App.js

import React, { useState, useEffect } from "react";
import { View, Text, StyleSheet, Platform } from "react-native";
import { Focus } from "./src/features/focus/Focus";
import { Timer } from "./src/features/timer/Timer";
import { colors } from "./src/utils/colors";
import { spacing } from "./src/utils/sizes";

const STATUSES = {
  COMPLETE: 1,
  CANCELED: 2,
};

export default function App() {
  const [focusSubject, setFocusSubject] = useState(null);
  const [focusHistory, setFocusHistory] = useState([]);

  const addFocusHistorySubjectWithState = (subject, status) => {
    setFocusHistory([...focusHistory, { subject: subject, status }]);
  };

  return (
    <View style={styles.container}>
      {focusSubject ? (
        <Timer
          focusSubject={focusSubject}
          onTimerEnd={() => {
            addFocusHistorySubjectWithState(focusSubject, STATUSES.COMPLETE);
            setFocusSubject(null);
          }}
          clearSubject={() => {
            addFocusHistorySubjectWithState(focusSubject, STATUSES.CANCELED);
            setFocusSubject(null);
          }}
        />
      ) : (
        <Focus addSubject={setFocusSubject} />
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    paddingTop: Platform.OS === "ios" ? spacing.md : spacing.lg,
    backgroundColor: colors.darkBlue,
  },
});