// Simple citro2d sprite drawing example
// Images borrowed from:
//   https://kenney.nl/assets/space-shooter-redux
#include <citro2d.h>

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include "sprites.h"

#define MAX_SPRITES   768
#define SCREEN_WIDTH  400
#define SCREEN_HEIGHT 240

// Simple sprite struct
typedef struct {
	C2D_Sprite spr;
	float x, y, w; // pos, rot
} Sprite;

// init spritesheet
static C2D_SpriteSheet spriteSheet;
static Sprite sprites[MAX_SPRITES];

static void initSprites() {
	size_t numImages = C2D_SpriteSheetCount(spriteSheet);

	for (size_t i = 0; i < numImages; i++) {
		Sprite* thisSprite = &sprites[i];
		float x = SCREEN_WIDTH / 4;
		float y = SCREEN_HEIGHT / 3;

		C2D_SpriteFromSheet(&thisSprite->spr, spriteSheet, i);
		C2D_SpriteSetCenter(&thisSprite->spr, 0.5f, 0.5f);
		C2D_SpriteSetPos(&thisSprite->spr, x, y);
		thisSprite->x = x;
		thisSprite->y = y;
		thisSprite->w = 0;
	}

}

void moveSprite(Sprite *spr, s16 dx, s16 dy) {
	// stop sprite going OOB
	if (spr->x >= SCREEN_WIDTH || spr->x < 1 || spr->y >= SCREEN_HEIGHT || spr->x < 1) {
		return;
	}

	spr->x += dx;
	spr->y += dy;

	C2D_SpriteSetPos(&spr->spr, spr->x, spr->y);
}

void rotateSprite(Sprite *spr, float dw) {

}

int main(int argc, char* argv[]) {

    // Init libs
    romfsInit();
    gfxInitDefault();
    C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
    C2D_Init(C2D_DEFAULT_MAX_OBJECTS);
    C2D_Prepare();
    consoleInit(GFX_BOTTOM, NULL);

    // Create screens
    C3D_RenderTarget* top = C2D_CreateScreenTarget(GFX_TOP, GFX_LEFT);
    // C3D_RenderTarget* bottom = C2D_CreateScreenTarget(GFX_BOTTOM, GFX_LEFT);

    // Load graphics
    spriteSheet = C2D_SpriteSheetLoad("romfs:/gfx/sprites.t3x");
    if (!spriteSheet) {
        svcBreak(USERBREAK_PANIC);
    }

	// Initialize sprites
    initSprites();

	// init gravity calc vars
	float a = 0.4f; // acceleration
	float v = 0; // velocity

	// set bg properties
	C2D_SpriteSetPos(&sprites[SPR_BG].spr, 200, 120); // center bg
	C2D_SpriteSetScale(&sprites[SPR_BG].spr, 2.7778, 2.7907); // scale image to 400x240 (3ds screen res)
	

    // score sprite & int
    int score = 0;
    Sprite scoreSprite;

    // Main loop
    while (aptMainLoop()) {
        hidScanInput();

        // Respond to user input
        u32 kDown = hidKeysDown();
		u32 kHeld = hidKeysHeld();
        if (kDown & KEY_START)
            break; // break in order to return to hbmenu


		// gravity calcs
		v += a;
		moveSprite(&sprites[SPR_BIRD], 0, v);

		if (kDown & KEY_A) {
			v = -5.5;
			moveSprite(&sprites[SPR_BIRD], 0, v);
		}


        // Render the scene
        C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
        C2D_SceneBegin(top);
		

		C2D_DrawSprite(&sprites[SPR_BG].spr);

		// C2D_SceneBegin(bottom);
        C2D_DrawSprite(&sprites[SPR_BIRD].spr);
        C3D_FrameEnd(0);

    }

    // Delete graphics
    C2D_SpriteSheetFree(spriteSheet);

    // Deinit libs
    C2D_Fini();
    C3D_Fini();
    gfxExit();
    romfsExit();
    return 0;
}