from flask import current_app, g
from flask_security import UserMixin, RoleMixin
import sqlalchemy
from typing import Union, Optional, Literal, Type, List, Tuple
import random
from sqlalchemy import Column, JSON, String, Integer, create_engine, ForeignKey, func, ARRAY, Boolean, UnicodeText, \
    DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.orm import sessionmaker, relationship, scoped_session


def get_scoped_session():
    engine = create_engine(current_app.config["DB_URL"])
    session_factory = sessionmaker(bind=engine)
    Base.query = scoped_session(session_factory).query_property()  # This is for compatibility with Flask-Security-Too which assumes usage of Flask-Sqlalchemy
    return scoped_session(session_factory)


def get_session() -> sqlalchemy.orm.session.Session:
    if "session" not in g:
        Session = get_scoped_session()
        Session.query_property()
        g.session = Session()

    return g.session


def init_db():
    engine = create_engine(current_app.config["DB_URL"])
    Base.metadata.create_all(engine)


Base = declarative_base()


class User(Base, UserMixin):
    __tablename__ = "users"
    user_id = Column(Integer, primary_key=True)
    email = Column(String, unique=True, nullable=False)
    username = Column(String, unique=True)
    password = Column(String, nullable=False)
    active = Column(Boolean, nullable=False)
    last_login_at = Column(DateTime())
    current_login_at = Column(DateTime())
    last_login_ip = Column(String(100))
    current_login_ip = Column(String(100))
    login_count = Column(Integer)
    fs_uniquifier = Column(String, unique=True, nullable=False)
    roles = relationship("Role", secondary="users_roles")


class Role(Base, RoleMixin):
    __tablename__ = "roles"
    role_id = Column(Integer, primary_key=True)
    name = Column(String, unique=True)
    description = Column(String)
    permissions = Column(UnicodeText)


class UsersRoles(Base):
    __tablename__ = "users_roles"
    user_role_id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.user_id"))
    role_id = Column(Integer, ForeignKey("roles.role_id"))


class AllQuestions(Base):
    __tablename__ = "all_questions"

    question_id = Column(Integer, primary_key=True, nullable=False)
    question_text = Column(String)
    answer = Column(String)
    addresses = Column(String)

    multiple_choice = relationship("MultipleChoice", uselist=False, back_populates="all_question_relationship")
    hidden_answer = relationship("HiddenAnswer", uselist=False, back_populates="all_question_relationship")

    def __init__(self, question_id, question, answer, addresses):
        self.question_id = question_id
        self.question_text = question
        self.answer = answer
        self.addresses = addresses

    def __repr__(self):
        return f"<Question: {self.question_id}>"

    def get_dict(self):
        result = {
            "question_id": self.question_id,
            "question": self.question_text,
            "answer": self.answer,
            "addresses": self.addresses,
        }
        if self.hidden_answer:
            result["hidden_answer"] = self.hidden_answer.get_dict()
        if self.multiple_choice:
            result["multiple_choice"] = self.multiple_choice.get_dict()
        return result


class HiddenAnswer(Base):
    __tablename__ = "category_hidden_answer"

    question_id = Column(Integer, ForeignKey("all_questions.question_id"), primary_key=True)
    hidden_answer_difficulty = Column(Integer)
    hidden_answer_hint = Column(JSON)

    all_question_relationship = relationship("AllQuestions", lazy="joined", back_populates="hidden_answer")
    question_text = association_proxy("all_question_relationship", "question_text")
    answer = association_proxy("all_question_relationship", "answer")
    addresses = association_proxy("all_question_relationship", "addresses")

    def __init__(self, question_id, difficulty, hint, base_question):
        self.question_id = question_id
        self.hidden_answer_difficulty = difficulty
        self.hidden_answer_hint = hint
        self.all_question_relationship = base_question

    def __repr__(self):
        return f"<Question Hidden Answer: {self.question_id}>"

    def get_dict(self):
        return {
            "question_id": self.question_id,
            "difficulty": self.hidden_answer_difficulty,
            "hint": self.hidden_answer_hint,
        }


class MultipleChoice(Base):
    __tablename__ = "category_multiple_choice"

    question_id = Column(Integer, ForeignKey("all_questions.question_id"), primary_key=True)
    multiple_choice_difficulty = Column(Integer)
    multiple_choice_hint = Column(JSON)
    wrong_answers = Column(ARRAY(String))

    all_question_relationship = relationship("AllQuestions", lazy="joined", back_populates="multiple_choice")
    question_text = association_proxy("all_question_relationship", "question_text")
    answer = association_proxy("all_question_relationship", "answer")
    addresses = association_proxy("all_question_relationship", "addresses")

    def __init__(self, question_id, difficulty, hint, wrong_answers, base_question):
        self.question_id = question_id
        self.multiple_choice_difficulty = difficulty
        self.multiple_choice_hint = hint
        self.wrong_answers = wrong_answers
        self.all_question_relationship = base_question
        self.answer_list = None

    def randomize_answer_list(self):
        answer_list: List[str] = [*self.wrong_answers, self.answer]
        random.shuffle(answer_list)
        self.answer_list = answer_list

    def __repr__(self):
        return f"<Question Multiple Choice: {self.question_id}>"

    def get_dict(self):
        return {
            "question_id": self.question_id,
            "difficulty": self.multiple_choice_difficulty,
            "hint": self.multiple_choice_hint,
            "wrong_answers": self.wrong_answers,
        }


def add_multiple_choice_question(question, answer, addresses, difficulty, hint, wrong_answers):
    session = get_session()
    question_id = session.query(AllQuestions).count()
    base_question = AllQuestions(question_id, question, answer, addresses)
    multiple_choice_question = MultipleChoice(question_id, difficulty, hint, wrong_answers, base_question)
    session.add(base_question)
    session.add(multiple_choice_question)
    session.commit()


def get_all_questions() -> List[AllQuestions]:
    session = get_session()
    return session.query(AllQuestions).all()


def get_all_hidden_answer() -> List[HiddenAnswer]:
    session = get_session()
    return session.query(HiddenAnswer).all()


def get_all_multiple_choice() -> List[MultipleChoice]:
    session = get_session()
    return session.query(MultipleChoice).all()


def get_category_count(category: Union[Type[MultipleChoice], Type[HiddenAnswer], Type[AllQuestions]]) -> int:
    session = get_session()
    return session.query(category).count()


def get_question(category: Union[Type[MultipleChoice], Type[HiddenAnswer], Type[AllQuestions]], question_id: int) -> \
Optional[Union[MultipleChoice, HiddenAnswer, AllQuestions]]:
    session = get_session()
    return session.query(category).filter(category.question_id == question_id).one_or_none()


def get_random_question_of_difficulty(category: Union[Type[MultipleChoice], Type[HiddenAnswer]],
                                      difficulty: Literal[1, 2, 3]):
    session = get_session()
    return session.query(category).filter(category.hidden_answer_difficulty == difficulty).order_by(func.random()).first()


def get_random_hidden_answer(difficulty: Optional[Literal[1, 2, 3]] = None) -> HiddenAnswer:
    session = get_session()
    if difficulty is not None:
        return session.query(HiddenAnswer).filter(HiddenAnswer.hidden_answer_difficulty == difficulty).order_by(func.random()).first()
    return session.query(HiddenAnswer).order_by(func.random()).first()


def get_random_multiple_choice(difficulty: Optional[Literal[1, 2, 3]] = None) -> MultipleChoice:
    session = get_session()
    if difficulty is not None:
        return session.query(MultipleChoice).filter(MultipleChoice.multiple_choice_difficulty == difficulty).order_by(
            func.random()).first()
    return session.query(MultipleChoice).order_by(func.random()).first()


def check_answer(question_id: int, guess: str) -> Tuple[bool, str]:
    session = get_session()
    question: AllQuestions = session.query(AllQuestions).filter(AllQuestions.question_id == question_id).one_or_none()
    if question:
        answer = question.answer
        return answer == guess, answer


def query_all_questions(offset, limit, query: dict = None, sort=None, order=None) -> Tuple[List[AllQuestions], int]:
    session = get_session()
    query_params = []
    if query is not None:
        for key in query.keys():
            if key == "multiple_choice" or key == "hidden_answer":
                if query[key]:
                    query_params.append(getattr(AllQuestions, key) != None)
                else:
                    query_params.append(getattr(AllQuestions, key) == None)
            else:
                query_params.append(getattr(AllQuestions, key).ilike("%" + query[key] + "%"))
    order_by = None
    if sort and order:
        order_by = getattr(getattr(AllQuestions, sort), order)()
    q = session.query(AllQuestions).filter(*query_params).order_by(order_by)
    questions = q.offset(offset).limit(limit).all()
    count = q.count()
    return questions, count


def update_question(question_id, data):
    session = get_session()
    question: AllQuestions = session.query(AllQuestions).get(question_id)
    for column in data.keys():
        if column in AllQuestions.__table__.columns:
            setattr(question, column, data[column])
        if column in MultipleChoice.__table__.columns:
            setattr(question.multiple_choice, column, data[column])
        if column in HiddenAnswer.__table__.columns:
            setattr(question.hidden_answer, column, data[column])
    session.commit()