"""JSON 序列化与解析的规范化行为 [题面 附件2 4.1/5.1]。"""

import json

import pytest

from referee.jsonio import (RequestFormatError, dumps, format_number,
                            parse_request_object)


@pytest.mark.parametrize("value,text", [
    (105, "105"), (0, "0"), (5.0, "5"), (105.5, "105.5"),
    (5282.843, "5282.843"),          # 微秒时刻的最短表示
    (0.300001, "0.300001"),
    (123.45, "123.45"),              # svd_deg 两位小数
    (True, None),                    # 布尔不是数值，放这里只为参数化完整
])
def test_format_number(value, text):
    if text is None:
        return
    assert format_number(value) == text


def test_dumps_matches_official_number_style():
    body = {"accepted": True, "virtual_time_s": 105.0,
            "real_timestamp_ms": 1760000000000, "svd_deg": 123.45,
            "note": "中文", "ok": False, "none": None, "list": [1, 2.5]}
    text = dumps(body)
    assert '"virtual_time_s":105' in text          # 不输出 105.0
    assert '"svd_deg":123.45' in text
    assert '"real_timestamp_ms":1760000000000' in text
    assert '"note":"中文"' in text                  # 非 ASCII 不转义
    assert json.loads(text) == body                 # 解析后语义不变


@pytest.mark.parametrize("raw", [
    b'{"a":1,"a":2}',                # 重复键
    b'\xef\xbb\xbf{}',               # BOM
    b'[]', b'"str"', b'3', b'null',  # 非对象
    b'{"a":NaN}', b'{"a":Infinity}',
    b'{"a":' + b'[' * 17 + b'0' + b']' * 17 + b'}',   # 深度 17
    b'{"a":', b'', b'\xff',
])
def test_parse_rejections(raw):
    with pytest.raises(RequestFormatError):
        parse_request_object(raw)


def test_parse_depth_16_is_legal():
    payload = json.loads(b'{"extra":' + b'[' * 15 + b'0' + b']' * 15 + b'}')
    assert parse_request_object(json.dumps(payload).encode()) == payload


def test_parse_rejects_duplicated_nested_keys():
    with pytest.raises(RequestFormatError):
        parse_request_object(b'{"position":{"x":1,"x":2}}')