/*
 * Copyright 2016 OpenMarket Ltd
 * Copyright 2016 Vector Creations Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.matrix.olm;

import android.content.Context;
import android.text.TextUtils;
import android.util.Log;

import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.MethodSorters;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Map;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

@RunWith(AndroidJUnit4.class)
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class OlmAccountTest {
    private static final String LOG_TAG = "OlmAccountTest";
    private static final int GENERATION_ONE_TIME_KEYS_NUMBER = 50;

    private static OlmAccount mOlmAccount;
    private static OlmManager mOlmManager;
    private boolean mIsAccountCreated;
    private final String FILE_NAME = "SerialTestFile";

    @BeforeClass
    public static void setUpClass() {
        // load native lib
        mOlmManager = new OlmManager();

        String olmLibVersion = mOlmManager.getOlmLibVersion();
        assertNotNull(olmLibVersion);
        String olmSdkVersion = mOlmManager.getDetailedVersion(ApplicationProvider.getApplicationContext());
        assertNotNull(olmLibVersion);
        Log.d(LOG_TAG, "## setUpClass(): Versions - Android Olm SDK = " + olmSdkVersion + "  Olm lib =" + olmLibVersion);
    }

    @AfterClass
    public static void tearDownClass() {
        // TBD
    }

    @Before
    public void setUp() {
        if (mIsAccountCreated) {
            assertNotNull(mOlmAccount);
        }
    }

    @After
    public void tearDown() {
        // TBD
    }

    /**
     * Basic test: creation and release.
     */
    @Test
    public void test01CreateReleaseAccount() {
        try {
            mOlmAccount = new OlmAccount();
        } catch (OlmException e) {
            e.printStackTrace();
            fail("OlmAccount failed " + e.getMessage());
        }
        assertNotNull(mOlmAccount);

        mOlmAccount.releaseAccount();
        assertEquals(0, mOlmAccount.getOlmAccountId());
    }

    @Test
    public void test02CreateAccount() {
        try {
            mOlmAccount = new OlmAccount();
        } catch (OlmException e) {
            e.printStackTrace();
            fail("OlmAccount failed " + e.getMessage());
        }
        assertNotNull(mOlmAccount);
        mIsAccountCreated = true;
    }

    @Test
    public void test04GetOlmAccountId() {
        long olmNativeInstance = mOlmAccount.getOlmAccountId();
        Log.d(LOG_TAG, "## testGetOlmAccountId olmNativeInstance=" + olmNativeInstance);
        assertTrue(0 != olmNativeInstance);
    }

    /**
     * Test if {@link OlmAccount#identityKeys()} returns a JSON object
     * that contains the following keys: {@link OlmAccount#JSON_KEY_FINGER_PRINT_KEY}
     * and {@link OlmAccount#JSON_KEY_IDENTITY_KEY}
     */
    @Test
    public void test05IdentityKeys() {
        Map<String, String> identityKeys = null;
        try {
            identityKeys = mOlmAccount.identityKeys();
        } catch (Exception e) {
            fail("identityKeys failed " + e.getMessage());
        }
        assertNotNull(identityKeys);
        Log.d(LOG_TAG, "## testIdentityKeys Keys=" + identityKeys);

        // is JSON_KEY_FINGER_PRINT_KEY present?
        String fingerPrintKey = TestHelper.getFingerprintKey(identityKeys);
        assertFalse("fingerprint key missing", TextUtils.isEmpty(fingerPrintKey));

        // is JSON_KEY_IDENTITY_KEY present?
        String identityKey = TestHelper.getIdentityKey(identityKeys);
        assertFalse("identity key missing", TextUtils.isEmpty(identityKey));
    }

    //****************************************************
    //***************** ONE TIME KEYS TESTS **************
    //****************************************************
    @Test
    public void test06MaxOneTimeKeys() {
        long maxOneTimeKeys = mOlmAccount.maxOneTimeKeys();
        Log.d(LOG_TAG, "## testMaxOneTimeKeys(): maxOneTimeKeys=" + maxOneTimeKeys);

        assertTrue(maxOneTimeKeys > 0);
    }

    /**
     * Test one time keys generation.
     */
    @Test
    public void test07GenerateOneTimeKeys() {
        String error = null;

        try {
            mOlmAccount.generateOneTimeKeys(GENERATION_ONE_TIME_KEYS_NUMBER);
        } catch (Exception e) {
            error = e.getMessage();
        }

        assertNull(error);
    }

    /**
     * Test the generated amount of one time keys = GENERATION_ONE_TIME_KEYS_NUMBER.
     */
    @Test
    public void test08OneTimeKeysJsonFormat() {
        int oneTimeKeysCount = 0;
        Map<String, Map<String, String>> oneTimeKeysJson = null;

        try {
            oneTimeKeysJson = mOlmAccount.oneTimeKeys();
        } catch (Exception e) {
            fail(e.getMessage());
        }
        assertNotNull(oneTimeKeysJson);

        try {
            Map<String, String> map = oneTimeKeysJson.get(OlmAccount.JSON_KEY_ONE_TIME_KEY);
            assertNotNull(OlmAccount.JSON_KEY_ONE_TIME_KEY + " object is missing", map);

            // test the count of the generated one time keys:
            oneTimeKeysCount = map.size();

            assertEquals("Expected count=" + GENERATION_ONE_TIME_KEYS_NUMBER + " found=" + oneTimeKeysCount, GENERATION_ONE_TIME_KEYS_NUMBER, oneTimeKeysCount);

        } catch (Exception e) {
            fail("Exception MSg=" + e.getMessage());
        }
    }

    @Test
    public void test10RemoveOneTimeKeysForSession() {
        OlmSession olmSession = null;
        try {
            olmSession = new OlmSession();
        } catch (OlmException e) {
            fail("Exception Msg=" + e.getMessage());
        }
        long sessionId = olmSession.getOlmSessionId();
        assertTrue(0 != sessionId);

        String errorMessage = null;

        try {
            mOlmAccount.removeOneTimeKeys(olmSession);
        } catch (Exception e) {
            errorMessage = e.getMessage();
        }
        assertNotNull(errorMessage);

        olmSession.releaseSession();
        sessionId = olmSession.getOlmSessionId();
        assertEquals(0, sessionId);
    }

    @Test
    public void test11MarkOneTimeKeysAsPublished() {
        try {
            mOlmAccount.markOneTimeKeysAsPublished();
        } catch (Exception e) {
            fail(e.getMessage());
        }
    }

    @Test
    public void test12SignMessage() {
        String clearMsg = "String to be signed by olm";
        String signedMsg = null;

        try {
            signedMsg = mOlmAccount.signMessage(clearMsg);
        } catch (Exception e) {
            fail(e.getMessage());
        }

        assertNotNull(signedMsg);
        // additional tests are performed in test01VerifyEd25519Signing()
    }


    // ********************************************************
    // ************* SERIALIZATION TEST ***********************
    // ********************************************************

    @Test
    public void test13Serialization() {
        FileOutputStream fileOutput;
        ObjectOutputStream objectOutput;
        OlmAccount accountRef = null;
        OlmAccount accountDeserial;

        try {
            accountRef = new OlmAccount();
        } catch (OlmException e) {
            fail(e.getMessage());
        }

        try {
            accountRef.generateOneTimeKeys(GENERATION_ONE_TIME_KEYS_NUMBER);
        } catch (Exception e) {
            fail(e.getMessage());
        }

        // get keys references
        Map<String, String> identityKeysRef = null;

        try {
            identityKeysRef = accountRef.identityKeys();
        } catch (Exception e) {
            fail("identityKeys failed " + e.getMessage());
        }

        Map<String, Map<String, String>> oneTimeKeysRef = null;

        try {
            oneTimeKeysRef = accountRef.oneTimeKeys();
        } catch (Exception e) {
            fail(e.getMessage());
        }

        assertNotNull(identityKeysRef);
        assertNotNull(oneTimeKeysRef);

        try {
            Context context = ApplicationProvider.getApplicationContext();
            //context.getFilesDir();
            fileOutput = context.openFileOutput(FILE_NAME, Context.MODE_PRIVATE);

            // serialize account
            objectOutput = new ObjectOutputStream(fileOutput);
            objectOutput.writeObject(accountRef);
            objectOutput.flush();
            objectOutput.close();

            // deserialize account
            FileInputStream fileInput = context.openFileInput(FILE_NAME);
            ObjectInputStream objectInput = new ObjectInputStream(fileInput);
            accountDeserial = (OlmAccount) objectInput.readObject();
            objectInput.close();
            assertNotNull(accountDeserial);

            // get de-serialized keys
            Map<String, String> identityKeysDeserial = accountDeserial.identityKeys();
            Map<String, Map<String, String>> oneTimeKeysDeserial = accountDeserial.oneTimeKeys();
            assertNotNull(identityKeysDeserial);
            assertNotNull(oneTimeKeysDeserial);

            // compare identity keys
            assertEquals(identityKeysDeserial.toString(), identityKeysRef.toString());

            // compare onetime keys
            assertEquals(oneTimeKeysDeserial.toString(), oneTimeKeysRef.toString());

            accountRef.releaseAccount();
            accountDeserial.releaseAccount();
        } catch (FileNotFoundException e) {
            Log.e(LOG_TAG, "## test13Serialization(): Exception FileNotFoundException Msg==" + e.getMessage());
            fail("test13Serialization failed " + e.getMessage());
        } catch (ClassNotFoundException e) {
            Log.e(LOG_TAG, "## test13Serialization(): Exception ClassNotFoundException Msg==" + e.getMessage());
            fail("test13Serialization failed " + e.getMessage());
        } catch (IOException e) {
            Log.e(LOG_TAG, "## test13Serialization(): Exception IOException Msg==" + e.getMessage());
            fail("test13Serialization failed " + e.getMessage());
        }
        /*catch (OlmException e) {
            Log.e(LOG_TAG, "## test13Serialization(): Exception OlmException Msg==" + e.getMessage());
        }*/ catch (Exception e) {
            Log.e(LOG_TAG, "## test13Serialization(): Exception Msg==" + e.getMessage());
            fail("test13Serialization failed " + e.getMessage());
        }
    }


    // ****************************************************
    // *************** SANITY CHECK TESTS *****************
    // ****************************************************

    @Test
    public void test14GenerateOneTimeKeysError() {
        // keys number = 0 => no error

        String errorMessage = null;
        try {
            mOlmAccount.generateOneTimeKeys(0);
        } catch (Exception e) {
            errorMessage = e.getMessage();
        }

        assertNull(errorMessage);

        // keys number = negative value
        errorMessage = null;
        try {
            mOlmAccount.generateOneTimeKeys(-50);
        } catch (Exception e) {
            errorMessage = e.getMessage();
        }

        assertNotNull(errorMessage);
    }

    @Test
    public void test15RemoveOneTimeKeysForSessionError() {
        OlmAccount olmAccount = null;
        try {
            olmAccount = new OlmAccount();
        } catch (OlmException e) {
            fail(e.getMessage());
        }

        try {
            olmAccount.removeOneTimeKeys(null);
        } catch (Exception e) {
            fail(e.getMessage());
        }

        olmAccount.releaseAccount();
    }

    @Test
    public void test16SignMessageError() {
        OlmAccount olmAccount = null;
        try {
            olmAccount = new OlmAccount();
        } catch (OlmException e) {
            fail(e.getMessage());
        }
        String signedMsg = null;

        try {
            signedMsg = olmAccount.signMessage(null);
        } catch (Exception e) {
        }

        assertNull(signedMsg);

        olmAccount.releaseAccount();
    }

    /**
     * Create multiple accounts and check that identity keys are still different.
     * This test validates random series are provide enough random values.
     */
    @Test
    public void test17MultipleAccountCreation() {
        try {
            OlmAccount account1 = new OlmAccount();
            OlmAccount account2 = new OlmAccount();
            OlmAccount account3 = new OlmAccount();
            OlmAccount account4 = new OlmAccount();
            OlmAccount account5 = new OlmAccount();
            OlmAccount account6 = new OlmAccount();
            OlmAccount account7 = new OlmAccount();
            OlmAccount account8 = new OlmAccount();
            OlmAccount account9 = new OlmAccount();
            OlmAccount account10 = new OlmAccount();

            Map<String, String> identityKeys1 = account1.identityKeys();
            Map<String, String> identityKeys2 = account2.identityKeys();
            Map<String, String> identityKeys3 = account3.identityKeys();
            Map<String, String> identityKeys4 = account4.identityKeys();
            Map<String, String> identityKeys5 = account5.identityKeys();
            Map<String, String> identityKeys6 = account6.identityKeys();
            Map<String, String> identityKeys7 = account7.identityKeys();
            Map<String, String> identityKeys8 = account8.identityKeys();
            Map<String, String> identityKeys9 = account9.identityKeys();
            Map<String, String> identityKeys10 = account10.identityKeys();

            String identityKey1 = TestHelper.getIdentityKey(identityKeys1);
            String identityKey2 = TestHelper.getIdentityKey(identityKeys2);
            assertNotEquals(identityKey1, identityKey2);

            String identityKey3 = TestHelper.getIdentityKey(identityKeys3);
            assertNotEquals(identityKey2, identityKey3);

            String identityKey4 = TestHelper.getIdentityKey(identityKeys4);
            assertNotEquals(identityKey3, identityKey4);

            String identityKey5 = TestHelper.getIdentityKey(identityKeys5);
            assertNotEquals(identityKey4, identityKey5);

            String identityKey6 = TestHelper.getIdentityKey(identityKeys6);
            assertNotEquals(identityKey5, identityKey6);

            String identityKey7 = TestHelper.getIdentityKey(identityKeys7);
            assertNotEquals(identityKey6, identityKey7);

            String identityKey8 = TestHelper.getIdentityKey(identityKeys8);
            assertNotEquals(identityKey7, identityKey8);

            String identityKey9 = TestHelper.getIdentityKey(identityKeys9);
            assertNotEquals(identityKey8, identityKey9);

            String identityKey10 = TestHelper.getIdentityKey(identityKeys10);
            assertNotEquals(identityKey9, identityKey10);

            account1.releaseAccount();
            account2.releaseAccount();
            account3.releaseAccount();
            account4.releaseAccount();
            account5.releaseAccount();
            account6.releaseAccount();
            account7.releaseAccount();
            account8.releaseAccount();
            account9.releaseAccount();
            account10.releaseAccount();

        } catch (OlmException e) {
            fail(e.getMessage());
        }
    }
}
