name: Check for webkit2gtk update

on:
  # schedule:
    # Run every hour
    # - cron: '0 * * * *'
  workflow_dispatch:

jobs:
  check:
    name: Poll AUR for new version
    runs-on: ubuntu-latest
    permissions:
      contents: read
      actions: write   # required to trigger workflow_dispatch on build.yml

    steps:
      - name: Fetch latest AUR version
        id: aur
        run: |
          response=$(curl -fsSL "https://aur.archlinux.org/rpc/v5/info/webkit2gtk")
          aur_version=$(echo "${response}" | jq -r '.results[0].Version')
          if [[ -z "${aur_version}" || "${aur_version}" == "null" ]]; then
            echo "ERROR: Failed to parse version from AUR response: ${response}" >&2
            exit 1
          fi
          echo "AUR version: ${aur_version}"
          echo "version=${aur_version}" >> "$GITHUB_OUTPUT"

      - name: Fetch last published version from GitHub Releases
        id: last
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          # Get the tag of the latest release; strip the leading 'v'
          tag=$(gh release list \
            --repo "${{ github.repository }}" \
            --limit 1 \
            --json tagName \
            --jq '.[0].tagName // ""')
          last_version="${tag#v}"
          echo "Last published version: ${last_version:-<none>}"
          echo "version=${last_version}" >> "$GITHUB_OUTPUT"

      - name: Decide whether to build
        id: decision
        run: |
          aur="${{ steps.aur.outputs.version }}"
          last="${{ steps.last.outputs.version }}"
          if [[ "${aur}" == "${last}" ]]; then
            echo "Already up to date (${aur}), nothing to do"
            echo "should_build=false" >> "$GITHUB_OUTPUT"
          else
            echo "New version detected: ${aur} (was: ${last:-<none>})"
            echo "should_build=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Trigger build workflow
        if: steps.decision.outputs.should_build == 'true'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          gh workflow run build.yml \
            --repo "${{ github.repository }}" \
            --field aur_version="${{ steps.aur.outputs.version }}"
          echo "Dispatched build.yml for version ${{ steps.aur.outputs.version }}"