package org.ba.karlsruhe.filehandler;

import java.io.File;

public class FileHandlerTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			FileHandler handler = new FileHandler("testfile");

			String exampleText = "This is a test line";
			String exampleText2 = "Yet another line";
			handler.appendLine(exampleText);
			handler.appendLine(exampleText2);
			
			// verify written line (cache should still be valid)
			String[] fileContent = handler.getContent();
			if(fileContent.length != 2)
				System.out.println("Wrong number of lines returned");
			if(fileContent.length != handler.getLineCount())
				System.out.println("getLineCount() returned from line number count");
			if(!fileContent[0].equals(exampleText))
				System.out.println("Written line did not match read line");
			if(!handler.getContentAtLine(0).equals(exampleText))
				System.out.println("getContentAtLine() returned wrong line");

			// change file
			String blubTest = "this is some blub ;-)";
			handler.appendLine(blubTest);
			
			// ensure the line has been written
			handler.read();
			if(!handler.getContentAtLine(2).equals(blubTest))
				System.out.println("Line was not written out.");
			
			handler.removeLines("Blub", true); //nothing should happen
			handler.read(); // ensure a refreshed cache
			if(handler.getLineCount() != 3)
				System.out.println("removeLines() does not respect case-sensitivity");
			
			handler.removeLines("Blub", false);
			handler.read();
			if(handler.getLineCount() != 2)
				System.out.println("removeLines() does not respect insensitive case");
			
			fileContent = handler.getContent();
			if(!fileContent[0].equals(exampleText) || !fileContent[1].equals(exampleText2))
				System.out.println("huh, maybe the unit test has some false statements in it");
			
			
			File testFile = new File("testfile");
			testFile.delete();
			handler = null;
			
			/**
			 * Open another handler
			 */
			File file = new File("testfile2");
			handler = new FileHandler(file);
			
			// check write-behind mode
			handler.setWriteThrough(false);
			
			// do some benchmarking
			long startTime = System.currentTimeMillis();
			for(int i=0;i<500;i++)
				handler.appendLine("This is a test line");
			handler.write();
			long endTime = System.currentTimeMillis();
			long elapsedWriteBehind = endTime - startTime;
			
			System.out.println("Elapsed time in write-behind mode: " + elapsedWriteBehind + " ms");
			
			// check if the lines have been written out
			handler.read();
			if(handler.getLineCount() != 500)
				System.out.println("Wrong line count in write-behind mode");
			
			
			
			
			handler.setWriteThrough(true);
			handler.removeAllLines();
			if(handler.getLineCount() != 0)
				System.out.println("removeAllLines() does not work");
			
			// do some benchmarking with write-through
			startTime = System.currentTimeMillis();
			for(int i=0;i<500;i++)
				handler.appendLine("This is a test line");
			endTime = System.currentTimeMillis();
			long elapsedWriteThrough = endTime - startTime;
			
			System.out.println("Elapsed time in write-through mode: " + elapsedWriteThrough + " ms");
			
			
			if(elapsedWriteBehind > elapsedWriteThrough)
				System.out.println("Write-behind took longer than write-through, this should not happen");
			
			file.delete();
			
		} catch(FileHandlerException e) {
			System.out.println("An exception occured: " + e.getMessage());
		}
	}
}