# Tekton Detect Changed Services Task for Bakery-IA CI/CD
# This task identifies which services have changed in the repository

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: detect-changed-services
  namespace: tekton-pipelines
spec:
  workspaces:
    - name: source
  results:
    - name: changed-services
      description: Comma-separated list of changed services
  steps:
    - name: detect
      image: alpine/git
      script: |
        #!/bin/sh
        set -e
        cd $(workspaces.source.path)
        
        echo "Detecting changed files..."
        # Get list of changed files compared to previous commit
        CHANGED_FILES=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || git diff --name-only HEAD)
        
        echo "Changed files: $CHANGED_FILES"
        
        # Map files to services
        CHANGED_SERVICES=()
        for file in $CHANGED_FILES; do
          if [[ $file == services/* ]]; then
            SERVICE=$(echo $file | cut -d'/' -f2)
            # Only add unique service names
            if [[ ! " ${CHANGED_SERVICES[@]} " =~ " ${SERVICE} " ]]; then
              CHANGED_SERVICES+=("$SERVICE")
            fi
          elif [[ $file == frontend/* ]]; then
            CHANGED_SERVICES+=("frontend")
            break
          elif [[ $file == gateway/* ]]; then
            CHANGED_SERVICES+=("gateway")
            break
          fi
        done
        
        # If no specific services changed, check for infrastructure changes
        if [ ${#CHANGED_SERVICES[@]} -eq 0 ]; then
          for file in $CHANGED_FILES; do
            if [[ $file == infrastructure/* ]]; then
              CHANGED_SERVICES+=("infrastructure")
              break
            fi
          done
        fi
        
        # Output result
        if [ ${#CHANGED_SERVICES[@]} -eq 0 ]; then
          echo "No service changes detected"
          echo "none" | tee $(results.changed-services.path)
        else
          echo "Detected changes in services: ${CHANGED_SERVICES[@]}"
          echo $(printf "%s," "${CHANGED_SERVICES[@]}" | sed 's/,$//') | tee $(results.changed-services.path)
        fi