from datetime import datetime
from types import SimpleNamespace

from app.routers.reviews import _apply_device_corrections
from app.routers.reviews import _effective_review_time
from app.schemas import ApproveReportRequest, ReportDeviceCorrection
from app.services.serializers import _datetime_changed


def _device(id_: int, name: str, scanned_at: datetime, sort_order: int):
    return SimpleNamespace(
        id=id_,
        device_no=name,
        process_name="1",
        scanned_at=scanned_at,
        sort_order=sort_order,
    )


def _report(devices):
    return SimpleNamespace(session=SimpleNamespace(devices=devices))


def test_first_device_correction_syncs_report_start_time():
    first_scan = datetime(2026, 5, 27, 8, 0)
    next_start = datetime(2026, 5, 27, 8, 0)
    next_end = datetime(2026, 5, 27, 10, 0)
    first = _device(1, "A", first_scan, 0)
    second = _device(2, "B", datetime(2026, 5, 27, 9, 30), 1)
    payload = ApproveReportRequest(
        device_corrections=[
            ReportDeviceCorrection(id=1, scanned_at=datetime(2026, 5, 27, 8, 30))
        ]
    )

    changed, corrected_start = _apply_device_corrections(None, _report([first, second]), payload, next_start, next_end)

    assert changed is True
    assert corrected_start == datetime(2026, 5, 27, 8, 30)
    assert first.scanned_at == corrected_start


def test_top_start_time_syncs_first_device_when_device_corrections_are_empty():
    first = _device(1, "A", datetime(2026, 5, 27, 13, 56, 11), 0)
    payload = ApproveReportRequest()

    changed, corrected_start = _apply_device_corrections(
        None,
        _report([first]),
        payload,
        datetime(2026, 5, 27, 10, 0),
        datetime(2026, 5, 27, 13, 59),
    )

    assert changed is True
    assert corrected_start == datetime(2026, 5, 27, 10, 0)
    assert first.scanned_at == corrected_start


def test_non_first_device_correction_does_not_change_report_start_time():
    first = _device(1, "A", datetime(2026, 5, 27, 8, 0), 0)
    second = _device(2, "B", datetime(2026, 5, 27, 9, 0), 1)
    payload = ApproveReportRequest(
        device_corrections=[
            ReportDeviceCorrection(id=2, scanned_at=datetime(2026, 5, 27, 9, 30))
        ]
    )

    changed, corrected_start = _apply_device_corrections(
        None,
        _report([first, second]),
        payload,
        datetime(2026, 5, 27, 8, 0),
        datetime(2026, 5, 27, 10, 0),
    )

    assert changed is True
    assert corrected_start == datetime(2026, 5, 27, 8, 0)
    assert first.scanned_at == datetime(2026, 5, 27, 8, 0)
    assert second.scanned_at == datetime(2026, 5, 27, 9, 30)


def test_same_minute_picker_value_keeps_original_seconds():
    current = datetime(2026, 5, 29, 15, 10, 6)
    payload = datetime(2026, 5, 29, 15, 10, 0)

    assert _effective_review_time(payload, current) == current
    assert _datetime_changed(current.isoformat(), payload.isoformat()) is False


def test_adjacent_minute_picker_value_is_real_correction():
    current = datetime(2026, 5, 29, 15, 10, 6)
    payload = datetime(2026, 5, 29, 15, 11, 0)

    assert _effective_review_time(payload, current) == payload
    assert _datetime_changed(current.isoformat(), payload.isoformat()) is True