package main

import (
	"crypto/md5"
	"fmt"
	"github.com/disintegration/imaging"
	"github.com/rs/zerolog/log"
	"image/jpeg"
	"net/http"
	"os"
	"path/filepath"
)

func getImagePath(url string) (string, error) {
	fileName := fmt.Sprintf("%x.png", md5.Sum([]byte(url)))
	fileName, _ = getFilePath(fileName)
	if _, err := os.Stat(fileName); os.IsNotExist(err) {
		log.Printf("Download %s", url)
		response, err := http.Get(url)
		defer response.Body.Close()
		if err != nil {
			log.Printf("Failed to download Image: %v", err)
			return "", fmt.Errorf("failed to download image")
		}
		if response.StatusCode != 200 {
			log.Printf("Received non 200 response code: %v", response.StatusCode)
			return "", fmt.Errorf("failed to download image")
		}

		i, err := jpeg.Decode(response.Body)
		if err != nil {
			log.Printf("Failed to decode Image: %v", err)
			return "", fmt.Errorf("failed to decode image")
		}
		i = imaging.Resize(i, 150, 0, imaging.Lanczos)
		err = imaging.Save(i, fileName)
		if err != nil {
			log.Printf("Failed to save Image: %v", err)
			return "", fmt.Errorf("failed to save image")
		}
	}
	return fileName, nil
}

func getFilePath(fileName string) (string, error) {
	var path string
	var err error
	if filepath.IsAbs(fileName) {
		path = fileName
	} else {
		path, err = filepath.Abs(filepath.Join(cfg.ImagePath, fileName))
		if err != nil {
			log.Error().Msg("Failed to splice path")
			return "", fmt.Errorf("failed to splice path")
		}
	}
	return path, nil
}