Improve tray handling

Fix bugs when the tray is not fully filled, and retain custom
user tray ordering between turns.

ui/src/elements.tsx

@@ -2,6 +2,10 @@ import * as React from "react";
 import {GameWasm, Letter as LetterData, MyResult, PlayedTile, PlayerAndScore, Tray, WordResult} from "word_grid";
 import {ChangeEvent, JSX, useEffect, useMemo, useReducer, useState} from "react";
 
+export interface Settings {
+    trayLength: number;
+}
+
 export enum LocationType {
     GRID,
     TRAY
@@ -63,7 +67,7 @@ function matchCoordinate(playerLetters: PlayableLetterData[], coords: Coordinate
     for (let i=0; i<playerLetters.length; i++){
         let letter = playerLetters[i];
 
-        if (letter.location === coords.location && letter.index === coords.index) {
+        if (letter !== undefined && letter.location === coords.location && letter.index === coords.index) {
             return i;
         }
     }
@@ -86,7 +90,7 @@ function addLogInfo(existingLog: React.JSX.Element[], newItem: React.JSX.Element
     return existingLog.slice();
 }
 
-export function Game(props: {wasm: GameWasm}) {
+export function Game(props: {wasm: GameWasm, settings: Settings}) {
 
     const cellTypes = useMemo(() => {
         return props.wasm.get_board_cell_types();
@@ -99,12 +103,46 @@ export function Game(props: {wasm: GameWasm}) {
         if(update.action === TileDispatchActionType.RETRIEVE) {
             let tray: Tray = props.wasm.get_tray("Player");
 
+
+            // we may need to check against the existing tray to retain whatever user reorderings there are
+            const freeSpots = new Array<number | null>();
+            for (let i = 0; i<props.settings.trayLength; i++) {
+                freeSpots.push(i);
+            }
+
+            playerLetters.filter((x) => {
+                return x !== undefined && x !== null;
+            }).forEach((x) => {
+                if (x.location === LocationType.TRAY) {
+                    freeSpots[x.index] = null;
+                }
+            });
+
+            const firstNotNull = (): number => {
+                for (let i of freeSpots) {
+                    if (i !== null) {
+                        freeSpots[i] = null;
+                        return i;
+                    }
+                }
+
+                return null;
+            }
+
             // initial state
             let letters: PlayableLetterData[] = tray.letters.map((ld, i) => {
+                if(ld !== undefined) {
                     ld["location"] = LocationType.TRAY;
-                ld["index"] = i;
+
+                    if (playerLetters[i] !== undefined && playerLetters[i] !== null && playerLetters[i].location === LocationType.TRAY) {
+                        ld["index"] = playerLetters[i].index;
+                    } else {
+                        ld["index"] = firstNotNull();
+                    }
+                }
                 return ld as PlayableLetterData;
-            })
+            });
+
             return letters;
         } else if (update.action === TileDispatchActionType.MOVE) {
 
@@ -175,7 +213,7 @@ export function Game(props: {wasm: GameWasm}) {
             </div>
         </div>
 
-        <TileTray letters={playerLetters} trayLength={7} dispatch={trayDispatch}/>
+        <TileTray letters={playerLetters} trayLength={props.settings.trayLength} dispatch={trayDispatch}/>
         <button onClick={(e) => {
             const playedTiles = playerLetters.map((i) => {
                 if (i === undefined) {
@@ -322,7 +360,9 @@ export function TileTray(props: { letters: Array<PlayableLetterData>, trayLength
         );
     }
 
-    props.letters.forEach((letter, i) => {
+    props.letters
+        .filter((x) => {return x !== undefined;})
+        .forEach((letter, i) => {
         if (letter.location === LocationType.TRAY) {
             elements[letter.index] =
                 <TileSlot
@@ -373,7 +413,9 @@ function Grid(props: {
         </div>;
     });
 
-    props.playerLetters.forEach((letter, i) => {
+    props.playerLetters
+        .filter((letter) => {return letter !== undefined})
+        .forEach((letter, i) => {
         if (letter.location === LocationType.GRID) {
             const ct = props.cellTypes[letter.index];
             const {className, text} = cell_type_to_details(ct);

ui/src/index.tsx

@@ -53,7 +53,7 @@ async function run() {
     console.log({cellTypes});
 
     const root = createRoot(document.getElementById("root"));
-    root.render(<Game wasm={game} />);
+    root.render(<Game wasm={game} settings={{trayLength: 7}} />);
 
 }