/* Copyright (C) 2022 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include "MessageHandler.h"

#include "../CommandProc.h"

#include "graphics/LightEnv.h"
#include "graphics/Terrain.h"
#include "maths/MathUtil.h"
#include "ps/CStr.h"
#include "ps/Game.h"
#include "ps/World.h"
#include "renderer/PostprocManager.h"
#include "renderer/Renderer.h"
#include "renderer/SceneRenderer.h"
#include "renderer/SkyManager.h"
#include "renderer/WaterManager.h"
#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpWaterManager.h"

namespace AtlasMessage {

sEnvironmentSettings GetSettings()
{
	sEnvironmentSettings s;

	CmpPtr<ICmpWaterManager> cmpWaterManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpWaterManager);

	s.waterheight = cmpWaterManager->GetExactWaterLevel(0, 0) / (65536.f * HEIGHT_SCALE);

	const WaterManager& waterManager = g_Renderer.GetSceneRenderer().GetWaterManager();
	s.watertype = waterManager.m_WaterType;
	s.waterwaviness = waterManager.m_Waviness;
	s.watermurkiness = waterManager.m_Murkiness;
	s.windangle = waterManager.m_WindAngle;

	// CColor colors
#define COLOR(A, B) A = Color((int)(B.r*255), (int)(B.g*255), (int)(B.b*255))
	COLOR(s.watercolor, waterManager.m_WaterColor);
	COLOR(s.watertint, waterManager.m_WaterTint);
#undef COLOR

	float sunrotation = g_LightEnv.GetRotation();
	if (sunrotation > (float)M_PI)
		sunrotation -= (float)M_PI*2;
	s.sunrotation = sunrotation;
	s.sunelevation = g_LightEnv.GetElevation();

	s.posteffect = g_Renderer.GetPostprocManager().GetPostEffect();

	s.skyset = g_Renderer.GetSceneRenderer().GetSkyManager().GetSkySet();

	s.fogfactor = g_LightEnv.m_FogFactor;
	s.fogmax = g_LightEnv.m_FogMax;

	s.brightness = g_LightEnv.m_Brightness;
	s.contrast = g_LightEnv.m_Contrast;
	s.saturation = g_LightEnv.m_Saturation;
	s.bloom = g_LightEnv.m_Bloom;

	// RGBColor (CVector3D) colors
#define COLOR(A, B) A = Color((int)(B.X*255), (int)(B.Y*255), (int)(B.Z*255))
	s.sunoverbrightness = MaxComponent(g_LightEnv.m_SunColor);
	// clamp color to [0..1] before packing into u8 triplet
	if(s.sunoverbrightness > 1.0f)
		g_LightEnv.m_SunColor *= 1.0/s.sunoverbrightness;	// (there's no operator/=)
	// no component was above 1.0, so reset scale factor (don't want to darken)
	else
		s.sunoverbrightness = 1.0f;
	COLOR(s.suncolor, g_LightEnv.m_SunColor);
	COLOR(s.ambientcolor, g_LightEnv.m_AmbientColor);
	COLOR(s.fogcolor, g_LightEnv.m_FogColor);
#undef COLOR

	return s;
}

void SetSettings(const sEnvironmentSettings& s)
{
	CmpPtr<ICmpWaterManager> cmpWaterManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpWaterManager);

	cmpWaterManager->SetWaterLevel(entity_pos_t::FromFloat(s.waterheight * (65536.f * HEIGHT_SCALE)));

	WaterManager& waterManager = g_Renderer.GetSceneRenderer().GetWaterManager();
	waterManager.m_Waviness = s.waterwaviness;
	waterManager.m_Murkiness = s.watermurkiness;
	waterManager.m_WindAngle = s.windangle;
	if (waterManager.m_WaterType != *s.watertype)
	{
		waterManager.m_WaterType = *s.watertype;
		waterManager.ReloadWaterNormalTextures();
	}

#define COLOR(A, B) B = CColor(A->r/255.f, A->g/255.f, A->b/255.f, 1.f)
	COLOR(s.watercolor, waterManager.m_WaterColor);
	COLOR(s.watertint, waterManager.m_WaterTint);
#undef COLOR

	g_LightEnv.SetRotation(s.sunrotation);
	g_LightEnv.SetElevation(s.sunelevation);

	CStrW posteffect = *s.posteffect;
	if (posteffect.length() == 0)
		posteffect = L"default";
	g_Renderer.GetPostprocManager().SetPostEffect(posteffect);

	CStrW skySet = *s.skyset;
	if (skySet.length() == 0)
		skySet = L"default";
	g_Renderer.GetSceneRenderer().GetSkyManager().SetSkySet(skySet);

	g_LightEnv.m_FogFactor = s.fogfactor;
	g_LightEnv.m_FogMax = s.fogmax;

	g_LightEnv.m_Brightness = s.brightness;
	g_LightEnv.m_Contrast = s.contrast;
	g_LightEnv.m_Saturation = s.saturation;
	g_LightEnv.m_Bloom = s.bloom;

#define COLOR(A, B) B = RGBColor(A->r/255.f, A->g/255.f, A->b/255.f)
	COLOR(s.suncolor, g_LightEnv.m_SunColor);
	g_LightEnv.m_SunColor *= s.sunoverbrightness;
	COLOR(s.ambientcolor, g_LightEnv.m_AmbientColor);
	COLOR(s.fogcolor, g_LightEnv.m_FogColor);
#undef COLOR

	cmpWaterManager->RecomputeWaterData();
}

BEGIN_COMMAND(SetEnvironmentSettings)
{
	sEnvironmentSettings m_OldSettings, m_NewSettings;

	void Do()
	{
		m_OldSettings = GetSettings();
		m_NewSettings = msg->settings;
		Redo();
	}

	void Redo()
	{
		SetSettings(m_NewSettings);
	}

	void Undo()
	{
		SetSettings(m_OldSettings);
	}

	void MergeIntoPrevious(cSetEnvironmentSettings* prev)
	{
		prev->m_NewSettings = m_NewSettings;
	}
};
END_COMMAND(SetEnvironmentSettings)

BEGIN_COMMAND(RecalculateWaterData)
{
	void Do()
	{
		Redo();
	}

	void Redo()
	{
		CmpPtr<ICmpWaterManager> cmpWaterManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
		ENSURE(cmpWaterManager);

		cmpWaterManager->RecomputeWaterData();
	}

	void Undo()
	{
		Redo();
	}

};
END_COMMAND(RecalculateWaterData)

BEGIN_COMMAND(PickWaterHeight)
{
	entity_pos_t m_OldWaterHeight, m_NewWaterHeight;

	void Do()
	{
		CmpPtr<ICmpWaterManager> cmpWaterManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
		ENSURE(cmpWaterManager);

		CVector3D worldPos = msg->screenPos->GetWorldSpace();
		m_OldWaterHeight = cmpWaterManager->GetWaterLevel(
			entity_pos_t::FromFloat(worldPos.X), entity_pos_t::FromFloat(worldPos.Z));
		m_NewWaterHeight = entity_pos_t::FromFloat(worldPos.Y);
		SetWaterHeight(m_NewWaterHeight);
	}

	void Redo()
	{
		SetWaterHeight(m_NewWaterHeight);
	}

	void Undo()
	{
		SetWaterHeight(m_OldWaterHeight);
	}

	void SetWaterHeight(entity_pos_t height)
	{
		CmpPtr<ICmpWaterManager> cmpWaterManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
		ENSURE(cmpWaterManager);

		cmpWaterManager->SetWaterLevel(height);
		cmpWaterManager->RecomputeWaterData();
	}
};
END_COMMAND(PickWaterHeight)


QUERYHANDLER(GetEnvironmentSettings)
{
	msg->settings = GetSettings();
}

QUERYHANDLER(GetSkySets)
{
	std::vector<CStrW> skies = g_Renderer.GetSceneRenderer().GetSkyManager().GetSkySets();
	msg->skysets = std::vector<std::wstring>(skies.begin(), skies.end());
}


QUERYHANDLER(GetPostEffects)
{
	std::vector<CStrW> effects = g_Renderer.GetPostprocManager().GetPostEffects();
	msg->posteffects = std::vector<std::wstring>(effects.begin(), effects.end());
}

}