/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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 3 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, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
#include "hsStringTable.h"
#include <stdlib.h>
#if HS_BUILD_FOR_UNIX
#include <ctype.h>
#endif
//
// hsStringTable
//

hsStringTable::Node::Node(char c) : sib(0), kid(0), chr(c), data(0) {};
hsStringTable::Node::~Node() { };
void* hsStringTable::Node::GetData() { return data; }
void hsStringTable::Node::SetData(void* v) { data = v; }

hsStringTable::~hsStringTable() 
{
    RemoveNode(root.kid);
}

void hsStringTable::Reset() 
{
    RemoveNode(root.kid);
    root.kid = nil;
}


//
// Find a the Node associated with a given string
//
hsStringTable::Node* hsStringTable::Find(const char* str)
{
    return (str && *str) ? FindRecur(root.kid, str) : nil;
}

//
// Find the unique node matching the given prefix. Returns the node
// at the first point where a unique path can not be determined
// char* str is filled out with the matching path
//
hsStringTable::Node* hsStringTable::FindPartial(char* str, int32_t len) const
{
    return (str && *str) ? FindPartialRecur(root.kid, str, len) : nil;
}

//
// Find and Add if needs a node for str and register it with data
//
void hsStringTable::Register(const char* str, void* data) 
{
    Node* node = FindRecur(root.kid, str, true);
    if (!node) 
    {
        node = AddRecur(&root, str);
    }
    node->SetData(data);
}

//
// Iterate through the tree and call the callback function on each child node
// of the fromNode (or the root if fromNode is nil)
//
hsBool hsStringTable::Iterate(hsStringTableCallback* callback, Node* fromNode)
{
    if (!fromNode)
        fromNode = &root;
    return IterateRecur(fromNode->kid,callback);
}

//
// Recursively find node, create if needed?
//
hsStringTable::Node* hsStringTable::FindRecur(Node* root, const char* str, hsBool createIfNeeded)
{
    if (!root || !str) return nil;
    if (tolower(root->chr)==tolower(*str)) 
    {
        if (*(str+1)) 
        {
            Node* node = FindRecur(root->kid, str+1, createIfNeeded);
            if (!node && createIfNeeded) node = AddRecur(root, str+1);
            return node;
        } 
        else 
        {
            return root;
        }
    } 
    else 
    {
        return FindRecur(root->sib,str,createIfNeeded);
    }
}

//
// Recursively find the unique partial match
//
hsStringTable::Node* hsStringTable::FindPartialRecur(Node* root, char* str, int32_t len) const
{
    if (!root || !str) 
    {
        return nil;
    }

    if (tolower(root->chr)==tolower(*str)) 
    {
        if (len) 
        {
            *str = root->chr;
        }
        
        if (*(str+1)) 
        {
            Node* node = FindPartialRecur(root->kid,str+1,len-1);
            //if (!node) node = AddRecur(root,str+1);
            return node;
        } 
        else 
        {
            return FindLeafRecur(root, str, len);
        }
    } 
    else 
    {
        return FindPartialRecur(root->sib, str, len);
    }
}

//
// Follow the current node as far as possible towards a unique leaf
//
hsStringTable::Node* hsStringTable::FindLeafRecur(Node* root, char* str, int32_t len) const
{
    if (root->data || !root->kid || root->kid->sib) 
    {
        if (len) 
        {
            *(str+1) = 0;
        }
        return root;
    } 
    else 
    {
        if (len) 
        {
            *(str+1) = len>1 ? root->kid->chr : 0;
        }
        return FindLeafRecur(root->kid,str+1,len-1);
    }
}


//
// Add a string to the tree
//
hsStringTable::Node* hsStringTable::AddRecur(Node* root, const char* str) 
{
    Node* node = new Node(*str);
    node->sib = root->kid;
    root->kid = node;
    if (*(str+1)) return AddRecur(node,str+1);
    else return node;
}

//
// Remove a node recursive from the tree
//
void hsStringTable::RemoveNode(Node* root) 
{
    if (!root) return;
    RemoveNode(root->kid);
    RemoveNode(root->sib);
    delete root;
}

//
// Recurse through tree and call callback on each node
//
hsBool hsStringTable::IterateRecur(Node* root, hsStringTableCallback* callback)
{
    if (!root)
        return true;
    if (root->data)
    {
        if (!callback(root))
            return false;
    }
    if (root->kid)
    {
        if (!IterateRecur(root->kid,callback))
            return false;
    }
    if (root->sib)
    {
        if (!IterateRecur(root->sib,callback))
            return false;
    }
    return true;
}
