#include "externals.hh"
#include "ui-app.hh"
#include "ui-imgui-sdl.hh"

#include <imgui_internal.h>


/*= T_UIApp =================================================================*/

namespace {
#include "font-awesome.inl"

static const ImWchar IconsRanges_[] = {
	ICON_MIN_FA ,
	ICON_MAX_FA ,
	0
};
} // namespace <anon>

T_UIApp::T_UIApp( )
{
	SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER );

	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER , 1 );
	SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE , 24 );
	SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE , 8 );
	SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION , 2 );
	SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION , 2 );

	SDL_DisplayMode current;
	SDL_GetCurrentDisplayMode( 0 , &current );
	window = SDL_CreateWindow( "DEMO",
			SDL_WINDOWPOS_CENTERED , SDL_WINDOWPOS_CENTERED ,
			1280 , 720 ,
			SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE );
	gl = SDL_GL_CreateContext( window );
	glewInit( );
	if ( !GLEW_VERSION_4_5 ) {
		fprintf( stderr , "OpenGL 4.5 required\n" );
		exit( 1 );
	}

	ImGui_ImplSdl_Init( window );

	using namespace ImGui;
	StyleColorsDark( );
	ImGuiIO& io{ GetIO( ) };
	io.IniFilename = nullptr;
	{
		ImFontConfig cfg;
		cfg.SizePixels = 13.0f;
		defaultFont_ = io.Fonts->AddFontDefault( &cfg );

		ImFontConfig icons;
		icons.MergeMode = true;
		icons.PixelSnapH = true;
		io.Fonts->AddFontFromMemoryCompressedBase85TTF(
				FontAwesome__compressed_data_base85 , 13.f ,
				&icons , IconsRanges_ );
	}
	{
		ImFontConfig cfg;
		cfg.SizePixels = 9.0f;
		smallFont_ = io.Fonts->AddFontDefault( &cfg );

		ImFontConfig icons;
		icons.MergeMode = true;
		icons.PixelSnapH = true;
		icons.DstFont = smallFont_;
		io.Fonts->AddFontFromMemoryCompressedBase85TTF(
				FontAwesome__compressed_data_base85 , 9.f ,
				&icons , IconsRanges_ );
	}
}

T_UIApp::~T_UIApp( )
{
	ImGui_ImplSdl_Shutdown( );
	SDL_GL_DeleteContext( gl );
	SDL_DestroyWindow( window );
	SDL_Quit( );
}

void T_UIApp::addAction(
		T_UIAction action ) noexcept
{
	actions_.set( std::move( action ) );
}

void T_UIApp::actionMenu(
		T_String const& id ) const noexcept
{
	auto const* const a{ actions_.get( id ) };
	if ( a ) {
		a->menuItem( );
	}
}

void T_UIApp::actionButton(
		T_String const& id ) const noexcept
{
	auto const* const a{ actions_.get( id ) };
	if ( a ) {
		a->tbButton( );
	}
}

void T_UIApp::startFrame(
		const bool capture ,
		ImVec2 const& mouseInitial ) const
{
	ImGui_ImplSdl_NewFrame( window , capture , mouseInitial );
}

void T_UIApp::warpMouse(
		ImVec2 const& pos ) const
{
	SDL_WarpMouseInWindow( window , pos.x , pos.y );
}

void T_UIApp::swap( ) const
{
	SDL_GL_SwapWindow( window );
}

void T_UIApp::handleDialogs( ) noexcept
{
	const auto nDialogs{ modals_.size( ) };
	for ( auto i = 0u ; i < nDialogs ; i ++ ) {
		const bool keep{ modals_[ i ]->draw( ) };
		assert( keep || i + 1 == nDialogs );
		if ( !keep ) {
			modals_.removeLast( );
		}
	}
}