"""Meals blueprint — dashboard, responses, history."""

from datetime import date, datetime, timedelta

from flask import (
    Blueprint,
    render_template,
    request,
    redirect,
    url_for,
    session,
    flash,
)

from werkzeug.security import check_password_hash

from models import (
    get_dashboard_data,
    upsert_response,
    ensure_meal_periods,
    get_user_by_id,
    delete_user,
    delete_household,
    count_household_users,
    set_user_ntfy,
    get_user_ntfy,
    get_user_by_callback_token,
    set_household_timezone,
    get_household_by_id,
)
from i18n import t
from ntfy import send_test_notification

meals_bp = Blueprint("meals", __name__)


def login_required(f):
    """Decorator: redirect to login if not authenticated or session is stale."""
    from functools import wraps

    @wraps(f)
    def wrapper(*args, **kwargs):
        if "user_id" not in session or "household_id" not in session:
            session.clear()
            return redirect(url_for("auth.login"))
        return f(*args, **kwargs)

    return wrapper


@meals_bp.route("/")
def index():
    if "user_id" in session:
        return redirect(url_for("meals.dashboard"))
    return redirect(url_for("auth.login"))


@meals_bp.route("/dashboard")
@login_required
def dashboard():
    today = date.today()
    household_id = session["household_id"]

    # Allow viewing other dates via query param
    date_str = request.args.get("date")
    if date_str:
        try:
            today = datetime.strptime(date_str, "%Y-%m-%d").date()
        except ValueError:
            flash(t("Invalid date format. Use YYYY-MM-DD."), "error")

    if household_id is None:
        session.clear()
        return redirect(url_for("auth.login"))

    data = get_dashboard_data(today, household_id)
    ntfy = get_user_ntfy(session["user_id"])
    household = get_household_by_id(household_id)
    return render_template(
        "dashboard.html",
        dashboard=data,
        viewing_date=today,
        today=date.today(),
        prev_date=today - timedelta(days=1),
        next_date=today + timedelta(days=1),
        current_user_id=session["user_id"],
        is_admin=session["is_admin"],
        ntfy=ntfy,
        household=household,
    )


@meals_bp.route("/respond", methods=["POST"])
@login_required
def respond():
    meal_type = request.form.get("meal_type", "").strip()
    status = request.form.get("status", "").strip()
    date_str = request.form.get("date", date.today().isoformat())

    if meal_type not in ("lunch", "dinner"):
        flash(t("Invalid meal type."), "error")
        return redirect(url_for("meals.dashboard"))

    if status not in ("yes", "no"):
        flash(t("Invalid status."), "error")
        return redirect(url_for("meals.dashboard"))

    try:
        target_date = datetime.strptime(date_str, "%Y-%m-%d").date()
    except ValueError:
        flash(t("Invalid date."), "error")
        return redirect(url_for("meals.dashboard"))

    if target_date < date.today():
        flash(t("Cannot change responses for past dates."), "error")
        return redirect(url_for("meals.dashboard"))

    periods = ensure_meal_periods(target_date)
    period = next((p for p in periods if p["meal_type"] == meal_type), None)
    if period is None:
        flash(t("Meal period not found."), "error")
        return redirect(url_for("meals.dashboard"))

    upsert_response(session["user_id"], period["id"], status)
    return redirect(url_for("meals.dashboard"))


@meals_bp.route("/history")
@login_required
def history():
    date_str = request.args.get("date", date.today().isoformat())
    try:
        target_date = datetime.strptime(date_str, "%Y-%m-%d").date()
    except ValueError:
        target_date = date.today()

    data = get_dashboard_data(target_date, session["household_id"])
    ntfy = get_user_ntfy(session["user_id"])
    household = get_household_by_id(session["household_id"])
    return render_template(
        "dashboard.html",
        dashboard=data,
        viewing_date=target_date,
        today=date.today(),
        prev_date=target_date - timedelta(days=1),
        next_date=target_date + timedelta(days=1),
        current_user_id=session["user_id"],
        is_admin=session["is_admin"],
        history_mode=True,
        ntfy=ntfy,
        household=household,
    )


# ── Account / household management ────────────────────────────────────────────

@meals_bp.route("/delete-account", methods=["POST"])
@login_required
def delete_account():
    """Delete the currently logged-in user's own account."""
    password = request.form.get("password", "")
    user = get_user_by_id(session["user_id"])

    if not check_password_hash(user["password_hash"], password):
        flash(t("Incorrect password. Account not deleted."), "error")
        return redirect(url_for("meals.dashboard"))

    household_id = session["household_id"]
    is_admin = session["is_admin"]
    user_count = count_household_users(household_id)

    # If admin is the last user, delete the household too
    if is_admin and user_count == 1:
        delete_household(household_id)
        flash(t("Your account and household have been deleted."), "success")
    else:
        delete_user(session["user_id"])
        flash(t("Your account has been deleted."), "success")

    # Clear auth keys but keep the session so flash survives the redirect
    for key in ("user_id", "username", "is_admin", "household_id", "household_name"):
        session.pop(key, None)
    return redirect(url_for("auth.login"))


@meals_bp.route("/admin/remove-user/<int:user_id>", methods=["POST"])
@login_required
def admin_remove_user(user_id):
    """Admin removes a user from the household."""
    if not session["is_admin"]:
        flash(t("Only admins can remove users."), "error")
        return redirect(url_for("meals.dashboard"))

    user = get_user_by_id(user_id)
    if user is None or user["household_id"] != session["household_id"]:
        flash(t("User not found in your household."), "error")
        return redirect(url_for("meals.dashboard"))

    if user["is_admin"]:
        flash(t("Cannot remove the admin. Transfer admin role first or delete the household."), "error")
        return redirect(url_for("meals.dashboard"))

    delete_user(user_id)
    flash(t("User '{name}' has been removed.", name=user["username"]), "success")
    return redirect(url_for("meals.dashboard"))


@meals_bp.route("/admin/delete-household", methods=["POST"])
@login_required
def admin_delete_household():
    """Admin deletes the entire household."""
    if not session["is_admin"]:
        flash(t("Only admins can delete the household."), "error")
        return redirect(url_for("meals.dashboard"))

    password = request.form.get("password", "")
    user = get_user_by_id(session["user_id"])

    if not check_password_hash(user["password_hash"], password):
        flash(t("Incorrect password. Household not deleted."), "error")
        return redirect(url_for("meals.dashboard"))

    delete_household(session["household_id"])
    flash(t("Household and all members have been deleted."), "success")
    for key in ("user_id", "username", "is_admin", "household_id", "household_name"):
        session.pop(key, None)
    return redirect(url_for("auth.login"))


@meals_bp.route("/admin/timezone", methods=["POST"])
@login_required
def admin_set_timezone():
    """Admin sets the household timezone."""
    if not session["is_admin"]:
        flash(t("Only admins can change the timezone."), "error")
        return redirect(url_for("meals.dashboard"))

    timezone = request.form.get("timezone", "").strip()
    if not timezone:
        flash(t("Please select a timezone."), "error")
        return redirect(url_for("meals.dashboard"))

    set_household_timezone(session["household_id"], timezone)
    flash(t("Timezone updated."), "success")
    return redirect(url_for("meals.dashboard"))


# ── Ntfy integration ─────────────────────────────────────────────────────────

@meals_bp.route("/ntfy-settings", methods=["POST"])
@login_required
def ntfy_settings():
    """Save ntfy URL and token for the current user."""
    import secrets

    ntfy_url = request.form.get("ntfy_url", "").strip()
    ntfy_token = request.form.get("ntfy_token", "").strip()

    existing = get_user_ntfy(session["user_id"])
    callback_token = existing.get("callback_token") if existing else ""

    # Generate a new callback token if user is enabling ntfy for the first time
    if ntfy_url and not callback_token:
        callback_token = secrets.token_urlsafe(32)

    # If clearing ntfy, also clear the callback token
    if not ntfy_url:
        callback_token = ""
        ntfy_token = ""

    set_user_ntfy(session["user_id"], ntfy_url, ntfy_token, callback_token)
    flash(t("Ntfy settings saved."), "success")
    return redirect(url_for("meals.dashboard"))


@meals_bp.route("/ntfy-test", methods=["POST"])
@login_required
def ntfy_test():
    """Send a test ntfy notification to verify the configuration."""
    ntfy_url = request.form.get("ntfy_url", "").strip()
    ntfy_token = request.form.get("ntfy_token", "").strip()

    if not ntfy_url:
        flash(t("Please enter an ntfy URL first."), "error")
        return redirect(url_for("meals.dashboard"))

    ok = send_test_notification(ntfy_url, ntfy_token)
    if ok:
        flash(t("Test notification sent! Check your device."), "success")
    else:
        flash(t("Failed to send test notification. Check your ntfy URL and token."), "error")
    return redirect(url_for("meals.dashboard"))


@meals_bp.route("/api/ntfy-callback", methods=["POST"])
def ntfy_callback():
    """Receive ntfy action callbacks (no login — authenticated via callback_token).

    Expects JSON body: {"token": "...", "meal_type": "lunch|dinner",
                        "date": "YYYY-MM-DD", "status": "yes|no"}
    """
    data = request.get_json(silent=True)
    if not data:
        return {"error": "Invalid JSON"}, 400

    token = data.get("token", "")
    meal_type = data.get("meal_type", "")
    date_str = data.get("date", "")
    status = data.get("status", "")

    user = get_user_by_callback_token(token)
    if user is None:
        return {"error": "Invalid token"}, 403

    if meal_type not in ("lunch", "dinner"):
        return {"error": "Invalid meal_type"}, 400
    if status not in ("yes", "no"):
        return {"error": "Invalid status"}, 400

    try:
        target_date = datetime.strptime(date_str, "%Y-%m-%d").date()
    except (ValueError, TypeError):
        return {"error": "Invalid date"}, 400

    if target_date < date.today():
        return {"error": "Cannot change past meals"}, 400

    periods = ensure_meal_periods(target_date)
    period = next((p for p in periods if p["meal_type"] == meal_type), None)
    if period is None:
        return {"error": "Meal period not found"}, 400

    upsert_response(user["id"], period["id"], status)
    return {"message": "Response recorded", "status": status}, 200