[8.x] [Lens] Fix switchVisualizationType to use it without layerId (#…

…196295) (#196448)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Lens] Fix switchVisualizationType to use it without layerId
(#196295)](#196295)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Marta
Bondyra","email":"4283304+mbondyra@users.noreply.github.com"},"sourceCommit":{"committedDate":"2024-10-15T21:53:00Z","message":"[Lens]
Fix switchVisualizationType to use it without layerId (#196295)\n\nWith
[PR #187475](https://github.com/elastic/kibana/pull/187475/files)\r\nwe
introduced a bug, affecting the AI assistant's suggestions API
when\r\nswitching between different chart types (e.g., from bar to line
chart).\r\nThis feature relies on the switchVisualizationType method,
which was\r\nchanged to require a `layerId`. However, the suggestions
API does not\r\nprovide `layerId`, causing the chart type to not switch
as expected.\r\n\r\nSolution:\r\nThe bug can be resolved by modifying
the logic in the\r\n`switchVisualizationType` method. We
changed:\r\n\r\n```ts\r\nconst dataLayer = state.layers.find((l) =>
l.layerId === layerId);\r\n```\r\n\r\nto:\r\n\r\n```ts\r\nconst
dataLayer = state.layers.find((l) => l.layerId === layerId) ??
state.layers[0];\r\n```\r\n\r\nThis ensures that the suggestions API
falls back to the first layer if\r\nno specific layerId is
provided.\r\n\r\n---------\r\n\r\nCo-authored-by: Marco Vettorello
<vettorello.marco@gmail.com>","sha":"e4762201fdd84f372c78bc2a159061e504b26e78","branchLabelMapping":{"^v9.0.0$":"main","^v8.16.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Visualizations","release_note:skip","Feature:Lens","v9.0.0","backport:prev-minor"],"title":"[Lens]
Fix switchVisualizationType to use it without
layerId","number":196295,"url":"https://github.com/elastic/kibana/pull/196295","mergeCommit":{"message":"[Lens]
Fix switchVisualizationType to use it without layerId (#196295)\n\nWith
[PR #187475](https://github.com/elastic/kibana/pull/187475/files)\r\nwe
introduced a bug, affecting the AI assistant's suggestions API
when\r\nswitching between different chart types (e.g., from bar to line
chart).\r\nThis feature relies on the switchVisualizationType method,
which was\r\nchanged to require a `layerId`. However, the suggestions
API does not\r\nprovide `layerId`, causing the chart type to not switch
as expected.\r\n\r\nSolution:\r\nThe bug can be resolved by modifying
the logic in the\r\n`switchVisualizationType` method. We
changed:\r\n\r\n```ts\r\nconst dataLayer = state.layers.find((l) =>
l.layerId === layerId);\r\n```\r\n\r\nto:\r\n\r\n```ts\r\nconst
dataLayer = state.layers.find((l) => l.layerId === layerId) ??
state.layers[0];\r\n```\r\n\r\nThis ensures that the suggestions API
falls back to the first layer if\r\nno specific layerId is
provided.\r\n\r\n---------\r\n\r\nCo-authored-by: Marco Vettorello
<vettorello.marco@gmail.com>","sha":"e4762201fdd84f372c78bc2a159061e504b26e78"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/196295","number":196295,"mergeCommit":{"message":"[Lens]
Fix switchVisualizationType to use it without layerId (#196295)\n\nWith
[PR #187475](https://github.com/elastic/kibana/pull/187475/files)\r\nwe
introduced a bug, affecting the AI assistant's suggestions API
when\r\nswitching between different chart types (e.g., from bar to line
chart).\r\nThis feature relies on the switchVisualizationType method,
which was\r\nchanged to require a `layerId`. However, the suggestions
API does not\r\nprovide `layerId`, causing the chart type to not switch
as expected.\r\n\r\nSolution:\r\nThe bug can be resolved by modifying
the logic in the\r\n`switchVisualizationType` method. We
changed:\r\n\r\n```ts\r\nconst dataLayer = state.layers.find((l) =>
l.layerId === layerId);\r\n```\r\n\r\nto:\r\n\r\n```ts\r\nconst
dataLayer = state.layers.find((l) => l.layerId === layerId) ??
state.layers[0];\r\n```\r\n\r\nThis ensures that the suggestions API
falls back to the first layer if\r\nno specific layerId is
provided.\r\n\r\n---------\r\n\r\nCo-authored-by: Marco Vettorello
<vettorello.marco@gmail.com>","sha":"e4762201fdd84f372c78bc2a159061e504b26e78"}}]}]
BACKPORT-->

Co-authored-by: Marta Bondyra <4283304+mbondyra@users.noreply.github.com>

x-pack/plugins/lens/public/visualizations/xy/visualization.test.tsx

@@ -4214,4 +4214,30 @@ describe('xy_visualization', () => {
       `);
     });
   });
+  describe('switchVisualizationType', () => {
+    it('should switch all the layers to the new visualization type if layerId is not specified (AI assistant case)', () => {
+      const state = exampleState();
+      state.layers[1] = state.layers[0];
+      state.layers[1].layerId = 'second';
+      state.layers[2] = state.layers[0];
+      state.layers[2].layerId = 'third';
+      const newType = 'bar';
+      const newState = xyVisualization.switchVisualizationType!(newType, state);
+      expect((newState.layers[0] as XYDataLayerConfig).seriesType).toEqual(newType);
+      expect((newState.layers[1] as XYDataLayerConfig).seriesType).toEqual(newType);
+      expect((newState.layers[2] as XYDataLayerConfig).seriesType).toEqual(newType);
+    });
+    it('should switch only the second layer to the new visualization type if layerId is specified (chart switch case)', () => {
+      const state = exampleState();
+      state.layers[1] = { ...state.layers[0] };
+      state.layers[1].layerId = 'second';
+      state.layers[2] = { ...state.layers[0] };
+      state.layers[2].layerId = 'third';
+      const newType = 'bar';
+      const newState = xyVisualization.switchVisualizationType!(newType, state, 'first');
+      expect((newState.layers[0] as XYDataLayerConfig).seriesType).toEqual(newType);
+      expect((newState.layers[1] as XYDataLayerConfig).seriesType).toEqual('area');
+      expect((newState.layers[2] as XYDataLayerConfig).seriesType).toEqual('area');
+    });
+  });
 });

x-pack/plugins/lens/public/visualizations/xy/visualization.tsx

@@ -263,14 +263,15 @@ export const getXyVisualization = ({
   getDescription,
 
   switchVisualizationType(seriesType: string, state: State, layerId?: string) {
-    const dataLayer = state.layers.find((l) => l.layerId === layerId);
+    const dataLayer = layerId
+      ? state.layers.find((l) => l.layerId === layerId)
+      : state.layers.at(0);
     if (dataLayer && !isDataLayer(dataLayer)) {
       throw new Error('Cannot switch series type for non-data layer');
     }
     if (!dataLayer) {
       return state;
     }
-    // todo: test how they switch between percentage etc
     const currentStackingType = stackingTypes.find(({ subtypes }) =>
       subtypes.includes(dataLayer.seriesType)
     );