"""initial hub persistence

Revision ID: 0001

Frozen, explicit baseline. This revision used to run
``Base.metadata.create_all()``, which builds the schema from the *current*
models: on an empty database it created tables/columns that 0002..0018 then
tried to create again (first collision: ``datasets.raw_sha256`` in 0002), so
``alembic upgrade head`` could never run from zero.

This body reproduces exactly what 0001 created on the databases that went
through the real history: the seven base tables, *before* 0002 added
``datasets.raw_sha256`` and 0006 added the agent status/timestamp columns.
Constraint and index names match the ones those databases already have
(PostgreSQL defaults for PK/FK/UNIQUE, ``ix_<table>_<column>`` for indexes).

Databases already at 0001 or later never re-run this revision, so changing
its body only affects new installations. It must never import the ORM
models again: a migration describes one point in history, not the present.
"""
from alembic import op
import sqlalchemy as sa

revision = "0001"
down_revision = None
branch_labels = depends_on = None


def upgrade():
    op.create_table(
        "tenants",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("name", sa.String(128), nullable=False, unique=True),
    )
    op.create_table(
        "datasets",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("kind", sa.String(32), nullable=False),
        sa.Column("provider", sa.String(128), nullable=False),
        sa.Column("sha256", sa.String(64), nullable=False),
        sa.Column("version_label", sa.String(256), nullable=False),
        sa.Column("act", sa.Text(), nullable=False),
        sa.Column("source_url", sa.Text(), nullable=False),
        sa.Column("downloaded_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("status", sa.String(32), nullable=False),
        sa.Column("record_count", sa.Integer(), nullable=False),
        sa.UniqueConstraint("provider", "sha256", name="uq_dataset_provider_hash"),
    )
    op.create_index("ix_datasets_kind", "datasets", ["kind"])
    op.create_index("ix_datasets_status", "datasets", ["status"])
    op.create_table(
        "ncm_entries",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("dataset_id", sa.Integer(), sa.ForeignKey("datasets.id"), nullable=False),
        sa.Column("code", sa.String(16), nullable=False),
        sa.Column("description", sa.Text(), nullable=False),
        sa.Column("valid_from", sa.String(32), nullable=False),
        sa.Column("valid_to", sa.String(32), nullable=False),
        sa.UniqueConstraint("dataset_id", "code", "valid_from", "valid_to", name="uq_ncm_versioned_entry"),
    )
    op.create_index("ix_ncm_entries_dataset_id", "ncm_entries", ["dataset_id"])
    op.create_index("ix_ncm_entries_code", "ncm_entries", ["code"])
    op.create_table(
        "agents",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("tenant_id", sa.Integer(), sa.ForeignKey("tenants.id"), nullable=False),
        sa.Column("name", sa.String(128), nullable=False),
        sa.Column("token_hash", sa.String(64), nullable=False, unique=True),
    )
    op.create_index("ix_agents_tenant_id", "agents", ["tenant_id"])
    op.create_table(
        "classification_cache",
        sa.Column("fingerprint", sa.String(64), primary_key=True),
        sa.Column("tenant_id", sa.Integer(), sa.ForeignKey("tenants.id"), nullable=False),
        sa.Column("result", sa.JSON(), nullable=False),
    )
    op.create_index("ix_classification_cache_tenant_id", "classification_cache", ["tenant_id"])
    op.create_table(
        "classification_requests",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("tenant_id", sa.Integer(), sa.ForeignKey("tenants.id"), nullable=False),
        sa.Column("agent_id", sa.Integer(), sa.ForeignKey("agents.id"), nullable=False),
        sa.Column("fingerprint", sa.String(64), nullable=False, unique=True),
        sa.Column("payload", sa.JSON(), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
    )
    op.create_index("ix_classification_requests_tenant_id", "classification_requests", ["tenant_id"])
    op.create_index("ix_classification_requests_agent_id", "classification_requests", ["agent_id"])
    op.create_table(
        "classification_results",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("request_id", sa.Integer(), sa.ForeignKey("classification_requests.id"), nullable=False, unique=True),
        sa.Column("result", sa.JSON(), nullable=False),
    )


def downgrade():
    for table in ("classification_results", "classification_requests", "classification_cache", "agents", "ncm_entries", "datasets", "tenants"):
        op.drop_table(table)