/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    Stars.exe
    FILE:         TerrainRegion.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Various Heavenly Bodies
*/

#include "MemDebug.h"
#include "TerrainRegion.h"
#include "Sky.h"
#include "TerrainHaze.h"
#include "TerrainLayer.h"
#include "Sim.h"
#include "Grid.h"
#include "CameraDirector.h"
#include "HUDView.h"

#include "Game.h"
#include "Sound.h"
#include "Solid.h"
#include "Sprite.h"
#include "Light.h"
#include "Bitmap.h"
#include "DataLoader.h"
#include "Scene.h"
#include "ParseUtil.h"

// +====================================================================+

TerrainRegion::TerrainRegion(StarSystem* s, const char* n, double r, Orbital* p)
: OrbitalRegion(s, n, 0.0, r, 0.0, p),
scale(10e3),
mtnscale(1e3),
fog_density(0),
fog_scale(0),
day_phase(0),
eclipsed(false)
{
    type = TERRAIN;

    if (primary) {
        orbit  = primary->Radius();
        period = primary->Rotation();
    }

    clouds_alt_high = 12.0e3;
    clouds_alt_low  =  8.0e3;

    Update();
}

// +--------------------------------------------------------------------+

TerrainRegion::~TerrainRegion()
{
    layers.destroy();
}

// +--------------------------------------------------------------------+

void
TerrainRegion::Update()
{
    if (system && primary) {
        phase = primary->RotationPhase();
        loc   = primary->Location() + Point((double) (orbit * cos(phase)),
        (double) (orbit * sin(phase)),
        0);
    }

    if (rep)
    rep->MoveTo(loc.OtherHand());

    // calc day phase:
    OrbitalBody* star = system->Bodies()[0];

    Point tvpn = Location() - primary->Location();
    Point tvst = star->Location() - primary->Location();

    tvpn.Normalize();
    tvst.Normalize();

    day_phase = acos(tvpn * tvst) + PI;

    Point meridian = tvpn.cross(tvst);

    if (meridian.z < 0) {
        day_phase = 2*PI - day_phase;
    }

    day_phase *= 24 / (2*PI);

    if (!system || system->ActiveRegion() != this)
    return;

    // set sky color:
    int    base_hour = (int) day_phase;
    double fraction  = day_phase - base_hour;

    sky_color[24]   = Color::Scale(sky_color[base_hour],   sky_color[base_hour+1],   fraction);
    sun_color[24]   = Color::Scale(sun_color[base_hour],   sun_color[base_hour+1],   fraction);
    fog_color[24]   = Color::Scale(fog_color[base_hour],   fog_color[base_hour+1],   fraction);
    ambient[24]     = Color::Scale(ambient[base_hour],     ambient[base_hour+1],     fraction);
    overcast[24]    = Color::Scale(overcast[base_hour],    overcast[base_hour+1],    fraction);
    cloud_color[24] = Color::Scale(cloud_color[base_hour], cloud_color[base_hour+1], fraction);
    shade_color[24] = Color::Scale(shade_color[base_hour], shade_color[base_hour+1], fraction);

    CameraDirector*   cam_dir = CameraDirector::GetInstance();
    Sim*              sim    = Sim::GetSim();
    double            alt    = 0;
    double            dim    = 1;

    if (cam_dir && cam_dir->GetCamera())
    alt = cam_dir->GetCamera()->Pos().y;

    if (alt > 0) {
        if (alt < TERRAIN_ALTITUDE_LIMIT) {
            if (weather.Ceiling() > 0) {
                fog_color[24] = overcast[24];
                sky_color[24] = overcast[24];
                dim = 0.125;

                /***
            if (alt < weather.Ceiling()) {
            sky_color[24] = overcast[24];
            dim = 0.125;
            }
            else if (alt < weather.Ceiling() + 500) {
            double thick = (weather.Ceiling() + 500.0 - alt) / 500.0;
            sky_color[24] =  sky_color[24] * (1.0 - thick);
            sky_color[24] += overcast[24] * thick;

            dim = 1 - thick * 0.875;
            }
            else {
            sky_color[24] = sky_color[24] * (1 - alt/TERRAIN_ALTITUDE_LIMIT);
            }
            ***/
            }

            else {
                sky_color[24] = sky_color[24] * (1 - alt/TERRAIN_ALTITUDE_LIMIT);
            }
        }
        else {
            sky_color[24] = Color::Black;
        }
    }

    if (system) {
        system->SetSunlight(sun_color[24], dim);
        system->SetBacklight(sky_color[24], dim);

        HUDView* hud = HUDView::GetInstance();
        if (hud) {
            Color night_vision = hud->Ambient();
            sky_color[24] += night_vision * 0.15;
        }
    }
}

// +--------------------------------------------------------------------+

void
TerrainRegion::LoadSkyColors(const char* bmp_name)
{
    Bitmap sky_colors_bmp;

    DataLoader* loader = DataLoader::GetLoader();
    loader->LoadBitmap(bmp_name, sky_colors_bmp);

    int max_color = sky_colors_bmp.Width();

    if (max_color > 24)
    max_color = 24;

    for (int i = 0; i < 25; i++) {
        sun_color[i]   = Color::White;
        sky_color[i]   = Color::Black;
        fog_color[i]   = Color::White;
        ambient[i]     = Color::DarkGray;
        cloud_color[i] = Color::White;
        shade_color[i] = Color::Gray;
    }

    for (int i = 0; i < max_color; i++)
    sky_color[i] = sky_colors_bmp.GetColor(i, 0);

    if (sky_colors_bmp.Height() > 1)
    for (int i = 0; i < max_color; i++)
    fog_color[i].Set(sky_colors_bmp.GetColor(i, 1).Value() | Color(0,0,0,255).Value());

    if (sky_colors_bmp.Height() > 2)
    for (int i = 0; i < max_color; i++)
    ambient[i] = sky_colors_bmp.GetColor(i, 2);

    if (sky_colors_bmp.Height() > 3)
    for (int i = 0; i < max_color; i++)
    sun_color[i] = sky_colors_bmp.GetColor(i, 3);

    if (sky_colors_bmp.Height() > 4)
    for (int i = 0; i < max_color; i++)
    overcast[i] = sky_colors_bmp.GetColor(i, 4);

    if (sky_colors_bmp.Height() > 5)
    for (int i = 0; i < max_color; i++)
    cloud_color[i] = sky_colors_bmp.GetColor(i, 5);

    if (sky_colors_bmp.Height() > 6)
    for (int i = 0; i < max_color; i++)
    shade_color[i] = sky_colors_bmp.GetColor(i, 6);
}

// +--------------------------------------------------------------------+

void
TerrainRegion::AddLayer(double h, const char* tile, const char* detail)
{
    TerrainLayer* layer = new(__FILE__,__LINE__) TerrainLayer;

    layer->min_height = h;
    layer->tile_name  = tile;

    if (detail && *detail)
    layer->detail_name = detail;

    layers.append(layer);
}

const Text&
TerrainRegion::EnvironmentTexture(int face) const
{
    switch (face) {
    case 0:  return env_texture_positive_x;

    case 1:  if (env_texture_negative_x.length() > 0)
        return env_texture_negative_x;
        return env_texture_positive_x;

    case 2:  return env_texture_positive_y;

    case 3:  if (env_texture_negative_y.length() > 0)
        return env_texture_negative_y;
        return env_texture_positive_y;

    case 4:  if (env_texture_positive_z.length() > 0)
        return env_texture_positive_z;
        return env_texture_positive_x;

    case 5:  if (env_texture_negative_z.length() > 0)
        return env_texture_negative_z;
        if (env_texture_positive_z.length() > 0)
        return env_texture_positive_z;
        return env_texture_positive_x;
    }

    return env_texture_positive_x;
}