"""
MCLogger – Site-Admin-Bereich
Verwaltet alle Gruppen und Nutzer global.
"""
from functools import wraps
from flask import Blueprint, render_template, request, redirect, url_for, session, flash
import panel_db as db

site_admin = Blueprint("site_admin", __name__, url_prefix="/admin")


def admin_required(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        if not session.get("is_site_admin"):
            return redirect(url_for("auth.admin_login"))
        return f(*args, **kwargs)
    return decorated


# ──────────────────────────────────────────────────────────────
# Dashboard
# ──────────────────────────────────────────────────────────────

@site_admin.route("/")
@admin_required
def dashboard():
    groups = db.list_all_groups()
    users  = db.list_all_users()
    for g in groups:
        g["has_db"] = db.has_db_configured(g["id"])
    stats = {
        "group_count":   len(groups),
        "user_count":    len(users),
        "db_configured": sum(1 for g in groups if g["has_db"]),
        "admin_count":   sum(1 for u in users if u.get("is_site_admin")),
    }
    return render_template("admin/dashboard.html", groups=groups, users=users, stats=stats)


# ──────────────────────────────────────────────────────────────
# Gruppen verwalten
# ──────────────────────────────────────────────────────────────

@site_admin.route("/groups")
@admin_required
def groups():
    all_groups = db.list_all_groups()
    for g in all_groups:
        g["has_db"] = db.has_db_configured(g["id"])
    return render_template("admin/groups.html", groups=all_groups)


@site_admin.route("/groups/new", methods=["GET", "POST"])
@admin_required
def group_new():
    if request.method == "POST":
        name = request.form.get("name", "").strip()
        desc = request.form.get("description", "").strip()
        if not name:
            flash("Gruppenname darf nicht leer sein.", "danger")
        elif db.get_group_by_name(name):
            flash("Eine Gruppe mit diesem Namen existiert bereits.", "danger")
        else:
            db.create_group(name, desc)
            flash(f"Gruppe '{name}' erstellt.", "success")
            return redirect(url_for("site_admin.groups"))
    return render_template("admin/group_edit.html", group=None)


@site_admin.route("/groups/<int:group_id>/edit", methods=["GET", "POST"])
@admin_required
def group_edit(group_id):
    group = db.get_group_by_id(group_id)
    if not group:
        flash("Gruppe nicht gefunden.", "danger")
        return redirect(url_for("site_admin.groups"))
    if request.method == "POST":
        name = request.form.get("name", "").strip()
        desc = request.form.get("description", "").strip()
        if not name:
            flash("Gruppenname darf nicht leer sein.", "danger")
        else:
            db.update_group(group_id, name, desc)
            flash("Gruppe aktualisiert.", "success")
            return redirect(url_for("site_admin.groups"))
    return render_template("admin/group_edit.html", group=group)


@site_admin.route("/groups/<int:group_id>/delete", methods=["POST"])
@admin_required
def group_delete(group_id):
    db.delete_group(group_id)
    flash("Gruppe gelöscht.", "success")
    return redirect(url_for("site_admin.groups"))


@site_admin.route("/groups/<int:group_id>/members")
@admin_required
def group_members(group_id):
    group   = db.get_group_by_id(group_id)
    members = db.get_group_members(group_id)
    all_users = db.list_all_users()
    member_ids = {m["id"] for m in members}
    non_members = [u for u in all_users if u["id"] not in member_ids]
    return render_template("admin/group_members.html",
        group=group, members=members, non_members=non_members)


@site_admin.route("/groups/<int:group_id>/members/add", methods=["POST"])
@admin_required
def group_member_add(group_id):
    user_id = request.form.get("user_id", type=int)
    role    = request.form.get("role", "member")
    if user_id:
        db.add_group_member(user_id, group_id, role)
        flash("Mitglied hinzugefügt.", "success")
    return redirect(url_for("site_admin.group_members", group_id=group_id))


@site_admin.route("/groups/<int:group_id>/members/<int:user_id>/remove", methods=["POST"])
@admin_required
def group_member_remove(group_id, user_id):
    db.remove_group_member(user_id, group_id)
    flash("Mitglied entfernt.", "success")
    return redirect(url_for("site_admin.group_members", group_id=group_id))


# ──────────────────────────────────────────────────────────────
# Nutzer verwalten
# ──────────────────────────────────────────────────────────────

@site_admin.route("/users")
@admin_required
def users():
    return render_template("admin/users.html", users=db.list_all_users())


@site_admin.route("/users/new", methods=["GET", "POST"])
@admin_required
def user_new():
    if request.method == "POST":
        username      = request.form.get("username", "").strip()
        email         = request.form.get("email", "").strip()
        password      = request.form.get("password", "")
        is_site_admin = request.form.get("is_site_admin") == "1"
        if not username or not email or not password:
            flash("Alle Felder sind Pflichtfelder.", "danger")
        elif db.get_user_by_username(username):
            flash("Benutzername bereits vergeben.", "danger")
        else:
            db.create_user(username, email, password, is_site_admin)
            flash(f"Nutzer '{username}' erstellt.", "success")
            return redirect(url_for("site_admin.users"))
    return render_template("admin/user_edit.html", user=None)


@site_admin.route("/users/<int:user_id>/edit", methods=["GET", "POST"])
@admin_required
def user_edit(user_id):
    user = db.get_user_by_id(user_id)
    if not user:
        flash("Nutzer nicht gefunden.", "danger")
        return redirect(url_for("site_admin.users"))
    if request.method == "POST":
        username      = request.form.get("username", "").strip()
        email         = request.form.get("email", "").strip()
        is_site_admin = request.form.get("is_site_admin") == "1"
        new_password  = request.form.get("new_password", "")
        db.update_user(user_id, username, email, is_site_admin)
        if new_password:
            db.change_password(user_id, new_password)
            flash("Passwort geändert.", "info")
        flash("Nutzer aktualisiert.", "success")
        return redirect(url_for("site_admin.users"))
    return render_template("admin/user_edit.html", user=user)


@site_admin.route("/users/<int:user_id>/delete", methods=["POST"])
@admin_required
def user_delete(user_id):
    if user_id == session.get("user_id"):
        flash("Du kannst dich nicht selbst löschen.", "danger")
    else:
        db.delete_user(user_id)
        flash("Nutzer gelöscht.", "success")
    return redirect(url_for("site_admin.users"))


# ──────────────────────────────────────────────────────────────
# Als Gruppe anzeigen (Site-Admin liest Gruppen-DB)
# ──────────────────────────────────────────────────────────────

@site_admin.route("/view-group/<int:group_id>")
@admin_required
def view_group(group_id):
    """Site-Admin wechselt temporär in eine Grup­pe, um deren MC-Daten zu sehen."""
    group = db.get_group_by_id(group_id)
    if not group:
        flash("Gruppe nicht gefunden.", "danger")
        return redirect(url_for("site_admin.dashboard"))
    if not db.has_db_configured(group_id):
        flash("Für diese Gruppe ist noch keine Datenbank konfiguriert.", "warning")
        return redirect(url_for("site_admin.dashboard"))
    # Alle Berechtigungen als Admin
    all_perms = {k: True for k in ["view_dashboard","view_players","view_sessions",
                                    "view_chat","view_commands","view_deaths","view_blocks",
                                    "view_proxy","view_server_events","view_perms"]}
    session["group_id"]      = group_id
    session["group_name"]    = group["name"]
    session["role"]          = "admin"
    session["permissions"]   = all_perms
    session["admin_viewing"] = True
    return redirect(url_for("panel.dashboard"))


@site_admin.route("/stop-view")
@admin_required
def stop_view():
    """Kehrt zum Site-Admin-Dashboard zurück."""
    session.pop("group_id", None)
    session.pop("group_name", None)
    session.pop("role", None)
    session.pop("permissions", None)
    session.pop("admin_viewing", None)
    return redirect(url_for("site_admin.dashboard"))