/*
 * Copyright (c) 2002-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

/*
uint32   flags
uint64   size           present only if flag SSH_FILEXFER_ATTR_SIZE
uint32   uid            present only if flag SSH_FILEXFER_ATTR_UIDGID
uint32   gid            present only if flag SSH_FILEXFER_ATTR_UIDGID
uint32   permissions    present only if flag SSH_FILEXFER_ATTR_PERMISSIONS
uint32   atime          present only if flag SSH_FILEXFER_ACMODTIME
uint32   mtime          present only if flag SSH_FILEXFER_ACMODTIME
uint32   extended_count present only if flag SSH_FILEXFER_ATTR_EXTENDED
string   extended_type
string   extended_data
...      more extended data (extended_type - extended_data pairs),
         so that number of pairs equals extended_count
*/
public class SftpATTRS {

  static final int S_ISUID = 04000; // set user ID on execution
  static final int S_ISGID = 02000; // set group ID on execution
  static final int S_ISVTX = 01000; // sticky bit ****** NOT DOCUMENTED *****

  static final int S_IRUSR = 00400; // read by owner
  static final int S_IWUSR = 00200; // write by owner
  static final int S_IXUSR = 00100; // execute/search by owner
  static final int S_IREAD = 00400; // read by owner
  static final int S_IWRITE = 00200; // write by owner
  static final int S_IEXEC = 00100; // execute/search by owner

  static final int S_IRGRP = 00040; // read by group
  static final int S_IWGRP = 00020; // write by group
  static final int S_IXGRP = 00010; // execute/search by group

  static final int S_IROTH = 00004; // read by others
  static final int S_IWOTH = 00002; // write by others
  static final int S_IXOTH = 00001; // execute/search by others

  private static final int pmask = 0xFFF;

  public String getPermissionsString() {
    StringBuilder buf = new StringBuilder(10);

    if (isDir())
      buf.append('d');
    else if (isLink())
      buf.append('l');
    else
      buf.append('-');

    if ((permissions & S_IRUSR) != 0)
      buf.append('r');
    else
      buf.append('-');

    if ((permissions & S_IWUSR) != 0)
      buf.append('w');
    else
      buf.append('-');

    if ((permissions & S_ISUID) != 0)
      buf.append('s');
    else if ((permissions & S_IXUSR) != 0)
      buf.append('x');
    else
      buf.append('-');

    if ((permissions & S_IRGRP) != 0)
      buf.append('r');
    else
      buf.append('-');

    if ((permissions & S_IWGRP) != 0)
      buf.append('w');
    else
      buf.append('-');

    if ((permissions & S_ISGID) != 0)
      buf.append('s');
    else if ((permissions & S_IXGRP) != 0)
      buf.append('x');
    else
      buf.append('-');

    if ((permissions & S_IROTH) != 0)
      buf.append('r');
    else
      buf.append('-');

    if ((permissions & S_IWOTH) != 0)
      buf.append('w');
    else
      buf.append('-');

    if ((permissions & S_IXOTH) != 0)
      buf.append('x');
    else
      buf.append('-');
    return (buf.toString());
  }

  public String getAtimeString() {
    return toDateString(Integer.toUnsignedLong(atime));
  }

  public String getMtimeString() {
    return toDateString(Integer.toUnsignedLong(mtime));
  }

  private static DateTimeFormatter DTF =
      DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz yyyy", Locale.ROOT);

  static String toDateString(long epochSeconds) {
    Instant instant = Instant.ofEpochSecond(epochSeconds);
    ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
    return DTF.format(zdt);
  }

  public static final int SSH_FILEXFER_ATTR_SIZE = 0x00000001;
  public static final int SSH_FILEXFER_ATTR_UIDGID = 0x00000002;
  public static final int SSH_FILEXFER_ATTR_PERMISSIONS = 0x00000004;
  public static final int SSH_FILEXFER_ATTR_ACMODTIME = 0x00000008;
  public static final int SSH_FILEXFER_ATTR_EXTENDED = 0x80000000;

  static final int S_IFMT = 0xf000;
  static final int S_IFIFO = 0x1000;
  static final int S_IFCHR = 0x2000;
  static final int S_IFDIR = 0x4000;
  static final int S_IFBLK = 0x6000;
  static final int S_IFREG = 0x8000;
  static final int S_IFLNK = 0xa000;
  static final int S_IFSOCK = 0xc000;

  int flags = 0;
  long size;
  int uid;
  int gid;
  int permissions;
  int atime;
  int mtime;
  String[] extended = null;

  private SftpATTRS() {}

  static SftpATTRS getATTR(Buffer buf) {
    SftpATTRS attr = new SftpATTRS();
    attr.flags = buf.getInt();
    if ((attr.flags & SSH_FILEXFER_ATTR_SIZE) != 0) {
      attr.size = buf.getLong();
    }
    if ((attr.flags & SSH_FILEXFER_ATTR_UIDGID) != 0) {
      attr.uid = buf.getInt();
      attr.gid = buf.getInt();
    }
    if ((attr.flags & SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
      attr.permissions = buf.getInt();
    }
    if ((attr.flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
      attr.atime = buf.getInt();
    }
    if ((attr.flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
      attr.mtime = buf.getInt();
    }
    if ((attr.flags & SSH_FILEXFER_ATTR_EXTENDED) != 0) {
      int count = buf.getInt();
      if (count > 0) {
        attr.extended = new String[count * 2];
        for (int i = 0; i < count; i++) {
          attr.extended[i * 2] = Util.byte2str(buf.getString());
          attr.extended[i * 2 + 1] = Util.byte2str(buf.getString());
        }
      }
    }
    return attr;
  }

  int length() {
    int len = 4;

    if ((flags & SSH_FILEXFER_ATTR_SIZE) != 0) {
      len += 8;
    }
    if ((flags & SSH_FILEXFER_ATTR_UIDGID) != 0) {
      len += 8;
    }
    if ((flags & SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
      len += 4;
    }
    if ((flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
      len += 8;
    }
    if ((flags & SSH_FILEXFER_ATTR_EXTENDED) != 0) {
      len += 4;
      int count = extended.length / 2;
      if (count > 0) {
        for (int i = 0; i < count; i++) {
          len += 4;
          len += extended[i * 2].length();
          len += 4;
          len += extended[i * 2 + 1].length();
        }
      }
    }
    return len;
  }

  void dump(Buffer buf) {
    buf.putInt(flags);
    if ((flags & SSH_FILEXFER_ATTR_SIZE) != 0) {
      buf.putLong(size);
    }
    if ((flags & SSH_FILEXFER_ATTR_UIDGID) != 0) {
      buf.putInt(uid);
      buf.putInt(gid);
    }
    if ((flags & SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
      buf.putInt(permissions);
    }
    if ((flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
      buf.putInt(atime);
    }
    if ((flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
      buf.putInt(mtime);
    }
    if ((flags & SSH_FILEXFER_ATTR_EXTENDED) != 0) {
      int count = extended.length / 2;
      if (count > 0) {
        for (int i = 0; i < count; i++) {
          buf.putString(Util.str2byte(extended[i * 2]));
          buf.putString(Util.str2byte(extended[i * 2 + 1]));
        }
      }
    }
  }

  void setFLAGS(int flags) {
    this.flags = flags;
  }

  public void setSIZE(long size) {
    flags |= SSH_FILEXFER_ATTR_SIZE;
    this.size = size;
  }

  public void setUIDGID(int uid, int gid) {
    flags |= SSH_FILEXFER_ATTR_UIDGID;
    this.uid = uid;
    this.gid = gid;
  }

  public void setACMODTIME(int atime, int mtime) {
    flags |= SSH_FILEXFER_ATTR_ACMODTIME;
    this.atime = atime;
    this.mtime = mtime;
  }

  public void setPERMISSIONS(int permissions) {
    flags |= SSH_FILEXFER_ATTR_PERMISSIONS;
    permissions = (this.permissions & ~pmask) | (permissions & pmask);
    this.permissions = permissions;
  }

  private boolean isType(int mask) {
    return (flags & SSH_FILEXFER_ATTR_PERMISSIONS) != 0 && (permissions & S_IFMT) == mask;
  }

  public boolean isReg() {
    return isType(S_IFREG);
  }

  public boolean isDir() {
    return isType(S_IFDIR);
  }

  public boolean isChr() {
    return isType(S_IFCHR);
  }

  public boolean isBlk() {
    return isType(S_IFBLK);
  }

  public boolean isFifo() {
    return isType(S_IFIFO);
  }

  public boolean isLink() {
    return isType(S_IFLNK);
  }

  public boolean isSock() {
    return isType(S_IFSOCK);
  }

  public int getFlags() {
    return flags;
  }

  public long getSize() {
    return size;
  }

  public int getUId() {
    return uid;
  }

  public int getGId() {
    return gid;
  }

  public int getPermissions() {
    return permissions;
  }

  public int getATime() {
    return atime;
  }

  public int getMTime() {
    return mtime;
  }

  public String[] getExtended() {
    return extended;
  }

  @Override
  public String toString() {
    return (getPermissionsString() + " " + getUId() + " " + getGId() + " " + getSize() + " "
        + getMtimeString());
  }
  /*
  public String toString() {
    return (((flags & SSH_FILEXFER_ATTR_SIZE) != 0) ? ("size:" + size + " ") : "") +
           (((flags & SSH_FILEXFER_ATTR_UIDGID) != 0) ? ("uid:" + uid + ",gid:" + gid + " ") : "") +
           (((flags & SSH_FILEXFER_ATTR_PERMISSIONS) != 0) ? ("permissions:0x" + Integer.toHexString(permissions) + " ") : "") +
           (((flags & SSH_FILEXFER_ATTR_ACMODTIME) != 0) ? ("atime:" + atime + ",mtime:" + mtime + " ") : "") +
           (((flags & SSH_FILEXFER_ATTR_EXTENDED) != 0) ? ("extended:?" + " ") : "");
  }
  */
}
