"""Add container_customizations table

Revision ID: 0019_add_container_customizations
Revises: 0018
Create Date: 2025-12-24
"""

from __future__ import annotations

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy import inspect


revision: str = '0019_add_container_customizations'
down_revision: Union[str, None] = '0018'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    bind = op.get_bind()
    insp = inspect(bind)

    def _table_exists(name: str) -> bool:
        try:
            return insp.has_table(name)
        except Exception:
            return name in insp.get_table_names()

    def _index_exists(table: str, index: str) -> bool:
        try:
            return any(i.get('name') == index for i in insp.get_indexes(table))
        except Exception:
            return False

    if not _table_exists('container_customizations'):
        op.create_table(
            'container_customizations',
            sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
            sa.Column('user_id', sa.Integer(), nullable=True),
            sa.Column('host_id', sa.String(), nullable=False),
            sa.Column('container_id', sa.String(length=64), nullable=False),
            sa.Column('icon_key', sa.String(length=100), nullable=True),
            sa.Column('icon_color', sa.String(length=20), nullable=True),
            sa.Column('bg_color', sa.String(length=20), nullable=True),
            sa.Column('created_at', sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
            sa.Column('updated_at', sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
            sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
            sa.ForeignKeyConstraint(['host_id'], ['hosts.id'], ondelete='CASCADE'),
            sa.PrimaryKeyConstraint('id'),
        )

    if _table_exists('container_customizations'):
        if not _index_exists('container_customizations', 'ix_container_customizations_user_id'):
            op.create_index('ix_container_customizations_user_id', 'container_customizations', ['user_id'])
        if not _index_exists('container_customizations', 'ix_container_customizations_host_id'):
            op.create_index('ix_container_customizations_host_id', 'container_customizations', ['host_id'])
        if not _index_exists('container_customizations', 'ix_container_customizations_host_container'):
            op.create_index(
                'ix_container_customizations_host_container',
                'container_customizations',
                ['host_id', 'container_id'],
            )
        if not _index_exists('container_customizations', 'uq_container_customizations_user_host_container'):
            op.create_index(
                'uq_container_customizations_user_host_container',
                'container_customizations',
                ['user_id', 'host_id', 'container_id'],
                unique=True,
            )


def downgrade() -> None:
    op.drop_index('uq_container_customizations_user_host_container', table_name='container_customizations')
    op.drop_index('ix_container_customizations_host_container', table_name='container_customizations')
    op.drop_index('ix_container_customizations_host_id', table_name='container_customizations')
    op.drop_index('ix_container_customizations_user_id', table_name='container_customizations')
    op.drop_table('container_customizations')