name: "Go Workspace Check"

on:
  workflow_dispatch:
  pull_request:
    branches: [main]

permissions: {}

jobs:
  detect-changes:
    name: Detect whether code changed
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      changed: ${{ steps.detect-changes.outputs.backend }}
    steps:
      - uses: actions/checkout@v5
        with:
          persist-credentials: true # required to get more history in the changed-files action
          fetch-depth: 2
      - name: Detect changes
        id: detect-changes
        uses: ./.github/actions/change-detection
        with:
          self: .github/workflows/pr-go-workspace-check.yml

  check-workspace:
    needs: detect-changes
    if: needs.detect-changes.outputs.changed == 'true'
    name: Go Workspace Check
    runs-on: ubuntu-latest

    steps:
    - name: Checkout repository
      uses: actions/checkout@v5
      with:
        persist-credentials: false

    - name: Set go version
      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
      with:
        cache: false
        go-version-file: go.mod

    - name: Update workspace
      run: make update-workspace

    - name: Check for go mod & workspace changes 
      run: |
        if ! git diff --exit-code --quiet; then
          echo "Changes detected:"
          git diff
          echo "Please run 'make update-workspace' and commit the changes."
          echo "If there is a change in enterprise dependencies, please update pkg/extensions/main.go."
          exit 1
        fi
    - name: Ensure Dockerfile contains submodule COPY commands
      run: ./scripts/go-workspace/validate-dockerfile.sh

  check-wire:
    needs: detect-changes
    if: needs.detect-changes.outputs.changed == 'true'
    name: Check Wire Changes
    runs-on: ubuntu-latest

    permissions:
      contents: read
      id-token: write

    steps:
    - name: Checkout repository
      uses: actions/checkout@v5
      with:
        persist-credentials: false

    - name: Set go version
      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
      with:
        cache: false
        go-version-file: go.mod

    - name: Setup Enterprise
      if: github.event.pull_request.head.repo.fork == false
      uses: ./.github/actions/setup-enterprise

    - name: Calculate generated wire checksums
      id: pre_gen_oss
      run: |
        OSS_WIRE_CHECKSUM="$(sha256sum pkg/server/wire_gen.go | cut -d' ' -f1)"
        echo "wire_checksum=$OSS_WIRE_CHECKSUM" >> "$GITHUB_OUTPUT"

    - name: Calculate generated enterprise wire checksums
      id: pre_gen_enterprise
      if: github.event.pull_request.head.repo.fork == false
      run: |
        ENTERPRISE_WIRE_CHECKSUM="$(sha256sum pkg/server/enterprise_wire_gen.go | cut -d' ' -f1)"
        echo "wire_checksum=$ENTERPRISE_WIRE_CHECKSUM" >> "$GITHUB_OUTPUT"

    - name: Generate Go files
      run: make gen-go

    - name: Check for generated file changes
      run: |
        OSS_WIRE_CHANGED=false
        CURRENT_OSS_WIRE_CHECKSUM=$(sha256sum pkg/server/wire_gen.go | cut -d' ' -f1)
        if [ "$CURRENT_OSS_WIRE_CHECKSUM" != "${{ steps.pre_gen_oss.outputs.wire_checksum }}" ]; then
          OSS_WIRE_CHANGED=true
          OSS_DIFF=$(git diff pkg/server/wire_gen.go)
          echo "Uncomitted changes detected in pkg/server/wire_gen.go"
        fi

        ENTERPRISE_WIRE_CHANGED=false
        if [ -f "pkg/server/enterprise_wire_gen.go" ]; then
          CURRENT_ENTERPRISE_WIRE_CHECKSUM=$(sha256sum pkg/server/enterprise_wire_gen.go | cut -d' ' -f1)
          if [ "$CURRENT_ENTERPRISE_WIRE_CHECKSUM" != "${{ steps.pre_gen_enterprise.outputs.wire_checksum }}" ]; then
            ENTERPRISE_WIRE_CHANGED=true
            ENTERPRISE_DIFF=$(git diff pkg/server/enterprise_wire_gen.go)
            echo "Uncomitted changes detected in pkg/server/enterprise_wire_gen.go"
          fi
        fi
        
        if [ "$OSS_WIRE_CHANGED" = "false" ] && [ "$ENTERPRISE_WIRE_CHANGED" = "false" ]; then
          echo "No changes in generated Go files"
        else
          if [[ "${{ github.event.pull_request.head.repo.fork }}" == "false" ]]; then
            echo "> !!! Please synchronize the grafana OSS and grafana enterprise code bases as defined in the enterprise readme, then run 'make gen-go' in the OSS folder and commit the changes to both repositories."
            if [[ "$OSS_WIRE_CHANGED" == "true" ]]; then
              echo "OSS changes:"
              echo "$OSS_DIFF"
            fi
            if [[ "$ENTERPRISE_WIRE_CHANGED" == "true" ]]; then
              echo "Enterprise changes:"
              echo "$ENTERPRISE_DIFF"
            fi
          else
            echo "> !!! Please run 'make gen-go' and commit the changes."
          fi
          exit 1
        fi

  # This is the job that is actually required by rulesets.
  # We want to only require one job instead of all the individual tests.
  # Future work also allows us to start skipping some tests based on changed files.
  required-go-workspace-check:
    needs:
      - check-workspace
      - check-wire
    # always() is the best function here.
    # success() || failure() will skip this function if any need is also skipped.
    # That means conditional jobs will fail the entire requirement check.
    if: always()

    name: All Go Workspace Checks complete
    runs-on: ubuntu-latest
    steps:
      - name: Check the checks
        env:
          NEEDS: ${{ toJson(needs) }}
        run: |
          FAILURES="$(echo "$NEEDS" | jq 'with_entries(select(.value.result == "failure")) | map_values(.result)')"
          echo "$FAILURES"
          if [ "$(echo "$FAILURES" | jq '. | length')" != "0" ]; then
            exit 1
          fi
          echo "All OK!"