import typing

from hydrus.core import HydrusConstants as HC
from hydrus.core import HydrusExceptions
from hydrus.core.files.HydrusArchiveHandling import GetZipAsPath
from hydrus.core.files.images import HydrusImageHandling

import xml.etree.ElementTree as ET

from PIL import Image as PILImage

DOCX_XPATH = ".//{*}Override[@PartName='/word/document.xml'][@ContentType='application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml']"
XLSX_XPATH = ".//{*}Override[@PartName='/xl/workbook.xml'][@ContentType='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml']"
PPTX_XPATH = ".//{*}Override[@PartName='/ppt/presentation.xml'][@ContentType='application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml']"

def MimeFromMicrosoftOpenXMLDocument(path: str):
    
    try:
        
        file = GetZipAsPath( path, '[Content_Types].xml' ).open( 'rb' )
        
        root = ET.parse( file )
        
        if root.find(DOCX_XPATH) is not None:
            
            return HC.APPLICATION_DOCX
            
        elif root.find(XLSX_XPATH) is not None:
            
            return HC.APPLICATION_XLSX
            
        elif root.find(PPTX_XPATH) is not None:
            
            return HC.APPLICATION_PPTX
            
        else:
            
            return None
            
        
    except:
        
        return None
        
    

def GenerateThumbnailNumPyFromOfficePath( path: str, target_resolution: typing.Tuple[ int, int ] ) -> bytes:
    
    try:
        
        zip_path_file_obj = GetZipAsPath( path, 'docProps/thumbnail.jpeg' ).open( 'rb' )
        
    except FileNotFoundError:
        
        raise HydrusExceptions.NoThumbnailFileException( 'No thumbnail.jpeg file!' )
        
    
    pil_image = HydrusImageHandling.GeneratePILImage( zip_path_file_obj )
    
    thumbnail_pil_image = pil_image.resize( target_resolution, PILImage.LANCZOS )
    
    numpy_image = HydrusImageHandling.GenerateNumPyImageFromPILImage( thumbnail_pil_image )
    
    return numpy_image
    

PPTX_ASSUMED_DPI = 300

# https://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/
# PowerPoint uses English Metric Unit (EMU) for vector coordinates
# 1 inch = 914400 EMU

PPTX_PIXEL_PER_EMU = PPTX_ASSUMED_DPI / 914400

def PowerPointResolution( path: str ):
    
    file = GetZipAsPath( path, 'ppt/presentation.xml' ).open( 'rb' )
    
    root = ET.parse( file )
        
    sldSz = root.find('./p:sldSz', {'p': 'http://schemas.openxmlformats.org/presentationml/2006/main'})
    
    x_emu = int(sldSz.get('cx'))
    
    y_emu = int(sldSz.get('cy'))
    
    width = round(x_emu * PPTX_PIXEL_PER_EMU)
    
    height = round(y_emu * PPTX_PIXEL_PER_EMU)
    
    return ( width, height) 
    

def OfficeDocumentWordCount( path: str ):
    
    file = GetZipAsPath( path, 'docProps/app.xml' ).open( 'rb' )
    
    root = ET.parse( file )
    
    words = root.findtext('./ep:Words', namespaces = {'ep' : 'http://schemas.openxmlformats.org/officeDocument/2006/extended-properties'})
    
    num_words = int(words)
    
    return num_words
    

def GetPPTXInfo( path: str ):
    
    try:
        
        ( width, height ) = PowerPointResolution( path )
        
    except:
        
        ( width, height ) = ( None, None )
    
    try:
        
        num_words = OfficeDocumentWordCount( path )
        
    except:
        
        num_words = None
        
    return ( num_words, ( width, height ) )
    

def GetDOCXInfo( path:str ):
    
    try:
        
        num_words = OfficeDocumentWordCount( path )
        
    except:
        
        num_words = None
        
    
    return num_words