"""Event timestamp decode — waveform trigger/stop vs histogram window start.

The Blastware footer holds two timestamps: ts1 = footer[2:10], ts2 = footer[10:18].
Their meaning depends on record type:

  * Waveform: ts1 is the monitoring-SESSION start (e.g. 06:00 for a unit that
    arms at 06:00 daily — shared across every event that day), and ts2 is THIS
    event's recording STOP.  read_blastware_file used to stamp events with ts1 →
    every waveform showed the session start (~4.5 h off).  Binary-only, the best
    estimate is ts2 (the stop); the exact trigger BW displays (= ts2 - record
    duration) comes from the paired report's event_datetime, since the binary
    STRT record-time byte is a misparsed record-type marker.
  * Histogram: ts1/ts2 are the ~24 h window [start, stop]; the event time is the
    window start = ts1 (unchanged).
"""
import datetime
from pathlib import Path

from minimateplus.event_file_io import read_blastware_file, apply_report_to_event
from minimateplus.bw_ascii_report import BwAsciiReport
from minimateplus.models import Event

FIX = Path(__file__).parent / "fixtures"
WAVEFORM = FIX / "fft-oracle-2026-09-14" / "N844LQHB.ZT0W"   # footer ts2 = 2026-08-25 10:33:32
HISTOGRAM = FIX / "ts-fix" / "K441LKZU.C30H"                 # window start 2026-05-10 19:04:50


def _tuple(ts):
    return (ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second)


def test_waveform_timestamp_is_event_stop_not_session_start():
    ev = read_blastware_file(WAVEFORM)
    # ts2 (the event's recording stop), NOT the 06:00:13 monitoring-session
    # start the old decode used.
    assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 32), _tuple(ev.timestamp)


def test_histogram_timestamp_is_window_start_unchanged():
    ev = read_blastware_file(HISTOGRAM)
    # Histogram event time = the window start (ts1); must NOT get the waveform
    # ts2 treatment (that would land ~24 h off).
    assert _tuple(ev.timestamp) == (2026, 5, 10, 19, 4, 50), _tuple(ev.timestamp)


def test_report_event_datetime_overrides_to_exact_trigger():
    # A paired BW report carries the exact trigger time; applying it must
    # override the binary footer's stop time so the event matches BW exactly.
    ev = read_blastware_file(WAVEFORM)
    assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 32)   # stop, pre-report
    apply_report_to_event(ev, BwAsciiReport(
        event_datetime=datetime.datetime(2026, 8, 25, 10, 33, 29)))
    assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 29)   # exact BW trigger