name: Affected Go Tests

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

permissions:
  contents: read

jobs:
  test-affected:
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-latest
    timeout-minutes: 30
    outputs:
      unit_has_changes: ${{ steps.affected.outputs.has_changes }}
      e2e_has_changes: ${{ steps.affected_e2e.outputs.has_changes }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Go Mod Download
        run: go mod download


      - name: Compute base ref
        id: pr-info
        run: |
          echo "BASE_REF=origin/${{ github.base_ref }}" >> "$GITHUB_OUTPUT"
          echo "Base ref: origin/${{ github.base_ref }}"

      # 2) Detect relevant unit packages and e2e tests
      - name: Compute affected packages
        id: affected
        run: |
          set -euo pipefail
          echo "Base: ${{ steps.pr-info.outputs.BASE_REF }}"
          # Generate affected package list to a file for reuse in subsequent steps
          go run ./scripts/affected-packages.go -base "${{ steps.pr-info.outputs.BASE_REF }}" > /tmp/affected.txt
          echo "Affected packages:" || true
          if [ -s /tmp/affected.txt ]; then
            cat /tmp/affected.txt
          else
            echo "(none)"
          fi
          # Expose whether we have any packages to test
          if [ -s /tmp/affected.txt ]; then
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
          else
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Compute affected e2e tests
        id: affected_e2e
        run: |
          set -euo pipefail
          go run ./scripts/affected-packages.go -mode=suites -base "${{ steps.pr-info.outputs.BASE_REF }}" > /tmp/affected-e2e.txt
          awk -F: '$1=="preflight"{print $2}' /tmp/affected-e2e.txt > /tmp/preflight-tests.txt
          awk -F: '$1=="support-bundle"{print $2}' /tmp/affected-e2e.txt > /tmp/support-tests.txt
          if [ -s /tmp/preflight-tests.txt ] || [ -s /tmp/support-tests.txt ]; then
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
          else
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Publish affected summary
        if: always()
        run: |
          {
            echo "### Affected unit packages";
            if [ -s /tmp/affected.txt ]; then
              sed 's/^/- /' /tmp/affected.txt;
            else
              echo "- (none)";
            fi;
            echo;
            echo "### Affected e2e tests";
            if [ -s /tmp/affected-e2e.txt ]; then
              sed 's/^/- /' /tmp/affected-e2e.txt;
            else
              echo "- (none)";
            fi;
          } | tee -a "$GITHUB_STEP_SUMMARY"

      - name: Upload affected unit packages
        uses: actions/upload-artifact@v4
        with:
          name: affected-unit
          path: /tmp/affected.txt
          if-no-files-found: warn

      - name: Upload affected e2e artifacts
        uses: actions/upload-artifact@v4
        with:
          name: affected-e2e
          path: |
            /tmp/affected-e2e.txt
            /tmp/preflight-tests.txt
            /tmp/support-tests.txt
          if-no-files-found: warn


      - name: No affected packages — skip tests
        if: steps.affected.outputs.has_changes != 'true'
        run: echo "No Go packages affected by this PR; skipping tests."

  e2e-affected:
    needs: test-affected
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-latest
    timeout-minutes: 45
    strategy:
      fail-fast: false
      matrix:
        suite: [unit, preflight, support-bundle]
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Go Mod Download
        run: go mod download

      - name: Download affected unit packages
        uses: actions/download-artifact@v4
        with:
          name: affected-unit
          path: /tmp

      - name: Download affected e2e artifacts
        uses: actions/download-artifact@v4
        with:
          name: affected-e2e
          path: /tmp

      - name: Run unit tests (filtered)
        if: matrix.suite == 'unit' && needs.test-affected.outputs.unit_has_changes == 'true'
        run: |
          set -euo pipefail
          if grep -qx "./..." /tmp/affected.txt; then
            echo "Module files changed; running all unit tests"
            make test
          else
            echo "Running unit tests for affected packages"
            pkgs=$(tr '\n' ' ' < /tmp/affected.txt)
            PACKAGES="$pkgs" make test-packages
          fi


      - name: Run e2e (filtered) - ${{ matrix.suite }}
        if: matrix.suite != 'unit' && needs.test-affected.outputs.e2e_has_changes == 'true'
        run: |
          set -euo pipefail
          docker rm -f kind-cluster-control-plane 2>/dev/null || true
          if [ "${{ matrix.suite }}" = "preflight" ]; then
            file=/tmp/preflight-tests.txt
            path=./test/e2e/preflight
          else
            file=/tmp/support-tests.txt
            path=./test/e2e/support-bundle
          fi
          if [ -s "$file" ]; then
            regex="$(grep -v '^$' "$file" | tr '\n' '|' | sed 's/|$//')"
            if [ -n "$regex" ]; then
              if [ "${{ matrix.suite }}" = "preflight" ]; then
                E2EPATHS="$path" RUN="^(${regex})$" make preflight-e2e-go-test
              else
                E2EPATHS="$path" RUN="^(${regex})$" make support-bundle-e2e-go-test
              fi
            else
              echo "No valid ${{ matrix.suite }} tests matched after filtering"
            fi
          else
            echo "No ${{ matrix.suite }} e2e changes"
          fi