import json
import time

import pytest


def _percentile_ms(sorted_ms, p):
    n = len(sorted_ms)
    if n == 0:
        return 0.0
    if n == 1:
        return float(sorted_ms[0])
    k = (n - 1) * (p / 100.0)
    lo = int(k)
    hi = min(lo + 1, n - 1)
    w = k - lo
    return sorted_ms[lo] * (1 - w) + sorted_ms[hi] * w


@pytest.mark.slow
@pytest.mark.timeout(300)
def test_nft_perf_01_single_image_latency_p95(
    warm_engine, http_client, image_small
):
    times_ms = []
    for _ in range(10):
        t0 = time.perf_counter()
        r = http_client.post(
            "/detect",
            files={"file": ("img.jpg", image_small, "image/jpeg")},
            timeout=120,
        )
        elapsed_ms = (time.perf_counter() - t0) * 1000.0
        assert r.status_code == 200
        times_ms.append(elapsed_ms)
    sorted_ms = sorted(times_ms)
    p50 = _percentile_ms(sorted_ms, 50)
    p95 = _percentile_ms(sorted_ms, 95)
    p99 = _percentile_ms(sorted_ms, 99)
    print(
        "nft_perf_01_csv,run_ms,"
        + ",".join(f"{x:.2f}" for x in sorted_ms)
        + f",p50,{p50:.2f},p95,{p95:.2f},p99,{p99:.2f}"
    )
    assert p95 < 5000.0


@pytest.mark.slow
@pytest.mark.timeout(300)
def test_nft_perf_03_tiling_overhead_large_image(
    warm_engine, http_client, image_small, image_large
):
    t_small = time.perf_counter()
    r_small = http_client.post(
        "/detect",
        files={"file": ("small.jpg", image_small, "image/jpeg")},
        timeout=120,
    )
    small_ms = (time.perf_counter() - t_small) * 1000.0
    assert r_small.status_code == 200
    config = json.dumps(
        {"altitude": 400, "focal_length": 24, "sensor_width": 23.5}
    )
    t_large = time.perf_counter()
    r_large = http_client.post(
        "/detect",
        files={"file": ("large.jpg", image_large, "image/jpeg")},
        data={"config": config},
        timeout=120,
    )
    large_ms = (time.perf_counter() - t_large) * 1000.0
    assert r_large.status_code == 200
    assert large_ms < 120_000.0
    print(
        f"nft_perf_03_csv,baseline_small_ms,{small_ms:.2f},large_ms,{large_ms:.2f}"
    )
    assert large_ms > small_ms - 500.0