Refactor share sheet selection

Summary:
We're if-ing over an enum, so this should be a switch.
Also removed the edge case for the share sheet and
made the error handling part of the component so the
user actually sees it.

Reviewed By: jknoxville

Differential Revision: D15853056

fbshipit-source-id: 241ed0f2e042b08c4c157db9616175297b683ac3

src/App.js

@@ -26,6 +26,7 @@ import {
   ACTIVE_SHEET_SHARE_DATA,
   ACTIVE_SHEET_SIGN_IN,
   ACTIVE_SHEET_SHARE_DATA_IN_FILE,
+  ACTIVE_SHEET_PLUGIN_SHEET,
 } from './reducers/application.js';
 
 import type {Logger} from './fb-interfaces/Logger.js';
@@ -66,27 +67,28 @@ export class App extends React.Component<Props> {
   }
 
   getSheet = (onHide: () => mixed) => {
-    if (this.props.activeSheet === ACTIVE_SHEET_BUG_REPORTER) {
+    switch (this.props.activeSheet) {
+      case ACTIVE_SHEET_BUG_REPORTER:
         return (
           <BugReporterDialog
             bugReporter={this.props.bugReporter}
             onHide={onHide}
           />
         );
-    } else if (this.props.activeSheet === ACTIVE_SHEET_PLUGIN_DEBUGGER) {
+      case ACTIVE_SHEET_PLUGIN_DEBUGGER:
         return <PluginDebugger onHide={onHide} />;
-    } else if (this.props.activeSheet === ACTIVE_SHEET_SHARE_DATA) {
+      case ACTIVE_SHEET_SHARE_DATA:
         return <ShareSheet onHide={onHide} />;
-    } else if (this.props.activeSheet === ACTIVE_SHEET_SIGN_IN) {
+      case ACTIVE_SHEET_SIGN_IN:
         return <SignInSheet onHide={onHide} />;
-    } else if (this.props.activeSheet === ACTIVE_SHEET_SHARE_DATA_IN_FILE) {
-      const {exportFile} = this.props;
-      if (!exportFile) {
-        throw new Error('Tried to export data without passing the file path');
-      }
-      return <ShareSheetExportFile onHide={onHide} file={exportFile} />;
-    } else {
-      // contents are added via React.Portal
+      case ACTIVE_SHEET_SHARE_DATA_IN_FILE:
+        return (
+          <ShareSheetExportFile onHide={onHide} file={this.props.exportFile} />
+        );
+      case ACTIVE_SHEET_PLUGIN_SHEET:
+        // Currently unused.
+        return null;
+      default:
         return null;
     }
   };

src/chrome/ShareSheetExportFile.js

@@ -65,7 +65,7 @@ const Padder = styled('div')(
 
 type Props = {
   onHide: () => mixed,
-  file: string,
+  file: ?string,
 };
 type State = {
   errorArray: Array<Error>,
@@ -86,6 +86,10 @@ export default class ShareSheetExportFile extends Component<Props, State> {
   };
 
   async componentDidMount() {
+    if (!this.props.file) {
+      return;
+    }
+
     try {
       const {errorArray} = await reportPlatformFailures(
         exportStoreToFile(this.props.file, this.context.store),
@@ -98,6 +102,10 @@ export default class ShareSheetExportFile extends Component<Props, State> {
   }
 
   render() {
+    if (!this.props.file) {
+      return this.renderNoFileError();
+    }
+
     const {result} = this.state;
     if (result) {
       const {success, error} = result;
@@ -161,4 +169,20 @@ export default class ShareSheetExportFile extends Component<Props, State> {
       );
     }
   }
+
+  renderNoFileError() {
+    return (
+      <Container>
+        <Center>
+          <Title bold>No file selected</Title>
+        </Center>
+        <FlexRow>
+          <Spacer />
+          <Button compact padded onClick={this.props.onHide}>
+            Close
+          </Button>
+        </FlexRow>
+      </Container>
+    );
+  }
 }