# -*- coding: utf-8 -*-
"""任务监控线程的启动契约。

背景（回归）：Flask 单体时代该线程由模块级代码拉起，8446166「移除 Flask」
把实现搬进 services 包时启动点丢失，`_task_monitor_loop` 此后全项目零引用，
监控循环一次都没跑过。这里钉住两条契约：
  1. 启动是幂等的（多 worker / 多次构建应用只起一个线程）；
  2. 应用 lifespan 会启动它（否则心跳超时暂停、超时取消、账本孤儿对账
     等全部静默失效）。
"""
from fastapi.testclient import TestClient

from core import db as core_db
from services import tasks as services_tasks


def _isolate_data_dir(monkeypatch, tmp_path):
    """把站点数据目录指向临时目录，避免 lifespan 的 init_db 触碰真实库。"""
    from auth_system import db as auth_db

    data_dir = tmp_path / 'data'
    data_dir.mkdir(parents=True, exist_ok=True)
    for mod in (auth_db, core_db):
        monkeypatch.setattr(mod, 'DATA_DIR', data_dir, raising=False)
        monkeypatch.setattr(mod, 'DB_PATH', data_dir / 'site.db', raising=False)
    monkeypatch.setattr(auth_db, 'BACKUP_DIR', data_dir / 'backups', raising=False)
    monkeypatch.setattr(auth_db, 'SECRET_KEY_PATH', data_dir / 'secret.key', raising=False)
    return data_dir


def test_start_task_monitor_is_idempotent(monkeypatch):
    """重复调用只启动一次（空转的 loop 替身，避免真的跑监控循环）。"""
    monkeypatch.setattr(services_tasks, '_MONITOR_STARTED', False)
    monkeypatch.setattr(services_tasks, '_task_monitor_loop', lambda: None)

    assert services_tasks.start_task_monitor() is True
    assert services_tasks.start_task_monitor() is False


def test_lifespan_starts_monitor(monkeypatch, tmp_path):
    """应用 lifespan 启动监控线程（该启动点曾在迁移中丢失）。"""
    from web.app import create_app

    _isolate_data_dir(monkeypatch, tmp_path)
    calls: list[int] = []
    monkeypatch.setattr(
        services_tasks, 'start_task_monitor', lambda: calls.append(1) or True)

    with TestClient(create_app()) as client:
        assert client.get('/health').status_code == 200

    assert calls == [1]


def test_lifespan_can_skip_monitor(monkeypatch, tmp_path):
    """start_monitor=False 时不启动（供测试或嵌入式构建使用）。"""
    from web.app import create_app

    _isolate_data_dir(monkeypatch, tmp_path)
    calls: list[int] = []
    monkeypatch.setattr(
        services_tasks, 'start_task_monitor', lambda: calls.append(1) or True)

    with TestClient(create_app(start_monitor=False)) as client:
        assert client.get('/health').status_code == 200

    assert calls == []