use sqlx::sqlite::SqlitePool;

use super::repo::auth::Provider as _;
use crate::{
    clock::DateTime,
    error::BoxedError,
    password::StoredHash,
    repo::{
        login::{Login, Provider as _},
        token::Provider as _,
    },
};

pub struct Logins<'a> {
    db: &'a SqlitePool,
}

impl<'a> Logins<'a> {
    pub const fn new(db: &'a SqlitePool) -> Self {
        Self { db }
    }

    pub async fn login(
        &self,
        name: &str,
        password: &str,
        login_at: DateTime,
    ) -> Result<Option<String>, BoxedError> {
        let mut tx = self.db.begin().await?;

        let login = if let Some((login, stored_hash)) = tx.auth().for_name(name).await? {
            if stored_hash.verify(password)? {
                // Password verified; use the login.
                Some(login)
            } else {
                // Password NOT verified.
                None
            }
        } else {
            let password_hash = StoredHash::new(password)?;
            Some(tx.logins().create(name, &password_hash).await?)
        };

        // If `login` is Some, then we have an identity and can issue a token.
        // If `login` is None, then neither creating a new login nor
        // authenticating an existing one succeeded, and we must reject the
        // login attempt.
        let token = if let Some(login) = login {
            Some(tx.tokens().issue(&login, login_at).await?)
        } else {
            None
        };

        tx.commit().await?;

        Ok(token)
    }

    pub async fn validate(
        &self,
        secret: &str,
        used_at: DateTime,
    ) -> Result<Option<Login>, BoxedError> {
        let mut tx = self.db.begin().await?;
        tx.tokens().expire(used_at).await?;
        let login = tx.tokens().validate(secret, used_at).await?;
        tx.commit().await?;

        Ok(login)
    }

    pub async fn logout(&self, secret: &str) -> Result<(), BoxedError> {
        let mut tx = self.db.begin().await?;
        tx.tokens().revoke(secret).await?;
        tx.commit().await?;

        Ok(())
    }
}