import gc
import hashlib
import hsaudiotag
import hsaudiotag.auto
import hsaudiotag.flac
import hsaudiotag.mpeg
import hsaudiotag.ogg
import HydrusAudioHandling
import HydrusConstants as HC
import HydrusDocumentHandling
import HydrusExceptions
import HydrusFlashHandling
import HydrusImageHandling
import HydrusPaths
import HydrusVideoHandling
import os
import tempfile
import threading
import traceback
import cStringIO
import HydrusData

# Mime

header_and_mime = [
    ( 0, '\xff\xd8', HC.IMAGE_JPEG ),
    ( 0, 'GIF87a', HC.IMAGE_GIF ),
    ( 0, 'GIF89a', HC.IMAGE_GIF ),
    ( 0, '\x89PNG', HC.UNDETERMINED_PNG ),
    ( 0, 'BM', HC.IMAGE_BMP ),
    ( 0, 'CWS', HC.APPLICATION_FLASH ),
    ( 0, 'FWS', HC.APPLICATION_FLASH ),
    ( 0, 'FLV', HC.VIDEO_FLV ),
    ( 0, '%PDF', HC.APPLICATION_PDF ),
    ( 0, 'PK\x03\x04', HC.APPLICATION_ZIP ),
    ( 0, 'hydrus encrypted zip', HC.APPLICATION_HYDRUS_ENCRYPTED_ZIP ),
    ( 4, 'ftypmp4', HC.VIDEO_MP4 ),
    ( 4, 'ftypisom', HC.VIDEO_MP4 ),
    ( 4, 'ftypM4V', HC.VIDEO_MP4 ),
    ( 0, 'fLaC', HC.AUDIO_FLAC ),
    ( 0, '\x30\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C', HC.UNDETERMINED_WM )
    ]

def SaveThumbnailToStream( pil_image, dimensions, f ):
    
    # when the palette is limited, the thumbnail antialias won't add new colours, so you get nearest-neighbour-like behaviour
    
    save_to_png = pil_image.format == 'PNG'
    
    pil_image = HydrusImageHandling.Dequantize( pil_image )
    
    HydrusImageHandling.EfficientlyThumbnailPILImage( pil_image, dimensions )
    
    if save_to_png:
        
        pil_image.save( f, 'PNG' )
        
    else:
        
        pil_image.save( f, 'JPEG', quality = 92 )
        
    
def GenerateThumbnail( path, dimensions = HC.UNSCALED_THUMBNAIL_DIMENSIONS ):
    
    mime = GetMime( path )
    
    f = cStringIO.StringIO()
    
    if mime in HC.IMAGES:
        
        pil_image = HydrusImageHandling.GeneratePILImage( path )
        
        SaveThumbnailToStream( pil_image, dimensions, f )
        
    elif mime == HC.APPLICATION_FLASH:
        
        ( os_file_handle, temp_path ) = HydrusPaths.GetTempPath()
        
        try:
            
            HydrusFlashHandling.RenderPageToFile( path, temp_path, 1 )
            
            pil_image = HydrusImageHandling.GeneratePILImage( temp_path )
            
            SaveThumbnailToStream( pil_image, dimensions, f )
            
        except:
            
            flash_default_path = os.path.join( HC.STATIC_DIR, 'flash.png' )
            
            pil_image = HydrusImageHandling.GeneratePILImage( flash_default_path )
            
            SaveThumbnailToStream( pil_image, dimensions, f )
            
        finally:
            
            del pil_image
            
            HydrusPaths.CleanUpTempPath( os_file_handle, temp_path )
            
        
    else:
        
        ( size, mime, width, height, duration, num_frames, num_words ) = GetFileInfo( path )
        
        cropped_dimensions = HydrusImageHandling.GetThumbnailResolution( ( width, height ), dimensions )
        
        renderer = HydrusVideoHandling.VideoRendererFFMPEG( path, mime, duration, num_frames, cropped_dimensions )
        
        numpy_image = renderer.read_frame()
        
        pil_image = HydrusImageHandling.GeneratePILImageFromNumpyImage( numpy_image )
        
        SaveThumbnailToStream( pil_image, dimensions, f )
        
    
    f.seek( 0 )
    
    thumbnail = f.read()
    
    f.close()
    
    return thumbnail
    
def GetExtraHashesFromPath( path ):
    
    h_md5 = hashlib.md5()
    h_sha1 = hashlib.sha1()
    h_sha512 = hashlib.sha512()
    
    with open( path, 'rb' ) as f:
        
        for block in HydrusPaths.ReadFileLikeAsBlocks( f ):
            
            h_md5.update( block )
            h_sha1.update( block )
            h_sha512.update( block )
            
        
    
    md5 = h_md5.digest()
    sha1 = h_sha1.digest()
    sha512 = h_sha512.digest()
    
    return ( md5, sha1, sha512 )
    
def GetFileInfo( path ):
    
    size = os.path.getsize( path )
    
    if size == 0: raise HydrusExceptions.SizeException( 'File is of zero length!' )
    
    mime = GetMime( path )
    
    if mime not in HC.ALLOWED_MIMES: raise HydrusExceptions.MimeException( 'Filetype is not permitted!' )
    
    width = None
    height = None
    duration = None
    num_frames = None
    num_words = None
    
    if mime in HC.IMAGES:
        
        ( ( width, height ), duration, num_frames ) = HydrusImageHandling.GetImageProperties( path )
        
    elif mime == HC.APPLICATION_FLASH:
        
        ( ( width, height ), duration, num_frames ) = HydrusFlashHandling.GetFlashProperties( path )
        
    elif mime in ( HC.VIDEO_FLV, HC.VIDEO_WMV, HC.VIDEO_MP4, HC.VIDEO_MKV, HC.VIDEO_WEBM ):
        
        ( ( width, height ), duration, num_frames ) = HydrusVideoHandling.GetFFMPEGVideoProperties( path )
        
    elif mime == HC.APPLICATION_PDF: num_words = HydrusDocumentHandling.GetPDFNumWords( path )
    elif mime == HC.AUDIO_MP3: duration = HydrusAudioHandling.GetMP3Duration( path )
    elif mime == HC.AUDIO_OGG: duration = HydrusAudioHandling.GetOGGVorbisDuration( path )
    elif mime == HC.AUDIO_FLAC: duration = HydrusAudioHandling.GetFLACDuration( path )
    elif mime == HC.AUDIO_WMA: duration = HydrusAudioHandling.GetWMADuration( path )
    
    return ( size, mime, width, height, duration, num_frames, num_words )
    
def GetHashFromPath( path ):
    
    h = hashlib.sha256()
    
    with open( path, 'rb' ) as f:
        
        for block in HydrusPaths.ReadFileLikeAsBlocks( f ): h.update( block )
        
    
    return h.digest()
    
def GetMime( path ):
    
    with open( path, 'rb' ) as f:
        
        f.seek( 0 )
        
        bit_to_check = f.read( 256 )
        
    
    for ( offset, header, mime ) in header_and_mime:
        
        offset_bit_to_check = bit_to_check[ offset: ]
        
        if offset_bit_to_check.startswith( header ):
            
            if mime == HC.UNDETERMINED_WM:
                
                if HydrusVideoHandling.HasVideoStream( path ):
                    
                    return HC.VIDEO_WMV
                    
                
                # we'll catch and verify wma later
                
            elif mime == HC.UNDETERMINED_PNG:
                
                return HC.IMAGE_PNG
                
                # atm (Feb 2016), ffmpeg doesn't report duration for apngs, so can't do this just yet.
                #
                #if HydrusVideoHandling.HasVideoStream( path ):
                #    
                #    return HC.VIDEO_APNG
                #    
                #else:
                #    
                #    return HC.IMAGE_PNG
                #    
                
            else:
                
                return mime
                
            
        
    
    try:
        
        mime = HydrusVideoHandling.GetMatroskaOrWebm( path )
        
        return mime
        
    except: pass
    
    hsaudio_object = hsaudiotag.auto.File( path )
    
    if hsaudio_object.valid:
        
        if isinstance( hsaudio_object.original, hsaudiotag.mpeg.Mpeg ): return HC.AUDIO_MP3
        elif isinstance( hsaudio_object.original, hsaudiotag.flac.FLAC ): return HC.AUDIO_FLAC
        elif isinstance( hsaudio_object.original, hsaudiotag.ogg.Vorbis ): return HC.AUDIO_OGG
        elif isinstance( hsaudio_object.original, hsaudiotag.wma.WMADecoder ): return HC.AUDIO_WMA
        
    
    return HC.APPLICATION_UNKNOWN