/*
  Copyright (C) 2004 SKYRIX Software AG

  This file is part of OpenGroupware.org.

  OGo is free software; you can redistribute it and/or modify it under
  the terms of the GNU Lesser General Public License as published by the
  Free Software Foundation; either version 2, or (at your option) any
  later version.

  OGo 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 Lesser General Public
  License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with OGo; see the file COPYING.  If not, write to the
  Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#import "common.h"

#import <SoObjects/Mailer/SOGoMailBaseObject.h>
#import <SoObjects/Mailer/SOGoMailAccount.h>
#import <SoObjects/Mailer/SOGoMailFolder.h>
#import <NGObjWeb/SoComponent.h>
#import <NGObjWeb/SoObject+SoDAV.h>

#import "UIxMailTree.h"
#import "UIxMailTreeBlock.h"

/*
  Support special icons:
    tbtv_leaf_corner_17x17.gif
    tbtv_inbox_17x17.gif
    tbtv_drafts_17x17.gif
    tbtv_sent_17x17.gif
    tbtv_trash_17x17.gif
*/

@interface NSString(DotCutting)

- (NSString *)stringByCuttingOffAtDotsWhenExceedingLength:(int)_maxLength;

- (NSString *)titleForSOGoIMAP4String;

@end

@implementation UIxMailTree

static BOOL debugBlocks = NO;

+ (void)initialize
{
  [UIxMailTreeBlock class]; // ensure that globals are initialized
}

- (id) init
{
  if ((self = [super init]))
    {
      flattenedNodes = [NSMutableDictionary new];
    }
  return self;
}

- (void) dealloc
{
  [self->treeFolderAction release];
  [self->rootClassName    release];
  [self->rootNodes release];
  [self->item      release];
  [flattenedNodes release];
  [super dealloc];
}

/* icons */

- (NSString *) defaultIconName
{
  return @"tbtv_leaf_corner_17x17.gif";
}

- (NSString *)iconNameForType:(NSString *)_type {
  if (![_type isNotNull])
    return [self defaultIconName];
  
  //return @"tbtv_drafts_17x17.gif";
  
  return [self defaultIconName];
}

/* accessors */

- (void)setRootClassName:(id)_rootClassName {
  ASSIGNCOPY(self->rootClassName, _rootClassName);
}
- (id)rootClassName {
  return self->rootClassName;
}

- (void)setItem:(id)_item {
  ASSIGN(self->item, _item);
}
- (id)item {
  return self->item;
}

- (void)setTreeFolderAction:(NSString *)_action {
  ASSIGNCOPY(self->treeFolderAction, _action);
}
- (NSString *)treeFolderAction {
  return self->treeFolderAction;
}

- (NSString *)itemIconName {
  // TODO: only called once!
  NSString *ftype;
  
  ftype = [[self item] valueForKey:@"outlookFolderClass"];
  return [self iconNameForType:ftype];
}

/* fetching subfolders */

- (NSArray *)fetchSubfoldersOfObject:(id)_object {
  /* Walk over toManyRelationshipKeys and lookup the controllers for them. */
  NSMutableArray *ma;
  NSArray  *names;
  unsigned i, count;
  
  if ((names = [_object toManyRelationshipKeys]) == nil) {
    if (debugBlocks) [self logWithFormat:@"no to-many: %@", _object];
    return nil;
  }
  
  if (debugBlocks) {
    [self logWithFormat:@"to-many: %@ %@", _object,
	  [names componentsJoinedByString:@","]];
  }

  count = [names count];
  ma    = [NSMutableArray arrayWithCapacity:(count + 1)];
  for (i = 0; i < count; i++) {
    id folder;
    
    // TODO: use some context or reuse the main context?
    folder = [_object lookupName:[names objectAtIndex:i] inContext:nil 
		      acquire:NO];
    if (folder == nil) {
      if (debugBlocks) {
	[self logWithFormat:@"  DID NOT FIND FOLDER %@: %@",
	        _object,
	        [names objectAtIndex:i]];
      }
      continue;
    }
    if ([folder isKindOfClass:[NSException class]]) {
      if (debugBlocks) {
	[self logWithFormat:@"  FOLDER LOOKUP EXCEPTION %@: %@",
	        [names objectAtIndex:i], folder];
      }
      continue;
    }
    
    [ma addObject:folder];
  }
  if (debugBlocks)
    [self logWithFormat:@"  returning: %@ %@", _object, ma];
  return ma;
}

/* navigation nodes */

- (BOOL)isRootObject:(id)_object {
  if (![_object isNotNull]) {
    [self warnWithFormat:@"(%s): got to root by nil lookup ...",
            __PRETTY_FUNCTION__];
    return YES;
  }

  if ([_object isKindOfClass:NSClassFromString(@"SOGoUserFolder")])
    return YES;
  
  return [_object isKindOfClass:NSClassFromString([self rootClassName])];
}

- (NSString *)treeNavigationLinkForObject:(id)_object
				  atDepth:(int)_depth
{
  NSMutableString *link;
  int i;
  
  link = [NSMutableString new];
  [link autorelease];

  for (i = 0; i < _depth; i++)
    [link appendString: @"../"];

  [link appendFormat: @"%@/%@",
	[_object nameInContainer],
	[self treeFolderAction]];
  
  return link;
}

- (void) getTitle: (NSString **)_t
       folderType: (NSString **)_ft
	  andIcon: (NSString **)_icon
	forObject: (id)_object
{
  // TODO: need to refactor for reuse!
  NSString *ftype;
  unsigned len;

//   if ([_object respondsToSelector: @selector (outlookFolderClass)])
//     ftype = [_object outlookFolderClass];
//   else
    ftype = [_object valueForKey:@"outlookFolderClass"];
  len = [ftype length];
  
  *_ft = nil;

  switch (len) {
  case 8:
    if ([ftype isEqualToString:@"IPF.Sent"]) {
      *_t = [self labelForKey:@"SentFolderName"];
      *_icon = @"tbtv_sent_17x17.gif";
      *_ft = @"sent";
      return;
    }
    break;
  case 9:
    if ([ftype isEqualToString:@"IPF.Inbox"]) {
      *_t = [self labelForKey:@"InboxFolderName"];
      *_icon = @"tbtv_inbox_17x17.gif";
      *_ft = @"inbox";
      return;
    }
    if ([ftype isEqualToString:@"IPF.Trash"]) {
      *_t = [self labelForKey:@"TrashFolderName"];
      *_icon = @"tbtv_trash_17x17.gif";
      *_ft = @"trash";
      return;
    }
    break;
  case 10:
    if ([ftype isEqualToString:@"IPF.Drafts"]) {
      *_t = [self labelForKey:@"DraftsFolderName"];
      *_icon = @"tbtv_drafts_17x17.gif";
      *_ft = @"drafts";
      return;
    }
//     if ([ftype isEqualToString:@"IPF.Filter"]) {
//       *_t = [self labelForKey:@"SieveFolderName"];
//       *_icon = nil;
//       *_ft = @"sieve";
//       return;
//     }
    break;
  }

  *_t    = [_object davDisplayName];
  *_icon = nil;
  
  if ([_object isKindOfClass:NSClassFromString(@"SOGoMailFolder")])
    *_icon = nil;
  else if ([_object isKindOfClass:NSClassFromString(@"SOGoMailAccount")]) {
    *_icon = @"tbtv_account_17x17.gif";

    *_ft = @"account";
    
    /* title processing is somehow Agenor specific and should be done in UI */
    *_t = [[_object nameInContainer] titleForSOGoIMAP4String];
  }
  else if ([_object isKindOfClass:NSClassFromString(@"SOGoMailAccounts")])
    *_icon = @"tbtv_account_17x17.gif";
  else if ([_object isKindOfClass:NSClassFromString(@"SOGoUserFolder")])
    *_icon = @"tbtv_inbox_17x17.gif";
  else {
    // TODO: use drafts icon for other SOGo folders
    *_icon = @"tbtv_drafts_17x17.gif";
  }
}

- (UIxMailTreeBlock *) treeNavigationBlockForLeafNode: (id) _o
					      atDepth: (int) _d
{
  UIxMailTreeBlock *md;
  NSString *n, *i, *ft;
  id blocks;

  /* 
     Trigger plus in treeview if it has subfolders. It is an optimization that
     we do not generate blocks for folders which are not displayed anyway.
  */
  blocks = [[_o toManyRelationshipKeys] count] > 0
    ? UIxMailTreeHasChildrenMarker
    : nil;

  [self getTitle: &n folderType: &ft andIcon: &i forObject:_o];

  md = [UIxMailTreeBlock blockWithName: nil
			 title: n
			 iconName: i
			 link: [self treeNavigationLinkForObject:_o atDepth:_d]
			 isPathNode:NO
			 isActiveNode:NO
			 childBlocks: blocks];
  return md;
}

- (UIxMailTreeBlock *)treeNavigationBlockForRootNode:(id)_object {
  /*
     This generates the block for the root object (root of the tree, we get
     there by walking up the chain starting with the client object).
  */
  UIxMailTreeBlock *md;
  NSMutableArray   *blocks;
  NSArray          *folders;
  NSString         *title, *icon, *ft;
  unsigned         i, count;

  if (debugBlocks) {
    [self logWithFormat:@"block for root node 0x%08X<%@>", 
	    _object, NSStringFromClass([_object class])];
  }
  
  /* process child folders */
  
  folders = [self fetchSubfoldersOfObject:_object];
  count   = [folders count];
  blocks  = [NSMutableArray arrayWithCapacity:count];
  for (i = 0; i < count; i++) {
    id block;
    
    block = [self treeNavigationBlockForLeafNode: [folders objectAtIndex:i]
		  atDepth:0];
    if ([block isNotNull]) [blocks addObject:block];
  }
  if ([blocks count] == 0)
    blocks = nil;
  
  /* build block */
  
  [self getTitle:&title folderType: &ft andIcon:&icon forObject:_object];

  md = [UIxMailTreeBlock blockWithName: [_object nameInContainer]
			 title: title
			 iconName: icon
			 link: [@"../" stringByAppendingString:
				   [_object nameInContainer]]
			 isPathNode: YES
			 isActiveNode: YES
			 childBlocks: blocks];
  return md;
}

- (UIxMailTreeBlock *) fullTreeNavigationBlockForNode: (id)_object
{
  UIxMailTreeBlock *md;
  NSMutableArray   *blocks;
  NSArray          *folders;
  NSString         *title, *icon, *ft;
  unsigned         i, count;

  if (debugBlocks)
    [self logWithFormat:@"block for root node 0x%08X<%@>", 
	    _object, NSStringFromClass([_object class])];
  
  folders = [self fetchSubfoldersOfObject: _object];
  count   = [folders count];
  blocks  = [NSMutableArray arrayWithCapacity: count];
  for (i = 0; i < count; i++)
    {
      id block;
    
      block = [self fullTreeNavigationBlockForNode: [folders objectAtIndex:i]];
      if ([block isNotNull]) [blocks addObject:block];
    }

  if (![blocks count])
    blocks = nil;
  
  [self getTitle: &title folderType: &ft andIcon: &icon forObject: _object];
//   NSLog (@"*********** title = '%@'/icon = '%@'", title, icon);

  md = [UIxMailTreeBlock blockWithName: [_object nameInContainer]
			 title: title
			 iconName: icon
			 link: [@"../" stringByAppendingString:
				   [_object nameInContainer]]
			 isPathNode: YES
			 isActiveNode: YES
			 childBlocks: blocks];
  [md setFolderType: ft];

  return md;
}

- (UIxMailTreeBlock *) treeNavigationBlockForActiveNode: (id) _object
{
  /* 
     This generates the block for the clientObject (the object which has the 
     focus)
  */
  UIxMailTreeBlock *md;
  NSMutableArray   *blocks;
  NSArray  *folders;
  NSString *title, *icon, *ft;
  unsigned i, count;

  // TODO: maybe we can join the two implementations, this might not be
  //       necessary
  if ([self isRootObject:_object]) /* we are at the top */
    return [self treeNavigationBlockForRootNode:_object];
  
  if (debugBlocks) {
    [self logWithFormat:@"block for active node 0x%08X<%@> - %@", 
	    _object, NSStringFromClass([_object class]),
	    [_object davDisplayName]];
  }
  
  /* process child folders */
  
  folders = [self fetchSubfoldersOfObject:_object];
  count   = [folders count];
  blocks  = [NSMutableArray arrayWithCapacity:count];
  for (i = 0; i < count; i++) {
    UIxMailTreeBlock *block;
    
    block = [self treeNavigationBlockForLeafNode: [folders objectAtIndex:i]
		  atDepth: 0];
    if ([block isNotNull]) [blocks addObject:block];
  }
  if ([blocks count] == 0) blocks = nil;

  /* build block */
  
  [self getTitle:&title folderType: &ft andIcon:&icon forObject:_object];
  md = [UIxMailTreeBlock blockWithName: [_object nameInContainer]
			 title: title
			 iconName: icon
			 link: @"."
			 isPathNode: YES
			 isActiveNode: YES
			 childBlocks: blocks];
  return md;
}

- (UIxMailTreeBlock *)
  treeNavigationBlockForObject: (id) _object
	  withActiveChildBlock: (UIxMailTreeBlock *) _activeChildBlock 
			 depth: (int) _depth
{
  /*
    Note: 'activeChildBlock' here doesn't mean that the block is the selected
          folder in the tree. Its just the element which is active in the
	  list of subfolders.
  */
  UIxMailTreeBlock *resultBlock;
  NSMutableArray   *blocks;
  NSString         *activeName;
  NSArray          *folders;
  NSString         *title, *icon, *ft;
  unsigned         i, count;
  
  activeName = [_activeChildBlock valueForKey:@"name"];
  
  /* process child folders */
  
  folders = [self fetchSubfoldersOfObject:_object];
  count   = [folders count];
  blocks  = [NSMutableArray arrayWithCapacity:count == 0 ? 1 : count];
  for (i = 0; i < count; i++) {
    UIxMailTreeBlock *block;
    id folder;
    
    folder = [folders objectAtIndex:i];
    block = [activeName isEqualToString:[folder nameInContainer]]
      ? _activeChildBlock
      : [self treeNavigationBlockForLeafNode: folder
	      atDepth:_depth];
    
    if ([block isNotNull]) [blocks addObject:block];
  }
  if ([blocks count] == 0) {
    if (_activeChildBlock != nil) // if the parent has no proper fetchmethod!
      [blocks addObject:_activeChildBlock];
    else
      blocks = nil;
  }

  /* build block */
  
  [self getTitle:&title folderType: &ft andIcon:&icon forObject:_object];
  resultBlock
    = [UIxMailTreeBlock blockWithName: [_object nameInContainer]
			title: title
			iconName: icon
			link:
			  [self treeNavigationLinkForObject: _object 
				atDepth: (_depth + 1)]
			isPathNode:YES isActiveNode:NO
			childBlocks:blocks];
  
  /* recurse up unless we are at the root */

  if ([self isRootObject:_object]) /* we are at the top */
    return resultBlock;
  
  return [self treeNavigationBlockForObject:[_object container] 
	       withActiveChildBlock:resultBlock
	       depth:(_depth + 1)];
}

- (UIxMailTreeBlock *)buildNavigationNodesForObject:(id)_object {
  /*
    This is the top-level 'flattening' method. The _object is the active
    object in the tree, that is, usually a "current folder".
    
    The tree will show:
    all subfolders of the current folder,
    all parent folders of the current folder up to some root,
    all siblings along the parent chain.
  */
  UIxMailTreeBlock *block;
  
  /* 
     This is the cursor, we create nodes below that for direct subfolders
  */
  if (debugBlocks) [self logWithFormat:@"ACTIVE block ..."];
  block = [self treeNavigationBlockForActiveNode:_object];
  if (debugBlocks) [self logWithFormat:@"  ACTIVE block: %@", block];
  
  if ([self isRootObject:_object]) {
    if (debugBlocks) [self logWithFormat:@"  active block is root."];
    return block;
  }
  
  /* 
     The following returns the root block. It calculates the chain up to the
     root folder starting with the parent of the current object.
  */
  if (debugBlocks) [self logWithFormat:@"ACTIVE parent block ..."];
  block = [self treeNavigationBlockForObject:[_object container] 
		withActiveChildBlock:block
		depth: 1];
  if (debugBlocks) [self logWithFormat:@"done: %@", block];
  return block;
}

/* tree */

- (NSArray *)rootNodes {
  UIxMailTreeBlock *navNode;
  
  if (self->rootNodes != nil)
    return self->rootNodes;
  
  navNode = [self buildNavigationNodesForObject:[self clientObject]];
  
  if ([navNode hasChildren] && [navNode areChildrenLoaded])
    self->rootNodes = [[navNode children] retain];
  else if (navNode)
    self->rootNodes = [[NSArray alloc] initWithObjects:&navNode count:1];
  
  return self->rootNodes;
}

- (int) addNodes: (NSArray *) nodes
        atSerial: (int) startSerial
       forParent: (int) parent
    withRootName: (NSString *) rootName
         toArray: (NSMutableArray *) array
{
  unsigned int count, max, currentSerial;
  UIxMailTreeBlock *curNode;
  NSString *fullName;

  max = [nodes count];
  currentSerial = startSerial;
  for (count = 0; count < max; count++)
    {
      curNode = [nodes objectAtIndex: count];
      fullName = [rootName stringByAppendingFormat: @"/%@", [curNode name]];
      [curNode setName: fullName];
      [curNode setSerial: currentSerial];
      [curNode setParent: parent];
      [array addObject: curNode];
      if ([curNode hasChildren])
        currentSerial = [self addNodes: [curNode children]
                              atSerial: currentSerial + 1
                              forParent: currentSerial
                              withRootName: fullName
                              toArray: array];
      else
        currentSerial++;
    }

  return currentSerial;
}

- (NSArray *) flattenedNodes
{
  NSMutableArray *flattenedBlocks = nil;
  NSString *userKey;
  UIxMailTreeBlock *rootNode; // , *curNode;
  id mailAccounts;
//   unsigned int count, max;

  userKey = [[self user] login];
  flattenedBlocks = [flattenedNodes objectForKey: userKey];
  if (!flattenedBlocks)
    {
      flattenedBlocks = [NSMutableArray new];

      if (![[self clientObject] isKindOfClass: NSClassFromString(@"SOGoMailAccounts")])
	mailAccounts = [[self clientObject] mailAccountsFolder];
      else
	mailAccounts = [self clientObject];

      rootNode = [self fullTreeNavigationBlockForNode: mailAccounts];
      [self addNodes: [rootNode children]
	    atSerial: 1
	    forParent: 0
	    withRootName: @""
	    toArray: flattenedBlocks];

      [flattenedNodes setObject: flattenedBlocks forKey: userKey];
//       max = [flattenedBlocks count];
//       for (count = 0; count < max; count++)
// 	{
// 	  curNode = [flattenedBlocks objectAtIndex: count];
// 	  NSLog (@"%d: %@/%@", count, [curNode title], [curNode iconName]);
// 	}
    }

  return flattenedBlocks;
}

/* notifications */

- (void)sleep {
  [self->item      release]; self->item      = nil;
  [self->rootNodes release]; self->rootNodes = nil;
  [super sleep];
}

@end /* UIxMailTree */


@implementation NSString(DotCutting)

- (NSString *)stringByCuttingOffAtDotsWhenExceedingLength:(int)_maxLength {
  NSRange  r, r2;
  NSString *s;
  int      i;
  
  if ([self length] <= _maxLength) /* if length is small, return as is */
    return self;
  
  if ((r = [self rangeOfString:@"."]).length == 0)
    /* no dots in share, return even if longer than boundary */
    return self;
  
  s = self;
  i  = r.location + r.length;
  r2 = [s rangeOfString:@"." options:NSLiteralSearch 
	  range:NSMakeRange(i, [s length] - i)];
    
  if (r2.length > 0) {
    s = [s substringToIndex:r2.location];
    if ([s length] <= _maxLength) /* if length is small, return as is */
      return s;
  }
  
  /* no second dot, and the whole was too long => cut off after first */
  return [s substringToIndex:r.location];
}

- (NSString *)titleForSOGoIMAP4String {
  /* 
     eg:
       guizmo.g.-.baluh.hommes.tests-montee-en-charge-ogo@\
       amelie-01.ac.melanie2.i2
  */
  static int CutOffLength = 16;
  NSString *s;
  NSRange  r;
  
  s = self;
  
  /* check for connect strings without hostnames */
  
  r = [s rangeOfString:@"@"];
  if (r.length == 0) {
    /* no login provide, just use the hostname (without domain) */
    r = [s rangeOfString:@"."];
    return r.length > 0 ? [s substringToIndex:r.location] : s;
  }
  
  s = [s substringToIndex:r.location];
  
  /* check for shares */
  
  r = [s rangeOfString:@".-."];
  if (r.length > 0) {
    /* eg: 'baluh.hommes.tests-montee-en-charge-ogo' */
    s = [s substringFromIndex:(r.location + r.length)];
    
    return [s stringByCuttingOffAtDotsWhenExceedingLength:CutOffLength];
  }
  
  /* just the login name, possibly long (test.et.di.cete-lyon) */
  return [s stringByCuttingOffAtDotsWhenExceedingLength:CutOffLength];
}

@end /* NSString(DotCutting) */