#include<hgl/graph/font/TextRender.h>
#include<hgl/graph/font/TextRenderable.h>
#include<hgl/graph/font/TileFont.h>
#include<hgl/graph/font/TextLayout.h>
#include<hgl/graph/font/TextRenderable.h>
#include<hgl/graph/VKDevice.h>

constexpr uint CHAR_BITMAP_SIZE=16;         //字符尺寸

namespace hgl
{
    namespace graph
    {
        TextRender::TextRender(GPUDevice *dev)
        {
            device=dev;
            db=new RenderResource(device);
            tl_engine=new TextLayout();
        }

        TextRender::~TextRender()
        {
            SAFE_CLEAR(tl_engine);
            SAFE_CLEAR(tile_font);
            SAFE_CLEAR(db);
        }

        bool TextRender::InitTileFont()
        {
            Font eng_fnt(OS_TEXT("Source Code Pro"),0,CHAR_BITMAP_SIZE);
            Font chs_fnt(OS_TEXT("微软雅黑"),0,CHAR_BITMAP_SIZE);

            eng_fs=AcquireFontSource(eng_fnt);
            chs_fs=AcquireFontSource(chs_fnt);

            font_source=new FontSourceMulti(eng_fs);
            font_source->AddCJK(chs_fs);

            tile_font=device->CreateTileFont(font_source);
            return(true);
        }

        bool TextRender::InitTextLayoutEngine()
        {
            CharLayoutAttr cla;
            TextLayoutAttributes tla;

            cla.CharColor=Color4f(COLOR::White);
            cla.BackgroundColor=Color4f(COLOR::Black);

            tla.char_layout_attr=&cla;
            tla.line_gap=0.1f;

            tl_engine->SetFont(tile_font->GetFontSource());
            tl_engine->Set(&tla);
            tl_engine->SetTextDirection(0);
            tl_engine->SetAlign(TextAlign::Left);
            tl_engine->SetMaxWidth(0);
            tl_engine->SetMaxHeight(0);

            return tl_engine->Init();
        }

        bool TextRender::InitUBO()
        {
            color.One();

            ubo_color=db->CreateUBO(sizeof(Color4f),&color);

            if(!ubo_color)
                return(false);

            return(true);
        }

        bool TextRender::InitMaterial(RenderPass *rp,GPUBuffer *ubo_camera_info)
        {
            material=db->CreateMaterial(OS_TEXT("res/material/LumTextureRect2D"));

            //文本渲染Position坐标全部是使用整数，这里强制要求Position输入流使用RGBA16I格式
            {
                VABConfigInfo vab_config;
                VAConfig va_cfg;

                va_cfg.format=VF_V4I16;
                va_cfg.instance=false;

                vab_config.Add("Position",va_cfg);

                material_instance=db->CreateMaterialInstance(material,&vab_config);
                if(!material_instance)return(false);
            }

            pipeline=rp->CreatePipeline(material_instance,InlinePipeline::Solid2D,Prim::SolidRectangles);
            if(!pipeline)return(false);

            sampler=db->CreateSampler();
        
            {
                MaterialParameters *mp_global=material_instance->GetMP(DescriptorSetsType::Global);
        
                if(!mp_global)
                    return(false);

                if(!mp_global->BindUBO("g_camera",ubo_camera_info))return(false);

                mp_global->Update();
            }

            {
                MaterialParameters *mp=material_instance->GetMP(DescriptorSetsType::Value);
        
                if(!mp)
                    return(false);
            
                if(!mp->BindSampler("lum_texture",tile_font->GetTexture(),sampler))return(false);            
                if(!mp->BindUBO("color_material",ubo_color))return(false);

                mp->Update();
            }

            return(true);
        }

        bool TextRender::Init(RenderPass *rp,GPUBuffer *ubo_camera_info)
        {
            if(!InitTileFont())
                return(false);

            if(!InitTextLayoutEngine())
                return(false);

            if(!InitUBO())
                return(false);

            if(!InitMaterial(rp,ubo_camera_info))
                return(false);

            return(true);
        }

        TextRenderable *TextRender::CreateRenderable()
        {
            return db->CreateTextRenderable(material);
        }

        RenderableInstance *TextRender::CreateRenderableInstance(TextRenderable *text_render_obj,const UTF16String &str)
        {
            if(tl_engine->SimpleLayout(text_render_obj,tile_font,str)<=0)
                return(nullptr);

            return db->CreateRenderableInstance(text_render_obj,material_instance,pipeline);
        }

        TextRender *CreateTextRender(GPUDevice *dev,RenderPass *rp,GPUBuffer *ubo_camera_info)
        {
            if(!dev||!rp||!ubo_camera_info)
                return(nullptr);

            TextRender *text_render=new TextRender(dev);

            if(!text_render->Init(rp,ubo_camera_info))
            {
                delete text_render;
                return(nullptr);
            }

            return text_render;
        }
    }//namespace graph
}//namespace hgl