name: Awesome CI Workflow
on: [push, pull_request]
permissions:
  contents: write

jobs:
  MainSequence:
    name: Code Formatter
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - uses: actions/setup-python@v4
      - name: requirements
        run: |
          sudo apt-get -qq update
          sudo apt-get -qq install clang-tidy clang-format
        # 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[bot]
          git config --global user.email 'github-actions@users.noreply.github.com'
      - name: Filename Formatter
        uses: TheAlgorithms/scripts/formatter@main
        with:
          filetypes: .c,.h
      - name: Update DIRECTORY.md
        run: |
          wget https://raw.githubusercontent.com/TheAlgorithms/scripts/main/build_directory_md.py
          python3 build_directory_md.py C . .c,.h leetcode/ > DIRECTORY.md
          git commit -m "updating DIRECTORY.md" DIRECTORY.md || true
      - name: Get file changes
        run: |
          git branch
          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", "-p=build", "--fix", *cpp_files, "--"],
                check=True, text=True, stderr=subprocess.STDOUT)
            subprocess.run(["clang-format", "-i", *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 and "project_euler" not in file and "data_structure" not in file]
          if len(nodir_files) > 1:            
            nodir_file_bad_files = len(nodir_files) - 1
            print(f"{len(nodir_files)} files are not in one and only one directory:")
            print("\n".join(nodir_files) + "\n")
          else:
            nodir_file_bad_files = 0
            
          bad_files = nodir_file_bad_files + len(upper_files + space_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 ${GITHUB_SHA::8}" || true
          git push origin HEAD:$GITHUB_REF || true
  build:
    name: Compile checks
    runs-on: ${{ matrix.os }}
    needs: [MainSequence]
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest]
    steps:
      - uses: actions/checkout@v3
        with:
          submodules: true
      - run: cmake -B ./build -S .
      - run: cmake --build build