//! L4 + #4 tests for the layout use cases (`LoadLayout`, `MutateLayout`) and the
//! named-layout management (`ListLayouts`, `CreateLayout`, `RenameLayout`,
//! `DeleteLayout`, `SetActiveLayout`).
//!
//! Every port is faked in-memory so the use cases run without any real I/O.
//! Layouts now persist to `.ideai/layouts.json` (a collection); a legacy
//! `.ideai/layout.json` is migrated transparently.

use std::collections::{HashMap, HashSet};
use std::sync::{Arc, Mutex};

use async_trait::async_trait;
use domain::events::DomainEvent;
use domain::layout::Workspace;
use domain::ports::{
    DirEntry, EventBus, EventStream, FileSystem, FsError, IdGenerator, ProjectStore, RemotePath,
    StoreError,
};
use domain::{
    AgentId, Direction, LayoutId, LayoutNode, LayoutTree, LeafCell, NodeId, Project, ProjectId,
    ProjectPath, RemoteRef, SessionId,
};
use uuid::Uuid;

use application::{
    CreateLayout, CreateLayoutInput, DeleteLayout, DeleteLayoutInput, LayoutKind, LayoutOperation,
    ListLayouts, ListLayoutsInput, LoadLayout, LoadLayoutInput, MutateLayout, MutateLayoutInput,
    RenameLayout, RenameLayoutInput, SetActiveLayout, SetActiveLayoutInput,
};

// ---------------------------------------------------------------------------
// Fakes
// ---------------------------------------------------------------------------

#[derive(Default)]
struct FakeFsInner {
    files: HashMap<String, Vec<u8>>,
    dirs: HashSet<String>,
}

#[derive(Default, Clone)]
struct FakeFs(Arc<Mutex<FakeFsInner>>);

impl FakeFs {
    fn read_file(&self, path: &str) -> Option<Vec<u8>> {
        self.0.lock().unwrap().files.get(path).cloned()
    }
    fn has_dir(&self, path: &str) -> bool {
        self.0.lock().unwrap().dirs.contains(path)
    }
    fn put(&self, path: &str, data: &[u8]) {
        self.0
            .lock()
            .unwrap()
            .files
            .insert(path.to_owned(), data.to_vec());
    }
}

#[async_trait]
impl FileSystem for FakeFs {
    async fn read(&self, path: &RemotePath) -> Result<Vec<u8>, FsError> {
        self.0
            .lock()
            .unwrap()
            .files
            .get(path.as_str())
            .cloned()
            .ok_or_else(|| FsError::NotFound(path.as_str().to_owned()))
    }
    async fn write(&self, path: &RemotePath, data: &[u8]) -> Result<(), FsError> {
        self.0
            .lock()
            .unwrap()
            .files
            .insert(path.as_str().to_owned(), data.to_vec());
        Ok(())
    }
    async fn exists(&self, path: &RemotePath) -> Result<bool, FsError> {
        let inner = self.0.lock().unwrap();
        Ok(inner.files.contains_key(path.as_str()) || inner.dirs.contains(path.as_str()))
    }
    async fn create_dir_all(&self, path: &RemotePath) -> Result<(), FsError> {
        self.0.lock().unwrap().dirs.insert(path.as_str().to_owned());
        Ok(())
    }
    async fn list(&self, _path: &RemotePath) -> Result<Vec<DirEntry>, FsError> {
        Ok(Vec::new())
    }
    async fn symlink(&self, _src: &RemotePath, _dst: &RemotePath) -> Result<(), FsError> {
        Ok(())
    }
}

#[derive(Default)]
struct FakeStoreInner {
    projects: Vec<Project>,
}

#[derive(Default, Clone)]
struct FakeStore(Arc<Mutex<FakeStoreInner>>);

#[async_trait]
impl ProjectStore for FakeStore {
    async fn list_projects(&self) -> Result<Vec<Project>, StoreError> {
        Ok(self.0.lock().unwrap().projects.clone())
    }
    async fn load_project(&self, id: ProjectId) -> Result<Project, StoreError> {
        self.0
            .lock()
            .unwrap()
            .projects
            .iter()
            .find(|p| p.id == id)
            .cloned()
            .ok_or(StoreError::NotFound)
    }
    async fn save_project(&self, project: &Project) -> Result<(), StoreError> {
        self.0.lock().unwrap().projects.push(project.clone());
        Ok(())
    }
    async fn save_workspace(&self, _w: &Workspace) -> Result<(), StoreError> {
        Ok(())
    }
    async fn load_workspace(&self) -> Result<Workspace, StoreError> {
        Ok(Workspace::default())
    }
}

#[derive(Default, Clone)]
struct SpyBus(Arc<Mutex<Vec<DomainEvent>>>);
impl SpyBus {
    fn events(&self) -> Vec<DomainEvent> {
        self.0.lock().unwrap().clone()
    }
}
impl EventBus for SpyBus {
    fn publish(&self, event: DomainEvent) {
        self.0.lock().unwrap().push(event);
    }
    fn subscribe(&self) -> EventStream {
        Box::new(std::iter::empty())
    }
}

struct SeqIds(Mutex<u128>);
impl SeqIds {
    fn new(start: u128) -> Self {
        Self(Mutex::new(start))
    }
}
impl IdGenerator for SeqIds {
    fn new_uuid(&self) -> Uuid {
        let mut n = self.0.lock().unwrap();
        let id = Uuid::from_u128(*n);
        *n += 1;
        id
    }
}

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

const ROOT: &str = "/home/me/proj";
const LAYOUTS_PATH: &str = "/home/me/proj/.ideai/layouts.json";
const LEGACY_PATH: &str = "/home/me/proj/.ideai/layout.json";

fn pid(n: u128) -> ProjectId {
    ProjectId::from_uuid(Uuid::from_u128(n))
}
fn nid(n: u128) -> NodeId {
    NodeId::from_uuid(Uuid::from_u128(n))
}
fn sid(n: u128) -> SessionId {
    SessionId::from_uuid(Uuid::from_u128(n))
}
fn lid(n: u128) -> LayoutId {
    LayoutId::from_uuid(Uuid::from_u128(n))
}

async fn register_project(store: &FakeStore, id: ProjectId) -> ProjectId {
    let project =
        Project::new(id, "Demo", ProjectPath::new(ROOT).unwrap(), RemoteRef::Local, 0).unwrap();
    store.save_project(&project).await.unwrap();
    id
}

fn single_leaf(node_id: NodeId) -> LayoutTree {
    LayoutTree::single(LeafCell {
        id: node_id,
        session: None,
        agent: None,
    })
}

/// Seeds a valid `layouts.json` with a single active layout holding `tree`.
fn seed_layouts(fs: &FakeFs, id: LayoutId, tree: &LayoutTree) {
    let doc = serde_json::json!({
        "version": 1,
        "activeId": id.to_string(),
        "layouts": [ { "id": id.to_string(), "name": "Default", "tree": tree } ],
    });
    fs.put(LAYOUTS_PATH, &serde_json::to_vec(&doc).unwrap());
}

fn doc_json(fs: &FakeFs) -> serde_json::Value {
    serde_json::from_slice(&fs.read_file(LAYOUTS_PATH).expect("layouts.json written")).unwrap()
}

/// The JSON of the active layout's tree.
fn active_tree_json(fs: &FakeFs) -> serde_json::Value {
    let doc = doc_json(fs);
    let active = doc["activeId"].clone();
    doc["layouts"]
        .as_array()
        .unwrap()
        .iter()
        .find(|l| l["id"] == active)
        .expect("active layout present")["tree"]
        .clone()
}

fn read_active_tree(fs: &FakeFs) -> LayoutTree {
    serde_json::from_value(active_tree_json(fs)).expect("active tree parseable")
}

fn root_leaf_id(tree: &LayoutTree) -> NodeId {
    match &tree.root {
        LayoutNode::Leaf(l) => l.id,
        _ => panic!("expected a single-leaf root"),
    }
}

// ---------------------------------------------------------------------------
// LoadLayout
// ---------------------------------------------------------------------------

#[tokio::test]
async fn load_returns_persisted_active_layout() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let id = register_project(&store, pid(1)).await;
    seed_layouts(&fs, lid(1), &single_leaf(nid(42)));

    let load = LoadLayout::new(Arc::new(store), Arc::new(fs));
    let out = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: None,
        })
        .await
        .expect("load succeeds");

    assert_eq!(out.layout_id, lid(1));
    assert_eq!(root_leaf_id(&out.layout), nid(42));
}

#[tokio::test]
async fn load_migrates_a_legacy_layout_json() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let id = register_project(&store, pid(2)).await;
    // Only the legacy single-layout file exists.
    fs.put(LEGACY_PATH, &serde_json::to_vec(&single_leaf(nid(7))).unwrap());

    let load = LoadLayout::new(Arc::new(store), Arc::new(fs.clone()));
    let out = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: None,
        })
        .await
        .expect("legacy layout migrates");

    assert_eq!(root_leaf_id(&out.layout), nid(7), "legacy tree preserved");
    // A layouts.json was written with that tree as the active layout.
    assert_eq!(root_leaf_id(&read_active_tree(&fs)), nid(7));
}

#[tokio::test]
async fn load_defaults_to_single_empty_leaf_when_absent() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let id = register_project(&store, pid(3)).await;

    let load = LoadLayout::new(Arc::new(store), Arc::new(fs.clone()));
    let out = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: None,
        })
        .await
        .expect("absent layout does not fail");

    match &out.layout.root {
        LayoutNode::Leaf(l) => assert!(l.session.is_none()),
        _ => panic!("expected a single default leaf"),
    }
    // Default was written through; two loads are deterministic.
    assert_eq!(root_leaf_id(&read_active_tree(&fs)), root_leaf_id(&out.layout));
    assert!(fs.has_dir("/home/me/proj/.ideai"));
}

#[tokio::test]
async fn load_tolerates_corrupt_json_with_default() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let id = register_project(&store, pid(4)).await;
    fs.put(LAYOUTS_PATH, b"{ not json ]");

    let load = LoadLayout::new(Arc::new(store), Arc::new(fs));
    let out = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: None,
        })
        .await
        .expect("corrupt JSON falls back to default");

    assert!(matches!(out.layout.root, LayoutNode::Leaf(_)));
    assert!(out.layout.validate().is_ok());
}

#[tokio::test]
async fn load_unknown_layout_id_is_not_found() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let id = register_project(&store, pid(5)).await;
    seed_layouts(&fs, lid(1), &single_leaf(nid(1)));

    let load = LoadLayout::new(Arc::new(store), Arc::new(fs));
    let err = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: Some(lid(999)),
        })
        .await
        .expect_err("unknown layout id rejected");
    assert_eq!(err.code(), "NOT_FOUND", "got {err:?}");
}

#[tokio::test]
async fn load_unknown_project_is_not_found() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let load = LoadLayout::new(Arc::new(store), Arc::new(fs));
    let err = load
        .execute(LoadLayoutInput {
            project_id: pid(999),
            layout_id: None,
        })
        .await
        .expect_err("unknown project rejected");
    assert_eq!(err.code(), "NOT_FOUND", "got {err:?}");
}

// ---------------------------------------------------------------------------
// MutateLayout
// ---------------------------------------------------------------------------

struct MutEnv {
    fs: FakeFs,
    bus: SpyBus,
    mutate: MutateLayout,
    project_id: ProjectId,
}

async fn mut_env(project_id: ProjectId) -> MutEnv {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let bus = SpyBus::default();
    register_project(&store, project_id).await;
    seed_layouts(&fs, lid(1), &single_leaf(nid(1)));

    let mutate = MutateLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(bus.clone()),
    );
    MutEnv {
        fs,
        bus,
        mutate,
        project_id,
    }
}

#[tokio::test]
async fn mutate_split_persists_camelcase_layout_and_announces() {
    let env = mut_env(pid(10)).await;
    let out = env
        .mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::Split {
                target: nid(1),
                direction: Direction::Row,
                new_leaf: nid(2),
                container: nid(9),
            },
        })
        .await
        .expect("split succeeds");

    match &out.layout.root {
        LayoutNode::Split(s) => assert_eq!(s.children.len(), 2),
        _ => panic!("expected a split root"),
    }

    assert!(env.fs.has_dir("/home/me/proj/.ideai"));
    let tree = active_tree_json(&env.fs);
    assert_eq!(tree["root"]["type"], "split", "tagged on `type`");
    assert_eq!(tree["root"]["node"]["direction"], "row");
    assert_eq!(tree["root"]["node"]["children"].as_array().unwrap().len(), 2);

    assert_eq!(
        env.bus.events(),
        vec![DomainEvent::LayoutChanged {
            project_id: env.project_id
        }]
    );
}

#[tokio::test]
async fn mutate_resize_writes_new_weights() {
    let env = mut_env(pid(11)).await;
    env.mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::Split {
                target: nid(1),
                direction: Direction::Row,
                new_leaf: nid(2),
                container: nid(9),
            },
        })
        .await
        .unwrap();
    env.mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::Resize {
                container: nid(9),
                weights: vec![3.0, 1.0],
            },
        })
        .await
        .expect("resize succeeds");

    let tree = active_tree_json(&env.fs);
    let children = tree["root"]["node"]["children"].as_array().unwrap();
    assert_eq!(children[0]["weight"], 3.0);
    assert_eq!(children[1]["weight"], 1.0);
}

#[tokio::test]
async fn mutate_set_session_attaches_and_clears() {
    let env = mut_env(pid(12)).await;
    env.mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetSession {
                target: nid(1),
                session: Some(sid(77)),
            },
        })
        .await
        .expect("attach");
    assert_eq!(
        active_tree_json(&env.fs)["root"]["node"]["session"],
        sid(77).to_string()
    );

    let out = env
        .mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetSession {
                target: nid(1),
                session: None,
            },
        })
        .await
        .expect("detach");
    match &out.layout.root {
        LayoutNode::Leaf(l) => assert!(l.session.is_none()),
        _ => panic!("expected leaf root"),
    }
    assert!(active_tree_json(&env.fs)["root"]["node"]
        .get("session")
        .is_none());
}

#[tokio::test]
async fn mutate_invalid_op_errors_and_does_not_persist() {
    let env = mut_env(pid(14)).await;
    // Force the layouts.json to exist first (a clean load) so we have a baseline.
    let before = doc_json(&env.fs);

    let err = env
        .mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetSession {
                target: nid(404),
                session: Some(sid(1)),
            },
        })
        .await
        .expect_err("set_session on unknown node fails");
    assert_eq!(err.code(), "NOT_FOUND", "got {err:?}");

    assert_eq!(before, doc_json(&env.fs), "failed op must not overwrite");
    assert!(env.bus.events().is_empty(), "no event on failed mutation");
}

#[tokio::test]
async fn load_then_set_session_on_returned_id_succeeds() {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let bus = SpyBus::default();
    let id = register_project(&store, pid(22)).await;

    let load = LoadLayout::new(Arc::new(store.clone()), Arc::new(fs.clone()));
    let mutate = MutateLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(bus.clone()),
    );

    let loaded = load
        .execute(LoadLayoutInput {
            project_id: id,
            layout_id: None,
        })
        .await
        .expect("load");
    let leaf = root_leaf_id(&loaded.layout);

    mutate
        .execute(MutateLayoutInput {
            project_id: id,
            layout_id: None,
            operation: LayoutOperation::SetSession {
                target: leaf,
                session: Some(sid(7)),
            },
        })
        .await
        .expect("set_session on the just-loaded leaf id must succeed");

    match &read_active_tree(&fs).root {
        LayoutNode::Leaf(l) => assert_eq!(l.session, Some(sid(7))),
        _ => panic!("expected persisted leaf root"),
    }
}

// ---------------------------------------------------------------------------
// SetCellAgent (#3 — per-cell agent)
// ---------------------------------------------------------------------------

fn aid(n: u128) -> AgentId {
    AgentId::from_uuid(Uuid::from_u128(n))
}

#[tokio::test]
async fn mutate_set_cell_agent_persists_agent_on_leaf() {
    let env = mut_env(pid(50)).await;
    // Attach an agent to the single root leaf (nid(1)).
    env.mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetCellAgent {
                target: nid(1),
                agent: Some(aid(0xAA)),
            },
        })
        .await
        .expect("set_cell_agent attaches");

    // Verify persisted JSON has the agent field.
    let tree_json = active_tree_json(&env.fs);
    assert_eq!(
        tree_json["root"]["node"]["agent"],
        aid(0xAA).to_string(),
        "agent must be persisted on the leaf"
    );

    // Now clear it.
    let out = env
        .mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetCellAgent {
                target: nid(1),
                agent: None,
            },
        })
        .await
        .expect("set_cell_agent clears");

    match &out.layout.root {
        LayoutNode::Leaf(l) => assert_eq!(l.agent, None, "agent must be cleared"),
        _ => panic!("expected leaf root"),
    }
    assert!(
        active_tree_json(&env.fs)["root"]["node"]
            .get("agent")
            .is_none(),
        "cleared agent must not be serialised"
    );
}

#[tokio::test]
async fn mutate_set_cell_agent_missing_leaf_is_not_found() {
    let env = mut_env(pid(51)).await;
    let err = env
        .mutate
        .execute(MutateLayoutInput {
            project_id: env.project_id,
            layout_id: None,
            operation: LayoutOperation::SetCellAgent {
                target: nid(404),
                agent: Some(aid(1)),
            },
        })
        .await
        .expect_err("unknown node rejected");
    assert_eq!(err.code(), "NOT_FOUND", "got {err:?}");
}

// ---------------------------------------------------------------------------
// Named-layout management (#4)
// ---------------------------------------------------------------------------

/// Builds a project + fs + bus with a seeded single "Default" layout (id 1).
async fn mgmt_env(project_id: ProjectId) -> (FakeStore, FakeFs, SpyBus) {
    let store = FakeStore::default();
    let fs = FakeFs::default();
    let bus = SpyBus::default();
    register_project(&store, project_id).await;
    seed_layouts(&fs, lid(1), &single_leaf(nid(1)));
    (store, fs, bus)
}

#[tokio::test]
async fn create_layout_appends_and_activates_it() {
    let (store, fs, bus) = mgmt_env(pid(30)).await;
    let create = CreateLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(SeqIds::new(0xABC)),
        Arc::new(bus.clone()),
    );
    let out = create
        .execute(CreateLayoutInput {
            project_id: pid(30),
            name: "Backend".to_owned(),
            kind: LayoutKind::Terminal,
        })
        .await
        .unwrap();

    let list = ListLayouts::new(Arc::new(store), Arc::new(fs))
        .execute(ListLayoutsInput { project_id: pid(30) })
        .await
        .unwrap();
    assert_eq!(list.layouts.len(), 2, "Default + Backend");
    assert_eq!(list.active_id, out.layout_id, "new layout is active");
    assert!(list.layouts.iter().any(|l| l.name == "Backend"));
}

#[tokio::test]
async fn create_layout_rejects_empty_name() {
    let (store, fs, bus) = mgmt_env(pid(31)).await;
    let err = CreateLayout::new(
        Arc::new(store),
        Arc::new(fs),
        Arc::new(SeqIds::new(1)),
        Arc::new(bus),
    )
    .execute(CreateLayoutInput {
        project_id: pid(31),
        name: "   ".to_owned(),
        kind: LayoutKind::Terminal,
    })
    .await
    .unwrap_err();
    assert_eq!(err.code(), "INVALID", "got {err:?}");
}

#[tokio::test]
async fn rename_layout_changes_the_name() {
    let (store, fs, bus) = mgmt_env(pid(32)).await;
    RenameLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(bus),
    )
    .execute(RenameLayoutInput {
        project_id: pid(32),
        layout_id: lid(1),
        name: "Main".to_owned(),
    })
    .await
    .unwrap();

    let list = ListLayouts::new(Arc::new(store), Arc::new(fs))
        .execute(ListLayoutsInput { project_id: pid(32) })
        .await
        .unwrap();
    assert_eq!(list.layouts[0].name, "Main");
}

#[tokio::test]
async fn delete_layout_rejects_the_last_one() {
    let (store, fs, bus) = mgmt_env(pid(33)).await;
    let err = DeleteLayout::new(Arc::new(store), Arc::new(fs), Arc::new(bus))
        .execute(DeleteLayoutInput {
            project_id: pid(33),
            layout_id: lid(1),
        })
        .await
        .unwrap_err();
    assert_eq!(err.code(), "INVALID", "cannot delete the last layout");
}

#[tokio::test]
async fn delete_active_layout_reassigns_active() {
    let (store, fs, bus) = mgmt_env(pid(34)).await;
    // Add a second layout (becomes active), then delete it → active falls back.
    let created = CreateLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(SeqIds::new(0xD)),
        Arc::new(bus.clone()),
    )
    .execute(CreateLayoutInput {
        project_id: pid(34),
        name: "Second".to_owned(),
        kind: LayoutKind::Terminal,
    })
    .await
    .unwrap();

    let out = DeleteLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(bus),
    )
    .execute(DeleteLayoutInput {
        project_id: pid(34),
        layout_id: created.layout_id,
    })
    .await
    .unwrap();
    assert_eq!(out.active_id, lid(1), "active fell back to the Default layout");

    let list = ListLayouts::new(Arc::new(store), Arc::new(fs))
        .execute(ListLayoutsInput { project_id: pid(34) })
        .await
        .unwrap();
    assert_eq!(list.layouts.len(), 1);
}

#[tokio::test]
async fn set_active_layout_switches_and_load_follows() {
    let (store, fs, bus) = mgmt_env(pid(35)).await;
    let created = CreateLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(SeqIds::new(0xE)),
        Arc::new(bus.clone()),
    )
    .execute(CreateLayoutInput {
        project_id: pid(35),
        name: "Second".to_owned(),
        kind: LayoutKind::Terminal,
    })
    .await
    .unwrap();

    // Switch back to the Default layout.
    SetActiveLayout::new(
        Arc::new(store.clone()),
        Arc::new(fs.clone()),
        Arc::new(bus),
    )
    .execute(SetActiveLayoutInput {
        project_id: pid(35),
        layout_id: lid(1),
    })
    .await
    .unwrap();

    let loaded = LoadLayout::new(Arc::new(store), Arc::new(fs))
        .execute(LoadLayoutInput {
            project_id: pid(35),
            layout_id: None,
        })
        .await
        .unwrap();
    assert_eq!(loaded.layout_id, lid(1));
    assert_ne!(loaded.layout_id, created.layout_id);
}