#include "font.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <SDL2/SDL_opengl.h>
#include "texture.h"
#include "renderer.h"

static float colors[16][4] = {
	{0, 0, 0, 1},
	{0.5f, 0, 0, 1},
	{0, 0.5f, 0, 1},
	{0.5f, 0.5f, 0, 1},
	{0, 0, 0.5f, 1},
	{0.5f, 0, 0.5f, 1},
	{0, 0.5f, 0.5f, 1},
	{0.75f, 0.75f, 0.75f, 1},
	{0.5f, 0.5f, 0.5f, 1},
	{1, 0, 0, 1},
	{0, 1, 0, 1},
	{1, 1, 0, 1},
	{0, 0, 1, 1},
	{1, 0, 1, 1},
	{0, 1, 1, 1},
	{1, 1, 1, 1},
};

void Font::Load(const char* filename)
{
	char name[16]; strcpy(name, filename); strcat(name, ".fnt");

	FILE* fin = fopen(name, "ra");
	if (fin == NULL) return;

	char line[256];

	fgets(line, 255, fin);
	fgets(line, 255, fin);
	int lh, sw, sh;
	assert(sscanf(line, "common lineHeight=%i base=%*i scaleW=%i scaleH=%i", &lh, &sw, &sh) == 3);
	lineHeight = lh;
	bw = sw;
	bh = sh;

	fgets(line, 255, fin);
	fgets(line, 255, fin);
	int numChars;
	assert(sscanf(line, "chars count=%i", &numChars) == 1);

	for (int i = 0; i < numChars; i++) {
		fgets(line, 255, fin);
		int id, x, y, w, h, xo, yo, xa;
		assert(sscanf(line, "char id=%i x=%i y=%i width=%i height=%i xoffset=%i yoffset=%i xadvance=%i", &id, &x, &y, &w, &h, &xo, &yo, &xa) == 8);
		FontChar& c = chars[id-32];
		c.w  = w;
		c.h  = h;
		c.x1  = float(x)/float(bw);
		c.y1  = float(y)/float(bh);
		c.x2  = c.x1 + float(w)/float(bw);
		c.y2  = c.y1 + float(h)/float(bh);;
		c.xo = xo;
		c.yo = yo;
		c.xa = xa;
	}

	texture = Texture::Create();
	Texture::Load(texture, filename);
	fclose(fin);
}

void Font::Print(int x, int y, const char* text, char color)
{
	const unsigned long len = strlen(text);

	Renderer::SetState(RENDER_FILL | RENDER_BLEND | RENDER_TEXTURE);
	glBindTexture(GL_TEXTURE_2D, texture);
	glBegin(GL_QUADS);
	glColor4fv(colors[color]);
	for (int i = 0; i < len; i++) {
		FontChar& c = chars[text[i]-32];
		glTexCoord2f(c.x1, c.y1);
		glVertex2i(x+c.xo, y+c.yo);
		glTexCoord2f(c.x1, c.y2);
		glVertex2i(x+c.xo, y+c.yo+c.h);
		glTexCoord2f(c.x2, c.y2);
		glVertex2i(x+c.xo+c.w, y+c.yo+c.h);
		glTexCoord2f(c.x2, c.y1);
		glVertex2i(x+c.xo+c.w, y+c.yo);
		x += c.xa;
	}
	glEnd();

}

Vector2 Font::GetSize(const char* text)
{
	Vector2 size;
	size.y = lineHeight;
	const unsigned long len = strlen(text);
	for (int i = 0; i < len; i++) {
		//if (i == len-1) {
		//	size.x += chars[text[i]-32].w;
		//} else {
			size.x += chars[text[i]-32].xa;
		//}
	}
	return size;
}