use std::path::PathBuf;

use super::*;
use crate::item::test::TestItem;
use client::proto;
use fs::{FakeFs, Fs};
use gpui::{TestAppContext, VisualTestContext};
use project::DisableAiSettings;
use serde_json::json;
use settings::SettingsStore;
use util::path;

fn init_test(cx: &mut TestAppContext) {
    cx.update(|cx| {
        let settings_store = SettingsStore::test(cx);
        cx.set_global(settings_store);
        theme_settings::init(theme::LoadThemes::JustBase, cx);
        DisableAiSettings::register(cx);
    });
}

#[gpui::test]
async fn test_sidebar_disabled_when_disable_ai_is_enabled(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    let project = Project::test(fs, [], cx).await;

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project, window, cx));

    multi_workspace.read_with(cx, |mw, cx| {
        assert!(mw.multi_workspace_enabled(cx));
    });

    multi_workspace.update_in(cx, |mw, _window, cx| {
        mw.open_sidebar(cx);
        assert!(mw.sidebar_open());
    });

    cx.update(|_window, cx| {
        DisableAiSettings::override_global(DisableAiSettings { disable_ai: true }, cx);
    });
    cx.run_until_parked();

    multi_workspace.read_with(cx, |mw, cx| {
        assert!(
            !mw.sidebar_open(),
            "Sidebar should be closed when disable_ai is true"
        );
        assert!(
            !mw.multi_workspace_enabled(cx),
            "Multi-workspace should be disabled when disable_ai is true"
        );
    });

    multi_workspace.update_in(cx, |mw, window, cx| {
        mw.toggle_sidebar(window, cx);
    });
    multi_workspace.read_with(cx, |mw, _cx| {
        assert!(
            !mw.sidebar_open(),
            "Sidebar should remain closed when toggled with disable_ai true"
        );
    });

    cx.update(|_window, cx| {
        DisableAiSettings::override_global(DisableAiSettings { disable_ai: false }, cx);
    });
    cx.run_until_parked();

    multi_workspace.read_with(cx, |mw, cx| {
        assert!(
            mw.multi_workspace_enabled(cx),
            "Multi-workspace should be enabled after re-enabling AI"
        );
        assert!(
            !mw.sidebar_open(),
            "Sidebar should still be closed after re-enabling AI (not auto-opened)"
        );
    });

    multi_workspace.update_in(cx, |mw, window, cx| {
        mw.toggle_sidebar(window, cx);
    });
    multi_workspace.read_with(cx, |mw, _cx| {
        assert!(
            mw.sidebar_open(),
            "Sidebar should open when toggled after re-enabling AI"
        );
    });
}

#[gpui::test]
async fn test_project_group_keys_initial(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    let project = Project::test(fs, ["/root_a".as_ref()], cx).await;

    let expected_key = project.read_with(cx, |project, cx| project.project_group_key(cx));

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project, window, cx));

    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys: Vec<ProjectGroupKey> = mw.project_group_keys();
        assert_eq!(keys.len(), 1, "should have exactly one key on creation");
        assert_eq!(keys[0], expected_key);
    });
}

#[gpui::test]
async fn test_project_group_keys_add_workspace(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    fs.insert_tree("/root_b", json!({ "file.txt": "" })).await;
    let project_a = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;
    let project_b = Project::test(fs.clone(), ["/root_b".as_ref()], cx).await;

    let key_a = project_a.read_with(cx, |p, cx| p.project_group_key(cx));
    let key_b = project_b.read_with(cx, |p, cx| p.project_group_key(cx));
    assert_ne!(
        key_a, key_b,
        "different roots should produce different keys"
    );

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project_a, window, cx));

    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });

    multi_workspace.read_with(cx, |mw, _cx| {
        assert_eq!(mw.project_group_keys().len(), 1);
    });

    // Adding a workspace with a different project root adds a new key.
    multi_workspace.update_in(cx, |mw, window, cx| {
        mw.test_add_workspace(project_b, window, cx);
    });

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys: Vec<ProjectGroupKey> = mw.project_group_keys();
        assert_eq!(
            keys.len(),
            2,
            "should have two keys after adding a second workspace"
        );
        assert_eq!(keys[0], key_b);
        assert_eq!(keys[1], key_a);
    });
}

#[gpui::test]
async fn test_open_new_window_does_not_open_sidebar_on_existing_window(cx: &mut TestAppContext) {
    init_test(cx);

    let app_state = cx.update(AppState::test);
    let fs = app_state.fs.as_fake();
    fs.insert_tree(path!("/project_a"), json!({ "file.txt": "" }))
        .await;
    fs.insert_tree(path!("/project_b"), json!({ "file.txt": "" }))
        .await;

    let project = Project::test(app_state.fs.clone(), [path!("/project_a").as_ref()], cx).await;

    let window = cx.add_window(|window, cx| MultiWorkspace::test_new(project, window, cx));

    window
        .read_with(cx, |mw, _cx| {
            assert!(!mw.sidebar_open(), "sidebar should start closed",);
        })
        .unwrap();

    cx.update(|cx| {
        open_paths(
            &[PathBuf::from(path!("/project_b"))],
            app_state,
            OpenOptions {
                open_mode: OpenMode::NewWindow,
                ..OpenOptions::default()
            },
            cx,
        )
    })
    .await
    .unwrap();

    window
        .read_with(cx, |mw, _cx| {
            assert!(
                !mw.sidebar_open(),
                "opening a project in a new window must not open the sidebar on the original window",
            );
        })
        .unwrap();
}

#[gpui::test]
async fn test_open_directory_in_empty_workspace_does_not_open_sidebar(cx: &mut TestAppContext) {
    init_test(cx);

    let app_state = cx.update(AppState::test);
    let fs = app_state.fs.as_fake();
    fs.insert_tree(path!("/project"), json!({ "file.txt": "" }))
        .await;

    let project = Project::test(app_state.fs.clone(), [], cx).await;
    let window = cx.add_window(|window, cx| {
        let mw = MultiWorkspace::test_new(project, window, cx);
        // Simulate a blank project that has an untitled editor tab,
        // so that workspace_windows_for_location finds this window.
        mw.workspace().update(cx, |workspace, cx| {
            workspace.active_pane().update(cx, |pane, cx| {
                let item = cx.new(|cx| item::test::TestItem::new(cx));
                pane.add_item(Box::new(item), false, false, None, window, cx);
            });
        });
        mw
    });

    window
        .read_with(cx, |mw, _cx| {
            assert!(!mw.sidebar_open(), "sidebar should start closed");
        })
        .unwrap();

    // Simulate what open_workspace_for_paths does for an empty workspace:
    // it downgrades OpenMode::NewWindow to Activate and sets requesting_window.
    cx.update(|cx| {
        open_paths(
            &[PathBuf::from(path!("/project"))],
            app_state,
            OpenOptions {
                requesting_window: Some(window),
                open_mode: OpenMode::Activate,
                ..OpenOptions::default()
            },
            cx,
        )
    })
    .await
    .unwrap();

    window
        .read_with(cx, |mw, _cx| {
            assert!(
                !mw.sidebar_open(),
                "opening a directory in a blank project via the file picker must not open the sidebar",
            );
        })
        .unwrap();
}

#[gpui::test]
async fn test_project_group_keys_duplicate_not_added(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    let project_a = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;
    // A second project entity pointing at the same path produces the same key.
    let project_a2 = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;

    let key_a = project_a.read_with(cx, |p, cx| p.project_group_key(cx));
    let key_a2 = project_a2.read_with(cx, |p, cx| p.project_group_key(cx));
    assert_eq!(key_a, key_a2, "same root path should produce the same key");

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project_a, window, cx));

    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });

    multi_workspace.update_in(cx, |mw, window, cx| {
        mw.test_add_workspace(project_a2, window, cx);
    });

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys: Vec<ProjectGroupKey> = mw.project_group_keys();
        assert_eq!(
            keys.len(),
            1,
            "duplicate key should not be added when a workspace with the same root is inserted"
        );
    });
}

#[gpui::test]
async fn test_adding_worktree_updates_project_group_key(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    fs.insert_tree("/root_b", json!({ "other.txt": "" })).await;
    let project = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;

    let initial_key = project.read_with(cx, |p, cx| p.project_group_key(cx));

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project.clone(), window, cx));

    // Open sidebar to retain the workspace and create the initial group.
    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });
    cx.run_until_parked();

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys = mw.project_group_keys();
        assert_eq!(keys.len(), 1);
        assert_eq!(keys[0], initial_key);
    });

    // Add a second worktree to the project. This triggers WorktreeAdded →
    // handle_workspace_key_change, which should update the group key.
    project
        .update(cx, |project, cx| {
            project.find_or_create_worktree("/root_b", true, cx)
        })
        .await
        .expect("adding worktree should succeed");
    cx.run_until_parked();

    let updated_key = project.read_with(cx, |p, cx| p.project_group_key(cx));
    assert_ne!(
        initial_key, updated_key,
        "adding a worktree should change the project group key"
    );

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys = mw.project_group_keys();
        assert!(
            keys.contains(&updated_key),
            "should contain the updated key; got {keys:?}"
        );
    });
}

#[gpui::test]
async fn test_find_or_create_local_workspace_reuses_active_workspace_when_sidebar_closed(
    cx: &mut TestAppContext,
) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    let project = Project::test(fs, ["/root_a".as_ref()], cx).await;

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project, window, cx));

    let active_workspace = multi_workspace.read_with(cx, |mw, cx| {
        assert!(
            mw.project_groups(cx).is_empty(),
            "sidebar-closed setup should start with no retained project groups"
        );
        mw.workspace().clone()
    });
    let active_workspace_id = active_workspace.entity_id();

    let workspace = multi_workspace
        .update_in(cx, |mw, window, cx| {
            mw.find_or_create_local_workspace(
                PathList::new(&[PathBuf::from("/root_a")]),
                None,
                &[],
                None,
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .await
        .expect("reopening the same local workspace should succeed");

    assert_eq!(
        workspace.entity_id(),
        active_workspace_id,
        "should reuse the current active workspace when the sidebar is closed"
    );

    multi_workspace.read_with(cx, |mw, _cx| {
        assert_eq!(
            mw.workspace().entity_id(),
            active_workspace_id,
            "active workspace should remain unchanged after reopening the same path"
        );
        assert_eq!(
            mw.workspaces().count(),
            1,
            "reusing the active workspace should not create a second open workspace"
        );
    });
}

#[gpui::test]
async fn test_find_or_create_workspace_uses_project_group_key_when_paths_are_missing(
    cx: &mut TestAppContext,
) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree(
        "/project",
        json!({
            ".git": {},
            "src": {},
        }),
    )
    .await;
    cx.update(|cx| <dyn Fs>::set_global(fs.clone(), cx));
    let project = Project::test(fs.clone(), ["/project".as_ref()], cx).await;
    project
        .update(cx, |project, cx| project.git_scans_complete(cx))
        .await;

    let project_group_key = project.read_with(cx, |project, cx| project.project_group_key(cx));

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project, window, cx));

    let main_workspace = multi_workspace.read_with(cx, |mw, _cx| mw.workspace().clone());
    let main_workspace_id = main_workspace.entity_id();

    let workspace = multi_workspace
        .update_in(cx, |mw, window, cx| {
            mw.find_or_create_workspace(
                PathList::new(&[PathBuf::from("/wt-feature-a")]),
                None,
                Some(project_group_key.clone()),
                |_options, _window, _cx| Task::ready(Ok(None)),
                &[],
                None,
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .await
        .expect("opening a missing linked-worktree path should fall back to the project group key workspace");

    assert_eq!(
        workspace.entity_id(),
        main_workspace_id,
        "missing linked-worktree paths should reuse the main worktree workspace from the project group key"
    );

    multi_workspace.read_with(cx, |mw, cx| {
        assert_eq!(
            mw.workspace().entity_id(),
            main_workspace_id,
            "the active workspace should remain the main worktree workspace"
        );
        assert_eq!(
            PathList::new(&mw.workspace().read(cx).root_paths(cx)),
            project_group_key.path_list().clone(),
            "the activated workspace should use the project group key path list rather than the missing linked-worktree path"
        );
        assert_eq!(
            mw.workspaces().count(),
            1,
            "falling back to the project group key should not create a second workspace"
        );
    });
}

#[gpui::test]
async fn test_find_or_create_local_workspace_reuses_active_workspace_after_sidebar_open(
    cx: &mut TestAppContext,
) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    let project = Project::test(fs, ["/root_a".as_ref()], cx).await;

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project, window, cx));

    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });
    cx.run_until_parked();

    let active_workspace = multi_workspace.read_with(cx, |mw, cx| {
        assert_eq!(
            mw.project_groups(cx).len(),
            1,
            "opening the sidebar should retain the active workspace in a project group"
        );
        mw.workspace().clone()
    });
    let active_workspace_id = active_workspace.entity_id();

    let workspace = multi_workspace
        .update_in(cx, |mw, window, cx| {
            mw.find_or_create_local_workspace(
                PathList::new(&[PathBuf::from("/root_a")]),
                None,
                &[],
                None,
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .await
        .expect("reopening the same retained local workspace should succeed");

    assert_eq!(
        workspace.entity_id(),
        active_workspace_id,
        "should reuse the retained active workspace after the sidebar is opened"
    );

    multi_workspace.read_with(cx, |mw, _cx| {
        assert_eq!(
            mw.workspaces().count(),
            1,
            "reopening the same retained workspace should not create another workspace"
        );
    });
}

#[gpui::test]
async fn test_close_workspace_prefers_already_loaded_neighboring_workspace(
    cx: &mut TestAppContext,
) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file_a.txt": "" })).await;
    fs.insert_tree("/root_b", json!({ "file_b.txt": "" })).await;
    fs.insert_tree("/root_c", json!({ "file_c.txt": "" })).await;
    let project_a = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;
    let project_b = Project::test(fs.clone(), ["/root_b".as_ref()], cx).await;
    let project_b_key = project_b.read_with(cx, |project, cx| project.project_group_key(cx));
    let project_c = Project::test(fs, ["/root_c".as_ref()], cx).await;
    let project_c_key = project_c.read_with(cx, |project, cx| project.project_group_key(cx));

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project_a, window, cx));

    multi_workspace.update(cx, |multi_workspace, cx| {
        multi_workspace.open_sidebar(cx);
    });
    cx.run_until_parked();

    let workspace_a = multi_workspace.read_with(cx, |multi_workspace, _cx| {
        multi_workspace.workspace().clone()
    });
    let workspace_b = multi_workspace.update_in(cx, |multi_workspace, window, cx| {
        multi_workspace.test_add_workspace(project_b, window, cx)
    });

    multi_workspace.update_in(cx, |multi_workspace, window, cx| {
        multi_workspace.activate(workspace_a.clone(), None, window, cx);
        multi_workspace.test_add_project_group(ProjectGroup {
            key: project_c_key.clone(),
            workspaces: Vec::new(),
            expanded: true,
        });
    });

    multi_workspace.read_with(cx, |multi_workspace, _cx| {
        let keys = multi_workspace.project_group_keys();
        assert_eq!(
            keys.len(),
            3,
            "expected three project groups in the test setup"
        );
        assert_eq!(keys[0], project_b_key);
        assert_eq!(
            keys[1],
            workspace_a.read_with(cx, |workspace, cx| { workspace.project_group_key(cx) })
        );
        assert_eq!(keys[2], project_c_key);
        assert_eq!(
            multi_workspace.workspace().entity_id(),
            workspace_a.entity_id(),
            "workspace A should be active before closing"
        );
    });

    let closed = multi_workspace
        .update_in(cx, |multi_workspace, window, cx| {
            multi_workspace.close_workspace(&workspace_a, window, cx)
        })
        .await
        .expect("closing the active workspace should succeed");

    assert!(
        closed,
        "close_workspace should report that it removed a workspace"
    );

    multi_workspace.read_with(cx, |multi_workspace, cx| {
        assert_eq!(
            multi_workspace.workspace().entity_id(),
            workspace_b.entity_id(),
            "closing workspace A should activate the already-loaded workspace B instead of opening group C"
        );
        assert_eq!(
            multi_workspace.workspaces().count(),
            1,
            "only workspace B should remain loaded after closing workspace A"
        );
        assert!(
            multi_workspace
                .workspaces_for_project_group(&project_c_key, cx)
                .unwrap_or_default()
                .is_empty(),
            "the unloaded neighboring group C should remain unopened"
        );
    });
}

#[gpui::test]
async fn test_switching_projects_with_sidebar_closed_detaches_old_active_workspace(
    cx: &mut TestAppContext,
) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file_a.txt": "" })).await;
    fs.insert_tree("/root_b", json!({ "file_b.txt": "" })).await;
    let project_a = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;
    let project_b = Project::test(fs, ["/root_b".as_ref()], cx).await;

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project_a, window, cx));

    let workspace_a = multi_workspace.read_with(cx, |mw, cx| {
        assert!(
            mw.project_groups(cx).is_empty(),
            "sidebar-closed setup should start with no retained project groups"
        );
        mw.workspace().clone()
    });
    assert!(
        workspace_a.read_with(cx, |workspace, _cx| workspace.session_id().is_some()),
        "initial active workspace should start attached to the session"
    );

    let workspace_b = multi_workspace.update_in(cx, |mw, window, cx| {
        mw.test_add_workspace(project_b, window, cx)
    });
    cx.run_until_parked();

    multi_workspace.read_with(cx, |mw, _cx| {
        assert_eq!(
            mw.workspace().entity_id(),
            workspace_b.entity_id(),
            "the new workspace should become active"
        );
        assert_eq!(
            mw.workspaces().count(),
                        1,
                        "only the new active workspace should remain open after switching with the sidebar closed"
        );
    });

    assert!(
        workspace_a.read_with(cx, |workspace, _cx| workspace.session_id().is_none()),
        "the previous active workspace should be detached when switching away with the sidebar closed"
    );
}

#[gpui::test]
async fn test_remote_project_root_dir_changes_update_groups(cx: &mut TestAppContext) {
    init_test(cx);
    let fs = FakeFs::new(cx.executor());
    fs.insert_tree("/root_a", json!({ "file.txt": "" })).await;
    fs.insert_tree("/local_b", json!({ "file.txt": "" })).await;
    let project_a = Project::test(fs.clone(), ["/root_a".as_ref()], cx).await;
    let project_b = Project::test(fs.clone(), ["/local_b".as_ref()], cx).await;

    let (multi_workspace, cx) =
        cx.add_window_view(|window, cx| MultiWorkspace::test_new(project_a, window, cx));

    multi_workspace.update(cx, |mw, cx| {
        mw.open_sidebar(cx);
    });
    cx.run_until_parked();

    let workspace_b = multi_workspace.update_in(cx, |mw, window, cx| {
        let workspace = cx.new(|cx| Workspace::test_new(project_b.clone(), window, cx));
        let key = workspace.read(cx).project_group_key(cx);
        mw.activate_provisional_workspace(workspace.clone(), key, window, cx);
        workspace
    });
    cx.run_until_parked();

    multi_workspace.read_with(cx, |mw, _cx| {
        assert_eq!(
            mw.workspace().entity_id(),
            workspace_b.entity_id(),
            "registered workspace should become active"
        );
    });

    let initial_key = project_b.read_with(cx, |p, cx| p.project_group_key(cx));
    multi_workspace.read_with(cx, |mw, _cx| {
        let keys = mw.project_group_keys();
        assert!(
            keys.contains(&initial_key),
            "project groups should contain the initial key for the registered workspace"
        );
    });

    let remote_worktree = project_b.update(cx, |project, cx| {
        project.add_test_remote_worktree("/remote/project", cx)
    });
    cx.run_until_parked();

    let worktree_id = remote_worktree.read_with(cx, |wt, _| wt.id().to_proto());
    remote_worktree.update(cx, |worktree, _cx| {
        worktree
            .as_remote()
            .unwrap()
            .update_from_remote(proto::UpdateWorktree {
                project_id: 0,
                worktree_id,
                abs_path: "/remote/project".to_string(),
                root_name: "project".to_string(),
                updated_entries: vec![proto::Entry {
                    id: 1,
                    is_dir: true,
                    path: "".to_string(),
                    inode: 1,
                    mtime: Some(proto::Timestamp {
                        seconds: 0,
                        nanos: 0,
                    }),
                    is_ignored: false,
                    is_hidden: false,
                    is_external: false,
                    is_fifo: false,
                    size: None,
                    canonical_path: None,
                }],
                removed_entries: vec![],
                scan_id: 1,
                is_last_update: true,
                updated_repositories: vec![],
                removed_repositories: vec![],
                root_repo_common_dir: None,
            });
    });
    cx.run_until_parked();

    let updated_key = project_b.read_with(cx, |p, cx| p.project_group_key(cx));
    assert_ne!(
        initial_key, updated_key,
        "remote worktree update should change the project group key"
    );

    multi_workspace.read_with(cx, |mw, _cx| {
        let keys = mw.project_group_keys();
        assert!(
            keys.contains(&updated_key),
            "project groups should contain the updated key after remote change; got {keys:?}"
        );
        assert!(
            !keys.contains(&initial_key),
            "project groups should no longer contain the stale initial key; got {keys:?}"
        );
    });
}

#[gpui::test]
async fn test_open_project_closes_empty_workspace_but_not_non_empty_ones(cx: &mut TestAppContext) {
    init_test(cx);
    let app_state = cx.update(AppState::test);
    let fs = app_state.fs.as_fake();
    fs.insert_tree(path!("/project_a"), json!({ "file_a.txt": "" }))
        .await;
    fs.insert_tree(path!("/project_b"), json!({ "file_b.txt": "" }))
        .await;

    // Start with an empty (no-worktrees) workspace.
    let project = Project::test(app_state.fs.clone(), [], cx).await;
    let window = cx.add_window(|window, cx| MultiWorkspace::test_new(project, window, cx));
    cx.run_until_parked();

    window
        .update(cx, |mw, _window, cx| mw.open_sidebar(cx))
        .unwrap();
    cx.run_until_parked();

    let empty_workspace = window
        .read_with(cx, |mw, _| mw.workspace().clone())
        .unwrap();
    let cx = &mut VisualTestContext::from_window(window.into(), cx);

    // Add a dirty untitled item to the empty workspace.
    let dirty_item = cx.new(|cx| TestItem::new(cx).with_dirty(true));
    empty_workspace.update_in(cx, |workspace, window, cx| {
        workspace.add_item_to_active_pane(Box::new(dirty_item.clone()), None, true, window, cx);
    });

    // Opening a project while the lone empty workspace has unsaved
    // changes prompts the user.
    let open_task = window
        .update(cx, |mw, window, cx| {
            mw.open_project(
                vec![PathBuf::from(path!("/project_a"))],
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .unwrap();
    cx.run_until_parked();

    // Cancelling keeps the empty workspace.
    assert!(cx.has_pending_prompt(),);
    cx.simulate_prompt_answer("Cancel");
    cx.run_until_parked();
    assert_eq!(open_task.await.unwrap(), empty_workspace);
    window
        .read_with(cx, |mw, _cx| {
            assert_eq!(mw.workspaces().count(), 1);
            assert_eq!(mw.workspace(), &empty_workspace);
            assert_eq!(mw.project_group_keys(), vec![]);
        })
        .unwrap();

    // Discarding the unsaved changes closes the empty workspace
    // and opens the new project in its place.
    let open_task = window
        .update(cx, |mw, window, cx| {
            mw.open_project(
                vec![PathBuf::from(path!("/project_a"))],
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .unwrap();
    cx.run_until_parked();

    assert!(cx.has_pending_prompt(),);
    cx.simulate_prompt_answer("Don't Save");
    cx.run_until_parked();

    let workspace_a = open_task.await.unwrap();
    assert_ne!(workspace_a, empty_workspace);

    window
        .read_with(cx, |mw, _cx| {
            assert_eq!(mw.workspaces().count(), 1);
            assert_eq!(mw.workspace(), &workspace_a);
            assert_eq!(
                mw.project_group_keys(),
                vec![ProjectGroupKey::new(
                    None,
                    PathList::new(&[path!("/project_a")])
                )]
            );
        })
        .unwrap();
    assert!(
        empty_workspace.read_with(cx, |workspace, _cx| workspace.session_id().is_none()),
        "the detached empty workspace should no longer be attached to the session",
    );

    let dirty_item = cx.new(|cx| TestItem::new(cx).with_dirty(true));
    workspace_a.update_in(cx, |workspace, window, cx| {
        workspace.add_item_to_active_pane(Box::new(dirty_item.clone()), None, true, window, cx);
    });

    // Opening another project does not close the existing project or prompt.
    let workspace_b = window
        .update(cx, |mw, window, cx| {
            mw.open_project(
                vec![PathBuf::from(path!("/project_b"))],
                OpenMode::Activate,
                window,
                cx,
            )
        })
        .unwrap()
        .await
        .unwrap();
    cx.run_until_parked();

    assert!(!cx.has_pending_prompt());
    assert_ne!(workspace_b, workspace_a);
    window
        .read_with(cx, |mw, _cx| {
            assert_eq!(mw.workspaces().count(), 2);
            assert_eq!(mw.workspace(), &workspace_b);
            assert_eq!(
                mw.project_group_keys(),
                vec![
                    ProjectGroupKey::new(None, PathList::new(&[path!("/project_b")])),
                    ProjectGroupKey::new(None, PathList::new(&[path!("/project_a")]))
                ]
            );
        })
        .unwrap();
    assert!(workspace_a.read_with(cx, |workspace, _cx| workspace.session_id().is_some()),);
}