name: Poll llama.cpp and Trigger Docker Build

on:
  schedule:
    - cron: '*/30 * * * *'  # Every 30 minutes
  workflow_dispatch:

jobs:
  poll-and-trigger:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout (needed for artifact access)
        uses: actions/checkout@v4

      - name: Get latest commit from llama.cpp/main
        id: fetch
        run: |
          echo "🔍 Fetching latest commit SHA from llama.cpp..."
          LATEST_SHA=$(curl -s https://api.github.com/repos/ggml-org/llama.cpp/commits/main | jq -r .sha)
          echo "✅ Latest SHA: $LATEST_SHA"
          echo "latest_sha=$LATEST_SHA" >> $GITHUB_OUTPUT

      - name: Download last known SHA artifact
        uses: actions/download-artifact@v4
        with:
          name: last-llama-sha
        continue-on-error: true

      - name: Read last known SHA
        id: last
        run: |
          if [[ -f .last_commit_sha ]]; then
            LAST_SHA=$(cat .last_commit_sha)
            echo "📦 Found previous SHA: $LAST_SHA"
            echo "last_sha=$LAST_SHA" >> $GITHUB_OUTPUT
          else
            echo "⚠️ No previous SHA found (first run or artifact missing)"
            echo "last_sha=" >> $GITHUB_OUTPUT
          fi

      - name: Compare SHAs
        id: compare
        run: |
          echo "🧮 Comparing SHAs..."
          echo "Previous: ${{ steps.last.outputs.last_sha }}"
          echo "Current:  ${{ steps.fetch.outputs.latest_sha }}"
          if [[ "${{ steps.fetch.outputs.latest_sha }}" != "${{ steps.last.outputs.last_sha }}" ]]; then
            echo "🔁 Detected new commit. Triggering build workflow."
            echo "changed=true" >> $GITHUB_OUTPUT
          else
            echo "✅ No changes detected. Skipping trigger."
            echo "changed=false" >> $GITHUB_OUTPUT
          fi

      - name: Trigger Build & Publish Workflow
        if: steps.compare.outputs.changed == 'true'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo "🚀 Sending workflow_dispatch event to trigger Docker build..."
          curl -X POST https://api.github.com/repos/${{ github.repository }}/actions/workflows/build-publish-strix.yml/dispatches \
            -H "Accept: application/vnd.github+json" \
            -H "Authorization: Bearer $GH_TOKEN" \
            -d '{"ref":"main","inputs":{"backends":"all"}}'

      - name: Save latest SHA to file
        if: steps.compare.outputs.changed == 'true'
        run: echo "${{ steps.fetch.outputs.latest_sha }}" > .last_commit_sha

      - name: Upload updated SHA artifact
        if: steps.compare.outputs.changed == 'true'
        uses: actions/upload-artifact@v4
        with:
          name: last-llama-sha
          path: .last_commit_sha
          retention-days: 2