#include "smartbotic/webserver/group_service.hpp"

#include <spdlog/spdlog.h>

#include <chrono>
#include <functional>
#include <iomanip>
#include <sstream>
#include <unordered_set>

namespace smartbotic::webserver {

namespace {

auto SetStringValue(::smartbotic::database::MapValue* map, const std::string& key, const std::string& value) {
    auto* field = &(*map->mutable_fields())[key];
    field->set_string_value(value);
}

auto SetArrayValue(::smartbotic::database::MapValue* map, const std::string& key, const std::vector<std::string>& values) {
    auto* field = &(*map->mutable_fields())[key];
    auto* array = field->mutable_array_value();
    for (const auto& value : values) {
        array->add_values()->set_string_value(value);
    }
}

auto GetStringValue(const ::smartbotic::database::MapValue& map, const std::string& key) -> std::string {
    auto it = map.fields().find(key);
    if (it != map.fields().end() && it->second.has_string_value()) {
        return it->second.string_value();
    }
    return "";
}

auto GetArrayValue(const ::smartbotic::database::MapValue& map, const std::string& key) -> std::vector<std::string> {
    std::vector<std::string> result;
    auto it = map.fields().find(key);
    if (it != map.fields().end() && it->second.has_array_value()) {
        for (const auto& value : it->second.array_value().values()) {
            if (value.has_string_value()) {
                result.push_back(value.string_value());
            }
        }
    }
    return result;
}

auto GetBoolValue(const ::smartbotic::database::MapValue& map, const std::string& key) -> bool {
    auto it = map.fields().find(key);
    if (it != map.fields().end() && it->second.has_bool_value()) {
        return it->second.bool_value();
    }
    return false;
}

auto SetBoolValue(::smartbotic::database::MapValue* map, const std::string& key, bool value) {
    auto* field = &(*map->mutable_fields())[key];
    field->set_bool_value(value);
}

}  // namespace

GroupService::GroupService(DatabaseClient& db_client) : db_client_(db_client) {}

GroupService::~GroupService() = default;

// Move operations not supported due to reference member
GroupService::GroupService(GroupService&& other) noexcept
    : db_client_(other.db_client_), initialized_(other.initialized_) {}

auto GroupService::operator=(GroupService&& /*other*/) noexcept -> GroupService& {
    // Cannot reassign reference member, so this is essentially a no-op
    return *this;
}

auto GroupService::Initialize() -> bool {
    if (initialized_) {
        return true;
    }

    auto* collection_service = db_client_.GetCollectionService();
    if (collection_service == nullptr) {
        spdlog::error("Collection service not available");
        return false;
    }

    // Check if _groups collection exists
    ::smartbotic::database::GetCollectionMetadataRequest get_req;
    get_req.set_name(kCollectionName);

    grpc::ClientContext get_ctx;
    ::smartbotic::database::CollectionMetadata metadata;
    auto status = collection_service->GetCollectionMetadata(&get_ctx, get_req, &metadata);

    if (status.ok()) {
        spdlog::info("System collection {} already exists", kCollectionName);
    } else {
        // Collection doesn't exist, create it
        ::smartbotic::database::CreateCollectionRequest create_req;
        create_req.set_name(kCollectionName);

        // Add compound index on workspace_id + name for uniqueness within workspace
        auto* name_index = create_req.add_indexes();
        name_index->set_collection(kCollectionName);
        name_index->set_index_name("workspace_name_unique");
        name_index->add_fields("workspace_id");
        name_index->add_fields("name");
        name_index->set_unique(true);
        name_index->set_type(::smartbotic::database::INDEX_TYPE_HASH);

        grpc::ClientContext create_ctx;
        ::smartbotic::database::CollectionMetadata created_metadata;
        status = collection_service->CreateCollection(&create_ctx, create_req, &created_metadata);

        if (!status.ok()) {
            spdlog::error("Failed to create {} collection: {}", kCollectionName, status.error_message());
            return false;
        }

        spdlog::info("Created system collection {}", kCollectionName);
    }

    // Ensure superadmin group exists
    auto superadmin_result = GetGroupByName("", kSuperadminGroupName, true);
    if (!superadmin_result.success) {
        if (!CreateSuperadminGroup()) {
            spdlog::error("Failed to create superadmin group");
            return false;
        }
    } else {
        spdlog::info("Global superadmin group already exists");
    }

    initialized_ = true;
    return true;
}

auto GroupService::CreateSuperadminGroup() -> bool {
    return CreateSystemGroup(kSuperadminGroupName, {"*"});
}

auto GroupService::CreateSystemGroup(const std::string& name, const std::vector<std::string>& permissions) -> bool {
    auto* doc_service = db_client_.GetDocumentService();
    if (doc_service == nullptr) {
        return false;
    }

    // Check if group already exists
    auto existing = GetGroupByName("", name, true);
    if (existing.success) {
        spdlog::info("System group {} already exists", name);
        return true;
    }

    ::smartbotic::database::CreateDocumentRequest create_req;
    create_req.set_collection(kCollectionName);

    auto* data = create_req.mutable_data();
    SetStringValue(data, "workspace_id", "");  // Global group
    SetStringValue(data, "name", name);
    SetArrayValue(data, "permissions", permissions);
    SetBoolValue(data, "is_system", true);  // Mark as system group
    SetStringValue(data, "parent_group_id", "");
    SetStringValue(data, "created_at", GetCurrentTimestamp());
    SetStringValue(data, "updated_at", GetCurrentTimestamp());
    SetStringValue(data, "deleted_at", "");
    SetStringValue(data, "created_by", "");  // System-created
    SetStringValue(data, "updated_by", "");

    grpc::ClientContext ctx;
    ::smartbotic::database::Document created_doc;
    auto status = doc_service->CreateDocument(&ctx, create_req, &created_doc);

    if (!status.ok()) {
        spdlog::error("Failed to create system group {}: {}", name, status.error_message());
        return false;
    }

    spdlog::info("Created system group {} with ID {}", name, created_doc.id());
    return true;
}

auto GroupService::CreateGroup(const CreateGroupRequest& request) -> GroupResult {
    if (!initialized_) {
        return GroupResult{.success = false, .error = "Group service not initialized", .group = std::nullopt};
    }

    // Validate request
    if (request.name.empty()) {
        return GroupResult{.success = false, .error = "Name is required", .group = std::nullopt};
    }

    if (request.workspace_id.empty()) {
        return GroupResult{.success = false, .error = "Workspace ID is required for non-global groups", .group = std::nullopt};
    }

    // Prevent creating groups with reserved names
    if (request.name == kSuperadminGroupName) {
        return GroupResult{.success = false, .error = "Cannot create group with reserved name", .group = std::nullopt};
    }

    // Check if name already exists in workspace
    if (NameExistsInWorkspace(request.workspace_id, request.name)) {
        return GroupResult{.success = false, .error = "Group name already exists in workspace", .group = std::nullopt};
    }

    // Validate parent group if specified
    if (!request.parent_group_id.empty()) {
        auto parent_result = GetGroup(request.parent_group_id, false);
        if (!parent_result.success) {
            return GroupResult{.success = false, .error = "Parent group not found", .group = std::nullopt};
        }
    }

    // Create the document
    auto* doc_service = db_client_.GetDocumentService();
    if (doc_service == nullptr) {
        return GroupResult{.success = false, .error = "Document service not available", .group = std::nullopt};
    }

    ::smartbotic::database::CreateDocumentRequest create_req;
    create_req.set_collection(kCollectionName);

    auto* data = create_req.mutable_data();
    SetStringValue(data, "workspace_id", request.workspace_id);
    SetStringValue(data, "name", request.name);
    SetArrayValue(data, "permissions", request.permissions);
    SetBoolValue(data, "is_system", request.is_system);
    SetStringValue(data, "parent_group_id", request.parent_group_id);
    SetStringValue(data, "created_at", GetCurrentTimestamp());
    SetStringValue(data, "updated_at", GetCurrentTimestamp());
    SetStringValue(data, "deleted_at", "");
    SetStringValue(data, "created_by", request.actor_id);
    SetStringValue(data, "updated_by", request.actor_id);

    grpc::ClientContext ctx;
    ::smartbotic::database::Document created_doc;
    auto status = doc_service->CreateDocument(&ctx, create_req, &created_doc);

    if (!status.ok()) {
        spdlog::error("Failed to create group: {}", status.error_message());
        return GroupResult{.success = false, .error = status.error_message(), .group = std::nullopt};
    }

    spdlog::info("Created group {} with name {} in workspace {}", created_doc.id(), request.name, request.workspace_id);
    return GroupResult{.success = true, .error = "", .group = DocumentToGroup(created_doc)};
}

auto GroupService::GetGroup(const std::string& id, bool include_deleted) -> GroupResult {
    if (!initialized_) {
        return GroupResult{.success = false, .error = "Group service not initialized", .group = std::nullopt};
    }

    auto* doc_service = db_client_.GetDocumentService();
    if (doc_service == nullptr) {
        return GroupResult{.success = false, .error = "Document service not available", .group = std::nullopt};
    }

    ::smartbotic::database::GetDocumentRequest get_req;
    get_req.set_collection(kCollectionName);
    get_req.set_id(id);

    grpc::ClientContext ctx;
    ::smartbotic::database::Document doc;
    auto status = doc_service->GetDocument(&ctx, get_req, &doc);

    if (!status.ok()) {
        if (status.error_code() == grpc::StatusCode::NOT_FOUND) {
            return GroupResult{.success = false, .error = "Group not found", .group = std::nullopt};
        }
        return GroupResult{.success = false, .error = status.error_message(), .group = std::nullopt};
    }

    auto group = DocumentToGroup(doc);
    if (!include_deleted && group.IsDeleted()) {
        return GroupResult{.success = false, .error = "Group not found", .group = std::nullopt};
    }

    return GroupResult{.success = true, .error = "", .group = group};
}

auto GroupService::GetGroupByName(const std::string& workspace_id, const std::string& name, bool include_deleted) -> GroupResult {
    if (!initialized_ && name != kSuperadminGroupName) {
        return GroupResult{.success = false, .error = "Group service not initialized", .group = std::nullopt};
    }

    auto* query_service = db_client_.GetQueryService();
    if (query_service == nullptr) {
        return GroupResult{.success = false, .error = "Query service not available", .group = std::nullopt};
    }

    ::smartbotic::database::QueryRequest query_req;
    query_req.set_collection(kCollectionName);
    query_req.set_limit(1);

    // Build compound filter: workspace_id AND name
    auto* filter = query_req.mutable_filter();
    auto* composite = filter->mutable_composite();
    composite->set_operator_(::smartbotic::database::COMPOSITE_OPERATOR_AND);

    auto* ws_filter = composite->add_filters()->mutable_field();
    ws_filter->set_field("workspace_id");
    ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
    ws_filter->mutable_value()->set_string_value(workspace_id);

    auto* name_filter = composite->add_filters()->mutable_field();
    name_filter->set_field("name");
    name_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
    name_filter->mutable_value()->set_string_value(name);

    grpc::ClientContext ctx;
    ::smartbotic::database::QueryResponse response;
    auto status = query_service->Query(&ctx, query_req, &response);

    if (!status.ok()) {
        return GroupResult{.success = false, .error = status.error_message(), .group = std::nullopt};
    }

    if (response.documents().empty()) {
        return GroupResult{.success = false, .error = "Group not found", .group = std::nullopt};
    }

    auto group = DocumentToGroup(response.documents(0));
    if (!include_deleted && group.IsDeleted()) {
        return GroupResult{.success = false, .error = "Group not found", .group = std::nullopt};
    }

    return GroupResult{.success = true, .error = "", .group = group};
}

auto GroupService::ListGroups(const std::string& workspace_id, int limit, int offset, bool include_deleted) -> GroupListResult {
    if (!initialized_) {
        return GroupListResult{.success = false, .error = "Group service not initialized", .groups = {}, .total_count = 0};
    }

    auto* query_service = db_client_.GetQueryService();
    if (query_service == nullptr) {
        return GroupListResult{.success = false, .error = "Query service not available", .groups = {}, .total_count = 0};
    }

    ::smartbotic::database::QueryRequest query_req;
    query_req.set_collection(kCollectionName);
    query_req.set_limit(limit);
    query_req.set_offset(offset);

    // Build filter for workspace
    auto* filter = query_req.mutable_filter();

    if (!include_deleted) {
        // Filter: workspace_id = X AND deleted_at = ""
        auto* composite = filter->mutable_composite();
        composite->set_operator_(::smartbotic::database::COMPOSITE_OPERATOR_AND);

        auto* ws_filter = composite->add_filters()->mutable_field();
        ws_filter->set_field("workspace_id");
        ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        ws_filter->mutable_value()->set_string_value(workspace_id);

        auto* del_filter = composite->add_filters()->mutable_field();
        del_filter->set_field("deleted_at");
        del_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        del_filter->mutable_value()->set_string_value("");
    } else {
        // Filter: workspace_id = X
        auto* ws_filter = filter->mutable_field();
        ws_filter->set_field("workspace_id");
        ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        ws_filter->mutable_value()->set_string_value(workspace_id);
    }

    // Order by name ascending
    auto* order = query_req.add_order_by();
    order->set_field("name");
    order->set_direction(::smartbotic::database::SORT_DIRECTION_ASCENDING);

    grpc::ClientContext ctx;
    ::smartbotic::database::QueryResponse response;
    auto status = query_service->Query(&ctx, query_req, &response);

    if (!status.ok()) {
        return GroupListResult{.success = false, .error = status.error_message(), .groups = {}, .total_count = 0};
    }

    GroupListResult result;
    result.success = true;
    result.total_count = response.total_count();

    for (const auto& doc : response.documents()) {
        result.groups.push_back(DocumentToGroup(doc));
    }

    return result;
}

auto GroupService::ListGroupsByIds(const std::vector<std::string>& group_ids, bool include_deleted) -> GroupListResult {
    if (!initialized_) {
        return GroupListResult{.success = false, .error = "Group service not initialized", .groups = {}, .total_count = 0};
    }

    if (group_ids.empty()) {
        return GroupListResult{.success = true, .error = "", .groups = {}, .total_count = 0};
    }

    // Fetch each group by ID
    GroupListResult result;
    result.success = true;

    for (const auto& id : group_ids) {
        auto grp_result = GetGroup(id, include_deleted);
        if (grp_result.success && grp_result.group) {
            result.groups.push_back(*grp_result.group);
        }
    }

    result.total_count = static_cast<int64_t>(result.groups.size());
    return result;
}

auto GroupService::UpdateGroup(const std::string& id, const UpdateGroupRequest& request) -> GroupResult {
    if (!initialized_) {
        return GroupResult{.success = false, .error = "Group service not initialized", .group = std::nullopt};
    }

    // First get the existing group
    auto existing = GetGroup(id, false);
    if (!existing.success) {
        return existing;
    }

    // Cannot modify superadmin group
    if (existing.group->name == kSuperadminGroupName && existing.group->IsGlobal()) {
        return GroupResult{.success = false, .error = "Cannot modify superadmin group", .group = std::nullopt};
    }

    // Check if name is being updated and if it already exists
    if (request.name && *request.name != existing.group->name) {
        if (*request.name == kSuperadminGroupName) {
            return GroupResult{.success = false, .error = "Cannot use reserved name", .group = std::nullopt};
        }
        if (NameExistsInWorkspace(existing.group->workspace_id, *request.name)) {
            return GroupResult{.success = false, .error = "Group name already exists in workspace", .group = std::nullopt};
        }
    }

    auto* doc_service = db_client_.GetDocumentService();
    if (doc_service == nullptr) {
        return GroupResult{.success = false, .error = "Document service not available", .group = std::nullopt};
    }

    ::smartbotic::database::UpdateDocumentRequest update_req;
    update_req.set_collection(kCollectionName);
    update_req.set_id(id);
    update_req.set_merge(true);  // Merge with existing data

    auto* data = update_req.mutable_data();

    if (request.name) {
        SetStringValue(data, "name", *request.name);
    }
    if (request.permissions) {
        SetArrayValue(data, "permissions", *request.permissions);
    }
    if (request.parent_group_id) {
        // Validate parent group if specified
        if (!request.parent_group_id->empty()) {
            auto parent_result = GetGroup(*request.parent_group_id, false);
            if (!parent_result.success) {
                return GroupResult{.success = false, .error = "Parent group not found", .group = std::nullopt};
            }
            // Prevent circular references
            if (*request.parent_group_id == id) {
                return GroupResult{.success = false, .error = "Group cannot be its own parent", .group = std::nullopt};
            }
        }
        SetStringValue(data, "parent_group_id", *request.parent_group_id);
    }

    SetStringValue(data, "updated_at", GetCurrentTimestamp());
    if (!request.actor_id.empty()) {
        SetStringValue(data, "updated_by", request.actor_id);
    }

    grpc::ClientContext ctx;
    ::smartbotic::database::Document updated_doc;
    auto status = doc_service->UpdateDocument(&ctx, update_req, &updated_doc);

    if (!status.ok()) {
        return GroupResult{.success = false, .error = status.error_message(), .group = std::nullopt};
    }

    spdlog::info("Updated group {}", id);
    return GroupResult{.success = true, .error = "", .group = DocumentToGroup(updated_doc)};
}

auto GroupService::DeleteGroup(const std::string& id) -> GroupResult {
    if (!initialized_) {
        return GroupResult{.success = false, .error = "Group service not initialized", .group = std::nullopt};
    }

    // First get the existing group
    auto existing = GetGroup(id, false);
    if (!existing.success) {
        return existing;
    }

    // Cannot delete superadmin group
    if (existing.group->name == kSuperadminGroupName && existing.group->IsGlobal()) {
        return GroupResult{.success = false, .error = "Cannot delete superadmin group", .group = std::nullopt};
    }

    auto* doc_service = db_client_.GetDocumentService();
    if (doc_service == nullptr) {
        return GroupResult{.success = false, .error = "Document service not available", .group = std::nullopt};
    }

    // Soft delete by setting deleted_at
    ::smartbotic::database::UpdateDocumentRequest update_req;
    update_req.set_collection(kCollectionName);
    update_req.set_id(id);
    update_req.set_merge(true);

    auto* data = update_req.mutable_data();
    SetStringValue(data, "deleted_at", GetCurrentTimestamp());
    SetStringValue(data, "updated_at", GetCurrentTimestamp());

    grpc::ClientContext ctx;
    ::smartbotic::database::Document updated_doc;
    auto status = doc_service->UpdateDocument(&ctx, update_req, &updated_doc);

    if (!status.ok()) {
        return GroupResult{.success = false, .error = status.error_message(), .group = std::nullopt};
    }

    spdlog::info("Soft deleted group {}", id);
    return GroupResult{.success = true, .error = "", .group = DocumentToGroup(updated_doc)};
}

auto GroupService::NameExistsInWorkspace(const std::string& workspace_id, const std::string& name) -> bool {
    auto result = GetGroupByName(workspace_id, name, true);
    return result.success;
}

auto GroupService::GetSuperadminGroup() -> GroupResult {
    return GetGroupByName("", kSuperadminGroupName, false);
}

auto GroupService::DocumentToGroup(const ::smartbotic::database::Document& doc) -> Group {
    Group group;
    group.id = doc.id();
    group.workspace_id = GetStringValue(doc.data(), "workspace_id");
    group.name = GetStringValue(doc.data(), "name");
    group.permissions = GetArrayValue(doc.data(), "permissions");
    group.is_system = GetBoolValue(doc.data(), "is_system");
    group.parent_group_id = GetStringValue(doc.data(), "parent_group_id");
    group.created_at = GetStringValue(doc.data(), "created_at");
    group.updated_at = GetStringValue(doc.data(), "updated_at");
    group.deleted_at = GetStringValue(doc.data(), "deleted_at");
    group.created_by = GetStringValue(doc.data(), "created_by");
    group.updated_by = GetStringValue(doc.data(), "updated_by");
    return group;
}

auto GroupService::ListSystemGroups(bool include_deleted) -> GroupListResult {
    if (!initialized_) {
        return GroupListResult{.success = false, .error = "Group service not initialized", .groups = {}, .total_count = 0};
    }

    auto* query_service = db_client_.GetQueryService();
    if (query_service == nullptr) {
        return GroupListResult{.success = false, .error = "Query service not available", .groups = {}, .total_count = 0};
    }

    ::smartbotic::database::QueryRequest query_req;
    query_req.set_collection(kCollectionName);
    query_req.set_limit(100);

    // Build filter: workspace_id = "" AND is_system = true
    auto* filter = query_req.mutable_filter();
    auto* composite = filter->mutable_composite();
    composite->set_operator_(::smartbotic::database::COMPOSITE_OPERATOR_AND);

    auto* ws_filter = composite->add_filters()->mutable_field();
    ws_filter->set_field("workspace_id");
    ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
    ws_filter->mutable_value()->set_string_value("");

    auto* sys_filter = composite->add_filters()->mutable_field();
    sys_filter->set_field("is_system");
    sys_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
    sys_filter->mutable_value()->set_bool_value(true);

    if (!include_deleted) {
        auto* del_filter = composite->add_filters()->mutable_field();
        del_filter->set_field("deleted_at");
        del_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        del_filter->mutable_value()->set_string_value("");
    }

    // Order by name ascending
    auto* order = query_req.add_order_by();
    order->set_field("name");
    order->set_direction(::smartbotic::database::SORT_DIRECTION_ASCENDING);

    grpc::ClientContext ctx;
    ::smartbotic::database::QueryResponse response;
    auto status = query_service->Query(&ctx, query_req, &response);

    if (!status.ok()) {
        return GroupListResult{.success = false, .error = status.error_message(), .groups = {}, .total_count = 0};
    }

    GroupListResult result;
    result.success = true;
    result.total_count = response.total_count();

    for (const auto& doc : response.documents()) {
        result.groups.push_back(DocumentToGroup(doc));
    }

    return result;
}

auto GroupService::ListGlobalGroups(bool include_deleted) -> GroupListResult {
    if (!initialized_) {
        return GroupListResult{.success = false, .error = "Group service not initialized", .groups = {}, .total_count = 0};
    }

    auto* query_service = db_client_.GetQueryService();
    if (query_service == nullptr) {
        return GroupListResult{.success = false, .error = "Query service not available", .groups = {}, .total_count = 0};
    }

    ::smartbotic::database::QueryRequest query_req;
    query_req.set_collection(kCollectionName);
    query_req.set_limit(100);

    // Build filter: workspace_id = ""
    auto* filter = query_req.mutable_filter();

    if (!include_deleted) {
        auto* composite = filter->mutable_composite();
        composite->set_operator_(::smartbotic::database::COMPOSITE_OPERATOR_AND);

        auto* ws_filter = composite->add_filters()->mutable_field();
        ws_filter->set_field("workspace_id");
        ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        ws_filter->mutable_value()->set_string_value("");

        auto* del_filter = composite->add_filters()->mutable_field();
        del_filter->set_field("deleted_at");
        del_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        del_filter->mutable_value()->set_string_value("");
    } else {
        auto* ws_filter = filter->mutable_field();
        ws_filter->set_field("workspace_id");
        ws_filter->set_operator_(::smartbotic::database::FILTER_OPERATOR_EQUAL);
        ws_filter->mutable_value()->set_string_value("");
    }

    // Order by name ascending
    auto* order = query_req.add_order_by();
    order->set_field("name");
    order->set_direction(::smartbotic::database::SORT_DIRECTION_ASCENDING);

    grpc::ClientContext ctx;
    ::smartbotic::database::QueryResponse response;
    auto status = query_service->Query(&ctx, query_req, &response);

    if (!status.ok()) {
        return GroupListResult{.success = false, .error = status.error_message(), .groups = {}, .total_count = 0};
    }

    GroupListResult result;
    result.success = true;
    result.total_count = response.total_count();

    for (const auto& doc : response.documents()) {
        result.groups.push_back(DocumentToGroup(doc));
    }

    return result;
}

auto GroupService::GetEffectivePermissions(const std::string& group_id) -> std::vector<std::string> {
    std::vector<std::string> permissions;
    std::unordered_set<std::string> visited;  // Prevent infinite loops

    std::function<void(const std::string&)> collect_permissions = [&](const std::string& id) {
        if (id.empty() || visited.contains(id)) {
            return;
        }
        visited.insert(id);

        auto result = GetGroup(id, false);
        if (!result.success || !result.group) {
            return;
        }

        // Add this group's permissions
        for (const auto& perm : result.group->permissions) {
            permissions.push_back(perm);
        }

        // Recursively get parent's permissions
        if (!result.group->parent_group_id.empty()) {
            collect_permissions(result.group->parent_group_id);
        }
    };

    collect_permissions(group_id);
    return permissions;
}

auto GroupService::GetCurrentTimestamp() -> std::string {
    auto now = std::chrono::system_clock::now();
    auto time = std::chrono::system_clock::to_time_t(now);
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;

    std::ostringstream oss;
    oss << std::put_time(std::gmtime(&time), "%Y-%m-%dT%H:%M:%S");
    oss << '.' << std::setfill('0') << std::setw(3) << ms.count() << 'Z';
    return oss.str();
}

}  // namespace smartbotic::webserver