from datetime import datetime
from typing import Optional

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

from app.extensions import db
from app.models.activity import Webhook
from app.portal.util import response_404, view_lifecycle

bp = Blueprint("webhook", __name__)


@bp.app_template_filter("webhook_format_name")
def webhook_format_name(s: str) -> str:
    if s == "telegram":
        return "Telegram"
    if s == "matrix":
        return "Matrix"
    return "Unknown"


class NewWebhookForm(FlaskForm):  # type: ignore
    description = StringField('Description', validators=[DataRequired()])
    format = SelectField('Format', choices=[
        ("telegram", "Telegram"),
        ("matrix", "Matrix")
    ], validators=[DataRequired()])
    url = StringField('URL', validators=[DataRequired()])
    submit = SubmitField('Save Changes')


@bp.route("/new", methods=['GET', 'POST'])
def webhook_new() -> ResponseReturnValue:
    form = NewWebhookForm()
    if form.validate_on_submit():
        webhook = Webhook(
            description=form.description.data,
            format=form.format.data,
            url=form.url.data
        )
        try:
            db.session.add(webhook)
            db.session.commit()
            flash(f"Created new webhook {webhook.url}.", "success")
            return redirect(url_for("portal.webhook.webhook_edit", webhook_id=webhook.id))
        except exc.SQLAlchemyError as e:
            flash("Failed to create new webhook.", "danger")
            return redirect(url_for("portal.webhook.webhook_list"))
    return render_template("new.html.j2", section="webhook", form=form)


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


@bp.route("/list")
def webhook_list() -> ResponseReturnValue:
    webhooks = Webhook.query.all()
    return render_template("list.html.j2",
                           section="webhook",
                           title="Webhooks",
                           item="webhook",
                           new_link=url_for("portal.webhook.webhook_new"),
                           items=webhooks)


@bp.route("/destroy/<webhook_id>", methods=['GET', 'POST'])
def webhook_destroy(webhook_id: int) -> ResponseReturnValue:
    webhook: Optional[Webhook] = Webhook.query.filter(Webhook.id == webhook_id, Webhook.destroyed == None).first()
    if webhook is None:
        return response_404("The requested webhook could not be found.")
    return view_lifecycle(
        header=f"Destroy webhook {webhook.url}",
        message=webhook.description,
        success_message="Webhook destroyed.",
        success_view="portal.webhook.webhook_list",
        section="webhook",
        resource=webhook,
        action="destroy"
    )