"""Pure production-calendar classification shared by API and tests."""

from datetime import date

from app.merakomis_schema import DAY_TYPE_NO_WORK

PER_HOUR_DEFAULT = 8


def get_work_hours_in_date(day: date) -> float:
    if day.weekday() < 5:
        return float(PER_HOUR_DEFAULT)
    return 0.0


def format_day_context(row: dict | None, day: date) -> dict:
    """Return the complete calendar contract for one date."""
    row = row or {}
    day_type = int(row.get("type") or 0)
    source_text = (row.get("text") or "").strip()
    explicit_hours = row.get("hours")
    normal_hours = (
        float(explicit_hours)
        if explicit_hours is not None
        else get_work_hours_in_date(day)
    )
    is_non_working = day_type == DAY_TYPE_NO_WORK or day.weekday() >= 5
    if is_non_working:
        normal_hours = 0.0

    if source_text:
        explanation = source_text
    elif is_non_working:
        explanation = "Выходной или нерабочий день"
    elif normal_hours < PER_HOUR_DEFAULT:
        explanation = "Сокращённый рабочий день"
    else:
        explanation = "Рабочий день"

    return {
        "date": day.isoformat(),
        "type": day_type,
        "text": source_text,
        "normal_hours": normal_hours,
        "is_non_working": is_non_working,
        "source_explanation": explanation,
    }