# Tekton Task to Detect Changed Services
# This task analyzes git changes to determine which services need to be built

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: detect-changed-services
  namespace: {{ .Values.namespace }}
  labels:
    app.kubernetes.io/name: {{ .Values.labels.app.name }}
    app.kubernetes.io/component: detection
spec:
  workspaces:
    - name: source
      description: Workspace containing the source code
  results:
    - name: changed-services
      description: Comma-separated list of changed services
  steps:
    - name: detect-changes
      image: alpine/git
      script: |
        #!/bin/bash
        set -e

        cd $(workspaces.source.path)

        # Get the list of changed files
        CHANGED_FILES=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || git diff --name-only $(git rev-parse --abbrev-ref HEAD)@{upstream} HEAD 2>/dev/null || echo "")

        if [ -z "$CHANGED_FILES" ]; then
          # No changes detected, assume all services need building
          echo "No git changes detected, building all services"
          echo "all" > $(results.changed-services.path)
          exit 0
        fi

        # Initialize an array to collect changed services
        declare -a changed_services=()

        # Check for changes in services/ directory
        while IFS= read -r service_dir; do
          if [ -n "$service_dir" ]; then
            service_name=$(basename "$service_dir")
            if [[ ! " ${changed_services[@]} " =~ " ${service_name} " ]]; then
              changed_services+=("$service_name")
            fi
          fi
        done < <(echo "$CHANGED_FILES" | grep '^services/' | cut -d'/' -f2 | sort -u)

        # Check for changes in gateway/ directory
        if echo "$CHANGED_FILES" | grep -q '^gateway/'; then
          if [[ ! " ${changed_services[@]} " =~ " gateway " ]]; then
            changed_services+=("gateway")
          fi
        fi

        # Check for changes in frontend/ directory
        if echo "$CHANGED_FILES" | grep -q '^frontend/'; then
          if [[ ! " ${changed_services[@]} " =~ " frontend " ]]; then
            changed_services+=("frontend")
          fi
        fi

        # Check for changes in shared/ directory (might affect multiple services)
        if echo "$CHANGED_FILES" | grep -q '^shared/'; then
          if [[ ! " ${changed_services[@]} " =~ " shared " ]]; then
            changed_services+=("shared")
          fi
        fi

        # Convert array to comma-separated string
        CHANGED_SERVICES=""
        for service in "${changed_services[@]}"; do
          if [ -z "$CHANGED_SERVICES" ]; then
            CHANGED_SERVICES="$service"
          else
            CHANGED_SERVICES="$CHANGED_SERVICES,$service"
          fi
        done

        if [ -z "$CHANGED_SERVICES" ]; then
          # Changes are in infrastructure or other non-service files
          echo "infrastructure" > $(results.changed-services.path)
        else
          echo "$CHANGED_SERVICES" > $(results.changed-services.path)
        fi