#!/usr/bin/ruby

# vim: set nosta noet ts=4 sw=4:

# A collection of messages authored from a unique user.

#

# Note that Ezmlm uses the "real name" part of an address

# to identify an author.

#

#    author = Ezmlm::List::Author.new( list, 'acgcbmbmeapgpfckcdol' )

#    author.name            #=> "Help - navigate on interface?"

#    author.first.date.to_s #=> "2017-05-07T14:55:05-07:00"

#

#---

class Ezmlm::List::Author

	include Enumerable

	### Instantiate a new list of messages given

	### a +list+ and an +author_id+.

	###

	def initialize( list, author_id )

		raise ArgumentError, "Unknown list object." unless list.respond_to?( :listdir )

		raise ArgumentError, "Malformed Author ID." unless author_id =~ /^\w{20}$/

		raise "Archiving is not enabled." unless list.archived?

		@list     = list

		@id       = author_id

		@messages = nil

		self.load_index

	end

	# The list object this message is stored in.

	attr_reader :list

	# The author's identifier.

	attr_reader :id

	# The author's name.

	attr_reader :name

	# An array of messages this author has sent.

	attr_reader :messages

	# An array of threads this author has participated in.

	attr_reader :threads

	### Enumerable API:  Lazy load each message ID as a

	### Ezmlm::List::Message, yielding it to the block.

	###

	def each

		self.load_index # refresh for any updates since object was created

		self.messages.each do |id|

			yield Ezmlm::List::Message.new( self.list, id )

		end

	end

	alias_method :each_message, :each

	### Lazy load each thread ID as a Ezmlm::List::Thread, yielding it to the block.

	###

	def each_thread

		self.load_index # refresh for any updates since object was created

		self.threads.each do |id|

			yield Ezmlm::List::Thread.new( self.list, id )

		end

	end

	#########

	protected

	#########

	### Parse the author index into an array of Messages.

	###

	def load_index

		@messages = []

		@threads  = []

		path = self.author_path

		raise "Unknown author: %p" % [ self.id ] unless path.exist?

		path.open( 'r', encoding: Encoding::ISO8859_1 ) do |fh|

			fh.each_line.with_index do |line, i|

				if i.zero?

					@name = line.match( /^\w+ (.+)/ )[1]

				else

					match = line.match( /^(\d+):\d+:(\w+) / ) or next

					self.messages << match[1].to_i

					self.threads  << match[2]

				end

			end

		end

	end

	### Return the path on disk for the author index.

	###

	def author_path

		prefix = self.id[ 0 ..  1 ]

		hash   = self.id[ 2 .. -1 ]

		return self.list.listdir + 'archive' + 'authors' + prefix + hash

	end

end # class Ezmlm::List::Author