/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 com.android.dumprendertree;

import android.app.Instrumentation;
import android.content.Intent;
import android.os.Bundle;
import android.test.ActivityInstrumentationTestCase2;
import android.util.Log;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Vector;

//TestRecorder creates two files, one for passing tests
//and another for failing tests and writes the paths to
//layout tests one line at a time. TestRecorder does not
//have ability to clear the results.
class MyTestRecorder {
    private BufferedOutputStream mBufferedOutputPassedStream;
    private BufferedOutputStream mBufferedOutputFailedStream;
    private BufferedOutputStream mBufferedOutputNoresultStream;
    
    public void passed(String layout_file) {
        try {
            mBufferedOutputPassedStream.write(layout_file.getBytes());
            mBufferedOutputPassedStream.write('\n');
            mBufferedOutputPassedStream.flush();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public void failed(String layout_file) {
        try {
            mBufferedOutputFailedStream.write(layout_file.getBytes());
            mBufferedOutputFailedStream.write('\n');
            mBufferedOutputFailedStream.flush();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public void noresult(String layout_file) {
        try {
            mBufferedOutputNoresultStream.write(layout_file.getBytes());
            mBufferedOutputNoresultStream.write('\n');
            mBufferedOutputNoresultStream.flush();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public MyTestRecorder(boolean resume) {
        try {
            File resultsPassedFile = new File("/sdcard/layout_tests_passed.txt");
            File resultsFailedFile = new File("/sdcard/layout_tests_failed.txt");
            File noExpectedResultFile = new File("/sdcard/layout_tests_nontext.txt");
          
            mBufferedOutputPassedStream =
                new BufferedOutputStream(new FileOutputStream(resultsPassedFile, resume));
            mBufferedOutputFailedStream =
                new BufferedOutputStream(new FileOutputStream(resultsFailedFile, resume));
            mBufferedOutputNoresultStream =
                new BufferedOutputStream(new FileOutputStream(noExpectedResultFile, resume));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public void close() {
        try {
            mBufferedOutputPassedStream.close();
            mBufferedOutputFailedStream.close();
            mBufferedOutputNoresultStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}


public class LayoutTestsAutoTest extends ActivityInstrumentationTestCase2<TestShellActivity> {

    private static final String LOGTAG = "LayoutTests";
    static final int DEFAULT_TIMEOUT_IN_MILLIS = 5000;
    
    static final String LAYOUT_TESTS_ROOT = "/sdcard/android/layout_tests/";
    static final String LAYOUT_TESTS_RESULT_DIR = "/sdcard/android/layout_tests_results/";
    static final String ANDROID_EXPECTED_RESULT_DIR = "/sdcard/android/expected_results/";
    static final String LAYOUT_TESTS_LIST_FILE = "/sdcard/android/layout_tests_list.txt";
    static final String TEST_STATUS_FILE = "/sdcard/android/running_test.txt";
    static final String LAYOUT_TESTS_RESULTS_REFERENCE_FILES[] = {
          "results/layout_tests_passed.txt",
          "results/layout_tests_failed.txt",
          "results/layout_tests_nontext.txt",
          "results/layout_tests_crashed.txt",
          "run_layout_tests.py"
    };

    static final String LAYOUT_RESULTS_FAILED_RESULT_FILE = "results/layout_tests_failed.txt";
    static final String LAYOUT_RESULTS_NONTEXT_RESULT_FILE = "results/layout_tests_nontext.txt";
    static final String LAYOUT_RESULTS_CRASHED_RESULT_FILE = "results/layout_tests_crashed.txt";
    static final String LAYOUT_TESTS_RUNNER = "run_layout_tests.py";

    private MyTestRecorder mResultRecorder;
    private Vector<String> mTestList;
    private boolean mRebaselineResults;
    private String mTestPathPrefix;
    private boolean mFinished;
    
    public LayoutTestsAutoTest() {
      super("com.android.dumprendertree", TestShellActivity.class);
    }

    // This function writes the result of the layout test to
    // Am status so that it can be picked up from a script.
    private void passOrFailCallback(String file, boolean result) {
      Instrumentation inst = getInstrumentation();
      Bundle bundle = new Bundle();
      bundle.putBoolean(file, result);
      inst.sendStatus(0, bundle);
    }
    
    private void getTestList() {
        // Read test list.
        try {
            BufferedReader inReader = new BufferedReader(new FileReader(LAYOUT_TESTS_LIST_FILE));
            String line = inReader.readLine();
            while (line != null) {
                if (line.startsWith(mTestPathPrefix))
                    mTestList.add(line);
                line = inReader.readLine();
            }
            inReader.close();
            Log.v(LOGTAG, "Test list has " + mTestList.size() + " test(s).");
        } catch (Exception e) {
            Log.e(LOGTAG, "Error while reading test list : " + e.getMessage());
        }
    }
  
    private void resumeTestList() {
        // read out the test name it stoped last time.
        try {
            BufferedReader inReader = new BufferedReader(new FileReader(TEST_STATUS_FILE));
            String line = inReader.readLine();
            for (int i = 0; i < mTestList.size(); i++) {
                if (mTestList.elementAt(i).equals(line)) {
                    mTestList = new Vector<String>(mTestList.subList(i+1, mTestList.size()));
                    break;
                }
            }
            inReader.close();
        } catch (Exception e) {
            Log.e(LOGTAG, "Error reading " + TEST_STATUS_FILE);
        }
    }
  
    private void clearTestStatus() {
        // Delete TEST_STATUS_FILE
        try {
            File f = new File(TEST_STATUS_FILE);
            if (f.delete())
                Log.v(LOGTAG, "Deleted " + TEST_STATUS_FILE);
            else
                Log.e(LOGTAG, "Fail to delete " + TEST_STATUS_FILE);
        } catch (Exception e) {
            Log.e(LOGTAG, "Fail to delete " + TEST_STATUS_FILE + " : " + e.getMessage());
        }
    }
  
    private void updateTestStatus(String s) {
        // Write TEST_STATUS_FILE
        try {
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(TEST_STATUS_FILE));
            bos.write(s.getBytes());
            bos.close();
        } catch (Exception e) {
            Log.e(LOGTAG, "Cannot update file " + TEST_STATUS_FILE);
        }
    }
    
    private String getResultFile(String test) {
        String shortName = test.substring(0, test.lastIndexOf('.'));
        // Write actual results to result directory.
        return shortName.replaceFirst(LAYOUT_TESTS_ROOT, LAYOUT_TESTS_RESULT_DIR) + "-result.txt";
    }
    
    private String getExpectedResultFile(String test) {
        String shortName = test.substring(0, test.lastIndexOf('.'));
        return shortName + "-expected.txt";          
    }

    private String getAndroidExpectedResultFile(String expectedResultFile) {
        return expectedResultFile.replaceFirst(LAYOUT_TESTS_ROOT, ANDROID_EXPECTED_RESULT_DIR);
    }

    // Wrap up
    private void failedCase(String file) {
        Log.w("Layout test: ", file + " failed");
        mResultRecorder.failed(file);    
    }

    private void passedCase(String file) {
        Log.v("Layout test:", file + " passed");
        mResultRecorder.passed(file);
    }

    private void noresultCase(String file) {
        Log.v("Layout test:", file + " no expected result");
        mResultRecorder.noresult(file);
    }
     
    private void processResult(String testFile, String actualResultFile, String expectedResultFile) {
        Log.v(LOGTAG, "  Processing result: " + testFile);

        File actual = new File(actualResultFile);
        File expected = new File(expectedResultFile);
        if (actual.exists() && expected.exists()) {
            try {
                boolean passing = true;
                BufferedReader fr = new BufferedReader(new FileReader(actual));
                BufferedReader fe = new BufferedReader(new FileReader(expected));
                while (true) {
                    String s1 = fr.readLine();
                    String s2 = fe.readLine();
                    if (s1 == null && s2 == null)
                        break; // both files are the same
                    if (s1 == null || s2 == null || !s1.equals(s2)) {
                        passing = false;
                        break;
                    }
                }
                
                if (passing) {
                    passedCase(testFile);
                } else {
                    failedCase(testFile);
                }
                
                fe.close();
                fr.close();
            } catch (FileNotFoundException ex) {
                Log.e(LOGTAG, "File not found : " + ex.getMessage());
            } catch (IOException ex) {
                Log.e(LOGTAG, "IO Error : " + ex.getMessage());
            }
            return;
        }

        if (!expected.exists()) {
            noresultCase(testFile);
        }
    }
    
    private void runTestAndWaitUntilDone(TestShellActivity activity, String test, int timeout) {
        activity.setCallback(new TestShellCallback() {
            public void finished() {
                synchronized (LayoutTestsAutoTest.this) {
                    mFinished = true;
                    LayoutTestsAutoTest.this.notifyAll();
                }
            }         
        });

        String resultFile = getResultFile(test);
        if (mRebaselineResults) {
            String expectedResultFile = getExpectedResultFile(test);
            File f = new File(expectedResultFile);
            if (f.exists()) {
                return;  // don't run test and don't overwrite default tests.
            }

            resultFile = getAndroidExpectedResultFile(expectedResultFile);
        }
        
        mFinished = false;
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setClass(activity, TestShellActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        intent.putExtra(TestShellActivity.TEST_URL, "file://" + test);
        intent.putExtra(TestShellActivity.RESULT_FILE, resultFile);
        intent.putExtra(TestShellActivity.TIMEOUT_IN_MILLIS, timeout);
        activity.startActivity(intent);
      
        // Wait until done.
        synchronized (this) {
            while(!mFinished){
                try {
                    this.wait();
                } catch (InterruptedException e) { }
            }
        }
        
        if (!mRebaselineResults) {
            String expectedResultFile = getExpectedResultFile(test);
            File f = new File(expectedResultFile);
            if (!f.exists()) {
                expectedResultFile = getAndroidExpectedResultFile(expectedResultFile);
            }
            
            processResult(test, resultFile, expectedResultFile);
        }
    } 
    
    // Invokes running of layout tests
    // and waits till it has finished running.
    public void executeLayoutTests(boolean resume) {
        LayoutTestsAutoRunner runner = (LayoutTestsAutoRunner) getInstrumentation();
        // A convenient method to be called by another activity.

        if (runner.mTestPath == null) {
            Log.e(LOGTAG, "No test specified");
            return;
        }

        this.mTestList = new Vector<String>();
      
        // Read settings
        try {
            this.mTestPathPrefix =
                (new File(LAYOUT_TESTS_ROOT + runner.mTestPath)).getCanonicalPath();
        } catch (IOException e) {  
            Log.e(LOGTAG, "Cannot find test path prefix: " + e.getMessage());
            return;
        }
        
        this.mRebaselineResults = runner.mRebaseline;
        
        int timeout = runner.mTimeoutInMillis;
        if (timeout <= 0) {
            timeout = DEFAULT_TIMEOUT_IN_MILLIS;
        }
          
        this.mResultRecorder = new MyTestRecorder(resume);
          
        if (!resume)
            clearTestStatus();
          
        getTestList();
        if (resume)
            resumeTestList();

        TestShellActivity activity = (TestShellActivity) getActivity();

        // Run tests.
        for (int i = 0; i < mTestList.size(); i++) {
            String s = mTestList.elementAt(i);
            updateTestStatus(s);
            // Run tests
            runTestAndWaitUntilDone(activity, s, runner.mTimeoutInMillis);
        }

        updateTestStatus("#DONE");
        
        activity.finish();
    }


    private String getTestPath() {
        LayoutTestsAutoRunner runner = (LayoutTestsAutoRunner) getInstrumentation();

        String test_path = LAYOUT_TESTS_ROOT;
        if (runner.mTestPath != null) {
            test_path += runner.mTestPath;
        }
        try {
            test_path = new File(test_path).getCanonicalPath();
        } catch (IOException e) {
            Log.e("LayoutTestsAutoTest", "Cannot get cannonical path " + e.getMessage());
        }
        Log.v("LayoutTestsAutoTest", " Test path : " + test_path);
        
        return test_path;
    }
    
    public void generateTestList() {
        try {
            File tests_list = new File(LAYOUT_TESTS_LIST_FILE);
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(tests_list, false));
            findTestsRecursively(bos, getTestPath());
            bos.flush();
            bos.close();
       } catch (Exception e) {
           Log.e(LOGTAG, "Error when creating test list: " + e.getMessage());
       }
    }

    private void findTestsRecursively(BufferedOutputStream bos, String dir) throws IOException {
         Log.v(LOGTAG, "Searching tests under " + dir);
         
         File d = new File(dir);
         if (!d.isDirectory()) {
             throw new AssertionError("A directory expected, but got " + dir);
         }
         
         String[] files = d.list();
         for (int i = 0; i < files.length; i++) {
             String s = dir + "/" + files[i];
             if (FileFilter.ignoreTest(s)) {
                 Log.v(LOGTAG, "  Ignoring: " + s);
                 continue;
             }
             if (s.toLowerCase().endsWith(".html") 
                 || s.toLowerCase().endsWith(".xml")) {
                 bos.write(s.getBytes());
                 bos.write('\n');
                 continue;
             }
             
             File f = new File(s);
             if (f.isDirectory()) {
                 findTestsRecursively(bos, s);
                 continue;
             }
             
             Log.v(LOGTAG, "Skipping " + s);
        }
    }
    
    // Running all the layout tests at once sometimes
    // causes the dumprendertree to run out of memory.
    // So, additional tests are added to run the tests
    // in chunks.
    public void startLayoutTests() {
        try {
            File tests_list = new File(LAYOUT_TESTS_LIST_FILE);
            if (!tests_list.exists())
              generateTestList();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        executeLayoutTests(false);
    }

    public void resumeLayoutTests() {
        executeLayoutTests(true);
    }

    public void copyResultsAndRunnerAssetsToCache() {
        try {
            String out_dir = getActivity().getApplicationContext().getCacheDir().getPath() + "/";

            for( int i=0; i< LAYOUT_TESTS_RESULTS_REFERENCE_FILES.length; i++) {
                InputStream in = getActivity().getAssets().open(LAYOUT_TESTS_RESULTS_REFERENCE_FILES[i]);
                OutputStream out = new FileOutputStream(out_dir + LAYOUT_TESTS_RESULTS_REFERENCE_FILES[i]);

                byte[] buf = new byte[2048];
                int len;

                while ((len = in.read(buf)) >= 0 ) {
                    out.write(buf, 0, len);
                }
                out.close();
                in.close();
            }
        }catch (IOException e) {
          e.printStackTrace();
        }

    }

}
