App.js

import React, { useState, useEffect } from "react";
import { View, 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";
import AsyncStorage from "@react-native-async-storage/async-storage";

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

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

  const addFocusHistorySubjectWithStatus = (subject, status) => {
    setFocusHistory([
      ...focusHistory,
      { key: String(focusHistory.length + 1), subject, status },
    ]);
  };

  const saveFocusHistory = async () => {
    try {
      await AsyncStorage.setItem("focusHistory", JSON.stringify(focusHistory));
    } catch (e) {
      console.log(e);
    }
  };

  const loadFocusHistory = async () => {
    try {
      const history = await AsyncStorage.getItem("focusHistory");
      if (history && JSON.parse(history).length) {
        setFocusHistory(JSON.parse(history));
      }
    } catch (e) {
      console.log(e);
    }
  };

  useEffect(() => {
    (async () => {
      await loadFocusHistory();
    })();
  }, []);

  useEffect(() => {
    saveFocusHistory(focusHistory);
  }, [focusHistory]);

  return (
    <View style={styles.container}>
      {focusSubject ? (
        <Timer
          focusSubject={focusSubject}
          onTimerEnd={() => {
            addFocusHistorySubjectWithStatus(focusSubject, STATUSES.COMPLETE);
            setFocusSubject(null);
          }}
          clearSubject={() => {
            addFocusHistorySubjectWithStatus(focusSubject, STATUSES.CANCELLED);
            setFocusSubject(null);
          }}
        />
      ) : (
        <View style={{ flex: 1 }}>
          <Focus addSubject={setFocusSubject} />
        </View>
      )}
    </View>
  );
}

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