use sqlx::sqlite::SqlitePool;

use super::repo::Provider as _;
use crate::{
    clock::DateTime,
    event::{repo::Provider as _, Broadcaster, Event},
    login::{repo::Provider as _, Login, Password},
    token::{repo::Provider as _, Secret},
};

pub struct Setup<'a> {
    db: &'a SqlitePool,
    events: &'a Broadcaster,
}

impl<'a> Setup<'a> {
    pub const fn new(db: &'a SqlitePool, events: &'a Broadcaster) -> Self {
        Self { db, events }
    }

    pub async fn initial(
        &self,
        name: &str,
        password: &Password,
        created_at: &DateTime,
    ) -> Result<(Login, Secret), Error> {
        let password_hash = password.hash()?;

        let mut tx = self.db.begin().await?;
        let login = if tx.setup().completed().await? {
            Err(Error::SetupCompleted)?
        } else {
            let created = tx.sequence().next(created_at).await?;
            tx.logins().create(name, &password_hash, &created).await?
        };
        let secret = tx.tokens().issue(&login, created_at).await?;
        tx.commit().await?;

        self.events
            .broadcast(login.events().map(Event::from).collect::<Vec<_>>());

        Ok((login.as_created(), secret))
    }

    pub async fn completed(&self) -> Result<bool, sqlx::Error> {
        let mut tx = self.db.begin().await?;
        let completed = tx.setup().completed().await?;
        tx.commit().await?;

        Ok(completed)
    }
}

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("initial setup previously completed")]
    SetupCompleted,
    #[error(transparent)]
    Database(#[from] sqlx::Error),
    #[error(transparent)]
    PasswordHash(#[from] password_hash::Error),
}