import datetime
import os
from typing import Any, Dict, Optional, Union
from uuid import UUID, uuid4

from fittrackee import db
from sqlalchemy.dialects import postgresql
from sqlalchemy.engine.base import Connection
from sqlalchemy.event import listens_for
from sqlalchemy.ext.declarative import DeclarativeMeta
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm.mapper import Mapper
from sqlalchemy.orm.session import Session, object_session
from sqlalchemy.types import JSON, Enum

from .utils_files import get_absolute_file_path
from .utils_format import convert_in_duration, convert_value_to_integer
from .utils_id import encode_uuid

BaseModel: DeclarativeMeta = db.Model
record_types = [
    'AS',  # 'Best Average Speed'
    'FD',  # 'Farthest Distance'
    'LD',  # 'Longest Duration'
    'MS',  # 'Max speed'
]


def update_records(
    user_id: int, sport_id: int, connection: Connection, session: Session
) -> None:
    record_table = Record.__table__
    new_records = Workout.get_user_workout_records(user_id, sport_id)
    for record_type, record_data in new_records.items():
        if record_data['record_value']:
            record = Record.query.filter_by(
                user_id=user_id, sport_id=sport_id, record_type=record_type
            ).first()
            if record:
                value = convert_value_to_integer(
                    record_type, record_data['record_value']
                )
                connection.execute(
                    record_table.update()
                    .where(record_table.c.id == record.id)
                    .values(
                        value=value,
                        workout_id=record_data['workout'].id,
                        workout_uuid=record_data['workout'].uuid,
                        workout_date=record_data['workout'].workout_date,
                    )
                )
            else:
                new_record = Record(
                    workout=record_data['workout'], record_type=record_type
                )
                new_record.value = record_data['record_value']  # type: ignore
                session.add(new_record)
        else:
            connection.execute(
                record_table.delete()
                .where(record_table.c.user_id == user_id)
                .where(record_table.c.sport_id == sport_id)
                .where(record_table.c.record_type == record_type)
            )


class Sport(BaseModel):
    __tablename__ = 'sports'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    label = db.Column(db.String(50), unique=True, nullable=False)
    img = db.Column(db.String(255), unique=True, nullable=True)
    is_active = db.Column(db.Boolean, default=True, nullable=False)
    workouts = db.relationship(
        'Workout', lazy=True, backref=db.backref('sports', lazy='joined')
    )
    records = db.relationship(
        'Record', lazy=True, backref=db.backref('sports', lazy='joined')
    )

    def __repr__(self) -> str:
        return f'<Sport {self.label!r}>'

    def __init__(self, label: str) -> None:
        self.label = label

    def serialize(self, is_admin: Optional[bool] = False) -> Dict:
        serialized_sport = {
            'id': self.id,
            'label': self.label,
            'img': self.img,
            'is_active': self.is_active,
        }
        if is_admin:
            serialized_sport['has_workouts'] = len(self.workouts) > 0
        return serialized_sport


class Workout(BaseModel):
    __tablename__ = 'workouts'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    uuid = db.Column(
        postgresql.UUID(as_uuid=True),
        default=uuid4,
        unique=True,
        nullable=False,
    )
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    sport_id = db.Column(
        db.Integer, db.ForeignKey('sports.id'), nullable=False
    )
    title = db.Column(db.String(255), nullable=True)
    gpx = db.Column(db.String(255), nullable=True)
    creation_date = db.Column(db.DateTime, default=datetime.datetime.utcnow)
    modification_date = db.Column(
        db.DateTime, onupdate=datetime.datetime.utcnow
    )
    workout_date = db.Column(db.DateTime, nullable=False)
    duration = db.Column(db.Interval, nullable=False)
    pauses = db.Column(db.Interval, nullable=True)
    moving = db.Column(db.Interval, nullable=True)
    distance = db.Column(db.Numeric(6, 3), nullable=True)  # kilometers
    min_alt = db.Column(db.Numeric(6, 2), nullable=True)  # meters
    max_alt = db.Column(db.Numeric(6, 2), nullable=True)  # meters
    descent = db.Column(db.Numeric(7, 2), nullable=True)  # meters
    ascent = db.Column(db.Numeric(7, 2), nullable=True)  # meters
    max_speed = db.Column(db.Numeric(6, 2), nullable=True)  # km/h
    ave_speed = db.Column(db.Numeric(6, 2), nullable=True)  # km/h
    bounds = db.Column(postgresql.ARRAY(db.Float), nullable=True)
    map = db.Column(db.String(255), nullable=True)
    map_id = db.Column(db.String(50), nullable=True)
    weather_start = db.Column(JSON, nullable=True)
    weather_end = db.Column(JSON, nullable=True)
    notes = db.Column(db.String(500), nullable=True)
    segments = db.relationship(
        'WorkoutSegment',
        lazy=True,
        cascade='all, delete',
        backref=db.backref('workouts', lazy='joined', single_parent=True),
    )
    records = db.relationship(
        'Record',
        lazy=True,
        cascade='all, delete',
        backref=db.backref('workouts', lazy='joined', single_parent=True),
    )

    def __str__(self) -> str:
        return f'<Workout \'{self.sports.label}\' - {self.workout_date}>'

    def __init__(
        self,
        user_id: int,
        sport_id: int,
        workout_date: datetime.datetime,
        distance: float,
        duration: datetime.timedelta,
    ) -> None:
        self.user_id = user_id
        self.sport_id = sport_id
        self.workout_date = workout_date
        self.distance = distance
        self.duration = duration

    @property
    def short_id(self) -> str:
        return encode_uuid(self.uuid)

    def serialize(self, params: Optional[Dict] = None) -> Dict:
        date_from = params.get('from') if params else None
        date_to = params.get('to') if params else None
        distance_from = params.get('distance_from') if params else None
        distance_to = params.get('distance_to') if params else None
        duration_from = params.get('duration_from') if params else None
        duration_to = params.get('duration_to') if params else None
        ave_speed_from = params.get('ave_speed_from') if params else None
        ave_speed_to = params.get('ave_speed_to') if params else None
        max_speed_from = params.get('max_speed_from') if params else None
        max_speed_to = params.get('max_speed_to') if params else None
        sport_id = params.get('sport_id') if params else None
        previous_workout = (
            Workout.query.filter(
                Workout.id != self.id,
                Workout.user_id == self.user_id,
                Workout.sport_id == sport_id if sport_id else True,
                Workout.workout_date <= self.workout_date,
                Workout.workout_date
                >= datetime.datetime.strptime(date_from, '%Y-%m-%d')
                if date_from
                else True,
                Workout.workout_date
                <= datetime.datetime.strptime(date_to, '%Y-%m-%d')
                if date_to
                else True,
                Workout.distance >= int(distance_from)
                if distance_from
                else True,
                Workout.distance <= int(distance_to) if distance_to else True,
                Workout.duration >= convert_in_duration(duration_from)
                if duration_from
                else True,
                Workout.duration <= convert_in_duration(duration_to)
                if duration_to
                else True,
                Workout.ave_speed >= float(ave_speed_from)
                if ave_speed_from
                else True,
                Workout.ave_speed <= float(ave_speed_to)
                if ave_speed_to
                else True,
                Workout.max_speed >= float(max_speed_from)
                if max_speed_from
                else True,
                Workout.max_speed <= float(max_speed_to)
                if max_speed_to
                else True,
            )
            .order_by(Workout.workout_date.desc())
            .first()
        )
        next_workout = (
            Workout.query.filter(
                Workout.id != self.id,
                Workout.user_id == self.user_id,
                Workout.sport_id == sport_id if sport_id else True,
                Workout.workout_date >= self.workout_date,
                Workout.workout_date
                >= datetime.datetime.strptime(date_from, '%Y-%m-%d')
                if date_from
                else True,
                Workout.workout_date
                <= datetime.datetime.strptime(date_to, '%Y-%m-%d')
                if date_to
                else True,
                Workout.distance >= int(distance_from)
                if distance_from
                else True,
                Workout.distance <= int(distance_to) if distance_to else True,
                Workout.duration >= convert_in_duration(duration_from)
                if duration_from
                else True,
                Workout.duration <= convert_in_duration(duration_to)
                if duration_to
                else True,
                Workout.ave_speed >= float(ave_speed_from)
                if ave_speed_from
                else True,
                Workout.ave_speed <= float(ave_speed_to)
                if ave_speed_to
                else True,
            )
            .order_by(Workout.workout_date.asc())
            .first()
        )
        return {
            'id': self.short_id,  # WARNING: client use uuid as id
            'user': self.user.username,
            'sport_id': self.sport_id,
            'title': self.title,
            'creation_date': self.creation_date,
            'modification_date': self.modification_date,
            'workout_date': self.workout_date,
            'duration': str(self.duration) if self.duration else None,
            'pauses': str(self.pauses) if self.pauses else None,
            'moving': str(self.moving) if self.moving else None,
            'distance': float(self.distance) if self.distance else None,
            'min_alt': float(self.min_alt) if self.min_alt else None,
            'max_alt': float(self.max_alt) if self.max_alt else None,
            'descent': float(self.descent) if self.descent else None,
            'ascent': float(self.ascent) if self.ascent else None,
            'max_speed': float(self.max_speed) if self.max_speed else None,
            'ave_speed': float(self.ave_speed) if self.ave_speed else None,
            'with_gpx': self.gpx is not None,
            'bounds': [float(bound) for bound in self.bounds]
            if self.bounds
            else [],  # noqa
            'previous_workout': previous_workout.short_id
            if previous_workout
            else None,  # noqa
            'next_workout': next_workout.short_id if next_workout else None,
            'segments': [segment.serialize() for segment in self.segments],
            'records': [record.serialize() for record in self.records],
            'map': self.map_id if self.map else None,
            'weather_start': self.weather_start,
            'weather_end': self.weather_end,
            'notes': self.notes,
        }

    @classmethod
    def get_user_workout_records(
        cls, user_id: int, sport_id: int, as_integer: Optional[bool] = False
    ) -> Dict:
        record_types_columns = {
            'AS': 'ave_speed',  # 'Average speed'
            'FD': 'distance',  # 'Farthest Distance'
            'LD': 'moving',  # 'Longest Duration'
            'MS': 'max_speed',  # 'Max speed'
        }
        records = {}
        for record_type, column in record_types_columns.items():
            column_sorted = getattr(getattr(Workout, column), 'desc')()
            record_workout = (
                Workout.query.filter_by(user_id=user_id, sport_id=sport_id)
                .order_by(column_sorted, Workout.workout_date)
                .first()
            )
            records[record_type] = dict(
                record_value=(
                    getattr(record_workout, column) if record_workout else None
                ),
                workout=record_workout,
            )
        return records


@listens_for(Workout, 'after_insert')
def on_workout_insert(
    mapper: Mapper, connection: Connection, workout: Workout
) -> None:
    @listens_for(db.Session, 'after_flush', once=True)
    def receive_after_flush(session: Session, context: Any) -> None:
        update_records(
            workout.user_id, workout.sport_id, connection, session
        )  # noqa


@listens_for(Workout, 'after_update')
def on_workout_update(
    mapper: Mapper, connection: Connection, workout: Workout
) -> None:
    if object_session(workout).is_modified(
        workout, include_collections=True
    ):  # noqa

        @listens_for(db.Session, 'after_flush', once=True)
        def receive_after_flush(session: Session, context: Any) -> None:
            sports_list = [workout.sport_id]
            records = Record.query.filter_by(workout_id=workout.id).all()
            for rec in records:
                if rec.sport_id not in sports_list:
                    sports_list.append(rec.sport_id)
            for sport_id in sports_list:
                update_records(workout.user_id, sport_id, connection, session)


@listens_for(Workout, 'after_delete')
def on_workout_delete(
    mapper: Mapper, connection: Connection, old_record: 'Record'
) -> None:
    @listens_for(db.Session, 'after_flush', once=True)
    def receive_after_flush(session: Session, context: Any) -> None:
        if old_record.map:
            os.remove(get_absolute_file_path(old_record.map))
        if old_record.gpx:
            os.remove(get_absolute_file_path(old_record.gpx))


class WorkoutSegment(BaseModel):
    __tablename__ = 'workout_segments'
    workout_id = db.Column(
        db.Integer, db.ForeignKey('workouts.id'), primary_key=True
    )
    workout_uuid = db.Column(postgresql.UUID(as_uuid=True), nullable=False)
    segment_id = db.Column(db.Integer, primary_key=True)
    duration = db.Column(db.Interval, nullable=False)
    pauses = db.Column(db.Interval, nullable=True)
    moving = db.Column(db.Interval, nullable=True)
    distance = db.Column(db.Numeric(6, 3), nullable=True)  # kilometers
    min_alt = db.Column(db.Numeric(6, 2), nullable=True)  # meters
    max_alt = db.Column(db.Numeric(6, 2), nullable=True)  # meters
    descent = db.Column(db.Numeric(7, 2), nullable=True)  # meters
    ascent = db.Column(db.Numeric(7, 2), nullable=True)  # meters
    max_speed = db.Column(db.Numeric(6, 2), nullable=True)  # km/h
    ave_speed = db.Column(db.Numeric(6, 2), nullable=True)  # km/h

    def __str__(self) -> str:
        return (
            f'<Segment \'{self.segment_id}\' '
            f'for workout \'{encode_uuid(self.workout_uuid)}\'>'
        )

    def __init__(
        self, segment_id: int, workout_id: int, workout_uuid: UUID
    ) -> None:
        self.segment_id = segment_id
        self.workout_id = workout_id
        self.workout_uuid = workout_uuid

    def serialize(self) -> Dict:
        return {
            'workout_id': encode_uuid(self.workout_uuid),
            'segment_id': self.segment_id,
            'duration': str(self.duration) if self.duration else None,
            'pauses': str(self.pauses) if self.pauses else None,
            'moving': str(self.moving) if self.moving else None,
            'distance': float(self.distance) if self.distance else None,
            'min_alt': float(self.min_alt) if self.min_alt else None,
            'max_alt': float(self.max_alt) if self.max_alt else None,
            'descent': float(self.descent) if self.descent else None,
            'ascent': float(self.ascent) if self.ascent else None,
            'max_speed': float(self.max_speed) if self.max_speed else None,
            'ave_speed': float(self.ave_speed) if self.ave_speed else None,
        }


class Record(BaseModel):
    __tablename__ = "records"
    __table_args__ = (
        db.UniqueConstraint(
            'user_id', 'sport_id', 'record_type', name='user_sports_records'
        ),
    )
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    sport_id = db.Column(
        db.Integer, db.ForeignKey('sports.id'), nullable=False
    )
    workout_id = db.Column(
        db.Integer, db.ForeignKey('workouts.id'), nullable=False
    )
    workout_uuid = db.Column(postgresql.UUID(as_uuid=True), nullable=False)
    record_type = db.Column(Enum(*record_types, name="record_types"))
    workout_date = db.Column(db.DateTime, nullable=False)
    _value = db.Column("value", db.Integer, nullable=True)

    def __str__(self) -> str:
        return (
            f'<Record {self.sports.label} - '
            f'{self.record_type} - '
            f"{self.workout_date.strftime('%Y-%m-%d')}>"
        )

    def __init__(self, workout: Workout, record_type: str) -> None:
        self.user_id = workout.user_id
        self.sport_id = workout.sport_id
        self.workout_id = workout.id
        self.workout_uuid = workout.uuid
        self.record_type = record_type
        self.workout_date = workout.workout_date

    @hybrid_property
    def value(self) -> Optional[Union[datetime.timedelta, float]]:
        if self._value is None:
            return None
        if self.record_type == 'LD':
            return datetime.timedelta(seconds=self._value)
        elif self.record_type in ['AS', 'MS']:
            return float(self._value / 100)
        else:  # 'FD'
            return float(self._value / 1000)

    @value.setter  # type: ignore
    def value(self, val: Union[str, float]) -> None:
        self._value = convert_value_to_integer(self.record_type, val)

    def serialize(self) -> Dict:
        if self.value is None:
            value = None
        elif self.record_type in ['AS', 'FD', 'MS']:
            value = float(self.value)  # type: ignore
        else:  # 'LD'
            value = str(self.value)  # type: ignore

        return {
            'id': self.id,
            'user': self.user.username,
            'sport_id': self.sport_id,
            'workout_id': encode_uuid(self.workout_uuid),
            'record_type': self.record_type,
            'workout_date': self.workout_date,
            'value': value,
        }


@listens_for(Record, 'after_delete')
def on_record_delete(
    mapper: Mapper, connection: Connection, old_record: Record
) -> None:
    @listens_for(db.Session, 'after_flush', once=True)
    def receive_after_flush(session: Session, context: Any) -> None:
        workout = old_record.workouts
        new_records = Workout.get_user_workout_records(
            workout.user_id, workout.sport_id
        )
        for record_type, record_data in new_records.items():
            if (
                record_data['record_value']
                and record_type == old_record.record_type
            ):
                new_record = Record(
                    workout=record_data['workout'], record_type=record_type
                )
                new_record.value = record_data['record_value']  # type: ignore
                session.add(new_record)