ui: Gradual deprecation of old StateChart interface (#13604)

ui/packages/consul-ui/app/components/state-chart/README.mdx

@@ -3,6 +3,8 @@ class: ember
 ---
 # StateChart
 
+**This component is deprecated and is currently undergoing an interface change in <StateMachine />**
+
 ```hbs
 <StateChart
   @chart={{xstateStateChartObject}}

ui/packages/consul-ui/app/components/state-machine/README.mdx

@@ -0,0 +1,61 @@
+---
+class: ember
+---
+# StateMachine
+
+```hbs
+<StateMachine
+  @chart={{xstateStateChartObject}}
+  as |fsm|>
+</StateMachine>
+```
+
+`<StateMachine />` is a renderless component that eases rendering of different states
+from within templates using XState State Machine and Statechart objects.
+
+**Please note**: This component is currently a gradual replacement for
+StateChart, which has a less ergonmic interface. Guard and Action component are
+currently omitted due to a preference to use entries to define those instead of
+components (which is WIP)
+
+### Arguments
+
+| Argument/Attribute | Type | Default | Description |
+| --- | --- | --- | --- |
+| `chart` | `object` |  | An xstate statechart/state machine object |
+| `initial` | `String` | The initial value of the state chart itself | The initial state of the machine/chart (defaults to whatever is defined on the object itself) |
+
+The component currently yields 1 contextual components:
+
+- `<fsm.State />`: Used for rendering matching certain states ([also see State Component](../state/README.mdx))
+
+and 2 further objects:
+
+- `fsm.dispatch`: An action to dispatch an xstate event
+- `fsm.state`: The state object itself for usage in the `state-matches` helper
+
+### Example
+
+```hbs
+<StateMachine
+  @chart={{xstateStateChartObject}}
+  as |fsm|>
+    <fsm.State @matches="idle">
+      Currently Idle
+    </fsm.State>
+    <fsm.State @matches="loading">
+      Currently Loading
+    </fsm.State>
+    <fsm.State @matches={{array 'loading' 'idle'}}>
+      Idle and loading
+      <button disabled={{state-matches fsm.state "loading"}} onclick={{action fsm.dispatch "START"}}>Load</button>
+    </fsm.State>
+</StateMachine>
+```
+
+### See
+
+- [Component Source Code](./index.js)
+- [Template Source Code](./index.hbs)
+
+---

ui/packages/consul-ui/app/components/state-machine/index.hbs

@@ -0,0 +1,7 @@
+{{yield
+  (hash
+    State=(component 'state' state=this.state)
+    dispatch=(action 'dispatch')
+    state=this.state
+  )
+}}

ui/packages/consul-ui/app/components/state-machine/index.js

@@ -0,0 +1,4 @@
+import Component from '../state-chart/index';
+
+export default Component.extend({});
+

ui/packages/consul-ui/app/components/state/README.mdx

@@ -1,6 +1,3 @@
----
-class: ember
----
 # State
 
 `<State @state={{matchableStateObject}} @matches="idle">Currently Idle</State>`

ui/packages/consul-ui/app/components/state/index.hbs

@@ -1,3 +1,5 @@
-{{#if rendering}}
+{{did-insert this.attributeChanged @state @matches @notMatches}}
+{{did-update this.attributeChanged @state @matches @notMatches}}
+{{#if render}}
   {{yield}}
 {{/if}}

ui/packages/consul-ui/app/components/state/index.js

@@ -1,20 +1,20 @@
-import Component from '@ember/component';
-import { set } from '@ember/object';
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
 import { inject as service } from '@ember/service';
 
-export default Component.extend({
-  service: service('state'),
-  tagName: '',
-  didReceiveAttrs: function() {
-    if (typeof this.state === 'undefined') {
+export default class State extends Component {
+  @service('state') state;
+
+  @tracked render = false;
+
+  @action
+  attributeChanged([state, matches, notMatches]) {
+    if (typeof state === 'undefined') {
       return;
     }
-    let match = true;
-    if (typeof this.matches !== 'undefined') {
-      match = this.service.matches(this.state, this.matches);
-    } else if (typeof this.notMatches !== 'undefined') {
-      match = !this.service.matches(this.state, this.notMatches);
+    this.render = typeof matches !== 'undefined' ?
+      this.state.matches(state, matches) :
+      !this.state.matches(state, notMatches);
+  }
 }
-    set(this, 'rendering', match);
-  },
-});

ui/packages/consul-ui/app/helpers/require.js

@@ -1,27 +1,11 @@
 import { helper } from '@ember/component/helper';
+import require from 'require';
 
 import { css } from '@lit/reactive-element';
-
 import resolve from 'consul-ui/utils/path/resolve';
 
 
-import panel from 'consul-ui/components/panel/index.css';
-import distributionMeter from 'consul-ui/components/distribution-meter/index.css';
-import distributionMeterMeter from 'consul-ui/components/distribution-meter/meter/index.css';
-import distributionMeterMeterElement from 'consul-ui/components/distribution-meter/meter/element';
-import visuallyHidden from 'consul-ui/styles/base/decoration/visually-hidden.css';
-import baseKeyframes from 'consul-ui/styles/base/icons/base-keyframes.css';
-import chevronDown from 'consul-ui/styles/base/icons/icons/chevron-down/index.css';
-
-const fs = {
-  ['/components/panel/index.css']: panel,
-  ['/components/distribution-meter/index.css']: distributionMeter,
-  ['/components/distribution-meter/meter/index.css']: distributionMeterMeter,
-  ['/components/distribution-meter/meter/element']: distributionMeterMeterElement,
-  ['/styles/base/decoration/visually-hidden.css']: visuallyHidden,
-  ['/styles/base/icons/base-keyframes.css']: baseKeyframes,
-  ['/styles/base/icons/icons/chevron-down/index.css']: chevronDown
-};
+const appName = 'consul-ui';
 
 const container = new Map();
 
@@ -29,17 +13,27 @@ const container = new Map();
 // we get the advantage of laziness here, i.e. we only call css as and when we
 // need to
 export default helper(([path = ''], { from }) => {
-  const fullPath = resolve(from, path);
+  const fullPath = resolve(`${appName}${from}`, path);
+
+  let module;
+  if(require.has(fullPath)) {
+    module = require(fullPath).default;
+  } else {
+    throw new Error(`Unable to resolve '${fullPath}' does the file exist?`)
+  }
+
   switch(true) {
     case fullPath.endsWith('.css'):
-      return fs[fullPath](css)
+      return module(css);
+    case fullPath.endsWith('.xstate'):
+      return module;
     default: {
       if(container.has(fullPath)) {
         return container.get(fullPath);
       }
-      const module = fs[fullPath](HTMLElement);
-      container.set(fullPath, module);
-      return module;
+      const component = module(HTMLElement);
+      container.set(fullPath, component);
+      return component;
     }
   }
 });