"""add cart_items table

Revision ID: a2064e1dfcd4
Revises: f68d8da5315a
Create Date: 2025-11-23 19:52:40.509538

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = 'a2064e1dfcd4'
down_revision: Union[str, None] = 'f68d8da5315a'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Create cart_items table
    op.create_table(
        'cart_items',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('vendor_id', sa.Integer(), nullable=False),
        sa.Column('product_id', sa.Integer(), nullable=False),
        sa.Column('session_id', sa.String(length=255), nullable=False),
        sa.Column('quantity', sa.Integer(), nullable=False),
        sa.Column('price_at_add', sa.Float(), nullable=False),
        sa.Column('created_at', sa.DateTime(), nullable=True),
        sa.Column('updated_at', sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
        sa.ForeignKeyConstraint(['vendor_id'], ['vendors.id'], ),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('vendor_id', 'session_id', 'product_id', name='uq_cart_item')
    )

    # Create indexes
    op.create_index('idx_cart_session', 'cart_items', ['vendor_id', 'session_id'], unique=False)
    op.create_index('idx_cart_created', 'cart_items', ['created_at'], unique=False)
    op.create_index(op.f('ix_cart_items_id'), 'cart_items', ['id'], unique=False)
    op.create_index(op.f('ix_cart_items_session_id'), 'cart_items', ['session_id'], unique=False)


def downgrade() -> None:
    # Drop indexes
    op.drop_index(op.f('ix_cart_items_session_id'), table_name='cart_items')
    op.drop_index(op.f('ix_cart_items_id'), table_name='cart_items')
    op.drop_index('idx_cart_created', table_name='cart_items')
    op.drop_index('idx_cart_session', table_name='cart_items')

    # Drop table
    op.drop_table('cart_items')