import typing

from qtpy import QtSvg
from qtpy import QtGui as QG
from qtpy import QtCore as QC

from hydrus.core import HydrusExceptions
from hydrus.core.files import HydrusSVGHandling

from hydrus.client.gui import ClientGUIFunctions

def LoadSVGRenderer( path: str ):
    
    renderer = QtSvg.QSvgRenderer()
    
    try:
        
        renderer.load( path )
        
    except:
        
        raise  HydrusExceptions.DamagedOrUnusualFileException( 'Could not load SVG file.' )
        
    
    if not renderer.isValid():
        
        raise  HydrusExceptions.DamagedOrUnusualFileException( 'SVG file is invalid!' )
        
    
    return renderer
    

def GenerateThumbnailNumPyFromSVGPath( path: str, target_resolution: typing.Tuple[int, int] ) -> bytes:
    
    # TODO: SVGs have no inherent resolution, so all this is pretty stupid. we should render to exactly the res we want and then clip the result, not beforehand
    
    try:
        
        renderer = LoadSVGRenderer( path )
        
        # Seems to help for some weird floating point dimension SVGs
        renderer.setAspectRatioMode( QC.Qt.AspectRatioMode.KeepAspectRatio )
        
        ( target_width, target_height ) = target_resolution
        
        qt_image = QG.QImage( target_width, target_height, QG.QImage.Format_RGBA8888 )
        
        qt_image.fill( QC.Qt.transparent )
        
        painter = QG.QPainter( qt_image )
        
        renderer.render( painter )
        
        painter.end()
        
        numpy_image = ClientGUIFunctions.ConvertQtImageToNumPy( qt_image )
        
        thumbnail_numpy_image = numpy_image
        
        return thumbnail_numpy_image
        
    except:
        
        raise HydrusExceptions.NoThumbnailFileException()
        
    

HydrusSVGHandling.GenerateThumbnailNumPyFromSVGPath = GenerateThumbnailNumPyFromSVGPath

def GetSVGResolution( path: str ):
    
    try:
        
        renderer = LoadSVGRenderer( path )
        
        resolution = renderer.defaultSize().toTuple()
        
        return resolution
        
    except:
        
        raise HydrusExceptions.NoResolutionFileException()
        
    

HydrusSVGHandling.GetSVGResolution = GetSVGResolution