#include <ft2build.h>
#include FT_FREETYPE_H
#include "Graphics.h"

#include <iostream>

namespace {
	FT_Library library;
	FT_Error error;
	FT_Face face;
}

namespace ADVect::Graphics {
	void Init() {
		error = FT_Init_FreeType(&library);
		if (error) {
			std::cerr << "FreeType init error: " << error << std::endl;
		}

		error = FT_New_Face(library, "SourceHanSans-Regular.ttc", 0, &face);
		if (error == FT_Err_Unknown_File_Format) {
			std::cerr << "FreeType Unknown_File_Format: " << error << std::endl;
		}
		else if (error) {
			std::cerr << "FreeType font loading error: " << error << std::endl;
		}

		error = FT_Set_Char_Size(face, 0, 20 * 64, 72, 72);
		if (error == FT_Err_Unknown_File_Format) {
			std::cerr << "FreeType Set_Char_Size error: " << error << std::endl;
		}
	}

	void Destroy() {
		FT_Done_Face(face);
		FT_Done_FreeType(library);
	}
	void RenderString(const NVL::String& s, u32 pos_x, u32 pos_y, const SDL_Color& attr) {
		FT_GlyphSlot slot = face->glyph;
		SDL_Rect pos = { pos_x, pos_y, 0, 0 };

		SDL_Color colors[256];
		for (u16 i = 0; i < 256; i++) {
			colors[i].r = f32(i) / 255.f * (f32)attr.r;
			colors[i].g = f32(i) / 255.f * (f32)attr.g;
			colors[i].b = f32(i) / 255.f * (f32)attr.b;
		}

		for (const auto& c : s) {
			error = FT_Load_Char(face, c, FT_LOAD_RENDER);
			if (error) continue;

			//SDL_Surface* surface = SDL_CreateRGBSurfaceFrom(
			//	slot->bitmap.buffer,
			//	slot->bitmap.width,
			//	slot->bitmap.rows,
			//	8,
			//	slot->bitmap.pitch,
			//	0, 0, 0, 255);

			//SDL_SetPaletteColors(surface->format->palette, colors, 0, 256);

			//SDL_Texture* glyph = SDL_CreateTextureFromSurface(renderer, surface);

			//SDL_SetTextureBlendMode(glyph, SDL_BlendMode::SDL_BLENDMODE_NONE);
			// SDL_SetTextureAlphaMod(glyph, attr.a);

			pos.x += slot->bitmap_left;
			pos.y -= slot->bitmap_top;
			//SDL_RenderCopy(renderer, glyph, nullptr, &pos);

			//SDL_DestroyTexture(glyph);
			//SDL_FreeSurface(surface);

			pos.x += slot->advance.x >> 6;
			pos.y += slot->advance.y >> 6;
		}
	}
	void RenderStringMarkdown(const NVL::Environment::Variable& s, u32 pos_x, u32 pos_y, const SDL_Color& attr) {
		NVL::String str = std::get<NVL::String>(s.value);
		RenderString(str, pos_x, pos_y, attr);
	}
}