import codecs
import datetime
import io
import json
import os
from csv import DictReader, DictWriter
from functools import wraps
from urllib.parse import quote as urlquote

import autocomplete
from xppl.database import db
from xppl.socketio import socketio
from xppl.cover import get_cover
from xppl.extractText import extract_text
from xppl.forms import (
    AddtoStackForm, EditForm, EditStackForm,
    SearchForm, StackForm, UploadForm
)
from xppl.getannot import get_annot_book, get_annot_results, get_annotations
from xppl.models import (
    Author, AuthorSchema, Book, BookSchema, Chat,
    ChatSchema, Instance, Potential, Stack, StackSchema,
    UserIns
)
from flask import (
    Response, abort, flash, jsonify, redirect,
    render_template, request, send_from_directory,
    url_for, current_app as app
)
from flask_socketio import emit
from flask_weasyprint import HTML, render_pdf
from sqlalchemy.inspection import inspect
from sqlalchemy.sql.expression import func
from werkzeug.utils import secure_filename

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):
    extension = filename.rsplit('.', 1)[1].lower()
    return '.' in filename and extension in ALLOWED_EXTENSIONS

###
# Routing for your application.
###


def check_light(func):
    @wraps(func)
    def decorated_function(*args, **kwargs):
        if not app.config['LIGHT']:
            return func(*args, **kwargs)
        else:
            flash("Your account has expired. Update your billing info.")
            return redirect(url_for('home'))

    return decorated_function


@app.route('/', methods=['POST', 'GET'])
def home():
    chat_messages = db.session.query(Chat).all()
    username = 'librarian'
    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=app.config['DOMAIN'],
        chat=chat_messages,
        channel=1,
        username=username,
        client=client,
        server=server,
        light=app.config['LIGHT'],
    )


@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', light=app.config['LIGHT'])


@app.route('/uploads/<filename>')
@check_light
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)


# annotations
@app.route('/annotations')
def annotations():
    """Render annotations page."""
    books = db.session.query(Book).all()
    annot = get_annotations()
    return render_template(
        'annotations.html',
        annot=annot,
        books=books,
        light=app.config['LIGHT']
    )


# PDF from annotations
@app.route('/annotations.pdf')
def annotations_pdf():
    annot = get_annotations()
    # Make a PDF straight from HTML in a string.
    html = render_template(
        'annotations.html',
        annot=annot,
        light=app.config['LIGHT'],
    )
    return render_pdf(HTML(string=html))


@app.route('/viewpdf/<filename>')
def viewtestfile1_file(filename):
    return redirect((
        "/static/viewer/web/viewer.html?file=%2Fuploads%2F"
        +
        urlquote(filename)
    ))


@app.route('/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()
    latest_upload = allbooks[-1]
    return (
        "This is the XPPL ~ Library XPUB ~ Updates / / / / / / / Last viewed: "
        + userin.info
        + " / / / / / / / "
        + str(len(allbooks))
        + " Books online "
        + " / / / / / / / "
        + "Latest entry: "
        + latest_upload.title
    )


@app.route('/volumetric_catalog', methods=['GET'])
def volumetric_catalog():
    return render_template('volumetric_catalog/index.html')


@app.route('/scape', methods=['POST', 'GET'])
def scape():
    if request.method == 'POST':
        data = request.form
        book = Book.query.get(data['id'])
        book.scapeX = data['x']
        book.scapeY = data['y']
        db.session.commit()
    books = db.session.query(Book).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('/scape_new', methods=['POST', 'GET'])
def scape_new():
    return render_template('scape_new.html')


@app.route('/books_grid')
def show_books_grid():
    books = db.session.query(Book).all()
    return render_template(
        'show_books_grid.html',
        books=books,
        light=app.config['LIGHT']
    )


@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

    name = book.file
    annot = get_annotations()
    res = get_annot_book(annot, name)

    userin = UserIns.query.filter_by(title="lastViewed").first()
    if userin is not 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,
            light=app.config['LIGHT']
        )
    else:
        return render_template(
            'show_book_detail.html',
            book=book,
            previousbook=previousbook,
            nextbook=nextbook,
            all_instances=all_instances,
            name=name,
            annot=annot,
            res=res,
            light=app.config['LIGHT']
        )


@app.route('/books/<int:id>/delete', methods=['POST', 'GET'])
@check_light
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()
    db.session.commit()
    flash("%s deleted from library" % (title))
    return redirect(url_for('show_books'))


@app.route('/books/<int:id>/edit', methods=['POST', 'GET'])
@check_light
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():
            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

            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 is 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):
                    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 = ""

                    try:
                        get_cover(fullpath, name)
                    except Exception:
                        print("couldn't get cover")

                    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,
        light=app.config['LIGHT']
    )


@app.route('/add-book', methods=['POST', 'GET'])
@check_light
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():
            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 Exception:
                        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 = 'default_cover.gif'
                ptitle = upload_form.title.data
                pbook = Potential(ptitle)
                db.session.add(pbook)
                db.session.commit()
                pbooks = Potential.query.all()
                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 is 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,
        light=app.config['LIGHT']
    )


# 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,
            light=app.config['LIGHT']
        )


@app.route('/authors/<int:id>/edit', methods=['POST', 'GET'])
@check_light
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,
        light=app.config['LIGHT']
    )


@app.route('/stacks/add_stack', methods=['POST', 'GET'])
@check_light
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,
        light=app.config['LIGHT']
    )


@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:
        abort(404)

    if not is_tab:
        return render_template(
            'show_stack_detail.html',
            stack=stack,
            light=app.config['LIGHT']
        )
    else:
        return render_template(
            'show_stack_detail_tab.html',
            stack=stack,
            light=app.config['LIGHT']
        )


@app.route('/stacks/<int:id>/delete', methods=['POST', 'GET'])
@check_light
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'])
@check_light
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,
        light=app.config['LIGHT']
    )


@app.route('/instances', methods=['POST', 'GET'])
@check_light
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

        db.session.commit()

    return render_template(
        'show_instances.html',
        instances=instances,
        light=app.config['LIGHT']
    )


@app.route(
    '/stacks/<int:stackid>/remove/<int:bookid>',
    methods=['POST', 'GET']
)
@check_light
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,
            light=app.config['LIGHT']
        )
    stack.books.remove(book)
    db.session.commit()
    return render_template(
        'show_book_detail.html',
        book=book,
        light=app.config['LIGHT']
    )

# 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,
            light=app.config['LIGHT']
        )

    if search.listview.data:
        viewby = '1'
        view.append('1')
        return render_template(
            'show_books.html',
            books=books,
            form=search,
            light=app.config['LIGHT']
        )

    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.now().strftime("%d.%m.%Y %H:%M"))
        }, broadcast=True)

        my_new_chat = Chat(message=newmsg)
        db.session.add(my_new_chat)

        try:
            db.session.commit()
        except Exception:
            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,
        light=app.config['LIGHT']
    )


@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.filter(Book.title.contains(query))
            .union(Book.query.filter(Book.category.contains(query)))
            .union(Book.query.filter(Book.year_published.contains(query)))
            .union(
                db.session.query(Book)
                .join(Book.authors)
                .filter(Author.author_name.contains(query))
            )
            .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,
            light=app.config['LIGHT']
        )

    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,
            light=app.config['LIGHT']
        )

    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,
            light=app.config['LIGHT']
        )

    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.now().strftime("%d.%m.%Y %H:%M"))
        }, broadcast=True)

        my_new_chat = Chat(message=newmsg)
        db.session.add(my_new_chat)

        try:
            db.session.commit()
        except Exception:
            db.session.rollback()

        query = search.search.data
        results = []

        if viewby == '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,
            light=app.config['LIGHT']
        )

    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,
            light=app.config['LIGHT']
        )


autocomplete_suggestions = []
autocomplete.load()


@app.route('/autocomplete_suggestions', methods=['GET', 'POST'])
def autocomplete_search():
    if request.method == 'GET':
        query = request.args.get('q')
        query_tokenized = query.split()
        word_1 = query_tokenized[-2]
        word_2 = query_tokenized[-1]
        autocomplete_output = autocomplete.predict(word_1, word_2)
        autocomplete_suggestions.clear()
        for suggestion, score in autocomplete_output:
            autocomplete_suggestions.append(suggestion)

    return Response(
        json.dumps(autocomplete_suggestions),
        mimetype='application/json'
    )


@app.route('/search_annot', methods=['POST', 'GET'])
def search_annot():
    books = db.session.query(Book).all()
    name = str(request.args.get('query'))
    annot = get_annotations()
    res = get_annot_results(annot, name)
    return render_template(
        'results_annot.html',
        name=name,
        annot=annot,
        res=res,
        books=books
    )


# STACKS!

@app.route('/add_to_stack/<int:id>', methods=['GET', 'POST'])
@check_light
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,
            light=app.config['LIGHT']
        )
    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,
            light=app.config['LIGHT']
        )


@app.route('/export/csv', methods=['GET'])
@check_light
def export_csv():
    output = io.StringIO()
    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
    ]

    csv = DictWriter(
        output,
        fieldnames + referred_classes_tablenames
    )

    csv.writeheader()
    for book in Book.query.order_by("title"):
        row = {}
        for col in fieldnames:
            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)

    resp = Response(output.getvalue(), mimetype="text/csv")
    resp.headers["Content-Disposition"] = "attachment;filename=export.csv"

    return resp


@app.route('/import/csv', methods=['POST', 'GET'])
@check_light
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 = (
                    db.session.query(Book)
                    .filter(Book.title == row['title'])
                    .first()
                )
                if book:
                    print("allreadyexists")
                else:
                    cover = ''
                    if row['file'] == '':
                        file = 'potential.pdf'
                        file_extension = '.pdf'
                        cover = "default_cover.gif"
                        ptitle = row['title']
                        pbook = Potential(ptitle)
                        db.session.add(pbook)
                        db.session.commit()
                        pbooks = Potential.query.all()
                        html_string = render_template(
                            'potential_pdf.html',
                            pbooks=pbooks
                        )
                        html = HTML(string=html_string)
                        html.write_pdf(target='app/uploads/potential.pdf')

                    else:
                        fullpath = os.path.join(
                            app.config['UPLOAD_FOLDER'], row['file']
                        )
                        name, file_extension = os.path.splitext(row['file'])

                        try:
                            cover = get_cover(fullpath, name)
                        except Exception:
                            print("couldn't get cover")

                        file = 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
                    )
                    if row['scapeX']:
                        book.scapeX = float(row['scapeX'])
                    if row['scapeY']:
                        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 is 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,
        light=app.config['LIGHT']
    )


@app.route('/emptycataloguexpubxpubfuck', methods=['POST', 'GET'])
@check_light
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"):
            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)
    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)
    return jsonify({'chat': data})


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

@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'] = 'no-cache'
    return response


@app.errorhandler(404)
def page_not_found(error):
    """Custom 404 page."""
    return render_template('404.html', light=app.config['LIGHT']), 404


# SOCKET for the chat

@socketio.on('new_message')
def new_message(message):
    emit('channel-' + str(message['channel']), {
        'username': message['username'],
        'text': message['text'],
        'time': str(datetime.datetime.now().strftime("%d.%m.%Y %H:%M"))
    }, broadcast=True)
    my_new_chat = Chat(message=message['text'])

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


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