from django import forms
from django.http import HttpResponseRedirect, HttpResponse
from django.shortcuts import render_to_response
from django.http import HttpResponse, Http404
import re
import os
import datetime
import difflib

import troggle.settings as settings

        
def ReplaceTabs(stext):
    res = [ ]
    nsl = 0
    for s in re.split("(\t|\n)", stext):
        if s == "\t":
            res.append(" " * (4 - (nsl % 4)))
            nsl = 0
            continue
        if s == "\n":
            nsl = 0
        else:
            nsl += len(s)
        res.append(s)
    return "".join(res)


class SvxForm(forms.Form):
    dirname = forms.CharField(widget=forms.TextInput(attrs={"readonly":True}))
    filename = forms.CharField(widget=forms.TextInput(attrs={"readonly":True}))
    datetime = forms.DateTimeField(widget=forms.TextInput(attrs={"readonly":True}))
    outputtype = forms.CharField(widget=forms.TextInput(attrs={"readonly":True}))
    code = forms.CharField(widget=forms.Textarea(attrs={"cols":150, "rows":18}))
    
    def GetDiscCode(self):
        fname = settings.SURVEX_DATA + self.data['filename'] + ".svx"
        if not os.path.isfile(fname):
            return None
        fin = open(fname, "rb")
        svxtext = fin.read().decode("latin1")   # unicode(a, "latin1")
        svxtext = ReplaceTabs(svxtext).strip()
        fin.close()
        return svxtext
            
    def DiffCode(self, rcode):
        code = self.GetDiscCode()
        difftext = difflib.unified_diff(code.splitlines(), rcode.splitlines())
        difflist = [ diffline.strip()  for diffline in difftext  if not re.match("\s*$", diffline) ]
        return difflist

    def SaveCode(self, rcode):
        fname = settings.SURVEX_DATA + self.data['filename'] + ".svx"
        if not os.path.isfile(fname):
            return False
        fout = open(fname, "w")
        res = fout.write(rcode.encode("latin1"))
        fout.close()
        return True

    def Process(self):
        print "....\n\n\n....Processing\n\n\n"
        cwd = os.getcwd()
        os.chdir(os.path.split(settings.SURVEX_DATA + self.data['filename'])[0])
        os.system(settings.CAVERN + " --log " + settings.SURVEX_DATA + self.data['filename'] + ".svx")
        os.chdir(cwd)
        fin = open(settings.SURVEX_DATA + self.data['filename'] + ".log", "rb")
        log = fin.read()
        fin.close()
        log = re.sub("(?s).*?(Survey contains)", "\\1", log)
        return log


def svx(request, survex_file):
    # get the basic data from the file given in the URL
    dirname = os.path.split(survex_file)[0]
    if dirname:
        dirname += "/"
    nowtime = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    outputtype = "normal"
    form = SvxForm({'filename':survex_file, 'dirname':dirname, 'datetime':nowtime, 'outputtype':outputtype}) 
    
    # if the form has been returned
    difflist = [ ]
    logmessage = ""
    message = ""

    if request.method == 'POST': # If the form has been submitted...
        rform = SvxForm(request.POST) # 
        if rform.is_valid(): # All validation rules pass (how do we check it against the filename and users?)
            rcode = rform.cleaned_data['code']
            outputtype = rform.cleaned_data['outputtype']
            difflist = form.DiffCode(rcode)
            print "ssss", rform.data
            
            if "revert" in rform.data:
                pass
            if "process" in rform.data:
                if not difflist:
                    message = "OUTPUT FROM PROCESSING"
                    logmessage = form.Process()
                    print logmessage
                else:
                    message = "SAVE FILE FIRST"
                    form.data['code'] = rcode
            if "save" in rform.data:
                print "sssavvving"
                if form.SaveCode(rcode):
                    message = "SAVVVED"
                    # we will reload later
                else:
                    message = "FAILED TO SAVE"
                    form.data['code'] = rcode
            if "diff" in rform.data:
                form.data['code'] = rcode
    
    
    #process(survex_file)
    if 'code' not in form.data:    
        form.data['code'] = form.GetDiscCode()
    
    if not difflist:
        difflist.append("none")
    if message:
        difflist.insert(0, message)
    
    svxincludes = re.findall('\*include\s+"?(.*?)(?:\.svx)?"?\s*?\n(?i)', form.data['code'])
    
    vmap = {'settings': settings,
            'has_3d': os.path.isfile(settings.SURVEX_DATA + survex_file + ".3d"),
            'title': survex_file,
            'svxincludes': svxincludes,
            'difflist': difflist,
            'logmessage':logmessage,
            'form':form}
    if outputtype == "ajax":
        return render_to_response('svxfiledifflistonly.html', vmap)
    return render_to_response('svxfile.html', vmap)

def Dsvx(request, survex_file):
    svx = open(settings.SURVEX_DATA + survex_file + ".svx", "rb")
    return HttpResponse(svx, mimetype="text")

def threed(request, survex_file):
    process(survex_file)
    try:
        threed = open(settings.SURVEX_DATA + survex_file + ".3d", "rb")
        return HttpResponse(threed, mimetype="model/3d")
    except:
        log = open(settings.SURVEX_DATA + survex_file + ".log", "rb")
        return HttpResponse(log, mimetype="text")

def log(request, survex_file):
    process(survex_file)
    log = open(settings.SURVEX_DATA + survex_file + ".log", "rb")
    return HttpResponse(log, mimetype="text")

def err(request, survex_file):
    process(survex_file)
    err = open(settings.SURVEX_DATA + survex_file + ".err", "rb")
    return HttpResponse(err, mimetype="text")

def process(survex_file):
    cwd = os.getcwd()
    os.chdir(os.path.split(settings.SURVEX_DATA + survex_file)[0])
    os.system(settings.CAVERN + " --log " + settings.SURVEX_DATA + survex_file + ".svx")
    os.chdir(cwd)