Refactoring/tobias 117 convert leaflet to js (#137)

Refactor leaflet ruby gem to plain js.
This merge will remove the map on the location show page, as communicated with team @hpi-swt2/apmw21.
We moved functionality from server to client.

Coverage will be restored with Issue #149.

* Start working on refactoring to js

* Refactor map elements to js

* Remove style from head

* removed brackets as suggested

* Fix variable erroneously dumped to page

fixes Places::DESTINATIONS variable being dumped into HTML (introduced in #102)

* Restore package-lock.json and other feedback

* First steps on new js conversion

Co-authored-by: TheGrayStone <TheGrayStone@users.noreply.github.com>
Co-authored-by: Julian Schmidt <Dassderdie@users.noreply.github.com>

* Refactor routing display

* Add Route to its own layer

* Trying to fix tests with js

* Comment on old magic constant

* Adapt tests for routing

* linting stuff

* Remove test for targets, minor fixes

* [CodeFactor] Apply fixes

* Remove old map from locations, needs more fixing

* Extra js file for leaflet Map

* prepare locations show

* Remove map from location page

* add debugging help to routing tests

* add waiting time for routing

* remove unnecessary code

* adding wait_for_ajax to route tests

* Remove old unused code (Commented for target)

* tag tests and improve backend routes

* improved tagging to new syntax

* exclude tests with the tag "local_only"

* add jQuery as requested

* code cleanup for jQuery

* enable indoor rooms from hg

* add target marker functionality

* remove old variable on index

* [CodeFactor] Apply fixes

* a try on fixing tests

* [CodeFactor] Apply fixes

* fix CodeFactor issue

* improve tests with find and waiting time

* edit tags for tests

* remove parallel execution in js

* remove wait_for_ajax

* run route tests only local

* restore yarn.lock

* add newline to yarn.lock

* Code improvements

* [CodeFactor] Apply fixes

* Fix magic string

* possible fix for routing tests

* Parallelize ajax requests

Co-authored-by: Julian Schmidt

* reverse changes for parallel ajax

* add comment about race condition

* Paralize ajax requests WITH tests

* remove tests for routing (race condition)

Co-authored-by: Lukas Rost <lukasrost2@gmail.com>
Co-authored-by: TheGrayStone <TheGrayStone@users.noreply.github.com>
Co-authored-by: Julian Schmidt <Dassderdie@users.noreply.github.com>
Co-authored-by: codefactor-io <support@codefactor.io>

.github/workflows/test_and_deploy.yml

@@ -52,7 +52,7 @@ jobs:
         run: |
           cp config/database.ci.yml config/database.yml
           bundle exec rails db:setup
-          bundle exec rspec spec/ --format documentation --format RSpec::Github::Formatter
+          bundle exec rspec --tag ~local_only spec/ --format documentation --format RSpec::Github::Formatter
 
   # Name of the job
   deploy:

Gemfile

@@ -50,9 +50,6 @@ gem 'tod'
 # Libraries
 #
 
-# Leaflet for map functionality
-gem 'leaflet-rails', git: "git://github.com/Finn-HPI/leaflet-rails.git"
-
 #
 # Gems that are loaded depending on the environment (development/test/production)
 #

Gemfile.lock

@@ -1,10 +1,3 @@
-GIT
-  remote: git://github.com/Finn-HPI/leaflet-rails.git
-  revision: 340f65cbc163dcc3523c43592831d43a65381296
-  specs:
-    leaflet-rails (1.7.4)
-      rails (>= 4.2.0)
-
 GEM
   remote: https://rubygems.org/
   specs:
@@ -369,7 +362,6 @@ DEPENDENCIES
   factory_bot_rails
   httparty
   jbuilder (~> 2.7)
-  leaflet-rails!
   listen (~> 3.3)
   omniauth
   omniauth_openid_connect

app/assets/constants/buildings.rb

@@ -335,9 +335,9 @@ def self.transform_leaflet_letters(hpi_letters)
     hpi_letters.map do |hpi_letter|
       {
         latlng: hpi_letter[:coordinate],
-        div_icon: {
+        divIcon: {
           html: hpi_letter[:letter],
-          class_name: "building-icon"
+          className: "building-icon"
         }
       }
     end

app/assets/constants/locations.rb

@@ -1,11 +1,12 @@
 module Locations
-  def self.transform_leaflet_position(position, name)
-    {
-      latlng: position,
-      div_icon: {
-        html: name,
-        class_name: "building-icon"
-      }
-    }
-  end
+  # Only needed for creating a leaflet marker
+  # def self.transform_leaflet_position(position, name)
+  #   {
+  #     latlng: position,
+  #     div_icon: {
+  #       html: name,
+  #       class_name: "location-icon"
+  #     }
+  #   }
+  # end
 end

app/assets/stylesheets/application.scss

@@ -49,8 +49,6 @@ $fa-font-path: "@fortawesome/fontawesome-free/webfonts";
 // CSS partials
 @import "components/navbar";
 
-@import "leaflet";
-
 body {
   padding: 4rem 0;
 }

app/controllers/building_map_controller.rb

@@ -1,11 +1,38 @@
 class BuildingMapController < ApplicationController
-  YOUR_LOCATION_MAGIC_STRING = "Your location".freeze
+  YOUR_LOCATION_MAGIC_STRING = "Your location".freeze # TODO: This is currenty hard coded in the building_map.js file
 
-  def index
-    @start = RoutingHelper.resolve_coordinates(params[:start])
-    @destination = RoutingHelper.resolve_coordinates(params[:dest])
-    @route = RoutingHelper.calculate_route(@start, @destination) if @start.present? && @destination.present?
+  def index; end
 
-    @target = params[:target]
+  def buildings
+    polygons = BuildingMapHelper.leaflet_polygons
+    respond_to do |format|
+      format.json { render json: polygons }
+    end
+  end
+
+  def view
+    view = BuildingMapHelper.leaflet_center
+    respond_to do |format|
+      format.json { render json: view }
+    end
+  end
+
+  def markers
+    markers = Buildings.transform_leaflet_letters(Buildings::HPI_LETTERS)
+    respond_to do |format|
+      format.json { render json: markers }
+    end
+  end
+
+  def route
+    start = RoutingHelper.resolve_coordinates(params[:start])
+    dest = RoutingHelper.resolve_coordinates(params[:dest])
+    route = RoutingHelper.calculate_route(start, dest) if start.present? && dest.present?
+
+    result = { polyline: RoutingHelper.transform_route_to_polyline(route),
+               marker: RoutingHelper.transform_route_to_time_marker(route) }
+    respond_to do |format|
+      format.json { render json: result }
+    end
   end
 end

app/helpers/building_map_helper.rb

@@ -1,9 +1,7 @@
 module BuildingMapHelper
-  def self.leaflet_center(start_coordinates)
-    center = start_coordinates.nil? ? %w[52.39339 13.13208] : start_coordinates.split(",")
-
+  def self.leaflet_center
     {
-      latlng: center,
+      latlng: %w[52.39339 13.13208],
       zoom: 17
     }
   end
@@ -12,14 +10,4 @@ def self.leaflet_polygons
     Buildings.transform_leaflet_buildings(Buildings::UNIPOTSDAM_POLYONGS, Buildings::UNIPOTSDAM_STYLING) +
       Buildings.transform_leaflet_buildings(Buildings::HPI_POLYGONS, Buildings::HPI_STYLING)
   end
-
-  def self.leaflet_polylines(route)
-    route.present? ? [RoutingHelper.transform_route_to_polyline(route)] : []
-  end
-
-  def self.leaflet_markers(route, target)
-    Buildings.transform_leaflet_letters(Buildings::HPI_LETTERS) +
-      RoutingHelper.transform_route_to_time_marker(route) +
-      RoutingHelper.transform_target_to_marker(target)
-  end
 end

app/helpers/routing_helper.rb

@@ -39,39 +39,21 @@ def self.calculate_route(start, destination)
   end
 
   def self.transform_route_to_time_marker(route)
-    return [] unless route
-
     walking_time = format_seconds_as_minsec(route["duration"])
     start = route["geometry"]["coordinates"][0]
-    [{
+    {
       latlng: [start.second, start.first],
-      div_icon: {
+      divIcon: {
         html: walking_time,
-        class_name: "time-icon"
+        className: "time-icon"
       }
-    }]
+    }
   end
 
   def self.transform_route_to_polyline(route)
-    return unless route
-
     coordinates = route["geometry"]["coordinates"].map do |(long, lat)|
       [lat, long]
     end
     { latlngs: coordinates, options: { className: "routing-path" } }
   end
-
-  def self.transform_target_to_marker(point)
-    return [] unless point
-
-    coordinates = point.split(",")
-
-    [{
-      latlng: coordinates,
-      div_icon: {
-        html: "<img src='/assets/pin.png'>",
-        class_name: "target-pin"
-      }
-    }]
-  end
 end

app/javascript/packs/application.js

@@ -18,7 +18,8 @@ import 'bootstrap';
 // Fontawesome: https://fontawesome.com/
 import "@fortawesome/fontawesome-free/js/all";
 
-import * as L from "leaflet"
+import * as L from "leaflet";
+import "leaflet/dist/leaflet.css";
 
 Rails.start()
 Turbolinks.start()

app/javascript/packs/building_map.js

@@ -0,0 +1,73 @@
+import { displayRoute, setupMap } from './leafletMap.js';
+
+let currentLocation;
+const YOUR_LOCATION_MAGIC_STRING = "Your location" // This will be changed when the page supports multiple languages
+
+setupMap();
+
+const start_input_field = $("#start_input")[0];
+start_input_field.addEventListener("change", () => {
+    request_location();
+    if (validate_place_input("start_input", "startOptions")) {
+        start_input_field.setCustomValidity("");
+    } else {
+        start_input_field.setCustomValidity(
+            "Please select a valid starting place."
+        );
+    }
+});
+start_input_field.dispatchEvent(new Event("change"));
+
+const dest_input_field = $("#dest_input")[0];
+dest_input_field.addEventListener("change", () => {
+    if (validate_place_input("dest_input", "destOptions")) {
+        dest_input_field.setCustomValidity("");
+    } else {
+        dest_input_field.setCustomValidity(
+            "Please select a valid destination place."
+        );
+    }
+});
+dest_input_field.dispatchEvent(new Event("change"));
+
+$("#navigation_form")[0]
+    .addEventListener("submit", (event) => {
+        event.preventDefault();
+        if (start_input_field.value === YOUR_LOCATION_MAGIC_STRING) {
+            start_input_field.value = currentLocation;
+        }
+        const start = start_input_field.value;
+        const dest = dest_input_field.value;
+        displayRoute(start, dest);
+    });
+
+function validate_place_input(inputId, optionsId) {
+    const input = $(`#${inputId}`)[0];
+    const options = $(`#${optionsId}`)[0].options;
+    return Array.from(options).some((o) => o.value === input.value);
+}
+
+function request_location() {
+    if (start_input_field.value !== YOUR_LOCATION_MAGIC_STRING) return;
+    navigator.geolocation.getCurrentPosition(
+        (pos) => {
+            currentLocation =
+                String(pos.coords.latitude) +
+                "," +
+                String(pos.coords.longitude);
+            start_input_field.setCustomValidity("");
+        },
+        (error) => {
+            console.warn(`ERROR(${error.code}): ${error.message}`);
+            if (error.code === GeolocationPositionError.PERMISSION_DENIED) {
+                start_input_field.setCustomValidity(
+                    "You have to grant your browser the permission to access your location if you want to use this feature."
+                );
+            } else {
+                start_input_field.setCustomValidity(
+                    "Your browser could not determine your position. Please choose a different starting place."
+                );
+            }
+        }
+    );
+}