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//! Storage: abstracts activities storage (file, memory...)
use crate::rtw_core::activity::{Activity, OngoingActivity};
use crate::rtw_core::ActivityId;
use std::error::Error;
pub trait Storage {
// see anyhow::Error type constraints
type StorageError: Error + Sync + Send + 'static;
/// Write finished activity
///
/// May fail depending on backend implementation
fn write_activity(&mut self, activity: Activity) -> Result<(), Self::StorageError>;
/// Filter finished activities
///
/// May fail depending on implementation
///
/// Returns finished activities sorted by start date
///
/// ActivityId: 0 <=> last finished activity
fn filter_activities<P>(&self, p: P) -> Result<Vec<(ActivityId, Activity)>, Self::StorageError>
where
P: Fn(&(ActivityId, Activity)) -> bool;
/// Get all finished activities
///
/// May fail depending on implementation
///
/// Returns finished activities sorted by start date
///
/// ActivityId: 0 <=> last finished activity
fn get_finished_activities(&self) -> Result<Vec<(ActivityId, Activity)>, Self::StorageError>;
/// Delete activity with id
///
/// May fail depending on implementation
///
/// Returns deleted activity if successful
fn delete_activity(&self, id: ActivityId) -> Result<Option<Activity>, Self::StorageError>;
/// Retrieve current activity if any
///
/// May fail depending on backend implementation
fn get_current_activity(&self) -> Result<Option<OngoingActivity>, Self::StorageError>;
/// Set `activity` as current activity
///
/// May fail depending on backend implementation
fn set_current_activity(&mut self, activity: OngoingActivity)
-> Result<(), Self::StorageError>;
/// Reset current activity to none
///
/// After calling this function, get_current_activity should return None
fn reset_current_activity(&mut self) -> Result<Option<OngoingActivity>, Self::StorageError>;
}