from datetime import datetime

from flask import render_template, url_for, flash, redirect, Response, Blueprint
from flask.typing import ResponseReturnValue
from flask_wtf import FlaskForm
import sqlalchemy
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired

from app.extensions import db
from app.models.base import Pool

bp = Blueprint("pool", __name__)


class NewPoolForm(FlaskForm):  # type: ignore
    group_name = StringField("Short Name", validators=[DataRequired()])
    description = StringField("Description", validators=[DataRequired()])
    submit = SubmitField('Save Changes', render_kw={"class": "btn btn-success"})


class EditPoolForm(FlaskForm):  # type: ignore
    description = StringField("Description", validators=[DataRequired()])
    submit = SubmitField('Save Changes', render_kw={"class": "btn btn-success"})


@bp.route("/list")
def pool_list() -> ResponseReturnValue:
    pools = Pool.query.order_by(Pool.pool_name).all()
    return render_template("list.html.j2",
                           section="pool",
                           title="Resource Pools",
                           item="pool",
                           items=pools,
                           new_link=url_for("portal.pool.pool_new"))


@bp.route("/new", methods=['GET', 'POST'])
def pool_new() -> ResponseReturnValue:
    form = NewPoolForm()
    if form.validate_on_submit():
        pool = Pool()
        pool.pool_name = form.group_name.data
        pool.description = form.description.data
        pool.created = datetime.utcnow()
        pool.updated = datetime.utcnow()
        try:
            db.session.add(pool)
            db.session.commit()
            flash(f"Created new pool {pool.pool_name}.", "success")
            return redirect(url_for("portal.pool.pool_edit", pool_id=pool.id))
        except sqlalchemy.exc.SQLAlchemyError:
            flash("Failed to create new pool.", "danger")
            return redirect(url_for("portal.pool.pool_list"))
    return render_template("new.html.j2", section="pool", form=form)


@bp.route('/edit/<pool_id>', methods=['GET', 'POST'])
def pool_edit(pool_id: int) -> ResponseReturnValue:
    pool = Pool.query.filter(Pool.id == pool_id).first()
    if pool is None:
        return Response(render_template("error.html.j2",
                                        section="pool",
                                        header="404 Pool Not Found",
                                        message="The requested pool could not be found."),
                        status=404)
    form = EditPoolForm(description=pool.description)
    if form.validate_on_submit():
        pool.description = form.description.data
        pool.updated = datetime.utcnow()
        try:
            db.session.commit()
            flash("Saved changes to pool.", "success")
        except sqlalchemy.exc.SQLAlchemyError:
            flash("An error occurred saving the changes to the pool.", "danger")
    return render_template("pool.html.j2",
                           section="pool",
                           pool=pool, form=form)