=book_to_edit.id).delete()
    db.session.commit()
    flash("%s deleted from library" % (title))
    return redirect(url_for('show_books'))

@app.route('/books/<int:id>/edit', methods=['POST', 'GET'])
def edit_book_by_id(id):
    book_to_edit = Book.query.filter_by(id=id).first()
    user_form = EditForm(title = book_to_edit.title, author =book_to_edit.authors, category = book_to_edit.category, year_published= book_to_edit.year_published, message= book_to_edit.message, sameness=book_to_edit.sameness, gender=book_to_edit.gender, diversity=book_to_edit.diversity, who=book_to_edit.who)

    if request.method == 'POST':
        if user_form.validate_on_submit():
            # on submit, check fields
            title = user_form.title.data
            input_authors = user_form.author.data
            category = user_form.category.data
            year_published = user_form.year_published.data
            message = user_form.message.data
            sameness = user_form.sameness.data
            gender = user_form.gender.data
            diversity = user_form.diversity.data
            who = user_form.who.data

            if year_published=="":
                year_published = None
            book = Book.query.filter_by(id=id).first()
            book.title = title
            book.category = category
            book.year_published = year_published
            book.message = message
            book.sameness = sameness
            book.gender = gender
            book.diversity = diversity
            book.who = who

            #authors update
            book.authors.clear()
            for i, author in enumerate(input_authors):
                author_name = author.get("author_name")
                if author_name:
                    a = db.session.query(Author).filter_by(author_name=author_name).first()
                    if a == None:
                        a = Author(author_name=author_name)
                        db.session.add(a)
                    book.authors.append(a)
            i = Instance(request.host, "edit")
            existing_ip = db.session.query(Instance).filter_by(ip=request.host).first()
            if existing_ip:
                i.name = existing_ip.name
            book.instances.append(i)

            # editing / uploading new file
            if user_form.file.data:
                file = request.files['file']
                if file.filename == '':
                    flash('No selected file')
                    return redirect(request.url)
                if file and allowed_file(file.filename):
                    allbooks = db.session.query(Book).all()
                    id = book.id

                    filename = str(id) + "_" + secure_filename(file.filename)
                    fullpath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
                    name, file_extension = os.path.splitext(filename)
                    file.save(fullpath)
                    book.cover = get_cover(fullpath, name)
                    book.file = filename
                else:
                    flash('allowed file formats: %s' % ALLOWED_EXTENSIONS)

            db.session.commit()
            flash("%s updated" % (title))
            return redirect(url_for('show_book_by_id', id=id))

    return render_template('edit_book_detail.html', book=book_to_edit, form=user_form)


@app.route('/add-book', methods=['POST', 'GET'])
def add_book():
    upload_form = UploadForm()
    allbooks = db.session.query(Book).all()
    books_all = len(allbooks)
    allauthors = db.session.query(Author).all()
    authors_all = len(allauthors)
    stacks_all = [s.stack_name for s in db.session.query(Stack.stack_name)]
    categories = [r.category for r in db.session.query(Book.category).distinct()]
    allpotential = db.session.query(Book).filter(Book.file.contains('potential.pdf')).all()
    books_potential = len(allpotential)
    earliest = db.session.query(func.min(Book.year_published)).scalar()
    latest = db.session.query(func.max(Book.year_published)).scalar()


    if request.method == 'POST':
        if upload_form.validate_on_submit():
            #get data from form
            title = upload_form.title.data
            authors = upload_form.author.data
            category = upload_form.category.data
            message = upload_form.message.data
            year_published = upload_form.year_published.data
            sameness = upload_form.sameness.data
            gender = upload_form.gender.data
            diversity = upload_form.diversity.data
            who = upload_form.who.data

            if year_published=="":
                year_published = None

            #if upload with file
            if upload_form.upload.data:
                # check if the post request has the file part
                if 'file' not in request.files:
                    flash('No file part')
                    return redirect(request.url)
                file = request.files['file']
                # if user does not select file, browser also
                # submit a empty part without filename
                if file.filename == '':
                    flash('No selected file')
                    return redirect(request.url)
                if file and allowed_file(file.filename):
                    allbooks = db.session.query(Book).all()
                    id = len(allbooks)+1
                    filename = str(id) + "_" + secure_filename(file.filename)

                    fullpath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
                    name, file_extension = os.path.splitext(filename)
                    file.save(fullpath)
                    try:
                        cover = get_cover(fullpath, name)
                    except:
                        cover = ''

                    extract_text(fullpath, name)

                else:
                    flash('allowed file formats: %s' % ALLOWED_EXTENSIONS)
            #if upload without file -> wishform, with potential PDF
            if upload_form.wish.data:
                #pdf generator
                filename = 'potential.pdf'
                file_extension = '.pdf'
                cover= ''
                ptitle = upload_form.title.data
                pbook = Potential(ptitle)
                db.session.add(pbook)
                db.session.commit()
                pbooks = Potential.query.all()
                template = 'app/templates/potential_pdf.html'
                html_string = render_template('potential_pdf.html', pbooks = pbooks)
                html = HTML(string=html_string)
                html.write_pdf(target='app/uploads/potential.pdf');

            book = Book(title, filename, cover, file_extension, category, year_published, message, sameness, diversity, gender, who)
            db.session.add(book)
            for author in authors:
                author_name = author.get("author_name")
                if author_name:
                    a = db.session.query(Author).filter_by(author_name=author_name).first()
                    if a == None:
                        a = Author(author_name=author_name)
                        db.session.add(a)
                    book.authors.append(a)
            i = Instance(request.host, "add")
            existing_ip = db.session.query(Instance).filter_by(ip=request.host).first()
            if existing_ip:
                i.name = existing_ip.name
            book.instances.append(i)
            db.session.commit()

            flash("%s added to the library" % (title))
            return redirect(url_for('show_books'))

    flash_errors(upload_form)
    return render_template('add_book.html', form=upload_form, books_all=books_all, authors_all=authors_all, categories=categories, stacks_all=stacks_all, books_potential=books_potential, earliest=earliest, latest=latest)


# Flash errors from the form if validation fails
def flash_errors(form):
    for field, errors in form.errors.items():
        for error in errors:
            flash(u"Error in the %s field - %s" % (
                getattr(form, field).label.text,
                error
            ))

#Authors

@app.route('/authors/<int:id>')
def show_author_by_id(id):
    author = Author.query.get(id)
    if not author:
        abort (404)
    else:
        return render_template('show_author_detail.html', author=author)


@app.route('/authors/<int:id>/edit', methods=['POST', 'GET'])
def edit_author_by_id(id):
    return "Ask the programmer."

##stacks

@app.route('/stacks')
def show_stacks():
    stacks = db.session.query(Stack).all()
    return render_template('show_stacks.html', stacks=stacks)

@app.route('/stacks/add_stack', methods=['POST', 'GET'])
def add_stack():
    form = StackForm()
    stacks = db.session.query(Stack).all()

    if form.validate_on_submit():
        stack_name = form.stack_name.data
        stack_description = form.stack_description.data
        stack_author = form.stack_author.data
        stack = Stack(stack_name, stack_description, stack_author)
        if form.stack_name.data:
            stack = Stack(stack_name, stack_description, stack_author)
            db.session.add(stack)
        stacks = db.session.query(Stack).all()
        return redirect(url_for('show_stacks'))
        flash("%s stack created" % (stack_name))
    return render_template('add_stack.html', stacks=stacks, form=form)

@app.route('/stacks/tab/<int:id>', methods=['POST', 'GET'])
def show_stack_in_tab(id):
    return show_stack_by_id(id, is_tab=True)


@app.route('/stacks/<int:id>', methods=['POST', 'GET'])
def show_stack_by_id(id, is_tab=False):

    stack = Stack.query.get(id)
    if not stack:
        return render_template('add_stack.html', stacks=stacks, form=form)
    else:
        if is_tab == False:
            return render_template('show_stack_detail.html', stack=stack)
        else:
            return render_template('show_stack_detail_tab.html', stack=stack)

@app.route('/stacks/<int:id>/delete', methods=['POST', 'GET'])
def remove_stack_by_id(id):
    Stack.query.filter_by(id=id).delete()
    db.session.commit()
    return redirect(url_for('show_stacks'))

@app.route('/stacks/<int:id>/edit', methods=['POST', 'GET'])
def edit_stack_by_id(id):
    stack = Stack.query.filter_by(id=id).first()
    form = EditStackForm(edit_stack_name = stack.stack_name, edit_stack_description = stack.stack_description)

    if request.method == 'POST':
        if form.validate_on_submit():
            stack_name = form.edit_stack_name.data
            stack_description = form.edit_stack_description.data
        stack.stack_name = stack_name
        stack.stack_description = stack_description
        db.session.commit()
        return redirect(url_for('show_stack_by_id', id=id))
    return render_template('edit_stack_detail.html', stack=stack, form=form)

@app.route('/instances', methods=['POST', 'GET'])
def show_instances():
    all_instances = db.session.query(Instance).all()
    instances = []
    for instance in all_instances:
        exists = False
        for existing_inst in instances:
            if existing_inst.name == instance.name:
                exists = True
                break
            else:
                exists = False
        if not exists:
            instances.append(instance)

    if request.method == 'POST':
        for item in request.form.items():
            for i, itm in enumerate(item):
                if i == 0:
                    oldname = itm
                if i == 1:
                    name = itm

        all_instances = db.session.query(Instance).filter_by(name=oldname).all()
        for instance in all_instances:
            instance.name = name
        print(oldname)
        print(name)
        db.session.commit()
    return render_template('show_instances.html', instances=instances)

@app.route('/stacks/<int:stackid>/remove/<int:bookid>', methods=['POST', 'GET'])
def remove_from_stack(bookid, stackid):
    book = Book.query.get(bookid)
    stack = Stack.query.get(stackid)
    if book not in stack.books:
        return render_template('show_book_detail.html', book=book)
    stack.books.remove(book)
    db.session.commit()
    return render_template('show_book_detail.html', book=book)

## search
view = ['1']

@app.route('/books', methods= ['POST','GET'])
def show_books():
    books = db.session.query(Book).order_by(Book.title)
    search = SearchForm(request.form)
    view.append('1')
    viewby = '1'

    if search.grid.data:
        viewby = '2'
        view.append('2')
        return render_template ('show_books_grid.html', books=books, form=search)

    if search.listview.data:
        viewby = '1'
        view.append('1')
        return render_template ('show_books.html', books=books, form=search)

    if request.method == 'POST':
        newmsg = 'searched for: ' + search.search.data
        socketio.emit('channel-' + str(1), {
        'username': 'Search form',
        'text': search.search.data,
        'time': str(datetime.datetime.utcnow().strftime("%d.%m.%Y %H:%M"))}, broadcast=True)
        # Save message
        my_new_chat = Chat(message=newmsg)
        db.session.add(my_new_chat)
        try:
            db.session.commit()
        except:
            db.session.rollback()
        return redirect((url_for('search_results', searchtype=search.select.data, query=search.search.data, viewby=viewby)))

    return render_template('show_books.html', books=books, form=search)

@app.route('/search/<searchtype>/<viewby>/<query>', methods=['POST', 'GET'])
def search_results(searchtype, query, viewby):
    search = SearchForm(request.form, search=query)
    results=Book.query.filter(Book.title.contains(query)).order_by(Book.title)
    allbooks = set(Book.query.all())
    viewby = view[-1]

    if searchtype == 'Title':
        results=Book.query.filter(Book.title.contains(query)).order_by(Book.title)

    if searchtype == 'Category':
        results=Book.query.filter(Book.category.contains(query)).order_by(Book.title)

    if searchtype== 'Author':
        results=db.session.query(Book).join(Book.authors).filter(Author.author_name.contains(query)).order_by(Book.title)

    if searchtype== 'Stack':
        results=db.session.query(Book).join(Book.stacks).filter(Stack.stack_name.contains(query)).order_by(Book.title)

    if searchtype== 'Outliers':
        results=Book.query.filter(Book.sameness > 50).order_by(Book.title)

    if searchtype== 'All':
        # results=Book.query.whoosh_search(query)
        results=Book.query.filter(Book.title.contains(query))
        results=results.union(Book.query.filter(Book.category.contains(query)))
        results=results.union(Book.query.filter(Book.year_published.contains(query)))
        results=results.union(db.session.query(Book).join(Book.authors).filter(Author.author_name.contains(query)))
        results=results.union(db.session.query(Book).join(Book.stacks).filter(Stack.stack_name.contains(query))).order_by(Book.title)

    if results.count() == 0:
        books = Book.query.filter(Book.file.like('potential.pdf'))
        upload_form = UploadForm(title= query, author='')
        return render_template('red_link.html', form=upload_form, title=query, books=books)

    count = results.count()
    whole = Book.query.count()
    percentage = float(count / whole * 100)
    fbooks = set(results)
    books_all = allbooks - fbooks

    if search.listview.data:
        view.append('1')
        return render_template('results.html', books=results, form=search, query=query, books_all=books_all, searchtype=search.select.data, count = count, whole = whole, percentage = percentage)

    if search.grid.data:
        view.append('2')
        return render_template('results_grid.html', books=results, form=search, query=query, books_all=books_all, searchtype=search.select.data, count = count, whole = whole, percentage = percentage)

    if request.method == 'POST':
        newmsg = 'searched for: ' + search.search.data
        socketio.emit('channel-' + str(1), {
        'username': 'Search form',
        'text': search.search.data,
        'time': str(datetime.datetime.utcnow().strftime("%d.%m.%Y %H:%M"))}, broadcast=True)
        # Save message
        my_new_chat = Chat(message=newmsg)
        db.session.add(my_new_chat)
        try:
            db.session.commit()
        except:
            db.session.rollback()

        query = search.search.data
        results = []
        if viewby == '1':
            print (view[-1])
            return redirect((url_for('search_results', searchtype=search.select.data, query=search.search.data, viewby=viewby)))
        else:
            return redirect((url_for('search_results', searchtype=search.select.data, query=search.search.data, viewby=viewby)))

    if viewby == '2':
        return render_template('results_grid.html', form=search, books=results, books_all=books_all, searchtype=search.select.data, query=query, count = count, whole = whole, percentage = percentage)

    else:
        return render_template('results.html', form=search, books=results, books_all=books_all, searchtype=search.select.data, query=query, count = count, whole = whole, percentage = percentage)


# ## Search - autocomplete
# autocomplete_suggestions = []

# @app.route('/autocomplete_suggestions', methods=['GET', 'POST'])
# def test1():
#     if request.method == 'POST':
#         autocomplete.load()
#         query = request.form['search']
#         query_tokenized = query.lower().split()
#         print(query_tokenized)
#         word_1 = query_tokenized[-2]
#         word_2 = query_tokenized[-1]
#         #print(word_1)
#         autocomplete_output = autocomplete.predict(word_1 , word_2)
#         autocomplete_suggestions.clear()
#         for suggestion, score in autocomplete_output:
#             autocomplete_suggestions.append(suggestion)
#
#         session['autocomplete_suggestions'] = str(autocomplete_suggestions)
#
#         print(session['autocomplete_suggestions'])
#
#     return Response(json.dumps(session['autocomplete_suggestions']), mimetype='application/json')

## STACKS!

@app.route('/add_to_stack/<int:id>', methods=['GET', 'POST'])
def add_to_stack(id):
    stacks = db.session.query(Stack).all()
    add_form = AddtoStackForm(request.form)
    add_form.select_stack.choices = [(stack.id, stack.stack_name) for stack in stacks]
    if request.method == 'GET':
        book = Book.query.get(id)
        return render_template('add_to_stacks.html', id=id, stacks=stacks, book=book, add_form=add_form)
    else:
        stack = Stack.query.get(int(add_form.select_stack.data))
        book = Book.query.get(id)
        stack.books.append(book)
        db.session.commit()
        return render_template('show_stack_detail.html', stack=stack)


@app.route('/export/csv', methods=['GET'])
def export_csv():
    output = io.StringIO()
    #fieldnames = ['title', 'authors', 'file', 'fileformat', 'category', 'year_published', 'description' ]
    fields = Book.__mapper__.columns
    fieldnames = []
    for columns in fields:
        fieldnames.append(columns.name)
    i = inspect(Book)
    referred_classes = [r.mapper.class_ for r in i.relationships]
    referred_classes_tablenames = [r.mapper.class_.__tablename__ for r in i.relationships]
    print(fieldnames+referred_classes_tablenames)
    csv = DictWriter(output,fieldnames+referred_classes_tablenames)
    csv.writeheader()
    for book in Book.query.order_by("title"):
        row = {}
        for col in fieldnames:
            print(getattr(book, col))
            row[col] = getattr(book, col)
        for col in referred_classes:
            subattr = []
            for subcol in getattr(book, col.__tablename__):
                for metacol in subcol.__mapper__.columns:
                    query = metacol.name
                    if query != "id":
                        this = getattr(subcol, query)
                        subattr.append(this)
            row[col.__tablename__] = " | ".join(subattr)
        csv.writerow(row)
    #print(row)
    resp = Response(output.getvalue(), mimetype="text/csv")
    resp.headers["Content-Disposition"] = "attachment;filename=export.csv"
    return resp

import codecs
@app.route('/import/csv', methods= ['POST','GET'])
def import_csv():
    if request.method == 'POST':
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        else:
            file = request.files['file']
            for row in DictReader(codecs.iterdecode(file, 'utf-8')):
                numberadded = 0;
                book = Book.query.filter_by(title=row['title']).first()
                if book:
                    print("allreadyexists")
                else:
                    cover = ''
                    if row['file'] == '':
                        file = 'potential.pdf'
                        file_extension = '.pdf'
                        ptitle = row['title']
                        pbook = Potential(ptitle)
                        db.session.add(pbook)
                        db.session.commit()
                        pbooks = Potential.query.all()
                        template = 'app/templates/potential_pdf.html'
                        html_string = render_template('potential_pdf.html', pbooks = pbooks)
                        html = HTML(string=html_string)
                        html.write_pdf(target='app/uploads/potential.pdf')
                        print ('writing to potential_pdf')

                    else:
                        fullpath = os.path.join(app.config['UPLOAD_FOLDER'], row['file'])
                        name, file_extension = os.path.splitext(row['file'])
                        print ('get_cover', fullpath, name)
                        cover = get_cover(fullpath, name)
                        file = str(id) + "_" + row['file']

                    if row['year_published']:
                        year_published = int(row['year_published'])
                    else:
                        year_published = None;
                    book = Book(row['title'], file, cover, row['fileformat'], row['category'],year_published, None, None, None, None, None)
                    book.scapeX = float(row['scapeX'])
                    book.scapeY = float(row['scapeY'])

                    db.session.add(book)
                    numberadded = numberadded+1
                    authors = row['authors'].split('|')
                    authors = [x.strip() for x in authors]
                    for author in authors:
                        if author:
                            a = db.session.query(Author).filter_by(author_name=author).first()
                            if a == None:
                                a = Author(author_name=author)
                                db.session.add(a)
                            book.authors.append(a)
            db.session.commit()
    return render_template('import_csv.html', numberadded=numberadded)


@app.route('/empty_catalogue487352698237465', methods= ['POST','GET'])
def empty_catalogue():
    meta = db.metadata
    for table in reversed(meta.sorted_tables):
        if str(table) == "books" or str(table) == "authors" or str(table) == "books_authors":
            print('Clear table %s' % table)
            db.session.execute(table.delete())
    db.create_all()
    db.session.commit()
    return "ALL CLEARED"

###
# The API
###

@app.route('/api/books', methods=['GET'])
def get_books():
    books = Book.query.all()
    data = books_schema.dump(books)
    #print(errors)
    return jsonify({'books': data})

@app.route('/api/books/<int:id>', methods=['GET'])
def get_book_by_id(id):
    book = Book.query.get(id)
    data = book_schema.dump(book)
    if not data:
        return jsonify({"message": "Book could not be found."}), 400
    else:
        return jsonify({'book': data })

@app.route('/api/chats', methods=['GET'])
def get_chat():
    chats = Chat.query.all()
    data = chats_schema.dump(chats)
    #print(errors)
    return jsonify({'chat': data})



###
# The functions below should be applicable to all Flask apps.
###

@app.route('/<file_name>.txt')
def send_text_file(file_name):
    """Send your static text file."""
    file_dot_text = file_name + '.txt'
    return app.send_static_file(file_dot_text)


@app.after_request
def add_header(response):
    """
    Add headers to both force latest IE rendering engine or Chrome Frame,
    and also to cache the rendered page for 10 minutes.
    """
    response.headers['X-UA-Compatible'] = 'IE=Edge,chrome=1'
    response.headers['Cache-Control'] = 'public, max-age=600'
    return response


@app.errorhandler(404)
def page_not_found(error):
    """Custom 404 page."""
    return render_template('404.html'), 404


### SOCKET for the chat

@socketio.on('new_message')
def new_message(message):
    # Send message to all users
    # print("new message")
    # channel is always 1 now, but might be interesting for further development
    emit('channel-' + str(message['channel']), {
        'username': message['username'],
        'text': message['text'],
        'time': str(datetime.datetime.utcnow().strftime("%d.%m.%Y %H:%M"))
    },
        broadcast=True
    )
    # Save message
    my_new_chat = Chat(
        message=message['text']
    )

    db.session.add(my_new_chat)
    try:
        db.session.commit()
    except:
        db.session.rollback()


if __name__ == '__main__':
    socketio.run(app)
    #app.run(debug=True,host="0.0.0.0",port="8080")