package main

import (
	"image"
	"log"
	"math/rand"
	"os"
	"path/filepath"
	"strings"
)

// load an image from a file into an Image value
func loadImage(filename string) image.Image {
	img, err := os.Open(filename)
	if err != nil {
		log.Fatal(err)
	}
	defer img.Close()

	imgData, _, err := image.Decode(img)
	if err != nil {
		log.Fatal(err)
	}

	log.Println("Loading :", filename)

	return imgData
}

// Walk through a folder recursively and returns a list of image paths
func getImagesList(path string) []string {
	var imgs []string
	err := filepath.Walk(path,
		func(path string, info os.FileInfo, err error) error {
			ext := strings.ToLower(filepath.Ext(path))
			if err != nil {
				return err
			}
			if ext == ".jpg" || ext == ".png" {
				imgs = append(imgs, path)
			}
			return nil
		})

	if err != nil {
		log.Println(err)
	}

	return imgs
}

// Randomly choose x number of image from a given folder
func getRandomImage() string {
	dir := getImagesList(ConfigRegister.InputDir)
	index := rand.Intn(len(dir))
	return dir[index]
}