package com.atlassian.webdriver.debug;
   
   import org.apache.commons.io.FileUtils;
   import org.apache.commons.io.IOUtils;
   import org.openqa.selenium.OutputType;
   import org.openqa.selenium.TakesScreenshot;
   import org.openqa.selenium.WebDriver;
   import org.openqa.selenium.WebDriverException;
   import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.annotation.Nonnull;
  import javax.inject.Inject;
  import java.io.File;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.Writer;
  
  import static com.atlassian.webdriver.utils.WebDriverUtil.as;
  import static com.atlassian.webdriver.utils.WebDriverUtil.isInstance;
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * An injectable component for performing common debug operations using {@link WebDriver}.
   *
   * @since 2.2
   */
  public final class WebDriverDebug
  {
      private static final Logger log = LoggerFactory.getLogger(WebDriverDebug.class);
  
      private final WebDriver webDriver;
  
      @Inject
      public WebDriverDebug(@Nonnull WebDriver webDriver)
      {
          this.webDriver = checkNotNull(webDriver, "webDriver");
      }
  
  
      /**
       * Get the URL that the underlying web driver is currently at.
       *
       * @return current URL
       */
      @Nonnull
      public String getCurrentUrl()
      {
          return webDriver.getCurrentUrl();
      }
  
      /**
       * <p/>
       * Writes the source of the last loaded page to the specified file. See {@link #dumpPageSourceTo(java.io.Writer)}
       * for details on how it works.
       *
       * <p/>
       * As opposed to {@link #dumpPageSourceTo(java.io.Writer)}, this method makes sure to close the handle used
       * to write to {@code dumpFile}.
       *
       * @param dumpFile File to write the source to.
       *
       */
      public boolean dumpSourceTo(@Nonnull File dumpFile)
      {
          checkNotNull(dumpFile, "dumpFile");
          FileWriter fileWriter = null;
          try
          {
              fileWriter = new FileWriter(dumpFile);
              IOUtils.write(webDriver.getPageSource(), fileWriter);
              return true;
          }
          catch (IOException e)
          {
              log.warn("Error dumping page source to " + dumpFile.getAbsolutePath() + ": " + e.getMessage());
              log.debug("Error dumping page source - details", e);
              return false;
          }
          finally
          {
              IOUtils.closeQuietly(fileWriter);
          }
      }
  
  
      /**
       * <p/>
       * Writes the source of the last loaded page to the specified writer. The writer is othewrwise not interacted with.
       * In particular, clients have to take care to close the {@code writer}.
       *
       * <p/>
       * This method will attempt to not propagate any exceptions that prevent it from completing. Instead, the write will
       * be aborted, the exception logged and {@literal false} returned. The only exception raised by this method is
       * {@link NullPointerException} in case {@code writer} is {@literal null}.
       *
       * @param writer writer to write the page source to
       */
      public boolean dumpPageSourceTo(@Nonnull Writer writer)
     {
         checkNotNull(writer, "writer");
         try
         {
             IOUtils.write(webDriver.getPageSource(), writer);
             return true;
         }
         catch (IOException e)
         {
             log.warn("Error dumping page source to " + writer + ": " + e.getMessage());
             log.debug("Error dumping page source - details", e);
             return false;
         }
     }
 
 
     /**
      * Saves screen shot of the browser to the specified file.
      * @param destFile File to save screen shot.
      */
     public boolean takeScreenshotTo(@Nonnull File destFile)
     {
         if (isInstance(webDriver, TakesScreenshot.class))
         {
             TakesScreenshot shotter = as(webDriver, TakesScreenshot.class);
             log.info("Saving screenshot to: " + destFile.getAbsolutePath());
             try
             {
                 File screenshot = shotter.getScreenshotAs(OutputType.FILE);
                 FileUtils.copyFile(screenshot, destFile);
                 return true;
             }
             catch (IOException e)
             {
                 logScreenshotError(destFile, e);
             }
             catch (WebDriverException e)
             {
                 logScreenshotError(destFile, e);
             }
         }
         else
         {
             log.warn("Driver {} is not capable of taking screenshots.", webDriver);
         }
         return false;
     }
 
     private void logScreenshotError(File destFile, Exception e)
     {
         log.warn("Could not capture screenshot to {}: {}", destFile, e.getMessage());
         log.debug("Capture screenshot - error details", e);
     }
 }