from typing import Literal, TypedDict, List

DayPattern = Literal[
    "daily",
    "weekdays",
    "weekend",
    "mon_wed_fri",
    "tue_thu",
    "mon_thu",
    "sat",
    "sun",
    "monthly",
]

class Routine(TypedDict):
    routine_id: str
    days: str
    time_local: str  # HH:MM


class RoutineDecision(TypedDict):
    routine_id: str
    should_run: bool
    reason: str


def _matches_day(pattern: str, weekday: int) -> bool:
    """weekday: 0=Monday ... 6=Sunday"""
    p = pattern.lower()
    if p == "daily":
        return True
    if p == "weekdays":
        return weekday < 5
    if p == "weekend":
        return weekday >= 5
    if p == "sat":
        return weekday == 5
    if p == "sun":
        return weekday == 6
    if p == "mon_wed_fri":
        return weekday in (0, 2, 4)
    if p == "tue_thu":
        return weekday in (1, 3)
    if p == "mon_thu":
        return weekday in (0, 3)
    if p == "monthly":
        return False  # handled elsewhere or by calendar
    return False


def decide_routines_to_run(routines: List[Routine], weekday: int, current_time: str) -> List[RoutineDecision]:
    """Decide which routines should run at a given weekday/time.

    - weekday: 0=Monday ... 6=Sunday
    - current_time: 'HH:MM' string
    """
    decisions: List[RoutineDecision] = []
    for r in routines:
        rid = r["routine_id"]
        days = r.get("days", "daily")
        time_local = r.get("time_local", "00:00")

        if not _matches_day(days, weekday):
            decisions.append(
                {
                    "routine_id": rid,
                    "should_run": False,
                    "reason": f"Pattern '{days}' does not match this weekday.",
                }
            )
            continue

        if time_local == current_time:
            decisions.append(
                {
                    "routine_id": rid,
                    "should_run": True,
                    "reason": "Time and day pattern match current moment.",
                }
            )
        else:
            decisions.append(
                {
                    "routine_id": rid,
                    "should_run": False,
                    "reason": f"Current time {current_time} != routine time {time_local}.",
                }
            )
    return decisions


if __name__ == "__main__":
    sample = [
        {"routine_id": "RT_MORNING_LR", "days": "daily", "time_local": "07:15"},
        {"routine_id": "RT_LAUNDRY_REMIND", "days": "sat", "time_local": "10:00"},
    ]
    # Example: Saturday at 07:15 -> weekday=5
    for d in decide_routines_to_run(sample, weekday=5, current_time="07:15"):
        print(d)