package main

import (
	"fmt"
	"time"

	rl "github.com/gen2brain/raylib-go/raylib"
)

const MAXPOINTS = 100

func main() {
	rl.InitWindow(1200, 800, "raylib [core] example - basic window")
	defer rl.CloseWindow()

	rl.SetTargetFPS(60)

	rl.BeginDrawing()
	rl.WaitTime(1)
	rl.ClearBackground(rl.RayWhite)
	rl.DrawText("Congrats! You created your first window!", 190, 200, 20, rl.LightGray)

	rl.EndDrawing()

	var particleWidth float32 = 200
	var particleHeight float32 = 200
	var particleColumnCount int = 10
	var particleRowCount int = MAXPOINTS / particleColumnCount
	var particleRadius float32 = 10
	var particleColor rl.Color = rl.Black
	var particleLeftCornerPos rl.Vector2 = rl.Vector2{500, 300}
	var gravity rl.Vector2 = rl.Vector2{0, 10}
	//var stepSize float32 = 10
	var particleSpeed rl.Vector2 = rl.Vector2{0, -100} //pixel pro zeitinkrement
	var timeIncrement float32 = 0.1
	var particleList = [MAXPOINTS]rl.Vector2{}

	for y := 0; y < (particleColumnCount); y++ {
		for x := 0; x < particleRowCount; x++ {
			if (y == particleColumnCount) && (x >= MAXPOINTS%particleColumnCount) {
				fmt.Println(y, x)
			} else {
				newParticle := rl.NewVector2(particleWidth*(float32(x)/float32(particleRowCount))+particleLeftCornerPos.X, particleHeight*(float32(y)/float32(particleColumnCount))+particleLeftCornerPos.Y)
				particleList[y*particleRowCount+x] = newParticle
			}
		}
	}
	for j := float32(0); j < 20; {
		rl.BeginDrawing()
		time.Sleep(time.Duration(timeIncrement*100) * time.Millisecond)
		for i := 0; i < MAXPOINTS; i++ {
			rl.DrawCircleV(particleList[i], particleRadius, particleColor)
			particleList[i] = rl.Vector2Add(particleList[i], rl.Vector2Scale(particleSpeed, timeIncrement))
		}
		rl.EndDrawing()
		rl.ClearBackground(rl.RayWhite)
		fmt.Println(particleList)
		particleSpeed = rl.Vector2Add(particleSpeed, rl.Vector2Scale(gravity, timeIncrement))
		j += timeIncrement
	}

}