name: New PR

permissions:
  issues: write
  pull-requests: write

on:
  pull_request_target:
    types: [opened, reopened, labeled, unlabeled, synchronize]

jobs:
  check-pr:
    runs-on: ubuntu-latest
    env:
      PR_LABEL: 'New PR'
      BLOCK_HOURS: '24' # use e.g. 0.25 for testing

    steps:
      - name: Check PR age, label if recent, and block merging if labeled
        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { owner, repo } = context.repo;
            const pr = context.payload.pull_request;
            const prNumber = pr.number;
            const labelName = process.env.PR_LABEL;
            const hoursLimit = parseFloat(process.env.BLOCK_HOURS);

            // Helper function to get current labels on a PR
            async function getPrLabels(owner, repo, prNumber) {
              const labelsResp = await github.rest.issues.listLabelsOnIssue({
                owner,
                repo,
                issue_number: prNumber
              });
              return labelsResp.data.map(l => l.name);
            }

            // Fetch PR details and labels
            const { data: prDetails } = await github.rest.pulls.get({
              owner,
              repo,
              pull_number: prNumber
            });
            var labelNames = await getPrLabels(owner, repo, prNumber);

            // 1. Add or remove label based on age
            const now = new Date();
            const createdAt = new Date(prDetails.created_at);
            const ageInHours = (now - createdAt) / (1000 * 60 * 60);
            console.log(`ℹ️ PR #${prNumber} is ${ageInHours.toFixed(2)}h old.`);

            if (ageInHours <= hoursLimit && !labelNames.includes(labelName)) {
              console.log(`🔖 Adding label "${labelName}" to PR #${prNumber} as less than ${hoursLimit}h old.`);
              try {
                await github.rest.issues.addLabels({
                  owner,
                  repo,
                  issue_number: prNumber,
                  labels: [labelName]
                });
                labelNames.push(labelName); // Keep local list in sync
              } catch (error) {
                console.log(`⚠️ Could not add label "${labelName}": ${error.message}`);
              }
            } else if (ageInHours > hoursLimit && labelNames.includes(labelName)) {
              console.log(`🔖 Removing label "${labelName}", PR age ${ageInHours.toFixed(2)}h.`);
              try {
                await github.rest.issues.removeLabel({
                  owner,
                  repo,
                  issue_number: prNumber,
                  name: labelName
                });
                labelNames = labelNames.filter(e => e !== labelName); // Update local array
              } catch (error) {
                console.log(`⚠️ Could not remove label "${labelName}": ${error.message}`);
              }
            }

            // 2. Block merging if label still present
            if (labelNames.includes(labelName)) {
              core.setFailed(`❌ This pull request is a "${labelName}" and cannot be merged until ${hoursLimit} hours after creation.`);
            } else {
              console.log('✅ PR is mergeable.');
            }