#include "gfx.h"
//all the global variables first set here
SDL_Window *mwindowp; // main window were everything foes
SDL_DisplayMode * screenp;
SDL_Renderer * renderp;
TTF_Font * fontp;
SDL_Surface * msurface;
bool surface;
int maxx;
int maxy;
int initgfx(int x, int y,const  char * title) {
	//initializing SDL 2
	SDL_Init(SDL_INIT_EVERYTHING);
	//sets global variables for ease of access later
	//they are 100 by 200 for now because DisplayMode takes long to implement
	//screen resizes are handled by sdl events
	//we're not gonna hcange these for now
	maxx = x;
	maxy = y;
	//makes sdl compatible with opengl(for later use)
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
	//creates window
	mwindowp = SDL_CreateWindow(title, 0, 0, maxx, maxy, SDL_WINDOW_OPENGL);
	//renderer to write to
	//the int selects which drivers, -1 just selects first applicatble
	renderp = SDL_CreateRenderer(mwindowp, -1,SDL_RENDERER_ACCELERATED);
	//load truetype font
	int err = TTF_Init();
	fontp = TTF_OpenFont("Terminus.ttf",18);
	if (fontp == NULL) {
		printf("font failed to load\n");
		printf("ttf error %s",TTF_GetError());
	}
	return 0;
}
int surfacerender(int w, int h) {
	msurface = SDL_CreateRGBSurface(0, w, h, 32, 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
}
//two draw functions for convenience
int drawimg(int x, int y, int w, int h,SDL_Texture * tex) {
	SDL_Rect r;
	r.x = x;
	r.y = y;
	r.w = w;
	r.h = h;
	//null means entire source texture
	SDL_RenderCopy(renderp, tex, NULL, &r);
	return 0;
		
}
int drawimg(SDL_Rect r, SDL_Texture  * tex) {
	SDL_RenderCopy(renderp, tex, NULL, &r);
	return 0;
}
SDL_Texture * loadtexture(const char * file) {
	SDL_Surface * tsp;
	SDL_Texture * ttp;
	tsp = SDL_LoadBMP(file);
	ttp = SDL_CreateTextureFromSurface(renderp, tsp);
	SDL_SetTextureBlendMode(ttp, SDL_BLENDMODE_BLEND);
	SDL_FreeSurface(tsp);
	return ttp;
}
int drawimg(int x, int y, int w, int h, const char * file) {
	SDL_Texture * ttp = loadtexture(file);	
	drawimg(x,y,w,h,ttp);
	SDL_DestroyTexture(ttp);
}
int drawrect (int x, int y, int w, int h, const char * color) {
	std::string str;
	str = color;
	SDL_Rect r;
	r.x = x;
	r.y = y;
	r.w = w;
	r.h = h;
	if (!str.compare("red")) {
		SDL_SetRenderDrawColor(renderp,255,0,0,255);
	} 
	if (!str.compare("blue")) {
		SDL_SetRenderDrawColor(renderp,0,0,255,255);
	}
	if (!str.compare("orange")) {
		SDL_SetRenderDrawColor(renderp,255,180,20,255);
	}
	if (!str.compare("white")) {
		SDL_SetRenderDrawColor(renderp,255,255,255,255);
	}
	if (!str.compare("black")) {
		SDL_SetRenderDrawColor(renderp,0,0,0,255);
	}
	SDL_RenderFillRect(renderp,&r);
	SDL_SetRenderDrawColor(renderp,0,0,0,255);
	return 0;
}
int drawrect (int x, int y, int w, int h,int r, int g, int b, int a) {
	SDL_Rect rect;
	rect.x = x;
	rect.y = y;
	rect.w = w;
	rect.h = h;
	SDL_SetRenderDrawColor(renderp,r,g,b,a);
	SDL_SetRenderDrawBlendMode(renderp, SDL_BLENDMODE_BLEND);
	SDL_RenderFillRect(renderp,&rect);
	SDL_SetRenderDrawColor(renderp,0,0,0,255);
	return 0;
}
//draws text
int drawtext(int x, int y,const char * text, SDL_Color c) {
	//surface the font renderer writes to
	SDL_Surface * sp;
	//color of text
	SDL_Color co;
	co.r = 100;
	co.g = 100;
	co.b = 100;
	co.a = 100;
	//renders text with global font
	sp = TTF_RenderText_Solid(fontp, text, c);
	//texture to actually draw
	SDL_Texture * tp;
	tp = SDL_CreateTextureFromSurface(renderp, sp);
	//the surface has to be freed because it is only used once and the pointer
	//to it was declared in a funcion
	SDL_FreeSurface(sp);
	//finding the width and height of the text
	int w;
	int h;
	SDL_QueryTexture(tp, NULL, NULL, &w, &h);
	//drawing the texture
	drawimg(x, y, w, h, tp);
	SDL_DestroyTexture(tp);
}
//this is where almost all of the grame code is
int updategfx() {

	//checks the states of the buttons and handles them accordingly
	
	//clears renderer buffer
	
	SDL_RenderPresent(renderp);
	return 0;
}
int cleargfx() {
	SDL_RenderClear(renderp);
}
//quits all the libraries and releases some memory
int quitgfx() {
	//release of context
	SDL_DestroyRenderer(renderp);
	TTF_Quit();
	SDL_Quit();
	return 0;
}