greetings.yml

name: Greetings

on: [pull_request_target, issues]

jobs:
  greeting:
    runs-on: ubuntu-latest
    permissions:
      issues: write
      pull-requests: write
    steps:
      # Check if the issue or PR already has the greeted label
      - name: Check if Already Greeted
        id: check_greeted
        uses: actions/github-script@v6
        with:
          result-encoding: string
          script: |
            const labels = await github.rest.issues.listLabelsOnIssue({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo
            });
            return labels.data.some(label => label.name === 'greeted');

      # Greeting for first interaction using actions/first-interaction
      - name: First Interaction Greeting
        if: steps.check_greeted.outputs.result == 'false'
        uses: actions/first-interaction@v1
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          issue-message: "Welcome to the Lithium! Thanks for giving us a issue."
          pr-message: "Welcome to the Lithium! Thanks for giving us a pull request."

      # General greeting for every new issue
      - name: Greet Every Issue
        if: github.event_name == 'issues' && steps.check_greeted.outputs.result == 'false'
        uses: actions/github-script@v6
        with:
          script: |
            const issueComment = `Hello @${{ github.actor }}! Thanks for raising this issue.`
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: issueComment
            });

      # General greeting for every new pull request
      - name: Greet Every PR
        if: github.event_name == 'pull_request_target' && steps.check_greeted.outputs.result == 'false'
        uses: actions/github-script@v6
        with:
          script: |
            const prComment = `Hello @${{ github.actor }}! Thanks for this PR.`
            github.rest.pulls.createReview({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: prComment,
              event: 'COMMENT'
            });

      # Add labels to new issues and PRs
      - name: Label New Issues and PRs
        if: steps.check_greeted.outputs.result == 'false'
        uses: actions/github-script@v6
        with:
          script: |
            const labels = ['needs-triage', 'greeted'];
            github.rest.issues.addLabels({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: labels
            });

      # Auto Assign Reviewers based on the time of day
      - name: Auto-assign Reviewers Based on Time of Day
        if: github.event_name == 'pull_request_target' && steps.check_greeted.outputs.result == 'false'
        uses: actions/github-script@v6
        with:
          script: |
            const hour = new Date().getHours();
            const isDayTime = hour > 8 && hour < 20;
            const reviewers = isDayTime ? ['day-reviewer1', 'day-reviewer2'] : ['night-reviewer1', 'night-reviewer2'];
            github.rest.pulls.requestReviewers({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              reviewers: reviewers
            });