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use sqlx::sqlite::SqlitePool;

use super::repo::Provider as _;
use crate::{
    clock::DateTime,
    db,
    error::failed::{ErrorExt, Failed, ResultExt as _},
    event::Broadcaster,
    name::Name,
    password::Password,
    token::{Secret, Token, repo::Provider as _},
    user::{create, create::Create},
};

#[derive(Clone)]
pub struct Setup {
    db: SqlitePool,
    events: Broadcaster,
}

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

    pub async fn initial(
        &self,
        name: &Name,
        password: &Password,
        created_at: &DateTime,
    ) -> Result<Secret, Error> {
        let create = Create::begin(name, password, created_at);

        let validated = create.validate().map_err(|err| match err {
            create::Error::InvalidName(name) => Error::InvalidName(name),
            create::Error::Failed(_) => err.fail("Failed to validate new user"),
        })?;

        let mut tx = self.db.begin().await.fail(db::failed::BEGIN)?;
        if tx
            .setup()
            .completed()
            .await
            .fail("Failed to check for prior setup completion")?
        {
            Err(Error::SetupCompleted)
        } else {
            let stored = validated
                .store(&mut tx)
                .await
                .fail("Failed to create initial user")?;
            let login = stored.login();

            let (token, secret) = Token::generate(login, created_at);
            tx.tokens()
                .create(&token, &secret)
                .await
                .fail("Failed to create token")?;
            tx.commit().await.fail(db::failed::COMMIT)?;

            stored.publish(&self.events);

            Ok(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("invalid user name: {0}")]
    InvalidName(Name),
    #[error(transparent)]
    Failed(#[from] Failed),
}