"""add stations and station_recipe_assignments tables

Revision ID: 002_add_stations
Revises: 001_image_path
Create Date: 2026-04-17

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa

revision: str = '002_add_stations'
down_revision: Union[str, None] = '001_image_path'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        'stations',
        sa.Column('id', sa.Integer, primary_key=True, autoincrement=True),
        sa.Column('code', sa.String(100), nullable=False),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('location', sa.String(255), nullable=True),
        sa.Column('notes', sa.Text, nullable=True),
        sa.Column('active', sa.Boolean, nullable=False, server_default='1'),
        sa.Column('created_by', sa.Integer, sa.ForeignKey('users.id'), nullable=False),
        sa.Column('created_at', sa.DateTime, nullable=False, server_default=sa.func.now()),
        sa.UniqueConstraint('code', name='uq_stations_code'),
        sa.Index('ix_stations_active', 'active'),
        mysql_engine='InnoDB',
        mysql_charset='utf8mb4',
    )

    op.create_table(
        'station_recipe_assignments',
        sa.Column('id', sa.Integer, primary_key=True, autoincrement=True),
        sa.Column('station_id', sa.Integer, sa.ForeignKey('stations.id', ondelete='CASCADE'), nullable=False),
        sa.Column('recipe_id', sa.Integer, sa.ForeignKey('recipes.id', ondelete='CASCADE'), nullable=False),
        sa.Column('assigned_by', sa.Integer, sa.ForeignKey('users.id'), nullable=False),
        sa.Column('assigned_at', sa.DateTime, nullable=False, server_default=sa.func.now()),
        sa.UniqueConstraint('station_id', 'recipe_id', name='uq_station_recipe'),
        sa.Index('ix_sra_station', 'station_id'),
        sa.Index('ix_sra_recipe', 'recipe_id'),
        mysql_engine='InnoDB',
        mysql_charset='utf8mb4',
    )


def downgrade() -> None:
    op.drop_table('station_recipe_assignments')
    op.drop_table('stations')