# Copyright (c) 2006-2008 Andreas Kloeckner, Christoph Burgmer
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.




import _tagpy
from _tagpy import Tag, File, AudioProperties, StringType, ReadStyle
#AudioProperties.ReadStyle = _tagpy.ReadStyle




class FileTypeResolver(object):
    def createFile(self, fileName, readAudioProperties=True, 
            audioPropertiesStyle=ReadStyle.Average):
        raise NotImplementedError




class FileRef(object):
    fileTypeResolvers = []

    def __init__(self, f, readAudioProperties=True, 
            audioPropertiesStyle=ReadStyle.Average):
        if isinstance(f, FileRef):
            self._file = f._file
        elif isinstance(f, File):
            self._file = f
        else:
            self._file = FileRef.create(f, readAudioProperties,
                audioPropertiesStyle)

    def tag(self):
        return self._file.tag()

    def audioProperties(self):
        return self._file.audioProperties()

    def file(self):
        return self._file

    def save(self):
        return self._file.save()

    @classmethod
    def defaultFileExtensions(cls):
        return cls._getExtToModule.keys()

    def isNull(self):
        return not self._file or not self._file.isValid()

    @classmethod
    def addFileTypeResolver(cls, resolver):
        cls.fileTypeResolvers.insert(0, resolver)
        return resolver

    @staticmethod
    def _getExtToModule():
        import tagpy.ogg.vorbis
        import tagpy.ogg.flac
        import tagpy.mpeg, tagpy.flac, tagpy.mpc

        #import tagpy.wavpack, tagpy.ogg.speex, tagpy.trueaudio

        return {
                "ogg": tagpy.ogg.vorbis,
                "mp3": tagpy.mpeg,
                "oga": tagpy.ogg.flac,
                "flac": tagpy.flac,
                "mpc": tagpy.mpc,
                #".wv": tagpy.wavpack,
                #".spx": tagpy.ogg.speex,
                #".tta": tagpy.trueaudio,
                }

    @classmethod
    def create(cls, fileName, readAudioProperties=True, 
            audioPropertiesStyle=ReadStyle.Average):
        for resolver in cls.fileTypeResolvers:
            file = resolver.createFile(fileName, readAudioProperties,
                audioPropertiesStyle)
            if file:
                return file

        from os.path import splitext
        ext = splitext(fileName)[1][1:].lower()

        try:
            module = cls._getExtToModule()[ext]
        except KeyError:
            raise ValueError("unable to find file type")

        return module.File(fileName, readAudioProperties, audioPropertiesStyle)
