name: Create Internal Release Tag

on:
  workflow_dispatch:
    inputs:
      release_type:
        description: "Type of release (auto|patch|minor|major|hotfix)"
        required: true
        default: auto
        type: choice
        options: [auto, patch, minor, major, hotfix]
      hotfix_base_version:
        description: "Base version for hotfix (e.g. 2.5.0) required if release_type=hotfix"
        required: false
      dry_run:
        description: "If true, calculate but do not push tag"
        required: false
        default: "false"

permissions:
  contents: write

jobs:
  create-internal-tag:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Determine Latest Base Version
        id: latest
        run: |
          set -euo pipefail
          # List base tags (exclude track/hotfix suffixes)
          BASE_TAGS=$(git tag --list 'v[0-9]*.[0-9]*.[0-9]*' --sort=-version:refname | head -n1 || true)
          echo "Found latest base tag: $BASE_TAGS"
          echo "latest_base_tag=$BASE_TAGS" >> $GITHUB_OUTPUT

      - name: Compute Next Version (auto/patch/minor/major)
        id: compute
        if: ${{ inputs.release_type != 'hotfix' }}
        run: |
          set -euo pipefail
          RTYPE='${{ inputs.release_type }}'
          LAST='${{ steps.latest.outputs.latest_base_tag }}'
          if [ -z "$LAST" ]; then
            BASE_MAJOR=0; BASE_MINOR=0; BASE_PATCH=0
          else
            V=${LAST#v}
            IFS='.' read -r BASE_MAJOR BASE_MINOR BASE_PATCH <<< "$V"
          fi
          if [ "$RTYPE" = 'auto' ]; then
            echo "Determining bump type from commits since $LAST..."
            RANGE="$LAST..HEAD"
            [ -z "$LAST" ] && RANGE="HEAD" # first release
            LOG=$(git log --format=%s $RANGE || true)
            BUMP="patch"
            if echo "$LOG" | grep -Eiq 'BREAKING CHANGE'; then BUMP=major; fi
            if echo "$LOG" | grep -Eiq '^[a-zA-Z]+!:'; then BUMP=major; fi
            if [ "$BUMP" != major ] && echo "$LOG" | grep -Eiq '^feat(\(|:)' ; then BUMP=minor; fi
            RTYPE=$BUMP
            echo "Auto-detected bump: $RTYPE"
          fi
          case "$RTYPE" in
            major)
              NEW_MAJOR=$((BASE_MAJOR+1)); NEW_MINOR=0; NEW_PATCH=0;;
            minor)
              NEW_MAJOR=$BASE_MAJOR; NEW_MINOR=$((BASE_MINOR+1)); NEW_PATCH=0;;
            patch)
              NEW_MAJOR=$BASE_MAJOR; NEW_MINOR=$BASE_MINOR; NEW_PATCH=$((BASE_PATCH+1));;
            *) echo "Unsupported release_type for this step: $RTYPE"; exit 1;;
          esac
          NEW_VERSION="${NEW_MAJOR}.${NEW_MINOR}.${NEW_PATCH}"
          echo "base_version=$NEW_VERSION" >> $GITHUB_OUTPUT

      - name: Compute Hotfix Version
        id: hotfix
        if: ${{ inputs.release_type == 'hotfix' }}
        run: |
          set -euo pipefail
          BASE='${{ inputs.hotfix_base_version }}'
          if [ -z "$BASE" ]; then
            echo "hotfix_base_version required for hotfix release_type" >&2
            exit 1
          fi
          if ! git tag --list | grep -q "^v$BASE$"; then
            echo "Base version tag v$BASE not found (production tag required)." >&2
            exit 1
          fi
          EXISTING=$(git tag --list "v${BASE}-hotfix*" | sed -E 's/^v[0-9]+\.[0-9]+\.[0-9]+-hotfix([0-9]+).*$/\1/' | sort -n | tail -1 || true)
          if [ -z "$EXISTING" ]; then NEXT=1; else NEXT=$((EXISTING+1)); fi
          HOTFIX_VERSION="${BASE}-hotfix${NEXT}"
          echo "hotfix_version=$HOTFIX_VERSION" >> $GITHUB_OUTPUT

      - name: Decide Internal Tag
        id: tag
        run: |
          set -euo pipefail
          if [ '${{ inputs.release_type }}' = 'hotfix' ]; then
            BASE='${{ steps.hotfix.outputs.hotfix_version }}'
          else
            BASE='${{ steps.compute.outputs.base_version }}'
          fi
          INTERNAL_TAG="v${BASE}-internal.1"
          if git tag --list | grep -q "^${INTERNAL_TAG}$"; then
            echo "Tag ${INTERNAL_TAG} already exists." >&2
            exit 1
          fi
          echo "internal_tag=$INTERNAL_TAG" >> $GITHUB_OUTPUT

      - name: Dry Run Preview
        if: ${{ inputs.dry_run == 'true' }}
        run: |
          echo "DRY RUN: Would create tag ${{ steps.tag.outputs.internal_tag }} pointing to $(git rev-parse HEAD)"
          git log -5 --oneline

      - name: Create and Push Tag
        if: ${{ inputs.dry_run != 'true' }}
        run: |
          TAG='${{ steps.tag.outputs.internal_tag }}'
          MSG="Initial internal build for ${TAG}"
          git tag -a "$TAG" -m "$MSG"
          git push origin "$TAG"
          echo "Created and pushed $TAG"

      - name: Output Summary
        run: |
          echo "### Internal Tag Created" >> $GITHUB_STEP_SUMMARY
          echo "Tag: ${{ steps.tag.outputs.internal_tag }}" >> $GITHUB_STEP_SUMMARY
          echo "Release Type: ${{ inputs.release_type }}" >> $GITHUB_STEP_SUMMARY
          if [ '${{ inputs.release_type }}' = 'hotfix' ]; then
            echo "Base Hotfix Series: ${{ steps.hotfix.outputs.hotfix_version }}" >> $GITHUB_STEP_SUMMARY
          else
            echo "Base Version: ${{ steps.compute.outputs.base_version }}" >> $GITHUB_STEP_SUMMARY
          fi
          echo "Dry Run: ${{ inputs.dry_run }}" >> $GITHUB_STEP_SUMMARY