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

################################################################################
# Class describing Author in the database, and via sqlalchemy, connected to the DB as well
################################################################################
class Author(db.Model):
    id = db.Column(db.Integer, db.Sequence('author_id_seq'), 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, alert=st.GetAlert(), message=st.GetMessage() )
 

################################################################################
# /author -> GET/POST -> creates a new author type and when created, takes you back to /authors
################################################################################
@app.route("/author", methods=["GET", "POST"])
def new_author():
    form = AuthorForm(request.form)
    if 'surname' not in request.form:
        return render_template("edit_id_name.html", form=form, page_title='Create new Author' )
    else:
        author = Author( surname=request.form["surname"], firstnames=request.form["firstnames"] )
        db.session.add(author)
        db.session.commit()
        st.SetMessage( "Created new Author ({})".format(author) )
        return redirect( '/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?
    form = AuthorForm(request.form)
    if request.method == 'POST' and form.validate():
        author = Author.query.get(id)
        if 'delete' in request.form:
            st.SetMessage("Successfully deleted Author: ({})".format( author ) )
            author = Author.query.filter(Author.id==id).delete()
        if 'submit' in request.form:
            st.SetMessage("Successfully Updated Author: (From: {}".format(author) )
            author.surname = request.form['surname']
            author.firstnames = request.form['firstnames']
            st.AppendMessage(" To: {}".format(author) )
        db.session.commit()
        return redirect( '/authors' )
    else:
        author = Author.query.get(id)
        form = AuthorForm(request.values, obj=author)
    return render_template("edit_id_name.html", object=author, form=form)

################################################################################
# helper fund to GetAuthors -> author_list -> jinja2 for author drop-down in book.html
################################################################################
def GetAuthors():
    return Author.query.order_by('surname','firstnames').all()