package main

import (
	"image"
	"image/color"
	"log"
	"os"

	"github.com/disintegration/imaging"
)

type Mario struct {
	position image.Point
	dir      image.Point
	images   map[string]image.Image
	updown   string
}

func loadMario(file string) image.Image {

	reader, err := os.Open(file)
	if err != nil {
		log.Fatal(err)
	}
	rawMario, _, err := image.Decode(reader)
	if err != nil {
		log.Fatal(err)
	}
	mario := imaging.Resize(rawMario, 16, 16, imaging.Lanczos)
	return mario
}

func initialMap() map[string]image.Image {
	imageMap := make(map[string]image.Image)
	imageMap["marioUp"] = loadMario("marioUp.png")
	imageMap["marioDown"] = loadMario("marioDown.png")
	return imageMap
}

// initializes the struct for the an play animation function, this could all be dumped into function that's wrapping go routine if I wanted

// this assumes mario context is up
func (a *Animation) animateMario() {
	defer a.updateMarioPosition()
	a.ctx.SetColor(color.Black)
	a.ctx.Clear()
	if a.mario.dir.X == 1 {
		a.ctx.DrawImageAnchored(a.mario.images[a.mario.updown], a.mario.position.X, a.mario.position.Y, 0.5, 0.5)
	} else {
		a.ctx.DrawImageAnchored(imaging.FlipH(a.mario.images[a.mario.updown]), a.mario.position.X, a.mario.position.Y, 0.5, 0.5)
	}
}

// what mario does every frame
func (a *Animation) updateMarioPosition() {
	a.mario.position.X += 1 * a.mario.dir.X
	a.mario.position.Y += 1 * a.mario.dir.Y

	if a.mario.position.Y+a.height > a.ctx.Height() {
		a.mario.dir.Y = -1
		a.mario.updown = "marioUp"
	} else if a.mario.position.Y-a.height < 0 {
		a.mario.updown = "marioDown"
		a.mario.dir.Y = 1
	}

	if a.mario.position.X+a.width > a.ctx.Width() {
		a.mario.dir.X = -1
	} else if a.mario.position.X-a.width < 0 {
		a.mario.dir.X = 1
	}
}