"""V29 能识别先于迁移版本登记的兼容字段。"""

import importlib.util
from pathlib import Path
from types import SimpleNamespace

import pytest
from sqlalchemy.dialects.mysql import DATETIME, TINYINT, VARCHAR


def migration(monkeypatch, columns):
    path = Path(__file__).resolve().parents[2] / "alembic/versions/29b0c1d2e3f4_receipt_manual_confirmation.py"
    spec = importlib.util.spec_from_file_location("receipt_confirmation_migration", path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    statements = []
    bind = SimpleNamespace(execute=lambda sql: statements.append(str(sql)))
    monkeypatch.setattr(module, "op", SimpleNamespace(get_bind=lambda: bind))
    monkeypatch.setattr(module, "inspect", lambda _: SimpleNamespace(get_columns=lambda table: columns))
    return module, statements


def existing_columns():
    return [
        {"name": "confirmation_status", "type": TINYINT(), "nullable": False, "default": "'0'"},
        {"name": "confirmed_by", "type": VARCHAR(64, collation="utf8mb4_general_ci"), "nullable": True},
        {"name": "confirmed_at", "type": DATETIME(), "nullable": True},
        {"name": "confirmed_revision", "type": VARCHAR(64), "nullable": True},
    ]


def test_兼容已有字段且仍执行权限和参数初始化(monkeypatch):
    module, statements = migration(monkeypatch, existing_columns())
    module.upgrade()
    assert len(statements) == 4
    assert all(not statement.startswith("ALTER TABLE") for statement in statements)
    assert any("receipt.confirmation.enabled" in statement for statement in statements)


def test_已有字段不完整时拒绝迁移(monkeypatch):
    module, statements = migration(monkeypatch, existing_columns()[:1])
    with pytest.raises(RuntimeError, match="字段不完整"):
        module.upgrade()
    assert not statements