import datetime

def verify_real_wakeup_with_mock_api():
    # --- DATA FROM DATABASE (REAL) ---
    # session id 1 wakeup: 2026-05-27 03:17:00 UTC
    wakeup_utc = datetime.datetime(2026, 5, 27, 3, 17)
    wakeup_utc_mins = wakeup_utc.hour * 60 + wakeup_utc.minute
    
    # --- SETUP PARAMETERS (CLIENT SIDE) ---
    # User is in Stockholm (+2)
    offset_in_minutes = -120 
    local_ref_str = "04:00"
    local_ref_mins = 4 * 60

    print(f"1. Database Wakeup (UTC): {wakeup_utc} ({wakeup_utc_mins}m)")
    print(f"2. Client Local Reference: {local_ref_str} ({local_ref_mins}m)")
    print(f"3. Client Timezone Offset: {offset_in_minutes}m")

    # --- STEP 1: SIMULATE API CALL (CLIENT SIDE) ---
    def localHHMMToUTCHHMM(hhmm, offset):
        [h, m] = map(int, hhmm.split(":"))
        total_mins_utc = (h * 60 + m) + offset
        norm = ((total_mins_utc % 1440) + 1440) % 1440
        return f"{norm // 60:02d}:{norm % 60:02d}"

    utc_ref = localHHMMToUTCHHMM(local_ref_str, offset_in_minutes)
    print(f"4. Simulated API call with wakeup_ref (converted to UTC): {utc_ref}")

    # --- STEP 2: SIMULATE BACKEND (SERVER SIDE) ---
    # Backend receives utc_ref and calculates delta: wakeup_utc - utc_ref
    utc_ref_mins = (int(utc_ref.split(":")[0]) * 60 + int(utc_ref.split(":")[1]))
    backend_delta = wakeup_utc_mins - utc_ref_mins
    print(f"5. Backend returns delta: {backend_delta}")

    # --- STEP 3: SIMULATE COMPONENT RENDERING (CLIENT SIDE) ---
    # Component receives delta and uses it directly as offsetFromRef.
    offset_from_ref = backend_delta
    
    def formatMinutesAfter(minutes, ref):
        [rh, rm] = map(int, ref.split(":"))
        target = (rh * 60 + rm) + minutes
        norm = ((target % 1440) + 1440) % 1440
        return f"{norm // 60:02d}:{norm % 60:02d}"

    displayed_time = formatMinutesAfter(offset_from_ref, local_ref_str)
    print(f"6. Component renders time: {displayed_time}")

    # --- ASSERTION ---
    expected_local_time = "05:17"
    print(f"\nASSERTION: Expected {expected_local_time}, Actual {displayed_time}")
    if displayed_time == expected_local_time:
        print("VERIFICATION SUCCESSFUL!")
    else:
        print("VERIFICATION FAILED!")
        exit(1)

if __name__ == "__main__":
    verify_real_wakeup_with_mock_api()