name: Calculate Next Version from release history

on:
  workflow_dispatch:
  workflow_call:
    outputs:
      next_version:
        description: "The next semantic version"
        value: ${{ jobs.calculate-version.outputs.next_version }}
      next_version_major:
        description: "The next semantic version (major)"
        value: ${{ jobs.calculate-version.outputs.next_version_major }}
      next_version_minor:
        description: "The next semantic version (minor)"
        value: ${{ jobs.calculate-version.outputs.next_version_minor }}

jobs:
  calculate-version:
    runs-on: ubuntu-latest
    outputs:
      next_version: ${{ steps.calculate_next_version.outputs.next_version }}
      next_version_major: ${{ steps.calculate_next_version.outputs.next_version_major }}
      next_version_minor: ${{ steps.calculate_next_version.outputs.next_version_minor }}      
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Get all releases
        id: get_all_releases
        run: |
          # Fetch all releases and check for API errors
          RESPONSE=$(curl -s -o response.json -w "%{http_code}" "https://api.github.com/repos/${{ github.repository }}/releases?per_page=100")
          if [ "$RESPONSE" -ne 200 ]; then
            echo "Failed to fetch releases. HTTP status: $RESPONSE"
            cat response.json
            exit 1
          fi
          
          # Extract and sort tags
          ALL_TAGS=$(jq -r '.[].tag_name' response.json | grep -E '^v[0-9]+\.[0-9]+(-[0-9]+)?$' | sed 's/-.*//' | sort -V | tail -n 1)

          # Exit if no tags were found
          if [ -z "$ALL_TAGS" ]; then
            echo "No valid tags found."
            exit 1
          fi

          echo "::set-output name=tag::$ALL_TAGS"
          # echo "tag=$ALL_TAGS" >> $GITHUB_STATE

      - name: Calculate next semver minor
        id: calculate_next_version
        run: |
          LATEST_VERSION=${{ steps.get_all_releases.outputs.tag }}

          # strip 'v' prefix and split into major.minor
          LATEST_VERSION=${LATEST_VERSION//v/}
          IFS='.' read -r -a VERSION_PARTS <<< "$LATEST_VERSION"

          MAJOR=${VERSION_PARTS[0]}
          MINOR=${VERSION_PARTS[1]}

          # increment the minor version
          MINOR=$((MINOR + 1))

          NEXT_VERSION="${MAJOR}.${MINOR}"

          echo "Major: $MAJOR"
          echo "Minor: $MINOR"

          echo "Next version: $NEXT_VERSION"
          echo "::set-output name=next_version::$NEXT_VERSION"
          echo "::set-output name=next_version_major::$MAJOR"
          echo "::set-output name=next_version_minor::$MINOR"