#[derive(Debug, thiserror::Error, serde::Serialize, serde::Deserialize)]
pub enum Error {
    #[error("Can't create index")]
    CantCreate,
    #[error("Failed to find records in bucket")]
    QueryFailed,
}

pub type Result<T> = std::result::Result<T, Error>;

pub mod search {
    use crate::search::Error;

    #[derive(Debug, serde::Serialize, serde::Deserialize)]
    pub struct Input {
        pub query: String,
        pub collection: String,
        pub lang: String,
    }

    #[derive(Debug, Default, serde::Serialize, serde::Deserialize)]
    pub struct Output {
        pub found: Option<Vec<String>>,
        pub error: Option<Error>,
    }

    impl Output {
        pub fn found(found: Vec<String>) -> Self {
            Self {
                found: Some(found),
                ..Default::default()
            }
        }

        pub fn error(error: Error) -> Self {
            Self {
                error: Some(error),
                ..Default::default()
            }
        }
    }
}

pub mod create_index {
    use crate::search::Error;

    #[derive(Debug, serde::Serialize, serde::Deserialize)]
    pub struct Input {
        pub key: String,
        pub value: String,
        pub collection: String,
        pub lang: String,
    }

    #[derive(Debug, Default, serde::Serialize, serde::Deserialize)]
    pub struct Output {
        pub found: Option<()>,
        pub error: Option<Error>,
    }

    impl Output {
        pub fn ok() -> Self {
            Self {
                found: Some(()),
                ..Default::default()
            }
        }

        pub fn error(error: Error) -> Self {
            Self {
                error: Some(error),
                ..Default::default()
            }
        }
    }
}

pub mod rpc {
    use config::SharedAppConfig;

    use crate::search::{create_index, search};

    #[tarpc::service]
    pub trait Search {
        /// Search all matching indices.
        async fn search(input: search::Input) -> search::Output;

        /// Create new search index.
        async fn create_index(input: create_index::Input) -> create_index::Output;
    }

    pub async fn create_client(config: SharedAppConfig) -> SearchClient {
        use tarpc::client;
        use tarpc::tokio_serde::formats::Bincode;

        let l = config.lock();
        let transport =
            tarpc::serde_transport::tcp::connect(l.search().rpc_addr(), Bincode::default);

        let client = SearchClient::new(
            client::Config::default(),
            transport.await.expect("Failed to connect to search server"),
        )
        .spawn();

        client
    }
}