require_relative "base"
require_relative "../commands/render"

module Prmd
  module CLI
    # 'render' command module.
    module Render
      extend CLI::Base

      # Returns a OptionParser for parsing 'render' command options.
      #
      # @param (see Prmd::CLI::Base#make_parser)
      # @return (see Prmd::CLI::Base#make_parser)
      def self.make_parser(options = {})
        binname = options.fetch(:bin, "prmd")

        OptionParser.new do |opts|
          opts.banner = "#{binname} render [options] <combined schema>"
          opts.on("-c", "--content-type application/json", String, "Content-Type header") do |c|
            yield :content_type, c
          end
          opts.on("-o", "--output-file FILENAME", String, "File to write result to") do |n|
            yield :output_file, n
          end
          opts.on("-p", "--prepend header,overview", Array, "Prepend files to output") do |p|
            yield :prepend, p
          end
          opts.on("-t", "--template templates", String, "Use alternate template") do |t|
            yield :template, t
          end
        end
      end

      # Executes the 'render' command.
      #
      # @example Usage
      #   Prmd::CLI::Render.execute(argv: ['schema/api.json'],
      #                             template: 'my_template.md.erb',
      #                             output_file: 'schema/api.md')
      #
      # @param (see Prmd::CLI::Base#execute)
      # @return (see Prmd::CLI::Base#execute)
      def self.execute(options = {})
        filename = options.fetch(:argv).first
        _, data = try_read(filename)
        schema = Prmd::Schema.new(data)
        write_result Prmd.render(schema, options), options
      end
    end
  end
end
