# @license Apache-2.0
#
# Copyright (c) 2020 The Stdlib Authors.
#
# 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.

# A `.gyp` file for building a Node.js native add-on.
#
# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md
# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md
{
  # List of files to include in this file:
  'includes': [
    './include.gypi',
  ],

  # Define variables to be used throughout the configuration for all targets:
  'variables': {
    # Target name should match the add-on export name:
    'addon_target_name%': 'addon',

    # Set variables based on the host OS:
    'conditions': [
      [
        'OS=="win"',
        {
          # Define the object file suffix:
          'obj': 'obj',
        },
        {
          # Define the object file suffix:
          'obj': 'o',
        }
      ], # end condition (OS=="win")
    ], # end conditions
  }, # end variables

  # Define compile targets:
  'targets': [

    # Target to generate an add-on:
    {
      # The target name should match the add-on export name:
      'target_name': '<(addon_target_name)',

      # Define dependencies:
      'dependencies': [],

      # Define directories which contain relevant include headers:
      'include_dirs': [
        # Local include directory:
        '<@(include_dirs)',
      ],

      # List of source files:
      'sources': [
        '<@(src_files)',
      ],

      # Settings which should be applied when a target's object files are used as linker input:
      'link_settings': {
        # Define libraries:
        'libraries': [
          '<@(libraries)',
        ],

        # Define library directories:
        'library_dirs': [
          '<@(library_dirs)',
        ],
      },

      # C/C++ compiler flags:
      'cflags': [
        # Enable commonly used warning options:
        '-Wall',

        # Aggressive optimization:
        '-O3',
      ],

      # C specific compiler flags:
      'cflags_c': [
        # Specify the C standard to which a program is expected to conform:
        '-std=c99'
      ],

      # C++ specific compiler flags:
      'cflags_cpp': [
        # Specify the C++ standard to which a program is expected to conform:
        '-std=c++11'
      ],

      # Linker flags:
      'ldflags': [],

      # Apply conditions based on the host OS:
      'conditions': [
        [
          'OS=="mac"',
          {
            # Linker flags:
            'ldflags': [
              '-undefined dynamic_lookup',
              '-Wl,-no-pie',
              '-Wl,-search_paths_first',
            ],
          },
        ], # end condition (OS=="mac")
        [
          'OS!="win"',
          {
            # C/C++ flags:
            'cflags': [
              # Generate platform-independent code:
              '-fPIC',
            ],
          },
        ], # end condition (OS!="win")
      ], # end conditions
    }, # end target <(addon_target_name)

    # Target to copy a generated add-on to a standard location:
    {
      'target_name': 'copy_addon',

      # Declare that the output of this target is not linked:
      'type': 'none',

      # Define dependencies:
      'dependencies': [
        # Require that the add-on be generated before building this target:
        '<(addon_target_name)',
      ],

      # Define a list of actions:
      'actions': [
        {
          'action_name': 'copy_addon',
          'message': 'Copying addon...',

          # Explicitly list the inputs in the command-line invocation below:
          'inputs': [],

          # Declare the expected outputs:
          'outputs': [
            '<(addon_output_dir)/<(addon_target_name).node',
          ],

          # Define the command-line invocation:
          'action': [
            'cp',
            '<(PRODUCT_DIR)/<(addon_target_name).node',
            '<(addon_output_dir)/<(addon_target_name).node',
          ],
        },
      ], # end actions
    }, # end target copy_addon
  ], # end targets
}