# from tinymce.widgets import TinyMCE
import re

import django.forms as forms
from django.core.exceptions import ValidationError
from django.forms import ModelForm
from django.forms.models import modelformset_factory

from troggle.core.models.caves import Cave, CaveAndEntrance, Entrance
from troggle.core.views.editor_helpers import HTMLarea

"""These are all the class-based Forms used by troggle.
There are other, simpler, upload forms in view/uploads.py

class-based forms are quicker to set up (for Django experts) but
are more difficult to maintain (or even begin to understand) by non-Django experts.

Notes to self, as I try to work out what the hell is going on:

Note that HTMLarea invokes a widget which sets a CSS class which calls javascript in 
templates/html_editor_scripts_css.html - which imports jquery and codemirror directly, without
declaring it anywhere or locally installing it. (!)

Django handles three distinct parts of the work involved in forms:
- preparing and restructuring data to make it ready for rendering
- creating HTML forms for the data
- receiving and processing submitted forms and data from the client
It is possible to write code that does all of this manually, but Django can take care of it all for you.

READ https://docs.djangoproject.com/en/5.1/topics/forms/ and thoroughly digest it, also:
https://pythontimes.com/django-forms-deep-dive-advanced-techniques-for-form-handling/
https://docs.djangoproject.com/en/5.1/ref/forms/models/
https://stackoverflow.com/questions/53035151/django-formset-factory-vs-modelformset-factory-vs-inlineformset-factory
https://micropyramid.com/blog/understanding-djangos-model-formsets-in-detail-and-their-advanced-usage
https://www.geeksforgeeks.org/django-modelformsets/
https://www.codeunderscored.com/model-formsets-in-django/
https://django-formset.fly.dev/styling/
"""

todo = """
"""


class CaveForm(ModelForm):
    """Only those fields for which we want to override defaults are listed here
    the other fields of the class Cave are present on the form, but use the default presentation style
    Extra fields, not in the model Cave, are also created here, e.g. who_are_you
    
    see https://docs.djangoproject.com/en/5.1/topics/forms/modelforms/
    """
    unofficial_number= forms.CharField(required=False, 
        label="Unofficial Number used to construct internal identifiers",
        widget=forms.TextInput(
        attrs={"size": "45", "placeholder": "2035-ZB-03"}))
    
    official_name = forms.CharField(required=False, 
        label="Name:",widget=forms.TextInput(
        attrs={"size": "45", "placeholder": "ideally official name in German, but any name is OK"}))
    
    underground_description = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    explorers = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    equipment = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    survey = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    # survey = forms.CharField(required = False, widget=TinyMCE(attrs={'cols': 80, 'rows': 10}))
    # kataster_status = forms.CharField(required=False, 
        # label = "Kataster status, see below",
        # widget=forms.TextInput(attrs={"placeholder": "see example below"})
    # )
    kataster_code = forms.CharField(required=False, 
        label = "Kataster code, see explanation at bottom of page",
        widget=forms.TextInput(attrs={"placeholder": "e.g. 2/S=  See below"})
    )
    # underground_centre_line = forms.CharField(
        # required=False,
        # widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    # )
    notes = forms.CharField(
        required=False,
        label = "Notes, e.g. progress on issuing kataster no.",
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    references = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter page content (using HTML)"}),
    )
    description_file = forms.CharField(required=False, label="Path of top-level description file for this cave, when a separate file is used. Otherwise blank.", widget=forms.TextInput(attrs={"size": "45","placeholder": "usually blank"}), help_text="")
    survex_file = forms.CharField(
        required=False, label="Survex file eg. caves-1623/000/000.svx", widget=forms.TextInput(attrs={"size": "45"})
    )
    length = forms.CharField(required=False, label="Length (m)", widget=forms.TextInput(attrs={"placeholder": "usually blank"}))
    depth = forms.CharField(required=False, label="Depth (m)", widget=forms.TextInput(attrs={"placeholder": "usually blank"}))
    extent = forms.CharField(required=False, label="Extent (m)", widget=forms.TextInput(attrs={"placeholder": "usually blank"}))
    areacode = forms.CharField(required=False, label="Area code", widget=forms.TextInput(attrs={"placeholder": "e.g. 1623"}))
    subarea = forms.CharField(required=False, label="Subarea (do not use for new caves)", widget=forms.TextInput(attrs={"placeholder": "usually blank, archaic"}))
   
    #cave_slug = forms.CharField()
    identified_login = forms.BooleanField(required=False,widget=forms.CheckboxInput(attrs={"onclick":"return false"})) # makes it readonly
    who_are_you = forms.CharField(
        widget=forms.TextInput(
            attrs={"size":  100, "placeholder": "You are editing this page,  who are you ? e.g. 'Becka' or 'Animal <mta@gasthof.expo>'", 
            "style": "vertical-align: text-top;"}
        )
    )
    class Meta:
        model = Cave
        exclude = ("filename", "url", "underground_centre_line", "kataster_status")
       
    field_order = ['unofficial_number', 'kataster_number', 'official_name', 'underground_description', 'survey', 
        'underground_centre_line', 'explorers', 'equipment', 'notes', 'references', 'description_file', 'survex_file', 
        'areacode', 'subarea', 'length', 'depth', 'extent',
        'kataster_code', 'kataster_status', 'fully_explored', 'non_public', 'identified_login', 'who_are_you']
   
    def clean_cave_slug(self):
        if self.cleaned_data["cave_slug"] == "":
            myArea = self.cleaned_data["areacode"]
            if self.data["kataster_number"]:
                cave_slug = f"{myArea}-{self.cleaned_data['kataster_number']}"
            else:
                cave_slug = f"{myArea}-{self.cleaned_data['unofficial_number']}"
        else:
            cave_slug = self.cleaned_data["cave_slug"]
	# Converting a PENDING cave to a real cave by saving this form
        print("EEE", cave_slug.replace("-PENDING-", "-"))
        return cave_slug.replace("-PENDING-", "-")
            
    
    def clean(self):
        cleaned_data = super(CaveForm, self).clean() # where is this code hidden? How does this work??
        if self.data.get("kataster_number") == "" and self.data.get("unofficial_number") == "":
            self._errors["unofficial_number"] = self.error_class(
                ["Either the kataster or unoffical number is required."]
            )
        #        if self.cleaned_data.get("kataster_number") != "" and self.cleaned_data.get("official_name") == "":
        #            self._errors["official_name"] = self.error_class(["This field is required when there is a kataster number."])
        # if cleaned_data.get("url") == []:
            # self._errors["url"] = self.error_class(["This field is required."])
        # if cleaned_data.get("url") and cleaned_data.get("url").startswith("/"):
            # self._errors["url"] = self.error_class(["This field cannot start with a /."])
        return cleaned_data


class EntranceForm(ModelForm):
    """Only those fields for which we want to override defaults are listed here
    the other fields are present on the form, but use the default presentation style
    
    see https://docs.djangoproject.com/en/5.1/topics/forms/modelforms/
    """

    name = forms.CharField(required=False, widget=forms.TextInput(attrs={"size": "45", "placeholder": "usually leave this blank"}))
    entrance_description = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    )
    explorers = forms.CharField(required=False, widget=forms.TextInput(attrs={"size": "45"}))
    # explorers = forms.CharField(required = False, widget=TinyMCE(attrs={'cols': 80, 'rows': 10}))
    # map_description = forms.CharField(
        # label="Map (is this used?)",
        # required=False,
        # widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    # )
    location_description = forms.CharField(
        label="Location",
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    )
    lastvisit = forms.CharField(
        required=False, widget=forms.TextInput(attrs={"size": "10"}), label="Last visit date, e.g. 2023-07-11"
    )
    approach = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    )
    underground_description = forms.CharField(
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    )
    photo = forms.CharField(
        label="Photos (use 'image' button)",

        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Use button on right to add HTML link"}),
    )
    marking_comment = forms.CharField(
        label="Marking text",
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter exact tag text, e.g. 'CUCC 2035 ZB-03'"}),
    )
    findability_description = forms.CharField(
        required=False,
        label="How to find it",
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Enter text (using HTML)"}),
    )
    other_description = forms.CharField(
        label="Other comments",
        required=False,
        widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Usually blank"}),
    )
    # bearings = forms.CharField(
        # label="Bearings (obsolete)",
        # required=False,
        # widget=HTMLarea(attrs={"height": "80%", "rows": 20, "placeholder": "Usually blank"}),
    # )
    tag_station = forms.CharField(
        required=False,
        widget=forms.TextInput(attrs={"size": "50","placeholder": "e.g. 1623.t2035-zb-03a"}), 
        label="Tag station: Survex station id, e.g. 1623.p2023-aa-01"
    )
    other_station = forms.CharField(
        required=False,
        widget=forms.TextInput(attrs={"size": "50","placeholder": "e.g. 1623.p2035-zb-03c"}), 
        label="Other station: Survex station id, e.g. 1623.gps2018-aa-01"
    )

    lat_wgs84 = forms.CharField(
        required=False, widget=forms.TextInput(attrs={"size": "10","placeholder": "e.g. 47.123456"}), 
        label="Latitude (WSG84) - if no other location"
        )
    long_wgs84 = forms.CharField(
        required=False, widget=forms.TextInput(attrs={"size": "10","placeholder": "e.g. 13.123456"}), 
        label="Longitude (WSG84) - if no other location"
        )
    alt = forms.CharField(required=False, label="Altitude (m) - from GPS if you have it, but let it settle.")
    # url = forms.CharField(required=False, label="URL [usually blank]", widget=forms.TextInput(attrs={"size": "45"}))
    identified_login = forms.BooleanField(required=False,widget=forms.CheckboxInput(attrs={"onclick":"return false"})) # makes it readonly
    who_are_you = forms.CharField(
        widget=forms.TextInput(
            attrs={"size":  100, "placeholder": "You are editing this page,  who are you ? e.g. 'Becka' or 'Animal <mta@gasthof.expo>'", 
            "style": "vertical-align: text-top;"}
        )
    )
    
    field_order = ['name', 'entrance_description', 'explorers', 'map_description', 'location_description', 'lastvisit', 'non_public',
    'findability', 'marking', 'approach', 'underground_description', 'photo', 'marking_comment', 'findability_description', 'other_description', 
    'bearings', 'tag_station', 'other_station',  'easting', 'northing', 'lat_wgs84', 'long_wgs84', 'alt',  'identified_login', 'who_are_you']

    class Meta:
        model = Entrance
        exclude = (
            "cached_primary_slug",
            "map_description", # No entrance has any data on this field, so it is being retired.
            "filename",
            "slug",
            "bearings"
        )

    def clean(self):
        # if self.cleaned_data.get("url"): # can remove this as the  form does not have a url field any more, which was never used anyway
            # if self.cleaned_data.get("url").startswith("/"):
                # self._errors["url"] = self.error_class(["This field cannot start with a /."])
        return self.cleaned_data


# # This next line is sufficient to create an entire entry for for the cave fields automatically
# # for forms which map directly onto a Django Model
# CaveAndEntranceFormSet = modelformset_factory(CaveAndEntrance, exclude=("cave",))
# # This is used only in templates/editcave.html which is called only to edit caves in core/views/cave.py

class EntranceLetterForm(ModelForm):
    """Form to link entrances to caves, along with an entrance number.

    NOTE. The relationship between caves and entrances was originally designed to be a many to many relationship.
    With entrances gaining new caves and letters when caves are joined.
    However, so far as I can see, this was never actually done in practice on Expo and each Entrance belongs
    to only one Cave.
    
    see https://docs.djangoproject.com/en/5.1/topics/forms/modelforms/
    
    To be re-written when we move the 'letter' field into Entrance
    """
    
    # This only needs to be required=True for the second and subsequent entrances, not the first. Tricky.
    entranceletter = forms.CharField(required=False, widget=forms.TextInput(attrs={"size": "2"}))

    class Meta:
        model = CaveAndEntrance
        exclude = ("cave", "entrance")

    def full_clean(self):
        super(EntranceLetterForm, self).full_clean()
        try:
            self.instance.validate_unique()
        except forms.ValidationError as e:
            self._update_errors(e)