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src/utils/flight_plan_helpers.py

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+from datetime import datetime, timedelta
+from fastapi import BackgroundTasks
+from background_jobs.weather import download_weather_for_plan_marker
+from database import models
+from utils.gps import get_distance
+
+
+async def refresh_markers_weather_info(
+    planned_takeoff_datetime: datetime, planned_speed: float,
+    markers: list[models.FlightPlanMarker], background_tasks: BackgroundTasks
+):
+    if not planned_takeoff_datetime:
+        return
+
+    marker_date_time = planned_takeoff_datetime
+    previous_marker = markers[0] if markers else None
+    for marker in markers:
+        if marker_date_time:
+            # TODO: tohle by se melo volat i v pripade zmeny planovaneho casu vzletu i planovane rychlosti
+            distance_from_prev = get_distance(
+                a=(previous_marker.gps_latitude, previous_marker.gps_longitude),
+                b=(marker.gps_latitude, marker.gps_longitude)
+            )
+            time_from_prev_sec = distance_from_prev / planned_speed * 3600  # pracuji v km/h
+            marker_date_time = marker_date_time + timedelta(seconds=time_from_prev_sec)
+
+            background_tasks.add_task(
+                download_weather_for_plan_marker,
+                marker_id=marker.id, date_time=marker_date_time
+            )
+        previous_marker = marker