# 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
  labels:
    app.kubernetes.io/name: bakery-ia-cicd
    app.kubernetes.io/component: detect
spec:
  workspaces:
    - name: source
      description: Source code workspace
  params:
    - name: base-ref
      type: string
      description: Base reference for comparison (default HEAD~1)
      default: "HEAD~1"
  results:
    - name: changed-services
      description: Comma-separated list of changed services
    - name: changed-files-count
      description: Number of files changed
  steps:
    - name: detect
      image: alpine/git:2.43.0
      script: |
        #!/bin/sh
        set -e

        SOURCE_PATH="$(workspaces.source.path)"
        BASE_REF="$(params.base-ref)"

        cd "$SOURCE_PATH"

        echo "============================================"
        echo "Detect Changed Services"
        echo "============================================"
        echo "Base ref: $BASE_REF"
        echo "============================================"

        # Get list of changed files compared to base reference
        echo ""
        echo "Detecting changed files..."

        # Try to get diff, fall back to listing all files if this is the first commit
        CHANGED_FILES=$(git diff --name-only "$BASE_REF" HEAD 2>/dev/null || git ls-tree -r HEAD --name-only)

        FILE_COUNT=$(echo "$CHANGED_FILES" | grep -c "." || echo "0")
        echo "Found $FILE_COUNT changed files"
        echo "$FILE_COUNT" > $(results.changed-files-count.path)

        if [ "$FILE_COUNT" = "0" ]; then
          echo "No files changed"
          echo "none" > $(results.changed-services.path)
          exit 0
        fi

        echo ""
        echo "Changed files:"
        echo "$CHANGED_FILES" | head -20
        if [ "$FILE_COUNT" -gt 20 ]; then
          echo "... and $((FILE_COUNT - 20)) more files"
        fi

        # Map files to services using simple shell (no bash arrays)
        echo ""
        echo "Mapping files to services..."

        CHANGED_SERVICES=""

        # Process each file
        echo "$CHANGED_FILES" | while read -r file; do
          if [ -z "$file" ]; then
            continue
          fi

          # Check services directory
          if echo "$file" | grep -q "^services/"; then
            SERVICE=$(echo "$file" | cut -d'/' -f2)
            if [ -n "$SERVICE" ] && ! echo "$CHANGED_SERVICES" | grep -q "$SERVICE"; then
              if [ -z "$CHANGED_SERVICES" ]; then
                CHANGED_SERVICES="$SERVICE"
              else
                CHANGED_SERVICES="$CHANGED_SERVICES,$SERVICE"
              fi
              echo "$CHANGED_SERVICES" > /tmp/services.txt
            fi
          fi

          # Check frontend
          if echo "$file" | grep -q "^frontend/"; then
            if ! echo "$CHANGED_SERVICES" | grep -q "frontend"; then
              if [ -z "$CHANGED_SERVICES" ]; then
                CHANGED_SERVICES="frontend"
              else
                CHANGED_SERVICES="$CHANGED_SERVICES,frontend"
              fi
              echo "$CHANGED_SERVICES" > /tmp/services.txt
            fi
          fi

          # Check gateway
          if echo "$file" | grep -q "^gateway/"; then
            if ! echo "$CHANGED_SERVICES" | grep -q "gateway"; then
              if [ -z "$CHANGED_SERVICES" ]; then
                CHANGED_SERVICES="gateway"
              else
                CHANGED_SERVICES="$CHANGED_SERVICES,gateway"
              fi
              echo "$CHANGED_SERVICES" > /tmp/services.txt
            fi
          fi

          # Check infrastructure
          if echo "$file" | grep -q "^infrastructure/"; then
            if ! echo "$CHANGED_SERVICES" | grep -q "infrastructure"; then
              if [ -z "$CHANGED_SERVICES" ]; then
                CHANGED_SERVICES="infrastructure"
              else
                CHANGED_SERVICES="$CHANGED_SERVICES,infrastructure"
              fi
              echo "$CHANGED_SERVICES" > /tmp/services.txt
            fi
          fi
        done

        # Read the accumulated services
        if [ -f /tmp/services.txt ]; then
          CHANGED_SERVICES=$(cat /tmp/services.txt)
        fi

        echo ""
        echo "============================================"

        # Output result
        if [ -z "$CHANGED_SERVICES" ]; then
          echo "No service changes detected"
          echo "none" > $(results.changed-services.path)
        else
          echo "Detected changes in services: $CHANGED_SERVICES"
          echo "$CHANGED_SERVICES" > $(results.changed-services.path)
        fi

        echo "============================================"
      resources:
        limits:
          cpu: 200m
          memory: 128Mi
        requests:
          cpu: 50m
          memory: 64Mi