# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# GitHub action job to test core java library features on
# downstream client libraries before they are released.
name: Hermetic library generation upon generation config change through pull requests
on:
  pull_request:

env:
  REPO_FULL_NAME: ${{ github.event.pull_request.head.repo.full_name }}
  GITHUB_REPOSITORY: ${{ github.repository }}
jobs:
  library_generation:
    runs-on: ubuntu-latest
    steps:
    - name: Determine whether the pull request comes from a fork
      run: |
        if [[ "${GITHUB_REPOSITORY}" != "${REPO_FULL_NAME}" ]]; then
          echo "This PR comes from a fork. Skip library generation."
          echo "SHOULD_RUN=false" >> $GITHUB_ENV
        else
          echo "SHOULD_RUN=true" >> $GITHUB_ENV
        fi
    - uses: actions/checkout@v6
      if: env.SHOULD_RUN == 'true'
      with:
        fetch-depth: 0
        token: ${{ secrets.CLOUD_JAVA_BOT_GITHUB_TOKEN }}
    - name: is applicable
      if: env.SHOULD_RUN == 'true' 
      env:
        # set our branch names to be the names in the "origin" remote since we aren't actually checking these branches out
        base_ref: origin/${{ github.base_ref }}
        head_ref: origin/${{ github.head_ref }}
      run: |
        #!/bin/bash -x
        
        # verify we have refs so error messages are clearer
        git rev-parse --verify "$base_ref"
        git rev-parse --verify "$head_ref"
        
        # list all paths that are changed between before and after
        changed_paths=$(git diff --name-only "$base_ref" "$head_ref")
        
        # define our array of paths that are included
        include_list=()
        
        # push our include regex values onto the array
        include_list+=("^.github/workflows/hermetic_library_generation.yaml$")
        include_list+=("^generation_config.yaml$")
        include_list+=("^.readme-partials.yaml$")
        include_list+=("^owlbot.py$")
        include_list+=("^versions.txt$")
        include_list+=("^.github/.OwlBot-hermetic.yaml$")
        
        # join all the paths into a single regex
        pattern="$(IFS=$'|' ; echo "${include_list[*]}")"
        
        # check if we have any paths that match our include list
        match=0
        echo -e "${changed_paths}" | grep -E "${pattern}" 2>&1 || match=1
        
        if [[ $match == 0 ]]; then
          echo "SHOULD_RUN=true" >> $GITHUB_ENV
        else
          echo "This PR does not match the include list"
          echo "SHOULD_RUN=false" >> $GITHUB_ENV
        fi

    - uses: googleapis/sdk-platform-java/.github/scripts@v2.67.0
      if: env.SHOULD_RUN == 'true'
      with:
        base_ref: ${{ github.base_ref }}
        head_ref: ${{ github.head_ref }}
        token: ${{ secrets.CLOUD_JAVA_BOT_GITHUB_TOKEN }}
