//
// Copyright (c) 2008-2013 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "Application.h"
#include "Console.h"
#include "DebugHud.h"
#include "Engine.h"
#include "InputEvents.h"
#include "Renderer.h"
#include "ResourceCache.h"
#include "Sprite.h"
#include "Texture2D.h"
#include "UI.h"
#include "XMLFile.h"

Sample::Sample(Context* context) :
    Application(context)
{
}

void Sample::Setup()
{
    // Modify engine startup parameters
    engineParameters_["WindowTitle"] = GetTypeName();
    engineParameters_["LogName"]     = GetTypeName() + ".log";
    engineParameters_["FullScreen"]  = false;
    engineParameters_["Headless"]    = false;
}

void Sample::Start()
{
    // Create logo
    CreateLogo();

    // Create console and debug HUD
    CreateConsoleAndDebugHud();

    // Subscribe key down event
    SubscribeToEvent(E_KEYDOWN, HANDLER(Sample, HandleKeyDown));
}

void Sample::SetLogoVisible(bool enable)
{
    if (logoSprite_)
        logoSprite_->SetVisible(enable);
}

void Sample::CreateLogo()
{
    // Get logo texture
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    Texture2D* logoTexture = cache->GetResource<Texture2D>("Textures/LogoLarge.png");
    if (!logoTexture)
        return;

    // Create logo sprite and add to the UI layout
    UI* ui = GetSubsystem<UI>();
    logoSprite_ = ui->GetRoot()->CreateChild<Sprite>();

    // Set logo sprite texture
    logoSprite_->SetTexture(logoTexture);

    int textureWidth = logoTexture->GetWidth();
    int textureHeight = logoTexture->GetHeight();

    // Set logo sprite scale
    logoSprite_->SetScale(256.0f / textureWidth);

    // Set logo sprite size
    logoSprite_->SetSize(textureWidth, textureHeight);

    // Set logo sprite hot spot
    logoSprite_->SetHotSpot(0, textureHeight);

    // Set logo sprite alignment
    logoSprite_->SetAlignment(HA_LEFT, VA_BOTTOM);
    
    // Make logo not fully opaque to show the scene underneath
    logoSprite_->SetOpacity(0.75f);
    
    // Set a low priority for the logo so that other UI elements can be drawn on top
    logoSprite_->SetPriority(-100);
}

void Sample::CreateConsoleAndDebugHud()
{
    // Get default style
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    XMLFile* xmlFile = cache->GetResource<XMLFile>("UI/DefaultStyle.xml");

    // Create console
    Console* console = engine_->CreateConsole();
    console->SetDefaultStyle(xmlFile);

    // Create debug HUD.
    DebugHud* debugHud = engine_->CreateDebugHud();
    debugHud->SetDefaultStyle(xmlFile);
}

void Sample::HandleKeyDown(StringHash eventType, VariantMap& eventData)
{
    using namespace KeyDown;

    int key = eventData[P_KEY].GetInt();

    // Close console (if open) or exit when ESC is pressed
    if (key == KEY_ESC)
    {
        Console* console = GetSubsystem<Console>();
        if (!console->IsVisible())
            engine_->Exit();
        else
            console->SetVisible(false);
    }

    // Toggle console with F1
    else if (key == KEY_F1)
        GetSubsystem<Console>()->Toggle();
    
    // Toggle debug HUD with F2
    else if (key == KEY_F2)
        GetSubsystem<DebugHud>()->ToggleAll();
    
    // Common rendering quality controls, only when UI has no focused element
    else if (!GetSubsystem<UI>()->GetFocusElement())
    {
        Renderer* renderer = GetSubsystem<Renderer>();
        
        // Texture quality
        if (key == '1')
        {
            int quality = renderer->GetTextureQuality();
            ++quality;
            if (quality > QUALITY_HIGH)
                quality = QUALITY_LOW;
            renderer->SetTextureQuality(quality);
        }
        
        // Material quality
        else if (key == '2')
        {
            int quality = renderer->GetMaterialQuality();
            ++quality;
            if (quality > QUALITY_HIGH)
                quality = QUALITY_LOW;
            renderer->SetMaterialQuality(quality);
        }
        
        // Specular lighting
        else if (key == '3')
            renderer->SetSpecularLighting(!renderer->GetSpecularLighting());
        
        // Shadow rendering
        else if (key == '4')
            renderer->SetDrawShadows(!renderer->GetDrawShadows());
        
        // Shadow map resolution
        else if (key == '5')
        {
            int shadowMapSize = renderer->GetShadowMapSize();
            shadowMapSize *= 2;
            if (shadowMapSize > 2048)
                shadowMapSize = 512;
            renderer->SetShadowMapSize(shadowMapSize);
        }
        
        // Shadow depth and filtering quality
        else if (key == '6')
        {
            int quality = renderer->GetShadowQuality();
            ++quality;
            if (quality > SHADOWQUALITY_HIGH_24BIT)
                quality = SHADOWQUALITY_LOW_16BIT;
            renderer->SetShadowQuality(quality);
        }
        
        // Occlusion culling
        else if (key == '7')
        {
            bool occlusion = renderer->GetMaxOccluderTriangles() > 0;
            occlusion = !occlusion;
            renderer->SetMaxOccluderTriangles(occlusion ? 5000 : 0);
        }
        
        // Instancing
        else if (key == '8')
            renderer->SetDynamicInstancing(!renderer->GetDynamicInstancing());
    }
}