import struct

class Settings(object):
	class Banner(object):
		def __init__(self, name):
			self.name = name
			self.sounds = []

		def add_sound(self, delay, sound_id):
			self.sounds.append((delay, sound_id))

	def __init__(self):
		self.banners = []
	
	def add_banner(self, name):
		b = self.Banner(name)
		self.banners.append(b)
		return b
	
	def export(self):
		header_size = 8

		offset = header_size + (4 * len(self.banners))
		banner_offsets = []
		banner_data = []

		for b in self.banners:
			banner_offsets.append(offset)
			
			b_header1 = 'xxxx' # will be replaced later
			b_header2 = struct.pack('>I', len(b.sounds))
			b_sounds = map(lambda x: struct.pack('>II', *x), b.sounds)
			
			offset += 8 + (len(b_sounds) * 8)

			b_data = [b_header1, b_header2]
			b_data.extend(b_sounds)
			banner_data.append(b_data)

		# now build a string table
		str_tab = []

		for b, b_data in zip(self.banners, banner_data):
			b_data[0] = struct.pack('>I', offset)
			offset += len(b.name) + 1
			str_tab.append(b.name)
			str_tab.append('\0')
	
		# whatever
		file_pieces = [
			'NWcs',
			struct.pack('>I', len(self.banners))
			]

		file_pieces.extend(map(lambda x: struct.pack('>I', x), banner_offsets))

		for b_data in banner_data:
			file_pieces.extend(b_data)
		
		file_pieces.extend(str_tab)

		return ''.join(file_pieces)




s = Settings()

one = s.add_banner('beef')
one.add_sound(0, 200)
one.add_sound(5, 400)
one.add_sound(20, 600)

two = s.add_banner('cats')
two.add_sound(5, 20)
two.add_sound(10, 40)

data = s.export()
open('settings.bin', 'wb').write(data)