package com.bytezone.diskbrowser.prodos.write;

import static com.bytezone.diskbrowser.prodos.write.ProdosDisk.ENTRY_SIZE;
import static com.bytezone.diskbrowser.utilities.Utility.getAppleDate;
import static com.bytezone.diskbrowser.utilities.Utility.putAppleDate;
import static com.bytezone.diskbrowser.utilities.Utility.readShort;
import static com.bytezone.diskbrowser.utilities.Utility.writeShort;

import java.time.LocalDateTime;

// -----------------------------------------------------------------------------------//
public class DirectoryHeader
// -----------------------------------------------------------------------------------//
{
  static final int BLOCK_SIZE = 512;

  ProdosDisk disk;
  byte[] buffer;
  int ptr;

  String fileName;
  byte storageType;
  LocalDateTime creationDate;
  byte version = 0x00;
  byte minVersion = 0x00;
  byte access = (byte) 0xE3;
  byte entryLength = ENTRY_SIZE;
  byte entriesPerBlock = 0x0D;
  int fileCount;

  // ---------------------------------------------------------------------------------//
  public DirectoryHeader (ProdosDisk disk, byte[] buffer, int ptr)
  // ---------------------------------------------------------------------------------//
  {
    this.disk = disk;
    this.buffer = buffer;
    this.ptr = ptr;
  }

  // ---------------------------------------------------------------------------------//
  void read ()
  // ---------------------------------------------------------------------------------//
  {
    storageType = (byte) ((buffer[ptr] & 0xF0) >>> 4);
    int nameLength = buffer[ptr] & 0x0F;
    fileName = new String (buffer, ptr + 1, nameLength);
    creationDate = getAppleDate (buffer, ptr + 0x18);
    version = buffer[ptr + 0x1C];
    minVersion = buffer[ptr + 0x1D];
    access = buffer[ptr + 0x1E];
    entryLength = buffer[ptr + 0x1F];
    entriesPerBlock = buffer[ptr + 0x20];
    fileCount = readShort (buffer, ptr + 0x21);
  }

  // ---------------------------------------------------------------------------------//
  void write ()
  // ---------------------------------------------------------------------------------//
  {
    buffer[ptr] = (byte) ((storageType << 4) | fileName.length ());
    System.arraycopy (fileName.getBytes (), 0, buffer, ptr + 1, fileName.length ());

    putAppleDate (buffer, ptr + 0x18, creationDate);
    buffer[ptr + 0x1C] = version;
    buffer[ptr + 0x1D] = minVersion;
    buffer[ptr + 0x1E] = access;
    buffer[ptr + 0x1F] = entryLength;
    buffer[ptr + 0x20] = entriesPerBlock;
    writeShort (buffer, ptr + 0x21, fileCount);
  }

  // ---------------------------------------------------------------------------------//
  @Override
  public String toString ()
  // ---------------------------------------------------------------------------------//
  {
    StringBuilder text = new StringBuilder ();

    int blockNo = ptr / BLOCK_SIZE;
    text.append (String.format ("Block ............ %04X%n", blockNo));
    text.append (String.format ("Entry ............ %02X%n",
        (ptr - blockNo * BLOCK_SIZE - 4) / 39));

    text.append (String.format ("Storage type ..... %02X  %s%n", storageType,
        ProdosDisk.storageTypes[storageType]));
    text.append (String.format ("Name length ...... %02X%n", fileName.length ()));
    text.append (String.format ("File name ........ %s%n", fileName));
    text.append (String.format ("Version .......... %02X%n", version));
    text.append (String.format ("Min version ...... %02X%n", minVersion));
    text.append (String.format ("Created .......... %s%n", creationDate));
    text.append (String.format ("Access ........... %02X%n", access));
    text.append (String.format ("Entry length ..... %02X%n", entryLength));
    text.append (String.format ("Entries per blk .. %02X%n", entriesPerBlock));
    text.append (String.format ("File count ....... %d%n", fileCount));

    return text.toString ();
  }
}