name: Auto Label Issues

on:
  issues:
    types: [opened, edited]

permissions:
  issues: write

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - name: Auto-label based on content
        uses: actions/github-script@v7
        with:
          script: |
            const issue = context.payload.issue;
            const title = issue.title.toLowerCase();
            const body = (issue.body || '').toLowerCase();
            const content = title + ' ' + body;

            const labelsToAdd = [];

            // Type labels based on title prefix
            if (title.includes('[bug]')) {
              labelsToAdd.push('bug');
            } else if (title.includes('[feature]') || title.includes('feat(') || title.includes('feat:')) {
              labelsToAdd.push('enhancement');
            } else if (title.includes('[docs]') || title.includes('docs(') || title.includes('docs:')) {
              labelsToAdd.push('documentation');
            }

            // Project labels based on content
            if (content.includes('core dev') || content.includes('core work') || content.includes('core commit') || content.includes('core push')) {
              labelsToAdd.push('project:core-cli');
            }
            if (content.includes('core php') || content.includes('composer') || content.includes('pest') || content.includes('phpstan')) {
              labelsToAdd.push('project:core-php');
            }
            if (content.includes('setup') || content.includes('install') || content.includes('makefile')) {
              labelsToAdd.push('project:workstation');
            }

            // Priority detection
            if (content.includes('critical') || content.includes('urgent') || content.includes('breaking')) {
              labelsToAdd.push('priority:high');
            }

            // Agent labels
            if (content.includes('agent') || content.includes('ai ') || content.includes('claude') || content.includes('agentic')) {
              labelsToAdd.push('agentic');
            }

            // Complexity - from template dropdown or heuristics
            if (body.includes('small - quick fix')) {
              labelsToAdd.push('complexity:small');
              labelsToAdd.push('good first issue');
            } else if (body.includes('medium - multiple files')) {
              labelsToAdd.push('complexity:medium');
            } else if (body.includes('large - significant')) {
              labelsToAdd.push('complexity:large');
            } else if (!body.includes('unknown - not sure')) {
              // Heuristic complexity detection
              const checklistCount = (body.match(/- \[ \]/g) || []).length;
              const codeBlocks = (body.match(/```/g) || []).length / 2;
              const sections = (body.match(/^##/gm) || []).length;
              const fileRefs = (body.match(/\.(go|php|js|ts|yml|yaml|json|md)\b/g) || []).length;

              const complexKeywords = ['refactor', 'rewrite', 'migration', 'breaking change', 'across repos', 'architecture'];
              const simpleKeywords = ['simple', 'quick fix', 'typo', 'minor', 'trivial'];

              const hasComplexKeyword = complexKeywords.some(k => content.includes(k));
              const hasSimpleKeyword = simpleKeywords.some(k => content.includes(k));

              let score = checklistCount * 2 + codeBlocks + sections + fileRefs;
              score += hasComplexKeyword ? 5 : 0;
              score -= hasSimpleKeyword ? 3 : 0;

              if (hasSimpleKeyword || score <= 2) {
                labelsToAdd.push('complexity:small');
                labelsToAdd.push('good first issue');
              } else if (score <= 6) {
                labelsToAdd.push('complexity:medium');
              } else {
                labelsToAdd.push('complexity:large');
              }
            }

            // Apply labels if any detected
            if (labelsToAdd.length > 0) {
              // Filter to only existing labels
              const existingLabels = await github.rest.issues.listLabelsForRepo({
                owner: context.repo.owner,
                repo: context.repo.repo,
                per_page: 100
              });
              const validLabels = existingLabels.data.map(l => l.name);
              const filteredLabels = labelsToAdd.filter(l => validLabels.includes(l));

              if (filteredLabels.length > 0) {
                await github.rest.issues.addLabels({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: issue.number,
                  labels: filteredLabels
                });
                console.log(`Added labels: ${filteredLabels.join(', ')}`);
              }
            }