name: Test Coverage
on:
  pull_request:
  push:
    branches:
      - master
      - release/**

jobs:
  split-test-files:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Create a file with all the pkgs
        run: go list ./... > pkgs.txt
      - name: Split pkgs into 4 files
        run: split -d -n l/4 pkgs.txt pkgs.txt.part.
      # cache multiple
      - uses: actions/upload-artifact@v2
        with:
          name: "${{ github.sha }}-00"
          path: ./pkgs.txt.part.00
      - uses: actions/upload-artifact@v2
        with:
          name: "${{ github.sha }}-01"
          path: ./pkgs.txt.part.01
      - uses: actions/upload-artifact@v2
        with:
          name: "${{ github.sha }}-02"
          path: ./pkgs.txt.part.02
      - uses: actions/upload-artifact@v2
        with:
          name: "${{ github.sha }}-03"
          path: ./pkgs.txt.part.03

  tests:
    runs-on: ubuntu-latest
    needs: split-test-files
    strategy:
      fail-fast: false
      matrix:
        part: ["00", "01", "02", "03"]
    steps:
      - uses: actions/setup-go@v2
        with:
          go-version: '^1.15.4'
      - uses: actions/checkout@v2
      - uses: technote-space/get-diff-action@v4
        with:
          PATTERNS: |
            **/**.go
            go.mod
            go.sum
      - uses: actions/download-artifact@v2
        with:
          name: "${{ github.sha }}-${{ matrix.part }}"
        if: env.GIT_DIFF
      - name: test & coverage report creation
        run: |
          cat pkgs.txt.part.${{ matrix.part }} | xargs go test -mod=readonly -timeout 8m -race -coverprofile=${{ matrix.part }}profile.out -covermode=atomic
        if: env.GIT_DIFF
      - uses: actions/upload-artifact@v2
        with:
          name: "${{ github.sha }}-${{ matrix.part }}-coverage"
          path: ./${{ matrix.part }}profile.out

  upload-coverage-report:
    runs-on: ubuntu-latest
    needs: tests
    steps:
      - uses: actions/checkout@v2
      - uses: technote-space/get-diff-action@v4
        with:
          PATTERNS: |
            **/**.go
            go.mod
            go.sum
      - uses: actions/download-artifact@v2
        with:
          name: "${{ github.sha }}-00-coverage"
        if: env.GIT_DIFF
      - uses: actions/download-artifact@v2
        with:
          name: "${{ github.sha }}-01-coverage"
        if: env.GIT_DIFF
      - uses: actions/download-artifact@v2
        with:
          name: "${{ github.sha }}-02-coverage"
        if: env.GIT_DIFF
      - uses: actions/download-artifact@v2
        with:
          name: "${{ github.sha }}-03-coverage"
        if: env.GIT_DIFF
      - run: |
          cat ./*profile.out | grep -v "mode: atomic" >> coverage.txt
        if: env.GIT_DIFF
      - uses: codecov/codecov-action@v1.0.13
        with:
          file: ./coverage.txt
        if: env.GIT_DIFF