package org.infinispan.functional;

import static org.infinispan.test.Exceptions.expectExceptionNonStrict;
import static org.testng.AssertJUnit.assertEquals;
import static org.testng.AssertJUnit.assertNull;
import static org.testng.AssertJUnit.assertTrue;

import java.util.Collections;
import java.util.NoSuchElementException;
import java.util.Optional;
import java.util.concurrent.CompletionException;
import java.util.stream.IntStream;

import javax.transaction.Status;
import javax.transaction.TransactionManager;

import org.infinispan.commons.CacheException;
import org.infinispan.marshall.core.MarshallableFunctions;
import org.infinispan.test.TestingUtil;
import org.infinispan.transaction.LockingMode;
import org.infinispan.util.concurrent.IsolationLevel;
import org.infinispan.util.function.SerializableFunction;
import org.testng.Assert;
import org.testng.annotations.Test;

@Test(groups = "functional", testName = "functional.FunctionalTxInMemoryTest")
public class FunctionalTxInMemoryTest extends FunctionalInMemoryTest {
   private static final int NUM_KEYS = 2;
   private static final Integer[] INT_KEYS = IntStream.range(0, NUM_KEYS).mapToObj(Integer::valueOf).toArray(Integer[]::new);
   TransactionManager tm;

   @Override
   public Object[] factory() {
      return new Object[]{
            new FunctionalTxInMemoryTest().transactional(true).lockingMode(LockingMode.OPTIMISTIC).isolationLevel(IsolationLevel.READ_COMMITTED),
            new FunctionalTxInMemoryTest().transactional(true).lockingMode(LockingMode.PESSIMISTIC).isolationLevel(IsolationLevel.READ_COMMITTED),
            new FunctionalTxInMemoryTest().transactional(true).lockingMode(LockingMode.PESSIMISTIC).isolationLevel(IsolationLevel.REPEATABLE_READ),
      };
   }

   @Override
   protected void createCacheManagers() throws Throwable {
      super.createCacheManagers();
      tm = TestingUtil.extractComponentRegistry(cache(0)).getComponent(TransactionManager.class);
   }

   @Test(dataProvider = "owningModeAndReadMethod")
   public void testReadLoads(boolean isOwner, ReadMethod method) throws Exception {
      Object[] keys = getKeys(isOwner, NUM_KEYS);
      for (Object key : keys) {
         cache(0, DIST).put(key, key);
      }
      tm.begin();
      for (Object key : keys) {
         assertEquals(method.eval(key, ro, e -> {
            assertTrue(e.find().isPresent());
            assertEquals(e.get(), e.key());
            return "OK";
         }), "OK");
      }
      tm.commit();
   }

   @Test(dataProvider = "readMethods")
   public void testReadLoadsLocal(ReadMethod method) throws Exception {
      Integer[] keys = INT_KEYS;
      for (Integer key : keys) {
         cache(0).put(key, key);
      }
      tm.begin();
      for (Integer key : keys) {
         assertEquals(method.eval(key, lro, e -> {
            assertTrue(e.find().isPresent());
            assertEquals(e.get(), e.key());
            return "OK";
         }), "OK");
      }
      tm.commit();
   }

   @Test(dataProvider = "owningModeAndReadMethod")
   public void testReadsAfterMods(boolean isOwner, ReadMethod method) throws Exception {
      Object KEY = getKey(isOwner, DIST);
      cache(0, DIST).put(KEY, "a");

      tm.begin();
      assertEquals("a", rw.eval(KEY, append("b")).join());
      assertEquals("ab", rw.evalMany(Collections.singleton(KEY), append("c")).findAny().get());
      assertEquals(null, rw.eval("otherKey", append("d")).join());
      assertEquals("abc", method.eval(KEY, ro, MarshallableFunctions.returnReadOnlyFindOrNull()));
      tm.commit();
   }

   @Test(dataProvider = "owningModeAndReadWrites")
   public void testReadWriteAfterMods(boolean isOwner, WriteMethod method) throws Exception {
      Object KEY = getKey(isOwner, DIST);
      cache(0, DIST).put(KEY, "a");

      tm.begin();
      assertEquals("a", rw.eval(KEY, append("b")).join());
      assertEquals("ab", rw.evalMany(Collections.singleton(KEY), append("c")).findAny().get());
      assertEquals(null, rw.eval("otherKey", append("d")).join());
      assertEquals("abc", method.eval(KEY, wo, rw,
            MarshallableFunctions.returnReadOnlyFindOrNull(),
            (e, prev) -> {}, getClass()));
      tm.commit();
   }

   public void testNonFunctionalReadsAfterMods() throws Exception {
      Object KEY = getKey(false, DIST);
      cache(0, DIST).put(KEY, "a");

      tm.begin();
      assertEquals("a", rw.eval(KEY, append("b")).join());
      assertEquals("ab", cache.get(KEY));
      // try second time to make sure the modification is not applied twice
      assertEquals("ab", cache.get(KEY));
      tm.commit();

      tm.begin();
      assertEquals("ab", rw.evalMany(Collections.singleton(KEY), append("c")).findAny().get());
      assertEquals("abc", cache.put(KEY, "abcd"));
      tm.commit();

      tm.begin();
      assertEquals("abcd", cache.get(KEY));
      tm.commit();

      tm.begin();
      wo.eval(KEY, "x", MarshallableFunctions.setValueConsumer()).join();
      assertEquals("x", cache.putIfAbsent(KEY, "otherValue"));
      tm.commit();

      tm.begin();
      wo.eval(KEY, MarshallableFunctions.removeConsumer()).join();
      assertNull(cache.putIfAbsent(KEY, "y"));
      assertEquals("y", ro.eval(KEY, MarshallableFunctions.returnReadOnlyFindOrNull()).join());
      tm.commit();

      tm.begin();
      assertEquals("y", rw.eval(KEY, "z", MarshallableFunctions.setValueReturnPrevOrNull()).join());
      assertTrue(cache.replace(KEY, "z", "a"));
      tm.commit();

      tm.begin();
      assertEquals("a", rw.eval(KEY, append("b")).join());
      assertEquals("ab", cache.getAll(Collections.singleton(KEY)).get(KEY));
      tm.commit();
   }

   @Test(dataProvider = "owningModeAndReadWrites")
   public void testWriteModsInTxContext(boolean isOwner, WriteMethod method) throws Exception {
      Object KEY = getKey(isOwner, DIST);
      cache(0, DIST).put(KEY, "a");

      tm.begin();
      assertEquals("a", cache(0, DIST).put(KEY, "b"));
      // read-write operation should execute locally instead
      assertEquals("b", method.eval(KEY, null, rw,
            EntryView.ReadEntryView::get,
            (e, prev) -> e.set(prev + "c"), getClass()));
      // make sure that the operation was executed in context
      assertEquals("bc", ro.eval(KEY, MarshallableFunctions.returnReadOnlyFindOrNull()).join());
      tm.commit();
   }

   public static SerializableFunction<EntryView.ReadWriteEntryView<Object, String>, String> append(String str) {
      return ev -> {
         Optional<String> prev = ev.find();
         if (prev.isPresent()) {
            ev.set(prev.get() + str);
            return prev.get();
         } else {
            ev.set(str);
            return null;
         }
      };
   }

   @Test(dataProvider = "owningModeAndReadMethod")
   public void testReadOnMissingValues(boolean isOwner, ReadMethod method) throws Exception {
      testReadOnMissingValues(getKeys(isOwner, NUM_KEYS), ro, method);
   }

   @Test(dataProvider = "readMethods")
   public void testReadOnMissingValuesLocal(ReadMethod method) throws Exception {
      testReadOnMissingValues(INT_KEYS, lro, method);
   }

   private <K> void testReadOnMissingValues(K[] keys, FunctionalMap.ReadOnlyMap<K, String> ro, ReadMethod method) throws Exception {
      tm.begin();
      for (K key : keys) {
         Assert.assertEquals(ro.eval(key, view -> view.find().isPresent()).join(), Boolean.FALSE);
      }
      tm.commit();

      tm.begin();
      for (K key : keys) {
         expectExceptionNonStrict(CompletionException.class, CacheException.class, NoSuchElementException.class,
               () -> method.eval(key, ro, EntryView.ReadEntryView::get));
         // The first exception should cause the whole transaction to fail
         assertEquals(Status.STATUS_MARKED_ROLLBACK, tm.getStatus());
         tm.rollback();
         break;
      }
      if (tm.getStatus() == Status.STATUS_ACTIVE) {
         tm.commit();
      }
   }

   private Object[] getKeys(boolean isOwner, int num) {
      return IntStream.iterate(0, i -> i + 1)
            .mapToObj(i -> "key" + i)
            .filter(k -> cache(0, DIST).getAdvancedCache().getDistributionManager().getLocality(k).isLocal() == isOwner)
            .limit(num).toArray(Object[]::new);
   }
}
