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package net.chestmc

import net.chestmc.common.extensions.create
import net.chestmc.common.extensions.file
import net.chestmc.common.extensions.numbers.spaced
import java.io.File
import java.net.HttpURLConnection
import java.net.URL

/**
 * Represents a downloader used to download files from a URL.
 */
object Downloader {

  /**
   * Downloads the file at specified url and returns the file.
   */
  fun download(url: URL, print: Boolean = false): File {
    val connection = url.openConnection() as HttpURLConnection
    val name = url.file.substring(url.file.lastIndexOf('/') + 1)
    val file = kotlin.io.path.createTempFile(name).toFile()

    if (print)
      println("Downloading $name...")

    connection.inputStream.buffered().use { input ->
      file.outputStream().buffered().use { output ->
        val copy = (input.copyTo(output) / 1024).spaced()

        if (print)
          println("Downloaded $name with $copy kb size")
      }
    }

    return file
  }

  /**
   * Downloads the file at specified url and implements inside of the specified folder
   * and returns the file.
   */
  fun download(url: URL, to: File, print: Boolean = false): File {
    val name = url.file.substring(url.file.lastIndexOf('/') + 1)
    val file = file(to, name)

    if (file.exists()) return file else file.create()
    val connection = url.openConnection() as HttpURLConnection

    if (print)
      println("Downloading $name...")

    connection.inputStream.buffered().use { input ->
      file.outputStream().buffered().use { output ->
        val copy = (input.copyTo(output) / 1024).spaced()

        if (print)
          println("Downloaded $name with $copy kb size")
      }
    }

    return file
  }
}