/**

 * vim: set ts=4 :

 * =============================================================================

 * SourceMod

 * Copyright (C) 2004-2007 AlliedModders LLC.  All rights reserved.

 * =============================================================================

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * 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/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#include <time.h>

#include <stdarg.h>

#include <stdlib.h>

#include "MenuManager.h"

#include "MenuVoting.h"

#include "sm_stringutil.h"

#include "sourcemm_api.h"

#include "PlayerManager.h"

#include "MenuStyle_Valve.h"

#include "ShareSys.h"

#include "HandleSys.h"

#include "sourcemm_api.h"

MenuManager g_Menus;

VoteMenuHandler s_VoteHandler;

ConVar sm_menu_sounds("sm_menu_sounds", "1", 0, "Sets whether SourceMod menus play trigger sounds");

MenuManager::MenuManager()

{

	m_Styles.push_back(&g_ValveMenuStyle);

	SetDefaultStyle(&g_ValveMenuStyle);

}

void MenuManager::OnSourceModAllInitialized()

{

	g_ShareSys.AddInterface(NULL, this);

	HandleAccess access;

	g_HandleSys.InitAccessDefaults(NULL, &access);

	/* Deny cloning to menus */

	access.access[HandleAccess_Clone] = HANDLE_RESTRICT_OWNER|HANDLE_RESTRICT_IDENTITY;

	m_MenuType = g_HandleSys.CreateType("IBaseMenu", this, 0, NULL, &access, g_pCoreIdent, NULL);

	/* Also deny deletion to styles */

	access.access[HandleAccess_Delete] = HANDLE_RESTRICT_OWNER|HANDLE_RESTRICT_IDENTITY;

	m_StyleType = g_HandleSys.CreateType("IMenuStyle", this, 0, NULL, &access, g_pCoreIdent, NULL);

}

void MenuManager::OnSourceModAllShutdown()

{

	g_HandleSys.RemoveType(m_MenuType, g_pCoreIdent);

	g_HandleSys.RemoveType(m_StyleType, g_pCoreIdent);

}

void MenuManager::OnHandleDestroy(HandleType_t type, void *object)

{

	if (type == m_MenuType)

	{

		IBaseMenu *menu = (IBaseMenu *)object;

		menu->Destroy(false);

	} else if (type == m_StyleType) {

		/* Do nothing */

	}

}

Handle_t MenuManager::CreateMenuHandle(IBaseMenu *menu, IdentityToken_t *pOwner)

{

	if (m_MenuType == NO_HANDLE_TYPE)

	{

		return BAD_HANDLE;

	}

	return g_HandleSys.CreateHandle(m_MenuType, menu, pOwner, g_pCoreIdent, NULL);

}

Handle_t MenuManager::CreateStyleHandle(IMenuStyle *style)

{

	if (m_StyleType == NO_HANDLE_TYPE)

	{

		return BAD_HANDLE;

	}

	return g_HandleSys.CreateHandle(m_StyleType, style, g_pCoreIdent, g_pCoreIdent, NULL);

}

HandleError MenuManager::ReadMenuHandle(Handle_t handle, IBaseMenu **menu)

{

	HandleSecurity sec;

	sec.pIdentity = g_pCoreIdent;

	sec.pOwner = NULL;

	return g_HandleSys.ReadHandle(handle, m_MenuType, &sec, (void **)menu);

}

HandleError MenuManager::ReadStyleHandle(Handle_t handle, IMenuStyle **style)

{

	HandleSecurity sec;

	sec.pIdentity = g_pCoreIdent;

	sec.pOwner = g_pCoreIdent;

	return g_HandleSys.ReadHandle(handle, m_StyleType, &sec, (void **)style);

}

bool MenuManager::SetDefaultStyle(IMenuStyle *style)

{

	if (!style)

	{

		return false;

	}

	m_pDefaultStyle = style;

	return true;

}

IMenuStyle *MenuManager::GetStyle(unsigned int index)

{

	if (index >= GetStyleCount())

	{

		return NULL;

	}

	return m_Styles[index];

}

void MenuManager::AddStyle(IMenuStyle *style)

{

	m_Styles.push_back(style);

}

unsigned int MenuManager::GetStyleCount()

{

	return (unsigned int)m_Styles.size();

}

IMenuStyle *MenuManager::FindStyleByName(const char *name)

{

	unsigned int count = GetStyleCount();

	for (unsigned int i=0; i<count; i++)

	{

		IMenuStyle *ptr = GetStyle(i);

		if (strcasecmp(ptr->GetStyleName(), name) == 0)

		{

			return ptr;

		}

	}

	return NULL;

}

inline bool IsSlotItem(IMenuPanel *display,

					   unsigned int style)

{

	if (!display->CanDrawItem(style))

	{

	return false;

	}

	if ((style & ITEMDRAW_IGNORE) == ITEMDRAW_IGNORE)

	{

		return false;

	}

	if (style & ITEMDRAW_RAWLINE)

	{

		return false;

	}

	return true;

}

IMenuPanel *MenuManager::RenderMenu(int client, menu_states_t &md, ItemOrder order)

{

	IBaseMenu *menu = md.menu;

	if (!menu)

	{

		return NULL;

	}

	struct

	{

		unsigned int position;

		ItemDrawInfo draw;

	} drawItems[10];

	/* Figure out how many items to draw */

	IMenuStyle *style = menu->GetDrawStyle();

	unsigned int pgn = menu->GetPagination();

	unsigned int maxItems = style->GetMaxPageItems();

	bool exitButton = (menu->GetMenuOptionFlags() & MENUFLAG_BUTTON_EXIT) == MENUFLAG_BUTTON_EXIT;

	if (pgn != MENU_NO_PAGINATION)

	{

		maxItems = pgn;

	}

	else if (exitButton)

	{

		maxItems--;

	}

	/* This is very not allowed! */

	if (maxItems < 2)

	{

		return NULL;

	}

	unsigned int totalItems = menu->GetItemCount();

	unsigned int startItem = 0;

	/* For pagination, find the starting point. */

	if (pgn != MENU_NO_PAGINATION)

	{

		if (order == ItemOrder_Ascending)

		{

			startItem = md.lastItem;

			/* This shouldn't happen with well-coded menus.

			 * If the item is out of bounds, switch the order to

			 * Items_Descending and make us start from the top.

			 */

			if (startItem >= totalItems)

			{

				startItem = totalItems - 1;

				order = ItemOrder_Descending;

			}

		}

		else if (order == ItemOrder_Descending)

		{

			startItem = md.firstItem;

			/* This shouldn't happen with well-coded menus.

			 * If searching backwards doesn't give us enough room,

			 * start from the beginning and change to ascending.

			 */

			if (startItem <= maxItems)

			{

				startItem = 0;

				order = ItemOrder_Ascending;

			}

		}

	}

	/* Get our Display pointer and initialize some crap */

	IMenuPanel *panel = menu->CreatePanel();

	IMenuHandler *mh = md.mh;

	bool foundExtra = false;

	unsigned int extraItem = 0;

	if (panel == NULL)

	{

		return NULL;

	}

	/**

	 * We keep searching until:

	 * 1) There are no more items

	 * 2) We reach one OVER the maximum number of slot items

	 * 3) We have reached maxItems and pagination is MENU_NO_PAGINATION

	 */

	unsigned int i = startItem;

	unsigned int foundItems = 0;

	while (totalItems)

	{

		ItemDrawInfo &dr = drawItems[foundItems].draw;

		/* Is the item valid? */

		if (menu->GetItemInfo(i, &dr) != NULL)

		{

			/* Ask the user to change the style, if necessary */

			mh->OnMenuDrawItem(menu, client, i, dr.style);

			/* Check if it's renderable */

			if (IsSlotItem(panel, dr.style))

			{

				/* If we've already found the max number of items,

				 * This means we should just cancel out and log our

				 * "last item."

				 */

				if (foundItems >= maxItems)

				{

					foundExtra = true;

					extraItem = i;

					break;

				}

				drawItems[foundItems++].position = i;

			}

		}

		/* If there's no pagination, stop once the menu is full. */

		if (pgn == MENU_NO_PAGINATION)

		{

			/* If we've filled up, then stop */

			if (foundItems >= maxItems)

			{

				break;

			}

		}

		/* If we're descending and this is the first item, stop */

		if (order == ItemOrder_Descending)

		{

			if (i == 0)

			{

				break;

			}

			i--;

		} 

		/* If we're ascending and this is the last item, stop */

		else if (order == ItemOrder_Ascending)

		{

			if (i >= totalItems - 1)

			{

				break;

			}

			i++;

		}

	}

	/* There were no items to draw! */

	if (!foundItems)

	{

		panel->DeleteThis();

		return NULL;

	}

	bool displayPrev = false;

	bool displayNext = false;

	/* This is an annoying process.

	 * Skip it for non-paginated menus, which get special treatment.

	 */

	if (pgn != MENU_NO_PAGINATION)

	{

		if (foundExtra)

		{

			if (order == ItemOrder_Descending)

			{

				displayPrev = true;

				md.firstItem = extraItem;

			}

			else if (order == ItemOrder_Ascending)

			{

				displayNext = true;

				md.lastItem = extraItem;

			}

		}

		unsigned int lastItem = 0;

		ItemDrawInfo dr;

		/* Find the last feasible item to search from. */

		if (order == ItemOrder_Descending)

		{

			lastItem = drawItems[0].position;

			if (lastItem >= totalItems - 1)

			{

				goto skip_search;

			}

			while (++lastItem < totalItems)

			{

				if (menu->GetItemInfo(lastItem, &dr) != NULL)

				{

					mh->OnMenuDrawItem(menu, client, lastItem, dr.style);

					if (IsSlotItem(panel, dr.style))

					{

						displayNext = true;

						md.lastItem = lastItem;

						break;

					}

				}

			}

		}

		else if (order == ItemOrder_Ascending)

		{

			lastItem = drawItems[0].position;

			if (lastItem == 0)

			{

				goto skip_search;

			}

			lastItem--;

			while (lastItem != 0)

			{

				if (menu->GetItemInfo(lastItem, &dr) != NULL)

				{

					mh->OnMenuDrawItem(menu, client, lastItem, dr.style);

					if (IsSlotItem(panel, dr.style))

					{

						displayPrev = true;

						md.firstItem = lastItem;

						break;

					}

				}

				lastItem--;

			}

		}

	}

skip_search:

	/* Draw the item according to the order */

	menu_slots_t *slots = md.slots;

	unsigned int position = 0;			/* Keep track of the last position */

	if (order == ItemOrder_Ascending)

	{

		md.item_on_page = drawItems[0].position;

		for (unsigned int i = 0; i < foundItems; i++)

		{

			ItemDrawInfo &dr = drawItems[i].draw;

			if ((position = mh->OnMenuDisplayItem(menu, client, panel, drawItems[i].position, dr)) == 0)

			{

				position = panel->DrawItem(dr);

			}

			if (position != 0)

			{

				slots[position].item = drawItems[i].position;

				slots[position].type = ItemSel_Item;

			}

		}

	}

	else if (order == ItemOrder_Descending)

	{

		unsigned int i = foundItems;

		/* NOTE: There will always be at least one item because

		 * of the check earlier.

		 */

		md.item_on_page = drawItems[foundItems - 1].position;

		while (i--)

		{

			ItemDrawInfo &dr = drawItems[i].draw;

			if ((position = mh->OnMenuDisplayItem(menu, client, panel, drawItems[i].position, dr)) == 0)

			{

				position = panel->DrawItem(dr);

			}

			if (position != 0)

			{

				slots[position].item = drawItems[i].position;

				slots[position].type = ItemSel_Item;

			}

		}

	}

	/* Now, we need to check if we need to add anything extra */

	if (pgn != MENU_NO_PAGINATION || exitButton)

	{

		bool canDrawDisabled = panel->CanDrawItem(ITEMDRAW_DISABLED|ITEMDRAW_CONTROL);

		bool exitBackButton = false;

		char text[50];

		if (pgn != MENU_NO_PAGINATION

			&& (menu->GetMenuOptionFlags() & MENUFLAG_BUTTON_EXITBACK) == MENUFLAG_BUTTON_EXITBACK)

		{

			exitBackButton = true;

		}

		/* Calculate how many items we are allowed for control stuff */

		unsigned int padding = style->GetMaxPageItems() - maxItems;

		/* Add the number of available slots */

		padding += (maxItems - foundItems);

		/* Someday, if we are able to re-enable this, we will be very lucky men. */

#if 0

		if (!style->FeatureExists(MenuStyleFeature_ImplicitExit))

		{

#endif

		/* Even if we don't draw an exit button, we invalidate the slot. */

		padding--;

#if 0

		} else {

			/* Otherwise, we don't draw anything and leave the slot available */

			exitButton = false;

		}

#endif

		if (pgn != MENU_NO_PAGINATION)

		{

			/* Subtract two slots for the displayNext/displayPrev padding */

			padding -= 2;

		}

		/* If we have an "Exit Back" button and the space to draw it, do so. */

		if (exitBackButton)

		{

			if (!displayPrev)

			{

				displayPrev = true;

			}

			else

			{

				exitBackButton = false;

			}

		}

		/**

		 * We allow next/prev to be undrawn if neither exists.

		 * Thus, we only need padding if one of them will be drawn,

		 * or the exit button will be drawn.

		 */

		ItemDrawInfo padItem(NULL, ITEMDRAW_SPACER);

		if (exitButton || (displayNext || displayPrev))

		{

			/* If there are no control options,

			 * Instead just pad with invisible slots.

			 */

			if (!displayPrev && !displayPrev)

			{

				padItem.style = ITEMDRAW_NOTEXT;

			}

			/* Add spacers so we can pad to the end */

			for (unsigned int i=0; i<padding; i++)

			{

				position = panel->DrawItem(padItem);

				slots[position].type = ItemSel_None;

			}

		}

		/* Put a fake spacer before control stuff, if possible */

		if ((displayPrev || displayNext) || exitButton)

		{

			ItemDrawInfo draw("", ITEMDRAW_RAWLINE|ITEMDRAW_SPACER);

			panel->DrawItem(draw);

		}

		ItemDrawInfo dr(text, 0);

		/**

		 * If we have one or the other, we need to have spacers for both.

		 */

		if (pgn != MENU_NO_PAGINATION)

		{

			if (displayPrev || displayNext)

			{

				/* PREVIOUS */

				ItemDrawInfo padCtrlItem(NULL, ITEMDRAW_SPACER|ITEMDRAW_CONTROL);

				if (displayPrev || canDrawDisabled)

				{

					if (exitBackButton)

					{

						CorePlayerTranslate(client, text, sizeof(text), "Back", NULL);

						dr.style = ITEMDRAW_CONTROL;

						position = panel->DrawItem(dr);

						slots[position].type = ItemSel_ExitBack;

					}

					else

					{

						CorePlayerTranslate(client, text, sizeof(text), "Previous", NULL);

						dr.style = (displayPrev ? 0 : ITEMDRAW_DISABLED)|ITEMDRAW_CONTROL;

						position = panel->DrawItem(dr);

						slots[position].type = ItemSel_Back;

					}

				}

				else if (displayNext || exitButton)

				{

					/* If we can't display this, and there is an exit button,

					 * we need to pad!

					 */

					position = panel->DrawItem(padCtrlItem);

					slots[position].type = ItemSel_None;

				}

				/* NEXT */

				if (displayNext || canDrawDisabled)

				{

					CorePlayerTranslate(client, text, sizeof(text), "Next", NULL);

					dr.style = (displayNext ? 0 : ITEMDRAW_DISABLED)|ITEMDRAW_CONTROL;

					position = panel->DrawItem(dr);

					slots[position].type = ItemSel_Next;

				}

				else if (exitButton)

				{

					/* If we can't display this,

					 * but there is an "exit" button, we need to pad!

					 */

					position = panel->DrawItem(padCtrlItem);

					slots[position].type = ItemSel_None;

				}

			}

			else

			{

				/* Otherwise, bump to two slots! */

				ItemDrawInfo numBump(NULL, ITEMDRAW_NOTEXT);

				position = panel->DrawItem(numBump);

				slots[position].type = ItemSel_None;

				position = panel->DrawItem(numBump);

				slots[position].type = ItemSel_None;