/*
 * AppleCommander - An Apple ][ image utility.
 * Copyright (C) 2002 by Robert Greene
 * robgreene at users.sourceforge.net
 *
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by the 
 * Free Software Foundation; either version 2 of the License, or (at your 
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package com.webcodepro.applecommander.storage;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * Abstract representation of a formatted Apple2 disk (floppy, 800k, hard disk).
 * <p>
 * Date created: Oct 5, 2002 3:51:44 PM
 * @author: Rob Greene
 */
public abstract class FormattedDisk extends Disk {
	/**
	 * Use this inner class for label/value mappings in the disk info page.
	 */
	public class DiskInformation {
		private String label;
		private String value;
		public DiskInformation(String label, String value) {
			this.label = label;
			this.value = value;
		}
		public DiskInformation(String label, int value) {
			this.label = label;
			this.value = Integer.toString(value);
		}
		public DiskInformation(String label, Date value) {
			SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
			this.label = label;
			if (value != null) {
				this.value = dateFormat.format(value);
			} else {
				this.value = "-None-";
			}
		}
		public String getLabel() {
			return this.label;
		}
		public String getValue() {
			return this.value;
		}
	}
	
	/**
	 * Use this inner interface for managing the disk usage data.
	 * This offloads format-specific implementation to the implementing class.
	 * The usage is very similar to a Java2 Iterator - next must be called to
	 * set the value and isFree/isUsed are available for that location.
	 */
	public interface DiskUsage {
		public boolean hasNext();
		public void next();
		public boolean isFree();
		public boolean isUsed();
	}
	
	/**
	 * This inner class represents the column header information used
	 * in the directory display.  Note that this needs to be synchronized
	 * with the appropriate FileEntry objects.
	 */
	public static final int FILE_DISPLAY_STANDARD = 1;
	public static final int FILE_DISPLAY_NATIVE = 2;
	public static final int FILE_DISPLAY_DETAIL = 3;
	public class FileColumnHeader {
		public static final int ALIGN_LEFT = 1;
		public static final int ALIGN_CENTER = 2;
		public static final int ALIGN_RIGHT = 3;
		private String title;
		private int maximumWidth;
		private int alignment;
		public FileColumnHeader(String title, int maximumWidth, int alignment) {
			this.title = title;
			this.maximumWidth = maximumWidth;
			this.alignment = alignment;
		}
		public String getTitle() {
			return title;
		}
		public int getMaximumWidth() {
			return maximumWidth;
		}
		public int getAlignment() {
			return alignment;
		}
		public boolean isLeftAlign() {
			return alignment == ALIGN_LEFT;
		}
		public boolean isCenterAlign() {
			return alignment == ALIGN_CENTER;
		}
		public boolean isRightAlign() {
			return alignment == ALIGN_RIGHT;
		}
	}
	
	/**
	 * Constructor for FormattedDisk.
	 * @param filename
	 * @param diskImage
	 */
	public FormattedDisk(String filename, byte[] diskImage) {
		super(filename, diskImage);
	}

	/**
	 * Identify if this disk format is capable of having directories.
	 */
	public abstract boolean canHaveDirectories();

	/**
	 * Return the name of the disk.  Not the physical file name,
	 * but "DISK VOLUME #xxx" (DOS 3.3) or "/MY.DISK" (ProDOS).
	 */
	public abstract String getDiskName();

	/**
	 * Retrieve a list of files.
	 */
	public abstract List getFiles();

	/**
	 * Identify the operating system format of this disk.
	 */
	public abstract String getFormat();

	/**
	 * Return the amount of free space in bytes.
	 */
	public abstract int getFreeSpace();

	/**
	 * Return the amount of used space in bytes.
	 */
	public abstract int getUsedSpace();

	/**
	 * Get suggested dimensions for display of bitmap.
	 * Typically, this will be only used for 5.25" floppies.
	 * This can return null if there is no suggestion.
	 */
	public abstract int[] getBitmapDimensions();
	
	/**
	 * Get the length of the bitmap.
	 */
	public abstract int getBitmapLength();
	
	/**
	 * Get the disk usage iterator.
	 */
	public abstract DiskUsage getDiskUsage();
	
	/**
	 * Get the labels to use in the bitmap.
	 * Note that this should, at a minimum, return an array of
	 * String[1] unless the bitmap has not been implemented.
	 */
	public abstract String[] getBitmapLabels();
	
	/**
	 * Get disk information.  This is intended to be pretty generic -
	 * each disk format can build this as appropriate.  Each subclass should
	 * override this method and add its own detail.
	 */
	public List getDiskInformation() {
		List list = new ArrayList();
		list.add(new DiskInformation("File Name", getFilename()));
		list.add(new DiskInformation("Disk Name", getDiskName()));
		list.add(new DiskInformation("Physical Size (bytes)", getPhysicalSize()));
		list.add(new DiskInformation("Free Space (bytes)", getFreeSpace()));
		list.add(new DiskInformation("Used Space (bytes)", getUsedSpace()));
		list.add(new DiskInformation("Physical Size (KB)", getPhysicalSize() / 1024));
		list.add(new DiskInformation("Free Space (KB)", getFreeSpace() / 1024));
		list.add(new DiskInformation("Used Space (KB)", getUsedSpace() / 1024));
		list.add(new DiskInformation("Archive Order", 
					is2ImgOrder() ? "2IMG" :
					isDosOrder() ? "DOS 3.3" : 
					isProdosOrder() ? "ProDOS" : "Unknown"));
		list.add(new DiskInformation("Disk Format", getFormat()));
		return list;
	}
	
	/**
	 * Get the standard file column header information.
	 * This default implementation is intended only for standard mode.
	 */
	public List getFileColumnHeaders(int displayMode) {
		List list = new ArrayList();
		list.add(new FileColumnHeader("Name", 30, FileColumnHeader.ALIGN_LEFT));
		list.add(new FileColumnHeader("Type", 8, FileColumnHeader.ALIGN_CENTER));
		list.add(new FileColumnHeader("Size (bytes)", 6, FileColumnHeader.ALIGN_RIGHT));
		list.add(new FileColumnHeader("Locked?", 6, FileColumnHeader.ALIGN_CENTER));
		return list;
	}
	
	/**
	 * Indicates if this disk format supports "deleted" files.
	 * Not to be confused with being able to delete a file, this indicates that
	 * deleted entries remain in the filesystem after the file has been deleted.
	 * There are some filesystems that "compress" the file out of the structure
	 * by completely removing the entry instead of marking it deleted (like 
	 * Apple Pascal).
	 */
	public abstract boolean supportsDeletedFiles();
	
	/**
	 * Indicates if this disk image can read data from a file.
	 * If not, the reason may be as simple as it has not beem implemented
	 * to something specific about the disk.
	 */
	public abstract boolean canReadFileData();
	
	/**
	 * Indicates if this disk image can write data to a file.
	 * If not, the reason may be as simple as it has not beem implemented
	 * to something specific about the disk (such as read-only image).
	 */
	public abstract boolean canWriteFileData();
	
	/**
	 * Indicates if this disk image can create a file.
	 * If not, the reason may be as simple as it has not beem implemented
	 * to something specific about the disk.
	 */
	public abstract boolean canCreateFile();
	
	/**
	 * Indicates if this disk image can delete a file.
	 * If not, the reason may be as simple as it has not beem implemented
	 * to something specific about the disk.
	 */
	public abstract boolean canDeleteFile();
	
	/**
	 * Get the data associated with the specified FileEntry.
	 * This is just the raw data.  Use the FileEntry itself to read
	 * data appropriately!  For instance, DOS "B" (binary) files store
	 * length and address as part of the file itself, but it is not treated
	 * as file data.
	 * @see FileEntry#getFileData()
	 */
	public abstract byte[] getFileData(FileEntry fileEntry);
	
	/**
	 * Locate a specific file by filename.
	 * Returns a null if specific filename is not located.
	 */
	public FileEntry getFile(String filename) {
		List files = getFiles();
		return getFile(files, filename.trim());
	}
	
	/**
	 * Recursive routine to locate a specific file by filename.
	 * Note that in the instance of a system with directories (ie, ProDOS),
	 * this really returns the first file with the given filename.
	 */
	protected FileEntry getFile(List files, String filename) {
		FileEntry theFileEntry = null;
		if (files != null) {
			for (int i=0; i<files.size(); i++) {
				FileEntry entry = (FileEntry) files.get(i);
				if (entry.isDirectory()) {
					theFileEntry = getFile(entry.getFiles(), filename);
					break;
				}
				String otherFilename = entry.getFilename();
				if (otherFilename != null) otherFilename = otherFilename.trim();
				if (filename.equalsIgnoreCase(otherFilename)) {
					theFileEntry = entry;
					break;
				}
			}
		}
		return theFileEntry;
	}
}