"""``utils/config_loader.py``：workflow.yaml 读/写/热重载。"""

from __future__ import annotations

import yaml
import pytest


@pytest.fixture(autouse=True)
def isolated_yaml(tmp_path, monkeypatch):
    """每个用例用独立的临时目录作为 config 目录，避免污染真实配置文件。"""
    from kilostar.utils import config_loader

    monkeypatch.setattr(config_loader, "_CONFIG_DIR", tmp_path)
    monkeypatch.setattr(config_loader, "_WORKFLOW_YAML", tmp_path / "workflow.yaml")
    monkeypatch.setattr(config_loader, "_CONFIG_YML", tmp_path / "config.yml")
    monkeypatch.setattr(config_loader, "_SANDBOX_YAML", tmp_path / "sandbox.yaml")
    monkeypatch.setattr(config_loader, "_app_current", None)
    return tmp_path / "workflow.yaml"


def test_get_workflow_config_returns_default_when_file_absent():
    from kilostar.utils.config_loader import get_workflow_config

    config = get_workflow_config()
    assert config.retry.max_attempts == 5


def test_get_workflow_config_reads_from_disk(isolated_yaml):
    isolated_yaml.write_text("retry:\n  max_attempts: 12\n", encoding="utf-8")

    from kilostar.utils.config_loader import reload_workflow_config

    config = reload_workflow_config()
    assert config.retry.max_attempts == 12


def test_save_workflow_config_writes_yaml_and_reloads(isolated_yaml):
    from kilostar.utils.config_loader import (
        save_workflow_config,
        get_workflow_config,
        WorkflowConfig,
        RetryConfig,
    )

    new_config = WorkflowConfig(retry=RetryConfig(max_attempts=20))
    save_workflow_config(new_config)

    on_disk = yaml.safe_load(isolated_yaml.read_text(encoding="utf-8"))
    assert on_disk == {"retry": {"max_attempts": 20}}

    # 热重载：再次 get 应直接拿到新值
    assert get_workflow_config().retry.max_attempts == 20


def test_max_attempts_validation_rejects_out_of_range():
    from kilostar.utils.config_loader import RetryConfig

    with pytest.raises(Exception):
        RetryConfig(max_attempts=0)

    with pytest.raises(Exception):
        RetryConfig(max_attempts=200)


def test_reload_picks_up_external_file_changes(isolated_yaml):
    """模拟运维直接改 yaml 文件，reload 后引擎能拿到新值。"""
    isolated_yaml.write_text("retry:\n  max_attempts: 3\n", encoding="utf-8")

    from kilostar.utils.config_loader import (
        get_workflow_config,
        reload_workflow_config,
    )

    assert reload_workflow_config().retry.max_attempts == 3

    isolated_yaml.write_text("retry:\n  max_attempts: 30\n", encoding="utf-8")
    assert reload_workflow_config().retry.max_attempts == 30
    # get_workflow_config 也读到最新
    assert get_workflow_config().retry.max_attempts == 30