#!/usr/bin/ruby

require 'optparse'

require 'rubygems'
require 'bindata'

require 'xtmfile/header'
require 'xtmfile/joiner'
require 'xtmfile/splitter'

class XtmJoin
	class XtmJoinArgumentError < ArgumentError ; end

	attr_reader :opts

	BUFFER_MAX_SIZE = 4096 * 4096

	def initialize args
		@args = []
		@input_filename = nil
		parse_command_line args	
	end

	def parse_command_line args
		@args = args.clone
		@opts = OptionParser.new do |opts|
			opts.banner = "Usage: #{File.basename $0} [options]\n"

			opts.separator ""
			opts.separator "Options"

			opts.on("-i", "--input FILE", "Input XTM file (mandatory)") do |r|
				@input_filename = r
			end

			opts.on("-o", "--output FILE", "Output file (optional)") do |o|
				@output_filename = o
			end

			opts.on("-m", "--md5", "Verify MD5 sums") do |m|
				@verify_md5 = m
			end

			opts.on("-h", "--help", "Show this help") do |h|
				@help = h
			end

			opts.on("-v", "--verbose", "Show warnings too") do |v|
				@verbose = v
			end
			opts.separator ""
		end
	end

	def validate!
		@opts.parse!

		raise XtmJoinArgumentError, "No input XTM file specified!" if @input_filename.nil?

		raise RuntimeError, "Current input XTM does not exist!" unless File.exist? @input_filename 
		raise RuntimeError, "Current input XTML is not a file!" unless File.file? @input_filename
		@input_filename = File.expand_path @input_filename
	end

	def run
		validate!
		
		# FIXME: prevent overwriting
		
		xtmj = XtmFile::Joiner.new @input_filename, @output_filename
		puts "Writing data to %s" % xtmj.output_filename

		xtmj.start do |event, info|
			case event
			when XtmFile::Joiner::EVENT_OPENFILE then
				puts "Opening %s" % info
			when XtmFile::Joiner::EVENT_PROGRESS then
				print "\x1b[uProgress : %s %" % info
				STDOUT.flush
			end
		end

		STDOUT.puts ""		
	end

	def self.main args
		xj = nil
		begin
			xj = XtmJoin.new args
			xj.run
			exit 0
		rescue XtmJoinArgumentError => e
			STDERR.puts "%s" % xj.opts
			STDERR.puts "error: %s" % e.message

			exit 1
		rescue SystemExit => e
			raise e
		rescue Exception => e
			STDERR.puts "error: %s" % e.message
			exit 1
		end
	end
end

XtmJoin.main ARGV