import os
import re
import json
import operator
from urllib.parse import urljoin
from pathlib import Path
from functools import reduce

from django.db import models
from django.conf import settings
from django.urls import reverse


class SurvexDirectory(models.Model):
    path = models.CharField(max_length=200)
    cave = models.ForeignKey('Cave', blank=True, null=True,on_delete=models.SET_NULL)
    primarysurvexfile = models.ForeignKey('SurvexFile', related_name='primarysurvexfile', blank=True, null=True,on_delete=models.SET_NULL)
    # could also include files in directory but not referenced
    
    class Meta:
        ordering = ('id',)
        verbose_name_plural = "Survex directories"

    def __str__(self):
        return "[SurvexDirectory:"+str(self.path)  + " |  Primary svx:" + str(self.primarysurvexfile.path) +".svx ]" 


class SurvexFile(models.Model):
    path = models.CharField(max_length=200)
    survexdirectory = models.ForeignKey("SurvexDirectory", blank=True, null=True,on_delete=models.SET_NULL)
    cave = models.ForeignKey('Cave', blank=True, null=True,on_delete=models.SET_NULL)
    
    class Meta:
        ordering = ('id',)

    # Don't change from the default as that breaks troggle webpages and internal referencing!
    # def __str__(self):
        # return "[SurvexFile:"+str(self.path) + "-" + str(self.survexdirectory) + "-" + str(self.cave)+"]" 

    def exists(self):
        fname = os.path.join(settings.SURVEX_DATA, self.path + ".svx")
        return os.path.isfile(fname)
    
    def OpenFile(self):
        fname = os.path.join(settings.SURVEX_DATA, self.path + ".svx")
        return open(fname)
    
    def SetDirectory(self):
        dirpath = os.path.split(self.path)[0]
        # pointless search every time we import a survex file if we know there are no duplicates..
        # don't use this for initial import.
        survexdirectorylist = SurvexDirectory.objects.filter(cave=self.cave, path=dirpath)
        if survexdirectorylist:
            self.survexdirectory = survexdirectorylist[0]
        else:
            survexdirectory = SurvexDirectory(path=dirpath, cave=self.cave, primarysurvexfile=self)
            survexdirectory.save()
            self.survexdirectory = survexdirectory
        self.save()
        
    def __str__(self):
        return self.path

class SurvexStationLookUpManager(models.Manager):
    def lookup(self, name):
        blocknames, sep, stationname = name.rpartition(".")
        return self.get(block = SurvexBlock.objects.lookup(blocknames),
                        name__iexact = stationname)

class SurvexStation(models.Model):
    name        = models.CharField(max_length=100)   
    block       = models.ForeignKey('SurvexBlock', null=True,on_delete=models.SET_NULL)
#   equate      = models.ForeignKey('SurvexEquate', blank=True, null=True,on_delete=models.SET_NULL)
    objects = SurvexStationLookUpManager()
    x = models.FloatField(blank=True, null=True)
    y = models.FloatField(blank=True, null=True)
    z = models.FloatField(blank=True, null=True)
    
    def path(self):
        r = self.name
        b = self.block
        while True:
            if b.name:
                r = b.name + "." + r
            if b.parent:
                b = b.parent
            else:
                return r

    class Meta:
        ordering = ('id',)
    def __str__(self):
        return self.name and str(self.name) or 'no name'

#
# Single SurvexBlock 
# 
class SurvexBlockLookUpManager(models.Manager):
    def lookup(self, name):
        if name == "":
            blocknames = []
        else:
            blocknames = name.split(".")
        block = SurvexBlock.objects.get(parent=None, survexfile__path=settings.SURVEX_TOPNAME)
        for blockname in blocknames:
            block = SurvexBlock.objects.get(parent=block, name__iexact=blockname)
        return block

class SurvexBlock(models.Model):
    objects = SurvexBlockLookUpManager()
    name       = models.CharField(max_length=100)
    title      = models.CharField(max_length=200)
    parent     = models.ForeignKey('SurvexBlock', blank=True, null=True,on_delete=models.SET_NULL)
    cave       = models.ForeignKey('Cave', blank=True, null=True,on_delete=models.SET_NULL)
    
    date       = models.DateField(blank=True, null=True)
    expeditionday = models.ForeignKey("ExpeditionDay", null=True,on_delete=models.SET_NULL)
    expedition = models.ForeignKey('Expedition', blank=True, null=True,on_delete=models.SET_NULL)
        
    survexfile = models.ForeignKey("SurvexFile", blank=True, null=True,on_delete=models.SET_NULL)
    survexpath = models.CharField(max_length=200)   # the path for the survex stations
    
    scanswallet = models.ForeignKey("Wallet", null=True,on_delete=models.SET_NULL)  
    
    legsall   = models.IntegerField(null=True)  # summary data for this block
    legslength = models.FloatField(null=True)
    
    class Meta:
        ordering = ('id',)

    def __str__(self):
        return "[SurvexBlock:"+ str(self.name) + "-path:" + \
            str(self.survexpath) + "-cave:" + \
            str(self.cave) + "]" 
            
    def __str__(self):
        return self.name and str(self.name) or 'no name'

    def isSurvexBlock(self): # Function used in templates
        return True

    def GetPersonroles(self):
        '''
        But apparently never used !?
        '''
        res = [ ]
        for personrole in self.survexpersonrole_set.order_by('personexpedition'):
            res.append({'person':personrole.personexpedition.person, 'expeditionyear':personrole.personexpedition.expedition.year})
        return res
   
    def DayIndex(self):
        return list(self.expeditionday.survexblock_set.all()).index(self)

class SurvexPersonRole(models.Model):
    survexblock         = models.ForeignKey('SurvexBlock',on_delete=models.CASCADE)
        # increasing levels of precision
    personname          = models.CharField(max_length=100)
    person              = models.ForeignKey('Person', blank=True, null=True,on_delete=models.SET_NULL)
    personexpedition    = models.ForeignKey('PersonExpedition', blank=True, null=True,on_delete=models.SET_NULL)
    persontrip          = models.ForeignKey('PersonTrip', blank=True, null=True,on_delete=models.SET_NULL)  
    expeditionday       = models.ForeignKey("ExpeditionDay", null=True,on_delete=models.SET_NULL)
    
    def __str__(self):
        return str(self.person) + " - " + str(self.survexblock) 

class Wallet(models.Model):
    '''We do not keep the JSON values in the database, we query them afresh each time,
    but we will change this when we need to do a Django query on e.g. personame
    '''
    fpath               = models.CharField(max_length=200)
    walletname          = models.CharField(max_length=200)
    
    class Meta:
        ordering = ('walletname',)
    
    def get_absolute_url(self):
        return urljoin(settings.URL_ROOT, reverse('singlewallet', kwargs={"path":re.sub("#", "%23", self.walletname)}))

    def get_json(self):
        jsonfile = Path(self.fpath, 'contents.json')
        if not Path(jsonfile).is_file():
            #print(f'{jsonfile} is not a file')
            return None
        else:
            with open(jsonfile) as json_f:
                try:
                    waldata = json.load(json_f)
                except:
                    wurl = f"/scanupload/{self.walletname}" # .replace('#', ':')     
                    message = f"! {str(self.walletname)} Failed to load {jsonfile} JSON file"
                    #print(message)
                    raise

        return waldata
        
    def year(self): 
        if self.walletname[4] != "#":
             return None
        year = int(self.walletname[0:4])
        if year < 1976 or year > 2050:
            return None  
        else:
            return str(year)
        

    # Yes this is horribly, horribly inefficient, esp. for a page that have date, people and cave in it
    def date(self):
        if not self.get_json():
            return None
        jsondata = self.get_json()
        return jsondata["date"]
        
    def people(self):
        if not self.get_json():
            return None
        jsondata = self.get_json()
        return jsondata["people"]
        
    def cave(self):
        if not self.get_json():
            return None
        jsondata = self.get_json()
        return jsondata["cave"]

    def name(self):
        if not self.get_json():
            return None
        jsondata = self.get_json()
        return jsondata["name"]

    def get_fnames(self):
        '''Filenames without the suffix, i.e. without the ".jpg"
        '''
        dirpath = Path(settings.SCANS_ROOT, self.fpath)
        files = []
        if dirpath.is_dir():
            try:
                for f in dirpath.iterdir():
                    if f.is_file():
                        if f.name != 'contents.json' and f.name != 'walletindex.html':
                            files.append(Path(f.name).stem)
            except FileNotFoundError:
                pass
        return files


    def get_ticks(self):
        waldata = self.get_json()
        if not waldata:
            return {}
        ticks = {}
        
        # Initially, are there any required survex files present ?
        survexok = "red"
        ticks["S"] = "red"
        if waldata["survex not required"]:
            survexok = "green"
            ticks["S"] = "green"
        else:
            if waldata["survex file"]:
                if not type(waldata["survex file"])==list: # a string also is a sequence type, so do it this way
                    waldata["survex file"] = [waldata["survex file"]]
                ngood = 0
                nbad = 0
                ticks["S"] = "lightblue"
                for svx in waldata["survex file"]:
                    if svx !="":
                        if (Path(settings.SURVEX_DATA) / svx).is_file():
                            ngood += 1
                        else:
                            nbad += 1
                if nbad == 0 and ngood >= 1:
                    ticks["S"] = "green"
                if nbad >= 1 and ngood >= 1:
                    ticks["S"] = "orange"
                if nbad >= 1 and ngood == 0:
                    ticks["S"] = "red"
        
       # Cave Description
        if waldata["description written"]: 
            ticks["C"] = "green"
        else:
            ticks["C"] = survexok
        # QMs
        if waldata["qms written"]:
            ticks["Q"] = "green"
        else:
            ticks["Q"] = survexok    
                
        # Notes, Plan, Elevation; Tunnel
        if waldata["electronic survey"]:
            ticks["N"] = "green"
            ticks["P"] = "green"
            ticks["E"] = "green"
            ticks["T"] = "green"
        else:
        
            files = self.get_fnames()
            print(self.walletname,files)
            # Notes required
            notes_scanned = reduce(operator.or_, [f.startswith("note") for f in files], False)
            notes_scanned = reduce(operator.or_, [f.endswith("notes") for f in files], notes_scanned)
            if notes_scanned:
                ticks["N"] = "green"
            else:
                ticks["N"] = "red"

            # Plan drawing required
            plan_scanned = reduce(operator.or_, [f.startswith("plan") for f in files], False)
            plan_scanned = reduce(operator.or_, [f.endswith("plan") for f in files], plan_scanned)
            plan_drawing_required = not (plan_scanned or waldata["plan drawn"] or waldata["plan not required"])
            if plan_drawing_required:
                ticks["P"] = "red"
            else:
                ticks["P"] = "green"

            # Elev drawing required
            elev_scanned = reduce(operator.or_, [f.startswith("elev") for f in files], False)
            elev_scanned = reduce(operator.or_, [f.endswith("elev") for f in files], elev_scanned)
            elev_scanned = reduce(operator.or_, [f.endswith("elevation") for f in files], elev_scanned)
            elev_drawing_required = not (elev_scanned or waldata["elev drawn"] or waldata["elev not required"])
            if elev_drawing_required:
                ticks["E"] = "red"
            else:
                ticks["E"] = "green"

            # Tunnel / Therion
            if elev_drawing_required or plan_drawing_required:
                ticks["T"] = "red"
            else:
                ticks["T"] = "green"
      

        # Website
        if waldata["website updated"]:
            ticks["W"] = "green"
        else:
            ticks["W"] = "red"
  
        return ticks
   
    def __str__(self):
        return "[" + str(self.walletname) + " (Wallet)]"

class SingleScan(models.Model):
    ffile    = models.CharField(max_length=200)
    name     = models.CharField(max_length=200)
    wallet   = models.ForeignKey("Wallet", null=True,on_delete=models.SET_NULL)
    
    class Meta:
        ordering = ('name',)
    
    def get_absolute_url(self):
        return urljoin(settings.URL_ROOT, reverse('scansingle', kwargs={"path":re.sub("#", "%23", self.wallet.walletname), "file":self.name}))
 
    def __str__(self):
        return "Survey Scan Image: " + str(self.name) + " in " + str(self.wallet)

class DrawingFile(models.Model):
    dwgpath          = models.CharField(max_length=200)
    dwgname          = models.CharField(max_length=200)
    dwgwallets       = models.ManyToManyField("Wallet") # implicitly links via folders to scans to SVX files
    scans            = models.ManyToManyField("SingleScan")  # implicitly links via scans to SVX files
    dwgcontains      = models.ManyToManyField("DrawingFile")  # case when its a frame type
    filesize         = models.IntegerField(default=0)
    npaths           = models.IntegerField(default=0)
    survexfiles      = models.ManyToManyField("SurvexFile")  # direct link to SVX files - not populated yet

    class Meta:
        ordering = ('dwgpath',)

    def __str__(self):
        return "Drawing File: " + str(self.dwgname) + " (" + str(self.filesize) + " bytes)"