name: Create Release Branch

on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Release version (SemVer format, e.g., 1.2.3 or 2.0.0-rc.1)'
        required: true
        type: string

permissions:
  contents: write

jobs:
  create-release-branch:
    name: Create Release Branch
    runs-on: ubuntu-latest
    environment: release

    steps:
      - name: Validate SemVer format
        id: validate
        run: |
          VERSION="${{ github.event.inputs.version }}"

          # SemVer regex: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
          SEMVER_REGEX='^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?$'

          if ! echo "$VERSION" | grep -Pq "$SEMVER_REGEX"; then
            echo "Error: Version '$VERSION' is not valid SemVer format"
            echo "Examples: 1.2.3, 2.0.0-rc.1, 1.0.0-beta.2+build.123"
            exit 1
          fi

          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

          # Check if pre-release (contains hyphen)
          if echo "$VERSION" | grep -q '-'; then
            echo "Detected pre-release version: $VERSION"
          else
            echo "Detected stable release version: $VERSION"
          fi

      - name: Checkout code
        uses: actions/checkout@v5
        with:
          token: ${{ secrets.PUBLISHER_TOKEN }}

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

      - name: Check if branch exists
        run: |
          BRANCH_NAME="release/${{ steps.validate.outputs.version }}"

          if git ls-remote --heads origin "$BRANCH_NAME" | grep -q "$BRANCH_NAME"; then
            echo "Error: Branch '$BRANCH_NAME' already exists"
            exit 1
          fi

          echo "Branch '$BRANCH_NAME' does not exist, proceeding..."

      - name: Create release branch and update version
        run: |
          BRANCH_NAME="release/${{ steps.validate.outputs.version }}"
          VERSION="${{ steps.validate.outputs.version }}"

          # Create and checkout new branch
          git checkout -b "$BRANCH_NAME"

          # Update version.py
          echo "__version__ = \"$VERSION\"" > src/version.py

          # Commit changes
          git add src/version.py
          git commit -m "chore: bump version to $VERSION"

          # Push branch (this will trigger the publish workflow)
          git push origin "$BRANCH_NAME"

          echo "✅ Created branch '$BRANCH_NAME'"
          echo "✅ Updated version to $VERSION"
          echo "✅ The publish workflow will now build Docker images and create the GitHub release"