#include <dangerzone/engine.h>
#include <dangerzone/render/misc.h>
#include <dangerzone/render/rect.h>

#include "internal/engine_internal.h"
#include "internal/util/error.h"

#include <stdint.h>

// helper function to return the correct pointer to a framebuffer for drawing selection
uint32_t*
get_framebuffer(
    framebuffer_e framebuffer
) {
    switch (framebuffer) {
    case BASE:
        return game_state->framebuffer_base;
    case OVERDRAW:
        return game_state->framebuffer_overdraw;
    default:
        return game_state->framebuffer_base;
    }
}

// alter a pixel at an imaginary x & y coordinates
void 
put_pixel(
    framebuffer_e framebuffer,
	unsigned int x, 
	unsigned int y, 
	uint32_t color
) {
    uint32_t *current_framebuffer = get_framebuffer(framebuffer);

	uint16_t w = game_state->width;
	uint16_t h = game_state->height;

	if (x < 0 || x >= w || y < 0 || y >= h) {
		eprintf(
			"CRITICAL: attempted buffer overflow in put_pixel\n"
			"at x = %d, y = %d", x, y
		);
	} else {
		current_framebuffer[game_state->width * y + x]
			= color;

	    mark_dirty_rect(x, y, 1, 1);
	}
}

// fill the entire framebuffer with a given color
void
clear_framebuffer(
    framebuffer_e framebuffer,
	uint32_t color
) {
    uint32_t *current_framebuffer = get_framebuffer(framebuffer);
    
    for (size_t i = 0;
         i < (size_t)game_state->width * game_state->height;
         ++i) {
        current_framebuffer[i] = color;
    }

    mark_dirty_rect(
        0,
        0,
        game_state->width,
        game_state->height
    );
}