from xml.dom.minidom import getDOMImplementation
import cStringIO
import os
import gtk
import logging
import dbus

from sugar.datastore import datastore

import constants
from instance import Instance
import recorded
import utils

logger = logging.getLogger('serialize')

def fillMediaHash(doc, mediaHashs):
    for key, value in constants.MEDIA_INFO.items():
        recdElements = doc.documentElement.getElementsByTagName(value['name'])
        for el in recdElements:
            _loadMediaIntoHash( el, mediaHashs[key] )

def _loadMediaIntoHash(el, hash):
    addToHash = True
    recd = recorded.Recorded()
    recd = fillRecdFromNode(recd, el)
    if recd:
        if recd.datastoreId:
            #quickly check: if you have a datastoreId that the file hasn't been deleted,
            #cause if you do, we need to flag your removal
            #2904 trac
            recd.datastoreOb = getMediaFromDatastore( recd )
            if not recd.datastoreOb:
                addToHash = False
            else:
                #name might have been changed in the journal, so reflect that here
                if recd.title != recd.datastoreOb.metadata['title']:
                    recd.setTitle(recd.datastoreOb.metadata['title'])
                if recd.tags != recd.datastoreOb.metadata['tags']:
                    recd.setTags(recd.datastoreOb.metadata['tags'])
                if recd.buddy:
                    recd.downloadedFromBuddy = True

            recd.datastoreOb == None

    if addToHash:
        hash.append(recd )

def getMediaFromDatastore(recd):
    if not recd.datastoreId:
        return None

    if recd.datastoreOb:
        #already have the object
        return recd.datastoreOb

    mediaObject = None
    try:
        mediaObject = datastore.get(recd.datastoreId)
    finally:
        return mediaObject

def removeMediaFromDatastore(recd):
    #before this method is called, the media are removed from the file
    if not recd.datastoreId or not recd.datastoreOb:
        return

    try:
        recd.datastoreOb.destroy()
        datastore.delete(recd.datastoreId)

        recd.datastoreId = None
        recd.datastoreOb = None
    finally:
        #todo: add error message here
        pass

def fillRecdFromNode(recd, el):
    if el.getAttributeNode('type'):
        recd.type = int(el.getAttribute('type'))

    if el.getAttributeNode('title'):
        recd.title = el.getAttribute('title')

    if el.getAttributeNode('time'):
        recd.time = int(el.getAttribute('time'))

    if el.getAttributeNode('photographer'):
        recd.recorderName = el.getAttribute('photographer')

    if el.getAttributeNode('tags'):
        recd.tags = el.getAttribute('tags')
    else:
        recd.tags = ""

    if el.getAttributeNode('recorderHash'):
        recd.recorderHash = el.getAttribute('recorderHash')

    if el.getAttributeNode('colorStroke'):
        recd.colorStroke = el.getAttribute('colorStroke')

    if el.getAttributeNode('colorFill'):
        recd.colorFill = el.getAttribute('colorFill')

    if el.getAttributeNode('buddy'):
        recd.buddy = (el.getAttribute('buddy') == "True")

    if el.getAttributeNode('mediaMd5'):
        recd.mediaMd5 = el.getAttribute('mediaMd5')

    if el.getAttributeNode('thumbMd5'):
        recd.thumbMd5 = el.getAttribute('thumbMd5')

    if el.getAttributeNode('mediaBytes'):
        recd.mediaBytes = el.getAttribute('mediaBytes')

    if el.getAttributeNode('thumbBytes'):
        recd.thumbBytes = el.getAttribute('thumbBytes')

    bt = el.getAttributeNode('base64Thumb')
    if bt:
        try:
            thumbPath = os.path.join(Instance.instancePath, "datastoreThumb.jpg")
            thumbPath = utils.getUniqueFilepath(thumbPath, 0)
            thumbImg = utils.getPixbufFromString(bt.nodeValue)
            thumbImg.save(thumbPath, "jpeg", {"quality":"85"} )
            recd.thumbFilename = os.path.basename(thumbPath)
            logger.debug("saved thumbFilename")
        except:
            logger.error("unable to getRecdBase64Thumb")

    ai = el.getAttributeNode('audioImage')
    if (not ai == None):
        try:
            audioImagePath = os.path.join(Instance.instancePath, "audioImage.png")
            audioImagePath = utils.getUniqueFilepath( audioImagePath, 0 )
            audioImage = utils.getPixbufFromString( ai.nodeValue )
            audioImage.save(audioImagePath, "png", {} )
            recd.audioImageFilename = os.path.basename(audioImagePath)
            logger.debug("loaded audio image and set audioImageFilename")
        except:
            logger.error("unable to load audio image")

    datastoreNode = el.getAttributeNode('datastoreId')
    if datastoreNode:
        recd.datastoreId = datastoreNode.nodeValue

    return recd


def getRecdXmlMeshString(recd):
    impl = getDOMImplementation()
    recdXml = impl.createDocument(None, 'recd', None)
    root = recdXml.documentElement
    _addRecdXmlAttrs(root, recd, True)

    writer = cStringIO.StringIO()
    recdXml.writexml(writer)
    return writer.getvalue()

def _addRecdXmlAttrs(el, recd, forMeshTransmit):
    el.setAttribute('type', str(recd.type))

    if (recd.type == constants.TYPE_AUDIO) and (not forMeshTransmit):
        aiPixbuf = recd.getAudioImagePixbuf()
        if aiPixbuf:
            aiPixbufString = str(utils.getStringEncodedFromPixbuf(aiPixbuf))
            el.setAttribute('audioImage', aiPixbufString)

    if (recd.datastoreId != None) and (not forMeshTransmit):
        el.setAttribute('datastoreId', str(recd.datastoreId))

    el.setAttribute('title', recd.title)
    el.setAttribute('time', str(recd.time))
    el.setAttribute('photographer', recd.recorderName)
    el.setAttribute('recorderHash', str(recd.recorderHash) )
    el.setAttribute('colorStroke', str(recd.colorStroke) )
    el.setAttribute('colorFill', str(recd.colorFill) )
    el.setAttribute('buddy', str(recd.buddy))
    el.setAttribute('mediaMd5', str(recd.mediaMd5))
    el.setAttribute('thumbMd5', str(recd.thumbMd5))
    el.setAttribute('mediaBytes', str(recd.mediaBytes))

    if recd.thumbBytes:
        el.setAttribute('thumbBytes', str(recd.thumbBytes))

    # FIXME: can this be removed, or at least autodetected? has not been
    # changed for ages, should not be relevant
    el.setAttribute('version', '54')

    pixbuf = recd.getThumbPixbuf()
    if pixbuf:
        thumb64 = str(utils.getStringEncodedFromPixbuf(pixbuf))
        el.setAttribute('base64Thumb', thumb64)

def saveMediaHash(mediaHashs, activity):
    impl = getDOMImplementation()
    album = impl.createDocument(None, 'album', None)
    root = album.documentElement

    #flag everything for saving...
    atLeastOne = False
    for type, value in constants.MEDIA_INFO.items():
        typeName = value['name']
        for recd in mediaHashs[type]:
            recd.savedXml = False
            recd.savedMedia = False
            atLeastOne = True

    #and if there is anything to save, save it
    if atLeastOne:
        for type, value in constants.MEDIA_INFO.items():
            typeName = value['name']
            for recd in mediaHashs[type]:
                mediaEl = album.createElement(typeName)
                root.appendChild(mediaEl)
                _saveMedia(mediaEl, recd, activity)

    return album

def _saveMedia(el, recd, activity):
    if recd.buddy == True and recd.datastoreId == None and not recd.downloadedFromBuddy:
        recd.savedMedia = True
        _saveXml(el, recd)
    else:
        recd.savedMedia = False
        _saveMediaToDatastore(el, recd, activity)

def _saveXml(el, recd):
    _addRecdXmlAttrs(el, recd, False)
    recd.savedXml = True

def _saveMediaToDatastore(el, recd, activity):
    #note that we update the recds that go through here to how they would
    #look on a fresh load from file since this won't just happen on close()

    if recd.datastoreId:
        #already saved to the datastore, don't need to re-rewrite the file since the mediums are immutable
        #However, they might have changed the name of the file
        if recd.metaChange:
            recd.datastoreOb = getMediaFromDatastore(recd)
            if recd.datastoreOb.metadata['title'] != recd.title:
                recd.datastoreOb.metadata['title'] = recd.title
                datastore.write(recd.datastoreOb)
            if recd.datastoreOb.metadata['tags'] != recd.tags:
                recd.datastoreOb.metadata['tags'] = recd.tags
                datastore.write(recd.datastoreOb)

            #reset for the next title change if not closing...
            recd.metaChange = False

        #save the title to the xml
        recd.savedMedia = True
        _saveXml(el, recd)

    else:
        #this will remove the media from being accessed on the local disk since it puts it away into cold storage
        #therefore this is only called when write_file is called by the activity superclass
        mediaObject = datastore.create()
        mediaObject.metadata['title'] = recd.title
        mediaObject.metadata['tags'] = recd.tags

        datastorePreviewPixbuf = recd.getThumbPixbuf()
        if recd.type == constants.TYPE_AUDIO:
            datastorePreviewPixbuf = recd.getAudioImagePixbuf()
        elif recd.type == constants.TYPE_PHOTO:
            datastorePreviewFilepath = recd.getMediaFilepath()
            datastorePreviewPixbuf = gtk.gdk.pixbuf_new_from_file(datastorePreviewFilepath)

        if datastorePreviewPixbuf:
            datastorePreviewWidth = 300
            datastorePreviewHeight = 225
            if datastorePreviewPixbuf.get_width() != datastorePreviewWidth:
                datastorePreviewPixbuf = datastorePreviewPixbuf.scale_simple(datastorePreviewWidth, datastorePreviewHeight, gtk.gdk.INTERP_NEAREST)

            datastorePreview = utils.getStringFromPixbuf(datastorePreviewPixbuf)
            mediaObject.metadata['preview'] = dbus.ByteArray(datastorePreview)

        colors = str(recd.colorStroke) + "," + str(recd.colorFill)
        mediaObject.metadata['icon-color'] = colors

        mtype = constants.MEDIA_INFO[recd.type]
        mediaObject.metadata['mime_type'] = mtype['mime']

        mediaObject.metadata['activity_id'] = activity._activity_id

        mediaFile = recd.getMediaFilepath()
        mediaObject.file_path = mediaFile
        mediaObject.transfer_ownership = True

        datastore.write(mediaObject)

        recd.datastoreId = mediaObject.object_id
        recd.savedMedia = True

        _saveXml(el, recd)

        recd.mediaFilename = None