/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright (ñ) 2012-15 Miranda NG project (http://miranda-ng.org),
Copyright (c) 2000-08 Miranda ICQ/IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.

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.
*/

#include "hdr/modern_commonheaders.h"
#include "hdr/modern_clc.h"
#include "hdr/modern_commonprototypes.h"

#define CacheArrSize 255
ClcGroup *CacheIndex[CacheArrSize] = { NULL };
bool CacheIndexClear = TRUE;

/* the CLC uses 3 different ways to identify elements in its list, this file
contains routines to convert between them.

1) ClcContact/ClcGroup pair. Only ever used within the duration
of a single operation, but used at some point in nearly everything
2) index integer. The 0-based number of the item from the top. Only visible
items are counted (ie not closed groups). Used for saving selection and drag
highlight
3) hItem handle. Either the hContact or (hGroup|HCONTACT_ISGROUP). Used
exclusively externally

1->2: cliGetRowsPriorTo()
1->3: ContactToHItem()
3->1: FindItem()
2->1: GetRowByIndex()
*/

int GetContactIndex(ClcGroup *group, ClcContact *contact)
{
	for (int i = 0; i < group->cl.count; i++)
		if (group->cl.items[i]->hContact == contact->hContact)  return i;
	return -1;
}

int cliGetRowsPriorTo(ClcGroup *group, ClcGroup *subgroup, int contactIndex)
{
	int count = 0;
	int subcontactscount = 0;
	BYTE k = db_get_b(NULL, "CLC", "MetaExpanding", SETTING_METAEXPANDING_DEFAULT);
	group->scanIndex = 0;
	for (;;) {
		if (group->scanIndex == group->cl.count) {
			group = group->parent;
			if (group == NULL) break;
			group->scanIndex++;
			continue;
		}
		if (group == subgroup && contactIndex - subcontactscount == group->scanIndex) return count;
		count++;

		ClcContact *c = group->cl.items[group->scanIndex];
		if (c->type == CLCIT_GROUP) {
			if (c->group == subgroup && contactIndex == -1)
				return count - 1;
			
			if (c->group->expanded) {
				group = c->group;
				group->scanIndex = 0;
				subcontactscount = 0;
				continue;
			}
		}
		if (group == subgroup) {
			if (c->type == CLCIT_CONTACT && c->SubAllocated) {
				int rows = (c->SubAllocated*c->SubExpanded*k);
				if (group->scanIndex + rows >= contactIndex)
					return count + (contactIndex - group->scanIndex) - 1;
			}
		}
		if (c->type == CLCIT_CONTACT) {
			count += (c->SubAllocated * c->SubExpanded * k);
			subcontactscount += (c->SubAllocated * c->SubExpanded * k);
		}
		group->scanIndex++;
	}
	return -1;
}

int cliFindItem(HWND hwnd, ClcData *dat, DWORD dwItem, ClcContact **contact, ClcGroup **subgroup, int *isVisible)
{
	return FindItem(hwnd, dat, dwItem, contact, subgroup, isVisible, FALSE);
}

int FindItem(HWND hwnd, ClcData *dat, DWORD dwItem, ClcContact **contact, ClcGroup **subgroup, int *isVisible, BOOL isIgnoreSubcontacts)
{
	int index = 0, i;
	int nowVisible = 1;

	ClcGroup *group = &dat->list;
	group->scanIndex = 0;
	group = &dat->list;

	for (;;) {
		if (group->scanIndex == group->cl.count) {
			ClcGroup *tgroup;
			group = group->parent;
			if (group == NULL)
				break;

			nowVisible = 1;
			for (tgroup = group; tgroup; tgroup = tgroup->parent) {
				if (!tgroup->expanded) {
					nowVisible = 0;
					break;
				}
			}
			group->scanIndex++;
			continue;
		}
		if (nowVisible) index++;

		ClcContact *c = group->cl.items[group->scanIndex];
		if ((IsHContactGroup(dwItem) && c->type == CLCIT_GROUP && (dwItem & ~HCONTACT_ISGROUP) == c->groupId) ||
			(IsHContactContact(dwItem) && c->type == CLCIT_CONTACT && c->hContact == dwItem) ||
			(IsHContactInfo(dwItem) && c->type == CLCIT_INFO && c->hContact == (dwItem & ~HCONTACT_ISINFO))) {
			if (isVisible) {
				if (!nowVisible) *isVisible = 0;
				else {
					int posy = cliGetRowTopY(dat, index + 1);
					if (posy < dat->yScroll)
						*isVisible = 0;
					else {
						RECT clRect;
						GetClientRect(hwnd, &clRect);
						if (posy >= dat->yScroll + clRect.bottom) *isVisible = 0;
						else *isVisible = 1;
					}
				}
			}
			if (contact) *contact = c;
			if (subgroup) *subgroup = group;

			return 1;
		}

		if (!isIgnoreSubcontacts && IsHContactContact(dwItem) && c->type == CLCIT_CONTACT && c->SubAllocated > 0) {
			for (i = 0; i < c->SubAllocated; i++) {
				if (c->subcontacts[i].hContact == dwItem) {
					if (contact) *contact = &c->subcontacts[i];
					if (subgroup) *subgroup = group;
					return 1;
				}
			}
		}

		if (c->type == CLCIT_GROUP) {
			group = c->group;
			group->scanIndex = 0;
			nowVisible &= group->expanded;
			continue;
		}
		group->scanIndex++;
	}

	if (isVisible) *isVisible = FALSE;
	if (contact)   *contact = NULL;
	if (subgroup)  *subgroup = NULL;
	return 0;
}

void ClearRowByIndexCache()
{
	if (!CacheIndexClear) {
		memset(CacheIndex, 0, sizeof(CacheIndex));
		CacheIndexClear = TRUE;
	}
}

int cliGetRowByIndex(ClcData *dat, int testindex, ClcContact **contact, ClcGroup **subgroup)
{
	int index = 0, i;
	ClcGroup *group = &dat->list;

	if (testindex < 0) return (-1);

	group->scanIndex = 0;
	for (;;) {
		if (group->scanIndex == group->cl.count) {
			group = group->parent;
			if (group == NULL) break;
			group->scanIndex++;
			continue;
		}

		if (index > 0 && index < CacheArrSize) {
			CacheIndex[index] = group;
			CacheIndexClear = FALSE;
		}

		ClcContact *c = group->cl.items[group->scanIndex];
		if (testindex == index) {
			if (contact) *contact = c;
			if (subgroup) *subgroup = group;
			return index;
		}

		if (c->type == CLCIT_CONTACT)
			if (c->SubAllocated)
				if (c->SubExpanded && dat->expandMeta) {
					for (i = 0; i < c->SubAllocated; i++) {
						if ((index>0) && (index < CacheArrSize)) {
							CacheIndex[index] = group;
							CacheIndexClear = FALSE;
						}
						index++;
						if (testindex == index) {
							if (contact) {
								*contact = &c->subcontacts[i];
								(*contact)->subcontacts = c;
							}

							if (subgroup) *subgroup = group;
							return index;
						}
					}
				}

		index++;
		if (c->type == CLCIT_GROUP && c->group->expanded) {
			group = c->group;
			group->scanIndex = 0;
			continue;
		}
		group->scanIndex++;
	}
	return -1;
}

HANDLE ContactToHItem(ClcContact *contact)
{
	switch (contact->type) {
	case CLCIT_CONTACT:
		return (HANDLE)contact->hContact;
	case CLCIT_GROUP:
		return (HANDLE)(contact->groupId | HCONTACT_ISGROUP);
	case CLCIT_INFO:
		return (HANDLE)((DWORD_PTR)contact->hContact | HCONTACT_ISINFO);
	}
	return NULL;
}

HANDLE ContactToItemHandle(ClcContact *contact, DWORD *nmFlags)
{
	switch (contact->type) {
	case CLCIT_CONTACT:
		return (HANDLE)contact->hContact;
	case CLCIT_GROUP:
		if (nmFlags) *nmFlags |= CLNF_ISGROUP;
		return (HANDLE)contact->groupId;
	case CLCIT_INFO:
		if (nmFlags) *nmFlags |= CLNF_ISINFO;
		return (HANDLE)((DWORD_PTR)contact->hContact | HCONTACT_ISINFO);
	}
	return NULL;
}