name: Duplicate Issue Detection

on:
  issues:
    types: [opened]

jobs:
  check-duplicates:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      - name: Install opencode
        run: curl -fsSL https://opencode.ai/install | bash

      - name: Check for duplicate issues
        env:
          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          OPENCODE_PERMISSION: |
            {
              "bash": {
                "gh issue*": "allow",
                "*": "deny"
              },
              "webfetch": "deny"
            }
        run: |
          opencode run -m opencode/claude-haiku-4-5 "A new issue has been created:'

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

          Lookup this issue and search through existing issues (excluding #${{ github.event.issue.number }}) in this repository to find any potential duplicates of this new issue.
          Consider:
          1. Similar titles or descriptions
          2. Same error messages or symptoms
          3. Related functionality or components
          4. Similar feature requests

          If you find any potential duplicates, please comment on the new issue with:
          - A brief explanation of why it might be a duplicate
          - Links to the potentially duplicate issues
          - A suggestion to check those issues first

          Use this format for the comment:
          'This issue might be a duplicate of existing issues. Please check:
          - #[issue_number]: [brief description of similarity]

          Feel free to ignore if none of these address your specific case.'

          If no clear duplicates are found, do not comment."
