name: Nix build and commit

on:
  pull_request:
    types: [opened, synchronize, reopened]
  workflow_dispatch:

permissions:
  contents: write

jobs:
  check-commit:
    runs-on: ubuntu-latest
    outputs:
      skip: ${{ steps.check.outputs.skip }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - id: check
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            msg=$(git log -1 --pretty=%B "${{ github.event.pull_request.head.sha }}")
          else
            msg="manual dispatch"
          fi
          echo "Commit message: $msg"
          if echo "$msg" | grep -q '\[skip-build\]'; then
            echo "skip=true" >> "$GITHUB_OUTPUT"
          else
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

  build_and_commit:
    needs: check-commit
    if: needs.check-commit.outputs.skip == 'false'
    runs-on: docker-builder-01
    steps:
      - name: Show disk usage
        run: df -h

      - name: Notify build start on Slack
        id: slack_start
        run: |
          msg="*Build started* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
          response=$(curl -s -X POST \
            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
            -H "Content-type: application/json; charset=utf-8" \
            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\"}" \
            https://slack.com/api/chat.postMessage)
          ts=$(echo "$response" | jq -r '.ts')
          echo "thread_ts=$ts" >> "$GITHUB_OUTPUT"
          echo "$response"

      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          lfs: true
          ref: ${{ github.head_ref || github.ref }}

      - name: Install Nix
        uses: cachix/install-nix-action@v31

      - name: Setup huggingface cachix
        uses: cachix/cachix-action@v15
        with:
          name: huggingface

      - name: Clean build directory
        run: |
          rm -rf build

      - name: Build with Nix
        run: |
            nix run .#build-and-copy \
                --override-input kernel-builder github:huggingface/kernel-builder \
                --max-jobs 8 \
                -j 8 \
                -L

      - name: List built binaries
        run: |
          ls build

      - name: Commit build artifact
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add build/*
          git commit -m "Add built binary [skip-build]"

      - name: Push changes
        run: |
          git push origin HEAD:"$HEAD_REF"
        env:
          HEAD_REF: ${{ github.head_ref || github.ref }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Notify success on Slack (thread)
        if: success()
        run: |
          ts="${{ steps.slack_start.outputs.thread_ts }}"
          msg="*Build succeeded* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
          curl -s -X POST \
            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
            -H "Content-type: application/json; charset=utf-8" \
            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\",\"thread_ts\":\"$ts\"}" \
            https://slack.com/api/chat.postMessage

      - name: Notify failure on Slack (thread)
        if: failure()
        run: |
          ts="${{ steps.slack_start.outputs.thread_ts }}"
          msg="*Build failed* for \`${{ github.repository }}\`\nBranch: \`${{ github.ref_name }}\`\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Workflow>"
          curl -s -X POST \
            -H "Authorization: Bearer ${{ secrets.SLACK_TOKEN }}" \
            -H "Content-type: application/json; charset=utf-8" \
            --data "{\"channel\":\"${{ secrets.SLACK_CHANNEL_ID }}\",\"text\":\"$msg\",\"thread_ts\":\"$ts\"}" \
            https://slack.com/api/chat.postMessage