from enum import Enum
from werkzeug.security import generate_password_hash, check_password_hash
from . import db, login
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.sql import func
from secrets import token_hex
from flask_login import UserMixin
import json
from json import JSONEncoder
from datetime import datetime
import pytz
from flask_moment import Moment

moment = Moment()

class Role(Enum):
    none = 0
    owner = 1
    hunter = 2
    bunny = 3

class GameState(Enum):
    initiated = 1
    published = 2
    started = 3
    interrupted = 4
    finished = 5

class GamePlayer(db.Model):
    __tablename__ = 'game_player'
    game_id = db.Column(db.Integer, db.ForeignKey('game.id'), primary_key=True, nullable=False)
    player_id = db.Column(db.Integer, db.ForeignKey('player.id'), primary_key=True, nullable=False)
    role = db.Column(db.Enum(Role), server_default=Role(0).name, nullable=False)
    game = db.relationship('Game', back_populates='game_players')
    player = db.relationship('Player', back_populates='player_games')

class PlayerFoundObjective(db.Model):
    __tablename__ = 'player_found_objective'
    objective_id = db.Column(db.Integer, db.ForeignKey('objective.id'), primary_key=True, nullable=False, server_default='-1')
    player_id = db.Column(db.Integer, db.ForeignKey('player.id'), primary_key=True, nullable=False, server_default='-1')
    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)
    player = db.relationship('Player', back_populates='player_found_objectives')
    objective = db.relationship('Objective', back_populates='objective_found_by')

class NotificationPlayer(db.Model):
    __tablename__ = 'notification_player'
    notification_id = db.Column(db.Integer, db.ForeignKey('notification.id'), primary_key=True, nullable=False)
    player_id= db.Column(db.Integer, db.ForeignKey('player.id'), primary_key=True, nullable=False)
    been_shown = db.Column(db.Boolean, server_default='True', nullable=False)
    notification = db.relationship('Notification', back_populates='notification_recipients')
    recipient = db.relationship('Player', back_populates='player_notifications')

class PlayerCaughtPlayer(db.Model):
    __tablename__ = 'player_caught_player'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True, server_default='-1')
    catching_player_id = db.Column(db.Integer, db.ForeignKey('player.id'), nullable=False)
    caught_player_id = db.Column(db.Integer, db.ForeignKey('player.id'), nullable=False)
    photo_reference = db.Column(db.String(128), unique=True, nullable=False)
    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)
    catching_player = db.relationship('Player', back_populates='player_caught_by_players', foreign_keys=[catching_player_id])
    caught_player = db.relationship('Player', back_populates='player_caught_players', foreign_keys=[caught_player_id])

class Game(db.Model):
    __tablename__ = 'game'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), index=True, unique=True, nullable=False)
    state = db.Column(db.Enum(GameState), server_default=GameState(1).name, nullable=False)
    start_time = db.Column(db.DateTime)
    end_time = db.Column(db.DateTime)
    game_players = db.relationship(
        'GamePlayer',
        back_populates='game',
        cascade="save-update, merge, delete, delete-orphan")
    players = association_proxy('game_players', 'player',
        creator=lambda player: GamePlayer(player=player)) # to enable game.players.append(player)
    objectives = db.relationship(
        'Objective',
        lazy='select',
        backref=db.backref('game', lazy='joined'))
    notifications = db.relationship(
        'Notification',
        lazy='select',
        backref=db.backref('game', lazy='joined'))

    def last_player_locations(self):
        return [player.last_location(self) for player in self.players if player.locations]

class Player(UserMixin, db.Model):
    """ !Always call set_auth_hash() after creating new instance! """
    __tablename__ = 'player'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True, nullable=False)
    auth_hash = db.Column(db.String(32), unique=True, nullable=True)
    password_hash = db.Column(db.String(128))

    player_games = db.relationship(
        'GamePlayer',
        back_populates='player',
        cascade='save-update, merge, delete, delete-orphan')
    games = association_proxy('player_games', 'game',
        creator=lambda game: GamePlayer(game=game))

    player_found_objectives = db.relationship(
        'PlayerFoundObjective',
        back_populates='player',
        cascade='save-update, merge, delete, delete-orphan')
    found_objectives = association_proxy('player_found_objectives', 'objective',
        creator=lambda objective: PlayerFoundObjective(objective=objective))

    player_notifications = db.relationship(
        'NotificationPlayer',
        back_populates='recipient',
        cascade='save-update, merge, delete, delete-orphan')
    notifications = association_proxy('player_notifications', 'notification',
        creator=lambda notification: NotificationPlayer(notification=notification))

    player_caught_players = db.relationship(
        'PlayerCaughtPlayer',
        back_populates='catching_player',
        cascade='save-update, merge, delete, delete-orphan',
        foreign_keys=[PlayerCaughtPlayer.catching_player_id])
    caught_players = association_proxy('player_caught_players', 'player',
        creator=lambda player: PlayerCaughtPlayer(caught_player=player))

    player_caught_by_players = db.relationship(
        'PlayerCaughtPlayer',
        back_populates='caught_player',
        cascade='save-update, merge, delete, delete-orphan',
        foreign_keys=[PlayerCaughtPlayer.caught_player_id])
    caught_by_players = association_proxy('player_caught_by_players', 'player',
        creator=lambda player: PlayerCaughtPlayer(catching_player=player))

    locations = db.relationship(
        'Location',
        lazy='select',
        backref=db.backref('player', lazy='joined'))

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def set_auth_hash(self):
        self.auth_hash = token_hex(16)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

    def locations_game(self, game):
        # pylint: disable=not-an-iterable
        if not self.locations:
            return None
        if game is None:
            return self.locations
        game_start = game.start_time or datetime.min
        game_end = game.end_time or datetime.max
        return (location for location in self.locations if location.timestamp > game_start and location.timestamp < game_end)

    def last_location(self, game=None):
        # pylint: disable=not-an-iterable
        if not self.locations:
            return None
        if game is None:
            return max(self.locations, key=lambda location: location.timestamp)
        return max(self.locations_game(game), key=lambda location: location.timestamp)

    @staticmethod
    def delete_orphans():
        Player.query.filter(~Player.player_games.any()).delete()
        db.session.commit()

@login.user_loader
def load_user(id):
    return Player.query.get(int(id))

class Objective(db.Model):
    """ !Always call set_hash after() creating new instance! """
    __tablename__ = 'objective'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64))
    game_id = db.Column(db.Integer, db.ForeignKey('game.id'), nullable=False)
    hash = db.Column(db.String(32), unique=True, nullable=False)
    longitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None)) # maybe check asdecimal and decimal_return_scale later?
    latitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None))
    objective_found_by = db.relationship(
        'PlayerFoundObjective',
        back_populates='objective',
        cascade='save-update, merge, delete, delete-orphan')
    found_by = association_proxy('objective_found_by', 'player',
        creator=lambda player: PlayerFoundObjective(player=player))

    def set_hash(self):
        self.hash = token_hex(16)

class ObjectiveMinimalEncoder(JSONEncoder):
    def default(self, objective):
        return {
            'name' : objective.name,
            'hash' : objective.hash,
            'longitude' : objective.longitude,
            'latitude' : objective.latitude
        }

class Location(db.Model):
    __tablename__ = 'location'
    id = db.Column(db.Integer, primary_key=True)
    player_id = db.Column(db.Integer, db.ForeignKey('player.id'), nullable=False)
    longitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None),nullable=False) # maybe check asdecimal and decimal_return_scale later?
    latitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None),nullable=False)
    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)

    def __str__(self):
        return f'{self.longitude}, {self.latitude}'

class LocationEncoder(JSONEncoder):
    def default(self, location):
        return {
            'player_name' : location.player.name,
            'longitude' : location.longitude,
            'latitude' : location.latitude,
            'timestamp_utc' : str(location.timestamp)
        }

class Notification(db.Model):
    __tablename__ = 'notification'
    id = db.Column(db.Integer, primary_key=True)
    game_id = db.Column(db.Integer, db.ForeignKey('game.id'), nullable=False)
    message = db.Column(db.Text, nullable=False)
    type = db.Column(db.String(64), nullable=False, default='General')
    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)

    notification_recipients = db.relationship(
        'NotificationPlayer',
        back_populates='notification',
        cascade='save-update, merge, delete, delete-orphan')
    recipients = association_proxy('notification_recipients', 'player',
        creator=lambda player: NotificationPlayer(recipient=player))

#start_time = db.Column(db.DateTime, server_default=func.now())