package web

import (
	"fmt"
	"image"
	"image/jpeg"
	"net/http"
	"os"
	"path"
	"time"

	"github.com/nfnt/resize"
)

// Download used for downloading file
var Download = func(srcURL, dest string, maxWidth uint) error {
	if err := createDirectory(dest); err != nil {
		return err
	}

	var httpClient = &http.Client{
		Timeout: time.Second * 10,
	}
	resp, err := httpClient.Get(srcURL)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("got HTTP error %s", resp.Status)
	}

	image, _, err := image.Decode(resp.Body)
	if err != nil {
		return err
	}

	if maxWidth != 0 {
		image = resize.Resize(maxWidth, 0, image, resize.Lanczos3)
	}

	// Create the file
	file, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer file.Close()

	return jpeg.Encode(file, image, nil)
}

// createDirectory creates the destination directory
func createDirectory(dest string) error {
	return os.MkdirAll(path.Dir(dest), os.ModePerm)
}