from flask import redirect, url_for
from flask_wtf import FlaskForm
from flask_wtf.file import FileAllowed
from wtforms import StringField, SubmitField, FileField, TextAreaField, RadioField, SelectMultipleField, widgets, FieldList, FormField, HiddenField
from wtforms.validators import DataRequired, Regexp, Optional, ValidationError
from wtforms_alchemy import model_form_factory, ClassMap
from wtforms_alchemy.fields import QuerySelectMultipleField
from sqlalchemy_utils import ChoiceType
from app import db
import app.models as models

import yaml
import os
import re

REPERTOIRE_YAML = "./export/"

if not os.path.exists(REPERTOIRE_YAML):
    os.makedirs(REPERTOIRE_YAML)

categorie_liste = ["saes","ressources","acs"]
categorie_to_model = {"saes": "SAE", "ressources": "Ressource", "acs": "AC"}
separateur = None

BaseModelForm = model_form_factory(FlaskForm, include_primary_keys=True)

class ModelForm(BaseModelForm):
    @classmethod
    def get_session(self):
        return db.session

class RefListField(QuerySelectMultipleField):
    option_widget=widgets.CheckboxInput()

class AccueilForm(FlaskForm):
    ajouter = SubmitField("Ajouter")
    reset = SubmitField("Reset")
    exporter = SubmitField("Exporter")
    importer = SubmitField("Importer")

class CoefForm(FlaskForm):
    objetformation = HiddenField("Objet de formation")
    coef = StringField("Coef")

class UEForm(FlaskForm):
    ue = HiddenField("Competence")
    acs = RefListField("Liste des ACs", query_factory=lambda: models.AC.query.all(), get_label=lambda ref: ref.getLabel())
    ressources = RefListField("Liste des Ressources inclus dans les ACs", query_factory=lambda: [], get_label=lambda ref: ref.getLabel())
    saes = RefListField("Liste des SAEs inclus dans les ACs", query_factory=lambda: [], get_label=lambda ref: ref.getLabel())
    coef = FieldList(FormField(CoefForm))

class SemestreForm(FlaskForm):
    ues = RefListField("Liste des UEs", query_factory=lambda: models.Competence.query.all(), get_label=lambda ref: ref.getLabel())
    ueform = FieldList(FormField(UEForm))
    update = SubmitField("Update")

class Form(ModelForm):
    class Meta:
        not_null_validator_type_map = ClassMap({db.String: [DataRequired()]})

    sauvegarder = SubmitField("Sauvegarder")
    charger = SubmitField("Charger")
    supprimer = SubmitField("Supprimer")
    exporter = SubmitField("Exporter")
    fichier = FileField("Choisir fichier", validators=[FileAllowed(["yml"], "Fichier Yaml seulement!")])
    importer = SubmitField("Importer")
    referentiel = RadioField("Liste des référentiels", validators=[Optional()])

    def chargerRef(self):
        if self.referentiel.data == None:
            self.referentiel.errors.append("Aucun référentiel n'a été selectionné!")
            return False
        else:
            return True
                
    def chargerBDD(self, referentiel):
        for categorie in list(self.data.keys())[7:-1]:
            self[categorie].process_data(referentiel.__dict__[categorie])
        self.referentiel.process_data(referentiel)

    def importerRef(self):
        if len(self.fichier.errors) == 0:
            if self.fichier.data.filename == "":
                self.fichier.errors.append("Aucun fichier selectioné.")
                return
            if re.match(self.regex, self.fichier.data.filename[:-4]) == None:
                self.fichier.errors.append("Mauvais type de référentiel!")
                return
            fichier_Yaml = yaml.safe_load(self.fichier.data.read())
            for categorie, valeur in fichier_Yaml.items():
                if categorie in categorie_liste:
                    model = getattr(models, categorie_to_model[categorie])
                    self[categorie].process_data([model.query.filter_by(code=ref).first() for ref in valeur])
                else:
                    self[categorie].process_data(valeur)
            self.validate()
    
    def exporterRef(self):
        """ Exporte dans un fichier yaml les informations du formulaire rempli """
        output = {}
        for categorie, valeur in list(self.data.items())[7:-1]:
            if categorie in categorie_liste:
                output[categorie] = [ referentiel.code for referentiel in valeur ]
            else:
                output[categorie] = valeur
        fichier = REPERTOIRE_YAML + self.code.data + ".yml"
        with open(fichier, "w", encoding="utf8") as fid:
            fid.write(yaml.dump(output))
        print(yaml.dump(output))

    def supprimerRef(self):
        if self.referentiel.data == None:
            self.referentiel.erros.append("Aucun référentiel n'a été selectionné!")
            return False
        else:
            temp = self.referentiel.data[1:-1].split()
            model = getattr(models, temp[0])
            referentiel = model.query.filter_by(code=temp[1]).first()
            db.session.delete(referentiel)
            db.session.commit()
            return True

    def sauvegarderRef(self):
        model = getattr(models, self.__class__.__name__[:-4])
        referentiel = model.query.filter_by(code=self.code.data).first()
        if referentiel == None: referentiel = model() 
        self.populate_obj(referentiel)
        db.session.add(referentiel)
        db.session.commit()

class PNForm(Form):
    regex = "^PN\d$"

    class Meta:
        model = models.PN

    type = RadioField("Type", choices=["1","2","3"])
        

class ACForm(Form):
    regex = "^AC\d{4}$"

    class Meta:
        model = models.AC

    saes = RefListField("Liste des SAEs", query_factory=lambda: models.SAE.query.all(), get_label=lambda ref: ref.getLabel())
    ressources = RefListField("Liste des Ressources", query_factory=lambda: models.Ressource.query.all(), get_label=lambda ref: ref.getLabel())

class SAEForm(Form):
    regex = "^SAE\d{2}$"

    class Meta:
        model = models.SAE

    acs = RefListField("Liste des ACs", query_factory=lambda: models.AC.query.all(), get_label=lambda ref: ref.getLabel())
    ressources = RefListField("Liste des Ressources", query_factory=lambda: models.Ressource.query.all(), get_label=lambda ref: ref.getLabel())

class RessourceForm(Form):
    regex = "^R\d{3}$"

    class Meta:
        model = models.Ressource

    acs = RefListField("Liste des ACs", query_factory=lambda: models.AC.query.all(), get_label=lambda ref: ref.getLabel())
    saes = RefListField("Liste des SAEs", query_factory=lambda: models.SAE.query.all(), get_label=lambda ref: ref.getLabel())

class CompetenceForm(Form):
    regex = "^RT\d$"

    class Meta:
        model = models.Competence