package unsplash

import (
	"io"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"git.velvettear.de/velvettear/gosplash/internal/config"
	"git.velvettear.de/velvettear/loggo"
)

// struct for images
type Image struct {
	Id   string
	Name string
	Url  string
}

// download an image to the specified output path
func (image *Image) Download() (string, error) {
	timestamp := time.Now().UnixMilli()
	if !image.IsValid() {
		return "image is invalid", nil
	}
	if image.Exists() {
		return "image already exists", nil
	}
	path := image.getPath()
	loggo.Info("downloading image '" + image.Name + "' from unsplash...")
	loggo.Debug("id: " + image.Id + " | url: " + image.Url + " | path: " + path)
	response, error := http.Get(image.Url)
	if error != nil {
		return "", error
	}
	data, error := io.ReadAll(response.Body)
	if error != nil {
		return "", error
	}
	error = os.WriteFile(path, data, 0775)
	if error != nil {
		return "", error
	}
	loggo.InfoTimed("successfully saved image '"+image.Name+"' to '"+path+"'", timestamp)
	return "", nil
}

// check if an image already exists
func (image *Image) Exists() bool {
	_, error := os.Stat(image.getPath())
	return !os.IsNotExist(error)
}

// check if an image is valid
func (image *Image) IsValid() bool {
	return len(image.Id) > 0 && len(image.Name) > 0 && len(image.Url) > 0
}

// get the output path for an image
func (image *Image) getPath() string {
	return filepath.Join(config.Output, image.Name) + ".jpeg"
}