"""add_document_file_sizes

Revision ID: 004_add_document_file_sizes
Revises: 003_add_user_invitation_fields
Create Date: 2026-01-04

Adds file_size_bytes to all document tables:
- newsletter_archives
- financial_reports
- bylaws_documents
"""
from typing import Sequence, Union
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '004_add_document_file_sizes'
down_revision: Union[str, None] = '003_add_user_invitation_fields'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Add file_size_bytes column to document tables (skip if already exists)"""
    from sqlalchemy import inspect

    conn = op.get_bind()
    inspector = inspect(conn)

    # Add to newsletter_archives if missing
    existing_columns = {col['name'] for col in inspector.get_columns('newsletter_archives')}
    if 'file_size_bytes' not in existing_columns:
        op.add_column('newsletter_archives', sa.Column('file_size_bytes', sa.Integer(), nullable=True))

    # Add to financial_reports if missing
    existing_columns = {col['name'] for col in inspector.get_columns('financial_reports')}
    if 'file_size_bytes' not in existing_columns:
        op.add_column('financial_reports', sa.Column('file_size_bytes', sa.Integer(), nullable=True))

    # Add to bylaws_documents if missing
    existing_columns = {col['name'] for col in inspector.get_columns('bylaws_documents')}
    if 'file_size_bytes' not in existing_columns:
        op.add_column('bylaws_documents', sa.Column('file_size_bytes', sa.Integer(), nullable=True))


def downgrade() -> None:
    """Remove file_size_bytes columns (rollback)"""

    op.drop_column('bylaws_documents', 'file_size_bytes')
    op.drop_column('financial_reports', 'file_size_bytes')
    op.drop_column('newsletter_archives', 'file_size_bytes')