//! Milestone 0.3 end to end: a proposal from a bookmark and from a fork,

//! an atom-anchored comment, a seal-backed approval, requirements and a

//! landing from the hub.

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::repos::RepoName;

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();

    config.auth.push_tokens = vec!["site".into()];

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

    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}");

    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,

    cookie: Option<String>,

}

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

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

    if let Some(c) = cookie {

        req = req.header(header::COOKIE, format!("oxyhub={c}"));

    }

    if let Some(b) = bearer {

        req = req.header(header::AUTHORIZATION, format!("Bearer {b}"));

    }

    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 cookie = res

        .headers()

        .get(header::SET_COOKIE)

        .and_then(|v| v.to_str().ok())

        .and_then(|v| v.split(';').next())

        .and_then(|kv| kv.split_once('='))

        .map(|(_, v)| v.to_string());

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

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

}

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

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

}

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

    send(app, "POST", path, cookie, Some(form), None).await

}

/// POST a proposal action and follow its redirect back to the page, as a

/// browser does (actions redirect so a reload never repeats them).

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

    let mut req = Request::builder().method("POST").uri(path).header(header::CONTENT_TYPE, "application/x-www-form-urlencoded");

    if let Some(c) = cookie {

        req = req.header(header::COOKIE, format!("oxyhub={c}"));

    }

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

    assert_eq!(res.status(), StatusCode::SEE_OTHER, "{path} redirects back");

    let to = res.headers().get(header::LOCATION).and_then(|v| v.to_str().ok()).unwrap_or("").to_string();

    get(app, &to, cookie).await

}

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

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

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

    r.cookie.unwrap()

}

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 propose_review_seal_and_land() {

    let h = hub().await;

    let app = &h.app;

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

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

    // A repository with main and a feature bookmark, pushed by Andy's client.

    let repo = RepoName::parse("andy/demo").unwrap();

    app.repos.create(&repo, None).unwrap();

    db::repos::create(&app.db, "andy", "demo", "", hub_api::Visibility::Public).await.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/demo", h.base)).unwrap();

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

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

    client.save_config().unwrap();

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

    write(work.path(), ".oxyowners", b"* @andy\n");

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

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

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

    client.bookmark_create("feature", Some(&[base])).unwrap();

    client.bookmark_switch("feature", false).unwrap();

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

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

    let feat = client.commit("add three", &[]).unwrap();

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

    // The compare page offers the proposal to writers only (hub spec §6.3).

    let cmp = get(app, "/andy/demo/compare/main...feature", Some(&andy)).await;

    assert!(cmp.body.contains("href=\"/andy/demo/proposals/new?source=feature&target=main\">Propose this"), "{}", cmp.body);

    assert!(!get(app, "/andy/demo/compare/main...feature", Some(&bob)).await.body.contains("Propose this"));

    assert!(

        !get(app, "/andy/demo/compare/feature...main", Some(&andy)).await.body.contains("Propose this"),

        "nothing to propose the other way"

    );

    // Bob previews and opens a proposal feature → main.

    let preview = get(app, "/andy/demo/proposals/new?source=feature&target=main", Some(&bob)).await;

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

    assert!(preview.body.contains("1 change") && preview.body.contains("add three"), "{}", preview.body);

    let csrf = csrf_of(&preview.body);

    let r =

        post(app, "/andy/demo/proposals/new", Some(&bob), &format!("_csrf={csrf}&title=Add+three&body=Please&target=main&source=feature"))

            .await;

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

    let page = get(app, "/andy/demo/proposal/1", Some(&bob)).await;

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

    assert!(page.body.contains("Add three") && page.body.contains("1 change"), "{}", page.body);

    assert!(page.body.contains("Please"));

    assert!(get(app, "/andy/demo/proposals", None).await.body.contains("#1"));

    let cmp = get(app, "/andy/demo/compare/main...feature", Some(&andy)).await;

    assert!(cmp.body.contains("proposal #1 is open") && !cmp.body.contains("Propose this"), "the open proposal instead");

    // A comment anchored to line 3 of a.txt lands in the thread on the files tab.

    let files = get(app, "/andy/demo/proposal/1?tab=files", Some(&bob)).await;

    assert!(files.body.contains("+three") || files.body.contains(">three<"), "diff shown: {}", files.body);

    let csrf_b = csrf_of(&files.body);

    let r = act(app, "/andy/demo/proposal/1/comment", Some(&bob), &format!("_csrf={csrf_b}&body=nice+line&path=a.txt&line=3")).await;

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

    assert!(r.body.contains("class=\"thread\"") && r.body.contains("nice line"), "anchored comment placed: {}", r.body);

    let c = db::proposals::comments(&app.db, 1).await.unwrap();

    assert_eq!(c[0].anchor_change, feat.to_hex(), "anchored to the atom the feature change introduced");

    // Requirements: one sealed approval and code owners.

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

    let csrf_a = csrf_of(&settings.body);

    assert_eq!(

        post(app, "/andy/demo/settings/requirements", Some(&andy), &format!("_csrf={csrf_a}&required_approvals=1&require_owners=1"))

            .await

            .status,

        StatusCode::OK

    );

    let page = get(app, "/andy/demo/proposal/1", Some(&andy)).await;

    assert!(page.body.contains("0 of 1 required sealed approvals"), "{}", page.body);

    assert!(page.body.contains("code owners still to approve: andy"), "{}", page.body);

    // Bob cannot approve his own; Andy approves, which is pending until sealed.

    let csrf_b = csrf_of(&get(app, "/andy/demo/proposal/1", Some(&bob)).await.body);

    let r = act(app, "/andy/demo/proposal/1/review", Some(&bob), &format!("_csrf={csrf_b}&verdict=approve")).await;

    assert!(r.body.contains("cannot approve your own"), "{}", r.body);

    let r = act(app, "/andy/demo/proposal/1/review", Some(&andy), &format!("_csrf={csrf_a}&verdict=approve&body=LGTM")).await;

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

    assert!(r.body.contains("oxy seal --proposal"));

    // Andy links his key, seals the proposal's change and pushes the seal: the approval counts.

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

    let identity = client.identity(&key).unwrap();

    db::accounts::link_identity(

        &app.db,

        db::accounts::account_by_name(&app.db, "andy").await.unwrap().unwrap().id,

        &key.to_hex(),

        &identity.name,

        &identity.email,

        &identity.encode(),

    )

    .await

    .unwrap();

    let seal = client.seal(&[feat]).unwrap();

    client.push_seals("origin", &[seal]).unwrap();

    let page = get(app, "/andy/demo/proposal/1", Some(&andy)).await;

    assert!(page.body.contains("approved and sealed"), "{}", page.body);

    assert!(page.body.contains("ready to land"), "{}", page.body);

    // The API agrees, and names the projected heads for `oxy proposal land`.

    let api = send(app, "GET", "/api/v1/repos/andy/demo/proposals/1", None, None, Some("site")).await;

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

    let v: serde_json::Value = serde_json::from_str(&api.body).unwrap();

    assert_eq!(v["landable"], true, "{}", api.body);

    assert_eq!(v["approvals"][0]["sealed"], true);

    assert_eq!(v["projected_heads"][0], feat.to_hex());

    assert_eq!(v["changes"][0]["hash"], feat.to_hex());

    // Land from the hub (no policy): main moves to the projected heads.

    let csrf_a = csrf_of(&page.body);

    let r = act(app, "/andy/demo/proposal/1/land", Some(&andy), &format!("_csrf={csrf_a}")).await;

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

    let heads = app.repos.read(&repo, |r, _| Ok(r.bookmarks()?.into_iter().find(|b| b.name == "main").unwrap().heads)).await.unwrap();

    assert_eq!(heads, vec![feat]);

    assert!(get(app, "/andy/demo/proposals?state=landed", None).await.body.contains("#1"));

    assert!(get(app, "/andy/demo/pushes", None).await.body.contains("landed #1 (web)"));

    // Landed, it still shows what it landed, by whom and how, and nothing holds it back.

    let api = send(app, "GET", "/api/v1/repos/andy/demo/proposals/1", None, None, Some("site")).await;

    let v: serde_json::Value = serde_json::from_str(&api.body).unwrap();

    assert_eq!(v["state"], "landed", "{}", api.body);

    assert_eq!(v["changes"][0]["hash"], feat.to_hex(), "{}", api.body);

    assert_eq!(v["blockers"], serde_json::json!([]), "{}", api.body);

    assert_eq!(v["landed"]["by"], "andy");

    assert_eq!(v["landed"]["via"], "web");

    let page = get(app, "/andy/demo/proposal/1", Some(&andy)).await;

    assert!(page.body.contains("by <a href=\"/andy\">andy</a>, web"), "{}", page.body);

    // Lists by state through the API.

    let list = |q: &'static str| async move {

        let r = send(app, "GET", &format!("/api/v1/repos/andy/demo/proposals{q}"), None, None, Some("site")).await;

        serde_json::from_str::<serde_json::Value>(&r.body).unwrap().as_array().unwrap().len()

    };

    assert_eq!(list("").await, 0, "open ones only by default");

    assert_eq!(list("?state=landed").await, 1);

    assert_eq!(list("?state=all").await, 1);

    // A proposal from a fork: a copy of the repository with the same id.

    let fork = RepoName::parse("bob/demo").unwrap();

    app.repos.create(&fork, Some(client.id().unwrap())).unwrap();

    db::repos::create(&app.db, "bob", "demo", "fork", hub_api::Visibility::Public).await.unwrap();

    db::accounts::set_collaborator(

        &app.db,

        db::repos::get(&app.db, "bob", "demo").await.unwrap().unwrap().id,

        Some(db::accounts::account_by_name(&app.db, "bob").await.unwrap().unwrap().id),

        None,

        "admin",

    )

    .await

    .unwrap();

    client.config.set("remote.fork.url", &format!("{}/bob/demo", h.base)).unwrap();

    client.config.set("remote.fork.token", "site").unwrap();

    client.bookmark_switch("main", false).unwrap();

    client.fetch("origin").unwrap();

    client.bookmark_set("main", &[feat]).unwrap();

    client.bookmark_create("fix", Some(&[feat])).unwrap();

    client.bookmark_switch("fix", false).unwrap();

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

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

    let fix = client.commit("add b", &[]).unwrap();

    assert!(client.push_bookmark("fork", "fix", false).unwrap().iter().all(|r| r.ok));

    let preview = get(app, "/andy/demo/proposals/new?source=bob/demo:fix&target=main", Some(&bob)).await;

    assert!(preview.body.contains("add b"), "fork preview: {}", preview.body);

    let csrf = csrf_of(&preview.body);

    let r =

        post(app, "/andy/demo/proposals/new", Some(&bob), &format!("_csrf={csrf}&title=From+fork&target=main&source=bob/demo:fix")).await;

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

    let page = get(app, "/andy/demo/proposal/2?tab=changes", Some(&andy)).await;

    assert!(page.body.contains("add b"), "{}", page.body);

    assert!(

        app.repos.read(&repo, move |r, _| Ok(r.store().has(&fix))).await.unwrap(),

        "the fork's change was copied into the target's store"

    );

    // Closing and reopening.

    let csrf_b = csrf_of(&get(app, "/andy/demo/proposal/2", Some(&bob)).await.body);

    let r = act(app, "/andy/demo/proposal/2/state", Some(&bob), &format!("_csrf={csrf_b}&action=close")).await;

    assert!(r.body.contains(">closed<"), "{}", r.body);

    let r = act(app, "/andy/demo/proposal/2/state", Some(&bob), &format!("_csrf={csrf_b}&action=reopen")).await;

    assert!(r.body.contains(">open<"), "{}", r.body);

}