import os
import re
import cPickle as pickle
from libdata import LibData
from songInfo import SongInfo


class Library():
	def __init__(self,prnt):
	#def __init__(self):
		self.prnt = prnt
		self.data = LibData()
		self.goodTypes = ["ogg","mp3","wma"]
		# Build up directory if library save
		self.save = os.path.expanduser("~")
		self.save = os.path.join(self.save,".ocarina")
		self.save = os.path.join(self.save,"library.pickle")
		# Load existing library
		if os.path.exists(self.save):
			self.prnt(["Library found, loading..."])
			p = pickle.Unpickler(open(self.save))
			self.data = p.load()


	# Begin a scan on dir
	def scan(self,dir):
		self.data = LibData()
		self.data.path = os.path.expanduser(dir)
		if os.path.exists(self.data.path) == False:
			self.prnt(["Directory not found: "+dir])
			return
		self.prnt(["Scanning: "+self.data.path])
		self.traverse("")
		num = len(self.data.files)
		self.prnt(["Found "+str(num)+" files!"])
		self.dump()


	# Traverse directorys
	def traverse(self,dir):
		# List and sort contents
		contents = os.listdir(os.path.join(self.data.path,dir))
		contents.sort()
		for entry in contents:
			joined = os.path.join(dir,entry)
			full = os.path.join(self.data.path,joined)
			# Call traverse on directorys
			if os.path.isdir(full):
				self.traverse(joined)
			# Add music to library
			else:
				tSplit = entry.rsplit('.')
				type = tSplit[len(tSplit)-1].lower()
				if (type in self.goodTypes) == True:
					self.add(self.hash(joined),joined)


	# Hash a file and return list of words
	def hash(self,file):
		file = file.lower()
		# Only keep letters and numbers
		words = re.sub('[^a-z0-9]',' ',file).split()
		return words


	# Add song to library
	def add(self,words,file):
		index = len(self.data.files)
		info = SongInfo()
		info.filename = os.path.join(self.data.path,file)
		self.data.files+=[info]
		for word in words:
			if (word in self.data.map.keys()) == True:
				self.data.map[word]+=[index]
			else:
				self.data.map[word] = [index]


	# Dump to file
	def dump(self):
		out = open(self.save,'w')
		p = pickle.Pickler(out,2)
		p.dump(self.data)
		out.close()


	# Return true if file is in the library
	def has(self,file):
		words = self.hash(file)
		if len(words) == 0:
			return -1
		if (words[0] in self.data.map.keys()) == False:
			return -1
		indices = set(self.data.map[words[0]])
		for word in words[1:]:
			indices = indices & set(self.data.map[word])
			if len(indices) == 1:
				return indices.pop()
		return -1