"""rename glm provider code to dashscope

Revision ID: 20260429_rename_glm_provider_to_dashscope
Revises: 20260429_add_ai_call_trace_fields
Create Date: 2026-04-29
"""

from __future__ import annotations

import json
from typing import Any

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_rename_glm_provider_to_dashscope"
down_revision = "20260429_add_ai_call_trace_fields"
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 _load_json(value: Any) -> Any:
    if isinstance(value, str):
        try:
            return json.loads(value)
        except Exception:
            return value
    return value


def _replace_provider_code(value: Any) -> tuple[Any, bool]:
    changed = False
    if isinstance(value, dict):
        result: dict[Any, Any] = {}
        for raw_key, raw_value in value.items():
            key = "dashscope" if raw_key == "glm" else raw_key
            next_value, child_changed = _replace_provider_code(raw_value)
            result[key] = next_value
            changed = changed or child_changed or key != raw_key
        return result, changed
    if isinstance(value, list):
        result = []
        for item in value:
            next_value, child_changed = _replace_provider_code(item)
            result.append(next_value)
            changed = changed or child_changed
        return result, changed
    if value == "glm":
        return "dashscope", True
    return value, False


def _migrate_json_table(bind, table_name: str, column_name: str) -> None:
    if not _table_exists(bind, table_name) or not _column_exists(bind, table_name, column_name):
        return
    table = sa.table(
        table_name,
        sa.column("id", sa.Integer()),
        sa.column(column_name, _json_type(bind)),
    )
    rows = bind.execute(sa.select(table.c.id, table.c[column_name])).all()
    for row_id, raw_value in rows:
        payload = _load_json(raw_value)
        next_payload, changed = _replace_provider_code(payload)
        if changed:
            bind.execute(
                table.update().where(table.c.id == row_id).values({column_name: next_payload})
            )


def upgrade() -> None:
    bind = op.get_bind()
    _migrate_json_table(bind, "integrations", "config")
    _migrate_json_table(bind, "ai_call_logs", "routing_meta")

    if _table_exists(bind, "ai_call_logs") and _column_exists(bind, "ai_call_logs", "provider"):
        op.execute("UPDATE ai_call_logs SET provider = 'dashscope' WHERE provider = 'glm'")


def downgrade() -> None:
    # Intentionally irreversible: glm was a misleading historical provider code.
    pass