use std::error::Error;

use async_trait::async_trait;

use crate::{
    event::{Event, EventDeletion},
    person::Person,
    stats::Stats,
};

/// Data storage adaptor, all methods on an adaptor can return an error if
/// something goes wrong, or potentially None if the data requested was not found.
#[async_trait]
pub trait Adaptor: Send + Sync {
    type Error: Error;

    async fn get_stats(&self) -> Result<Stats, Self::Error>;
    async fn increment_stat_event_count(&self) -> Result<i32, Self::Error>;
    async fn increment_stat_person_count(&self) -> Result<i32, Self::Error>;

    async fn get_people(&self, event_id: String) -> Result<Option<Vec<Person>>, Self::Error>;
    async fn upsert_person(&self, event_id: String, person: Person) -> Result<Person, Self::Error>;

    async fn get_event(&self, id: String) -> Result<Option<Event>, Self::Error>;
    async fn create_event(&self, event: Event) -> Result<Event, Self::Error>;

    /// Delete an event as well as all related people
    async fn delete_event(&self, id: String) -> Result<EventDeletion, Self::Error>;
}