"""统一配置加载 (AppConfig) 的测试：多文件联合加载、缺失文件默认值、schema 校验、热重载。"""

from __future__ import annotations

import yaml
import pytest

from kilostar.utils.config_loader import (
    AppConfig,
    AppInfo,
    WorkflowConfig,
    RetryConfig,
    SandboxConfig,
    load_app_config,
    get_app_config,
    reload_app_config,
    get_workflow_config,
    reload_workflow_config,
    save_workflow_config,
)


@pytest.fixture(autouse=True)
def isolated_config(tmp_path, monkeypatch):
    """隔离配置目录，每个测试用独立临时目录。"""
    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


# ─── 多文件联合加载 ───


class TestLoadAppConfig:
    def test_all_files_present(self, isolated_config):
        (isolated_config / "config.yml").write_text(
            "version: v0.2.0\nname: TestStar\n", encoding="utf-8"
        )
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 10\n", encoding="utf-8"
        )
        (isolated_config / "sandbox.yaml").write_text(
            "sandbox:\n  enabled: false\n", encoding="utf-8"
        )

        cfg = load_app_config(isolated_config)
        assert cfg.app.version == "v0.2.0"
        assert cfg.app.name == "TestStar"
        assert cfg.workflow.retry.max_attempts == 10
        assert cfg.sandbox.enabled is False

    def test_no_files_returns_defaults(self, isolated_config):
        cfg = load_app_config(isolated_config)
        assert cfg.app.version == "0.1.1-alpha"
        assert cfg.app.name == "Kilostar"
        assert cfg.workflow.retry.max_attempts == 5
        assert cfg.sandbox.enabled is True

    def test_partial_files_fills_defaults(self, isolated_config):
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 8\n", encoding="utf-8"
        )
        cfg = load_app_config(isolated_config)
        assert cfg.workflow.retry.max_attempts == 8
        assert cfg.app.version == "0.1.1-alpha"
        assert cfg.sandbox.enabled is True

    def test_sandbox_without_wrapper_key(self, isolated_config):
        """sandbox.yaml 不带顶层 'sandbox:' key 也能正常解析。"""
        (isolated_config / "sandbox.yaml").write_text(
            "enabled: false\n", encoding="utf-8"
        )
        cfg = load_app_config(isolated_config)
        assert cfg.sandbox.enabled is False


# ─── Schema 校验 ───


class TestSchemaValidation:
    def test_invalid_retry_max_attempts_type(self, isolated_config):
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: not_a_number\n", encoding="utf-8"
        )
        with pytest.raises(Exception):
            load_app_config(isolated_config)

    def test_retry_max_attempts_out_of_range(self, isolated_config):
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 999\n", encoding="utf-8"
        )
        with pytest.raises(Exception):
            load_app_config(isolated_config)

    def test_config_yml_extra_fields_ignored(self, isolated_config):
        (isolated_config / "config.yml").write_text(
            "version: v1.0.0\nname: X\nunknown_field: hello\n", encoding="utf-8"
        )
        cfg = load_app_config(isolated_config)
        assert cfg.app.version == "v1.0.0"


# ─── 单例与热重载 ───


class TestSingletonAndReload:
    def test_get_app_config_is_singleton(self, isolated_config):
        cfg1 = get_app_config()
        cfg2 = get_app_config()
        assert cfg1 is cfg2

    def test_reload_full(self, isolated_config):
        get_app_config()
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 42\n", encoding="utf-8"
        )
        cfg = reload_app_config()
        assert cfg.workflow.retry.max_attempts == 42

    def test_reload_section_sandbox(self, isolated_config):
        get_app_config()
        (isolated_config / "sandbox.yaml").write_text(
            "sandbox:\n  enabled: false\n", encoding="utf-8"
        )
        cfg = reload_app_config(section="sandbox")
        assert cfg.sandbox.enabled is False
        assert cfg.workflow.retry.max_attempts == 5

    def test_reload_section_workflow(self, isolated_config):
        get_app_config()
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 77\n", encoding="utf-8"
        )
        cfg = reload_app_config(section="workflow")
        assert cfg.workflow.retry.max_attempts == 77


# ─── 向后兼容性 ───


class TestBackwardCompat:
    def test_get_workflow_config_delegates(self, isolated_config):
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 15\n", encoding="utf-8"
        )
        wf = get_workflow_config()
        assert wf.retry.max_attempts == 15

    def test_reload_workflow_config_refreshes(self, isolated_config):
        get_workflow_config()
        (isolated_config / "workflow.yaml").write_text(
            "retry:\n  max_attempts: 33\n", encoding="utf-8"
        )
        wf = reload_workflow_config()
        assert wf.retry.max_attempts == 33

    def test_save_workflow_config_persists(self, isolated_config):
        save_workflow_config(WorkflowConfig(retry=RetryConfig(max_attempts=25)))
        on_disk = yaml.safe_load(
            (isolated_config / "workflow.yaml").read_text(encoding="utf-8")
        )
        assert on_disk == {"retry": {"max_attempts": 25}}
        assert get_workflow_config().retry.max_attempts == 25