/*
 * Wolfenstein: Enemy Territory GPL Source Code
 * Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company.
 *
 * ET: Legacy
 * Copyright (C) 2012-2024 ET:Legacy team <mail@etlegacy.com>
 *
 * This file is part of ET: Legacy - http://www.etlegacy.com
 *
 * ET: Legacy 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.
 *
 * ET: Legacy 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 ET: Legacy. If not, see <http://www.gnu.org/licenses/>.
 *
 * In addition, Wolfenstein: Enemy Territory GPL Source Code is also
 * subject to certain additional terms. You should have received a copy
 * of these additional terms immediately following the terms and conditions
 * of the GNU General Public License which accompanied the source code.
 * If not, please request a copy in writing from id Software at the address below.
 *
 * id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
 */
/**
 * @file bg_animgroup.c
 * @brief Animation group code
 */

#include "../qcommon/q_shared.h"
#include "bg_public.h"
#include "bg_local.h"

#define MAX_ANIMPOOL_SIZE 5 * MAX_MODEL_ANIMATIONS

static animation_t animationPool[MAX_ANIMPOOL_SIZE];

/**
 * @brief BG_ClearAnimationPool
 */
void BG_ClearAnimationPool(void)
{
	Com_Memset(animationPool, 0, sizeof(animationPool));
}

#ifdef USE_MDXFILE
/**
 * @brief BG_RAG_FindFreeAnimation
 * @param[in] mdxFile
 * @param[in] name
 * @return
 */
static animation_t *BG_RAG_FindFreeAnimation(qhandle_t mdxFile, const char *name)
#else
static animation_t * BG_RAG_FindFreeAnimation(const char *mdxFileName, const char *name)
#endif // CGAMEDLL
{
	int i;

	for (i = 0; i < MAX_ANIMPOOL_SIZE; i++)
	{
#ifdef USE_MDXFILE
		if (animationPool[i].mdxFile == mdxFile && !Q_stricmp(animationPool[i].name, name))
		{
#else
		if (*animationPool[i].mdxFileName && !Q_stricmp(animationPool[i].mdxFileName, mdxFileName) && !Q_stricmp(animationPool[i].name, name))
		{
#endif // CGAMEDLL
			return(&animationPool[i]);
		}
	}

	for (i = 0; i < MAX_ANIMPOOL_SIZE; i++)
	{
#ifdef USE_MDXFILE
		if (!animationPool[i].mdxFile)
		{
			animationPool[i].mdxFile = mdxFile;
#else
		if (!animationPool[i].mdxFileName[0])
		{
			Q_strncpyz(animationPool[i].mdxFileName, mdxFileName, sizeof(animationPool[i].mdxFileName));
#endif // CGAMEDLL
			Q_strncpyz(animationPool[i].name, name, sizeof(animationPool[i].name));
			return(&animationPool[i]);
		}
	}

	return NULL;
}

/**
 * @brief BG_RAG_ParseError
 * @param[in] handle
 * @param[in] format
 * @return
 */
static qboolean BG_RAG_ParseError(int handle, const char *format, ...)
{
	int         line;
	char        filename[MAX_QPATH];
	va_list     argptr;
	static char string[4096];

	va_start(argptr, format);
	Q_vsnprintf(string, sizeof(string), format, argptr);
	va_end(argptr);

	filename[0] = '\0';
	line        = 0;
	trap_PC_SourceFileAndLine(handle, filename, &line);

	Com_Printf(S_COLOR_RED "ERROR: %s, line %d: %s\n", filename, line, string);

	trap_PC_FreeSource(handle);

	return qfalse;
}

/**
 * @brief BG_RAG_ParseAnimation
 * @param[in] handle
 * @param[in,out] animation
 * @return
 */
static qboolean BG_RAG_ParseAnimation(int handle, animation_t *animation)
{
	int  i;
	long l;

	animation->flags = 0;

	if (!PC_Int_Parse(handle, &animation->firstFrame))
	{
		return BG_RAG_ParseError(handle, "expected first frame integer");
	}

	if (!PC_Int_Parse(handle, &animation->numFrames))
	{
		return BG_RAG_ParseError(handle, "expected length integer");
	}

	if (!PC_Int_Parse(handle, &animation->loopFrames))
	{
		return BG_RAG_ParseError(handle, "expected looping integer");
	}

	if (!PC_PseudDec_Parse(handle, &l))
	{
		return BG_RAG_ParseError(handle, "expected fps pseudo decimal");
	}

	if (l == 0)
	{
		l = 100;
	}

	animation->frameLerp   = (int)(100000 / l);
	animation->initialLerp = (int)(100000 / l);

	if (!PC_Int_Parse(handle, &animation->moveSpeed))
	{
		return BG_RAG_ParseError(handle, "expected move speed integer");
	}

	if (!PC_Int_Parse(handle, &animation->animBlend))
	{
		return BG_RAG_ParseError(handle, "expected transition integer");
	}

	if (!PC_Int_Parse(handle, &i))
	{
		return BG_RAG_ParseError(handle, "expected reversed integer");
	}

	if (i == 1)
	{
		animation->flags |= ANIMFL_REVERSED;
	}

	if (!PC_Int_Parse(handle, &animation->priority))
	{
		return BG_RAG_ParseError(handle, "expected priority integer");
	}

	// calculate the duration
	animation->duration = animation->initialLerp
	                      + animation->frameLerp * animation->numFrames
	                      + animation->animBlend;

	// get the nameHash
	animation->nameHash = BG_StringHashValue(animation->name);

	// hacky-ish stuff
	if (!Q_strncmp(animation->name, "climb", 5))
	{
		animation->flags |= ANIMFL_LADDERANIM;
	}

	if (strstr(animation->name, "firing"))
	{
		animation->flags      |= ANIMFL_FIRINGANIM;
		animation->initialLerp = 40;
	}

	if (strstr(animation->name, "reload"))
	{
		animation->flags |= ANIMFL_RELOADINGANIM;
	}

	return qtrue;
}

#ifdef USE_MDXFILE
extern qhandle_t trap_R_RegisterModel(const char *name);
#endif // USE_MDXFILE;

/**
 * @brief BG_RAG_ParseAnimFile
 * @param[in] handle
 * @param[in,out] animModelInfo
 * @return
 */
static qboolean BG_RAG_ParseAnimFile(int handle, animModelInfo_t *animModelInfo)
{
	pc_token_t token;
#ifdef USE_MDXFILE
	qhandle_t mdxFile;
#else
	char mdxFileName[MAX_QPATH];
#endif // USE_MDXFILE

	animation_t *animation;

	if (!trap_PC_ReadToken(handle, &token))
	{
		return BG_RAG_ParseError(handle, "expected mdx filename");
	}

#ifdef USE_MDXFILE
	if (!(mdxFile = trap_R_RegisterModel(token.string)))
	{
		return BG_RAG_ParseError(handle, "failed to load %s", token.string);
	}
#else
	Q_strncpyz(mdxFileName, token.string, sizeof(mdxFileName));
#endif // USE_MDXFILE

	if (!trap_PC_ReadToken(handle, &token) || Q_stricmp(token.string, "{"))
	{
		return BG_RAG_ParseError(handle, "expected '{'");
	}

	while (1)
	{
		if (!trap_PC_ReadToken(handle, &token))
		{
			return BG_RAG_ParseError(handle, "unexpected EOF");
		}

		if (token.string[0] == '}')
		{
			break;
		}

#ifdef USE_MDXFILE
		if (!(animation = BG_RAG_FindFreeAnimation(mdxFile, token.string)))
		{
#else
		if (!(animation = BG_RAG_FindFreeAnimation(mdxFileName, token.string)))
		{
#endif // USE_MDXFILE
			return BG_RAG_ParseError(handle, "out of animation storage space");
		}

		Q_strncpyz(animation->name, token.string, sizeof(animation->name));
		Q_strlwr(animation->name);

		if (!BG_RAG_ParseAnimation(handle, animation))
		{
			return qfalse;
		}

		animModelInfo->animations[animModelInfo->numAnimations] = animation;
		animModelInfo->numAnimations++;
	}

	return qtrue;
}

/**
 * @brief BG_R_RegisterAnimationGroup
 * @param[in] filename
 * @param[out] animModelInfo
 * @return
 */
qboolean BG_R_RegisterAnimationGroup(const char *filename, animModelInfo_t *animModelInfo)
{
	pc_token_t token;
	int        handle;

	animModelInfo->numAnimations = 0;
	animModelInfo->footsteps     = FOOTSTEP_NORMAL;
	animModelInfo->gender        = GENDER_MALE;
	animModelInfo->isSkeletal    = qtrue;
	animModelInfo->version       = 3;
	//animModelInfo->numHeadAnims  = 0;

	handle = trap_PC_LoadSource(filename);

	if (!handle)
	{
		return qfalse;
	}

	if (!trap_PC_ReadToken(handle, &token) || Q_stricmp(token.string, "animgroup"))
	{
		return BG_RAG_ParseError(handle, "expected 'animgroup'");
	}

	if (!trap_PC_ReadToken(handle, &token) || Q_stricmp(token.string, "{"))
	{
		return BG_RAG_ParseError(handle, "expected '{'");
	}

	while (1)
	{
		if (!trap_PC_ReadToken(handle, &token))
		{
			break;
		}

		if (token.string[0] == '}')
		{
			break;
		}

		if (!Q_stricmp(token.string, "animfile"))
		{
			if (!BG_RAG_ParseAnimFile(handle, animModelInfo))
			{
				return qfalse;
			}
		}
		else
		{
			return BG_RAG_ParseError(handle, "unknown token '%s'", token.string);
		}
	}

	trap_PC_FreeSource(handle);

	return qtrue;
}
