covered solution with tests

.gitignore

@@ -1,3 +1,5 @@
 .idea/*
 *.iml
 target/*
+**/.DS_Store
+

src/main/java/core/basesyntax/Main.java

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+package core.basesyntax;
+
+import core.basesyntax.dao.StorageDao;
+import core.basesyntax.dao.StorageDaoImpl;
+import core.basesyntax.model.Operation;
+import core.basesyntax.service.DataProcessing;
+import core.basesyntax.service.DataReader;
+import core.basesyntax.service.OperationHandler;
+import core.basesyntax.service.ReportCreator;
+import core.basesyntax.service.Writer;
+import core.basesyntax.service.handler.impl.BalanceOperationHandler;
+import core.basesyntax.service.handler.impl.PurchaseOperationHandler;
+import core.basesyntax.service.handler.impl.ReturnOperationHandler;
+import core.basesyntax.service.handler.impl.SupplyOperationHandler;
+import core.basesyntax.service.impl.CsvWriter;
+import core.basesyntax.service.impl.DataProcessingImpl;
+import core.basesyntax.service.impl.DataReaderFromCsv;
+import core.basesyntax.service.impl.FruitShopServiceImpl;
+import core.basesyntax.service.impl.ReportCreatorImpl;
+import core.basesyntax.strategy.OperationStrategy;
+import core.basesyntax.strategy.impl.OperationStrategyImpl;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Main {
+    private static final String FILE_FROM = "src/main/resources/data.csv";
+    private static final String FILE_TO = "src/main/resources/report.csv";
+
+    public static void main(String[] args) {
+        StorageDao storageDao = new StorageDaoImpl();
+        Map<Operation, OperationHandler> operationHandlerMap = new HashMap<>();
+        operationHandlerMap.put(Operation.BALANCE,
+                new BalanceOperationHandler(storageDao));
+        operationHandlerMap.put(Operation.SUPPLY,
+                new SupplyOperationHandler(storageDao));
+        operationHandlerMap.put(Operation.PURCHASE,
+                new PurchaseOperationHandler(storageDao));
+        operationHandlerMap.put(Operation.RETURN,
+                new ReturnOperationHandler(storageDao));
+        OperationStrategy operationStrategy = new OperationStrategyImpl(operationHandlerMap);
+        DataReader dataReader = new DataReaderFromCsv();
+        DataProcessing dataProcessing = new DataProcessingImpl(operationStrategy);
+        ReportCreator reportCreator = new ReportCreatorImpl(storageDao);
+        Writer writer = new CsvWriter();
+        FruitShopServiceImpl fruitShopService = new FruitShopServiceImpl(dataReader,
+                dataProcessing, reportCreator, writer);
+        fruitShopService.createDailyReport(FILE_FROM, FILE_TO);
+    }
+}

src/main/java/core/basesyntax/dao/StorageDao.java

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+package core.basesyntax.dao;
+
+import core.basesyntax.model.Fruit;
+import java.util.Map;
+
+public interface StorageDao {
+    void add(Fruit fruit, Integer amount);
+
+    Map.Entry<Fruit, Integer> get(String name);
+
+    boolean isInStorage(String name);
+
+    Map<Fruit, Integer> getALl();
+}

src/main/java/core/basesyntax/dao/StorageDaoImpl.java

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+package core.basesyntax.dao;
+
+import core.basesyntax.db.Storage;
+import core.basesyntax.model.Fruit;
+import java.util.HashMap;
+import java.util.Map;
+
+public class StorageDaoImpl implements StorageDao {
+    @Override
+    public void add(Fruit fruit, Integer amount) {
+        Storage.fruits.put(fruit, amount);
+    }
+
+    @Override
+    public Map.Entry<Fruit, Integer> get(String name) {
+        for (Map.Entry<Fruit, Integer> entry : Storage.fruits.entrySet()) {
+            if (entry.getKey().getName().equals(name)) {
+                return entry;
+            }
+        }
+        return null;
+    }
+
+    public boolean isInStorage(String name) {
+        return (get(name) != null);
+    }
+
+    @Override
+    public Map<Fruit, Integer> getALl() {
+        return new HashMap<>(Storage.fruits);
+    }
+}

src/main/java/core/basesyntax/db/Storage.java

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+package core.basesyntax.db;
+
+import core.basesyntax.model.Fruit;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Storage {
+    public static final Map<Fruit, Integer> fruits = new HashMap<>();
+}

src/main/java/core/basesyntax/model/Fruit.java

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+package core.basesyntax.model;
+
+import java.util.Objects;
+
+public class Fruit {
+    private String name;
+
+    public Fruit(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Fruit fruit = (Fruit) o;
+        return Objects.equals(name, fruit.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+
+    @Override
+    public String toString() {
+        return "Fruit{" + "name='" + name + '\'' + '}';
+    }
+}

src/main/java/core/basesyntax/model/FruitTransaction.java

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+package core.basesyntax.model;
+
+public class FruitTransaction {
+    private Operation operation;
+    private String fruitName;
+    private int amount;
+
+    public Operation getOperation() {
+        return operation;
+    }
+
+    public void setOperation(Operation operation) {
+        this.operation = operation;
+    }
+
+    public String getFruitName() {
+        return fruitName;
+    }
+
+    public void setFruitName(String fruit) {
+        this.fruitName = fruit;
+    }
+
+    public int getAmount() {
+        return amount;
+    }
+
+    public void setAmount(int amount) {
+        this.amount = amount;
+    }
+}

src/main/java/core/basesyntax/model/Operation.java

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+package core.basesyntax.model;
+
+import java.util.Arrays;
+
+public enum Operation {
+    BALANCE("b"),
+    SUPPLY("s"),
+    PURCHASE("p"),
+    RETURN("r");
+
+    private String code;
+
+    Operation(String code) {
+        this.code = code;
+    }
+
+    public String getCodeOfOperation() {
+        return code;
+    }
+
+    public static Operation getOperationOf(String letter) {
+        return Arrays.stream(Operation.values())
+                .filter(o -> o.getCodeOfOperation().equals(letter))
+                .findFirst()
+                .orElseThrow(() -> new RuntimeException("There is no such operation by letter "
+                        + "'" + letter + "'"));
+    }
+}

src/main/java/core/basesyntax/service/DataProcessing.java

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+package core.basesyntax.service;
+
+import java.util.List;
+
+public interface DataProcessing {
+    void processTransaction(List<String> data);
+}

src/main/java/core/basesyntax/service/DataReader.java

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+package core.basesyntax.service;
+
+import java.util.List;
+
+public interface DataReader {
+    List<String> readData(String file);
+
+}

src/main/java/core/basesyntax/service/OperationHandler.java

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+package core.basesyntax.service;
+
+import core.basesyntax.model.FruitTransaction;
+
+public interface OperationHandler {
+    int MIN_AMOUNT = 0;
+
+    void updateStorage(FruitTransaction transaction);
+
+    default void validAmount(FruitTransaction transaction) {
+        if (transaction.getAmount() < MIN_AMOUNT) {
+            throw new RuntimeException("OPERATION " + transaction.getOperation()
+                    + "! Amount is less then zero!!!");
+        }
+    }
+}

src/main/java/core/basesyntax/service/ReportCreator.java

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+package core.basesyntax.service;
+
+public interface ReportCreator {
+    String createReport();
+}

src/main/java/core/basesyntax/service/Writer.java

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+package core.basesyntax.service;
+
+public interface Writer {
+    void writeReportToFile(String report, String toFile);
+}

src/main/java/core/basesyntax/service/handler/impl/BalanceOperationHandler.java

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+package core.basesyntax.service.handler.impl;
+
+import core.basesyntax.dao.StorageDao;
+import core.basesyntax.model.Fruit;
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.OperationHandler;
+
+public class BalanceOperationHandler implements OperationHandler {
+    private final StorageDao storageDao;
+
+    public BalanceOperationHandler(StorageDao storageDao) {
+        this.storageDao = storageDao;
+    }
+
+    @Override
+    public void updateStorage(FruitTransaction transaction) {
+        validAmount(transaction);
+        if (!storageDao.isInStorage(transaction.getFruitName())) {
+            storageDao.add(new Fruit(transaction.getFruitName()), transaction.getAmount());
+        }
+    }
+}

src/main/java/core/basesyntax/service/handler/impl/PurchaseOperationHandler.java

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+package core.basesyntax.service.handler.impl;
+
+import core.basesyntax.dao.StorageDao;
+import core.basesyntax.model.Fruit;
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.OperationHandler;
+import java.util.Map;
+
+public class PurchaseOperationHandler implements OperationHandler {
+    private final StorageDao storageDao;
+
+    public PurchaseOperationHandler(StorageDao storageDao) {
+        this.storageDao = storageDao;
+    }
+
+    @Override
+    public void updateStorage(FruitTransaction transaction) {
+        validAmountOfFruit(transaction);
+        Map.Entry<Fruit, Integer> fruitAndAmount = storageDao.get(transaction.getFruitName());
+        Integer fruitAmount = fruitAndAmount.getValue();
+        Integer fruitAmountFromTransaction = transaction.getAmount();
+        fruitAndAmount.setValue(fruitAmount - fruitAmountFromTransaction);
+
+    }
+
+    private void validAmountOfFruit(FruitTransaction transaction) {
+        validAmount(transaction);
+        if (!storageDao.isInStorage(transaction.getFruitName())) {
+            throw new RuntimeException("There is no such fruit!!!");
+        }
+        if (storageDao.get(transaction.getFruitName()).getValue() < transaction.getAmount()) {
+            throw new RuntimeException("Amount of " + transaction.getFruitName()
+                    + " isn't enough!!!");
+        }
+    }
+}

src/main/java/core/basesyntax/service/handler/impl/ReturnOperationHandler.java

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+package core.basesyntax.service.handler.impl;
+
+import core.basesyntax.dao.StorageDao;
+import core.basesyntax.model.Fruit;
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.OperationHandler;
+import java.util.Map;
+
+public class ReturnOperationHandler implements OperationHandler {
+    private final StorageDao storageDao;
+
+    public ReturnOperationHandler(StorageDao storageDao) {
+        this.storageDao = storageDao;
+    }
+
+    @Override
+    public void updateStorage(FruitTransaction transaction) {
+        validAmount(transaction);
+        if (!storageDao.isInStorage(transaction.getFruitName())) {
+            storageDao.add(new Fruit(transaction.getFruitName()), transaction.getAmount());
+        } else {
+            Map.Entry<Fruit, Integer> fruitAndAmount = storageDao.get(transaction.getFruitName());
+            Integer fruitAmount = fruitAndAmount.getValue();
+            Integer fruitAmountFromTransaction = transaction.getAmount();
+            fruitAndAmount.setValue(fruitAmount + fruitAmountFromTransaction);
+        }
+    }
+}

src/main/java/core/basesyntax/service/handler/impl/SupplyOperationHandler.java

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+package core.basesyntax.service.handler.impl;
+
+import core.basesyntax.dao.StorageDao;
+import core.basesyntax.model.Fruit;
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.OperationHandler;
+import java.util.Map;
+
+public class SupplyOperationHandler implements OperationHandler {
+    private final StorageDao storageDao;
+
+    public SupplyOperationHandler(StorageDao storageDao) {
+        this.storageDao = storageDao;
+    }
+
+    @Override
+    public void updateStorage(FruitTransaction transaction) {
+        validAmount(transaction);
+        if (!storageDao.isInStorage(transaction.getFruitName())) {
+            storageDao.add(new Fruit(transaction.getFruitName()), transaction.getAmount());
+        } else {
+            Map.Entry<Fruit, Integer> fruitAndAmount = storageDao.get(transaction.getFruitName());
+            Integer fruitAmount = fruitAndAmount.getValue();
+            Integer fruitAmountFromTransaction = transaction.getAmount();
+            fruitAndAmount.setValue(fruitAmount + fruitAmountFromTransaction);
+        }
+    }
+}