name: Flutter Candidate Update
on:
  workflow_dispatch: # Allows for manual triggering if needed
  # TODO(https://github.com/flutter/devtools/issues/7939): Re-enable once Flutter candidates
  # are tagged again.
  # schedule:
  #   # * is a special character in YAML so you have to quote this string
  #   - cron: "0 8/12 * * *" # Run every day at midnight and noon Pacific Time

permissions:
  contents: write
  pull-requests: write

env:
  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

jobs:
  update-candidate:
    if: ${{ github.repository == 'flutter/devtools' }}
    name: Update Flutter Candidate Version
    runs-on: ubuntu-latest
    steps:
      - name: git clone devtools
        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
        with:
          ref: master

      - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672

      - name: setup git config
        run: |

          git config user.name "DevTools Workflow Bot"
          git config user.email "dart-devtool-workflow-bot@google.com"

      - name: get the latest flutter candidate
        run: |
          set -ex
          pushd tool/
          dart pub get
          popd

          tool/latest_flutter_candidate.sh | sed 's|refs/tags/||' > flutter-candidate.txt

      - name: Create the PR
        run: |
          set -ex
          if ! [[ `git status --porcelain --untracked-files=no` ]]; then
            # No changes made, so we can just exit.
            echo "No change to the flutter-candidate.txt file"
            exit
          fi
          COMMIT_MESSAGE="Changing Flutter Candidate to $(cat flutter-candidate.txt)"
          BRANCH_NAME="auto-candidate-$(date +%s)"
          # Stage the file, commit and push
          git checkout -b "$BRANCH_NAME"
          git add .
          git commit -m "$COMMIT_MESSAGE"
          git push -u origin "$BRANCH_NAME"


          PR_URL=$(gh pr create --title "$COMMIT_MESSAGE" --body "Automated Flutter candidate version bump.") 

          # Change github credentials back to the actions bot.
          GH_TOKEN="$ORIGINAL_GH_TOKEN"

          gh pr edit $PR_URL --add-label "autosubmit"

        env:
          GH_TOKEN: ${{ secrets.DEVTOOLS_WORKFLOW_BOT_TOKEN }}
          ORIGINAL_GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}