import os, stat
import re
from pathlib import Path
from urllib.parse import urljoin, unquote as urlunquote

from django.conf import settings
from django.shortcuts import render
from django.http import HttpResponse

from troggle.core.models.survex import DrawingFile
from troggle.core.views.expo import getmimetype
#import parsers.surveys

'''Some of these views serve files as binary blobs, and simply set the mime type based on the file extension,
as does the urls.py dispatcher which sends them here. Here they should actually have the filetype checked 
by looking inside the file before being served.

need to check if invalid query string is invalid, or produces multiple replies
and render a user-friendly error page.
'''

def dwgdata(request):
    '''Report on all the drawing files in the system. These were loaded by parsing the entire directory tree
    '''
    dwgfiles = DrawingFile.objects.all()
    return render(request, 'dwgfiles.html', { 'dwgfiles':dwgfiles, 'settings': settings })
    

def dwgfilesingle(request, path):
    '''sends a single binary file to the user, We should have a renderer that syntax-colours this Tunnel xml 
    but it might be a Therion file
    '''
    try:
        dwgfile = DrawingFile.objects.get(dwgpath=urlunquote(path)) 
    except:
        message = f'Drawing file error or not found \'{path}\' .'
        return render(request, 'errors/generic.html', {'message': message})   
        
    tfile = Path(settings.DRAWINGS_DATA, dwgfile.dwgpath)
    try: # for display not download
        return HttpResponse(content=open(tfile, errors='strict'), content_type="text/xhtml") 
    except UnicodeDecodeError:
        try:
            return HttpResponse(content=open(tfile,encoding='iso-8859-1'), content_type="text/xhtml") 
        except: 
            return HttpResponse(content=open(tfile,mode='rb'), content_type="text/xhtml") 
        else:
            return HttpResponse(content=open(tfile, errors='ignore'), content_type="text/xhtml") 
    else:
        return HttpResponse(content="Unable to understand the encoding for this file: not UTF-8 nor iso-8859-1, or some other read error happened.") 
    
    
def dwgfileupload(request, path):
    '''Use bits of this to REGISTEr a recently uploaded dwg file which used dwgupload
    '''
    try:
        dwgfile = DrawingFile.objects.get(dwgpath=urlunquote(path)) # need to check if inavlid query string and produce friendly error
    except:
        message = f'Drawing file error or not found \'{path}\' .'
        return render(request, 'errors/generic.html', {'message': message})   
    tfile = Path(settings.DRAWINGS_DATA, dwgfile.dwgpath)
    
    project, user, password, tunnelversion = request.POST["tunnelproject"], request.POST["tunneluser"], request.POST["tunnelpassword"], request.POST["tunnelversion"]
    print(project, user, tunnelversion)
    
    
    if not (len(list(request.FILES.values())) == 1): # "only one file to upload"
         return HttpResponse(content="Error: more than one file selected for upload", content_type="text/plain")
       
    uploadedfile = list(request.FILES.values())[0]
        
    if uploadedfile.field_name != "sketch":
        return HttpResponse(content="Error: non-sketch file uploaded", content_type="text/plain")
    if uploadedfile.content_type != "text/plain":
        return HttpResponse(content="Error: non-plain content type", content_type="text/plain")
        
    # could use this to add new files
    if os.path.split(path)[1] != uploadedfile.name:  
        return HttpResponse(content="Error: name disagrees", content_type="text/plain")
    
    orgsize = dwgfile.filesize   # = os.stat(tfile)[stat.ST_SIZE]
        
    ttext = uploadedfile.read()
    
    # could check that the user and projects agree here
    
    fout = open(tfile, "w")
    fout.write(ttext)
    fout.close()
    
    # redo its settings of 
    parsers.surveys.SetTunnelfileInfo(dwgfile) # commented out
    dwgfile.save()
    
    uploadedfile.close()
    message = "File size %d overwritten with size %d" % (orgsize, dwgfile.filesize)
    return HttpResponse(content=message, content_type="text/plain")