name: Pull Request Conference Sort & All-contrib

on:
  pull_request_target:
    paths:
    - '_data/conferences.yml'
    types:
    - closed
    branches:
    - main
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'PR number to reference (leave empty for sort-only)'
        required: false
        type: string
      contributor:
        description: 'GitHub username to add as contributor (leave empty to skip)'
        required: false
        type: string

# Add permissions block here
permissions:
  contents: write
  pull-requests: write

jobs:
  process-changes:
    runs-on: ubuntu-latest
    # Only check for merged PR when triggered by a pull_request event
    # And skip if PR was merged by a bot
    if: >-
      (github.event_name == 'workflow_dispatch' || (github.event.pull_request.merged == true && !contains(github.event.pull_request.user.login, '[bot]') && !contains(github.event.pull_request.user.login, '-bot') && github.event.pull_request.user.login != 'dependabot' && github.event.pull_request.user.login != 'github-actions'))
    steps:
    - name: Checkout repository
      uses: actions/checkout@v7
      with:
        token: ${{ secrets.GITHUB_TOKEN }}

    - name: Setup Pixi
      uses: prefix-dev/setup-pixi@v0.10.0

    - name: Set variables
      id: vars
      run: |
        if [[ "${{ github.event_name }}" == "pull_request" || "${{ github.event_name }}" == "pull_request_target" ]]; then
          # For PR-triggered workflow
          echo "pr_number=${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
          echo "contributor=${{ github.event.pull_request.user.login }}" >> $GITHUB_OUTPUT
          echo "branch_name=automated-updates-${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
        else
          # For manually triggered workflow
          PR_REF="${{ github.event.inputs.pr_number }}"
          CONTRIBUTOR="${{ github.event.inputs.contributor }}"

          if [[ -n "$PR_REF" ]]; then
            echo "pr_number=$PR_REF" >> $GITHUB_OUTPUT
            echo "branch_name=automated-updates-$PR_REF" >> $GITHUB_OUTPUT
          else
            # Generate a timestamp if no PR number provided
            TIMESTAMP=$(date +%Y%m%d%H%M%S)
            echo "pr_number=manual-$TIMESTAMP" >> $GITHUB_OUTPUT
            echo "branch_name=automated-updates-$TIMESTAMP" >> $GITHUB_OUTPUT
          fi

          if [[ -n "$CONTRIBUTOR" ]]; then
            echo "contributor=$CONTRIBUTOR" >> $GITHUB_OUTPUT
          else
            echo "contributor=" >> $GITHUB_OUTPUT
          fi
        fi

    - name: Create branch and make changes
      id: changes
      run: |
        # Create a new branch
        BRANCH_NAME="${{ steps.vars.outputs.branch_name }}"
        git checkout -b $BRANCH_NAME

        # Run sort command
        pixi run sort

        # Add contributor if specified and they don't already have the "conference" contribution
        # This check avoids a bug in all-contributors-cli (issue #371) where
        # adding an existing contribution type replaces all existing contributions
        if [[ -n "${{ steps.vars.outputs.contributor }}" ]]; then
          CONTRIBUTOR="${{ steps.vars.outputs.contributor }}"
          # Check if contributor already has "conference" contribution (the overlap triggers the bug).
          # IMPORTANT: there must be NO unconditional `all-contributors add` before this guard.
          # all-contributors-cli replaces a contributor's whole contributions array when re-adding an
          # existing type, so re-adding "conference" to someone who already has it strips their other
          # contributions. The guard below is the ONLY add path: skip when "conference" is already present.
          if ! jq -e --arg login "$CONTRIBUTOR" '.contributors[] | select(.login == $login) | .contributions | index("conference")' .all-contributorsrc > /dev/null 2>&1; then
            echo "Adding conference contribution for: $CONTRIBUTOR"
            pixi run install
            pixi run add "$CONTRIBUTOR" conference
          else
            echo "Contributor $CONTRIBUTOR already has conference contribution, skipping to avoid contribution loss (all-contributors-cli bug #371)"
          fi
        fi

        # Check if there are changes
        git status
        if git diff --exit-code --quiet; then
          echo "No changes detected in working directory"
          echo "has_changes=false" >> $GITHUB_OUTPUT
        else
          echo "has_changes=true" >> $GITHUB_OUTPUT

          # Stage and commit changes
          git config --global user.name 'github-actions[bot]'
          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
          git add _data/* .all-contributorsrc README.md CONTRIBUTING.md || true

          # Create commit message
          COMMIT_MSG="chore: updates"
          git commit -m "$COMMIT_MSG"

          # Push the branch to the remote repository
          git push -u origin $BRANCH_NAME
        fi

    - name: Manual PR creation
      if: steps.changes.outputs.has_changes == 'true'
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        BRANCH_NAME: ${{ steps.vars.outputs.branch_name }}
      run: |
        # Check if PR already exists
        PR_EXISTS=$(gh pr list --head $BRANCH_NAME --json number | jq 'length')

        if [[ "$PR_EXISTS" == "0" ]]; then
          # Create a new PR
          gh pr create \
            --title "chore: sort & add contributor" \
            --body "Automated workflow update

            Changes include:
            - Sorted conferences
            - Added contributor

            Please review and merge these automated updates." \
            --base main \
            --head $BRANCH_NAME
        else
          echo "Pull request from branch $BRANCH_NAME already exists."
        fi