/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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/>.
 *
 */

#include "common/config-manager.h"
#include "ags/engine/ac/math.h"
#include "ags/shared/ac/common.h" // quit
#include "ags/shared/util/math.h"
#include "ags/shared/debugging/out.h"
#include "ags/engine/script/script_api.h"
#include "ags/engine/script/script_runtime.h"
#include "ags/ags.h"
#include "ags/globals.h"

namespace AGS3 {

int FloatToInt(float value, int roundDirection) {
	if (value >= 0.0) {
		if (roundDirection == eRoundDown)
			return static_cast<int>(value);
		else if (roundDirection == eRoundNearest)
			return static_cast<int>(value + 0.5);
		else if (roundDirection == eRoundUp)
			return static_cast<int>(value + 0.999999);
		else
			error("!FloatToInt: invalid round direction");
	} else {
		// negative number
		if (roundDirection == eRoundUp)
			return static_cast<int>(value); // this just truncates
		else if (roundDirection == eRoundNearest)
			return static_cast<int>(value - 0.5);
		else if (roundDirection == eRoundDown)
			return static_cast<int>(value - 0.999999);
		else
			error("!FloatToInt: invalid round direction");
	}
	return 0;
}

float IntToFloat(int value) {
	return static_cast<float>(value);
}

float StringToFloat(const char *theString) {
	return static_cast<float>(atof(theString));
}

float Math_Cos(float value) {
	return cos(value);
}

float Math_Sin(float value) {
	return sin(value);
}

float Math_Tan(float value) {
	return tan(value);
}

float Math_ArcCos(float value) {
	return acos(value);
}

float Math_ArcSin(float value) {
	return asin(value);
}

float Math_ArcTan(float value) {
	return atan(value);
}

float Math_ArcTan2(float yval, float xval) {
	return atan2(yval, xval);
}

float Math_Log(float value) {
	return log(value);
}

float Math_Log10(float value) {
	return ::log10(value);
}

float Math_Exp(float value) {
	return exp(value);
}

float Math_Cosh(float value) {
	return cosh(value);
}

float Math_Sinh(float value) {
	return sinh(value);
}

float Math_Tanh(float value) {
	return tanh(value);
}

float Math_RaiseToPower(float base, float exp) {
	return ::pow(base, exp);
}

float Math_DegreesToRadians(float value) {
	return static_cast<float>(value * (M_PI / 180.0));
}

float Math_RadiansToDegrees(float value) {
	return static_cast<float>(value * (180.0 / M_PI));
}

float Math_GetPi() {
	return static_cast<float>(M_PI);
}

float Math_Sqrt(float value) {
	if (value < 0.0)
		error("!Sqrt: cannot perform square root of negative number");

	return ::sqrt(value);
}

int __Rand(int upto) {
	// WORKAROUND: Fix crash in Captain Disaster in Death Has a Million Stomping Boots
	// at the start of Act 2, walking to Aquarium
	if (upto == -1 && ConfMan.get("gameid") == "captaindisaster")
		upto = INT32_MAX;

	if (upto < 0)
		error("!Random: invalid parameter passed -- must be at least 0.");

	return ::AGS::g_vm->getRandomNumber(upto);
}


//=============================================================================
//
// Script API Functions
//
//=============================================================================

// float (float value)
RuntimeScriptValue Sc_Math_ArcCos(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_ArcCos);
}

// float (float value)
RuntimeScriptValue Sc_Math_ArcSin(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_ArcSin);
}

// float (float value)
RuntimeScriptValue Sc_Math_ArcTan(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_ArcTan);
}

// float (SCRIPT_FLOAT(yval), SCRIPT_FLOAT(xval))
RuntimeScriptValue Sc_Math_ArcTan2(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT2(Math_ArcTan2);
}

// float (float value)
RuntimeScriptValue Sc_Math_Cos(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Cos);
}

// float (float value)
RuntimeScriptValue Sc_Math_Cosh(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Cosh);
}

// float (float value)
RuntimeScriptValue Sc_Math_DegreesToRadians(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_DegreesToRadians);
}

// float (float value)
RuntimeScriptValue Sc_Math_Exp(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Exp);
}

// float (float value)
RuntimeScriptValue Sc_Math_Log(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Log);
}

// float (float value)
RuntimeScriptValue Sc_Math_Log10(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Log10);
}

// float (float value)
RuntimeScriptValue Sc_Math_RadiansToDegrees(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_RadiansToDegrees);
}

// float (SCRIPT_FLOAT(base), SCRIPT_FLOAT(exp))
RuntimeScriptValue Sc_Math_RaiseToPower(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT2(Math_RaiseToPower);
}

// float (float value)
RuntimeScriptValue Sc_Math_Sin(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Sin);
}

// float (float value)
RuntimeScriptValue Sc_Math_Sinh(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Sinh);
}

// float (float value)
RuntimeScriptValue Sc_Math_Sqrt(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Sqrt);
}

// float (float value)
RuntimeScriptValue Sc_Math_Tan(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Tan);
}

// float (float value)
RuntimeScriptValue Sc_Math_Tanh(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT_PFLOAT(Math_Tanh);
}

// float ()
RuntimeScriptValue Sc_Math_GetPi(const RuntimeScriptValue *params, int32_t param_count) {
	API_SCALL_FLOAT(Math_GetPi);
}


void RegisterMathAPI() {
	ccAddExternalStaticFunction("Maths::ArcCos^1", Sc_Math_ArcCos);
	ccAddExternalStaticFunction("Maths::ArcSin^1", Sc_Math_ArcSin);
	ccAddExternalStaticFunction("Maths::ArcTan^1", Sc_Math_ArcTan);
	ccAddExternalStaticFunction("Maths::ArcTan2^2", Sc_Math_ArcTan2);
	ccAddExternalStaticFunction("Maths::Cos^1", Sc_Math_Cos);
	ccAddExternalStaticFunction("Maths::Cosh^1", Sc_Math_Cosh);
	ccAddExternalStaticFunction("Maths::DegreesToRadians^1", Sc_Math_DegreesToRadians);
	ccAddExternalStaticFunction("Maths::Exp^1", Sc_Math_Exp);
	ccAddExternalStaticFunction("Maths::Log^1", Sc_Math_Log);
	ccAddExternalStaticFunction("Maths::Log10^1", Sc_Math_Log10);
	ccAddExternalStaticFunction("Maths::RadiansToDegrees^1", Sc_Math_RadiansToDegrees);
	ccAddExternalStaticFunction("Maths::RaiseToPower^2", Sc_Math_RaiseToPower);
	ccAddExternalStaticFunction("Maths::Sin^1", Sc_Math_Sin);
	ccAddExternalStaticFunction("Maths::Sinh^1", Sc_Math_Sinh);
	ccAddExternalStaticFunction("Maths::Sqrt^1", Sc_Math_Sqrt);
	ccAddExternalStaticFunction("Maths::Tan^1", Sc_Math_Tan);
	ccAddExternalStaticFunction("Maths::Tanh^1", Sc_Math_Tanh);
	ccAddExternalStaticFunction("Maths::get_Pi", Sc_Math_GetPi);
}

} // namespace AGS3