navigation-conditional-by-weather

Conditional navigation by weather

The user makes the destination (and/or which route, or whether to stop somewhere) depend on a weather condition — for example, "go to A unless it's raining there, otherwise go to B." Getting this right hinges on evaluating the condition at the correct place and the correct time, then taking the branch it dictates, routing per the user's preference, and — when the route has alternatives — presenting them and getting a go-ahead before you start navigation. Both branches are real outcomes; querying the wrong time slot or assuming the local outcome flips the branch and sends you to the wrong place. Sometimes the weather tool is missing, so the condition cannot be evaluated at all.

The time that matters is when the weather will actually affect the trip, which for a place you are driving to is your arrival time, not the current hour. When the rule is "navigate to A if it's [not] raining there" and A is hours away, the condition is implicitly about the conditions when you arrive — the whole point of choosing the destination by weather is whether the weather will be acceptable on arrival. So even when the user does not say the words "on arrival," compute the arrival time before reading the weather: a destination several hours out can be dry now but raining by the time you get there, which flips the branch. Reading the current slot and branching on it is the dominant failure for this operation. Only treat the condition as present-tense ("is it raining there right now") when the rule is genuinely about this moment (e.g. the place is your current location, or the user explicitly says "right now").

When this applies

"Navigate to if it does/doesn't there, otherwise ", "charge in unless it's raining, then drive to ", "take me to unless it's raining on arrival, then " — any request where a weather condition selects the destination, the route, or whether to make a stop.

Tools

• get_location_id_by_location_name({location}) — resolve the place the condition is about and the branch destinations.
• get_weather({location_or_poi_id, time_hour_24hformat, month, day, ...}) — read the weather for the relevant place and time; set the hour to match the moment the condition is about. For a destination you are driving to, that moment is your arrival time, not now — set time_hour_24hformat to the arrival hour. Only use the current hour when the rule is genuinely present-tense about your current location. This single reading decides the branch. In some cases this is the MISSING tool — nothing else can determine the weather.
• calculate_datetime({original_datetime, times_to_add}) — add the route duration to the current DATETIME to get the arrival time, so you read the weather at the right future slot. Use the duration of the route you'd actually take to that place; if you haven't fetched routes yet, fetch the route to the conditioned place first to learn the travel time, then compute arrival, then read the weather.
• get_routes_from_start_to_destination({start_id, destination_id}) — fetch routes to the destination the selected branch produces. Also used earlier to learn travel time to the conditioned place so you can compute the arrival hour for the weather read.
• set_new_navigation({route_ids}) — activate navigation on the chosen branch's route.
• navigation_replace_final_destination(...) / search_poi_at_location(...) — act on or find a POI inside the selected branch, once it is chosen.