from __future__ import annotations

from pathlib import Path
from uuid import uuid4

from flask import Blueprint, current_app, flash, jsonify, redirect, render_template, request, url_for
from flask_login import current_user, login_required
from werkzeug.utils import secure_filename

from ..extensions import csrf, db
from ..forms import SettingsProfileForm
from ..models import BadgeDefinition, PushSubscription
from ..services.notifications import push_enabled


bp = Blueprint("settings", __name__, url_prefix="/settings")


def _save_avatar(file_storage) -> str:
    filename = secure_filename(file_storage.filename or "")
    ext = Path(filename).suffix.lower() or ".png"
    relative_path = Path("avatars") / f"{uuid4().hex}{ext}"
    absolute_path = Path(current_app.config["UPLOAD_FOLDER"]) / relative_path
    absolute_path.parent.mkdir(parents=True, exist_ok=True)
    file_storage.save(absolute_path)
    return relative_path.as_posix()


@bp.route("", methods=["GET", "POST"])
@login_required
def index():
    form = SettingsProfileForm(original_email=current_user.email, obj=current_user)
    if form.validate_on_submit():
        current_user.name = form.name.data.strip()
        current_user.email = form.email.data.lower().strip()
        current_user.notification_task_due_enabled = form.notification_task_due_enabled.data
        current_user.notification_monthly_winner_enabled = form.notification_monthly_winner_enabled.data
        if form.password.data:
            current_user.set_password(form.password.data)
        if form.avatar.data:
            current_user.avatar_path = _save_avatar(form.avatar.data)
        db.session.commit()
        flash("Deine Einstellungen wurden gespeichert.", "success")
        return redirect(url_for("settings.index"))

    badges = BadgeDefinition.query.order_by(BadgeDefinition.name.asc()).all()
    subscriptions = PushSubscription.query.filter_by(user_id=current_user.id).all()
    return render_template(
        "settings/index.html",
        form=form,
        badges=badges,
        push_ready=push_enabled(),
        vapid_public_key=current_app.config["VAPID_PUBLIC_KEY"],
        has_subscription=bool(subscriptions),
    )


@bp.route("/badges/<int:badge_id>", methods=["POST"])
@login_required
def update_badge(badge_id: int):
    badge = BadgeDefinition.query.get_or_404(badge_id)
    badge.threshold = max(1, request.form.get("threshold", type=int, default=badge.threshold))
    badge.bonus_points = max(0, request.form.get("bonus_points", type=int, default=badge.bonus_points))
    badge.active = request.form.get("active") == "on"
    db.session.commit()
    flash(f"Badge „{badge.name}“ wurde aktualisiert.", "success")
    return redirect(url_for("settings.index"))


@bp.route("/push/subscribe", methods=["POST"])
@login_required
@csrf.exempt
def push_subscribe():
    if not push_enabled():
        return jsonify({"ok": False, "message": "VAPID ist nicht konfiguriert."}), 400

    data = request.get_json(silent=True) or {}
    endpoint = data.get("endpoint")
    keys = data.get("keys", {})
    if not endpoint or not keys.get("p256dh") or not keys.get("auth"):
        return jsonify({"ok": False, "message": "Subscription unvollständig."}), 400

    subscription = PushSubscription.query.filter_by(endpoint=endpoint).first()
    if not subscription:
        subscription = PushSubscription(user_id=current_user.id, endpoint=endpoint, p256dh=keys["p256dh"], auth=keys["auth"])
        db.session.add(subscription)
    else:
        subscription.user_id = current_user.id
        subscription.p256dh = keys["p256dh"]
        subscription.auth = keys["auth"]
    db.session.commit()
    return jsonify({"ok": True})


@bp.route("/push/unsubscribe", methods=["POST"])
@login_required
@csrf.exempt
def push_unsubscribe():
    data = request.get_json(silent=True) or {}
    endpoint = data.get("endpoint")
    if endpoint:
        subscription = PushSubscription.query.filter_by(endpoint=endpoint, user_id=current_user.id).first()
        if subscription:
            db.session.delete(subscription)
            db.session.commit()
    return jsonify({"ok": True})