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use std::path::PathBuf;

use clap::Subcommand;

use crate::{config::StorageConfiguration, Error, Storage};

/// Commands operating on local database storage.
#[derive(Subcommand, Debug)]
pub enum StorageCommand {
    /// Back up the storage.
    #[clap(subcommand)]
    Backup(Location),
    /// Restore the storage from backup.
    #[clap(subcommand)]
    Restore(Location),
}

/// A backup location.
#[derive(Subcommand, Debug)]
pub enum Location {
    /// A filesystem-based backup location.
    Path {
        /// The path to the backup directory.
        path: PathBuf,
    },
}

impl StorageCommand {
    /// Executes the command after opening a [`Storage`] instance using `config`.
    pub async fn execute(&self, config: StorageConfiguration) -> Result<(), Error> {
        let storage = Storage::open(config).await?;
        self.execute_on(&storage).await
    }

    /// Executes the command on `storage`.
    pub async fn execute_on(&self, storage: &Storage) -> Result<(), Error> {
        match self {
            StorageCommand::Backup(location) => location.backup(storage).await,
            StorageCommand::Restore(location) => location.restore(storage).await,
        }
    }
}

impl Location {
    /// Backs-up `storage` to `self`.
    pub async fn backup(&self, storage: &Storage) -> Result<(), Error> {
        match self {
            Location::Path { path } => storage.backup(path.as_path()).await,
        }
    }

    /// Restores `storage` from `self`.
    pub async fn restore(&self, storage: &Storage) -> Result<(), Error> {
        match self {
            Location::Path { path } => storage.restore(path.as_path()).await,
        }
    }
}