name: Check for Updates

on:
  schedule:
    - cron: '0 * * * *'
  workflow_dispatch:
    inputs:
      version:
        description: 'Specific version to update to (optional)'
        required: false

permissions:
  contents: write
  pull-requests: write

jobs:
  check-update:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        token: ${{ secrets.GITHUB_TOKEN }}

    - uses: cachix/install-nix-action@v27
      with:
        nix_path: nixpkgs=channel:nixos-unstable
        extra_nix_config: |
          experimental-features = nix-command flakes

    - name: Check for new version
      id: check
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        CURRENT_VERSION=$(grep 'version = ' package.nix | cut -d'"' -f2 | head -1)
        echo "Current version: $CURRENT_VERSION"

        if [ -n "${{ github.event.inputs.version }}" ]; then
          LATEST_VERSION="${{ github.event.inputs.version }}"
        else
          # Get latest version from GitHub releases (strip rust-v prefix)
          LATEST_VERSION=$(gh release view --repo openai/codex --json tagName -q '.tagName' | sed 's/^rust-v//' || echo "")
        fi

        if [ -z "$LATEST_VERSION" ]; then
          echo "Could not fetch latest version"
          exit 0
        fi

        echo "Latest version: $LATEST_VERSION"

        if [ "$CURRENT_VERSION" != "$LATEST_VERSION" ]; then
          echo "new_version=$LATEST_VERSION" >> $GITHUB_OUTPUT
          echo "current_version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
          echo "update_needed=true" >> $GITHUB_OUTPUT
        else
          echo "update_needed=false" >> $GITHUB_OUTPUT
        fi

    - name: Update version
      if: steps.check.outputs.update_needed == 'true'
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        NEW_VERSION="${{ steps.check.outputs.new_version }}"
        ./scripts/update.sh --version "$NEW_VERSION"

    - name: Create Pull Request
      if: steps.check.outputs.update_needed == 'true'
      id: create-pr
      uses: peter-evans/create-pull-request@v6
      with:
        token: ${{ secrets.GITHUB_TOKEN }}
        commit-message: "chore: update codex to version ${{ steps.check.outputs.new_version }}"
        title: "chore: update codex to version ${{ steps.check.outputs.new_version }}"
        body: |
          ## Update Codex

          This PR updates Codex from version ${{ steps.check.outputs.current_version }} to ${{ steps.check.outputs.new_version }}.

          ### Changes
          - Updated `version` in `package.nix`
          - Updated native binary hashes for all platforms
          - Updated npm tarball hash

          ### Checklist
          - [ ] Build passes
          - [ ] Basic functionality tested

          ---
          *This PR was automatically generated by the update workflow.*
        branch: update-codex-${{ steps.check.outputs.new_version }}
        delete-branch: true
        labels: |
          dependencies
          automated

    - name: Enable Auto-Merge
      if: steps.check.outputs.update_needed == 'true' && steps.create-pr.outputs.pull-request-number
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        gh pr merge ${{ steps.create-pr.outputs.pull-request-number }} --auto --squash --delete-branch

    - name: Summary
      if: always()
      run: |
        echo "## Update Summary" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY

        if [ "${{ steps.check.outputs.update_needed }}" == "true" ]; then
          echo "- **Current Version:** ${{ steps.check.outputs.current_version }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Latest Version:** ${{ steps.check.outputs.new_version }}" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ Pull request created for version update with auto-merge enabled!" >> $GITHUB_STEP_SUMMARY
        else
          CURRENT_VERSION=$(grep 'version = ' package.nix | cut -d'"' -f2 | head -1)
          echo "- **Current Version:** $CURRENT_VERSION" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ Already up to date!" >> $GITHUB_STEP_SUMMARY
        fi