assign-reviewer.yml

name: Assign Unique Reviewer

on:
  pull_request:
    types: [opened, synchronize]

permissions:
  issues: write
  pull-requests: write

jobs:
  assign:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v2

      - name: Fetch organization members
        id: fetch-members
        run: |
          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            "https://api.github.com/orgs/Wannabe-Woowa-Article/members")
          ORG_MEMBERS=$(echo "$RESPONSE" | jq -r '.[].login' | tr '\n' ' ')
          echo "ORG_MEMBERS=$ORG_MEMBERS" >> $GITHUB_ENV

      - name: Fetch existing PR assignees
        id: fetch-pr-assignees
        run: |
          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            "https://api.github.com/repos/${{ github.repository }}/pulls")
          EXISTING_ASSIGNEES=$(echo "$RESPONSE" | jq -r '.[].assignees[].login' | sort | uniq | tr '\n' ' ')
          echo "EXISTING_ASSIGNEES=$EXISTING_ASSIGNEES" >> $GITHUB_ENV

      - name: Select random member
        id: select-random
        run: |
          # Convert organization members to array
          ORG_MEMBERS_ARRAY=($ORG_MEMBERS)

          # Convert existing assignees to array
          EXISTING_ASSIGNEES_ARRAY=($EXISTING_ASSIGNEES)

          # Remove PR author from organization members
          PR_AUTHOR=${{ github.event.pull_request.user.login }}
          FILTERED_MEMBERS=()
          for member in "${ORG_MEMBERS_ARRAY[@]}"; do
            if [[ "$member" != "$PR_AUTHOR" && ! " ${EXISTING_ASSIGNEES_ARRAY[@]} " =~ " ${member} " ]]; then
              FILTERED_MEMBERS+=($member)
            fi
          done

          # Check if there are any eligible members left
          if [ ${#FILTERED_MEMBERS[@]} -eq 0 ]; then
            echo "No eligible members to assign"
            exit 1
          fi

          # Select a random member from filtered members
          RANDOM_MEMBER=${FILTERED_MEMBERS[$RANDOM % ${#FILTERED_MEMBERS[@]}]}
          echo "SELECTED_MEMBER=$RANDOM_MEMBER" >> $GITHUB_ENV

      - name: Assign PR to selected member
        run: |
          curl -X POST \
            -H "Accept: application/vnd.github.v3+json" \
            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            -d '{"assignees":["${{ env.SELECTED_MEMBER }}"]}' \
            "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/assignees"