"""Shared fixtures.

Unit tests must stay hermetic: no database, no Redis, no network. Anything that
needs real infrastructure belongs in ``tests/integration`` behind the
``integration`` marker.
"""

from __future__ import annotations

import shutil
from pathlib import Path

import pytest

# 单测里给出确定的配置，避免开发者本机 .env 的取值渗进断言里。
# 必须在导入任何读取 Settings 的模块之前生效，故用 autouse=True + session 作用域。
_TEST_ENV = {
    "APP_ENV": "local",
    "LOG_JSON": "false",
    "JWT_SECRET": "unit-test-secret-not-used-outside-tests-0123456789",
    "DEEPSEEK_API_KEY": "unit-test-placeholder-never-called",
    "LLM_DAILY_BUDGET_ENABLED": "true",
}


@pytest.fixture(scope="session", autouse=True)
def _isolate_settings() -> None:
    import os

    for key, value in _TEST_ENV.items():
        os.environ.setdefault(key, value)


@pytest.fixture(scope="session")
def repo_root() -> Path:
    return Path(__file__).resolve().parent.parent


@pytest.fixture
def prompts_dir(repo_root: Path, tmp_path: Path) -> Path:
    """A writable copy of the shipped prompts, plus a second version of agent_chat.

    Copying rather than pointing at ``prompts/`` keeps two properties that matter:
    tests can add versions without dirtying the repo, and the shipped prompts are
    still the ones under test (a hand-written fixture would drift from production).
    """
    target = tmp_path / "prompts"
    shutil.copytree(repo_root / "prompts", target)

    v2 = target / "agent_chat" / "v2.txt"
    v2.write_text(
        "[system]\n"
        "你是「美搭」的穿搭顾问助手（v2 试验版本，仅用于测试版本切换）。\n"
        "规则与 v1 相同，此处仅改动固定前缀以便断言两个版本不同。\n"
        "\n"
        "[user]\n"
        "{user_input}\n",
        encoding="utf-8",
    )
    return target