import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "scripts"))

from _env import credentials, load_env  # noqa: E402

KEYS = ("DANBOORU_API_KEY", "DANBOORU_LOGIN")


@pytest.fixture(autouse=True)
def clean_environment(monkeypatch):
    for key in KEYS:
        monkeypatch.delenv(key, raising=False)


def write(tmp_path: Path, text: str) -> Path:
    path = tmp_path / ".env"
    path.write_text(text, encoding="utf-8")
    return path


def test_missing_file_is_not_an_error(tmp_path):
    assert credentials(env_file=tmp_path / "absent") == (None, None)


def test_reads_a_pair_from_the_file(tmp_path):
    env = write(tmp_path, "DANBOORU_LOGIN=someone\nDANBOORU_API_KEY=secret\n")
    assert credentials(env_file=env) == ("secret", "someone")


def test_strips_quotes_comments_and_stray_lines(tmp_path):
    env = write(
        tmp_path,
        "# a comment\n"
        '\nDANBOORU_LOGIN = "spaced-and-quoted"\n'
        "DANBOORU_API_KEY='single'\n"
        "NOT_AN_ASSIGNMENT\n",
    )
    assert credentials(env_file=env) == ("single", "spaced-and-quoted")


def test_empty_values_mean_anonymous(tmp_path):
    # 模板文件就是这个形态,它必须表现为「没填」而不是「填了空字符串」。
    env = write(tmp_path, "DANBOORU_LOGIN=\nDANBOORU_API_KEY=\n")
    assert credentials(env_file=env) == (None, None)


def test_command_line_beats_the_file(tmp_path):
    env = write(tmp_path, "DANBOORU_LOGIN=file\nDANBOORU_API_KEY=file\n")
    assert credentials("cli-key", "cli-login", env_file=env) == ("cli-key", "cli-login")


def test_exported_environment_beats_the_file(tmp_path, monkeypatch):
    monkeypatch.setenv("DANBOORU_LOGIN", "shell")
    monkeypatch.setenv("DANBOORU_API_KEY", "shell")
    env = write(tmp_path, "DANBOORU_LOGIN=file\nDANBOORU_API_KEY=file\n")
    assert credentials(env_file=env) == ("shell", "shell")


@pytest.mark.parametrize("present", KEYS)
def test_half_a_pair_is_refused(tmp_path, present):
    # 只给一个会拼出 api_key=None 的请求,几秒后返回 401 —— 看起来像网络问题。
    env = write(tmp_path, f"{present}=only-this\n")
    with pytest.raises(SystemExit, match="必须同时提供"):
        credentials(env_file=env)


def test_load_env_does_not_overwrite_unrelated_variables(tmp_path, monkeypatch):
    monkeypatch.setenv("PATH_LIKE", "original")
    load_env(write(tmp_path, "PATH_LIKE=replaced\n"))
    import os

    assert os.environ["PATH_LIKE"] == "original"