# -----------------------------------------------------------------------------
# Workflow: Bump Dev Version
#
# Description:
# This GitHub Actions workflow automatically increments the version number
# defined in `Config.xcconfig` on every push to the `dev` branch.
#
# Versioning Logic:
# - Reads the `APP_VERSION` from `Config.xcconfig`.
# - If the version is in `MAJOR.MINOR.PATCH.BUILD` format (4 digits),
#   the `BUILD` number is incremented by 1.
# - If the version is in `MAJOR.MINOR.PATCH` format (3 digits),
#   a `.1` is appended to start a `BUILD` count.
#
# Example:
# - `0.5.0` → `0.5.0.1`
# - `0.5.0.3` → `0.5.0.4`
#
# The updated version is then committed and pushed back to the `dev` branch.
#
# Prerequisites:
# - `APP_VERSION` must exist and be defined using the format:
#    APP_VERSION = x.y.z or x.y.z.w
# - GitHub Actions bot must have workflow permission to push to `dev`.
# -----------------------------------------------------------------------------

name: Bump Dev Version

on:
  push:
    branches:
      - dev

jobs:
  bump-version:
    if: github.repository_owner == 'nightscout'
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

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

      - name: Bump dev version number in Config.xcconfig
        run: |
          FILE=Config.xcconfig

          # Find the line with APP_VERSION and extract the value
          VERSION_LINE=$(grep -E '^APP_VERSION *= *[0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?' "$FILE")
          CURRENT_VERSION=$(echo "$VERSION_LINE" | sed -E 's/^APP_VERSION *= *//')
          
          # Split version into components (up to 4)
          IFS='.' read -r MAJOR MINOR FIX BUILD <<< "$CURRENT_VERSION"

          # If 4th digit not present, start at 1; else increment
          if [ -z "$BUILD" ]; then
            BUILD=1
          else
            BUILD=$((BUILD + 1))
          fi

          # Construct new version
          NEW_VERSION="$MAJOR.$MINOR.$FIX.$BUILD"
          echo "New version: $NEW_VERSION"

          # Escape dots in current version for sed replacement
          ESCAPED_CURRENT_VERSION=$(echo "$CURRENT_VERSION" | sed 's/\./\\./g')

          # Replace the APP_VERSION line in-place with new version
          if [[ "$OSTYPE" == "darwin"* ]]; then
            sed -i '' -E "s/APP_VERSION *= *$ESCAPED_CURRENT_VERSION/APP_VERSION = $NEW_VERSION/" "$FILE"
          else
            sed -i -E "s/APP_VERSION *= *$ESCAPED_CURRENT_VERSION/APP_VERSION = $NEW_VERSION/" "$FILE"
          fi

          # Export version so it's available in the next step
          echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV

      - name: Commit and push changes
        run: |
          git add Config.xcconfig
          git commit -m "CI: Bump dev version to $NEW_VERSION"
          git push