from datetime import datetime, timezone
from typing import Optional

from flask import Blueprint, Response, current_app, flash, render_template
from flask.typing import ResponseReturnValue
from flask_wtf import FlaskForm
from sqlalchemy import desc, exc
from wtforms import BooleanField, SubmitField

from app.extensions import db
from app.models.automation import Automation, AutomationLogs
from app.models.tfstate import TerraformState
from app.portal.util import response_404, view_lifecycle

bp = Blueprint("automation", __name__)


_SECTION_TEMPLATE_VARS = {
    "section": "automation",
    "help_url": "https://bypass.censorship.guide/user/automation.html"
}


class EditAutomationForm(FlaskForm):  # type: ignore
    enabled = BooleanField('Enabled')
    submit = SubmitField('Save Changes')


@bp.route("/list")
def automation_list() -> ResponseReturnValue:
    automations = list(filter(
        lambda a: a.short_name not in current_app.config.get('HIDDEN_AUTOMATIONS', []),
        Automation.query.filter(
            Automation.destroyed.is_(None)).order_by(Automation.description).all()
    ))
    states = {tfs.key: tfs for tfs in TerraformState.query.all()}
    return render_template("list.html.j2",
                           title="Automation Jobs",
                           item="automation",
                           items=automations,
                           states=states,
                           **_SECTION_TEMPLATE_VARS)


@bp.route('/edit/<automation_id>', methods=['GET', 'POST'])
def automation_edit(automation_id: int) -> ResponseReturnValue:
    automation: Optional[Automation] = Automation.query.filter(Automation.id == automation_id).first()
    if automation is None:
        return Response(render_template("error.html.j2",
                                        header="404 Automation Job Not Found",
                                        message="The requested automation job could not be found.",
                                        **_SECTION_TEMPLATE_VARS),
                        status=404)
    form = EditAutomationForm(enabled=automation.enabled)
    if form.validate_on_submit():
        automation.enabled = form.enabled.data
        automation.updated = datetime.now(tz=timezone.utc)
        try:
            db.session.commit()
            flash("Saved changes to bridge configuration.", "success")
        except exc.SQLAlchemyError:
            flash("An error occurred saving the changes to the bridge configuration.", "danger")
    logs = AutomationLogs.query.filter(AutomationLogs.automation_id == automation.id).order_by(
        desc(AutomationLogs.added)).limit(5).all()
    return render_template("automation.html.j2",
                           automation=automation,
                           logs=logs,
                           form=form,
                           **_SECTION_TEMPLATE_VARS)


@bp.route("/kick/<automation_id>", methods=['GET', 'POST'])
def automation_kick(automation_id: int) -> ResponseReturnValue:
    automation = Automation.query.filter(
        Automation.id == automation_id,
        Automation.destroyed.is_(None)).first()
    if automation is None:
        return response_404("The requested bridge configuration could not be found.")
    return view_lifecycle(
        header="Kick automation timer?",
        message=automation.description,
        section="automation",
        success_view="portal.automation.automation_list",
        success_message="This automation job will next run within 1 minute.",
        resource=automation,
        action="kick"
    )