# Copyright (c) 2021 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

require 'fileutils'
unless find_header('funchook.h', ext_path)

  FUNCHOOK_DIR_NAME = 'funchook'
  FUNCHOOK_DIR = File.expand_path(File.join(File.dirname(File.expand_path(__FILE__)), '..', FUNCHOOK_DIR_NAME))

  COMMANDS = ['./autogen.sh', './configure', 'make clean', 'make'].freeze
  bundler_install_target_paths = []

  # .path and .paths diverge in their return type - .path returns strings, .paths returns PathSupports
  possible_gem_paths = Gem.path
  possible_gem_paths.each do |base_path|
    contrast_gem_dir_search = File.join(base_path, 'extensions', '**', '*', 'contrast-agent-*')
    extension_paths = Dir[contrast_gem_dir_search]
    extension_paths.map! do |extension_path|
      target_path = File.join(extension_path, 'shared_libraries')
      FileUtils.mkdir_p(target_path) unless File.exist?(target_path)
      target_path
    end
    bundler_install_target_paths += extension_paths
  end

  puts 'Building funchook'
  COMMANDS.each do |command|
    puts "executing: #{ command } in #{ FUNCHOOK_DIR }"
    Dir.chdir(FUNCHOOK_DIR) do
      `#{ command }`
    end
  end

  SOURCE_PATHS = [
    File.join('include', 'funchook.h'), File.join('src', 'libfunchook.dylib'),
    File.join('src', 'libfunchook.so')
  ].freeze

  TARGET_PATHS = ([
    File.expand_path(File.join(File.expand_path(__dir__), '..', 'shared_libraries')),
    File.expand_path(__dir__)
  ] + bundler_install_target_paths).freeze

  puts 'Copying required files'

  SOURCE_PATHS.each do |source_file|
    source_file_path = File.join(FUNCHOOK_DIR, source_file)
    unless File.exist?(source_file_path)
      puts "Skipping #{ source_file_path }, file doesn't exist"
      next
    end

    TARGET_PATHS.each do |target_path|
      unless File.writable?(target_path)
        puts "Unable to copy into #{ target_path } - directory not writable"
        next
      end
      puts "Copying #{ source_file_path } into #{ target_path }"
      FileUtils.cp(source_file_path, target_path)
    rescue StandardError
      puts "Error while copying #{ source_file } to #{ target_path }"
    end
  end
end