/* sbt -- Simple Build Tool
 * Copyright 2011 Mark Harrah
 */
package sbt

import java.io.File
import java.net.URI
import Def.{ displayFull, ScopedKey, ScopeLocal, Setting }
import Attributed.data
import BuildPaths.outputDirectory
import Scope.GlobalScope
import BuildStreams.Streams
import Path._

final class BuildStructure(val units: Map[URI, LoadedBuildUnit], val root: URI, val settings: Seq[Setting[_]], val data: Settings[Scope], val index: StructureIndex, val streams: State => Streams, val delegates: Scope => Seq[Scope], val scopeLocal: ScopeLocal) {
  val rootProject: URI => String = Load getRootProject units
  def allProjects: Seq[ResolvedProject] = units.values.flatMap(_.defined.values).toSeq
  def allProjects(build: URI): Seq[ResolvedProject] = units.get(build).toList.flatMap(_.defined.values)
  def allProjectRefs: Seq[ProjectRef] = units.toSeq flatMap { case (build, unit) => refs(build, unit.defined.values.toSeq) }
  def allProjectRefs(build: URI): Seq[ProjectRef] = refs(build, allProjects(build))
  val extra: BuildUtil[ResolvedProject] = BuildUtil(root, units, index.keyIndex, data)
  private[this] def refs(build: URI, projects: Seq[ResolvedProject]): Seq[ProjectRef] = projects.map { p => ProjectRef(build, p.id) }
}
// information that is not original, but can be reconstructed from the rest of BuildStructure
final class StructureIndex(
  val keyMap: Map[String, AttributeKey[_]],
  val taskToKey: Map[Task[_], ScopedKey[Task[_]]],
  val triggers: Triggers[Task],
  val keyIndex: KeyIndex,
  val aggregateKeyIndex: KeyIndex)

/**
 * A resolved build unit.  (`ResolvedBuildUnit` would be a better name to distinguish it from the loaded, but unresolved `BuildUnit`.)
 * @param unit The loaded, but unresolved [[BuildUnit]] this was resolved from.
 * @param defined The definitive map from project IDs to resolved projects.
 *                These projects have had [[Reference]]s resolved and [[AutoPlugin]]s evaluated.
 * @param rootProjects The list of project IDs for the projects considered roots of this build.
 *                The first root project is used as the default in several situations where a project is not otherwise selected.
 */
final class LoadedBuildUnit(val unit: BuildUnit, val defined: Map[String, ResolvedProject], val rootProjects: Seq[String], val buildSettings: Seq[Setting[_]]) extends BuildUnitBase {
  assert(!rootProjects.isEmpty, "No root projects defined for build unit " + unit)
  /**
   * The project to use as the default when one is not otherwise selected.
   * [[LocalRootProject]] resolves to this from within the same build.
   */
  val root = rootProjects.head

  /** The base directory of the build unit (not the build definition).*/
  def localBase = unit.localBase

  /**
   * The classpath to use when compiling against this build unit's publicly visible code.
   * It includes build definition and plugin classes and classes for .sbt file statements and expressions.
   */
  def classpath: Seq[File] = unit.definitions.target ++ unit.plugins.classpath ++ unit.definitions.dslDefinitions.classpath

  /**
   * The class loader to use for this build unit's publicly visible code.
   * It includes build definition and plugin classes and classes for .sbt file statements and expressions.
   */
  def loader = unit.definitions.dslDefinitions.classloader(unit.definitions.loader)

  /** The imports to use for .sbt files, `consoleProject` and other contexts that use code from the build definition. */
  def imports = BuildUtil.getImports(unit)
  override def toString = unit.toString
}

// TODO: figure out how to deprecate and drop buildNames
/**
 * The built and loaded build definition, including loaded but unresolved [[Project]]s, for a build unit (for a single URI).
 *
 * @param base The base directory of the build definition, typically `<build base>/project/`.
 * @param loader The ClassLoader containing all classes and plugins for the build definition project.
 *               Note that this does not include classes for .sbt files.
 * @param builds The list of [[Build]]s for the build unit.
 *               In addition to auto-discovered [[Build]]s, this includes any auto-generated default [[Build]]s.
 * @param projects The list of all [[Project]]s from all [[Build]]s.
 *                 These projects have not yet been resolved, but they have had auto-plugins applied.
 *                 In particular, each [[Project]]'s `autoPlugins` field is populated according to their configured `plugins`
 *                 and their `settings` and `configurations` updated as appropriate.
 * @param buildNames No longer used and will be deprecated once feasible.
 */
final class LoadedDefinitions(
    val base: File,
    val target: Seq[File],
    val loader: ClassLoader,
    val builds: Seq[Build],
    val projects: Seq[Project],
    val buildNames: Seq[String],
    val dslDefinitions: DefinedSbtValues) {
  def this(base: File,
    target: Seq[File],
    loader: ClassLoader,
    builds: Seq[Build],
    projects: Seq[Project],
    buildNames: Seq[String]) = this(base, target, loader, builds, projects, buildNames, DefinedSbtValues.empty)
}

/** Auto-detected top-level modules (as in `object X`) of type `T` paired with their source names. */
final class DetectedModules[T](val modules: Seq[(String, T)]) {
  /**
   * The source names of the modules.  This is "X" in `object X`, as opposed to the implementation class name "X$".
   * The names are returned in a stable order such that `names zip values` pairs a name with the actual module.
   */
  def names: Seq[String] = modules.map(_._1)

  /**
   * The singleton value of the module.
   * The values are returned in a stable order such that `names zip values` pairs a name with the actual module.
   */
  def values: Seq[T] = modules.map(_._2)
}

/** Auto-detected auto plugin. */
case class DetectedAutoPlugin(val name: String, val value: AutoPlugin, val hasAutoImport: Boolean)

/**
 * Auto-discovered modules for the build definition project.  These include modules defined in build definition sources
 * as well as modules in binary dependencies.
 *
 * @param builds The [[Build]]s detected in the build definition.  This does not include the default [[Build]] that sbt creates if none is defined.
 */
final class DetectedPlugins(val plugins: DetectedModules[Plugin], val autoPlugins: Seq[DetectedAutoPlugin], val builds: DetectedModules[Build]) {
  /** Sequence of import expressions for the build definition.  This includes the names of the [[Plugin]], [[Build]], and [[AutoImport]] modules, but not the [[AutoPlugin]] modules. */
  lazy val imports: Seq[String] = BuildUtil.getImports(plugins.names ++ builds.names) ++
    BuildUtil.importAllRoot(autoImports(autoPluginAutoImports)) ++
    BuildUtil.importAll(autoImports(topLevelAutoPluginAutoImports)) ++
    BuildUtil.importNamesRoot(autoPlugins.map(_.name).filter(nonTopLevelPlugin))

  private[this] lazy val (autoPluginAutoImports, topLevelAutoPluginAutoImports) =
    autoPlugins.flatMap {
      case DetectedAutoPlugin(name, ap, hasAutoImport) =>
        if (hasAutoImport) Some(name)
        else None
    }.partition(nonTopLevelPlugin)

  /** A function to select the right [[AutoPlugin]]s from [[autoPlugins]] for a [[Project]]. */
  lazy val deducePlugins: (Plugins, Logger) => Seq[AutoPlugin] = Plugins.deducer(autoPlugins.toList map { _.value })

  private[this] def autoImports(pluginNames: Seq[String]) = pluginNames.map(_ + ".autoImport")

  private[this] def nonTopLevelPlugin(name: String) = name.contains('.')

}

/**
 * The built and loaded build definition project.
 * @param base The base directory for the build definition project (not the base of the project itself).
 * @param pluginData Evaluated tasks/settings from the build definition for later use.
 *                   This is necessary because the build definition project is discarded.
 * @param loader The class loader for the build definition project, notably excluding classes used for .sbt files.
 * @param detected Auto-detected modules in the build definition.
 */
final class LoadedPlugins(val base: File, val pluginData: PluginData, val loader: ClassLoader, val detected: DetectedPlugins) {
  @deprecated("Use the primary constructor.", "0.13.2")
  def this(base: File, pluginData: PluginData, loader: ClassLoader, plugins: Seq[Plugin], pluginNames: Seq[String]) =
    this(base, pluginData, loader,
      new DetectedPlugins(new DetectedModules(pluginNames zip plugins), Nil, new DetectedModules(Nil))
    )

  @deprecated("Use detected.plugins.values.", "0.13.2")
  val plugins: Seq[Plugin] = detected.plugins.values
  @deprecated("Use detected.plugins.names.", "0.13.2")
  val pluginNames: Seq[String] = detected.plugins.names

  def fullClasspath: Seq[Attributed[File]] = pluginData.classpath
  def classpath = data(fullClasspath)

}
/**
 * The loaded, but unresolved build unit.
 * @param uri The uniquely identifying URI for the build.
 * @param localBase The working location of the build on the filesystem.
 *        For local URIs, this is the same as `uri`, but for remote URIs, this is the local copy or workspace allocated for the build.
 */
final class BuildUnit(val uri: URI, val localBase: File, val definitions: LoadedDefinitions, val plugins: LoadedPlugins) {
  override def toString = if (uri.getScheme == "file") localBase.toString else (uri + " (locally: " + localBase + ")")
}

final class LoadedBuild(val root: URI, val units: Map[URI, LoadedBuildUnit]) {
  BuildUtil.checkCycles(units)
  def allProjectRefs: Seq[(ProjectRef, ResolvedProject)] = for ((uri, unit) <- units.toSeq; (id, proj) <- unit.defined) yield ProjectRef(uri, id) -> proj
  def extra(data: Settings[Scope])(keyIndex: KeyIndex): BuildUtil[ResolvedProject] = BuildUtil(root, units, keyIndex, data)

  private[sbt] def autos = GroupedAutoPlugins(units)
}
final class PartBuild(val root: URI, val units: Map[URI, PartBuildUnit])
sealed trait BuildUnitBase { def rootProjects: Seq[String]; def buildSettings: Seq[Setting[_]] }
final class PartBuildUnit(val unit: BuildUnit, val defined: Map[String, Project], val rootProjects: Seq[String], val buildSettings: Seq[Setting[_]]) extends BuildUnitBase {
  def resolve(f: Project => ResolvedProject): LoadedBuildUnit = new LoadedBuildUnit(unit, defined mapValues f toMap, rootProjects, buildSettings)
  def resolveRefs(f: ProjectReference => ProjectRef): LoadedBuildUnit = resolve(_ resolve f)
}

object BuildStreams {
  type Streams = std.Streams[ScopedKey[_]]

  final val GlobalPath = "$global"
  final val BuildUnitPath = "$build"
  final val StreamsDirectory = "streams"

  def mkStreams(units: Map[URI, LoadedBuildUnit], root: URI, data: Settings[Scope]): State => Streams = s =>
    s get Keys.stateStreams getOrElse std.Streams(path(units, root, data), displayFull, LogManager.construct(data, s))

  def path(units: Map[URI, LoadedBuildUnit], root: URI, data: Settings[Scope])(scoped: ScopedKey[_]): File =
    resolvePath(projectPath(units, root, scoped, data), nonProjectPath(scoped))

  def resolvePath(base: File, components: Seq[String]): File =
    (base /: components)((b, p) => new File(b, p))

  def pathComponent[T](axis: ScopeAxis[T], scoped: ScopedKey[_], label: String)(show: T => String): String =
    axis match {
      case Global    => GlobalPath
      case This      => sys.error("Unresolved This reference for " + label + " in " + displayFull(scoped))
      case Select(t) => show(t)
    }
  def nonProjectPath[T](scoped: ScopedKey[T]): Seq[String] =
    {
      val scope = scoped.scope
      pathComponent(scope.config, scoped, "config")(_.name) ::
        pathComponent(scope.task, scoped, "task")(_.label) ::
        pathComponent(scope.extra, scoped, "extra")(showAMap) ::
        scoped.key.label ::
        Nil
    }
  def showAMap(a: AttributeMap): String =
    a.entries.toSeq.sortBy(_.key.label).map { case AttributeEntry(key, value) => key.label + "=" + value.toString } mkString (" ")
  def projectPath(units: Map[URI, LoadedBuildUnit], root: URI, scoped: ScopedKey[_], data: Settings[Scope]): File =
    scoped.scope.project match {
      case Global                           => refTarget(GlobalScope, units(root).localBase, data) / GlobalPath
      case Select(br @ BuildRef(uri))       => refTarget(br, units(uri).localBase, data) / BuildUnitPath
      case Select(pr @ ProjectRef(uri, id)) => refTarget(pr, units(uri).defined(id).base, data)
      case Select(pr)                       => sys.error("Unresolved project reference (" + pr + ") in " + displayFull(scoped))
      case This                             => sys.error("Unresolved project reference (This) in " + displayFull(scoped))
    }

  def refTarget(ref: ResolvedReference, fallbackBase: File, data: Settings[Scope]): File =
    refTarget(GlobalScope.copy(project = Select(ref)), fallbackBase, data)
  def refTarget(scope: Scope, fallbackBase: File, data: Settings[Scope]): File =
    (Keys.target in scope get data getOrElse outputDirectory(fallbackBase).asFile) / StreamsDirectory
}