serradura/slack-time-tracker

# frozen_string_literal: true

module SlashCommand
  module Commands
    class Resume < Template
      NAME = "resume"
      DESC = "Start the timer for an entry. Defaults to the last entry."
      HELP = <<-HELP.strip_heredoc.freeze
        Usage /tt resume [--id ID] [--at TIME]
        -i, --id <ID>\tResume entry with id <id> instead of the last entry.
        -a, --at <TIME> Use this time instead of now.

        Examples:
        `/tt resume -i 99`
        `/tt resume -a '5 minutes ago'`
        `/tt resume --id 99 --at "13:00"`
      HELP

      NO_TIME_ENTRIES = "There’s no time entries. Please, use `/tt in NOTE` to start the timer."
      CURRENT_TIME_ENTRY = "You have been working on \"%{note}\"."
      ACTIVITY_RESTARTED = "You have just started working on a new activity. Keep going."

      DELIMITERS = "\"'“”‘’`"
      AT_PATTERN = /(\-a|([-]{2}|—)at)\s?[#{DELIMITERS}](.+)[#{DELIMITERS}]/.freeze
      ID_PATTERN = /(\-i|\-\-id)\s+(\d+)/.freeze

      def call
        response.result = result
      end

      private

      def result
        @time_entry = find_time_entry

        return NO_TIME_ENTRIES if @time_entry.blank?

        return running_time_entry_message if user.running_activity == @time_entry

        user.stop_running_activity

        return ACTIVITY_RESTARTED if create(@time_entry).persisted?
      end

      def find_time_entry
        id_option = data.match(ID_PATTERN)

        if id_option.present?
          user.time_entries.find_by id: id_option[2]
        else
          user.time_entries.last
        end
      end

      def running_time_entry_message
        CURRENT_TIME_ENTRY % {note: @time_entry.note}
      end

      def create(time_entry)
        user.build_time_entry(start: start_time, note: time_entry.note).tap(&:save)
      end

      def start_time
        at_option = data.match(AT_PATTERN)
        at_option.present? ? time_from(at_option) : Time.current
      end

      def time_from(at_option)
        Chronic.parse(at_option[3])
      end
    end
  end
end