#pragma once
#include<hgl/platform/Window.h>
#include<hgl/graph/VKInstance.h>
#include<hgl/graph/VKPhysicalDevice.h>
#include<hgl/graph/VKDevice.h>
#include<hgl/graph/VKSemaphore.h>
#include<hgl/graph/VKBuffer.h>
#include<hgl/graph/VKShaderModule.h>
#include<hgl/graph/VKImageView.h>
#include<hgl/graph/VKPrimitive.h>
#include<hgl/graph/VKDescriptorSet.h>
#include<hgl/graph/VKRenderPass.h>
#include<hgl/graph/VKPipeline.h>
#include<hgl/graph/VKCommandBuffer.h>
#include<hgl/graph/VKFormat.h>
#include<hgl/graph/VKFramebuffer.h>
#include<hgl/graph/VKMaterial.h>
#include<hgl/graph/VKMaterialParameters.h>
#include<hgl/graph/VKMaterialInstance.h>
#include<hgl/graph/VKRenderTarget.h>
#include<hgl/graph/VKRenderResource.h>
#include<hgl/graph/RenderList.h>
#include<hgl/color/Color.h>
#include<hgl/Time.h>

//#include<hgl/graph/LookAtCameraControl.h>
#include<hgl/graph/FirstPersonCameraControl.h>

#include<hgl/io/event/KeyboardEvent.h>
#include<hgl/io/event/MouseEvent.h>

using namespace hgl;
using namespace hgl::io;
using namespace hgl::graph;

namespace hgl{namespace graph
{
    bool InitShaderCompiler();
    void CloseShaderCompiler();
}}//namespace hgl::graph

class VulkanApplicationFramework:WindowEvent
{
protected:

            Window *    win             =nullptr;
    VulkanInstance *    inst            =nullptr;

protected:

    GPUDevice *             device                      =nullptr;
    RenderPass *            device_render_pass          =nullptr;
    SwapchainRenderTarget * sc_render_target            =nullptr;

protected:

            int32_t         swap_chain_count            =0;

    RenderCmdBuffer **      cmd_buf                     =nullptr;

            Color4f         clear_color;

protected:

    RenderResource *        db                          =nullptr;
    
protected:

    ViewportInfo            vp_info;

public:

    virtual ~VulkanApplicationFramework()
    {
        CloseShaderCompiler();

        win->Unjoin(this);

        SAFE_CLEAR(db);
        SAFE_CLEAR_OBJECT_ARRAY(cmd_buf,swap_chain_count);

        SAFE_CLEAR(device);
        SAFE_CLEAR(win);
        SAFE_CLEAR(inst);
    }

    virtual bool Init(int w,int h)
    {
        if(!InitShaderCompiler())
            return(false);

        clear_color.Set(0,0,0,1);

    #ifdef _DEBUG
        if(!CheckStrideBytesByFormat())
            return(false);
    #endif//

        InitNativeWindowSystem();

        InitVulkanInstanceProperties();

        win=CreateRenderWindow(OS_TEXT("VulkanTest"));
        if(!win)
            return(false);

        if(!win->Create(w,h))
            return(false);

        {
            CreateInstanceLayerInfo cili;

            hgl_zero(cili);

            cili.lunarg.standard_validation = true;
            cili.khronos.validation = true;
            //cili.RenderDoc.Capture = true;

            inst=CreateInstance("VulkanTest",nullptr,&cili);

            if(!inst)
                return(false);
        }

        device=CreateRenderDevice(inst,win);

        if(!device)
            return(false);

        device_render_pass=device->GetRenderPass();

        db=new RenderResource(device);

        InitCommandBuffer();

        win->Join(this);

        vp_info.Set(w,h);

        return(true);
    }

    virtual void Resize(int w,int h)
    {
        vp_info.Set(w,h);
    }

    void SetClearColor(const Color4f &cc)
    {
        clear_color=cc;
    }

    void SetClearColor(const enum class COLOR &ce)
    {
        clear_color=GetColor4f(ce,1.0f);
    }

    void OnResize(uint w,uint h) override
    {
        if(w>0&&h>0)
            device->Resize(w,h);

        InitCommandBuffer();
        Resize(w,h);
    }

    void InitCommandBuffer()
    {
        if(cmd_buf)
            SAFE_CLEAR_OBJECT_ARRAY(cmd_buf,swap_chain_count);

        sc_render_target=device->GetSwapchainRT();

        swap_chain_count=sc_render_target->GetImageCount();
        {
            const VkExtent2D extent=sc_render_target->GetExtent();

            cmd_buf=hgl_zero_new<RenderCmdBuffer *>(swap_chain_count);

            for(int32_t i=0;i<swap_chain_count;i++)
                cmd_buf[i]=device->CreateRenderCommandBuffer();
        }
    }

    bool BuildCommandBuffer(RenderCmdBuffer *cb,RenderPass *rp,Framebuffer *fb,Renderable *ri)
    {   
        if(!ri)return(false);

        const IndexBuffer *ib=ri->GetIndexBuffer();

        cb->Begin();
            cb->BindFramebuffer(rp,fb);
            cb->SetClearColor(0,clear_color);
            cb->BeginRenderPass();
                cb->BindPipeline(ri->GetPipeline());
                cb->BindDescriptorSets(ri);
                cb->BindVBO(ri);

                    if (ib)
                        cb->DrawIndexed(ib->GetCount(),ri->GetInstanceCount());
                    else
                        cb->Draw(ri->GetDrawCount(),ri->GetInstanceCount());

            cb->EndRenderPass();
        cb->End();

        return(true);
    }

    void BuildCommandBuffer(RenderCmdBuffer *cb,RenderTarget *rt,Renderable *ri)
    {
        if(!cb||!rt||!ri)
            return;

        BuildCommandBuffer(cb,rt->GetRenderPass(),rt->GetFramebuffer(),ri);
    }

    bool BuildCommandBuffer(uint32_t index,Renderable *ri)
    {   
        if(!ri)return(false);

        return BuildCommandBuffer(cmd_buf[index],sc_render_target->GetRenderPass(),sc_render_target->GetFramebuffer(index),ri);
    }

    bool BuildCommandBuffer(Renderable *ri)
    {
        if(!ri)return(false);

        for(int32_t i=0;i<swap_chain_count;i++)
            BuildCommandBuffer(i,ri);

        return(true);
    }

    bool BuildCurrentCommandBuffer(Renderable *ri)
    {
        if(!ri)return(false);
    
        return BuildCommandBuffer(sc_render_target->GetCurrentFrameIndices(),ri);
    }

    void BuildCommandBuffer(uint32_t index,RenderList *rl)
    {
        if(!rl)return;

        RenderCmdBuffer *cb=cmd_buf[index];

        cb->Begin();
        cb->BindFramebuffer(sc_render_target->GetRenderPass(),sc_render_target->GetFramebuffer(index));        
        cb->SetClearColor(0,clear_color);
            cb->BeginRenderPass();
                rl->Render(cb);
            cb->EndRenderPass();
        cb->End();
    }

    void BuildCommandBuffer(RenderList *rl)
    {
        for(int32_t i=0;i<swap_chain_count;i++)
            BuildCommandBuffer(i,rl);
    }

    void BuildCurrentCommandBuffer(RenderList *rl)
    {
        BuildCommandBuffer(sc_render_target->GetCurrentFrameIndices(),rl);
    }

    template<typename ...ARGS>
    Pipeline *CreatePipeline(ARGS...args){return device_render_pass->CreatePipeline(args...);}

public:

    int AcquireNextImage()
    {
        return sc_render_target->AcquireNextImage();
    }

    virtual void SubmitDraw(int index)
    {
        VkCommandBuffer cb=*cmd_buf[index];

        sc_render_target->Submit(cb);
        sc_render_target->PresentBackbuffer();
        sc_render_target->WaitQueue();
        sc_render_target->WaitFence();
    }

    virtual void Draw()
    {
        int index=AcquireNextImage();

        if(index<0||index>=swap_chain_count)return;

        SubmitDraw(index);
    }

    bool Run()
    {
        if(!win->Update())return(false);

        if(win->IsVisible())
            Draw();

        device->WaitIdle();

        return(true);
    }
};//class VulkanApplicationFramework

class CameraKeyboardControl:public KeyboardStateEvent
{
    FirstPersonCameraControl *camera;
    float move_speed;

public:

    CameraKeyboardControl(FirstPersonCameraControl *wc)
    {
        camera=wc;
        move_speed=1.0f;
    }

    bool OnPressed(const KeyboardButton &kb)override
    {
        if(!KeyboardStateEvent::OnPressed(kb))
            return(false);

        if(kb==KeyboardButton::Minus    )move_speed*=0.9f;else
        if(kb==KeyboardButton::Equals   )move_speed*=1.1f;

        return(true);
    }

    void Update()
    {
        if(HasPressed(KeyboardButton::W     ))camera->Forward   (move_speed);else
        if(HasPressed(KeyboardButton::S     ))camera->Backward  (move_speed);else
        if(HasPressed(KeyboardButton::A     ))camera->Left      (move_speed);else
        if(HasPressed(KeyboardButton::D     ))camera->Right     (move_speed);else
        //if(HasPressed(KeyboardButton::R     ))camera->Up        (move_speed);else
        //if(HasPressed(KeyboardButton::F     ))camera->Down      (move_speed);else

        //if(HasPressed(KeyboardButton::Left  ))camera->HoriRotate( move_speed);else
        //if(HasPressed(KeyboardButton::Right ))camera->HoriRotate(-move_speed);else
        //if(HasPressed(KeyboardButton::Up    ))camera->VertRotate( move_speed);else
        //if(HasPressed(KeyboardButton::Down  ))camera->VertRotate(-move_speed);else
            return;
    }
};

class CameraMouseControl:public MouseEvent
{
    FirstPersonCameraControl *camera;
    double cur_time;
    double last_time;

    Vector2f mouse_pos;
    Vector2f mouse_last_pos;

protected:    

    bool OnPressed(int x,int y,MouseButton) override
    {
        mouse_last_pos.x=x;
        mouse_last_pos.y=y;

        last_time=cur_time;

        return(true);
    }
    
    bool OnWheel(int,int y) override
    {
        if(y==0)return(false);

        camera->Forward(float(y)/10.0f);

        return(true);
    }

    bool OnMove(int x,int y) override
    {
        mouse_pos.x=x;
        mouse_pos.y=y;

        bool left=HasPressed(MouseButton::Left);
        bool right=HasPressed(MouseButton::Right);
        
        Vector2f pos(x,y);
        Vector2f gap=pos-mouse_last_pos;
        
        if(left)
        {
            gap/=-5.0f;

            camera->Rotate(gap);
        }
        else
        if(right)
        {
            gap/=10.0f;

            camera->Move(Vector3f(gap.x,0,gap.y));
        }

        last_time=cur_time;
        mouse_last_pos=Vector2f(x,y);

        return(true);
    }

public:

    CameraMouseControl(FirstPersonCameraControl *wc)
    {
        camera=wc;
        cur_time=0;
    }

    const Vector2f &GetMouseCoord()const{return mouse_pos;}

    void Update()
    {
        cur_time=GetDoubleTime();
    }
};

class CameraAppFramework:public VulkanApplicationFramework
{

protected:

    Camera *                camera                      =nullptr;

    DeviceBuffer *          ubo_camera_info             =nullptr;

    FirstPersonCameraControl *camera_control=nullptr;

    CameraKeyboardControl * ckc=nullptr;
    CameraMouseControl *    cmc=nullptr;

    const Vector2f &GetMouseCoord()const{return cmc->GetMouseCoord();}

public:

    virtual ~CameraAppFramework()
    {
        SAFE_CLEAR(ckc);
        SAFE_CLEAR(cmc);
        SAFE_CLEAR(camera);
    }

    virtual bool Init(int w,int h)
    {
        if(!VulkanApplicationFramework::Init(w,h))
            return(false);

        InitCamera(w,h);
        return(true);
    }

    virtual void InitCamera(int w,int h)
    {
        camera_control=new FirstPersonCameraControl(&vp_info,camera);

        camera_control->Refresh();      //更新矩阵计算

        ckc=new CameraKeyboardControl(camera_control);
        cmc=new CameraMouseControl(camera_control);

        win->Join(ckc);
        win->Join(cmc);

        camera=new Camera;

        camera->pos=Vector3f(10,10,10);

        RefreshCameraInfo(&camera_control->GetCameraInfo(),&vp_info,camera);
        
        ubo_camera_info=db->CreateUBO(sizeof(CameraInfo),&camera_control->GetCameraInfo());
    }

    void Resize(int w,int h)override
    {
        vp_info.Set(w,h);

        camera_control->Refresh();

        ubo_camera_info->Write(&camera_control->GetCameraInfo());
    }

    const CameraInfo &GetCameraInfo()
    {
        return camera_control->GetCameraInfo();
    }

    DeviceBuffer *GetCameraInfoBuffer()
    {
        return ubo_camera_info;
    }

    bool BindCameraUBO(MaterialInstance *mi)
    {
        return mi->BindUBO(DescriptorSetType::Global,"g_camera",ubo_camera_info);
    }

    virtual void BuildCommandBuffer(uint32_t index)=0;

    virtual void Draw()override
    {
        camera_control->Refresh();                                  //更新相机矩阵

        ubo_camera_info->Write(&camera_control->GetCameraInfo());    //写入缓冲区

        const uint32_t index=AcquireNextImage();

        BuildCommandBuffer(index);

        SubmitDraw(index);

        ckc->Update();
        cmc->Update();
    }
};//class CameraAppFramework