from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from .models import Contest, Band
from django.utils import timezone
from django.contrib import messages
from django import forms
from django.urls import reverse
from django.http import HttpResponseRedirect


from .forms import QSOFormWithTime

import re

def parseCBR(raw):
    """ Parse a CBR file for the CQTU

    Yes, this could be used for other tools, BUT you'd have to take
    look at the regex and parsingfoo, as there is some cqtu specific foo
    inside them.
    """
    kvlinere = re.compile(r"^(?P<key>[A-Z-]+):(?: (?P<value>.*))?$")
    qsore = re.compile(r"^(?P<band>144|432)\s+(?P<mode>[A-Z]{2})\s+(?P<datetime>\d{4}-\d{2}-\d{2} \d{4}) (?P<call_s>[A-Z0-9/-]+)\s+(?P<rst_s>\d{2,3})\s+(?P<exc_s>[A-Z0-9-]+)\s+(?P<call_r>[A-Z0-9/-]+)\s+(?P<rst_r>\d{2,3})\s+(?P<exc_r>[A-Z0-9-]+)\s+0$")


    qsoNo = 1
    info = {
        "call": None,
        "location": None,
        "qsos": [],
    }

    for n, line in enumerate(raw.split("\n"), 1):
        line = line.strip()
        # ignore empty lines
        if line == "":
            continue

        m = kvlinere.match(line)
        if m:
            k = m.group("key")
            if k == "CALLSIGN":
                info["call"] = m.group("value").strip().upper()
            elif k == "LOCATION":
                info["location"] = m.group("value").strip().upper()
            elif k == "QSO":
                q = m.group("value").strip()
                # no-s FM date UTC-HHMM call rst-s exch-s call-r rst-r exch-r
                # no-s / date UTC-HH-MM call rst-s
                qm = qsore.search(q)
                if qm:
                    qsoData = qm.groupdict()
                    qsoTime = timezone.datetime.strptime(qsoData["datetime"], "%Y-%m-%d %H%M")
                    qsoData["datetime"] = timezone.get_current_timezone().localize(qsoTime)
                    qsoData["no_s"] = qsoNo

                    if qsoData["band"] == "144":
                        qsoData["band"] = "2m"
                    elif qsoData["band"] == "432":
                        qsoData["band"] = "70cm"
                    else:
                        raise forms.ValidationError("Error parsing band, needs to be either 144 or 432 (as we only support 2m and 70cm in this contest")

                    info["qsos"].append(qsoData)

                    if info["call"] != qsoData["call_s"]:
                        raise forms.ValidationError("Error in line %d: qso was not made by you? (callsigns do not match)" % n)
                    if info["location"] != qsoData["exc_s"]:
                        raise forms.ValidationError("Error in line %d: exchange does not match your location? (callsigns do not match)" % n)
                else:
                    raise forms.ValidationError("Error in line %d: qso was broken, regex did not match" % n)

                qsoNo += 1
            elif k == "X-QSO":
                qsoNo += 1

        else:
            raise forms.ValidationError("Error in line %d: could not parse \"KEY: value\" pair" % n)

    return info

class CBRForm(forms.Form):
    data = forms.CharField(widget=forms.Textarea, label="Cabrillo data", help_text="Paste your cabrillo file contents here")

    def clean_data(self):
        rawData = self.cleaned_data["data"]
        parsedData = parseCBR(rawData)

        return parsedData

def checkCBRConsistency(contest, user, info):
    errors = []
    qsos = []
    if user.username != info["call"]:
        errors.append("You are not the owner of this logfile! (%s != %s)" % (user.username, info["call"]))

    if user.ref.name != info["location"]:
        errors.append("Location of logfile and registered exchange do not match! (%s != %s)" % (user.ref.name, info["location"]))

    for n, qsoData in enumerate(info["qsos"], 1):
        qsoFormData = {
            #"owner": user,
            "time": qsoData["datetime"],
            "call": qsoData["call_r"],
            "band": Band.objects.get(contest=contest, name=qsoData["band"]).id,
            "reportTX": qsoData["rst_s"],
            "reportRX": qsoData["rst_r"],
            "ownNo": qsoData["no_s"],
            "otherNo": None,
            "refStr": qsoData["exc_r"],
            "remarks": "",
        }

        qsoForm = QSOFormWithTime(user, data=qsoFormData)
        qsoForm.is_valid()
        qsoForm.instance.owner = user
        print(qsoForm.errors)
        qsos.append((qsoForm.instance, qsoForm))

    return qsos, errors

@login_required
def uploadCBR(request):
    if not request.user.ref:
        return HttpResponseRedirect(reverse("contest:index"))

    contest = Contest.objects.get(id=1)
    deadline = False
    form = None
    verifyData = []
    verifyErrors = []
    save = saved = False

    if timezone.now() < contest.deadline:
        if request.method == "POST":
            form = CBRForm(data=request.POST)
            if form.is_valid():
                verifyData, verifyErrors = checkCBRConsistency(contest, request.user, form.cleaned_data["data"])

                if request.POST.get("action") == "save":
                    save = True
                    if not verifyErrors:
                        cnt = 0
                        for qso, qsoForm in verifyData:
                            if qsoForm.is_valid():
                                qso.save()
                                cnt += 1

                        if cnt > 0:
                            messages.success(request, "%d QSOs have been saved from the cbr file" % cnt)
                        else:
                            messages.warnnig(request, "CBR file was parsed, but no QSOs could be saved, as all cointained errors.")

                        return HttpResponseRedirect(reverse("contest:uploadCBR"))
        else:
            form = CBRForm()
    else:
        deadline = True

    return render(request, "contest/uploadCBR.html", {"deadline": deadline, 'form': form, 'verifyData': verifyData, 'verifyErrors': verifyErrors, 'save': save, 'saved': saved})