name: Auto Label PRs

on:
  pull_request:
    types: [opened, synchronize, reopened, closed]

jobs:
  apply-labels:
    runs-on: lstt5
    permissions:
      pull-requests: write
    steps:
      - name: Add labels based on branch names
        uses: actions/github-script@v6
        with:
          script: |
            const pr = context.payload.pull_request;
            const baseBranch = pr.base.ref;
            const headBranch = pr.head.ref;
            let labelsApplied = false;

            // Debug information
            console.log(`Processing PR #${pr.number}: Head: ${headBranch}, Base: ${baseBranch}`);

            // Condition 1: PR targeting amd-mainline
            if (baseBranch === 'amd-mainline') {
              const labelToAdd = 'Merge amd-mainline';
              try {
                await github.rest.issues.addLabels({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: pr.number,
                  labels: [labelToAdd]
                });
                console.log(`Added label "${labelToAdd}" to PR #${pr.number}`);
                labelsApplied = true;
              } catch (error) {
                console.error(`Error adding label "${labelToAdd}": ${error.message}`);
              }
            }

            // Condition 2: Cherry-pick based on head branch name or release target
            const isCherryPickHead = /cherry.*pick/i.test(headBranch);
            const isReleaseTargetBase = baseBranch.startsWith('release/');

            if (isCherryPickHead || isReleaseTargetBase) {
              const labelToAdd = 'cherry-pick';
              try {
                // Check if the label already exists to avoid redundant API calls if another condition also adds it (though unlikely here)
                const existingLabels = pr.labels.map(label => label.name);
                if (!existingLabels.includes(labelToAdd)) {
                  await github.rest.issues.addLabels({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: pr.number,
                    labels: [labelToAdd]
                  });
                  console.log(`Added label "${labelToAdd}" to PR #${pr.number}`);
                  labelsApplied = true;
                } else {
                  console.log(`Label "${labelToAdd}" already exists on PR #${pr.number}`);
                }
              } catch (error) {
                console.error(`Error adding label "${labelToAdd}": ${error.message}`);
              }
            }

            if (!labelsApplied) {
              console.log(`PR #${pr.number} did not match criteria for automatic labeling by this workflow.`);
            }