[PWGLF] Full process function autoconfigure for strangeness builder service (#11467)

Co-authored-by: ALICE Builder <alibuild@users.noreply.github.com>

Author: ddobrigk

PWGLF/TableProducer/Strangeness/strangenessbuilder.cxx

@@ -301,6 +301,9 @@ struct StrangenessBuilder {
 
   Configurable<int> mc_findableMode{"mc_findableMode", 0, "0: disabled; 1: add findable-but-not-found to existing V0s from AO2D; 2: reset V0s and generate only findable-but-not-found"};
 
+  // Autoconfigure process functions
+  Configurable<bool> autoConfigureProcess{"autoConfigureProcess", false, "if true, will configure process function switches based on metadata"};
+
   // V0 building options
   struct : ConfigurableGroup {
     std::string prefix = "v0BuilderOpts";
@@ -2646,6 +2649,75 @@ struct StrangenessBuilder {
 
 WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
 {
+  auto strangenessBuilderTask = adaptAnalysisTask<StrangenessBuilder>(cfgc);
+  bool isRun3 = true, hasRunInfo = false;
+  bool isMC = false, hasDataTypeInfo = false;
+  if (cfgc.options().hasOption("aod-metadata-Run") == true) {
+    hasRunInfo = true;
+    if (cfgc.options().get<std::string>("aod-metadata-Run") == "2") {
+      isRun3 = false;
+    }
+  }
+  if (cfgc.options().hasOption("aod-metadata-DataType") == true) {
+    hasDataTypeInfo = true;
+    if (cfgc.options().get<std::string>("aod-metadata-DataType") == "MC") {
+      isMC = true;
+    }
+  }
+
+  int idxSwitches[8]; // 8 switches (real / real r2 / MC / MC r2 + PID)
+  bool autoConfigureProcessConfig = true;
+  bool withPID = false;
+
+  for (size_t ipar = 0; ipar < strangenessBuilderTask.options.size(); ipar++) {
+    auto option = strangenessBuilderTask.options[ipar];
+    if (option.name == "processRealData") {
+      idxSwitches[0] = ipar;
+    }
+    if (option.name == "processRealDataRun2") {
+      idxSwitches[1] = ipar;
+    }
+    if (option.name == "processMonteCarlo") {
+      idxSwitches[2] = ipar;
+    }
+    if (option.name == "processMonteCarloRun2") {
+      idxSwitches[3] = ipar;
+    }
+    if (option.name == "processRealDataWithPID") {
+      idxSwitches[4] = ipar;
+    }
+    if (option.name == "processRealDataRun2WithPID") {
+      idxSwitches[5] = ipar;
+    }
+    if (option.name == "processMonteCarloWithPID") {
+      idxSwitches[6] = ipar;
+    }
+    if (option.name == "processMonteCarloRun2WithPID") {
+      idxSwitches[7] = ipar;
+    }
+    if (option.name == "autoConfigureProcess") {
+      autoConfigureProcessConfig = option.defaultValue.get<bool>(); // check if autoconfig requested
+    }
+    // use withPID in case preselection is requested
+    if (option.name == "preSelectOpts.preselectOnlyDesiredV0s" || option.name == "preSelectOpts.preselectOnlyDesiredCascades") {
+      withPID = withPID || option.defaultValue.get<bool>();
+    }
+  }
+  if ((!hasRunInfo || !hasDataTypeInfo) && autoConfigureProcessConfig) {
+    throw std::runtime_error("Autoconfigure requested but no metadata information found! Please check if --aod-file <file> was used in the last workflow added in the execution and if the AO2D in question has metadata saved in it.");
+  }
+
+  // positions of switches are known. Next: flip if asked for
+  if (autoConfigureProcessConfig) {
+    int relevantProcess = static_cast<int>(!isRun3) + 2 * static_cast<int>(isMC) + 4 * static_cast<int>(withPID);
+    LOGF(info, "Automatic configuration of process switches requested! Autodetected settings: isRun3? %i, isMC? %i, withPID? %i (switch #%i)", hasRunInfo, hasDataTypeInfo, isRun3, isMC, withPID, relevantProcess);
+    for (size_t idx = 0; idx < 8; idx++) {
+      auto option = strangenessBuilderTask.options[idxSwitches[idx]];
+      option.defaultValue = false; // switch all off
+    }
+    strangenessBuilderTask.options[idxSwitches[relevantProcess]].defaultValue = true;
+  }
+
   return WorkflowSpec{
-    adaptAnalysisTask<StrangenessBuilder>(cfgc)};
+    strangenessBuilderTask};
 }