Refactor error handling and requests

package-lock.json

@@ -1078,6 +1078,14 @@
       "resolved": "https://registry.npmjs.org/@csstools/normalize.css/-/normalize.css-10.1.0.tgz",
       "integrity": "sha512-ij4wRiunFfaJxjB0BdrYHIH8FxBJpOwNPhhAcunlmPdXudL1WQV1qoP9un6JsEBAgQH+7UXyyjh0g7jTxXK6tg=="
     },
+    "@egjs/hammerjs": {
+      "version": "2.0.17",
+      "resolved": "https://registry.npmjs.org/@egjs/hammerjs/-/hammerjs-2.0.17.tgz",
+      "integrity": "sha512-XQsZgjm2EcVUiZQf11UBJQfmZeEmOW8DpI1gsFeln6w0ae0ii4dMQEQ0kjl6DspdWX1aGY1/loyXnP0JS06e/A==",
+      "requires": {
+        "@types/hammerjs": "^2.0.36"
+      }
+    },
     "@emotion/is-prop-valid": {
       "version": "0.8.6",
       "resolved": "https://registry.npmjs.org/@emotion/is-prop-valid/-/is-prop-valid-0.8.6.tgz",
@@ -1541,6 +1549,11 @@
         "@types/node": "*"
       }
     },
+    "@types/hammerjs": {
+      "version": "2.0.36",
+      "resolved": "https://registry.npmjs.org/@types/hammerjs/-/hammerjs-2.0.36.tgz",
+      "integrity": "sha512-7TUK/k2/QGpEAv/BCwSHlYu3NXZhQ9ZwBYpzr9tjlPIL2C5BeGhH3DmVavRx3ZNyELX5TLC91JTz/cen6AAtIQ=="
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -7951,6 +7964,11 @@
         "object.assign": "^4.1.0"
       }
     },
+    "keycharm": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/keycharm/-/keycharm-0.2.0.tgz",
+      "integrity": "sha1-+m6i5DuQpoAohD0n8gddNajD5vk="
+    },
     "killable": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/killable/-/killable-1.0.1.tgz",
@@ -11296,6 +11314,24 @@
       "resolved": "https://registry.npmjs.org/react-error-overlay/-/react-error-overlay-6.0.5.tgz",
       "integrity": "sha512-+DMR2k5c6BqMDSMF8hLH0vYKtKTeikiFW+fj0LClN+XZg4N9b8QUAdHC62CGWNLTi/gnuuemNcNcTFrCvK1f+A=="
     },
+    "react-graph-vis": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/react-graph-vis/-/react-graph-vis-1.0.5.tgz",
+      "integrity": "sha512-y7+eHcwj7GryRoY+ZawwsDmS8OMeJ8Gpzmzejqwz+T2qg6IYTk1bod42H5g3J2zzHcPaqAZpwxZG3d3YB4nBwQ==",
+      "requires": {
+        "lodash": "^4.17.15",
+        "prop-types": "^15.5.10",
+        "uuid": "^2.0.1",
+        "vis-network": "^5.1.1"
+      },
+      "dependencies": {
+        "uuid": {
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho="
+        }
+      }
+    },
     "react-is": {
       "version": "16.12.0",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.12.0.tgz",
@@ -13586,6 +13622,51 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "vis-data": {
+      "version": "6.3.5",
+      "resolved": "https://registry.npmjs.org/vis-data/-/vis-data-6.3.5.tgz",
+      "integrity": "sha512-H8lD1NTmC5HimYeqTouxhbUya5qrYQGjpJhIHkxsm5R34EEdcm/D1cLTMLFFyIoZC6SQkADQj+dlFKf5DOnSww==",
+      "requires": {
+        "vis-util": "2.0.1",
+        "vis-uuid": "1.1.3"
+      },
+      "dependencies": {
+        "vis-util": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/vis-util/-/vis-util-2.0.1.tgz",
+          "integrity": "sha512-VBQ6zCT+Iaum70uzLbjk0nLMOjp9NhPzU42j0gaM6q6tg0eTcgIWNXzAqamhQtmm1kDj0jMLzKvkFOPENYv34w==",
+          "optional": true
+        }
+      }
+    },
+    "vis-network": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/vis-network/-/vis-network-5.4.1.tgz",
+      "integrity": "sha512-hUJlFWoCmLup6IxoXCr//OO2ZCkC8jrXEkkHLG1DhBgB54Y3K33+e5q4tc436inMlGzfqqaKTIToNbOGr8Szww==",
+      "requires": {
+        "@egjs/hammerjs": "^2.0.15",
+        "component-emitter": "^1.3.0",
+        "keycharm": "^0.2.0",
+        "moment": "^2.24.0",
+        "timsort": "^0.3.0",
+        "vis-data": "^6.1.1",
+        "vis-util": "^1.1.6"
+      }
+    },
+    "vis-util": {
+      "version": "1.1.10",
+      "resolved": "https://registry.npmjs.org/vis-util/-/vis-util-1.1.10.tgz",
+      "integrity": "sha512-8hGSxsFi2ogYYweClQyITzWnirWgQ8p0i9M4d3OXMuUO8vjXrf+2zHOYI9OZbtUduxAWuMEePnS9BXDtPJmJ7Q==",
+      "requires": {
+        "moment": "2.24.0",
+        "vis-uuid": "1.1.3"
+      }
+    },
+    "vis-uuid": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/vis-uuid/-/vis-uuid-1.1.3.tgz",
+      "integrity": "sha512-2B6XdY1bkzbUh+TugmnAaFa61KO9R5pzBzIuFIm8a9FrkbxIdSmQXV+FbfkL8QunkQV/bT0JDLQ2puqCS2+0Og=="
+    },
     "vm-browserify": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.2.tgz",

package.json

@@ -10,6 +10,7 @@
     "axios": "^0.19.2",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
+    "react-graph-vis": "^1.0.5",
     "react-router-dom": "^5.1.2",
     "react-scripts": "3.3.1",
     "react-sigma": "^1.2.34",

src/App.js

@@ -7,7 +7,7 @@ function App() {
   return (
     <Layout>
       <h1>Dijkstra</h1>
-      <p>Dijkstra is an app thas uses Dijkstra algorithm to display the shortest path between different cities in Belgium.</p>
+      <p>Find the shortest path between different cities in Belgium with Dijkstra algorithm.</p>
       <HomeView/>
     </Layout>
   );

src/components/HomeView.jsx

@@ -1,66 +1,85 @@
 import React, { useState ,useEffect } from "react";
-import Axios from '../utils/API';
+import { fetchRoads, fetchCities, getShortestPath } from './requests';
+import {Sigma, RandomizeNodePositions, RelativeSize, SigmaEnableSVG} from 'react-sigma';
 import { Select, Button, Icon } from 'antd';
+
 const { Option } = Select;
 
 function HomeView() {
-    const [cities, setCities] = useState([]);
     const [startingPoint, setStartingPoint] = useState();
     const [destination, setDestination] = useState();
+    const [errorSelect, setError] = useState({ message: '', flag: false });
     const [shortestPath, setShortestPath] = useState();
-    const [errorMessage, setErrorMessage] = useState();
     
+    const [cities, setCities] = useState([]);
     useEffect(() => {
-        async function fetchData() {
+        fetchCities()
-            try {
+            .then(data => setCities(data))
-                const { data } = await Axios.get(
+            .catch(error => console.log(error))
-                    `/countries/1`
-                );
-                setCities(data);
-            } catch (error) {
-                console.error(error);
-            }
-        };
-        fetchData();
     }, []);
     
+    const [roads, setRoads] = useState([]);
+    useEffect(() => {
+        fetchRoads()
+            .then(data => setRoads(data))
+            .catch(error => console.log(error));
+    }, []);
+    
+
+    const [graph, setGraph] = useState({nodes: [], edges: []});
+    useEffect(() => {
+        let nodes = cities.map(node => (
+            { id: `n${node.id}`, label: node.name}
+        ));
+
+        let edges = roads.map(edge => (
+            { id: `e${edge.id}`, source: `n${edge.start_city_id}`, target: `n${edge.end_city_id}`, label: 'SEES' }
+        ))
+
+        setGraph({nodes, edges})
+    }, [cities, roads])
+
+
     function handleStart(city_id) {
         // eslint-disable-next-line
         let [ startingPoint ] = cities.filter(city => city.id == city_id);
         setStartingPoint(startingPoint);
+        // Check if start and destination are the same
+        if (startingPoint === destination) {
+            setError({ message: 'The start and destination must be different.', flag: true });
+            return
+        }
+        // Will reset the error message and shown path
+        setShortestPath();
+        setError({ flag: false });
     }
 
     function handleDestination(city_id) {
         // eslint-disable-next-line
         let [ destination ] = cities.filter(city => city.id == city_id);
         setDestination(destination);
+        // Check if start and destination are the same
+        if (startingPoint === destination) {
+            setError({ message: 'The start and destination must be different.', flag: true });
+            return
         }
+        // Will reset the error message and shown path
+        setShortestPath();
+        setError({ flag: false });
+    }
+
 
     function handleSubmit() {
         if (startingPoint === destination) {
-            setErrorMessage('Starting Point and Destination must be different cities.');
             return
-        } else if (startingPoint && destination) {
+        } else 
-                async function getPath() {
+        if (startingPoint && destination) {
-                    try {
+            getShortestPath(startingPoint.id, destination.id)
-                        const response = await Axios.get(
+                .then(data => setShortestPath(data))
-                            `/path`,
+                .catch(error => console.log(error));
-                            {
+            setError({ flag: false });
-                                params: {
-                                    start_city_id: startingPoint.id,
-                                    end_city_id: destination.id
-                                }
-                            }
-                            );
-                            setShortestPath(response.data)
-                            setErrorMessage();
-                    } catch (error) {
-                        console.error(error);
-                    }
-                }
-                getPath();
         } else {
-            setErrorMessage('Please select a Starting point and a Destination');
+            setError({ message: 'Please select a start and a destination', flag: true});
         }
     }
 
@@ -74,6 +93,7 @@ function HomeView() {
                     <Select 
                         defaultValue="Choose a city"
                         onChange={handleStart}
+                        style={{ width: 139 }}
                     >
                         {cities.map(city => (
                             <Option key={city.id}>{city.name}</Option>
@@ -89,6 +109,7 @@ function HomeView() {
                     <Select
                         defaultValue="Choose a city"
                         onChange={handleDestination}
+                        style={{ width: 139 }}
                     >
                         {cities.map(city => (
                             <Option key={city.id}>{city.name}</Option>
@@ -104,21 +125,32 @@ function HomeView() {
                     Get shortest path between the cities
                     <Icon type="right" />
                 </Button>
-                {errorMessage &&
+                {errorSelect.flag &&
-                <p>{errorMessage}</p>
+                <p>{errorSelect.message}</p>
                 }
             </section>
             {
             shortestPath && 
             <section>
-                <h2>Shortest path from {startingPoint.name} to {destination.name}</h2>
+                <h2>Shortest path from {startingPoint.name} to {destination.name} ({shortestPath.distance}km)</h2>
-                <p>{shortestPath.path.map(city => (
+                <div>{shortestPath.path.map(city => (
-                    <><span>{city.name}</span><Icon type="right" /></>
+                    <p key={city.id}><Icon type="right" /><span>{city.name}</span></p>
                     ))}
-                </p>
+                </div>
 
             </section>
             }
+            { graph.nodes.length > 0 &&
+
+                <div>
+                <p>Graph</p>
+                <Sigma graph={graph} settings={{drawEdges: true, clone: false}} renderer="svg">
+                    <RelativeSize initialSize={50}/>
+                    <RandomizeNodePositions/>
+                </Sigma>
+                </div>
+
+            }
         </main>
     );
 }

src/components/requests.js

@@ -0,0 +1,40 @@
+import Axios from '../utils/API';
+
+export async function fetchRoads() {
+    try {
+        const { data } = await Axios.get(
+            `api/roads`
+        );
+        return data
+    } catch (error) {
+        console.error(error);
+    }
+};
+
+export async function fetchCities() {
+    try {
+        const { data } = await Axios.get(
+            `api/countries/1`
+            );
+        return data
+    } catch (error) {
+        console.error(error);
+    }
+};
+
+export async function getShortestPath(startingPointId, destinationID) {
+    try {
+        const response = await Axios.get(
+            `api/path`,
+            {
+                params: {
+                    start_city_id: startingPointId,
+                    end_city_id: destinationID
+                }
+            }
+            );
+            return response.data
+    } catch (error) {
+        console.error(error);
+    }
+}

src/utils/API.js

@@ -1,6 +1,6 @@
 import axios from "axios";
 
 export default axios.create({
-    baseURL: "https://dijkstra-backend.herokuapp.com/api",
+    baseURL: "https://dijkstra-backend.herokuapp.com/",
     responseType: "json"
 });