name: Check Links

on:
  schedule:
    - cron: '0 0 * * 1'  # Weekly on Monday
  workflow_dispatch:
  pull_request:
    paths: ['README.md']

jobs:
  link-check:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
      pull-requests: write
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Link Checker
        uses: lycheeverse/lychee-action@v2.0.2
        with:
          args: --verbose --no-progress README.md
          fail: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create Issue for Broken Links
        if: failure() && github.event_name == 'schedule'
        uses: actions/github-script@v6
        with:
          script: |
            const date = new Date().toISOString().split('T')[0];
            github.rest.issues.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: `🔗 Broken Links Found - ${date}`,
              body: `Automated link checking found broken links in the repository.
              
              Please check the workflow logs for details: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
              
              ---
              *This issue was automatically created by the link checker workflow.*`,
              labels: ['maintenance', 'broken-links']
            });

      - name: Comment on PR if links are broken
        if: failure() && github.event_name == 'pull_request'
        uses: actions/github-script@v6
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: `⚠️ **Link Check Failed**
              
              Some links in your changes appear to be broken or inaccessible. Please check the workflow logs and fix any broken links before merging.
              
              **How to check locally:**
              \`\`\`bash
              pip install lychee
              lychee README.md
              \`\`\`
              
              *This comment was automatically generated by the link checker.*`
            });