require 'htmlentities'

module SifttterRedux
  # Sifttter Module
  # Used to examine Sifttter data and create
  # Day One entries as necessary.
  module Sifttter
    extend self

    class << self
      # Stores the collection of entries to create.
      # @return [Hash]
      attr_accessor :entries
    end

    # Generates an ERB template for a Day One entry
    # @param [String] datestamp The ISO8601 datestamp
    # @param [String] entrytext The text of the entry
    # @param [Boolean] starred Whether the entry should be starred
    # @param [String] uuid The UUID of the entry
    def generate_template(datestamp, entrytext, starred, uuid)
      ERB.new <<-XMLTEMPLATE
      <?xml version="1.0" encoding="UTF-8"?>
      <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
      <plist version="1.0">
      <dict>
        <key>Creation Date</key>
        <date><%= datestamp %></date>
        <key>Entry Text</key>
        <string><%= entrytext %></string>
        <key>Starred</key>
        <<%= starred %>/>
        <key>Tags</key>
        <array>
          <string>daily logs</string>
        </array>
        <key>UUID</key>
        <string><%= uuid %></string>
      </dict>
      </plist>
      XMLTEMPLATE
    end

    # Opens a filepath and parses it for Sifttter
    # data for the passed date.
    # @param [String] file The filepath to parse
    # @param [Date] date The date to search for
    # @return [void]
    def parse_sifttter_file(filepath, date)
      title = File.basename(filepath).gsub(/^.*?\/([^\/]+)$/, "\\1") + "\n"

      date_regex = /(?:#{ date.strftime("%B") } 0?#{ date.strftime("%-d") }, #{ date.strftime("%Y") })/
      time_regex = /(?:\d{1,2}:\d{1,2}\s?[AaPpMm]{2})/
      entry_regex = /@begin\n@date\s#{ date_regex }(?: at (#{ time_regex }?)\n)?(.*?)\n@end/m

      contents = File.read(filepath)
      cur_entries = contents.scan(entry_regex)
      unless cur_entries.empty?
        @entries.merge!(title => []) unless @entries.key?(title)
        cur_entries.each { |e| @entries[title] << [e[0], e[1].strip] }
      end
    end

    # Finds Siftter data for the passed date and
    # creates corresponding Day One entries.
    # @param [Date] date The date to search for
    # @return [void]
    def self.run(date)
      @entries = {}
      uuid = SecureRandom.uuid.upcase.gsub(/-/, '').strip
      date_for_title = date.strftime('%B %d, %Y')
      datestamp = date.to_time.utc.iso8601
      starred = false

      output_dir = configuration.sifttter_redux[:dayone_local_filepath]
      Dir.mkdir(output_dir) unless Dir.exists?(output_dir)

      files = `find #{ configuration.sifttter_redux[:sifttter_local_filepath] } -type f -name "*.txt" | grep -v -i daily | sort`
      if files.empty?
        messenger.error('No Sifttter files to parse...')
        messenger.error('Is Dropbox Uploader configured correctly?')
        messenger.error("Is #{ configuration.sifttter_redux[:sifttter_remote_filepath] } the correct remote filepath?")
        exit!(1)
      end

      files.split("\n").each do |file|
        file.strip!
        if File.exists?(file)
          parse_sifttter_file(file, date)
        end
      end

      if @entries.length > 0

        entrytext = "# Things done on #{ date_for_title }\n"
        @entries.each do |key, value|
          coder = HTMLEntities.new
          entrytext += '### ' + key.gsub(/.txt/, '').gsub(/_/, ' ').upcase + "\n\n"
          value.each { |v| entrytext += "#{ coder.encode(v[1].gsub(/%time%/, v[0])) }\n" }
          entrytext += "\n"
        end

        template = generate_template(datestamp, entrytext, starred, uuid)
        fh = File.new(File.expand_path("#{ output_dir }/#{ uuid }.doentry"), 'w+')
        fh.puts template.result(binding)
        fh.close
        messenger.success("Entry logged for #{ date_for_title }...")
      else
        messenger.warn('No entries found...')
      end
    end
  end
end