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

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

# from troggle.core.models.survex import SurvexBlock
# from troggle.core.models.troggle import DataIssue # circular import. Hmm

YEAR_RANGE = (1975, 2050)

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)
    walletdate = models.DateField(blank=True, null=True)
    walletyear = models.DateField(blank=True, null=True)

    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):
        """Read the JSON file for the wallet and do stuff
        Do it every time it is queried, to be sure the result is fresh"""
        # jsonfile = Path(self.fpath, 'contents.json')

        # Get from git repo instead
        # :drawings: walletjson/2022/2022#01/contents.json
        # fpath = /mnt/d/EXPO/expofiles/surveyscans/1999/1999#02
        fp = Path(self.fpath)
        wname = fp.name
        wyear = fp.parent.name
        wurl = f"/walletedit/{self.walletname}"  # .replace('#', ':')

        if len(wyear) != 4 or len(wname) !=6: 
            # no contents.json for old-style wallets
            return None

        jsonfile = Path(settings.DRAWINGS_DATA, "walletjson") / wyear / wname / "contents.json"
        if not Path(jsonfile).is_file():
            print(f'{jsonfile} is not a file {wyear=} {wname=} ')
            return None
        else:
            with open(jsonfile) as json_f:
                try:
                    waldata = json.load(json_f)
                except:
                    message = f"! {str(self.walletname)} Failed to load {jsonfile} JSON file"
                    # print(message)
                    raise
                if waldata["date"]:
                    datestr = waldata["date"].replace(".", "-")
                    try:
                        thisdate = datetime.date.fromisoformat(datestr)
                    except ValueError:
                        # probably a single digit day number. HACKUS MAXIMUS.
                        # clearly we need to fix this when we first import date strings..
                        datestr = datestr[:-1] + "0" + datestr[-1]
                        print(f" - {datestr=} ")
                        try:
                            thisdate = datetime.date.fromisoformat(datestr)
                            self.walletdate = thisdate
                            self.save()
                            try:
                                waldata["date"] = thisdate.isoformat()
                            except:
                                message = f"! {str(self.walletname)} Date formatting failure {thisdate}. Failed to load from {jsonfile} JSON file"
                                from troggle.core.models.troggle import DataIssue

                                DataIssue.objects.update_or_create(parser="scans", message=message, url=wurl)
                        except:
                            message = f"! {str(self.walletname)} Date format not ISO {datestr}. Failed to load from {jsonfile} JSON file"
                            from troggle.core.models.troggle import DataIssue

                            DataIssue.objects.update_or_create(parser="scans", message=message, url=wurl)
        return waldata

    def year(self):
        """This gets the year syntactically without opening and reading the JSON"""
        if len(self.walletname) < 5:
            return None
        if self.walletname[4] != "#":
            return None
        year = int(self.walletname[0:4])
        ymin, ymax = YEAR_RANGE
        if year < ymin or year > ymax:
            return None
        else:
            self.walletyear = datetime.date(year, 1, 1)
            self.save()
            return str(year)

    # Yes this is horribly, horribly inefficient, esp. for a page that have date, people and cave in it
    def date(self):
        """Reads all the JSON data just to get the JSON date."""
        if self.walletdate:
            return self.walletdate
        if not (jsondata := self.get_json()): # WALRUS
            return None

        datestr = jsondata["date"]
        if not datestr:
            return None
        else:
            datestr = datestr.replace(".", "-")
            try:
                samedate = datetime.date.fromisoformat(datestr)
                self.walletdate = samedate.isoformat()
            except:
                try:
                    samedate = datetime.date.fromisoformat(datestr[:10])
                    self.walletdate = samedate.isoformat()
                except:
                    samedate = None
            self.save()
            return self.walletdate

    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)  # does nowt as fpath is a rooted path already
        files = []
        if not self.fpath:
            files.append(f"Incorrect path to wallet contents: '{self.fpath}'")
            return files
        if not dirpath.is_dir():
            files.append(f"Incorrect path to wallet contents: '{self.fpath}'")
            return files
        else:
            try:
                for f in dirpath.iterdir():
                    if f.is_file():
                        files.append(Path(f.name).stem)
                    else:
                        files.append(f"-{Path(f.name).stem}-")
            except FileNotFoundError:
                files.append("FileNotFoundError")
                pass
        return files

    def fixsurvextick(self, tick):
        blocks = self.survexblock_set.all()
        # blocks = SurvexBlock.objects.filter(scanswallet = self)
        result = tick
        for b in blocks:
            if b.survexfile:  # if any exist in db, no check for validity or a real file. Refactor.
                result = "seagreen"  #  slightly different shade of green
        return result

    def get_ticks(self):
        """Reads all the JSON data and sets the colour of the completion tick for each condition"""
        ticks = {}
        waldata = self.get_json()
        if not waldata:
            ticks["S"] = "darkgrey"
            ticks["C"] = "darkgrey"
            ticks["Q"] = "darkgrey"
            ticks["N"] = "darkgrey"
            ticks["P"] = "darkgrey"
            ticks["E"] = "darkgrey"
            ticks["T"] = "darkgrey"
            ticks["W"] = "darkgrey"
            return ticks
        ticks = {}

        # Initially, are there any required survex files present ?
        # Note that we can't set the survexblock here on the wallet as that info is only available while parsing the survex file
        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"] = "purple"
                for sx in waldata["survex file"]:
                    # this logic appears in several places, inc uploads.py). Refactor.
                    if sx != "":
                        if Path(sx).suffix.lower() != ".svx":
                            sx = sx + ".svx"
                        if (Path(settings.SURVEX_DATA) / sx).is_file():
                            ngood += 1
                        else:
                            nbad += 1
                if nbad == 0 and ngood >= 1: # all valid
                    ticks["S"] = "green"
                elif nbad >= 1 and ngood >= 1: # some valid, some invalid
                    ticks["S"] = "orange"
                elif nbad >= 1 and ngood == 0: # all bad
                    ticks["S"] = "red"
                elif nbad == 0 and ngood == 0: # list of blank strings
                    ticks["S"] = "red"
                else:
                    ticks["S"] = "fuchsia" # have fun working out what this means

        # 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
        if not self.year():
            ticks["Q"] = "darkgrey"
        else:
            if int(self.year()) < 2015:
                ticks["Q"] = "lightgrey"

        if 'notes not required' not in waldata:
            waldata['notes not required'] = False

        # 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()

            # 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)
            notes_required = not (notes_scanned or waldata["notes not required"])
            if notes_required:
                ticks["N"] = "red"
            else:
                ticks["N"] = "green"
            # print(f"{self.walletname} {ticks['N'].upper()} {notes_scanned=} {notes_required=} {waldata['notes not required']=}")
 
            # 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)]"