package download

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"time"

	"fyne.io/fyne/v2/widget"
)

func WithProgressBar(downloadURL, filePath string, progressBar *widget.ProgressBar) error {
	client := &http.Client{
		Timeout: 15 * time.Minute,
	}

	resp, err := client.Get(downloadURL)
	if err != nil {
		return fmt.Errorf("download failed: %v", err)
	}
	defer resp.Body.Close()

	file, err := os.Create(filePath)
	if err != nil {
		return fmt.Errorf("unable to create file: %v", err)
	}
	defer file.Close()

	contentLength := resp.ContentLength
	if contentLength <= 0 {
		return fmt.Errorf("invalid content length")
	}

	progressBar.Max = float64(contentLength)

	buffer := make([]byte, 4096)
	var totalBytes int64

	for {
		n, readErr := resp.Body.Read(buffer)
		if n > 0 {
			totalBytes += int64(n)
			progressBar.SetValue(float64(totalBytes))

			if _, writeErr := file.Write(buffer[:n]); writeErr != nil {
				return fmt.Errorf("error writing to file: %v", writeErr)
			}
		}

		if readErr == io.EOF {
			break
		}
		if readErr != nil {
			return fmt.Errorf("download aborted: %v", readErr)
		}
	}

	return nil
}