// Copyright 2025 RisingWave Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! [`SystemConfig`] is used to initialize [system parameters](crate::system_param) persisted in Meta store.

use super::*;

macro_rules! define_system_config {
    ($({ $field:ident, $type:ty, $default:expr, $is_mutable:expr, $doc:literal, $($rest:tt)* },)*) => {
        paste::paste!(
            /// The section `[system]` in `risingwave.toml`. All these fields are used to initialize the [system
            /// parameters](crate::system_param) persisted in Meta store. Most fields are for testing purpose only and should not be
            /// documented.
            #[serde_with::apply(Option => #[serde(with = "none_as_empty_string")])]
            #[derive(Clone, Debug, Serialize, Deserialize, DefaultFromSerde, ConfigDoc)]
            pub struct SystemConfig {
                $(
                    #[doc = $doc]
                    #[serde(default = "default::system::" $field "_opt")]
                    pub $field: Option<$type>,
                )*
            }
        );
    };
}

for_all_params!(define_system_config);

impl SystemConfig {
    #[expect(deprecated)]
    pub fn into_init_system_params(self) -> SystemParams {
        macro_rules! fields {
            ($({ $field:ident, $($rest:tt)* },)*) => {
                SystemParams {
                    $($field: self.$field.map(Into::into),)*
                    ..Default::default() // deprecated fields
                }
            };
        }

        let mut system_params = for_all_params!(fields);

        // Initialize backup_storage_url and backup_storage_directory if not set.
        if let Some(state_store) = &system_params.state_store
            && let Some(data_directory) = &system_params.data_directory
        {
            if system_params.backup_storage_url.is_none() {
                if let Some(hummock_state_store) = state_store.strip_prefix("hummock+") {
                    system_params.backup_storage_url = Some(hummock_state_store.to_owned());
                } else {
                    system_params.backup_storage_url = Some("memory".to_owned());
                }
                tracing::info!("initialize backup_storage_url based on state_store");
            }
            if system_params.backup_storage_directory.is_none() {
                system_params.backup_storage_directory = Some(format!("{data_directory}/backup"));
                tracing::info!("initialize backup_storage_directory based on data_directory");
            }
        }
        system_params
    }
}

pub mod default {
    pub use crate::system_param::default as system;
}
