# frozen_string_literal: true

require 'optparse'
require 'snippit/cli/delete'
require 'snippit/cli/get'
require 'snippit/cli/list'
require 'snippit/cli/save'
require 'snippit/cli/version'

module Snippit
  # Snippit::CLI is the command line interface for Snippit.
  class CLI
    def initialize(args)
      @args = args
      @opts = {}
    end

    # Starts the CLI.
    #
    # @return [Integer] the exit code
    def start
      parser.parse!(@args)

      return Version.new.start if @opts[:version]

      result = start_io
      return result unless result.nil?

      bad_usage
    end

    private

    def parser
      OptionParser.new do |opts|
        opts.banner = 'Usage: snippit|snip [options]'
        opts.separator ''
        opts.separator 'Options:'
        add_list_option(opts)
        add_save_option(opts)
        add_get_option(opts)
        add_delete_option(opts)
        add_version_option(opts)
      end
    end

    def add_save_option(opts)
      opts.on('-s', '-a', '--save PATH', '--add PATH', 'Save a new snippet') do |path|
        @opts[:save] = path
      end
      add_save_helper_options(opts)
    end

    def add_save_helper_options(opts)
      opts.on('-f', '--force', 'Used with --save to overwrite existing snippets') do
        @opts[:force] = true
      end
      opts.on('-n', '--name NAME', 'Used with --save to set the snippet name') do |name|
        @opts[:name] = name
      end
      opts.on('-S', '--slug SLUG', 'Used with --save to set the snippet slug') do |slug|
        @opts[:slug] = slug
      end
    end

    def add_get_option(opts)
      opts.on('-g', '--get SLUG', 'Get a snippet') do |slug|
        @opts[:get] = slug
      end
    end

    def add_delete_option(opts)
      opts.on('-d', '--delete SLUG', 'Delete a snippet') do |slug|
        @opts[:delete] = slug
      end
    end

    def add_list_option(opts)
      opts.on('-l', '--list', 'List all snippet slugs and their names') do
        @opts[:list] = true
      end
    end

    def add_version_option(opts)
      opts.on('-v', '--version', 'Print version') do
        @opts[:version] = true
      end
    end

    def bad_usage
      puts parser
      1
    end

    # Handles options that require IO.
    def start_io
      return List.new.start if @opts[:list]

      return Save.new(@opts[:save], **@opts.slice(:force, :name, :slug)).start if @opts.key?(:save)

      return Get.new(@opts[:get]).start if @opts.key?(:get)

      return Delete.new(@opts[:delete]).start if @opts.key?(:delete)
    end
  end
end