From 07f1a6c2ea5ad5b1cded9b3493c8fbded00d5a44 Mon Sep 17 00:00:00 2001
From: rui hildt <ruihildt@protonmail.com>
Date: Wed, 22 Jul 2020 20:46:13 +0200
Subject: [PATCH] Implement debounced search query

---
 package.json                 |  2 ++
 src/components/SearchBox.tsx | 60 ++++++++++++++++++++++++++++--------
 yarn.lock                    |  5 +++
 3 files changed, 54 insertions(+), 13 deletions(-)

diff --git a/package.json b/package.json
index 79ccb60..1531ff4 100644
--- a/package.json
+++ b/package.json
@@ -8,12 +8,14 @@
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
     "@types/jest": "^24.0.0",
+    "@types/lodash": "^4.14.158",
     "@types/node": "^12.0.0",
     "@types/react": "^16.9.0",
     "@types/react-dom": "^16.9.0",
     "graphql": "^15.3.0",
     "grommet": "^2.14.0",
     "grommet-icons": "^4.4.0",
+    "lodash": "^4.17.19",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "3.4.1",
diff --git a/src/components/SearchBox.tsx b/src/components/SearchBox.tsx
index da230c3..a5c9112 100644
--- a/src/components/SearchBox.tsx
+++ b/src/components/SearchBox.tsx
@@ -1,17 +1,54 @@
-import React, { useState } from 'react';
+import React, { useState, useCallback, useEffect } from 'react';
+import { gql, useLazyQuery } from '@apollo/client';
 import { Box, TextInput } from 'grommet';
 import { FormSearch } from 'grommet-icons';
+import { debounce } from 'lodash';
+
+const SEARCH_ARTIST = gql`
+	query Artist($byName: String!) {
+		queryArtists(byName: $byName) {
+			name
+		}
+	}
+`;
 
 export const SearchBox = () => {
 	const [value, setValue] = useState('');
+	const [getArtist, { loading, data }] = useLazyQuery(SEARCH_ARTIST);
+	const [suggestions, setSuggestions] = useState(['']);
+	// TODO: Find a solution to have suggestions not showing when empty
 
-	let suggestions = [
-		'The Doors',
-		'The Doors With Eddie Vedder',
-		'The Doorstep Carolers',
-		'The Doors Experience',
-		'Darken the Doorstep',
-	];
+	// Debounce the database query, based on the following article:
+	// https://dev.to/reflexgravity/use-lodash-debouce-inside-a-functional-component-in-react-4g5j
+	const updateQuery = () => {
+		getArtist({ variables: { byName: value } });
+	};
+
+	const delayedQuery = useCallback(debounce(updateQuery, 500), [value]);
+
+	const handleChange = (e: any) => {
+		setValue(e.target.value);
+	};
+
+	useEffect(() => {
+		delayedQuery();
+
+		// Cancel previous debounce calls during useEffect cleanup.
+		return delayedQuery.cancel;
+	}, [value, delayedQuery]);
+
+	useEffect(() => {
+		// TODO: Maybe merge the two use effects?
+		if (data) {
+			const mapSuggestions: string[] = data.queryArtists.map(
+				(el: { name: string }) => {
+					return el.name;
+				},
+			);
+			const updatedSuggestions = mapSuggestions.slice(0, 5);
+			setSuggestions(updatedSuggestions);
+		}
+	}, [data]);
 
 	return (
 		<Box
@@ -22,14 +59,11 @@ export const SearchBox = () => {
 		>
 			<TextInput
 				value={value}
-				onChange={(event) => setValue(event.target.value)}
+				onChange={handleChange}
 				placeholder='Type an artist name'
 				icon={<FormSearch color='plain' />}
-				dropProps={{
-					overflow: 'visible',
-				}}
 				dropHeight='large'
-				suggestions={suggestions}
+				suggestions= {suggestions}
 			/>
 		</Box>
 	);
diff --git a/yarn.lock b/yarn.lock
index 0160d40..476ca0b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1607,6 +1607,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.4.tgz#38fd73ddfd9b55abb1e1b2ed578cb55bd7b7d339"
   integrity sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==
 
+"@types/lodash@^4.14.158":
+  version "4.14.158"
+  resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.158.tgz#b38ea8b6fe799acd076d7a8d7ab71c26ef77f785"
+  integrity sha512-InCEXJNTv/59yO4VSfuvNrZHt7eeNtWQEgnieIA+mIC+MOWM9arOWG2eQ8Vhk6NbOre6/BidiXhkZYeDY9U35w==
+
 "@types/minimatch@*":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"