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

from django.conf import settings
from django.shortcuts import render
from django.http import HttpResponse, Http404

from troggle.core.models_survex import ScansFolder, SingleScan, SurvexBlock, TunnelFile
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 inavlid query string is invalid, or produces multiple replies
 and render a user-friendly error page.
'''

def surveyscansfolder(request, path):
    #print [ s.walletname  for s in ScansFolder.objects.all() ]
    scansfolder = ScansFolder.objects.get(walletname=urlunquote(path))  # need to check if inavlid query string and produce friendly error
    return render(request, 'scansfolder.html', { 'scansfolder':scansfolder, 'settings': settings })

def surveyscansingle(request, path, file):
    '''sends a single binary file to the user,
    '''
    scansfolder = ScansFolder.objects.get(walletname=urlunquote(path)) # need to check if inavlid query string and produce friendly error
    singlescan = SingleScan.objects.get(scansfolder=scansfolder, name=file)
    # print(" - surveyscansingle {}:{}:{}:".format(path, file, getmimetype(file)))
    return HttpResponse(content=open(singlescan.ffile,"rb"), content_type=getmimetype(file)) # any type of image


def surveyscansfolders(request):
    manyscansfolders = ScansFolder.objects.all()
    return render(request, 'manyscansfolders.html', { 'manyscansfolders':manyscansfolders, 'settings': settings })
    
    
def tunneldata(request):
    tunnelfiles = TunnelFile.objects.all()
    return render(request, 'tunnelfiles.html', { 'tunnelfiles':tunnelfiles, '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
    '''
    tunnelfile = TunnelFile.objects.get(tunnelpath=urlunquote(path)) # need to check if invalid query string and produce friendly error
    tfile = Path(settings.TUNNEL_DATA, tunnelfile.tunnelpath)
    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 tunnelfileupload(request, path):
    tunnelfile = TunnelFile.objects.get(tunnelpath=urlunquote(path)) # need to check if inavlid query string and produce friendly error
    tfile = Path(settings.TUNNEL_DATA, tunnelfile.tunnelpath)
    
    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 = tunnelfile.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(tunnelfile)
    tunnelfile.save()
    
    uploadedfile.close()
    message = "File size %d overwritten with size %d" % (orgsize, tunnelfile.filesize)
    return HttpResponse(content=message, content_type="text/plain")