"""M2 operational model registry and artifact provenance.

Revision ID: 20260825_0004
Revises: 20260825_0003
"""

import sqlalchemy as sa

from alembic import op

revision = "20260825_0004"
down_revision = "20260825_0003"
branch_labels = None
depends_on = None


def upgrade() -> None:
    for column in (
        sa.Column("source_type", sa.String(32), nullable=False, server_default="huggingface"),
        sa.Column("upstream_metadata", sa.JSON(), nullable=False, server_default=sa.text("'{}'")),
        sa.Column("local_metadata", sa.JSON(), nullable=False, server_default=sa.text("'{}'")),
        sa.Column(
            "interpretation_metadata", sa.JSON(), nullable=False, server_default=sa.text("'{}'")
        ),
        sa.Column("description", sa.Text()),
    ):
        op.add_column("models", column)
    op.add_column("model_revisions", sa.Column("archived_at", sa.DateTime(timezone=True)))
    for column in (
        sa.Column("status", sa.String(32), nullable=False, server_default="remote"),
        sa.Column(
            "verification_details", sa.JSON(), nullable=False, server_default=sa.text("'{}'")
        ),
        sa.Column("archived_at", sa.DateTime(timezone=True)),
    ):
        op.add_column("model_artifacts", column)
    op.alter_column("model_artifacts", "storage_uri", existing_type=sa.Text(), nullable=True)
    for column in (
        sa.Column(
            "transformation_type", sa.String(64), nullable=False, server_default="conversion"
        ),
        sa.Column(
            "environment_snapshot", sa.JSON(), nullable=False, server_default=sa.text("'{}'")
        ),
        sa.Column("status", sa.String(32), nullable=False, server_default="remote"),
        sa.Column(
            "verification_details", sa.JSON(), nullable=False, server_default=sa.text("'{}'")
        ),
    ):
        op.add_column("derived_artifacts", column)
    op.alter_column("derived_artifacts", "storage_uri", existing_type=sa.Text(), nullable=True)
    op.alter_column(
        "derived_artifacts", "source_artifact_id", existing_type=sa.Uuid(), nullable=True
    )

    op.create_table(
        "storage_roots",
        sa.Column("compute_node_id", sa.Uuid(), nullable=False),
        sa.Column("name", sa.String(128), nullable=False),
        sa.Column("purpose", sa.String(64), nullable=False, server_default="model_artifacts"),
        sa.Column("path", sa.Text(), nullable=False),
        sa.Column("status", sa.String(32), nullable=False, server_default="unknown"),
        sa.Column("writable", sa.Boolean(), nullable=False, server_default=sa.false()),
        sa.Column("capacity_bytes", sa.BigInteger()),
        sa.Column("free_bytes", sa.BigInteger()),
        sa.Column("reserve_bytes", sa.BigInteger(), nullable=False, server_default="0"),
        sa.Column("reserve_percent", sa.Integer(), nullable=False, server_default="10"),
        sa.Column("capacity_observed_at", sa.DateTime(timezone=True)),
        sa.Column("validation_details", sa.JSON(), nullable=False, server_default=sa.text("'{}'")),
        sa.Column("deprecated_at", sa.DateTime(timezone=True)),
        sa.Column("id", sa.Uuid(), primary_key=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.ForeignKeyConstraint(["compute_node_id"], ["compute_nodes.id"], ondelete="RESTRICT"),
        sa.UniqueConstraint("compute_node_id", "path", name="uq_storage_root_node_path"),
        sa.CheckConstraint("reserve_bytes >= 0", name="ck_storage_root_reserve_bytes"),
        sa.CheckConstraint(
            "reserve_percent >= 0 AND reserve_percent <= 100",
            name="ck_storage_root_reserve_percent",
        ),
    )
    op.create_index("ix_storage_roots_compute_node_id", "storage_roots", ["compute_node_id"])
    op.create_table(
        "derived_artifact_sources",
        sa.Column("derived_artifact_id", sa.Uuid(), nullable=False),
        sa.Column("source_artifact_id", sa.Uuid(), nullable=False),
        sa.Column("ordinal", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("source_sha256", sa.String(64), nullable=False),
        sa.ForeignKeyConstraint(
            ["derived_artifact_id"], ["derived_artifacts.id"], ondelete="RESTRICT"
        ),
        sa.ForeignKeyConstraint(
            ["source_artifact_id"], ["model_artifacts.id"], ondelete="RESTRICT"
        ),
        sa.PrimaryKeyConstraint("derived_artifact_id", "source_artifact_id"),
        sa.UniqueConstraint(
            "derived_artifact_id", "source_artifact_id", name="uq_derived_artifact_source"
        ),
    )
    op.create_table(
        "artifact_locations",
        sa.Column("artifact_id", sa.Uuid()),
        sa.Column("derived_artifact_id", sa.Uuid()),
        sa.Column("storage_root_id", sa.Uuid(), nullable=False),
        sa.Column("relative_path", sa.Text(), nullable=False),
        sa.Column("status", sa.String(32), nullable=False, server_default="unknown"),
        sa.Column("size_bytes", sa.BigInteger()),
        sa.Column("observed_sha256", sa.String(64)),
        sa.Column("last_checked_at", sa.DateTime(timezone=True)),
        sa.Column("id", sa.Uuid(), primary_key=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.ForeignKeyConstraint(["artifact_id"], ["model_artifacts.id"], ondelete="RESTRICT"),
        sa.ForeignKeyConstraint(
            ["derived_artifact_id"], ["derived_artifacts.id"], ondelete="RESTRICT"
        ),
        sa.ForeignKeyConstraint(["storage_root_id"], ["storage_roots.id"], ondelete="RESTRICT"),
        sa.CheckConstraint(
            "(artifact_id IS NOT NULL AND derived_artifact_id IS NULL) OR "
            "(artifact_id IS NULL AND derived_artifact_id IS NOT NULL)",
            name="ck_artifact_location_one_owner",
        ),
        sa.UniqueConstraint(
            "storage_root_id", "relative_path", name="uq_storage_root_relative_path"
        ),
    )
    op.create_index("ix_artifact_locations_artifact_id", "artifact_locations", ["artifact_id"])
    op.create_index(
        "ix_artifact_locations_derived_artifact_id",
        "artifact_locations",
        ["derived_artifact_id"],
    )
    op.create_index(
        "ix_artifact_locations_storage_root_id", "artifact_locations", ["storage_root_id"]
    )


def downgrade() -> None:
    op.drop_table("artifact_locations")
    op.drop_table("derived_artifact_sources")
    op.drop_table("storage_roots")
    op.execute(
        "UPDATE model_artifacts SET storage_uri = 'registry://artifact/' || id::text "
        "WHERE storage_uri IS NULL"
    )
    op.execute(
        "UPDATE derived_artifacts SET storage_uri = 'registry://derived/' || id::text "
        "WHERE storage_uri IS NULL"
    )
    op.alter_column("derived_artifacts", "source_artifact_id", existing_type=sa.Uuid(), nullable=False)
    op.alter_column("derived_artifacts", "storage_uri", existing_type=sa.Text(), nullable=False)
    for column in (
        "verification_details",
        "status",
        "environment_snapshot",
        "transformation_type",
    ):
        op.drop_column("derived_artifacts", column)
    op.alter_column("model_artifacts", "storage_uri", existing_type=sa.Text(), nullable=False)
    for column in ("archived_at", "verification_details", "status"):
        op.drop_column("model_artifacts", column)
    op.drop_column("model_revisions", "archived_at")
    for column in (
        "description",
        "interpretation_metadata",
        "local_metadata",
        "upstream_metadata",
        "source_type",
    ):
        op.drop_column("models", column)