import csv
import os
import re
from datetime import date

from django.conf import settings

from troggle.core.models.troggle import DataIssue
from troggle.core.models.caves import QM, Cave, LogbookEntry
from troggle.core.utils import save_carefully

'''Reads the CSV files containg QMs for a select few caves'''

def deleteQMs():
    QM.objects.all().delete()
    DataIssue.objects.filter(parser='QMs').delete()


def parseCaveQMs(cave,inputFile):
    """Runs through the CSV file at inputFile (which is a relative path from expoweb) and 
    saves each QM as a QM instance.
    This is creating and linking a Placeholder logbookentry dated 1st Jan. in the relevant
    year. This is pointless but it is needed because found_by is a ForeignKey in the db 
    and we can't be arsed to fudge this properly with a null.(July 2020)

    Linking to a passage in a SVX file might be more interesting as the QM does sometimes
    have the passage name, e.g. in 204/qm.csv
    C2000-204-39	B	Tree	Pitch in Cave Tree		treeumphant.28	Gosser Streamway
    The CSV file does not have the exact date for the QM, only the year, so links to
    survex files might be ambiguous. But potentially useful?"""

    if cave=='204-steinBH':
        try:
            steinBr=Cave.objects.get(official_name="Steinbrückenhöhle")
        except Cave.DoesNotExist:
            print("Steinbruckenhoehle is not in the database. Please run parsers.")
            return
    elif cave=='234-Hauch':
        try:
            hauchHl=Cave.objects.get(official_name="Hauchhöhle")
        except Cave.DoesNotExist:
            print("Hauchhoehle is not in the database. Please run parsers.")
            return
    elif cave =='161-KH':
        try:
            kh=Cave.objects.get(official_name="Kaninchenhöhle")
        except Cave.DoesNotExist:
            print("KH is not in the database. Please run parsers.")
        parse_KH_QMs(kh, inputFile=inputFile) 
        return

    #qmPath = settings.EXPOWEB+inputFile
    qmPath = os.path.join(settings.EXPOWEB, inputFile)

    qmCSVContents = open(qmPath,'rU')
    dialect=csv.Sniffer().sniff(qmCSVContents.read())
    qmCSVContents.seek(0,0)
    qmReader = csv.reader(qmCSVContents,dialect=dialect)
    next(qmReader) # Skip header row
    for line in qmReader:
        try:
            year=int(line[0][1:5])
            #check if placeholder exists for given year, create it if not
            message = " ! - "+ str(year) + " logbook: placeholder entry for '" + cave + "' created. Should be re-attached to the actual trip."
            if cave=='204-steinBH':
                placeholder, hadToCreate = LogbookEntry.objects.get_or_create(date__year=year, place="204", title="placeholder for QMs in 204", text=message, defaults={"date": date(year, 1, 1),"cave_slug":str(steinBr)})
            elif cave=='234-Hauch':
                placeholder, hadToCreate = LogbookEntry.objects.get_or_create(date__year=year, place="234", title="placeholder for QMs in 234", text=message, defaults={"date": date(year, 1, 1),"cave_slug":str(hauchHl)})
            # if hadToCreate:
                # print(message)
                # DataIssue.objects.create(parser='QMs', message=message)
            QMnum=re.match(r".*?-\d*?-X?(?P<numb>\d*)",line[0]).group("numb")
            newQM = QM()
            newQM.found_by=placeholder
            newQM.number=QMnum
            if line[1]=="Dig":
                newQM.grade="D"
            else:
                newQM.grade=line[1]
            newQM.area=line[2]
            newQM.location_description=line[3]
            
            # Troggle checks if QMs are completed by checking if they have a ticked_off_by trip. 
            # In the table, completion is indicated by the presence of a completion discription.
            newQM.completion_description=line[4]
            newQM.nearest_station_description=line[5]
            if newQM.completion_description:  
                newQM.ticked_off_by=placeholder

            newQM.comment=line[6]
            try:
                preexistingQM=QM.objects.get(number=QMnum, found_by__date__year=year)  #if we don't have this one in the DB, save it
                if preexistingQM.new_since_parsing==False:  #if the pre-existing QM has not been modified, overwrite it
                    preexistingQM.delete()
                    newQM.save()
                else:  # otherwise, print that it was ignored
                    print((" - preserving " + str(preexistingQM) + ", which was edited in admin \r"))
                    
            except QM.DoesNotExist:         #if there is no pre-existing QM, save the new one
                newQM.save() 
                
        except KeyError: #check on this one
            continue
        except IndexError:
            print("Index error in " + str(line))
            continue

def parse_KH_QMs(kh, inputFile):
    """import QMs from the 1623-161 (Kaninchenh�hle) html pages
    """
    khQMs=open(os.path.join(settings.EXPOWEB, inputFile),'r')
    khQMs=khQMs.readlines()
    for line in khQMs:
        res=re.search(r'name=\"[CB](?P<year>\d*)-(?P<cave>\d*)-(?P<number>\d*).*</a> (?P<grade>[ABDCV])<dd>(?P<description>.*)\[(?P<nearest_station>.*)\]',line)
        if res:
            res=res.groupdict()
            year=int(res['year'])
            #check if placeholder exists for given year, create it if not
            message = " ! - "+ str(year) + " logbook: placeholder entry for '161 KH' created. Should be re-attached to the actual trip."
            placeholder, hadToCreate = LogbookEntry.objects.get_or_create(date__year=year, place="161", title="placeholder for QMs in 161", text=message, defaults={"date": date((year), 1, 1),"cave_slug":str(kh)})
            # if hadToCreate:
                # print(message)
                # DataIssue.objects.create(parser='QMs', message=message)
            lookupArgs={
                'found_by':placeholder,
                'number':res['number']
                }
            nonLookupArgs={
                'grade':res['grade'],
                'nearest_station_name':res['nearest_station'],
                'location_description':res['description']
                }
 
            save_carefully(QM,lookupArgs,nonLookupArgs)
        
def Load_QMs():
    deleteQMs()
    parseCaveQMs(cave='204-steinBH',inputFile=r"1623/204/qm.csv")
    parseCaveQMs(cave='234-Hauch',inputFile=r"1623/234/qm.csv")
    parseCaveQMs(cave='161-KH', inputFile="1623/161/qmtodo.htm")
    #parseCaveQMs(cave='balkonhoehle',inputFile=r"1623/264/qm.csv")