name: "Pull Request: Get metadata"

on:
  workflow_call:
    outputs:
      isRenovatePR:
        description: "Is the PR coming from Renovate?"
        value: ${{ jobs.pr-metadata.outputs.isRenovatePR }}
      isFork:
        description: "Is the PR coming from a forked repo?"
        value: ${{ jobs.pr-metadata.outputs.isFork }}
      addedOrModified:
        description: "Does the PR contain any changes?"
        value: ${{ jobs.pr-changes.outputs.addedOrModified }}
      addedOrModifiedFiles:
        description: "A list of the files changed in this PR"
        value: ${{ jobs.pr-changes.outputs.addedOrModifiedFiles }}
      addedOrModifiedCharts:
        description: "A list of the charts changed in this PR"
        value: ${{ jobs.pr-changes.outputs.addedOrModifiedCharts }}

jobs:
  pr-metadata:
    name: Collect PR metadata
    runs-on: ubuntu-latest
    outputs:
      isRenovatePR: ${{ startsWith(steps.branch-name.outputs.current_branch, 'renovate/') }}
      isFork: ${{ github.event.pull_request.head.repo.full_name != github.repository }}
    steps:
      - name: Get branch name
        id: branch-name
        uses: tj-actions/branch-names@v5.1

  pr-changes:
    name: Collect PR changes
    runs-on: ubuntu-latest
    outputs:
      addedOrModified: ${{ steps.filter.outputs.addedOrModified }}
      addedOrModifiedFiles: ${{ steps.filter.outputs.addedOrModified_files }}
      addedOrModifiedCharts: ${{ steps.filter-charts.outputs.addedOrModified }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Collect changed files
        uses: dorny/paths-filter@v2
        id: filter
        with:
          list-files: shell
          filters: |
            addedOrModified:
              - added|modified: 'charts/**'

      - name: Collect changed charts
        if: |
          steps.filter.outputs.addedOrModified == 'true'
        id: filter-charts
        run: |
          CHARTS=()
          PATHS=(${{ steps.filter.outputs.addedOrModified_files }})
          # Get only the chart paths
          for CHARTPATH in "${PATHS[@]}"
          do
            IFS='/' read -r -a path_parts <<< "${CHARTPATH}"
            CHARTS+=("${path_parts[1]}/${path_parts[2]}")
          done

          # Remove duplicates
          CHARTS=( `printf "%s\n" "${CHARTS[@]}" | sort -u` )
          # Set output to changed charts
          printf "::set-output name=addedOrModified::%s\n" "${CHARTS[*]}"