auto-assign-merge.yml

name: Auto Assign, Review, and Merge

on:
    pull_request:
        types:
            - opened
            - labeled
            - unlabeled
            - review_requested
            - review_request_removed
    pull_request_review:
        types:
            - submitted

jobs:
    auto-assign:
        if: github.event_name == 'pull_request'
        runs-on: ubuntu-latest
        steps:
            - name: Checkout repository
              uses: actions/checkout@v2

            - name: Set up Node.js
              uses: actions/setup-node@v2
              with:
                  node-version: "16"

            - name: Assign PR creator as Assignee
              uses: actions/github-script@v6
              with:
                  script: |
                      await github.rest.issues.addAssignees({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        issue_number: context.payload.pull_request.number,
                        assignees: [context.actor]
                      });

    auto-reviewers:
        if: github.event_name == 'pull_request'
        runs-on: ubuntu-latest
        needs: auto-assign
        steps:
            - name: Checkout repository
              uses: actions/checkout@v2

            - name: Set up Node.js
              uses: actions/setup-node@v2
              with:
                  node-version: "16"

            - name: Add reviewers based on labels
              uses: actions/github-script@v6
              with:
                  script: |
                      const prNumber = context.payload.pull_request.number;
                      const prAuthor = context.payload.pull_request.user.login;
                      const assignees = context.payload.pull_request.assignees.map(a => a.login);

                      // Define reviewers for each label
                      const BE_reviewers = ['summersummerwhy', 'ezcolin2', 'Tolerblanc'];
                      const FE_reviewers = ['yewonJin', 'djk01281'];
                      const doc_reviewers = ['summersummerwhy', 'ezcolin2', 'Tolerblanc', 'yewonJin', 'djk01281'];

                      // Function to filter out assignees and PR author
                      const filterReviewers = (reviewers) => {
                        return reviewers.filter(r => !assignees.includes(r) && r !== prAuthor);
                      };

                      // Check the labels on the PR and assign appropriate reviewers
                      const labels = context.payload.pull_request.labels.map(label => label.name);
                      let reviewersToAdd = [];

                      if (labels.includes('🐧🚀😶‍🌫️ BE')) {
                        reviewersToAdd.push(...filterReviewers(BE_reviewers));
                      }
                      if (labels.includes('🐳🐣 FE')) {
                        reviewersToAdd.push(...filterReviewers(FE_reviewers));
                      }
                      if (labels.includes('📚 Documentation')) {
                        reviewersToAdd.push(...filterReviewers(doc_reviewers));
                      }

                      // Remove duplicates if any
                      reviewersToAdd = [...new Set(reviewersToAdd)];

                      // Request reviewers
                      if (reviewersToAdd.length > 0) {
                        await github.rest.pulls.requestReviewers({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          pull_number: prNumber,
                          reviewers: reviewersToAdd
                        });
                      }

    auto-merge:
        if: github.event_name == 'pull_request_review' && github.event.action == 'submitted' && github.event.review.state == 'approved'
        runs-on: ubuntu-latest
        needs: [auto-assign, auto-reviewers]
        steps:
            - name: Checkout repository
              uses: actions/checkout@v2

            - name: Set up Node.js
              uses: actions/setup-node@v2
              with:
                  node-version: "16"

            - name: Merge and Close PR if Approved
              uses: actions/github-script@v6
              with:
                  script: |
                      const prNumber = context.payload.pull_request.number;

                      // Check if PR is already merged
                      const pr = await github.rest.pulls.get({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        pull_number: prNumber
                      });

                      if (pr.data.merged) {
                        return;
                      }

                      // Check if PR is approved
                      const reviews = await github.rest.pulls.listReviews({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        pull_number: prNumber
                      });

                      const approved = reviews.data.some(review => review.state === 'APPROVED');

                      // If approved, merge the PR
                      if (approved) {
                        await github.rest.pulls.merge({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          pull_number: prNumber
                        });

                        // Delete the branch after merge
                        const branchName = context.payload.pull_request.head.ref;
                        await github.rest.git.deleteRef({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          ref: `heads/${branchName}`
                        });
                      }