release-pr.yml

name: Release PR

on:
  push:
    branches: [main]
    # Ignore files exclusively touched by the release/next merge to avoid
    # racing with release.yml. Side effect: a PR that only changes pubspec.yaml
    # (e.g. a dependency bump) won't immediately refresh the release PR, but
    # the daily cron covers it within 24 hours and no commits are ever lost.
    paths-ignore:
      - pubspec.yaml
      - CHANGELOG.md
  schedule:
    - cron: '0 6 * * *'
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  release-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Compute next version
        id: version
        run: |
          YEAR=$(date +'%Y')
          MONTH=$(date +'%-m')
          LATEST=$(git tag --list "v${YEAR}.${MONTH}.*" | sort -V | tail -1)
          if [ -z "$LATEST" ]; then
            PATCH=0
          else
            PATCH=$(echo "$LATEST" | sed "s/v${YEAR}\\.${MONTH}\\.//")
            PATCH=$((PATCH + 1))
          fi
          VERSION="${YEAR}.${MONTH}.${PATCH}"
          # Keep Android versionCode unique even for multiple releases on the same day.
          # Formula: YYYYMMDD * 100 + patch (e.g. 20260517 * 100 + 7 = 2026051707)
          BUILD=$(( $(date +'%Y%m%d') * 100 + PATCH ))
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "tag=v${VERSION}" >> $GITHUB_OUTPUT
          echo "pubspec_version=${VERSION}+${BUILD}" >> $GITHUB_OUTPUT

      - name: Generate release notes
        id: cliff
        uses: orhun/git-cliff-action@v4
        with:
          config: cliff.toml
          args: --unreleased --tag ${{ steps.version.outputs.tag }}
        env:
          OUTPUT: release-notes.md

      - name: Check for releasable content
        id: check
        run: |
          # Skip if git-cliff produced no version section (only header/footer)
          if grep -q '^## \[' release-notes.md 2>/dev/null; then
            echo "has_content=true" >> $GITHUB_OUTPUT
          else
            echo "has_content=false" >> $GITHUB_OUTPUT
          fi

      - name: Update CHANGELOG.md
        if: steps.check.outputs.has_content == 'true'
        run: |
          # Prepend new section; touch ensures the file exists on first run
          touch CHANGELOG.md
          cat release-notes.md CHANGELOG.md > changelog.tmp
          mv changelog.tmp CHANGELOG.md

      - name: Update pubspec.yaml version
        if: steps.check.outputs.has_content == 'true'
        run: |
          sed -i "s/^version: .*/version: ${{ steps.version.outputs.pubspec_version }}/" pubspec.yaml

      - name: Create or update release PR
        if: steps.check.outputs.has_content == 'true'
        uses: peter-evans/create-pull-request@v7
        with:
          branch: release/next
          base: main
          title: 'Release ${{ steps.version.outputs.version }}'
          body-path: release-notes.md
          commit-message: 'chore: prepare release ${{ steps.version.outputs.version }}'
          delete-branch: false