"""git_sources.kind + path: local-directory source discriminator

Revision ID: 0007
Revises: 0006
Create Date: 2026-08-26

Phase 38 (local-directory-sources story, A13 — additive, reversible
columns; the phase-35 table is extended, not duplicated):

* ``git_sources.kind`` — TEXT NOT NULL with server default ``'git'`` and
  check constraint ``ck_git_sources_kind`` (``kind IN ('git', 'local')``).
  Existing rows read as ``kind='git'``; git rows keep ``url``, local
  rows carry an existing directory under ``path`` (walked directly —
  no clone/pull).
* ``git_sources.path`` — TEXT, nullable (NULL for git rows). Made unique
  by the plain unique index ``uq_git_sources_path`` — mirrors 0006's
  ``uq_git_sources_url`` choice for ``url`` (Postgres treats NULLs as
  distinct under a unique index, and the API enforces local-only paths
  anyway).
"""
from __future__ import annotations

import sqlalchemy as sa

from alembic import op

revision = "0007"
down_revision = "0006"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "git_sources",
        sa.Column("kind", sa.Text(), server_default=sa.text("'git'"), nullable=False),
    )
    op.create_check_constraint(
        "ck_git_sources_kind", "git_sources", "kind IN ('git', 'local')"
    )
    op.add_column("git_sources", sa.Column("path", sa.Text(), nullable=True))
    op.create_index("uq_git_sources_path", "git_sources", ["path"], unique=True)


def downgrade() -> None:
    op.drop_index("uq_git_sources_path", table_name="git_sources")
    op.drop_constraint("ck_git_sources_kind", table_name="git_sources", type_="check")
    op.drop_column("git_sources", "path")
    op.drop_column("git_sources", "kind")