require "shellwords"
require "socket"
require "shakapacker/configuration"
require "shakapacker/dev_server"
require "shakapacker/runner"

module Shakapacker
  class DevServerRunner < Shakapacker::Runner
    def run
      load_config
      detect_unsupported_switches!
      detect_port!
      execute_cmd
    end

    private

      def load_config
        app_root = Pathname.new(@app_path)

        @config = Configuration.new(
          root_path: app_root,
          config_path: Pathname.new(@shakapacker_config),
          env: ENV["RAILS_ENV"]
        )

        dev_server = DevServer.new(@config)

        @hostname          = dev_server.host
        @port              = dev_server.port
        @pretty            = dev_server.pretty?
        @https             = dev_server.protocol == "https"
        @hot               = dev_server.hmr?

      rescue Errno::ENOENT, NoMethodError
        $stdout.puts "webpack 'dev_server' configuration not found in #{@config.config_path}[#{ENV["RAILS_ENV"]}]."
        $stdout.puts "Please run bundle exec rails shakapacker:install to install Shakapacker"
        exit!
      end

      UNSUPPORTED_SWITCHES = %w[--host --port]
      private_constant :UNSUPPORTED_SWITCHES
      def detect_unsupported_switches!
        unsupported_switches = UNSUPPORTED_SWITCHES & @argv
        if unsupported_switches.any?
          $stdout.puts "The following CLI switches are not supported by Shakapacker: #{unsupported_switches.join(' ')}. Please edit your command and try again."
          exit!
        end

        if @argv.include?("--https") && !@https
          $stdout.puts "--https requires that 'server' in shakapacker.yml is set to 'https'"
          exit!
        end
      end

      def detect_port!
        server = TCPServer.new(@hostname, @port)
        server.close

      rescue Errno::EADDRINUSE
        $stdout.puts "Another program is running on port #{@port}. Set a new port in #{@config.config_path} for dev_server"
        exit!
      end

      def execute_cmd
        env = Shakapacker::Compiler.env
        env["SHAKAPACKER_CONFIG"] = @shakapacker_config
        env["WEBPACK_SERVE"] = "true"
        env["NODE_OPTIONS"] = ENV["NODE_OPTIONS"] || ""

        cmd = build_cmd

        if @argv.include?("--debug-webpacker")
          Shakapacker.puts_deprecation_message(
            Shakapacker.short_deprecation_message(
              "--debug-webpacker",
              "--debug-shakapacker"
            )
          )
        end

        if @argv.delete("--debug-shakapacker") || @argv.delete("--debug-webpacker")
          env["NODE_OPTIONS"] = "#{env["NODE_OPTIONS"]} --inspect-brk --trace-warnings"
        end

        cmd += ["--config", @webpack_config]
        cmd += ["--progress", "--color"] if @pretty

        # Default behavior of webpack-dev-server is @hot = true
        cmd += ["--hot", "only"] if @hot == "only"
        cmd += ["--no-hot"] if !@hot

        cmd += @argv

        Dir.chdir(@app_path) do
          Kernel.exec env, *cmd
        end
      end

      def build_cmd
        if Shakapacker::Utils::Misc.use_package_json_gem
          return package_json.manager.native_exec_command("webpack", ["serve"])
        end

        return ["#{@node_modules_bin_path}/webpack", "serve"] if node_modules_bin_exist?

        ["yarn", "webpack", "serve"]
      end

      def node_modules_bin_exist?
        File.exist?("#{@node_modules_bin_path}/webpack-dev-server")
      end
  end
end