#include "Font.h"

#include <map>

namespace charcoal
{
	image_loader::ImageRGBA Font::get_text_image(const std::string& text)
	{
		image_loader::ImageRGBA output;
		std::map<char, const image_loader::ImageRGBA&> image_map;
		output.width = 0;
		output.height = 0;
		for (std::string::size_type i = 0; i < text.size(); ++i)
		{
			// Load the image for the character
			auto character_image = image_map.find(text[i]);
			if (character_image == image_map.end())
			{
				auto insertion_result = image_map.emplace(text[i], get_character(text[i]));
				character_image = insertion_result.first;
			}
			output.width += character_image->second.width;
			output.height = character_image->second.height > output.height ? character_image->second.height : output.height;
		}
		// Allocate the vector
		output.data.resize(output.width * output.height * 4); // * 4 for R, G, B, A channels
		int character_offset = 0;
		for (std::string::size_type i = 0; i < text.size(); ++i)
		{
			const image_loader::ImageRGBA& character_image = image_map.find(text[i])->second;
			
			for (unsigned int y = 0; y < character_image.height; ++y)
			{
				for (unsigned int x = 0; x < character_image.width; ++x)
				{
					unsigned char red;
					unsigned char green;
					unsigned char blue;
					unsigned char alpha;
					character_image.get_pixel(x, y, red, green, blue, alpha);
					output.set_pixel(x + character_offset, y, red, green, blue, alpha);
				}
			}

			character_offset += character_image.width;
		}
		return output;
	}
}