implement the Autocomplete component

src/App.tsx

@@ -1,73 +1,40 @@
-import React from 'react';
+import React, { useState, useCallback } from 'react';
+
 import './App.scss';
 import { peopleFromServer } from './data/people';
+import { Autocomplete } from './components/Autocomplete';
+import { Person } from './types/Person';
 
 export const App: React.FC = () => {
-  const { name, born, died } = peopleFromServer[0];
+  const [selectedPerson, setSelectedPerson] = useState<Person | null>(null);
+
+  const getSelectedPersonTitle = (): string => {
+    if (selectedPerson) {
+      return (
+        `${selectedPerson.name}` +
+        ` (${selectedPerson.born} - ${selectedPerson.died})`
+      );
+    }
+
+    return 'No selected person';
+  };
+
+  const onSelected = useCallback((person: Person | null) => {
+    setSelectedPerson(person);
+  }, []);
 
   return (
     <div className="container">
       <main className="section is-flex is-flex-direction-column">
         <h1 className="title" data-cy="title">
-          {`${name} (${born} - ${died})`}
+          {getSelectedPersonTitle()}
         </h1>
 
-        <div className="dropdown is-active">
-          <div className="dropdown-trigger">
-            <input
-              type="text"
-              placeholder="Enter a part of the name"
-              className="input"
-              data-cy="search-input"
-            />
-          </div>
-
-          <div className="dropdown-menu" role="menu" data-cy="suggestions-list">
-            <div className="dropdown-content">
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-link">Pieter Haverbeke</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-link">Pieter Bernard Haverbeke</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-link">Pieter Antone Haverbeke</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-danger">Elisabeth Haverbeke</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-link">Pieter de Decker</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-danger">Petronella de Decker</p>
-              </div>
-
-              <div className="dropdown-item" data-cy="suggestion-item">
-                <p className="has-text-danger">Elisabeth Hercke</p>
-              </div>
-            </div>
-          </div>
-        </div>
-
-        <div
-          className="
-            notification
-            is-danger
-            is-light
-            mt-3
-            is-align-self-flex-start
-          "
-          role="alert"
-          data-cy="no-suggestions-message"
-        >
-          <p className="has-text-danger">No matching suggestions</p>
-        </div>
+        <Autocomplete
+          people={peopleFromServer}
+          delay={1_000}
+          onSelected={onSelected}
+        />
       </main>
     </div>
   );

src/components/Autocomplete/Autocomplete.tsx

@@ -0,0 +1,143 @@
+import React, {
+  useState,
+  useCallback,
+  useMemo,
+  useRef,
+  useEffect,
+} from 'react';
+import cn from 'classnames';
+import debounce from 'lodash.debounce';
+
+import { Person } from '../../types/Person';
+
+type Props = {
+  people: Person[];
+  delay?: number;
+  onSelected?: (person: Person | null) => void;
+};
+
+const AutocompleteBase: React.FC<Props> = ({
+  people,
+  delay = 300,
+  onSelected = () => {},
+}) => {
+  const [query, setQuery] = useState('');
+  const [appliedQuery, setAppliedQuery] = useState('');
+  const [isOptionsOpen, setIsOptionsOpen] = useState(false);
+  const [selectedOption, setSelectedOption] = useState<Person | null>(null);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const applyQuery = useCallback(debounce(setAppliedQuery, delay), [delay]);
+
+  const selectOption = (option: Person | null) => {
+    setSelectedOption(option);
+    onSelected(option);
+  };
+
+  const onQueryChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const currentQuery = e.target.value;
+
+    setQuery(currentQuery);
+    applyQuery(currentQuery);
+
+    if (selectedOption) {
+      selectOption(null);
+    }
+  };
+
+  const visibleOptions = useMemo(() => {
+    return people.filter(person => {
+      const personName = person.name.trim().toLowerCase();
+      const filterQuery = appliedQuery.trim().toLowerCase();
+
+      return personName.includes(filterQuery);
+    });
+  }, [appliedQuery, people]);
+
+  const handleFocus = () => {
+    setIsOptionsOpen(true);
+  };
+
+  const handleSelectOption = (person: Person) => {
+    selectOption(person);
+    setQuery(person.name);
+    setIsOptionsOpen(false);
+  };
+
+  useEffect(() => {
+    const closeOptions = (event: PointerEvent) => {
+      if (event.target !== inputRef.current) {
+        setIsOptionsOpen(false);
+      }
+    };
+
+    document.body.addEventListener('click', closeOptions);
+
+    return () => {
+      document.body.removeEventListener('click', closeOptions);
+    };
+  }, [inputRef]);
+
+  return (
+    <>
+      <div
+        className={cn('dropdown', {
+          'is-active': visibleOptions.length !== 0 && isOptionsOpen,
+        })}
+      >
+        <div className="dropdown-trigger">
+          <input
+            ref={inputRef}
+            id="search-people-input"
+            type="text"
+            placeholder="Enter a part of the name"
+            className="input"
+            data-cy="search-input"
+            value={query}
+            onChange={onQueryChange}
+            onFocus={handleFocus}
+          />
+        </div>
+        <div className="dropdown-menu" role="menu" data-cy="suggestions-list">
+          <div className="dropdown-content">
+            {visibleOptions.map(person => (
+              <button
+                key={person.slug}
+                className="dropdown-item"
+                data-cy="suggestion-item"
+                onClick={() => handleSelectOption(person)}
+              >
+                <p
+                  className={cn('has-text-link', {
+                    'has-text-danger': person.sex === 'f',
+                  })}
+                >
+                  {person.name}
+                </p>
+              </button>
+            ))}
+          </div>
+        </div>
+      </div>
+      {visibleOptions.length === 0 && (
+        <div
+          className="
+            notification
+            is-danger
+            is-light
+            mt-3
+            is-align-self-flex-start
+          "
+          role="alert"
+          data-cy="no-suggestions-message"
+        >
+          <p className="has-text-danger">No matching suggestions</p>
+        </div>
+      )}
+    </>
+  );
+};
+
+export const Autocomplete = React.memo(AutocompleteBase);

src/components/Autocomplete/index.ts

@@ -0,0 +1 @@
+export * from './Autocomplete';