name: Awesome CI Workflow

on: [push, pull_request]
#   push:
#     branches: [ master ]
#   pull_request:
#     branches: [ master ]

jobs:
  MainSequence:
    name: Code Formatter
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1 # v2 is broken for git diff
      - uses: actions/setup-python@v2
      - name: requirements
        run: | 
          sudo apt -qq -y update
          sudo apt -qq install clang-tidy-10 clang-format-10
        # checks are passing with less errors when used with this version. 
        # The default installs v6.0 which did not work out well in my tests
      - name: Setup Git Specs
        run: |
          git config --global user.name github-actions
          git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
      - name: Filename Formatter
        run: |
          IFS=$'\n'
          for fname in `find . -type f -name '*.cpp' -o -name '*.cc' -o -name '*.h'`
          do 
            echo "${fname}"
            new_fname=`echo ${fname} | tr ' ' '_'`
            echo "      ${new_fname}"
            new_fname=`echo ${new_fname} | tr 'A-Z' 'a-z'`
            echo "      ${new_fname}"
            new_fname=`echo ${new_fname} | tr '-' '_'`
            echo "      ${new_fname}"
            new_fname=${new_fname/.cc/.cpp}
            echo "      ${new_fname}"
            if [ ${fname} != ${new_fname} ]
            then
              echo "      ${fname} --> ${new_fname}"
              git "mv" "${fname}" ${new_fname}
            fi
          done
          git commit -am "formatting filenames ${GITHUB_SHA::8}" ||  true

      - name: Update DIRECTORY.md
        run: |
          wget https://raw.githubusercontent.com/TheAlgorithms/scripts/main/build_directory_md.py
          python3 build_directory_md.py C-Plus-Plus . .cpp,.hpp,.h > DIRECTORY.md
          git commit -m "updating DIRECTORY.md" DIRECTORY.md ||  true
      - name: Get file changes
        run: |
          git remote -v
          git branch
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
          git diff --diff-filter=dr --name-only origin/master > git_diff.txt
          echo "Files changed-- `cat git_diff.txt`"
      - name: Configure for static lint checks
        # compiling first gives clang-tidy access to all the header files and settings used to compile the programs. 
        # This will check for macros, if any, on linux and not for Windows. But the use of portability checks should 
        # be able to catch any errors for other platforms.
        run: cmake -B build -S . -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
      - name: Lint modified files
        shell: python
        run: |
          import os
          import subprocess
          import sys

          print("Python {}.{}.{}".format(*sys.version_info))  # Python 3.8
          with open("git_diff.txt") as in_file:
            modified_files = sorted(in_file.read().splitlines())
          print("{} files were modified.".format(len(modified_files)))

          cpp_exts = tuple(".c .c++ .cc .cpp .cu .cuh .cxx .h .h++ .hh .hpp .hxx".split())
          cpp_files = [file for file in modified_files if file.lower().endswith(cpp_exts)]
          print(f"{len(cpp_files)} C++ files were modified.")
          if not cpp_files:
            sys.exit(0)

          subprocess.run(["clang-tidy-10", "--fix", "-p=build", "--extra-arg=-std=c++11", *cpp_files, "--"], 
              check=True, text=True, stderr=subprocess.STDOUT)

          subprocess.run(["clang-format-10", "-i", "-style=file", *cpp_files], 
              check=True, text=True, stderr=subprocess.STDOUT)

          upper_files = [file for file in cpp_files if file != file.lower()]
          if upper_files:
            print(f"{len(upper_files)} files contain uppercase characters:")
            print("\n".join(upper_files) + "\n")

          space_files = [file for file in cpp_files if " " in file or "-" in file]
          if space_files:
            print(f"{len(space_files)} files contain space or dash characters:")
            print("\n".join(space_files) + "\n")

          nodir_files = [file for file in cpp_files if file.count(os.sep) != 1]
          if nodir_files:
            print(f"{len(nodir_files)} files are not in one and only one directory:")
            print("\n".join(nodir_files) + "\n")

          bad_files = len(upper_files + space_files + nodir_files)
          if bad_files:
            sys.exit(bad_files)
      - name: Commit and push changes
        run: |
          git diff DIRECTORY.md
          git commit -am "clang-format and clang-tidy fixes for ${GITHUB_SHA::8}" ||  true
          git push --force origin HEAD:$GITHUB_REF || true

  build:
    name: Compile checks
    runs-on: ${{ matrix.os }}
    needs: [MainSequence]
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macOS-latest]
    steps:
      - uses: actions/checkout@master
        with:
          submodules: true
      - run: cmake -B ./build -S .
      - run: cmake --build build