from datetime import date, timedelta

from dashboard_data.card_utils import PERSIAN_WEEKDAYS, safe_number


def build_sensor_comparison_chart(sensor_id: str, context: dict | None = None, ai_bundle: dict | None = None) -> dict:
    history = (context or {}).get("history", [])
    current_sensor = (context or {}).get("sensor")
    current_value = round(safe_number(getattr(current_sensor, "soil_moisture", None), 0))

    recent = list(reversed(history[:7]))
    previous = list(reversed(history[7:14]))
    this_week = [round(safe_number(item.soil_moisture, current_value)) for item in recent]
    last_week = [round(safe_number(item.soil_moisture, current_value - 5)) for item in previous]

    while len(this_week) < 7:
        this_week.append(current_value)
    while len(last_week) < 7:
        last_week.append(max(0, current_value - 5))

    categories = [PERSIAN_WEEKDAYS[(date.today() - timedelta(days=offset)).weekday()] for offset in range(6, -1, -1)]
    avg_this = sum(this_week) / len(this_week)
    avg_last = sum(last_week) / len(last_week)
    delta = round(((avg_this - avg_last) / avg_last) * 100) if avg_last else 0

    return {
        "currentValue": current_value,
        "vsLastWeek": f"{'+' if delta >= 0 else ''}{delta}%",
        "vsLastWeekValue": delta,
        "categories": categories,
        "series": [
            {"name": "امروز", "data": this_week},
            {"name": "هفته قبل", "data": last_week},
        ],
    }