initial working feature

app/index.tsx

@@ -2,10 +2,13 @@ import React, { useState } from "react";
 import { ScrollView, Text, Alert, Button } from "react-native";
 import PlayerSelector from "@/components/PlayerSelector";
 import BuyInSelector from "@/components/BuyInSelector";
+import ChipsSelector from "@/components/ChipsSelector";
 
 const IndexScreen = () => {
   const [playerCount, setPlayerCount] = useState(2);
   const [buyInAmount, setBuyInAmount] = useState<number | null>(null);
+  const [numberOfChips, setNumberOfChips] = useState<number>(5);
+  const [totalChipsCount, setTotalChipsCount] = useState<number[]>([]);
 
   const handleSave = () => {
     if (buyInAmount === null) {
@@ -26,6 +29,13 @@ const IndexScreen = () => {
 
       <BuyInSelector setBuyInAmount={setBuyInAmount} />
 
+      <ChipsSelector
+        totalChipsCount={totalChipsCount}
+        setTotalChipsCount={setTotalChipsCount}
+        numberOfChips={numberOfChips}
+        setNumberOfChips={setNumberOfChips}
+      />
+
       <Button
         title="Save"
         onPress={handleSave}

components/ChipsSelector.tsx

@@ -0,0 +1,159 @@
+import React, { useCallback, useEffect, useMemo, useState } from "react";
+import {
+  View,
+  Text,
+  TextInput,
+  TouchableOpacity,
+  StyleSheet,
+  Button,
+  ColorValue,
+  Modal,
+} from "react-native";
+const colors: ColorValue[] = ["white", "red", "green", "blue", "black"];
+
+const ChipInputModal = ({
+  showModal,
+  setShowModal,
+  totalChipsCount,
+  update,
+}: {
+  showModal: [boolean, ColorValue];
+  setShowModal: React.Dispatch<React.SetStateAction<[boolean, ColorValue]>>;
+  totalChipsCount: number[];
+  update: Function;
+}) => {
+  const color: ColorValue = useMemo(() => showModal[1], [showModal]);
+  const colorIdx = useMemo(() => colors.indexOf(color), [color]);
+
+  const value: number = useMemo(
+    () => totalChipsCount[colorIdx],
+    [totalChipsCount, colorIdx]
+  );
+
+  return (
+    <Modal
+      visible={showModal[0]}
+      onRequestClose={() => setShowModal([false, color])}
+    >
+      <Text>Number of {showModal[1]?.toString()} chips</Text>
+      <TextInput
+        style={{ color: showModal[1] }}
+        keyboardType="numeric"
+        value={value.toString()}
+        onChangeText={(v) => {
+          const n = parseInt(v);
+          update(showModal[1], Number.isNaN(n) ? 0 : n);
+        }}
+      />
+      <Button title="Accept" onPress={() => setShowModal([false, color])} />
+    </Modal>
+  );
+};
+
+const Chip = ({
+  color,
+  count,
+  setShowModal,
+}: {
+  color: ColorValue;
+  count: number;
+  setShowModal: React.Dispatch<React.SetStateAction<[boolean, ColorValue]>>;
+}) => {
+  return (
+    <Text
+      key={color.toString()}
+      onPress={() => setShowModal([true, color])}
+      style={[{ color: color }, styles.chip]}
+    >
+      {count}
+    </Text>
+  );
+};
+
+const ChipsSelector = ({
+  numberOfChips,
+  totalChipsCount,
+  setTotalChipsCount,
+  setNumberOfChips,
+}: {
+  numberOfChips: number;
+  totalChipsCount: number[];
+  setTotalChipsCount: React.Dispatch<React.SetStateAction<number[]>>;
+  setNumberOfChips: React.Dispatch<React.SetStateAction<number>>;
+}) => {
+  const [showModal, setShowModal] = useState<[boolean, ColorValue]>([
+    false,
+    colors[0],
+  ]);
+  const colorsUsed = useMemo(
+    () => colors.filter((v, i) => i < numberOfChips),
+    [numberOfChips]
+  );
+
+  const update = useCallback(
+    (color: ColorValue, count: number) => {
+      const newTotalChipsCount = totalChipsCount.slice();
+      const colorIndex = colors.indexOf(color.toString());
+      newTotalChipsCount[colorIndex] = count;
+      setTotalChipsCount(newTotalChipsCount);
+    },
+    [numberOfChips, totalChipsCount, setTotalChipsCount]
+  );
+  useEffect(() => {
+    if (numberOfChips !== totalChipsCount.length) {
+      let newTotalChipsCount = totalChipsCount.slice();
+
+      if (numberOfChips < totalChipsCount.length) {
+        newTotalChipsCount = newTotalChipsCount.slice(0, numberOfChips);
+      } else if (numberOfChips > totalChipsCount.length) {
+        for (let colorIndex = 0; colorIndex < numberOfChips; ++colorIndex) {
+          if (colorIndex >= newTotalChipsCount.length) {
+            const defaultTotal = 100 - colorIndex * 20;
+            newTotalChipsCount.push(defaultTotal);
+          }
+        }
+      }
+      setTotalChipsCount(newTotalChipsCount);
+    }
+  }, [numberOfChips]);
+
+  return (
+    <>
+      <View style={styles.container}>
+        {colorsUsed.map((color) => (
+          <Chip
+            key={color.toString()}
+            color={color}
+            count={totalChipsCount[colors.indexOf(color)] ?? 0}
+            setShowModal={setShowModal}
+          />
+        ))}
+      </View>
+
+      <ChipInputModal
+        showModal={showModal}
+        setShowModal={setShowModal}
+        totalChipsCount={totalChipsCount}
+        update={update}
+      />
+    </>
+  );
+};
+
+const styles = StyleSheet.create({
+  container: {
+    padding: 20,
+    display: "flex",
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "space-between",
+    backgroundColor: "#ddd",
+  },
+  chip: {
+    // backgroundColor: "blue",
+    textAlign: "center",
+    fontSize: 16,
+    fontWeight: "bold",
+  },
+});
+export default ChipsSelector;