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

################################################################################
# Class describing Series in the database, and via sqlalchemy, connected to the DB as well
################################################################################
class Series(db.Model):
    id = db.Column(db.Integer, db.Sequence('series_id_seq'), primary_key=True)
    title = db.Column(db.String(100), unique=False, nullable=False)
    num_books = db.Column(db.Integer, nullable=False)
    calcd_rating = db.Column(db.String(10), unique=False, nullable=False)
    note = db.Column(db.Text)

    def __repr__(self):
        return f"<id: {self.id}, title: {self.title}, num_books: {self.num_books}, calcd_rating: {self.calcd_rating}, note: {self.note}>"

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

################################################################################
# Helper class that defines a form for series, used to make html <form>, with field validation (via wtforms)
################################################################################
class SeriesForm(FlaskForm):
    id = HiddenField()
    title = StringField('Title:', [validators.DataRequired()])
    num_books = IntegerField('Number of Books:', [validators.DataRequired(), validators.NumberRange(min=1)])
    calcd_rating = StringField('Avg Rating:' )
    note = TextAreaField('Notes:')
    submit = SubmitField('Save' )
    delete = SubmitField('Delete' )

def CalcAvgRating(sid):
    with db.engine.connect() as conn:
        res=conn.exec_driver_sql( f"select round(avg(to_number(r.name, '99')),1) as rating from book b, rating r, series s, book_series_link bsl where s.id={sid} and s.id = bsl.series_id and bsl.book_id = b.id and b.rating = r.id and r.name ~ E'^\\\\d+$'" )
    for row in res:
        rating = row.rating
    return rating

def ListOfSeriesWithMissingBooks():
    from main import Book_Series_Link

    rows = Series.query.outerjoin(Book_Series_Link).add_columns(Series.id,Series.title,Series.num_books,Book_Series_Link.book_num).order_by(Series.id,Book_Series_Link.book_num).all()
    tmp=[]
    tots={}
    for row in rows:
        if row.id not in tots:
            tots[row.id]={ 'title': row.title, 'num_books': row.num_books, 'count': 0 }
        if row.book_num is None:
            continue
        else:
            tots[row.id]['count'] += 1
    for idx in tots:
        if tots[idx]['num_books'] > tots[idx]['count']:
            tmp.append( { 'id': idx, 'title': tots[idx]['title'] } )
    return tmp

################################################################################
# Routes for series data
#
# /seriess -> GET only -> prints out list of all seriess
################################################################################
@app.route("/seriess", methods=["GET"])
@login_required
def seriess():
    seriess = Series.query.all()
    return render_template("seriess.html", seriess=seriess, message=st.GetMessage(), alert=st.GetAlert())

################################################################################
# /series -> GET/POST -> creates a new series type and when created, takes you back to /seriess
################################################################################
@app.route("/series", methods=["GET", "POST"])
@login_required
def new_series():
    form = SeriesForm(request.form)
    page_title='Create new Series'
    if 'title' not in request.form:
        return render_template("series.html", form=form, page_title=page_title, message=st.GetMessage(), alert=st.GetAlert() )
    else:
        series = Series( title=request.form["title"], num_books=request.form["num_books"], note=request.form["note"], calcd_rating=0 )
        try:
            db.session.add(series)
            db.session.commit()
            st.SetMessage( f"Created new Series (id={series.id})" )
            return redirect( '/seriess' )
        except SQLAlchemyError as e:
            st.SetAlert( "danger" )
            st.SetMessage( f"<b>Failed to add Series:</b>&nbsp;{e.orig}" )
            return render_template("series.html", form=form, page_title=page_title, alert=st.GetAlert(), message=st.GetMessage() )

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

################################################################################
# /series/rating_reset -> forces a reset of calculated ratings of all series
################################################################################
@app.route("/seriess/rating_reset", methods=["GET"])
@login_required
def reset_all_series_ratings():
    s_list = Series.query.all()
    try:
        for s in s_list:
           s.calcd_rating = CalcAvgRating(s.id)
        db.session.commit()
        st.SetMessage("Successfully reset calculated average ratings for all series");
        return render_template("base.html", message=st.GetMessage(), alert=st.GetAlert() )
    except:
        st.SetAlert("danger")
        st.SetMessage("Failed to reset calculated average rating for all series");
        return render_template("base.html", message=st.GetMessage(), alert=st.GetAlert() )

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