/*
  orxonox - the future of 3D-vertical-scrollers

  Copyright (C) 2004 orx

  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, or (at your option)
  any later version.

### File Specific:
  main-programmer: hdavid, amaechler

  INSPIRED BY http://www.codesampler.com/usersrc/usersrc_6.htm#oglu_sky_dome_shader
*/

#include "cloud_effect.h"

#include "util/loading/load_param.h"
#include "util/loading/factory.h"
#include "util/loading/resource_manager.h"

#include "material.h"
#include "state.h"
#include "p_node.h"
#include "shader.h"
#include "shell_command.h"
#include "t_animation.h"
#include "script_class.h"

#include "parser/tinyxml/tinyxml.h"

Vector    CloudEffect::cloudColor;
Vector    CloudEffect::skyColor;
Vector    CloudEffect::newCloudColor;
Vector    CloudEffect::newSkyColor;

bool      CloudEffect::fadeSky;
bool      CloudEffect::fadeCloud;
float     CloudEffect::fadeTime;



SHELL_COMMAND(activate, CloudEffect, activateCloud);
SHELL_COMMAND(deactivate, CloudEffect, deactivateCloud);
SHELL_COMMAND(skyColor, CloudEffect, shellSkyColor);
SHELL_COMMAND(cloudColor, CloudEffect, shellCloudColor);


CREATE_SCRIPTABLE_CLASS(CloudEffect, CL_CLOUD_EFFECT,
                        addMethod("skyColor", ExecutorLua4<CloudEffect,float,float,float,float>(&CloudEffect::shellSkyColor))
                        ->addMethod("cloudColor", ExecutorLua4<CloudEffect,float,float,float,float>(&CloudEffect::shellCloudColor))
                        ->addMethod("activate", ExecutorLua0<CloudEffect>(&CloudEffect::activate))
                        ->addMethod("deactivate", ExecutorLua0<CloudEffect>(&CloudEffect::deactivate))
                       );


CREATE_FACTORY(CloudEffect, CL_CLOUD_EFFECT);

CloudEffect::CloudEffect(const TiXmlElement* root) {
    this->setClassID(CL_CLOUD_EFFECT, "CloudEffect");

    this->init();

    if (root != NULL)
        this->loadParams(root);

    if(cloudActivate)
        this->activate();
}

CloudEffect::~CloudEffect() {
    this->deactivate();

    if (glIsTexture(noise3DTexName))
        glDeleteTextures(1, &noise3DTexName);

    delete shader;
}


void CloudEffect::init() {
    PRINTF(0)("Initializing CloudEffect\n");

    // default values
    this->offsetZ = 0;
    this->animationSpeed = 2;
    this->scale = 0.0004f;
    this->atmosphericRadius = 4000;
    this->planetRadius = 1500;
    this->divs = 15;
    this->cloudActivate = false;
    fadeSky = false;
    fadeCloud = false;


    skyColor = Vector(0.0f, 0.0f, 0.8f);
    cloudColor = Vector(0.8f, 0.8f, 0.8f);
    newSkyColor = skyColor;
    newCloudColor = cloudColor;

    this->noise3DTexSize = 128;
    this->noise3DTexName = 0;

    this->make3DNoiseTexture();

    glGenTextures(1, &noise3DTexName);
    glBindTexture(GL_TEXTURE_3D, noise3DTexName);

    glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA,
                 noise3DTexSize, noise3DTexSize, noise3DTexSize,
                 0, GL_RGBA, GL_UNSIGNED_BYTE, noise3DTexPtr);

    this->skydome = new Skydome();
    this->skydome->setTexture(noise3DTexName);

    this->shader = new Shader(ResourceManager::getInstance()->getDataDir() + "/shaders/cloud.vert",
                              ResourceManager::getInstance()->getDataDir() + "/shaders/cloud.frag");

    this->shader->activateShader();

    Shader::Uniform(shader, "Noise").set(0);

    this->offset = new Shader::Uniform(shader, "Offset");
    this->skycolor = new Shader::Uniform(shader, "SkyColor");
    this->cloudcolor = new Shader::Uniform(shader, "CloudColor");

    this->shader->deactivateShader();

    this->skydome->setShader(shader);
}


void CloudEffect::loadParams(const TiXmlElement* root) {
    WeatherEffect::loadParams(root);

    LoadParam(root, "speed", this, CloudEffect, setAnimationSpeed);
    LoadParam(root, "scale", this, CloudEffect, setCloudScale);
    LoadParam(root, "cloudcolor", this, CloudEffect, setCloudColor);
    LoadParam(root, "skycolor", this, CloudEffect, setSkyColor);

    LoadParam(root, "planetRadius", this, CloudEffect, setPlanetRadius);
    LoadParam(root, "atmosphericRadius", this, CloudEffect, setAtmosphericRadius);
    LoadParam(root, "divisions", this, CloudEffect, setDivisions);

    LOAD_PARAM_START_CYCLE(root, element);
    {
        LoadParam_CYCLE(element, "option", this, CloudEffect, setCloudOption);
    }
    LOAD_PARAM_END_CYCLE(element);
}


void CloudEffect::activate() {
    PRINTF(0)( "Activating\n");

    // Can only be set after the loadParams call
    this->shader->activateShader();
    Shader::Uniform(shader, "Scale").set(this->scale);
    this->skycolor->set
    (skyColor.x, skyColor.y, skyColor.z);
    this->cloudcolor->set
    (cloudColor.x, cloudColor.y, cloudColor.z);
    this->shader->deactivateShader();

    this->skydome->generateSkyPlane(this->divs, this->planetRadius, this->atmosphericRadius, 1, 1);
    this->skydome->activate();

    this->cloudActivate = true;
}

void CloudEffect::deactivate() {
    PRINTF(0)("Deactivating CloudEffect\n");

    this->skydome->deactivate();
    this->cloudActivate = false;
}

void CloudEffect::draw() const {}

void CloudEffect::tick (float dt) {

    if (this->cloudActivate) {

        this->offsetZ += 0.05 * dt * this->animationSpeed;

        this->shader->activateShader();
        this->offset->set
        (0.0f, 0.0f, offsetZ);

        if(cloudColor != newCloudColor) {

            if(fadeCloud) {

                this->cloudColorFadeX = new tAnimation<CloudEffect>(this, &CloudEffect::setColorCloudX);
                this->cloudColorFadeX->setInfinity(ANIM_INF_CONSTANT);
                this->cloudColorFadeY = new tAnimation<CloudEffect>(this, &CloudEffect::setColorCloudY);
                this->cloudColorFadeY->setInfinity(ANIM_INF_CONSTANT);
                this->cloudColorFadeZ = new tAnimation<CloudEffect>(this, &CloudEffect::setColorCloudZ);
                this->cloudColorFadeZ->setInfinity(ANIM_INF_CONSTANT);

                this->cloudColorFadeX->addKeyFrame(cloudColor.x, fadeTime, ANIM_LINEAR);
                this->cloudColorFadeX->addKeyFrame(newCloudColor.x, 0, ANIM_LINEAR);

                this->cloudColorFadeY->addKeyFrame(cloudColor.y, fadeTime, ANIM_LINEAR);
                this->cloudColorFadeY->addKeyFrame(newCloudColor.y, 0, ANIM_LINEAR);

                this->cloudColorFadeZ->addKeyFrame(cloudColor.z, fadeTime, ANIM_LINEAR);
                this->cloudColorFadeZ->addKeyFrame(newCloudColor.z, 0, ANIM_LINEAR);

                fadeCloud = false;

                this->cloudColorFadeX->replay();
                this->cloudColorFadeY->replay();
                this->cloudColorFadeZ->replay();
            }

            this->cloudcolor->set
            (this->cloudColor.x, this->cloudColor.y, this->cloudColor.z);
        }

        if(skyColor != newSkyColor) {

            if(fadeSky) {

                this->skyColorFadeX = new tAnimation<CloudEffect>(this, &CloudEffect::setColorSkyX);
                this->skyColorFadeX->setInfinity(ANIM_INF_CONSTANT);
                this->skyColorFadeY = new tAnimation<CloudEffect>(this, &CloudEffect::setColorSkyY);
                this->skyColorFadeY->setInfinity(ANIM_INF_CONSTANT);
                this->skyColorFadeZ = new tAnimation<CloudEffect>(this, &CloudEffect::setColorSkyZ);
                this->skyColorFadeZ->setInfinity(ANIM_INF_CONSTANT);

                this->skyColorFadeX->addKeyFrame(skyColor.x, fadeTime, ANIM_LINEAR);
                this->skyColorFadeX->addKeyFrame(newSkyColor.x, 0, ANIM_LINEAR);

                this->skyColorFadeY->addKeyFrame(skyColor.y, fadeTime, ANIM_LINEAR);
                this->skyColorFadeY->addKeyFrame(newSkyColor.y, 0, ANIM_LINEAR);

                this->skyColorFadeZ->addKeyFrame(skyColor.z, fadeTime, ANIM_LINEAR);
                this->skyColorFadeZ->addKeyFrame(newSkyColor.z, 0, ANIM_LINEAR);

                fadeSky = false;

                this->skyColorFadeX->replay();
                this->skyColorFadeY->replay();
                this->skyColorFadeZ->replay();
            }

            this->skycolor->set
            (this->skyColor.x, this->skyColor.y, this->skyColor.z);
        }

        this->shader->deactivateShader();
    }
}


void CloudEffect::setColorSkyX(float color) {
    skyColor.x = color;
}
void CloudEffect::setColorSkyY(float color) {
    skyColor.y = color;
}
void CloudEffect::setColorSkyZ(float color) {
    skyColor.z = color;
}
void CloudEffect::setColorCloudX(float color) {
    cloudColor.x = color;
}
void CloudEffect::setColorCloudY(float color) {
    cloudColor.y = color;
}
void CloudEffect::setColorCloudZ(float color) {
    cloudColor.z = color;
}

void CloudEffect::changeSkyColor(Vector color, float time) {
    newSkyColor = color;
    fadeSky = true;
    fadeTime = time;
}


void CloudEffect::changeCloudColor(Vector color, float time) {
    newCloudColor = color;
    fadeCloud = true;
    fadeTime = time;
}

void CloudEffect::shellSkyColor(float colorX, float colorY, float colorZ, float time) {
    changeSkyColor( Vector(colorX, colorY, colorZ), time);
}

void CloudEffect::shellCloudColor(float colorX, float colorY, float colorZ, float time) {
    changeCloudColor( Vector(colorX, colorY, colorZ), time);
}



void CloudEffect::make3DNoiseTexture() {
    int f, i, j, k, inc;
    int startFrequency = 4;
    int numOctaves = 4;
    double ni[3];
    double inci, incj, inck;
    int frequency = startFrequency;
    GLubyte *ptr;
    double amp = 0.5;

    if ((noise3DTexPtr = (GLubyte *) malloc(noise3DTexSize *
                                            noise3DTexSize *
                                            noise3DTexSize * 4)) == NULL)
        PRINTF(0)("ERROR: Could not allocate 3D noise texture\n");

    for (f=0, inc=0; f < numOctaves;
            ++f, frequency *= 2, ++inc, amp *= 0.5) {
        SetNoiseFrequency(frequency);
        ptr = noise3DTexPtr;
        ni[0] = ni[1] = ni[2] = 0;

        inci = 1.0 / (noise3DTexSize / frequency);
        for (i=0; i<noise3DTexSize; ++i, ni[0] += inci) {
            incj = 1.0 / (noise3DTexSize / frequency);
            for (j=0; j<noise3DTexSize; ++j, ni[1] += incj) {
                inck = 1.0 / (noise3DTexSize / frequency);
                for (k=0; k<noise3DTexSize; ++k, ni[2] += inck, ptr+= 4) {
                    *(ptr+inc) = (GLubyte) (((noise3(ni)+1.0) * amp)*128.0);
                }
            }
        }
    }
}

void CloudEffect::initNoise() {
    int i, j, k;

    srand(30757);
    for (i = 0 ; i < B ; i++) {
        p[i] = i;
        g1[i] = (double)((rand() % (B + B)) - B) / B;

        for (j = 0 ; j < 2 ; j++)
            g2[i][j] = (double)((rand() % (B + B)) - B) / B;
        normalize2(g2[i]);

        for (j = 0 ; j < 3 ; j++)
            g3[i][j] = (double)((rand() % (B + B)) - B) / B;
        normalize3(g3[i]);
    }

    while (--i) {
        k = p[i];
        p[i] = p[j = rand() % B];
        p[j] = k;
    }

    for (i = 0 ; i < B + 2 ; i++) {
        p[B + i] = p[i];
        g1[B + i] = g1[i];
        for (j = 0 ; j < 2 ; j++)
            g2[B + i][j] = g2[i][j];
        for (j = 0 ; j < 3 ; j++)
            g3[B + i][j] = g3[i][j];
    }
}

void CloudEffect::SetNoiseFrequency( int frequency) {
    start = 1;
    B = frequency;
    BM = B-1;
}

double CloudEffect::noise3( double vec[3]) {
    int bx0, bx1, by0, by1, bz0, bz1, b00, b10, b01, b11;
    double rx0, rx1, ry0, ry1, rz0, rz1, *q, sy, sz, a, b, c, d, t, u, v;
    int i, j;

    if (start) {
        start = 0;
        initNoise();
    }

    setup(0, bx0,bx1, rx0,rx1);
    setup(1, by0,by1, ry0,ry1);
    setup(2, bz0,bz1, rz0,rz1);

    i = p[ bx0 ];
    j = p[ bx1 ];

    b00 = p[ i + by0 ];
    b10 = p[ j + by0 ];
    b01 = p[ i + by1 ];
    b11 = p[ j + by1 ];

    t  = s_curve(rx0);
    sy = s_curve(ry0);
    sz = s_curve(rz0);

    q = g3[ b00 + bz0 ] ;
    u = at3(rx0,ry0,rz0);
    q = g3[ b10 + bz0 ] ;
    v = at3(rx1,ry0,rz0);
    a = lerp(t, u, v);

    q = g3[ b01 + bz0 ] ;
    u = at3(rx0,ry1,rz0);
    q = g3[ b11 + bz0 ] ;
    v = at3(rx1,ry1,rz0);
    b = lerp(t, u, v);

    c = lerp(sy, a, b);

    q = g3[ b00 + bz1 ] ;
    u = at3(rx0,ry0,rz1);
    q = g3[ b10 + bz1 ] ;
    v = at3(rx1,ry0,rz1);
    a = lerp(t, u, v);

    q = g3[ b01 + bz1 ] ;
    u = at3(rx0,ry1,rz1);
    q = g3[ b11 + bz1 ] ;
    v = at3(rx1,ry1,rz1);
    b = lerp(t, u, v);

    d = lerp(sy, a, b);

    return lerp(sz, c, d);
}

void CloudEffect::normalize2( double v[2]) {
    double s;

    s = sqrt(v[0] * v[0] + v[1] * v[1]);
    v[0] = v[0] / s;
    v[1] = v[1] / s;
}

void CloudEffect::normalize3( double v[3]) {
    double s;

    s = sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
    v[0] = v[0] / s;
    v[1] = v[1] / s;
    v[2] = v[2] / s;
}