#!/usr/bin/env python3
"""Regression checks for Meteo7 interpretation (weathercode mode, ice gates, hours, trend max/min)."""
import sys
from pathlib import Path

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

from previsione7 import (
    _merge_weathercode,
    _format_event_hours,
    analyze_daily_events,
    analyze_temperature_trend,
    format_detailed_trend_explanation,
    get_precip_type,
)


def test_weathercode_mode_not_median():
    # 61 (rain) + 71 (snow) → mediana numerica sarebbe 66 (FZRA); moda deve evitare 66
    assert _merge_weathercode([61, 71], preferred=61) == 61
    assert _merge_weathercode([61, 71], preferred=71) == 71
    assert _merge_weathercode([61, 61, 71]) == 61
    assert _merge_weathercode([66, 66, 61]) == 66
    print("OK weathercode mode")


def test_get_precip_type_temp_gate():
    assert "Congelantesi" not in get_precip_type(67, temp=28.0)
    assert "Pioggia" in get_precip_type(67, temp=28.0)
    assert "Congelantesi" in get_precip_type(67, temp=0.5)
    assert "Neve" not in get_precip_type(71, temp=20.0)
    assert "Neve" in get_precip_type(71, temp=-1.0)
    print("OK precip type temp gate")


def test_gelicidio_hot_air_no_event():
    times = [f"2026-07-21T{h:02d}:00" for h in range(24)]
    codes = [0] * 24
    codes[20] = 67  # FZRA spurio
    precip = [0.0] * 24
    precip[20] = 1.2
    temps = [28.0] * 24
    dewpoints = [18.0] * 24
    winds = [5.0] * 24
    events = analyze_daily_events(
        times, codes, None, precip, winds, temps, dewpoints,
        snowfalls=[0.0] * 24, rains=precip[:], soil_temps=[25.0] * 24,
        cloud_covers=[50.0] * 24, wind_speeds=winds,
    )
    ice_like = [e for e in events if "GELICIDIO" in e or "BRINA" in e or "Gelata" in e or "Black Ice" in e]
    assert not ice_like, f"unexpected ice events in heat: {ice_like}"
    rain_like = [e for e in events if "Pioggia" in e or "Congelantesi" in e]
    assert rain_like, "expected rain event"
    assert all("Congelantesi" not in e for e in rain_like)
    print("OK no gelicidio at 28°C")


def test_single_hour_event_range():
    times = [f"2026-07-21T{h:02d}:00" for h in range(24)]
    assert _format_event_hours(times, 20, 20) == "20:00-21:00"
    assert _format_event_hours(times, 20, 21) == "20:00-22:00"
    # last hour of day
    assert _format_event_hours(times, 23, 23) == "23:00-00:00"

    codes = [0] * 24
    precip = [0.0] * 24
    precip[20] = 2.0
    temps = [22.0] * 24
    events = analyze_daily_events(
        times, codes, None, precip, [5.0] * 24, temps, [12.0] * 24,
        snowfalls=[0.0] * 24, rains=precip[:],
    )
    rain_ev = [e for e in events if "🕒" in e]
    assert rain_ev, events
    assert "20:00-21:00" in rain_ev[0]
    assert "20:00-20:00" not in rain_ev[0]
    print("OK single-hour 20:00-21:00")


def test_trend_max_min_not_media():
    # Heatwave: max stay high, slight drop → calo_termico not fronte_freddo
    tmax = [34, 35, 36, 33, 30, 29, 28, 27, 26, 25]
    tmin = [22, 23, 24, 21, 20, 19, 18, 17, 16, 15]
    trend = analyze_temperature_trend(tmax, tmin, days=10)
    assert trend is not None
    assert "first_max" in trend and "first_min" in trend
    assert trend["type"] == "calo_termico"
    text = format_detailed_trend_explanation(trend, daily_time_list=[f"2026-07-{21+i:02d}" for i in range(10)])
    assert "media" not in text.lower()
    assert "Massime:" in text and "Minime:" in text
    assert "Fronte Freddo" not in text
    print("OK trend max/min calo_termico")


def test_real_gelicidio_cold():
    times = [f"2026-01-10T{h:02d}:00" for h in range(24)]
    codes = [0] * 24
    codes[8] = 67
    precip = [0.0] * 24
    precip[8] = 0.5
    temps = [5.0] * 24
    temps[8] = -0.5
    events = analyze_daily_events(
        times, codes, None, precip, [3.0] * 24, temps, [-1.0] * 24,
        snowfalls=[0.0] * 24, rains=precip[:], soil_temps=[-1.0] * 24,
        cloud_covers=[80.0] * 24, wind_speeds=[3.0] * 24,
    )
    assert any("GELICIDIO" in e for e in events), events
    print("OK real gelicidio at subzero")


if __name__ == "__main__":
    test_weathercode_mode_not_median()
    test_get_precip_type_temp_gate()
    test_gelicidio_hot_air_no_event()
    test_single_hour_event_range()
    test_trend_max_min_not_media()
    test_real_gelicidio_cold()
    print("\nAll interpretation regression checks passed.")