from typing import Optional

from flask import Blueprint, Response, flash, redirect, render_template, url_for
from flask.typing import ResponseReturnValue

from app.extensions import db
from app.models.bridges import Bridge
from app.portal.util import LifecycleForm

bp = Blueprint("bridge", __name__)

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


@bp.route("/list")
def bridge_list() -> ResponseReturnValue:
    bridges = Bridge.query.filter(Bridge.destroyed.is_(None)).all()
    return render_template(
        "list.html.j2",
        title="Tor Bridges",
        item="bridge",
        items=bridges,
        **_SECTION_TEMPLATE_VARS,
    )


@bp.route("/block/<bridge_id>", methods=["GET", "POST"])
def bridge_blocked(bridge_id: int) -> ResponseReturnValue:
    bridge: Optional[Bridge] = Bridge.query.filter(
        Bridge.id == bridge_id, Bridge.destroyed.is_(None)
    ).first()
    if bridge is None:
        return Response(
            render_template(
                "error.html.j2",
                header="404 Proxy Not Found",
                message="The requested bridge could not be found.",
                **_SECTION_TEMPLATE_VARS,
            )
        )
    form = LifecycleForm()
    if form.validate_on_submit():
        bridge.deprecate(reason="manual")
        db.session.commit()
        flash("Bridge will be shortly replaced.", "success")
        return redirect(
            url_for("portal.bridgeconf.bridgeconf_edit", bridgeconf_id=bridge.conf_id)
        )
    return render_template(
        "lifecycle.html.j2",
        header=f"Mark bridge {bridge.hashed_fingerprint} as blocked?",
        message=bridge.hashed_fingerprint,
        form=form,
        **_SECTION_TEMPLATE_VARS,
    )


@bp.route("/expire/<bridge_id>", methods=["GET", "POST"])
def bridge_expire(bridge_id: int) -> ResponseReturnValue:
    bridge: Optional[Bridge] = Bridge.query.filter(
        Bridge.id == bridge_id, Bridge.destroyed.is_(None)
    ).first()
    if bridge is None:
        return Response(
            render_template(
                "error.html.j2",
                header="404 Proxy Not Found",
                message="The requested bridge could not be found.",
                **_SECTION_TEMPLATE_VARS,
            )
        )
    form = LifecycleForm()
    if form.validate_on_submit():
        bridge.destroy()
        db.session.commit()
        flash("Bridge will be shortly destroyed.", "success")
        return redirect(
            url_for("portal.bridgeconf.bridgeconf_edit", bridgeconf_id=bridge.conf_id)
        )
    return render_template(
        "lifecycle.html.j2",
        header=f"Destroy bridge {bridge.hashed_fingerprint}?",
        message=bridge.hashed_fingerprint,
        form=form,
        **_SECTION_TEMPLATE_VARS,
    )