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/* sbt -- Simple Build Tool
 * Copyright 2011 Sanjin Sehic
 */

package sbt

import sbt.internal.BuildLoader
import sbt.internal.librarymanagement.StringUtilities

import sbt.io.{ Hash, IO }

import java.io.File
import java.net.URI

import BuildLoader.ResolveInfo
import RichURI.fromURI
import java.util.Locale

import scala.sys.process.Process

object Resolvers {
  type Resolver = BuildLoader.Resolver

  val local: Resolver = (info: ResolveInfo) => {
    val uri = info.uri
    val from = new File(uri)
    val to = uniqueSubdirectoryFor(uri, in = info.staging)

    if (from.isDirectory) Some { () => if (from.canWrite) from else creates(to) { IO.copyDirectory(from, to) } }
    else None
  }

  val remote: Resolver = (info: ResolveInfo) => {
    val url = info.uri.toURL
    val to = uniqueSubdirectoryFor(info.uri, in = info.staging)

    Some { () => creates(to) { IO.unzipURL(url, to) } }
  }

  val subversion: Resolver = (info: ResolveInfo) => {
    def normalized(uri: URI) = uri.copy(scheme = "svn")

    val uri = info.uri.withoutMarkerScheme
    val localCopy = uniqueSubdirectoryFor(normalized(uri), in = info.staging)
    val from = uri.withoutFragment.toASCIIString
    val to = localCopy.getAbsolutePath

    if (uri.hasFragment) {
      val revision = uri.getFragment
      Some {
        () =>
          creates(localCopy) {
            run("svn", "checkout", "-q", "-r", revision, from, to)
          }
      }
    } else
      Some {
        () =>
          creates(localCopy) {
            run("svn", "checkout", "-q", from, to)
          }
      }
  }

  val mercurial: Resolver = new DistributedVCS {
    override val scheme = "hg"

    override def clone(from: String, to: File): Unit = {
      run("hg", "clone", "-q", from, to.getAbsolutePath)
    }

    override def checkout(branch: String, in: File): Unit = {
      run(Some(in), "hg", "checkout", "-q", branch)
    }
  }.toResolver

  val git: Resolver = (info: ResolveInfo) => {
    val uri = info.uri.withoutMarkerScheme
    val localCopy = uniqueSubdirectoryFor(uri.copy(scheme = "git"), in = info.staging)
    val from = uri.withoutFragment.toASCIIString

    if (uri.hasFragment) {
      val branch = uri.getFragment
      Some { () =>
        creates(localCopy) {
          run("git", "clone", from, localCopy.getAbsolutePath)
          run(Some(localCopy), "git", "checkout", "-q", branch)
        }
      }
    } else Some { () =>
      creates(localCopy) {
        run("git", "clone", "--depth", "1", from, localCopy.getAbsolutePath)
      }
    }
  }

  abstract class DistributedVCS {
    val scheme: String

    def clone(from: String, to: File)

    def checkout(branch: String, in: File)

    def toResolver: Resolver = (info: ResolveInfo) => {
      val uri = info.uri.withoutMarkerScheme
      val localCopy = uniqueSubdirectoryFor(normalized(uri), in = info.staging)
      val from = uri.withoutFragment.toASCIIString

      if (uri.hasFragment) {
        val branch = uri.getFragment
        Some {
          () =>
            creates(localCopy) {
              clone(from, to = localCopy)
              checkout(branch, in = localCopy)
            }
        }
      } else Some { () => creates(localCopy) { clone(from, to = localCopy) } }
    }

    private def normalized(uri: URI) = uri.copy(scheme = scheme)
  }

  private lazy val onWindows = {
    val os = System.getenv("OSTYPE")
    val isCygwin = (os != null) && os.toLowerCase(Locale.ENGLISH).contains("cygwin")
    val isWindows = System.getProperty("os.name", "").toLowerCase(Locale.ENGLISH).contains("windows")
    isWindows && !isCygwin
  }

  def run(command: String*): Unit =
    run(None, command: _*)

  def run(cwd: Option[File], command: String*): Unit = {
    val result = Process(
      if (onWindows) "cmd" +: "/c" +: command
      else command,
      cwd
    ) !;
    if (result != 0)
      sys.error("Nonzero exit code (" + result + "): " + command.mkString(" "))
  }

  def creates(file: File)(f: => Unit) =
    {
      if (!file.exists)
        try {
          f
        } catch {
          case e: Throwable =>
            IO.delete(file)
            throw e
        }
      file
    }

  def uniqueSubdirectoryFor(uri: URI, in: File) = {
    in.mkdirs()
    val base = new File(in, Hash.halfHashString(uri.normalize.toASCIIString))
    val last = shortName(uri) match { case Some(n) => normalizeDirectoryName(n); case None => "root" }
    new File(base, last)
  }

  private[this] def shortName(uri: URI): Option[String] =
    Option(uri.withoutMarkerScheme.getPath).flatMap {
      _.split("/").map(_.trim).filterNot(_.isEmpty).lastOption
    }

  private[this] def normalizeDirectoryName(name: String): String =
    StringUtilities.normalize(dropExtensions(name))

  private[this] def dropExtensions(name: String): String = name.takeWhile(_ != '.')

}