feat: ai term suggestion input

src/components/GenerateRoadmap/AITermSuggestionInput.tsx

@@ -0,0 +1,181 @@
+import {
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+  type InputHTMLAttributes,
+} from 'react';
+import { cn } from '../../lib/classname';
+import { useOutsideClick } from '../../hooks/use-outside-click';
+import { useDebounceValue } from '../../hooks/use-debounce';
+import { httpGet } from '../../lib/http';
+import { useToast } from '../../hooks/use-toast';
+
+type GetTopAIRoadmapTermResponse = {
+  _id: string;
+  term: string;
+  title: string;
+}[];
+
+type AITermSuggestionInputProps = {
+  value: string;
+  onValueChange: (value: string) => void;
+  onSelect?: (roadmapId: string) => void;
+  inputClassName?: string;
+  wrapperClassName?: string;
+  placeholder?: string;
+} & Omit<InputHTMLAttributes<HTMLInputElement>, 'onSelect' | 'onChange'>;
+
+export function AITermSuggestionInput(props: AITermSuggestionInputProps) {
+  const {
+    value: defaultValue,
+    onValueChange,
+    onSelect,
+    inputClassName,
+    wrapperClassName,
+    placeholder,
+    ...inputProps
+  } = props;
+
+  const termCache = useMemo(
+    () => new Map<string, GetTopAIRoadmapTermResponse>(),
+    [],
+  );
+
+  const toast = useToast();
+  const searchInputRef = useRef<HTMLInputElement>(null);
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  const [isActive, setIsActive] = useState(false);
+  const [searchResults, setSearchResults] =
+    useState<GetTopAIRoadmapTermResponse>([]);
+  const [searchedText, setSearchedText] = useState(defaultValue);
+  const [activeCounter, setActiveCounter] = useState(0);
+  const debouncedSearchValue = useDebounceValue(searchedText, 500);
+
+  const loadTopAIRoadmapTerm = async () => {
+    if (debouncedSearchValue.length === 0) {
+      return [];
+    }
+
+    if (termCache.has(debouncedSearchValue)) {
+      const cachedData = termCache.get(debouncedSearchValue);
+      return cachedData || [];
+    }
+
+    const { response, error } = await httpGet<GetTopAIRoadmapTermResponse>(
+      `${import.meta.env.PUBLIC_API_URL}/v1-get-top-ai-roadmap-term`,
+      {
+        term: debouncedSearchValue,
+      },
+    );
+
+    if (error || !response) {
+      toast.error(error?.message || 'Something went wrong');
+      setSearchResults([]);
+      return [];
+    }
+
+    termCache.set(debouncedSearchValue, response);
+    return response;
+  };
+
+  useEffect(() => {
+    if (debouncedSearchValue.length === 0) {
+      setSearchResults([]);
+      return;
+    }
+
+    setIsActive(true);
+    loadTopAIRoadmapTerm().then((results) => {
+      setSearchResults(results?.slice(0, 5) || []);
+      setActiveCounter(0);
+    });
+  }, [debouncedSearchValue]);
+
+  useOutsideClick(dropdownRef, () => {
+    setIsActive(false);
+  });
+
+  return (
+    <div className={cn('relative', wrapperClassName)}>
+      <input
+        {...inputProps}
+        ref={searchInputRef}
+        type="text"
+        value={searchedText}
+        className={cn(
+          'w-full rounded-md border border-gray-400 px-3 py-2.5 transition-colors focus:border-black focus:outline-none',
+          inputClassName,
+        )}
+        placeholder={placeholder}
+        autoComplete="off"
+        onInput={(e) => {
+          const value = (e.target as HTMLInputElement).value.trim();
+          setSearchedText(value);
+          onValueChange(value);
+        }}
+        onFocus={() => {
+          setIsActive(true);
+        }}
+        onKeyDown={(e) => {
+          if (e.key === 'ArrowDown') {
+            const canGoNext = activeCounter < searchResults.length - 1;
+            setActiveCounter(canGoNext ? activeCounter + 1 : 0);
+          } else if (e.key === 'ArrowUp') {
+            const canGoPrev = activeCounter > 0;
+            setActiveCounter(
+              canGoPrev ? activeCounter - 1 : searchResults.length - 1,
+            );
+          } else if (e.key === 'Tab') {
+            if (isActive) {
+              e.preventDefault();
+            }
+          } else if (e.key === 'Escape') {
+            setSearchedText('');
+            setIsActive(false);
+          } else if (e.key === 'Enter') {
+            e.preventDefault();
+            const activeData = searchResults[activeCounter];
+            if (activeData) {
+              onValueChange(activeData.term);
+              onSelect?.(activeData._id);
+              setIsActive(false);
+            }
+          }
+        }}
+      />
+
+      {isActive && searchResults.length > 0 && (
+        <div
+          className="absolute top-full z-50 mt-1 w-full rounded-md border bg-white px-2 py-2 shadow"
+          ref={dropdownRef}
+        >
+          <div className="flex flex-col">
+            {searchResults.map((result, counter) => {
+              return (
+                <button
+                  key={result?._id}
+                  type="button"
+                  className={cn(
+                    'flex w-full items-center rounded p-2 text-sm',
+                    counter === activeCounter ? 'bg-gray-100' : '',
+                  )}
+                  onMouseOver={() => setActiveCounter(counter)}
+                  onClick={() => {
+                    onValueChange(result?.term);
+                    onSelect?.(result._id);
+                    setSearchedText('');
+                    setIsActive(false);
+                  }}
+                >
+                  {result?.title || result?.term}
+                </button>
+              );
+            })}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

src/components/GenerateRoadmap/RoadmapSearch.tsx

@@ -12,6 +12,8 @@ import { showLoginPopup } from '../../lib/popup';
 import { cn } from '../../lib/classname.ts';
 import { useState } from 'react';
 import { OpenAISettings } from './OpenAISettings.tsx';
+import { AITermSuggestionInput } from './AITermSuggestionInput.tsx';
+import { setUrlParams } from '../../lib/browser.ts';
 
 type RoadmapSearchProps = {
   roadmapTerm: string;
@@ -78,15 +80,15 @@ export function RoadmapSearch(props: RoadmapSearchProps) {
           }}
           className="flex w-full flex-col gap-2 sm:flex-row"
         >
-          <input
-            autoFocus
-            type="text"
-            placeholder="Enter a topic to generate a roadmap for"
-            className="w-full rounded-md border border-gray-400 px-3 py-2.5 transition-colors focus:border-black focus:outline-none"
+          <AITermSuggestionInput
+            autoFocus={true}
             value={roadmapTerm}
-            onInput={(e) =>
-              setRoadmapTerm((e.target as HTMLInputElement).value)
-            }
+            onValueChange={(value) => setRoadmapTerm(value)}
+            placeholder="Enter a topic to generate a roadmap for"
+            wrapperClassName="w-full"
+            onSelect={(roadmapId) => {
+              setUrlParams({ id: roadmapId });
+            }}
           />
           <button
             className={cn(

src/hooks/use-debounce.ts

@@ -0,0 +1,17 @@
+import { useEffect, useState } from 'react';
+
+export function useDebounceValue<T>(value: T, delay: number): T {
+  const [debouncedValue, setDebouncedValue] = useState(value);
+
+  useEffect(() => {
+    const handler = setTimeout(() => {
+      setDebouncedValue(value);
+    }, delay);
+
+    return () => {
+      clearTimeout(handler);
+    };
+  }, [value, delay]);
+
+  return debouncedValue;
+}