"""
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, render_template, request, redirect, url_for, flash, send_from_directory, jsonify, abort
import json
from  sqlalchemy.sql.expression import func, select
from app.forms import UploadForm, EditForm, SearchForm, ChatForm
from app.models import Book, BookSchema, Author, AuthorSchema, Stack, StackSchema, UserIns, Chat, ChatSchema, Instance
from app.cover import get_cover
from app.extractText import extract_text
from os import environ
from flask_socketio import SocketIO, emit
import datetime
import time
from csv import DictWriter, DictReader
import io
from sqlalchemy.inspection import inspect

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()

    # 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="librarian", 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()
    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, 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)

    if request.method == 'POST':
        if user_form.validate_on_submit():
            # check if the post request has the file part
            title = user_form.title.data # You could also have used request.form['name']
            input_authors = user_form.author.data # You could also have used request.form['email']
            category = user_form.category.data
            year_published = user_form.year_published.data
            if year_published=="":
                year_published = None
            # save user to database
            #book = Book(title, author, filename, cover, file_extension)

            book = Book.query.filter_by(id=id).first()
            book.title = title
            book.category = category
            book.year_published = year_published

            #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)
            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()

    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
            year_published = upload_form.year_published.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):
                    filename = secure_filename(file.filename)
                    allbooks = db.session.query(Book).all()
                    id = len(allbooks)+1
                    new_filename = str(id) +"_"+ filename
                    fullpath = os.path.join(app.config['UPLOAD_FOLDER'], new_filename)
                    name, file_extension = os.path.splitext(new_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:
                #TO DO: make pdf generator
                #file = open('app/uploads/potential.pdf')
                #filename = 'potential.pdf'
                #file_extension = '.pdf'
                filename = ''
                file_extension = ''
                cover = ''

            book = Book(title, filename, cover, file_extension, category,year_published)
            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)


# 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/<int:id>', methods=['POST', 'GET'])
def show_stack_by_id(id):
    stack = Stack.query.get(id)
    if not stack:
        abort (404)
    else:
        return render_template('show_stack_detail.html', stack=stack)

@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)

## search

@app.route('/books', methods= ['POST','GET'])
def show_books():
    books = db.session.query(Book).all()
    search = SearchForm(request.form)
    if request.method == 'POST':
        return redirect((url_for('search_results', searchtype=search.select.data, query=search.search.data)))

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

@app.route('/search/<searchtype>/<query>/', methods=['POST', 'GET'])
def search_results(searchtype, query):
    search = SearchForm(request.form)
    random_order=Book.query.order_by(func.random()).limit(10)
    results=Book.query.filter(Book.title.contains(query)).all()

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

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

    if searchtype== 'All':
        results=Book.query.whoosh_search(query).all()

    if not results:
        upload_form = UploadForm(title= query, author='')
        return render_template('red_link.html', form=upload_form, title=query)

    if request.method == 'POST':
        query = search.search.data
        results = []
        return redirect((url_for('search_results', searchtype=search.select.data, query=search.search.data)))

    return render_template('results.html', form=search, books=results, books_all=random_order, searchtype=search.select.data, query=query)



@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']:
                        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)

                    if row['year_published']:
                        year_published = int(row['year_published'])
                    else:
                        year_published = None;
                    book = Book(row['title'], row['file'], cover, row['fileformat'], row['category'],year_published)
                    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_catalogue', 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")