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use argon2::{Argon2, PasswordHash, PasswordVerifier};
use axum::{
    async_trait,
    extract::{FromRequestParts, State},
    http::request::Parts,
    RequestPartsExt,
};
use axum_extra::{
    headers::{authorization::Basic, Authorization},
    TypedHeader,
};
use uuid::Uuid;

use crate::state::AppState;

use self::{error::Error, jwt::JWT};

pub use self::claims::{AccessClaims, RefreshClaims};

pub mod claims;
pub mod credentials;
pub mod error;
pub mod jwt;

pub fn router() -> axum::Router<AppState> {
    use axum::routing::get;

    axum::Router::new()
        .route("/issue", get(issue))
        .route("/refresh", get(refresh))
        .merge(credentials::router())
}

pub async fn issue(
    State(state): State<AppState>,
    Account { id, password }: Account,
) -> Result<(AccessClaims, RefreshClaims), Error> {
    let p: String = sqlx::query_scalar!("SELECT password_hash FROM credential WHERE id = $1", id)
        .fetch_optional(&state.pool)
        .await?
        .ok_or(Error::LoginInvalid)?;

    Argon2::default().verify_password(password.as_bytes(), &PasswordHash::new(&p)?)?;

    let refresh = RefreshClaims::issue(id);
    let access = refresh.refresh();
    Ok((access, refresh))
}

pub async fn refresh(claims: RefreshClaims) -> AccessClaims {
    claims.refresh()
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Account {
    pub id: Uuid,
    pub password: String,
}

#[async_trait]
impl FromRequestParts<AppState> for Account {
    type Rejection = Error;

    async fn from_request_parts(parts: &mut Parts, _: &AppState) -> Result<Self, Self::Rejection> {
        let TypedHeader(Authorization(basic)) =
            parts.extract::<TypedHeader<Authorization<Basic>>>().await?;

        Ok(Self {
            id: Uuid::try_parse(basic.username())?,
            password: basic.password().to_string(),
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    use axum::{
        body::Body,
        http::{header::AUTHORIZATION, Request, StatusCode},
        Router,
    };
    use axum_extra::headers::{authorization::Credentials, Authorization};
    use sqlx::PgPool;
    use tower::ServiceExt;

    use crate::tests::{setup_test_env, TestResult};

    #[sqlx::test(fixtures(path = "../fixtures", scripts("users")))]
    async fn test_issue_ok(pool: PgPool) -> TestResult {
        setup_test_env();

        let router = Router::new().merge(router()).with_state(AppState { pool });

        let auth = Authorization::basic(
            "4c14f795-86f0-4361-a02f-0edb966fb145",
            "solongandthanksforallthefish",
        );

        let request = Request::builder()
            .uri("/issue")
            .method("GET")
            .header(AUTHORIZATION, auth.0.encode())
            .body(Body::empty())?;

        let response = router.oneshot(request).await?;

        assert_eq!(StatusCode::OK, response.status());

        Ok(())
    }

    #[sqlx::test(fixtures(path = "../fixtures", scripts("users")))]
    async fn test_issue_unauthorized(pool: PgPool) -> TestResult {
        setup_test_env();

        let router = Router::new().merge(router()).with_state(AppState { pool });

        let auth = Authorization::basic("4c14f795-86f0-4361-a02f-0edb966fb145", "hunter2");

        let request = Request::builder()
            .uri("/issue")
            .method("GET")
            .header(AUTHORIZATION, auth.0.encode())
            .body(Body::empty())?;

        let response = router.oneshot(request).await?;

        assert_eq!(StatusCode::UNAUTHORIZED, response.status());

        Ok(())
    }
}