name: Auto Label Pull Requests

on:
  pull_request_target:
    branches: ["main"]
    types: [opened, synchronize, reopened, edited]

jobs:
  autolabeler:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    env:
      CONFIG_PATH: .github/autolabeler-config.json
    steps:
      - name: Label PR based on config rules
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs').promises;
            const { minimatch } = require('minimatch');

            const configPath = process.env.CONFIG_PATH;
            let config;
            try {
              const fileContent = await fs.readFile(configPath, 'utf-8');
              config = JSON.parse(fileContent);
            } catch (error) {
              console.error(`❌ Issue while load config file: ${error.message}`);
              return;
            }

            const prNumber = context.payload.pull_request.number;
            const prFiles = (await github.rest.pulls.listFiles({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber,
            })).data;

            let labelsToAdd = new Set();

            for (const [label, rules] of Object.entries(config)) {
              if (prFiles.some(prFile =>
                rules.some(rule =>
                  (!rule.fileStatus || rule.fileStatus === prFile.status) &&
                  rule.includeGlobs.some(glob => minimatch(prFile.filename, glob)) &&
                  !rule.excludeGlobs.some(glob => minimatch(prFile.filename, glob))
                )
              )) {
                labelsToAdd.add(label);
              }
            }

            const existingLabels = new Set((await github.rest.issues.listLabelsOnIssue({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
            })).data.map(l => l.name));

            labelsToAdd = [...labelsToAdd].filter(label => !existingLabels.has(label));

            if (labelsToAdd.length > 0) {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                labels: labelsToAdd,
              });
            }