from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
from sqlalchemy.orm import relationship, sessionmaker, Mapped, backref

from .show import Base
from .track import Track

from ffx.media_descriptor import MediaDescriptor

class Pattern(Base):

    __tablename__ = 'patterns'

    # v1.x
    id = Column(Integer, primary_key=True)
    pattern = Column(String)

    # v2.0
    # id: Mapped[int] = mapped_column(Integer, primary_key=True)
    # pattern: Mapped[str] = mapped_column(String, nullable=False)

    # v1.x
    show_id = Column(Integer, ForeignKey('shows.id', ondelete="CASCADE"))
    show = relationship('Show', back_populates='patterns')

    # v2.0
    # show_id: Mapped[int] = mapped_column(ForeignKey("shows.id", ondelete="CASCADE"))
    # show: Mapped["Show"] = relationship(back_populates="patterns")

    tracks = relationship('Track', back_populates='pattern', cascade="all, delete")


    media_tags = relationship('MediaTag', back_populates='pattern', cascade="all, delete")


    def getDescriptor(self):

        descriptor = {}
        descriptor['id'] = int(self.id)
        descriptor['pattern'] = str(self.pattern)
        descriptor['show_id'] = int(self.show_id)

        descriptor['tags'] = {}
        for t in self.media_tags:
            descriptor['tags'][str(t.key)] = str(t.value)

        return descriptor


    def getMediaDescriptor(self):

        md = MediaDescriptor(tags = self.getDescriptor()['tags'])

        for t in self.tracks:
            md.appendTrack(t.getDescriptor())

        return md