"""0005 snapshots

Revision ID: 0005
Revises: 0004
Create Date: 2026-04-07
"""

from alembic import op
import sqlalchemy as sa

revision = "0005"
down_revision = "0004"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Content-addressed storage: one row per unique file content
    op.create_table(
        "snapshot_contents",
        sa.Column("sha256", sa.String(64), primary_key=True),
        sa.Column("content", sa.Text(), nullable=False),
        sa.Column("size", sa.Integer(), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
    )

    # Each snapshot capture event points to a content row
    op.create_table(
        "config_snapshots",
        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
        sa.Column(
            "device_id",
            sa.Integer(),
            sa.ForeignKey("devices.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "sha256",
            sa.String(64),
            sa.ForeignKey("snapshot_contents.sha256"),
            nullable=False,
        ),
        sa.Column("label", sa.String(255), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index(
        "ix_config_snapshots_device_created",
        "config_snapshots",
        ["device_id", "created_at"],
    )


def downgrade() -> None:
    op.drop_index("ix_config_snapshots_device_created", table_name="config_snapshots")
    op.drop_table("config_snapshots")
    op.drop_table("snapshot_contents")