#include "wapp.h"
#include "raylib.h"
#include <stdint.h>
#include <assert.h>

#define WIDTH 1280
#define HEIGHT 720
#define HALF_WIDTH (WIDTH * 0.5f)
#define HALF_HEIGHT (HEIGHT * 0.5f)
#define MAX_OBJ_DIM 30
#define MIN_OBJ_DIM 15
#define BG_COLOR (Color){.r = 0xea, .g = 0xf2, .b = 0xe3, .a = 0xff}
#define FG_COLOR (Color){.r = 0x42, .g = 0x4C, .b = 0x55, .a = 0xff}
#define OBJECT_COUNT 10
#define MSG_BUF_LEN 4096
#define abs(A) (A < 0 ? A * -1 : A)
#define min(A, B) (A < B ? A : B)
#define max(A, B) (A > B ? A : B)

#define OBJECT_COMMON struct {Position position; Scale scale;}

typedef struct Position Position;
struct Position {
  f32 x;
  f32 y;
};

typedef struct Scale Scale;
struct Scale {
  f32 width;
  f32 height;
};

typedef struct Velocity Velocity;
struct Velocity {
  f32 x;
  f32 y;
};

typedef struct Wanderer Wanderer;
struct Wanderer {
  OBJECT_COMMON;
  Velocity velocity;
};

typedef struct SlowZone SlowZone;
struct SlowZone {
  OBJECT_COMMON;
};

void init_wanderer(Wanderer *wanderer, XOR256State *state);
void move_wanderer(Wanderer *wanderer);
f32 get_random_float(XOR256State *state);

int main(void) {
  InitWindow(WIDTH, HEIGHT, "DOD test");
  SetTargetFPS(120);

  Allocator arena   = wapp_mem_arena_allocator_init(MB(10));
  XOR256State state = wapp_prng_xorshift_init_state();
  Wanderer *objects   = wapp_mem_allocator_alloc(&arena, sizeof(Wanderer) * OBJECT_COUNT);
  assert(objects != NULL);

  for (u64 i = 0; i < OBJECT_COUNT; ++i) {
    Wanderer *object = &(objects[i]);
    init_wanderer(object, &state);
  }

  while (!WindowShouldClose()) {
    for (u64 i = 0; i < OBJECT_COUNT; ++i) {
      Wanderer *object = &(objects[i]);
      move_wanderer(object);
    }

    BeginDrawing();

    ClearBackground(BG_COLOR);

    for (u64 i = 0; i < OBJECT_COUNT; ++i) {
      Wanderer *object = &(objects[i]);
      DrawRectangle(
          (i32)object->position.x,
          (i32)object->position.y,
          (i32)object->scale.width,
          (i32)object->scale.height,
          FG_COLOR
      );
    }

    EndDrawing();
  }

  wapp_mem_arena_allocator_destroy(&arena);

  CloseWindow();

  return 0;
}

void init_wanderer(Wanderer *wanderer, XOR256State *state) {
  wanderer->position = (Position){
    .x = wapp_prng_xorshift_256(state) % WIDTH,
    .y = wapp_prng_xorshift_256(state) % HEIGHT,
  };

  f32 scale = (f32)((wapp_prng_xorshift_256(state) % (MAX_OBJ_DIM + 1 - MIN_OBJ_DIM)) + MIN_OBJ_DIM);
  wanderer->scale = (Scale){
    .width  = scale,
    .height = scale,
  };

  wanderer->velocity = (Velocity){
    .x = get_random_float(state),
    // .y = get_random_float(state),
    .y = 0.0f,
  };
}

void move_wanderer(Wanderer *wanderer) {
  wanderer->position.x += wanderer->velocity.x;
  wanderer->position.y += wanderer->velocity.y;

  if (wanderer->position.x > WIDTH ||
      wanderer->position.x + wanderer->scale.width < 0 ||
      wanderer->position.y > HEIGHT ||
      wanderer->position.y + wanderer->scale.height < 0
  ) {
  }
}

f32 get_random_float(XOR256State *state) {
  i64 random = (i64)wapp_prng_xorshift_256(state) - INT64_MAX;
  return (f32)(random) / (f32)(INT64_MAX);
}