#include "Display/UI/Text/GlyphCache.h"
#include <stdexcept>
#include <iostream>
#include "Display/UI/Text/FontFace.h"
#include <ft2build.h>
#include FT_FREETYPE_H

namespace Display::UI::Text
{
    GlyphCache::GlyphCache(const FontFace &fontFace) : fontFace(fontFace) {}

    const Glyph &GlyphCache::getGlyph(char c)
    {
        FT_Face face = static_cast<FT_Face>(fontFace.getFace());
        auto it = cache.find(c);
        if (it != cache.end())
            return it->second;

        if (!face)
            throw std::runtime_error("FontFace not initialized!");
        if (FT_Load_Char(face, c, FT_LOAD_RENDER))
            throw std::runtime_error("FT_Load_Char failed");
        FT_GlyphSlot g = face->glyph;

        Glyph glyph;
        glyph.width = g->bitmap.width;
        glyph.height = g->bitmap.rows;
        glyph.bearingX = g->bitmap_left;
        glyph.bearingY = g->bitmap_top;
        glyph.advance = g->advance.x >> 6;
        glyph.buffer.assign(g->bitmap.buffer, g->bitmap.buffer + g->bitmap.width * g->bitmap.rows);

        return cache.emplace(c, std::move(glyph)).first->second;
    }
} // namespace Display::UI::Text