#include "texture.h"
#define STB_IMAGE_IMPLEMENTATION
#define STBI_NO_FAILURE_STRINGS
#include "stb_image.h"
#include <SDL2/SDL_opengl.h>

namespace Texture
{
	unsigned texture = 0;

	unsigned Create(const int w, const int h)
	{
		unsigned texture;
		glGenTextures(1, &texture);
		glBindTexture(GL_TEXTURE_2D, texture);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		if (w != -1) glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
		return texture;
	}

	const bool Load(const unsigned& texture, const char* filename)
	{
		int x,y,n;
		char name[400]; strcpy(name, filename);
		if (strrchr(filename, '.') == nullptr) strcat(name, ".png");
		unsigned char *data = stbi_load(name, &x, &y, &n, 4);
		if (data == nullptr) return false;

		glBindTexture(GL_TEXTURE_2D, texture);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);

		stbi_image_free(data);

		return true;
	}

	uint8_t* Load(const char* filename)
	{
		int x,y,n;
		char name[400]; strcpy(name, filename);
		if (strrchr(filename, '.') == nullptr) strcat(name, ".png");
		unsigned char *data = stbi_load(name, &x, &y, &n, 4);
		return data;
	}

	void Update(const unsigned& texture, const int w, const int h, const uint8_t* data)
	{
		glBindTexture(GL_TEXTURE_2D, texture);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
	}
}

namespace Bitmap
{
	void PutPixel(uint8_t* data, const int x, const int y, const Color& color)
	{
		memcpy(&data[x+y*128], &color, 4);
	}

	const Color GetPixel(uint8_t* data, const int x, const int y)
	{
		Color color;
		data += (x+y*128);
		color.r = *(data++);
		color.g = *(data++);
		color.b = *(data++);
		color.a = *(data++);
		return color;
	}
}