remember a shuffle seed to remain page reload

apiGo/api/Video.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"fmt"
+	"math/rand"
 	"net/url"
 	"openmediacenter/apiGo/api/api"
 	"openmediacenter/apiGo/api/types"
@@ -163,18 +164,25 @@ func getVideoHandlers() {
 	api.AddHandler("getRandomMovies", api.VideoNode, api.PermUser, func(context api.Context) {
 		var args struct {
 			Number int
+			Seed   *int
 		}
 		if api.DecodeRequest(context.GetRequest(), &args) != nil {
 			context.Text("unable to decode request")
 			return
 		}
 
+		// if Seed argument not passed generate random seed
+		if args.Seed == nil {
+			r := rand.Int()
+			args.Seed = &r
+		}
+
 		var result struct {
 			Tags   []types.Tag
 			Videos []types.VideoUnloadedType
 		}
 
-		query := fmt.Sprintf("SELECT movie_id,movie_name FROM videos ORDER BY RAND() LIMIT %d", args.Number)
+		query := fmt.Sprintf("SELECT movie_id,movie_name FROM videos ORDER BY RAND(%d) LIMIT %d", *args.Seed, args.Number)
 		result.Videos = readVideosFromResultset(database.Query(query))
 
 		var ids string

src/pages/HomePage/HomePage.test.js

@@ -90,14 +90,12 @@ describe('<HomePage/>', function () {
         const wrapper = shallow(<HomePage/>);
 
         // expect those default values
-        expect(wrapper.state().sortby).toBe('Date Added');
-        expect(wrapper.instance().sortState).toBe(SortBy.date);
+        expect(wrapper.state().sortby).toBe(0);
         expect(wrapper.instance().tagState).toBe(DefaultTags.all);
 
-        wrapper.instance().onDropDownItemClick(SortBy.name, 'namesort');
+        wrapper.instance().onDropDownItemClick(SortBy.name);
 
-        expect(wrapper.state().sortby).toBe('namesort');
-        expect(wrapper.instance().sortState).toBe(SortBy.name);
+        expect(wrapper.state().sortby).toBe(SortBy.name);
     });
 });
 

src/pages/RandomPage/RandomPage.tsx

@@ -25,9 +25,18 @@ interface GetRandomMoviesType {
 class RandomPage extends React.Component<{}, state> {
     readonly LoadNR = 3;
 
+    // random seed to load videos, remains page reload.
+    seed = this.genRandInt();
+
     constructor(props: {}) {
         super(props);
 
+        // get previously stored location from localstorage
+        const storedseed = global.localStorage.getItem('randpageseed');
+        if (storedseed != null) {
+            this.seed = parseInt(storedseed, 10);
+        }
+
         this.state = {
             videos: [],
             tags: []
@@ -36,6 +45,10 @@ class RandomPage extends React.Component<{}, state> {
         this.keypress = this.keypress.bind(this);
     }
 
+    genRandInt(): number {
+        return Math.floor(Math.random() * 2147483647) + 1;
+    }
+
     componentDidMount(): void {
         addKeyHandler(this.keypress);
 
@@ -77,15 +90,21 @@ class RandomPage extends React.Component<{}, state> {
      * click handler for shuffle btn
      */
     shuffleclick(): void {
+        this.genSeed();
         this.loadShuffledvideos(this.LoadNR);
     }
 
+    genSeed(): void {
+        this.seed = this.genRandInt();
+        global.localStorage.setItem('randpageseed', this.seed.toString());
+    }
+
     /**
      * load random videos from backend
      * @param nr number of videos to load
      */
     loadShuffledvideos(nr: number): void {
-        callAPI<GetRandomMoviesType>(APINode.Video, {action: 'getRandomMovies', Number: nr}, (result) => {
+        callAPI<GetRandomMoviesType>(APINode.Video, {action: 'getRandomMovies', Number: nr, Seed: this.seed}, (result) => {
             this.setState({videos: []}); // needed to trigger rerender of main videoview
             this.setState({
                 videos: result.Videos,
@@ -101,7 +120,8 @@ class RandomPage extends React.Component<{}, state> {
     private keypress(event: KeyboardEvent): void {
         // bind s to shuffle
         if (event.key === 's') {
-            this.loadShuffledvideos(4);
+            this.genSeed();
+            this.loadShuffledvideos(this.LoadNR);
         }
     }
 }