from wtforms import SubmitField, StringField, HiddenField, validators, Form
from flask_wtf import FlaskForm
from flask import request, render_template
from __main__ import db, app, ma

################################################################################
# Class describing Author in the database, and via sqlalchemy, connected to the DB as well
################################################################################
class Author(db.Model):
    id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
    surname = db.Column(db.String(30), unique=False, nullable=False)
    firstnames = db.Column(db.String(50), unique=False, nullable=False)

    def __repr__(self):
        return "<id: {}, firstnames: {}, surname: {}>".format(self.id,self.firstnames, self.surname)

################################################################################
# Helper class that inherits a .dump() method to turn class Author into json / useful in jinja2
################################################################################
class AuthorSchema(ma.SQLAlchemyAutoSchema):
    class Meta:
        model = Author
        ordered = True

################################################################################
# Helper class that defines a form for author, used to make html <form>, with field validation (via wtforms)
################################################################################
class AuthorForm(FlaskForm):
    id = HiddenField()
    firstnames = StringField('FirstName(s):', [validators.DataRequired()])
    surname = StringField('Surname:', [validators.DataRequired()])
    submit = SubmitField('Save' )
    delete = SubmitField('Delete' )

################################################################################
# Routes for author data
#
# /authors -> GET only -> prints out list of all authors
################################################################################
@app.route("/authors", methods=["GET"])
def authors():
    authors = Author.query.all()
    return render_template("authors.html", authors=authors)

################################################################################
# /author/<id> -> GET/POST(save or delete) -> shows/edits/delets a single author
################################################################################
@app.route("/author/<id>", methods=["GET", "POST"])
def author(id):
    ### DDP: should this be request.form or request.values?
    alert="Success"
    author_form = AuthorForm(request.form)
    if request.method == 'POST' and author_form.validate_on_submit():
        id = request.form['id']
        author = Author.query.get(id)
        try:
            request.form['submit']
        except:
            message="Sorry, Deleting unsupported at present"
            alert="Danger"
        else:
            author.firstnames = request.form['firstnames']
            author.surname = request.form['surname']
            db.session.commit()
            message="Successfully Updated Author (id={})".format(id)
    else:
        author = Author.query.get(id)
        author_form = AuthorForm(request.values, obj=author)
        message=""
    return render_template("author.html", author=author, alert=alert, message=message, author_form=author_form)