#!/usr/bin/python3

import logging
import os
import sqlalchemy

import pytiger.logging.config

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Float, DateTime, Integer, String
from sqlalchemy.orm.exc import NoResultFound
from sqlalchemy.orm import sessionmaker

from config import Config

from log import ERROR, DEBUG
# from log import INFO, ERROR, DEBUG

# "Constants"
# Instantiate logging
pytiger.logging.config.basic_config(stderr=False, level=logging.INFO)
log = logging.getLogger(__name__)
log.info("Starting")

# Create session at the global level as per
# https://docs.sqlalchemy.org/en/13/orm/session_basics.html

# Set up database connection
log.info("Connect to database")
engine = sqlalchemy.create_engine(f"{Config.MYSQL_CONNECT}?charset=utf8",
                                  encoding='utf-8',
                                  echo=Config.DISPLAY_SQL)
Base = declarative_base()
Base.metadata.create_all(engine)

# Create a Session
Session = sessionmaker(bind=engine)
session = Session()


# Database classes
class Settings(Base):
    __tablename__ = 'settings'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(32), nullable=False, unique=True)
    f_datetime = Column(DateTime, default=None, nullable=True)
    f_int = Column(Integer, default=None, nullable=True)
    f_string = Column(String(128), default=None, nullable=True)

    @classmethod
    def get_int(cls, name):
        try:
            int_setting = session.query(cls).filter(
                cls.name == name).one()
        except NoResultFound:
            int_setting = Settings()
            int_setting.name = name
            int_setting.f_int = None
            session.add(int_setting)
            session.commit()
        return int_setting

    def update(self, data):
        for key, value in data.items():
            assert hasattr(self, key)
            setattr(self, key, value)
        session.commit()


class Tracks(Base):
    __tablename__ = 'tracks'

    id = Column(Integer, primary_key=True, autoincrement=True)
    title = Column(String(256), index=True)
    artist = Column(String(256), index=True)
    duration = Column(Integer, index=True)
    start_gap = Column(Integer, index=False)
    fade_at = Column(Integer, index=False)
    silence_at = Column(Integer, index=False)
    path = Column(String(2048), index=False, nullable=False)

    mtime = Column(Float, index=True)
    lastplayed = Column(DateTime, index=True, default=None)

    def __repr__(self):
        return (
            f"<Track(id={self.id}, title={self.title}, "
            f"artist={self.artist}, path={self.path}>"
        )

    @classmethod
    def get_or_create(cls, path):
        DEBUG(f"get_or_create(cls, {path})")
        try:
            track = session.query(cls).filter(cls.path == path).one()
        except NoResultFound:
            track = Tracks()
            track.path = path
            session.add(track)
        return track

    @staticmethod
    def get_path(id):
        try:
            path = session.query(Tracks.path).filter(Tracks.id == id).one()[0]
            return os.path.join(Config.ROOT, path)
        except NoResultFound:
            print(f"Can't find track id {id}")
            return None

    @staticmethod
    def get_track(id):
        try:
            DEBUG(f"get_track({id})")
            track = session.query(Tracks).filter(Tracks.id == id).one()
            return track
        except NoResultFound:
            ERROR(f"get_track({id}): not found")
            return None

    @staticmethod
    def search_titles(text):
        return (
            session.query(Tracks)
            .filter(Tracks.title.ilike(f"%{text}%"))
            .order_by(Tracks.title)
        ).all()

    @staticmethod
    def track_from_id(id):
        return session.query(Tracks).filter(
            Tracks.id == id).one()