from wtforms import SubmitField, StringField, HiddenField, SelectField, validators
from flask import request, render_template, redirect
from flask_wtf import FlaskForm
from flask_login import login_required, current_user
from main import db, app, ma
from sqlalchemy import Sequence
from sqlalchemy.exc import SQLAlchemyError
from status import st, Status

################################################################################
# Class describing Covertype in the database, and via sqlalchemy, connected to the DB as well
################################################################################
class Covertype(db.Model):
    id = db.Column(db.Integer, db.Sequence('covertype_id_seq'), primary_key=True )
    name = db.Column(db.String(50), unique=True, nullable=False)

    def __repr__(self):
        return f"<id: {self.id}, name: {self.name}>"

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

################################################################################
# Helper class that defines a form for covertype, used to make html <form>, with field validation (via wtforms)
################################################################################
class CovertypeForm(FlaskForm):
    id = HiddenField()
    name = StringField('Name:', [validators.DataRequired()])
    submit = SubmitField('Save' )
    delete = SubmitField('Delete' )

################################################################################
# Routes for covertype data
#
# /covertypes -> GET only -> prints out list of all covertypes
################################################################################
@app.route("/covertypes", methods=["GET"])
@login_required
def covertypes():
    objects = Covertype.query.order_by('id').all()
    return render_template("show_id_name.html", objects=objects, page_title='Show All Covertypes', url_base='covertype', alert=st.GetAlert(), message=st.GetMessage() )

################################################################################
# /covertype -> GET/POST -> creates a new covertype type and when created, takes you back to /covertypes
################################################################################
@app.route("/covertype", methods=["GET", "POST"])
@login_required
def new_covertype():
    form = CovertypeForm(request.form)
    page_title='Create new Covertype'
    if 'name' not in request.form:
        return render_template("edit_id_name.html", form=form, page_title=page_title )
    else:
        covertype = Covertype( name=request.form["name"] )
        try:
            db.session.add(covertype)
            db.session.commit()
            st.SetMessage( f"Created new Covertype (id={covertype.id})" )
            return redirect( '/covertypes' )
        except SQLAlchemyError as e:
            st.SetAlert( "danger" )
            st.SetMessage( f"<b>Failed to add covertype:</b>&nbsp;{e.orig}" )
            return render_template("edit_id_name.html", form=form, page_title=page_title, alert=st.GetAlert(), message=st.GetMessage() )
            

################################################################################
# /covertype/<id> -> GET/POST(save or delete) -> shows/edits/delets a single covertype
################################################################################
@app.route("/covertype/<id>", methods=["GET", "POST"])
@login_required
def covertype(id):
    ### DDP: should this be request.form or request.values?
    form = CovertypeForm(request.form)
    page_title='Edit Covertype'
    if request.method == 'POST' and form.validate():
        try:
            covertype = Covertype.query.get(id)
            if 'delete' in request.form:
                st.SetMessage( f"Successfully deleted (id={covertype.id}, name={covertype.name})" )
                covertype = Covertype.query.filter(Covertype.id==id).delete()
            if 'submit' in request.form:
                st.SetMessage( f"Successfully Updated Covertype (id={id})" )
                covertype.name = request.form['name']
            db.session.commit()
            return redirect( '/covertypes' )
        except SQLAlchemyError as e:
            st.SetAlert( "danger" )
            st.SetMessage( f"<b>Failed to modify Covertype:</b>&nbsp;{e.orig}" )
            return render_template("edit_id_name.html", form=form, page_title=page_title, alert=st.GetAlert(), message=st.GetMessage() )
    else:
        covertype = Covertype.query.get(id)
        form = CovertypeForm(request.values, obj=covertype)
    return render_template("edit_id_name.html", form=form, page_title=page_title )

################################################################################
# Gets the Covertype matching id from DB, helper func in jinja2 code to show books
################################################################################
def GetCovertypeById(id):
    return Covertype.query.get(id).name