#!/usr/bin/ruby

require 'optparse'

require 'rubygems'
require 'bindata'

require 'xtmfile/xtmheader'


class XtmJoin
	class XtmJoinArgumentError < ArgumentError ; end

	attr_reader :opts


	def initialize args
		@args = []
		@input_xtm = 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 "Mandatory options"

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

			opts.separator ""
			opts.separator "General options:"

			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_xtm.nil?
	end


	def run
		validate!

		output_file = nil
		# initial file

		in_xtm = File.open( @input_xtm, "rb" )
		header = XtmHeader::read in_xtm

		output_file = header.filename_str

		puts "Writing data to %s" % output_file

		# FIXME: prevent overwriting
		out_xtm = File.open( output_file, "wb" )

		while not in_xtm.eof?
			buffer = in_xtm.read 1024
			out_xtm.write buffer
		end

		# remaining files
	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