"""Whether the employee found an assistant answer useful.

Revision ID: 512
Revises: 511
Create Date: 2026-08-18

The assistant could file a ticket, propose a flow and answer from the knowledge
base, but nothing ever asked the one question that says whether any of it
landed: was this useful? Deflection counted tickets NOT filed, which measures
avoidance rather than success — an employee who gives up is indistinguishable
from one who got their answer.

One row per verdict, keyed to the message so a bad answer can be read back with
the question that produced it and the tools it used. That pairing is what turns
「没用」 into a fixable knowledge gap instead of a number on a dashboard.
"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

from app.core.migration_helpers import id_type_for, table_kw_for

revision = "512"
down_revision = "511"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "assistant_message_feedback",
        sa.Column("id", id_type_for(), primary_key=True),
        sa.Column(
            "message_id",
            id_type_for("assistant_messages"),
            sa.ForeignKey("assistant_messages.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "person_id",
            id_type_for("identity_persons"),
            sa.ForeignKey("identity_persons.id"),
            nullable=False,
        ),
        # 'helpful' | 'unhelpful' — a two-value verdict on purpose: a five-star
        # scale collects shrugs, and the only actionable signal is "this did
        # not work for me".
        sa.Column("verdict", sa.String(16), nullable=False),
        sa.Column("note", sa.Text(), nullable=True),
        sa.Column("trace_id", sa.String(64), nullable=True),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
            onupdate=sa.func.now(),
        ),
        # One verdict per person per message: tapping again changes the mind
        # already recorded rather than stuffing the ballot.
        sa.UniqueConstraint(
            "message_id", "person_id", name="uq_assistant_feedback_message_person",
        ),
        **table_kw_for("assistant_message_feedback"),
    )
    op.create_index(
        "ix_assistant_feedback_verdict_created",
        "assistant_message_feedback",
        ["verdict", "created_at"],
    )


def downgrade() -> None:
    op.drop_index(
        "ix_assistant_feedback_verdict_created",
        table_name="assistant_message_feedback",
    )
    op.drop_table("assistant_message_feedback")