from wtforms import SubmitField, StringField, HiddenField, validators, TextAreaField
from flask_wtf import FlaskForm
from flask import request, render_template
from wtforms.fields.html5 import DateField
from __main__ import db, app, ma

################################################################################
# Class describing Loan in the database, and via sqlalchemy, connected to the DB as well
################################################################################
class Loan(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)
    contact_details = db.Column(db.String(256), unique=False, nullable=False)
    date_lent = db.Column(db.Date, 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 Loan into json / useful in jinja2
################################################################################
class LoanSchema(ma.SQLAlchemyAutoSchema):
    class Meta:
        model = Loan
        ordered = True

################################################################################
# Helper class that defines a form for loan, used to make html <form>, with field validation (via wtforms)
################################################################################
class LoanForm(FlaskForm):
    id = HiddenField()
    firstnames = StringField('FirstName(s):', [validators.DataRequired()])
    surname = StringField('Surname:', [validators.DataRequired()])
    contact_details = TextAreaField('Contact Details:', [validators.DataRequired()])
    surname = StringField('Surname:', [validators.DataRequired()])
    date_lent = DateField('Date Lent:', format='%Y-%m-%d' )
    submit = SubmitField('Save' )
    delete = SubmitField('Delete' )

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

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