//! Milestone 0.2 end to end: registration, sessions, tokens, roles and

//! visibility, linked identities with attribution, organisations.

use axum::body::Body;

use axum::http::{header, Request, StatusCode};

use http_body_util::BodyExt;

use oxy_core::repo::Repo;

use oxygenhub::config::Config;

use oxygenhub::db;

use oxygenhub::Shared;

use std::path::Path;

use tower::ServiceExt;

fn hermetic() {

    static ONCE: std::sync::Once = std::sync::Once::new();

    static DIR: std::sync::OnceLock<tempfile::TempDir> = std::sync::OnceLock::new();

    ONCE.call_once(|| {

        let d = tempfile::tempdir().unwrap();

        std::env::set_var("OXY_HOME", d.path());

        DIR.set(d).ok();

    });

}

fn write(root: &Path, rel: &str, content: &[u8]) {

    let p = root.join(rel);

    std::fs::create_dir_all(p.parent().unwrap()).unwrap();

    std::fs::write(p, content).unwrap();

}

struct Hub {

    app: Shared,

    base: String,

    _dir: tempfile::TempDir,

}

async fn hub() -> Hub {

    hermetic();

    let dir = tempfile::tempdir().unwrap();

    let mut config = Config::load(dir.path()).unwrap();

    let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();

    let port = listener.local_addr().unwrap().port();

    config.server.base_url = format!("http://127.0.0.1:{port}");

    config.registration.mode = "invite".into();

    let app = oxygenhub::build(config).await.unwrap();

    let router = oxygenhub::router(app.clone());

    tokio::spawn(async move { axum::serve(listener, router).await.unwrap() });

    Hub { app, base: format!("http://127.0.0.1:{port}"), _dir: dir }

}

struct Res {

    status: StatusCode,

    body: String,

    /// The session cookie's value, when the response set one.

    cookie: Option<String>,

    location: Option<String>,

    /// Every Set-Cookie header, whole.

    raw_cookies: Vec<String>,

}

async fn send(app: &Shared, method: &str, path: &str, cookie: Option<&str>, form: Option<&str>) -> Res {

    let header_value = cookie.map(|c| format!("oxyhub={c}"));

    send_with(app, method, path, header_value.as_deref(), form).await

}

/// As `send`, with the whole Cookie header given.

async fn send_with(app: &Shared, method: &str, path: &str, cookie_header: Option<&str>, form: Option<&str>) -> Res {

    let mut req = Request::builder().method(method).uri(path);

    if let Some(c) = cookie_header {

        req = req.header(header::COOKIE, c.to_string());

    }

    let body = match form {

        Some(f) => {

            req = req.header(header::CONTENT_TYPE, "application/x-www-form-urlencoded");

            Body::from(f.to_string())

        }

        None => Body::empty(),

    };

    let res = oxygenhub::router(app.clone()).oneshot(req.body(body).unwrap()).await.unwrap();

    let status = res.status();

    let raw_cookies: Vec<String> =

        res.headers().get_all(header::SET_COOKIE).iter().filter_map(|v| v.to_str().ok()).map(String::from).collect();

    let cookie =

        raw_cookies.iter().filter_map(|c| c.split(';').next()).filter_map(|kv| kv.strip_prefix("oxyhub=")).map(String::from).next();

    let location = res.headers().get(header::LOCATION).and_then(|v| v.to_str().ok()).map(String::from);

    let bytes = res.into_body().collect().await.unwrap().to_bytes();

    Res { status, body: String::from_utf8_lossy(&bytes).into_owned(), cookie, location, raw_cookies }

}

async fn get(app: &Shared, path: &str, cookie: Option<&str>) -> Res {

    send(app, "GET", path, cookie, None).await

}

async fn post(app: &Shared, path: &str, cookie: Option<&str>, form: &str) -> Res {

    send(app, "POST", path, cookie, Some(form)).await

}

/// Register (or sign in) and return the session cookie value.

async fn register(app: &Shared, user: &str, invite: &str) -> String {

    let r =

        post(app, "/register", None, &format!("username={user}&email={user}%40example.com&password=correct-horse-battery&invite={invite}"))

            .await;

    assert_eq!(r.status, StatusCode::SEE_OTHER, "{}", r.body);

    r.cookie.expect("session cookie")

}

fn csrf_of(page: &str) -> String {

    let i = page.find("name=\"_csrf\" value=\"").expect("csrf field") + "name=\"_csrf\" value=\"".len();

    page[i..].split('"').next().unwrap().to_string()

}

#[tokio::test(flavor = "multi_thread")]

async fn accounts_roles_tokens_and_attribution() {

    let h = hub().await;

    let app = &h.app;

    // The first account registers without an invitation and is the administrator.

    let andy = register(app, "andy", "").await;

    let me = db::accounts::account_by_name(&app.db, "andy").await.unwrap().unwrap();

    assert!(me.is_admin);

    // A second registration needs an invitation.

    let r = post(app, "/register", None, "username=mallory&email=m%40example.com&password=correct-horse-battery&invite=").await;

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

    assert!(r.body.contains("invitation"), "{}", r.body);

    let admin_page = get(app, "/admin", Some(&andy)).await;

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

    let csrf = csrf_of(&admin_page.body);

    let r = post(app, "/admin/invite", Some(&andy), &format!("_csrf={csrf}")).await;

    let code = r.body.split("register?invite=").nth(1).unwrap().split('<').next().unwrap().trim().to_string();

    let bob = register(app, "bob", &code).await;

    assert!(!db::accounts::account_by_name(&app.db, "bob").await.unwrap().unwrap().is_admin);

    // Wrong password, banned users and CSRF-less posts are refused.

    assert_eq!(post(app, "/login", None, "username=andy&password=nope").await.status, StatusCode::OK);

    assert_eq!(post(app, "/settings", Some(&andy), "_csrf=bogus&display_name=x&email=y").await.status, StatusCode::BAD_REQUEST);

    assert_eq!(get(app, "/settings", None).await.status, StatusCode::SEE_OTHER, "anonymous settings redirects to sign in");

    // Andy creates a private repository through the form; Bob cannot see it.

    let new_page = get(app, "/new", Some(&andy)).await;

    let csrf = csrf_of(&new_page.body);

    let r = post(app, "/new", Some(&andy), &format!("_csrf={csrf}&owner=andy&name=secret&description=hush&visibility=private")).await;

    assert_eq!(r.status, StatusCode::SEE_OTHER, "{}", r.body);

    assert_eq!(get(app, "/andy/secret", Some(&andy)).await.status, StatusCode::OK);

    assert_eq!(get(app, "/andy/secret", Some(&bob)).await.status, StatusCode::NOT_FOUND);

    assert_eq!(get(app, "/andy/secret", None).await.status, StatusCode::NOT_FOUND);

    assert!(!get(app, "/", Some(&bob)).await.body.contains("secret"));

    assert!(get(app, "/", Some(&andy)).await.body.contains("secret"));

    // Tokens: a read-only token cannot push; a write token can. Anonymous cannot read a private repository.

    let tokens_page = get(app, "/settings/tokens", Some(&andy)).await;

    let csrf = csrf_of(&tokens_page.body);

    let r = post(app, "/settings/tokens", Some(&andy), &format!("_csrf={csrf}&name=ro&scopes=repo%3Aread")).await;

    let ro = r.body.split("oxyhub_").nth(1).map(|s| format!("oxyhub_{}", s.split('<').next().unwrap().trim())).unwrap();

    let r = post(app, "/settings/tokens", Some(&andy), &format!("_csrf={csrf}&name=rw&scopes=repo%3Aread&scopes=repo%3Awrite")).await;

    let rw = r.body.split("oxyhub_").nth(1).map(|s| format!("oxyhub_{}", s.split('<').next().unwrap().trim())).unwrap();

    let work = tempfile::tempdir().unwrap();

    let mut client = Repo::init(work.path()).unwrap();

    client.create_identity("Andy McCall", "[email protected]", oxy_core::repo::IdentityScope::User).unwrap();

    client.config.set("remote.origin.url", &format!("{}/andy/secret", h.base)).unwrap();

    client.config.set("core.sign", "change").unwrap();

    client.save_config().unwrap();

    write(work.path(), "a.txt", b"a\n");

    client.snapshot("t").unwrap();

    let c1 = client.commit("first", &[]).unwrap();

    let err = client.push("origin", false).err().unwrap().to_string();

    assert!(err.contains("404"), "anonymous cannot even see it: {err}");

    client.config.set("remote.origin.token", &ro).unwrap();

    let err = client.push("origin", false).err().unwrap().to_string();

    assert!(err.contains("403"), "read-only token cannot push: {err}");

    client.config.set("remote.origin.token", &rw).unwrap();

    assert!(client.push("origin", false).unwrap().iter().all(|r| r.ok));

    // Bob's token cannot read it either.

    let bob_tokens = get(app, "/settings/tokens", Some(&bob)).await;

    let csrf_b = csrf_of(&bob_tokens.body);

    let r = post(app, "/settings/tokens", Some(&bob), &format!("_csrf={csrf_b}&name=b&scopes=repo%3Aread&scopes=repo%3Awrite")).await;

    let bob_tok = r.body.split("oxyhub_").nth(1).map(|s| format!("oxyhub_{}", s.split('<').next().unwrap().trim())).unwrap();

    std::env::set_var("OXY_TOKEN", &bob_tok);

    let err = Repo::clone(&format!("{}/andy/secret", h.base), &work.path().join("bobclone")).err().unwrap().to_string();

    std::env::remove_var("OXY_TOKEN");

    assert!(err.contains("404"), "{err}");

    // The push log names the pusher.

    tokio::time::sleep(std::time::Duration::from_millis(150)).await;

    let pushes = get(app, "/andy/secret/pushes", Some(&andy)).await.body;

    assert!(pushes.contains("andy"), "{pushes}");

    // Bob becomes a collaborator with write, and can then see and push.

    let settings = get(app, "/andy/secret/settings", Some(&andy)).await;

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

    let csrf = csrf_of(&settings.body);

    let r = post(app, "/andy/secret/settings/collaborators", Some(&andy), &format!("_csrf={csrf}&username=bob&role=write")).await;

    assert_eq!(r.status, StatusCode::OK, "{}", r.body);

    assert_eq!(get(app, "/andy/secret", Some(&bob)).await.status, StatusCode::OK);

    assert_eq!(get(app, "/andy/secret/settings", Some(&bob)).await.status, StatusCode::NOT_FOUND, "write is not maintain");

    std::env::set_var("OXY_TOKEN", &bob_tok);

    let ok = Repo::clone(&format!("{}/andy/secret", h.base), &work.path().join("bobclone2")).is_ok();

    std::env::remove_var("OXY_TOKEN");

    assert!(ok);

    // oxygen#47: signed in once (oxy auth login), a private repository

    // clones with no OXY_TOKEN, and the clone keeps no token of its own.

    let store = oxy_core::credentials::Credentials::user();

    let hub = oxy_core::credentials::hub_of(&h.base).unwrap();

    store.save(&hub, &rw, Some("andy"), None).unwrap();

    let signed_in = Repo::clone(&format!("{}/andy/secret", h.base), &work.path().join("signedin"));

    store.remove(&hub).unwrap();

    let signed_in = signed_in.unwrap();

    assert!(signed_in.config.remote_tokens.is_empty());

    assert_eq!(signed_in.bookmark_heads().unwrap(), vec![c1]);

    // Linking a key: upload the identity, sign the challenge, see attribution.

    let (key, identity) = {

        let k = client.config.author_key.unwrap();

        (k, client.identity(&k).unwrap())

    };

    let keys_page = get(app, "/settings/keys", Some(&andy)).await;

    let csrf = csrf_of(&keys_page.body);

    let boundary = "XYZ";

    let mut multipart = Vec::new();

    multipart.extend_from_slice(format!("--{boundary}\r\nContent-Disposition: form-data; name=\"_csrf\"\r\n\r\n{csrf}\r\n").as_bytes());

    multipart.extend_from_slice(format!("--{boundary}\r\nContent-Disposition: form-data; name=\"identity\"; filename=\"me.identity\"\r\nContent-Type: application/octet-stream\r\n\r\n").as_bytes());

    multipart.extend_from_slice(&identity.encode());

    multipart.extend_from_slice(format!("\r\n--{boundary}--\r\n").as_bytes());

    let req = Request::builder()

        .method("POST")

        .uri("/settings/keys/upload")

        .header(header::COOKIE, format!("oxyhub={andy}"))

        .header(header::CONTENT_TYPE, format!("multipart/form-data; boundary={boundary}"))

        .body(Body::from(multipart))

        .unwrap();

    let res = oxygenhub::router(app.clone()).oneshot(req).await.unwrap();

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

    let body = String::from_utf8_lossy(&res.into_body().collect().await.unwrap().to_bytes()).into_owned();

    let challenge_hex = body.split("sign-challenge ").nth(1).unwrap().split('<').next().unwrap().trim().to_string();

    let challenge_id = body.split("name=\"challenge\" value=\"").nth(1).unwrap().split('"').next().unwrap().to_string();

    let (_, sk) = client.secret_key().unwrap().unwrap();

    let sig = sk.sign_challenge(&key, &hex::decode(&challenge_hex).unwrap()).unwrap();

    let sig_hex = hex::encode(oxy_core::identity::Signature::encode_list(&[sig]));

    let r = post(app, "/settings/keys/verify", Some(&andy), &format!("_csrf={csrf}&challenge={challenge_id}&signature={sig_hex}")).await;

    assert!(r.body.contains("Key linked"), "{}", r.body);

    let hist = get(app, "/andy/secret/changes/main", Some(&andy)).await.body;

    assert!(hist.contains("href=\"/andy\">Andy McCall</a>"), "author linked to the account: {hist}");

    let change = get(app, &format!("/andy/secret/change/{}", c1.to_hex()), Some(&andy)).await.body;

    assert!(change.contains("@andy"), "{change}");

    // A forged signature is refused.

    let r = post(app, "/settings/keys/verify", Some(&andy), &format!("_csrf={csrf}&challenge=999&signature={sig_hex}")).await;

    assert!(r.body.contains("expired"), "{}", r.body);

    // Organisations: a private org repository is visible to members through the default role.

    let org_page = get(app, "/orgs/new", Some(&andy)).await;

    let csrf = csrf_of(&org_page.body);

    let r = post(app, "/orgs/new", Some(&andy), &format!("_csrf={csrf}&name=acme&display_name=Acme")).await;

    assert_eq!(r.status, StatusCode::SEE_OTHER, "{}", r.body);

    let new_page = get(app, "/new", Some(&andy)).await;

    let csrf = csrf_of(&new_page.body);

    assert_eq!(

        post(app, "/new", Some(&andy), &format!("_csrf={csrf}&owner=acme&name=plans&visibility=private")).await.status,

        StatusCode::SEE_OTHER

    );

    assert_eq!(get(app, "/acme/plans", Some(&bob)).await.status, StatusCode::NOT_FOUND);

    let org_settings = get(app, "/orgs/acme/settings", Some(&andy)).await;

    let csrf = csrf_of(&org_settings.body);

    assert_eq!(

        post(app, "/orgs/acme/settings/members", Some(&andy), &format!("_csrf={csrf}&username=bob&role=member")).await.status,

        StatusCode::OK

    );

    assert_eq!(get(app, "/acme/plans", Some(&bob)).await.status, StatusCode::OK, "members read by default");

    assert_eq!(get(app, "/orgs/acme/settings", Some(&bob)).await.status, StatusCode::NOT_FOUND, "members do not administer");

    // Bob cannot create under acme's... he can, as a member; a stranger cannot.

    let r = post(

        app,

        "/new",

        Some(&bob),

        &format!("_csrf={}&owner=acme&name=bobs&visibility=public", csrf_of(&get(app, "/new", Some(&bob)).await.body)),

    )

    .await;

    assert_eq!(r.status, StatusCode::SEE_OTHER, "{}", r.body);

    // Sign out everywhere invalidates the old cookie.

    let sec = get(app, "/settings/security", Some(&andy)).await;

    let csrf = csrf_of(&sec.body);

    let r = post(app, "/settings/security/sessions", Some(&andy), &format!("_csrf={csrf}")).await;

    assert_eq!(r.status, StatusCode::SEE_OTHER);

    assert_eq!(get(app, "/settings", Some(&andy)).await.status, StatusCode::SEE_OTHER, "old session is gone");

    let fresh = r.cookie.unwrap();

    assert_eq!(get(app, "/settings", Some(&fresh)).await.status, StatusCode::OK);

    // TOTP: enable with the current code, then sign in needs it.

    let sec = get(app, "/settings/security", Some(&fresh)).await;

    let csrf = csrf_of(&sec.body);

    let r = post(app, "/settings/security/totp/begin", Some(&fresh), &format!("_csrf={csrf}")).await;

    let secret = r.body.split("name=\"secret\" value=\"").nth(1).unwrap().split('"').next().unwrap().to_string();

    let now = (db::now_ms() / 1000) as u64;

    let code = oxygenhub::auth::totp::current(&secret, now).unwrap();

    let r = post(app, "/settings/security/totp/enable", Some(&fresh), &format!("_csrf={csrf}&secret={secret}&code={code}")).await;

    assert!(r.body.contains("Recovery codes"), "{}", r.body);

    let r = post(app, "/login", None, "username=andy&password=correct-horse-battery").await;

    assert!(r.body.contains("authenticator"), "second step asked: {}", r.body);

    // Submit the second step as a browser would: every field of the

    // rendered form, each name once (a repeated name is refused).

    let form = &r.body[r.body.find("<form class=\"card\" method=\"post\" action=\"/login\">").unwrap()..];

    let form = &form[..form.find("</form>").unwrap()];

    let names: Vec<&str> = form.split("name=\"").skip(1).map(|t| t.split('"').next().unwrap()).collect();

    let mut unique = names.clone();

    unique.sort();

    unique.dedup();

    assert_eq!(unique.len(), names.len(), "a field named twice: {names:?}");

    // The code step asks for the code alone: the password is not typed

    // again, the step carries proof of it instead.

    assert!(!names.contains(&"password"), "{names:?}");

    let pending = form.split("name=\"pending\" value=\"").nth(1).unwrap().split('"').next().unwrap().to_string();

    let code = oxygenhub::auth::totp::current(&secret, (db::now_ms() / 1000) as u64).unwrap();

    let fill = |pending: &str| -> String {

        names

            .iter()

            .map(|n| match *n {

                "username" => "username=andy".to_string(),

                "pending" => format!("pending={pending}"),

                "code" => format!("code={code}"),

                other => format!("{other}="),

            })

            .collect::<Vec<_>>()

            .join("&")

    };

    // A forged or stale proof starts again.

    let r = post(app, "/login", None, &fill("1.forged")).await;

    assert!(r.body.contains("sign in again") && r.cookie.is_none(), "{}", r.body);

    let r = post(app, "/login", None, &fill(&pending)).await;

    assert_eq!(r.status, StatusCode::SEE_OTHER, "{}", r.body);

    assert!(r.cookie.is_some());

    assert!(r.location.as_deref() == Some("/"));

}

/// A multipart picture form.

fn picture_form(csrf: &str, action: &str, file: &[u8]) -> (String, Vec<u8>) {

    let boundary = "picture-boundary-1234";

    let mut body = Vec::new();

    body.extend_from_slice(format!("--{boundary}\r\nContent-Disposition: form-data; name=\"_csrf\"\r\n\r\n{csrf}\r\n").as_bytes());

    body.extend_from_slice(format!("--{boundary}\r\nContent-Disposition: form-data; name=\"action\"\r\n\r\n{action}\r\n").as_bytes());

    body.extend_from_slice(

        format!("--{boundary}\r\nContent-Disposition: form-data; name=\"picture\"; filename=\"me.png\"\r\nContent-Type: image/png\r\n\r\n")

            .as_bytes(),

    );

    body.extend_from_slice(file);

    body.extend_from_slice(format!("\r\n--{boundary}--\r\n").as_bytes());

    (format!("multipart/form-data; boundary={boundary}"), body)

}

async fn upload(app: &Shared, path: &str, cookie: &str, csrf: &str, action: &str, file: &[u8]) -> Res {

    let (ct, body) = picture_form(csrf, action, file);

    let req = Request::post(path)

        .header(header::COOKIE, format!("oxyhub={cookie}"))

        .header(header::CONTENT_TYPE, ct)

        .body(Body::from(body))

        .unwrap();

    let res = oxygenhub::router(app.clone()).oneshot(req).await.unwrap();

    let status = res.status();

    let bytes = res.into_body().collect().await.unwrap().to_bytes();

    Res { status, body: String::from_utf8_lossy(&bytes).into_owned(), cookie: None, location: None, raw_cookies: vec![] }