from __future__ import annotations

import os
from collections.abc import Iterator
from pathlib import Path

import pytest

# Unit tests never touch a real database, Redis or LLM provider. Setting these
# before any import keeps `packages.shared.config` deterministic.
os.environ.setdefault("APP_ENV", "local")
os.environ.setdefault("JWT_SECRET", "unit-test-secret-value-not-used-in-any-real-env")
os.environ.setdefault("DEEPSEEK_API_KEY", "unit-test-placeholder")

REPO_ROOT = Path(__file__).resolve().parents[1]


@pytest.fixture
def repo_root() -> Path:
    return REPO_ROOT


@pytest.fixture
def prompts_dir(tmp_path: Path) -> Iterator[Path]:
    """A minimal on-disk prompt tree with a clean, cacheable system prefix."""
    root = tmp_path / "prompts"
    (root / "agent_chat").mkdir(parents=True)
    (root / "agent_chat" / "v1.txt").write_text(
        "[system]\n你是穿搭顾问助手。只回答穿搭相关问题。\n\n[user]\n{user_input}\n",
        encoding="utf-8",
    )
    (root / "agent_chat" / "v2.txt").write_text(
        "[system]\n你是穿搭顾问助手。回答要具体可执行。\n\n[user]\n{user_input}\n",
        encoding="utf-8",
    )
    yield root