"""计价测试（T-P3）：峰谷边界（假时钟 ±1 分钟）/ 毫元取整不漂移 / margin 恒等式。"""
import time

import pytest

from gateway.proxy.config import ModelPrice, ProxyConfig, build_proxy_config
from gateway.proxy.pricing import compute, is_offpeak
from gateway.settings import DEFAULTS


@pytest.fixture()
def cfg():
    return build_proxy_config(DEFAULTS)


# ---------------- 峰谷窗口 ----------------

def _ts(y, mo, d, h, mi):
    return time.mktime((y, mo, d, h, mi, 0, 0, 0, -1))


def test_offpeak_boundaries_plus_minus_one_minute():
    """窗口 [08:30, 23:59]：边界 ±1 分钟翻转。"""
    base = _ts(2026, 9, 1, 8, 29)
    assert is_offpeak(base, "08:30", "23:59") is True             # 08:29 空闲
    assert is_offpeak(base + 60, "08:30", "23:59") is False       # 08:30 高峰
    base2 = _ts(2026, 9, 1, 23, 58)
    assert is_offpeak(base2, "08:30", "23:59") is False           # 23:58 高峰
    assert is_offpeak(base2 + 120, "08:30", "23:59") is True      # 00:00 次日空闲


def test_offpeak_overnight_window():
    """跨午夜窗口 [23:00, 06:00]：中午空闲、深夜高峰。"""
    noon = _ts(2026, 9, 1, 12, 0)
    deep = _ts(2026, 9, 1, 23, 30)
    early = _ts(2026, 9, 1, 5, 59)
    assert is_offpeak(noon, "23:00", "06:00") is True
    assert is_offpeak(deep, "23:00", "06:00") is False
    assert is_offpeak(early, "23:00", "06:00") is False


def test_offpeak_invalid_window_falls_back():
    """非法窗口回落默认 08:30-23:59。"""
    noon = _ts(2026, 9, 1, 12, 0)
    assert is_offpeak(noon, "garbage", "!!") is False
    assert is_offpeak(_ts(2026, 9, 1, 7, 0), "garbage", "!!") is True


# ---------------- 计算与取整 ----------------

USAGE = {"in_miss": 3_000_000, "in_hit": 1_000_000, "out": 800_000}


def test_compute_peak_math_exact(cfg):
    """高峰：成本/售价逐项可手算（黄金用例 #1）。

    deepseek-chat：in_miss=3000, in_hit=100, out=9000（毫元/1M）
    成本 = 3M×3000/1M + 1M×100/1M + 0.8M×9000/1M = 9000+100+7200 = 16300 毫元
    售价 = 9000×0.5 + 100×0.5 + 7200×0.8 = 4500+50+5760 = 10310 毫元
    """
    ts = _ts(2026, 9, 1, 12, 0)   # 高峰
    r = compute(USAGE, "deepseek-chat", ts, cfg)
    assert r["upstream_cost_milli"] == 16300
    assert r["charged_milli"] == 10310
    assert r["margin_milli"] == r["charged_milli"] - r["upstream_cost_milli"]


def test_compute_offpeak_half_cost(cfg):
    """空闲：上游成本半价（offpeak_factor=0.5），售价不变（黄金用例 #2）。"""
    ts = _ts(2026, 9, 2, 3, 0)    # 空闲
    r = compute(USAGE, "deepseek-chat", ts, cfg)
    assert r["upstream_cost_milli"] == 8150            # 16300 × 0.5
    assert r["charged_milli"] == 10310
    assert r["margin_milli"] == 2160


def test_margin_identity_holds_for_golden_cases(cfg):
    """margin = charged - cost 恒等式（10 组黄金用例，量级/零/大数扫）。"""
    ts = _ts(2026, 9, 1, 12, 0)
    cases = [
        {"in_miss": 0, "in_hit": 0, "out": 0},
        {"in_miss": 1, "in_hit": 0, "out": 0},
        {"in_miss": 0, "in_hit": 1, "out": 0},
        {"in_miss": 0, "in_hit": 0, "out": 1},
        {"in_miss": 1000, "in_hit": 0, "out": 0},
        {"in_miss": 0, "in_hit": 1000, "out": 0},
        {"in_miss": 0, "in_hit": 0, "out": 4096},
        {"in_miss": 3500, "in_hit": 1500, "out": 800},
        {"in_miss": 50_000, "in_hit": 10_000, "out": 10_000},   # 智能体任务
        {"in_miss": 1_000_000, "in_hit": 1_000_000, "out": 100_000},
    ]
    for usage in cases:
        r = compute(usage, "deepseek-chat", ts, cfg)
        assert r["margin_milli"] == r["charged_milli"] - r["upstream_cost_milli"]
        assert r["upstream_cost_milli"] >= 0 and r["charged_milli"] >= 0
    # 零用量 -> 三值全零
    assert compute(cases[0], "deepseek-chat", ts, cfg) == {
        "upstream_cost_milli": 0, "charged_milli": 0, "margin_milli": 0}


def test_no_drift_integer_only(cfg):
    """取整不漂移：分项 round 后求和，重复计算结果稳定一致。"""
    ts = _ts(2026, 9, 1, 12, 0)
    usage = {"in_miss": 123_456, "in_hit": 65_432, "out": 7_777}
    r1 = compute(usage, "deepseek-chat", ts, cfg)
    r2 = compute(usage, "deepseek-chat", ts, cfg)
    assert r1 == r2
    for v in r1.values():
        assert isinstance(v, int)


def test_unknown_model_free(cfg):
    """未配置价格的模型 -> 三值零（调用方可拦截）。"""
    ts = _ts(2026, 9, 1, 12, 0)
    assert compute(USAGE, "no-such-model", ts, cfg) == {
        "upstream_cost_milli": 0, "charged_milli": 0, "margin_milli": 0}


def test_config_milli_conversion_no_drift():
    """配置换算唯一性：元/1M 浮点 -> 毫元/1M 整数只发生一次。"""
    c = build_proxy_config({"proxy": {"pricing": {
        "m1": {"in_miss": 0.003, "in_hit": 0.0001, "out": 0.009},
        "m2": {"in_miss": 12.3456, "out": 1.5}}}})
    assert c.price("m1").in_miss == 3
    assert c.price("m1").in_hit == 1      # 0.0001 元 -> 0.1 毫元 -> 取整 0 -> 触发缺省 max(1, miss//30)
    # in_hit 缺省 = in_miss//30（D-P3）：0.003 元 -> 3 毫元 -> 0（太小），显式补齐后重验
    c2 = build_proxy_config({"proxy": {"pricing": {
        "m1": {"in_miss": 3.0, "in_hit": 0.1, "out": 9.0},
        "m2": {"in_miss": 12.3456, "out": 1.5}}}})
    assert c2.price("m2").in_miss == 12346
    assert c2.price("m2").in_hit == 12346 // 30        # 411