"""add prompt quality linkage

Revision ID: 20260429_add_prompt_quality_linkage
Revises: 20260429_add_prompt_release_checks
Create Date: 2026-04-29
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa

try:
    from sqlalchemy.dialects.postgresql import JSONB
except Exception:  # pragma: no cover
    JSONB = sa.JSON


revision = "20260429_add_prompt_quality_linkage"
down_revision = "20260429_add_prompt_release_checks"
branch_labels = None
depends_on = None


def _json_type(bind):
    return JSONB() if bind.dialect.name == "postgresql" else sa.JSON()


def _table_exists(bind, table_name: str) -> bool:
    return sa.inspect(bind).has_table(table_name)


def _column_exists(bind, table_name: str, column_name: str) -> bool:
    inspector = sa.inspect(bind)
    if not inspector.has_table(table_name):
        return False
    return any(str(item.get("name") or "") == column_name for item in inspector.get_columns(table_name))


def _index_exists(bind, table_name: str, index_name: str) -> bool:
    if not _table_exists(bind, table_name):
        return False
    return index_name in {str(index.get("name") or "") for index in sa.inspect(bind).get_indexes(table_name)}


def upgrade() -> None:
    bind = op.get_bind()
    table_name = "ai_call_logs"
    if _table_exists(bind, table_name):
        for column_name, column in (
            ("prompt_key", sa.Column("prompt_key", sa.String(length=128), nullable=True)),
            ("prompt_release_id", sa.Column("prompt_release_id", sa.Integer(), nullable=True)),
            ("prompt_source", sa.Column("prompt_source", sa.String(length=32), nullable=True)),
        ):
            if not _column_exists(bind, table_name, column_name):
                op.add_column(table_name, column)
        for index_name, column_names in (
            ("ix_ai_call_logs_prompt_key", ["prompt_key"]),
            ("ix_ai_call_logs_prompt_release_id", ["prompt_release_id"]),
            ("ix_ai_call_logs_prompt_source", ["prompt_source"]),
        ):
            if not _index_exists(bind, table_name, index_name):
                op.create_index(index_name, table_name, column_names, unique=False)

    if not _table_exists(bind, "prompt_golden_cases"):
        op.create_table(
            "prompt_golden_cases",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("prompt_key", sa.String(length=128), nullable=False),
            sa.Column("case_name", sa.String(length=255), nullable=False),
            sa.Column("status", sa.String(length=24), nullable=False, server_default="active"),
            sa.Column("input_payload", _json_type(bind), nullable=True),
            sa.Column("expected_contract", _json_type(bind), nullable=True),
            sa.Column("expected_contains", sa.Text(), nullable=True),
            sa.Column("source", sa.String(length=48), nullable=False, server_default="manual"),
            sa.Column("source_ai_call_log_id", sa.Integer(), nullable=True),
            sa.Column("created_by", sa.BigInteger(), nullable=True),
            sa.Column("notes", sa.Text(), nullable=True),
            sa.Column("created_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.Column("updated_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
        )
        for index_name, column_names in (
            ("ix_prompt_golden_cases_tenant_id", ["tenant_id"]),
            ("ix_prompt_golden_cases_prompt_key", ["prompt_key"]),
            ("ix_prompt_golden_cases_status", ["status"]),
            ("ix_prompt_golden_cases_source", ["source"]),
            ("ix_prompt_golden_cases_source_ai_call_log_id", ["source_ai_call_log_id"]),
            ("ix_prompt_golden_cases_created_by", ["created_by"]),
        ):
            op.create_index(index_name, "prompt_golden_cases", column_names, unique=False)


def downgrade() -> None:
    bind = op.get_bind()
    if _table_exists(bind, "prompt_golden_cases"):
        for index_name in (
            "ix_prompt_golden_cases_created_by",
            "ix_prompt_golden_cases_source_ai_call_log_id",
            "ix_prompt_golden_cases_source",
            "ix_prompt_golden_cases_status",
            "ix_prompt_golden_cases_prompt_key",
            "ix_prompt_golden_cases_tenant_id",
        ):
            if _index_exists(bind, "prompt_golden_cases", index_name):
                op.drop_index(index_name, table_name="prompt_golden_cases")
        op.drop_table("prompt_golden_cases")

    table_name = "ai_call_logs"
    if _table_exists(bind, table_name):
        for index_name in (
            "ix_ai_call_logs_prompt_source",
            "ix_ai_call_logs_prompt_release_id",
            "ix_ai_call_logs_prompt_key",
        ):
            if _index_exists(bind, table_name, index_name):
                op.drop_index(index_name, table_name=table_name)
        for column_name in ("prompt_source", "prompt_release_id", "prompt_key"):
            if _column_exists(bind, table_name, column_name):
                op.drop_column(table_name, column_name)