name: Create Version Tag

on:
  workflow_run:
    workflows: ["Build and Cache"]
    types: [completed]
    branches: [main]

permissions:
  contents: write

jobs:
  create-tag:
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Extract version from package.nix
        id: version
        run: |
          VERSION=$(sed -n 's/.*version = "\([^"]*\)".*/\1/p' package.nix | head -1)
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "tag=v$VERSION" >> $GITHUB_OUTPUT

      - name: Check if tag exists
        id: check-tag
        run: |
          if git rev-parse "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Configure git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Create and push version tag
        if: steps.check-tag.outputs.exists == 'false'
        run: |
          git tag -a "v${{ steps.version.outputs.version }}" -m "Release v${{ steps.version.outputs.version }}"
          git push origin "v${{ steps.version.outputs.version }}"

      - name: Extract major version
        id: major
        run: |
          MAJOR=$(echo "${{ steps.version.outputs.version }}" | cut -d. -f1)
          echo "major=$MAJOR" >> $GITHUB_OUTPUT

      - name: Update moving tags
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          MAJOR="${{ steps.major.outputs.major }}"

          # Delete remote tags if they exist (moving tags need force update)
          git push origin :refs/tags/latest 2>/dev/null || true
          git push origin :refs/tags/v$MAJOR 2>/dev/null || true

          # Delete local tags if they exist
          git tag -d latest 2>/dev/null || true
          git tag -d v$MAJOR 2>/dev/null || true

          # Create new annotated tags
          git tag -a "latest" -m "Latest release: v$VERSION"
          git tag -a "v$MAJOR" -m "Latest v$MAJOR release: v$VERSION"

          # Push the moving tags
          git push origin latest
          git push origin "v$MAJOR"

      - name: Summary
        run: |
          echo "## Tag Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Tag | Points To |" >> $GITHUB_STEP_SUMMARY
          echo "|-----|-----------|" >> $GITHUB_STEP_SUMMARY
          if [ "${{ steps.check-tag.outputs.exists }}" == "false" ]; then
            echo "| v${{ steps.version.outputs.version }} | $(git rev-parse --short HEAD) |" >> $GITHUB_STEP_SUMMARY
          else
            echo "| v${{ steps.version.outputs.version }} | (already exists) |" >> $GITHUB_STEP_SUMMARY
          fi
          echo "| v${{ steps.major.outputs.major }} | v${{ steps.version.outputs.version }} |" >> $GITHUB_STEP_SUMMARY
          echo "| latest | v${{ steps.version.outputs.version }} |" >> $GITHUB_STEP_SUMMARY