from django.urls import reverse


def _tab(label: str, href: str, active: bool) -> dict:
    return {
        "label": label,
        "href": href,
        "active": bool(active),
    }


def settings_hierarchy_nav(request):
    match = getattr(request, "resolver_match", None)
    if match is None:
        return {}

    url_name = str(getattr(match, "url_name", "") or "")
    namespace = str(getattr(match, "namespace", "") or "")
    path = str(getattr(request, "path", "") or "")

    notifications_href = reverse("notifications_settings")
    system_href = reverse("system_settings")
    accessibility_href = reverse("accessibility_settings")
    encryption_href = reverse("encryption_settings")
    permissions_href = reverse("permission_settings")
    security_2fa_href = reverse("security_2fa")
    ai_models_href = reverse("ai_models")
    ai_traces_href = reverse("ai_execution_log")
    commands_href = reverse("command_routing")
    business_plans_href = reverse("business_plan_inbox")
    tasks_href = reverse("tasks_settings")
    translation_href = reverse("translation_settings")
    behavioral_href = reverse("behavioral_signals_settings")

    categories = {
        "general": {
            "routes": {
                "notifications_settings",
                "notifications_update",
                "system_settings",
                "accessibility_settings",
            },
            "title": "General",
            "tabs": [
                (
                    "Notifications",
                    notifications_href,
                    lambda: path == notifications_href,
                ),
                ("System", system_href, lambda: path == system_href),
                (
                    "Accessibility",
                    accessibility_href,
                    lambda: path == accessibility_href,
                ),
            ],
        },
        "security": {
            "routes": {
                "security_settings",
                "encryption_settings",
                "permission_settings",
                "security_2fa",
            },
            "title": "Security",
            "tabs": [
                ("Encryption", encryption_href, lambda: path == encryption_href),
                ("Permissions", permissions_href, lambda: path == permissions_href),
                (
                    "2FA",
                    security_2fa_href,
                    lambda: path == security_2fa_href or namespace == "two_factor",
                ),
            ],
        },
        "ai": {
            "routes": {
                "ai_settings",
                "ai_models",
                "ais",
                "ai_create",
                "ai_update",
                "ai_delete",
                "ai_execution_log",
            },
            "title": "AI",
            "tabs": [
                ("Models", ai_models_href, lambda: path == ai_models_href),
                ("Traces", ai_traces_href, lambda: path == ai_traces_href),
            ],
        },
        "modules": {
            "routes": {
                "modules_settings",
                "command_routing",
                "business_plan_inbox",
                "business_plan_editor",
                "tasks_settings",
                "translation_settings",
                "translation_preview",
                "availability_settings",
                "behavioral_signals_settings",
                "codex_settings",
                "codex_approval",
            },
            "title": "Modules",
            "tabs": [
                ("Commands", commands_href, lambda: path == commands_href),
                (
                    "Business Plans",
                    business_plans_href,
                    lambda: url_name in {"business_plan_inbox", "business_plan_editor"},
                ),
                ("Task Automation", tasks_href, lambda: path == tasks_href),
                (
                    "Translation",
                    translation_href,
                    lambda: url_name in {"translation_settings", "translation_preview"},
                ),
                (
                    "Behavioral Signals",
                    behavioral_href,
                    lambda: url_name
                    in {"availability_settings", "behavioral_signals_settings"},
                ),
            ],
        },
    }

    two_factor_security_routes = {
        "profile",
        "setup",
        "backup_tokens",
        "disable",
        "phone_create",
        "phone_delete",
    }

    if url_name in categories["general"]["routes"]:
        category = categories["general"]
    elif url_name in categories["security"]["routes"] or (
        namespace == "two_factor" and url_name in two_factor_security_routes
    ):
        category = categories["security"]
    elif url_name in categories["ai"]["routes"]:
        category = categories["ai"]
    elif url_name in categories["modules"]["routes"]:
        category = categories["modules"]
    else:
        category = None

    if category is None:
        settings_nav = None
    else:
        settings_nav = {
            "title": str(category.get("title") or "Settings"),
            "tabs": [
                _tab(label, href, bool(is_active()))
                for label, href, is_active in category.get("tabs", [])
            ],
        }

    if not settings_nav:
        return {}
    return {"settings_nav": settings_nav}