require 'xcodeproj'
require 'active_support/core_ext/string/strip'

module Pod
  class Command
    class Init < Command
      self.summary = 'Generate a Podfile for the current directory.'
      self.description = <<-DESC
        Creates a Podfile for the current directory if none currently exists. If
        an `XCODEPROJ` project file is specified or if there is only a single
        project file in the current directory, targets will be automatically
        generated based on targets defined in the project.

        It is possible to specify a list of dependencies which will be used by
        the template in the `Podfile.default` (normal targets) `Podfile.test`
        (test targets) files which should be stored in the
        `~/.cocoapods/templates` folder.
      DESC
      self.arguments = [
        CLAide::Argument.new('XCODEPROJ', :false),
      ]

      def initialize(argv)
        @podfile_path = Pathname.pwd + 'Podfile'
        @project_path = argv.shift_argument
        @project_paths = Pathname.pwd.children.select { |pn| pn.extname == '.xcodeproj' }
        super
      end

      def validate!
        super
        raise Informative, 'Existing Podfile found in directory' unless config.podfile_path_in_dir(Pathname.pwd).nil?
        if @project_path
          help! "Xcode project at #{@project_path} does not exist" unless File.exist? @project_path
          project_path = @project_path
        else
          raise Informative, 'No xcode project found, please specify one' unless @project_paths.length > 0
          raise Informative, 'Multiple xcode projects found, please specify one' unless @project_paths.length == 1
          project_path = @project_paths.first
        end
        @xcode_project = Xcodeproj::Project.open(project_path)
      end

      def run
        @podfile_path.open('w') { |f| f << podfile_template(@xcode_project) }
      end

      private

      # @param  [Xcodeproj::Project] project
      #         The xcode project to generate a podfile for.
      #
      # @return [String] the text of the Podfile for the provided project
      #
      def podfile_template(project)
        podfile = ''
        podfile << "xcodeproj '#{@project_path}'\n\n" if @project_path
        podfile << <<-PLATFORM.strip_heredoc
          # Uncomment this line to define a global platform for your project
          # platform :ios, '8.0'
          # Uncomment this line if you're using Swift
          # use_frameworks!
        PLATFORM

        project.targets.each do |target|
          podfile << target_module(target)
        end
        podfile << "\n"
      end

      # @param  [Xcodeproj::PBXTarget] target
      #         A target to generate a Podfile target module for.
      #
      # @return [String] the text for the target module
      #
      def target_module(target)
        target_module = "\ntarget '#{target.name.gsub(/'/, "\\\\\'")}' do\n"

        if target.name =~ /tests?/i
          target_module << template_contents(config.default_test_podfile_path)
        else
          target_module << template_contents(config.default_podfile_path)
        end
        target_module << "\nend\n"
      end

      def template_contents(path)
        if path.exist?
          path.read.chomp.lines.map { |line| "  #{line}" }.join("\n")
        else
          ''
        end
      end
    end
  end
end
