from ..extensions import db, mail
from ..tools.encryption import decrypt, encrypt
from ..tools.logs import write
from .test import Test

from flask_login import current_user
from flask_mail import Message
from sqlalchemy_json import MutableJson

from datetime import datetime, timedelta
from uuid import uuid4

class Entry(db.Model):

    id = db.Column(db.String(36), primary_key=True)
    first_name = db.Column(db.String(128), nullable=False)
    surname = db.Column(db.String(128), nullable=False)
    email = db.Column(db.String(128), nullable=False)
    club = db.Column(db.String(128), nullable=True)
    test_id = db.Column(db.String(36), db.ForeignKey('test.id'))
    user_code = db.Column(db.String(6), nullable=True)
    start_time = db.Column(db.DateTime, nullable=True)
    end_time = db.Column(db.DateTime, nullable=True)
    status = db.Column(db.String(16), nullable=True)
    valid = db.Column(db.Boolean, default=True, nullable=True)
    answers = db.Column(MutableJson, nullable=True)
    result = db.Column(MutableJson, nullable=True)
    
    def __repr__(self):
        return f'<New entry by {self.first_name} {self.surname}> was added with <id {self.id}>.'

    @property
    def generate_id(self): raise AttributeError('generate_id is not a readable attribute.')

    generate_id.setter
    def generate_id(self): self.id = uuid4().hex

    @property
    def set_first_name(self): raise AttributeError('set_first_name is not a readable attribute.')

    set_first_name.setter
    def set_first_name(self, name:str): self.first_name = encrypt(name)

    def get_first_name(self): return decrypt(self.first_name)

    @property
    def set_surname(self): raise AttributeError('set_first_name is not a readable attribute.')

    set_surname.setter
    def set_surname(self, name:str): self.surname = encrypt(name)

    def get_surname(self): return decrypt(self.surname)

    @property
    def set_email(self): raise AttributeError('set_email is not a readable attribute.')

    set_email.setter
    def set_email(self, email:str): self.email = encrypt(email)

    def get_email(self): return decrypt(self.email)

    @property
    def set_club(self): raise AttributeError('set_club is not a readable attribute.')

    set_club.setter
    def set_club(self, club:str): self.club = encrypt(club)

    def get_club(self): return decrypt(self.club)

    def ready(self):
        self.generate_id()
        try:
            db.session.add(self)
            db.session.commit()
        except Exception as exception:
            db.session.rollback()
            write('system.log', f'Database error when preparing new entry for {self.get_surname()}, {self.get_first_name()}: {exception}')
            return False, f'Database error: {exception}'
        write('tests.log', f'New test ready for {self.get_surname()}, {self.get_first_name()} with id {self.id}.')
        return True, f'Test ready.'

    def start(self):
        self.start_time = datetime.now()
        self.status = 'started'
        try: db.session.commit()
        except Exception as exception:
            db.session.rollback()
            write('system.log', f'Database error when starting test for {self.get_surname()}, {self.get_first_name()}: {exception}')
            return False, f'Database error: {exception}'
        write('tests.log', f'Test started by {self.get_surname()}, {self.get_first_name()} with id {self.id}.')
        return True, f'New test started with id {self.id}.'

    def complete(self, answers:dict=None, result:dict=None):
        self.end_time = datetime.now()
        self.answers = answers
        self.result = result
        delta = timedelta(minutes=int(0 if self.test.time_limit is None else self.test.time_limit)+1)
        if not self.test.time_limit or self.end_time <= self.start_time + delta:
            self.status = 'completed'
            self.valid = True
        else:
            self.status = 'late'
            self.valid = False
        try: db.session.commit()
        except Exception as exception:
            db.session.rollback()
            write('system.log', f'Database error when submitting entry for {self.get_surname()}, {self.get_first_name()}: {exception}')
            return False, f'Database error: {exception}'
        write('tests.log', f'Test completed by {self.get_surname()}, {self.get_first_name()} with id {self.id}.')
        return True, f'Test entry completed for id {self.id}.'

    def validate(self):
        if self.valid: return False, f'The entry is already valid.'
        if self.status == 'started': return False, 'The entry is still pending.'
        self.valid = True
        self.status = 'completed'
        try: db.session.commit()
        except Exception as exception:
            db.session.rollback()
            write('system.log', f'Database error when validating entry {self.id}: {exception}')
            return False, f'Database error: {exception}'
        write('system.log', f'The entry {self.id} has been validated by {current_user.get_username()}.')
        return True, f'The entry {self.id} has been validated.'

    def delete(self):
        id = self.id
        name = f'{self.get_first_name()} {self.get_surname()}'
        try:
            db.session.delete(self)
            db.session.commit()
        except Exception as exception:
            db.session.rollback()
            write('system.log', f'Database error when deleting entry {id}: {exception}')
            return False, f'Database error: {exception}'
        write('system.log', f'The entry {id} by {name} has been deleted by {current_user.get_username()}.')
        return True, 'Entry deleted.'
    
    def notify_result(self):
        score = round(100*self.result['score']/self.result['max'])
        tags_low = { tag: tag_result['max'] - tag_result['scored'] for tag, tag_result in self.result['tags'].items() }
        sorted_low_tags = sorted(tags_low.items(), key=lambda x: x[1], reverse=True)
        tag_output = [ tag[0] for tag in sorted_low_tags[0:3] if tag[1] > 3]
        revision_plain = ''
        revision_html = ''
        if self.result['grade'] == 'pass':
            flavour_text = """Well done on successfully completing the refereeing theory exam. We really appreciate members of our community taking the time to get qualified to referee.
            """
        elif self.result['grade'] == 'merit':
            flavour_text = """Congratulations on achieving a merit in the refereeing exam. We are delighted that members of our community work so hard with refereeing.
            """
        elif self.result['grade'] == 'fail':
            flavour_text = """Unfortunately, you were not successful in passing the theory exam in this attempt. We hope that this does not dissuade you, and that you try again in the future.
            """
            revision_plain = f"""Based on your answers, we would also suggest you brush up on the following topics for your next attempt:\n\n
                {','.join(tag_output)}\n\n
            """
            revision_html = f"""<p>Based on your answers, we would also suggest you brush up on the following topics for your next attempt:</p>
                <ul>
                <li>{'</li><li>'.join(tag_output)}</li>
                </ul>
            """
        email = Message(
            subject='RefTest | SKA Refereeing Theory Exam Results',
            recipients=[self.get_email()],
            body=f"""
            SKA Refereeing Theory Exam
            Candidate Results
            Dear {self.get_first_name()},
            This email is to confirm that you have taken the SKA Refereeing Theory Exam. Your submission has been evaluated and your results are as follows:
            {self.get_surname()}, {self.get_first_name()}
            Email Address: {self.get_email()}
            {f'Club: {self.get_club()}' if self.club else ''}
            Date of Exam: {self.end_time.strftime('%d %b %Y')}
            Score: {score}%
            Grade: {self.result['grade']}
            {flavour_text}
            {revision_plain}
            Thank you for taking the time to become a qualified referee.
            Best wishes,
            SKA Refereeing
            """,
            html=f"""
            <h1>SKA Refereeing Theory Exam</h1>
            <h2>Candidate Results</h2>
            <p>Dear {self.get_first_name()},</p>
            <p>This email is to confirm that you have taken the SKA Refereeing Theory Exam. Your submission has been evaluated and your results are as follows:</p>
            <h3>{self.get_surname()}, {self.get_first_name()}</h3>
            <p><strong>Email Address</strong>: {self.get_email()}</p>
            {f'<p><strong>Club</strong>: {self.get_club()}</p>' if self.club else ''}
            <h1>{score}%</h1>
            <h2>{self.result['grade']}</h2>
            <p>{flavour_text}</p>
            {revision_html}
            <p>Thank you for taking the time to become a qualified referee.</p>
            <p>Have a nice day!</p>
            <p>Best wishes, <br/> SKA Refereeing</p>
            """
        )
        try: mail.send(email)
        except Exception as exception: write('system.log', f'SMTP Error when trying to notify results to {self.get_surname()}, {self.get_first_name()} with error: {exception}')