"""Initial database schema

Revision ID: 001
Revises: 
Create Date: 2024-01-01 10:00:00.000000

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.types import TypeDecorator
from pathlib import Path

# revision identifiers, used by Alembic.
revision = '001'
down_revision = None
branch_labels = None
depends_on = None

# Define the PathType here since it's needed for the migration
class PathType(TypeDecorator):
    impl = sa.String
    cache_ok = True

    def process_bind_param(self, value, dialect):
        return None if value is None else str(value)

    def process_result_value(self, value, dialect):
        return None if value is None else Path(value)

def upgrade() -> None:
    # This represents the initial schema from the original system
    # The tables (tags, genre, game, metadata, metadata_genres, metadata_tags) 
    # already exist in the database, so this migration is just for tracking
    
    # If running on a fresh database, these would create the tables:
    
    # Create tags table
    op.create_table('tags',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('name', sa.String(length=30), nullable=False),
        sa.PrimaryKeyConstraint('id', name=op.f('pk_tags'))
    )
    op.create_index('ix_tags_name', 'tags', ['name'], unique=True)

    # Create genre table
    op.create_table('genre',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('name', sa.String(length=30), nullable=False),
        sa.PrimaryKeyConstraint('id', name=op.f('pk_genre'))
    )
    op.create_index('ix_genre_name', 'genre', ['name'], unique=True)

    # Create game table
    op.create_table('game',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('title', sa.String(length=66), nullable=False),
        sa.Column('path', PathType(), nullable=False),
        sa.PrimaryKeyConstraint('id', name=op.f('pk_game')),
        sa.UniqueConstraint('path', name=op.f('uq_game_path'))
    )
    op.create_index('ix_game_title', 'game', ['title'])

    # Create metadata table
    op.create_table('metadata',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('game_id', sa.Integer(), nullable=False),
        sa.Column('title', sa.String(length=66), nullable=False),
        sa.Column('description', sa.String(), nullable=True),
        sa.Column('year', sa.Integer(), nullable=True),
        sa.Column('developer', sa.String(length=255), nullable=True),
        sa.Column('publisher', sa.String(length=255), nullable=True),
        sa.Column('players', sa.Integer(), nullable=True),
        sa.Column('cover_image', sa.String(), nullable=True),
        sa.Column('screenshot', sa.String(), nullable=True),
        sa.ForeignKeyConstraint(['game_id'], ['game.id'], name=op.f('fk_metadata_game_id_game'), ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('id', name=op.f('pk_metadata')),
        sa.UniqueConstraint('game_id', name=op.f('uq_metadata_game_id'))
    )

    # Create association tables
    op.create_table('metadata_genres',
        sa.Column('metadata_id', sa.Integer(), nullable=False),
        sa.Column('genre_id', sa.Integer(), nullable=False),
        sa.ForeignKeyConstraint(['genre_id'], ['genre.id'], name=op.f('fk_metadata_genres_genre_id_genre'), ondelete='CASCADE'),
        sa.ForeignKeyConstraint(['metadata_id'], ['metadata.id'], name=op.f('fk_metadata_genres_metadata_id_metadata'), ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('metadata_id', 'genre_id', name=op.f('pk_metadata_genres')),
        sa.UniqueConstraint('metadata_id', 'genre_id', name=op.f('uq_metadata_genres_metadata_id'))
    )

    op.create_table('metadata_tags',
        sa.Column('metadata_id', sa.Integer(), nullable=False),
        sa.Column('tag_id', sa.Integer(), nullable=False),
        sa.ForeignKeyConstraint(['metadata_id'], ['metadata.id'], name=op.f('fk_metadata_tags_metadata_id_metadata'), ondelete='CASCADE'),
        sa.ForeignKeyConstraint(['tag_id'], ['tags.id'], name=op.f('fk_metadata_tags_tag_id_tags'), ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('metadata_id', 'tag_id', name=op.f('pk_metadata_tags')),
        sa.UniqueConstraint('metadata_id', 'tag_id', name=op.f('uq_metadata_tags_metadata_id'))
    )


def downgrade() -> None:
    op.drop_table('metadata_tags')
    op.drop_table('metadata_genres')
    op.drop_table('metadata')
    op.drop_table('game')
    op.drop_table('genre')
    op.drop_table('tags')