name: Check Duplicate Issues

on:
  issues:
    types: [opened]

jobs:
  check-duplicates:
    if: github.event.action == 'opened'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - name: Install opencode
        run: curl -fsSL https://opencode.ai/install | bash

      - name: Check duplicates
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          OPENCODE_PERMISSION: |
            {
              "bash": {
                "*": "deny",
                "gh issue*": "allow"
              },
              "webfetch": "deny"
            }
        run: |
          opencode run -m anthropic/claude-sonnet-4-6 "A new issue has been created:

          Issue number: ${{ github.event.issue.number }}

          Lookup this issue with gh issue view ${{ github.event.issue.number }}.

          Search through existing issues (excluding #${{ github.event.issue.number }}) to find potential duplicates.

          Use gh issue list with relevant search terms from the new issue's title and description. Try multiple keyword combinations to search broadly. Check both open and recently closed issues.

          Consider:
          1. Similar titles or descriptions
          2. Same error messages or symptoms
          3. Related functionality or components
          4. Similar feature requests

          If you find potential duplicates, post a SINGLE comment on issue #${{ github.event.issue.number }} using this format:

          This issue might be a duplicate of existing issues. Please check:
          - #[issue_number]: [brief description of similarity]

          If you find NO duplicates, do NOT post any comment. Stay silent."