"""Add environments table and environment_id FK on tickets

Revision ID: 0002
Revises: 0001
Create Date: 2026-05-25
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0002"
down_revision: Union[str, None] = "0001"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "environments",
        sa.Column("id",          sa.Integer(),              primary_key=True),
        sa.Column("prefix",      sa.String(16),             nullable=False, unique=True),
        sa.Column("name",        sa.String(64),             nullable=False),
        sa.Column("description", sa.Text(),                 nullable=True),
        sa.Column("created_at",  sa.DateTime(timezone=True), nullable=False,
                  server_default=sa.func.now()),
    )

    op.execute("INSERT INTO environments (prefix, name) VALUES ('HOME', 'Homelab')")

    op.add_column("tickets",
        sa.Column("environment_id", sa.Integer(),
                  sa.ForeignKey("environments.id", ondelete="SET NULL"), nullable=True))

    op.execute(
        "UPDATE tickets SET environment_id = (SELECT id FROM environments WHERE prefix = 'HOME')"
    )

    op.create_index("ix_tickets_environment_id", "tickets", ["environment_id"])


def downgrade() -> None:
    op.drop_index("ix_tickets_environment_id", table_name="tickets")
    op.drop_column("tickets", "environment_id")
    op.drop_table("environments")