name: maintainer-absence

on:
  workflow_dispatch:
    inputs:
      startDate:
        description: 'First day of maintainer absence [mm-dd-yyyy]'
        required: true
      endDate:
        description:  'Last day of maintainer absence [mm-dd-yyyy]'
        required: true

permissions:
  issues: write

jobs:
  create-issue:
    name: create-issue
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v8
        with:
          script: |
            const startDate = new Date('${{ github.event.inputs.startDate }}');
            const endDate = new Date('${{ github.event.inputs.endDate }}');

            if (startDate > endDate) {
              throw 'Start date cannot be later than end date.';
            }

            // Calculate total days of absence
            const differenceInDays = endDate.getTime() - startDate.getTime();
            const lengthOfAbsence = differenceInDays/(1000 * 3600 * 24);

            // Create issue
            issue = await github.rest.issues.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              // Use the briefer input date format in title (instead of JavaScript's full date string)
              title: `Maintainer(s) will be away from ${{ github.event.inputs.startDate }} until ${{ github.event.inputs.endDate }}`,
              body: `The ${context.repo.repo} maintainer(s) will be away for ${lengthOfAbsence} day${lengthOfAbsence > 1 ? 's' : ''} beginning on
              ${startDate.toDateString()} and ending on ${endDate.toDateString()}. During this time, the maintainer(s)
              will not be actively monitoring PRs, discussions, etc. Please report any issues
              requiring immediate attention to [@GitCredManager](https://twitter.com/GitCredManager) on Twitter.`
            });

            // Pin issue - we use GraphQL since there is no GitHub API available for this
            const mutation = `mutation($issueId: ID!) {
              pinIssue(input: { issueId: $issueId }) {
                issue {
                  repository {
                    id
                  }
                }
              }
            }`;
            const variables = {
              issueId: issue.data.node_id
            }
            const result = await github.graphql(mutation, variables)