WriteSummary.scala

package nl.lumc.sasc.biopet.core.summary

import java.io.{ FileInputStream, PrintWriter, File }
import java.security.MessageDigest

import nl.lumc.sasc.biopet.core.{ BiopetCommandLineFunctionTrait, SampleLibraryTag }
import nl.lumc.sasc.biopet.core.config.Configurable
import nl.lumc.sasc.biopet.utils.ConfigUtils
import org.broadinstitute.gatk.queue.function.{ QFunction, InProcessFunction }
import org.broadinstitute.gatk.utils.commandline.{ Output, Input }

import scala.collection.mutable
import scala.io.Source

/**
 * Created by pjvan_thof on 2/14/15.
 */
class WriteSummary(val root: Configurable) extends InProcessFunction with Configurable {
  this.analysisName = getClass.getSimpleName

  require(root.isInstanceOf[SummaryQScript], "root is not a SummaryQScript")

  /** To access qscript for this summary */
  val qscript = root.asInstanceOf[SummaryQScript]

  @Input(doc = "deps", required = false)
  var deps: List[File] = Nil

  @Output(doc = "Summary output", required = true)
  var out: File = qscript.summaryFile

  var md5sum: Boolean = config("summary_md5", default = true)
  //TODO: add more checksums types

  override def freezeFieldValues(): Unit = {
    for (q <- qscript.summaryQScripts) deps :+= q.summaryFile
    for ((_, l) <- qscript.summarizables; s <- l) s match {
      case f: QFunction => deps :+= f.firstOutput
      case _            =>
    }

    jobOutputFile = new File(out.getParentFile, ".%s.%s.out".format(out.getName, analysisName))

    super.freezeFieldValues()
  }

  /** Function to create summary */
  def run(): Unit = {
    for (((name, sampleId, libraryId), summarizables) <- qscript.summarizables; summarizable <- summarizables) {
      summarizable.addToQscriptSummary(qscript, name)
    }

    val pipelineMap = {
      val files = parseFiles(qscript.summaryFiles)
      val settings = qscript.summarySettings
      val executables: Map[String, Any] = {
        (for (f <- qscript.functions if f.isInstanceOf[BiopetCommandLineFunctionTrait]) yield {
          f match {
            case f: BiopetCommandLineFunctionTrait => {
              f.configName -> Map("version" -> f.getVersion,
                "md5" -> BiopetCommandLineFunctionTrait.executableMd5Cache.getOrElse(f.executable, None))
            }
            case _ => throw new IllegalStateException("This should not be possible")
          }

        }).toMap
      }

      val map = Map(qscript.summaryName -> ((if (settings.isEmpty) Map[String, Any]() else Map("settings" -> settings)) ++
        (if (files.isEmpty) Map[String, Any]() else Map("files" -> Map("pipeline" -> files))) ++
        (if (executables.isEmpty) Map[String, Any]() else Map("executables" -> executables.toMap))))

      qscript match {
        case tag: SampleLibraryTag => prefixSampleLibrary(map, tag.sampleId, tag.libId)
        case _                     => map
      }
    }

    val jobsMap = (for (
      ((name, sampleId, libraryId), summarizables) <- qscript.summarizables;
      summarizable <- summarizables
    ) yield {
      val map = Map(qscript.summaryName -> parseSummarizable(summarizable, name))

      (prefixSampleLibrary(map, sampleId, libraryId),
        (v1: Any, v2: Any, key: String) => summarizable.resolveSummaryConflict(v1, v2, key))
    }).foldRight(pipelineMap)((a, b) => ConfigUtils.mergeMaps(a._1, b, a._2))

    val combinedMap = (for (qscript <- qscript.summaryQScripts) yield {
      ConfigUtils.fileToConfigMap(qscript.summaryFile)
    }).foldRight(jobsMap)((a, b) => ConfigUtils.mergeMaps(a, b))

    val writer = new PrintWriter(out)
    writer.println(ConfigUtils.mapToJson(combinedMap).spaces4)
    writer.close()
  }

  def prefixSampleLibrary(map: Map[String, Any], sampleId: Option[String], libraryId: Option[String]): Map[String, Any] = {
    sampleId match {
      case Some(sampleId) => Map("samples" -> Map(sampleId -> (libraryId match {
        case Some(libraryId) => Map("libraries" -> Map(libraryId -> map))
        case _               => map
      })))
      case _ => map
    }
  }

  /**
   * Convert summarizable to a summary map
   * @param summarizable
   * @param name
   * @return
   */
  def parseSummarizable(summarizable: Summarizable, name: String) = {
    val stats = summarizable.summaryStats
    val files = parseFiles(summarizable.summaryFiles)

    (if (stats.isEmpty) Map[String, Any]() else Map("stats" -> Map(name -> stats))) ++
      (if (files.isEmpty) Map[String, Any]() else Map("files" -> Map(name -> files)))
  }

  /**
   * Parse files map to summary map
   * @param files
   * @return
   */
  def parseFiles(files: Map[String, File]): Map[String, Map[String, Any]] = {
    for ((key, file) <- files) yield key -> parseFile(file)
  }

  /**
   * parse single file summary map
   * @param file
   * @return
   */
  def parseFile(file: File): Map[String, Any] = {
    val map: mutable.Map[String, Any] = mutable.Map()
    map += "path" -> file.getAbsolutePath
    if (md5sum) map += "md5" -> parseChecksum(SummaryQScript.md5sumCache(file))
    map.toMap
  }

  /**
   * Retrive checksum from file
   * @param checksumFile
   * @return
   */
  def parseChecksum(checksumFile: File): String = {
    Source.fromFile(checksumFile).getLines().toList.head.split(" ")(0)
  }
}