"""Initial schema

Revision ID: 00001
Revises: 
Create Date: 2023-10-01

"""
import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision = '00001'
down_revision = None
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Create users table
    op.create_table(
        'users',
        sa.Column('id', sa.String(), nullable=False),
        sa.Column('email', sa.String(), nullable=False),
        sa.Column('username', sa.String(), nullable=False),
        sa.Column('hashed_password', sa.String(), nullable=False),
        sa.Column('full_name', sa.String(), nullable=True),
        sa.Column('role', sa.Enum('admin', 'customer', 'staff', name='userrole'), nullable=False),
        sa.Column('is_active', sa.Boolean(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)

    # Create categories table
    op.create_table(
        'categories',
        sa.Column('id', sa.String(), nullable=False),
        sa.Column('name', sa.String(), nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index(op.f('ix_categories_id'), 'categories', ['id'], unique=False)
    op.create_index(op.f('ix_categories_name'), 'categories', ['name'], unique=True)

    # Create products table
    op.create_table(
        'products',
        sa.Column('id', sa.String(), nullable=False),
        sa.Column('name', sa.String(), nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('price', sa.Float(), nullable=False),
        sa.Column('sku', sa.String(), nullable=False),
        sa.Column('is_active', sa.Boolean(), nullable=True),
        sa.Column('category_id', sa.String(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index(op.f('ix_products_id'), 'products', ['id'], unique=False)
    op.create_index(op.f('ix_products_name'), 'products', ['name'], unique=False)
    op.create_index(op.f('ix_products_sku'), 'products', ['sku'], unique=True)

    # Create inventory_items table
    op.create_table(
        'inventory_items',
        sa.Column('id', sa.String(), nullable=False),
        sa.Column('quantity', sa.Integer(), nullable=False),
        sa.Column('status', sa.Enum('in_stock', 'low_stock', 'out_of_stock', 'discontinued', name='inventorystatus'), nullable=False),
        sa.Column('location', sa.String(), nullable=True),
        sa.Column('notes', sa.Text(), nullable=True),
        sa.Column('product_id', sa.String(), nullable=False),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index(op.f('ix_inventory_items_id'), 'inventory_items', ['id'], unique=False)

    # Create inventory_transactions table
    op.create_table(
        'inventory_transactions',
        sa.Column('id', sa.String(), nullable=False),
        sa.Column('product_id', sa.String(), nullable=False),
        sa.Column('quantity_change', sa.Integer(), nullable=False),
        sa.Column('notes', sa.Text(), nullable=True),
        sa.Column('transaction_by', sa.String(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
        sa.ForeignKeyConstraint(['transaction_by'], ['users.id'], ),
        sa.PrimaryKeyConstraint('id'),
    )
    op.create_index(op.f('ix_inventory_transactions_id'), 'inventory_transactions', ['id'], unique=False)


def downgrade() -> None:
    # Drop tables in reverse order to handle foreign key constraints
    op.drop_index(op.f('ix_inventory_transactions_id'), table_name='inventory_transactions')
    op.drop_table('inventory_transactions')
    
    op.drop_index(op.f('ix_inventory_items_id'), table_name='inventory_items')
    op.drop_table('inventory_items')
    
    op.drop_index(op.f('ix_products_sku'), table_name='products')
    op.drop_index(op.f('ix_products_name'), table_name='products')
    op.drop_index(op.f('ix_products_id'), table_name='products')
    op.drop_table('products')
    
    op.drop_index(op.f('ix_categories_name'), table_name='categories')
    op.drop_index(op.f('ix_categories_id'), table_name='categories')
    op.drop_table('categories')
    
    op.drop_index(op.f('ix_users_username'), table_name='users')
    op.drop_index(op.f('ix_users_id'), table_name='users')
    op.drop_index(op.f('ix_users_email'), table_name='users')
    op.drop_table('users')
    
    # Drop enum types after tables
    op.execute('DROP TYPE userrole')
    op.execute('DROP TYPE inventorystatus')