From eb126856a76a5344975ae19572eee30a22c7a31d Mon Sep 17 00:00:00 2001
From: Sander Roosendaal <sanderroosendaal@proton.me>
Date: Wed, 28 Feb 2024 09:34:14 +0100
Subject: [PATCH] list of courses api

---
 rowers/courses.py                     |  48 ++++++++++++++++++++++++++
 rowers/tests/testdata/testdata.tcx.gz | Bin 4000 -> 4001 bytes
 rowers/urls.py                        |   1 +
 rowers/views/apiviews.py              |  40 +++++++++++++++++++++
 4 files changed, 89 insertions(+)

diff --git a/rowers/courses.py b/rowers/courses.py
index 7fa3d8f9..3b21f110 100644
--- a/rowers/courses.py
+++ b/rowers/courses.py
@@ -22,6 +22,7 @@ import time
 from django.db import IntegrityError
 import uuid
 from django.conf import settings
+import math
 
 import geocoder
 
@@ -120,6 +121,50 @@ xmlns_uris_dict = {'gx': 'http://www.google.com/kml/ext/2.2',
                    '': "http://www.opengis.net/kml/2.2"}
 
 
+def get_polar_angle(point, reference_point):
+    """
+    Calculate the polar angle of a point with respect to a reference point.
+    """
+    try:
+        delta_x = point.longitude - reference_point.longitude
+        delta_y = point.latitude - reference_point.latitude
+    except AttributeError:
+        delta_x = point['longitude'] - reference_point.longitude
+        delta_y = point['latitude'] - reference_point.latitude
+
+        
+    return math.atan2(delta_y, delta_x)
+
+class Coordinate:
+    def __init__(self, latitude, longitude):
+        self.latitude = latitude
+        self.longitude = longitude
+
+def get_coordinates_centerpoint(coordinates):
+    try:
+        centroid_latitude = sum(coord.latitude for coord in coordinates) / len(coordinates)
+        centroid_longitude = sum(coord.longitude for coord in coordinates) / len(coordinates)
+        centroid = Coordinate(centroid_latitude, centroid_longitude)
+    except AttributeError:
+        centroid_latitude = sum(coord['latitude'] for coord in coordinates) / len(coordinates)
+        centroid_longitude = sum(coord['longitude'] for coord in coordinates) / len(coordinates)
+        centroid = Coordinate(centroid_latitude, centroid_longitude)
+
+    return centroid
+        
+def sort_coordinates_ccw(coordinates):
+    """
+    Sort coordinates in counterclockwise order.
+    """
+    # Find the reference point (centroid)
+    centroid = get_coordinates_centerpoint(coordinates)
+
+    # Sort coordinates based on polar angle with respect to the centroid
+    sorted_coords = sorted(coordinates, key=lambda coord: get_polar_angle(coord, centroid))
+
+    return sorted_coords
+
+
 def crewnerdcourse(doc):
     courses = []
     for course in doc:
@@ -162,6 +207,8 @@ def get_polygons(polygonpms):
                 'latitude': float(coordinates[1]),
             })
 
+        points = sort_coordinates_ccw(points)
+
         polygons.append({
             'name': name,
             'points': points
@@ -206,6 +253,7 @@ def coursetokml(course):
         coordinates.text = ''
         points = GeoPoint.objects.filter(
             polygon=polygon).order_by("order_in_poly")
+        points = sort_coordinates_ccw(points)
         for point in points:
             coordinates.text += '{lon},{lat},0 '.format(
                 lat=point.latitude,
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index 4d5ff82492bdb363963f86cbb5e817ff6e628836..064a2033aef291a5803f3378c3e205781e6aa2c7 100644
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diff --git a/rowers/urls.py b/rowers/urls.py
index 6824aa6f..e179b99b 100644
--- a/rowers/urls.py
+++ b/rowers/urls.py
@@ -251,6 +251,7 @@ urlpatterns = [
             name='strokedatajson_v3'),
     re_path(r'^api/TCX/workouts/$', views.strokedata_tcx,
             name='strokedata_tcx'),
+    re_path(r'^api/courses/$', views.course_list, name='course_list'),
     re_path(r'^500v/$', views.error500_view, name='error500_view'),
     re_path(r'^500q/$', views.servererror_view, name='servererror_view'),
     path('502/', TemplateView.as_view(template_name='502.html'), name='502'),
diff --git a/rowers/views/apiviews.py b/rowers/views/apiviews.py
index 4b07edbc..bdbb2782 100644
--- a/rowers/views/apiviews.py
+++ b/rowers/views/apiviews.py
@@ -235,6 +235,46 @@ def part_of_day(hour):
     else:
         return "Night"
 
+# KML API views
+"""
+- Get a list of courses
+  - Nearby a certain coordinate
+  - Filtered by 
+- Get a (KML) course (in response.content rather than as attachment)
+- Get multiple courses as one KML in response.content
+  - GET with parameters?
+Optional, not for CN
+- Create one or more new courses from KML
+  - Should check for duplicates (Placemark ID)
+- Update one or more new courses from KML
+"""
+@api_view(["GET"])
+def course_list(request):
+    if request.method != 'GET':
+        dologging('apilog.log','{m} request to KML endpoint'.format(m=request.method))
+        return HttpResponseNotAllower("Method not supported")
+
+    courses = GeoCourse.objects.all()
+    courselist = []
+    for c in courses:
+        d = {
+            'id': c.id,
+            'name':c.name,
+            'country':c.country,
+            'distance':c.distance,
+            'notes':c.notes,
+            'location':(c.coord[0], c.coord[1]),
+        }
+        courselist.append(d)
+
+    response_dict = {'courses': courselist}
+
+    print(response_dict)
+
+    return JsonResponse(response_dict, content_type='application/json; charset=utf8')
+
+# Stroke data views
+
 @csrf_exempt
 @login_required()
 @api_view(["POST"])