"""Versioned album naming proposals (US03-03).

Revision ID: 0006_album_proposals
Revises: 0005_safety_analysis
Create Date: 2026-08-15
"""

import sqlalchemy as sa
from alembic import op

revision = "0006_album_proposals"
down_revision = "0005_safety_analysis"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "album_proposals",
        sa.Column("id", sa.String(), primary_key=True),
        # The album label (US03-01 identity) this proposal names. One current
        # proposal per album; superseded ones keep their history in the events.
        sa.Column("album", sa.String(), nullable=False),
        sa.Column("proposed_name", sa.String(), nullable=True),
        sa.Column("final_name", sa.String(), nullable=True),
        sa.Column("rationale", sa.String(), nullable=True),
        sa.Column("confidence", sa.Float(), nullable=True),
        # pending | proposed | edited | approved | error
        sa.Column("status", sa.String(), nullable=False, server_default="pending"),
        sa.Column("error_code", sa.String(), nullable=True),
        sa.Column("error_message", sa.String(), nullable=True),
        # The US03-01 evidence content hash the proposal was generated from; a
        # different current value means the proposal is stale.
        sa.Column("evidence_version", sa.String(), nullable=True),
        sa.Column("model", sa.String(), nullable=True),
        sa.Column("prompt_version", sa.String(), nullable=True),
        sa.Column("raw_response", sa.String(), nullable=True),
        # Optimistic concurrency: an edit/approval must present this version.
        sa.Column("version", sa.Integer(), nullable=False, server_default="1"),
        sa.Column("approved_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.text("CURRENT_TIMESTAMP"),
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.text("CURRENT_TIMESTAMP"),
        ),
    )
    op.create_index("ix_album_proposals_album", "album_proposals", ["album"], unique=True)
    op.create_index("ix_album_proposals_status", "album_proposals", ["status"])


def downgrade() -> None:
    op.drop_table("album_proposals")