| 1 | "use client"; |
| 2 | |
| 3 | import { useState, useMemo, useRef, useCallback, useEffect } from "react"; |
| 4 | import { faqSourceHref } from "@/lib/faq-source"; |
| 5 | import { extractText } from "@/lib/react-text"; |
| 6 | import { highlightSpan } from "@/lib/search-utils"; |
| 7 | |
| 8 | export interface FaqSearchItem { |
| 9 | q: string; |
| 10 | a: React.ReactNode; |
| 11 | sources?: string[]; |
| 12 | } |
| 13 | |
| 14 | /* ------------------------------------------------------------------ */ |
| 15 | /* Highlight helper */ |
| 16 | /* ------------------------------------------------------------------ */ |
| 17 | |
| 18 | function highlight(text: string, query: string): React.ReactNode { |
| 19 | // Index arithmetic lives in search-utils: lowercasing can change a |
| 20 | // string's length, so `text` cannot be sliced with indices taken from |
| 21 | // its lowercased copy. |
| 22 | const span = highlightSpan(text, query); |
| 23 | if (!span) return text; |
| 24 | return ( |
| 25 | <> |
| 26 | {span.before} |
| 27 | <mark className="search-highlight">{span.match}</mark> |
| 28 | {span.after} |
| 29 | </> |
| 30 | ); |
| 31 | } |
| 32 | |
| 33 | /* ------------------------------------------------------------------ */ |
| 34 | /* Component */ |
| 35 | /* ------------------------------------------------------------------ */ |
| 36 | |
| 37 | export function FaqSearch({ |
| 38 | items, |
| 39 | locale, |
| 40 | }: { |
| 41 | items: FaqSearchItem[]; |
| 42 | locale: string; |
| 43 | }) { |
| 44 | const isZh = locale === "zh"; |
| 45 | const [query, setQuery] = useState(""); |
| 46 | const inputRef = useRef<HTMLInputElement>(null); |
| 47 | |
| 48 | // Precompute haystack for each item (question + answer text + sources). |
| 49 | const haystacks = useMemo( |
| 50 | () => |
| 51 | items.map((item) => { |
| 52 | const parts = [ |
| 53 | item.q, |
| 54 | extractText(item.a), |
| 55 | ...(item.sources ?? []), |
| 56 | ]; |
| 57 | return parts.join(" ").toLowerCase(); |
| 58 | }), |
| 59 | [items], |
| 60 | ); |
| 61 | |
| 62 | const filtered = useMemo(() => { |
| 63 | const q = query.trim().toLowerCase(); |
| 64 | if (!q) return items.map((item, i) => ({ item, i })); |
| 65 | return items |
| 66 | .map((item, i) => ({ item, i })) |
| 67 | .filter(({ i }) => haystacks[i].includes(q)); |
| 68 | }, [query, haystacks, items]); |
| 69 | |
| 70 | // Keyboard shortcut: focus search on "/". |
| 71 | const handleKeyDown = useCallback((e: KeyboardEvent) => { |
| 72 | if (e.key === "/" && document.activeElement?.tagName !== "INPUT") { |
| 73 | e.preventDefault(); |
| 74 | inputRef.current?.focus(); |
| 75 | } |
| 76 | }, []); |
| 77 | |
| 78 | useEffect(() => { |
| 79 | window.addEventListener("keydown", handleKeyDown); |
| 80 | return () => window.removeEventListener("keydown", handleKeyDown); |
| 81 | }, [handleKeyDown]); |
| 82 | |
| 83 | const total = items.length; |
| 84 | const matched = filtered.length; |
| 85 | const hasQuery = query.trim().length > 0; |
| 86 | |
| 87 | return ( |
| 88 | <> |
| 89 | {/* Search bar */} |
| 90 | <div className="mb-6"> |
| 91 | <div className="relative"> |
| 92 | <input |
| 93 | ref={inputRef} |
| 94 | type="text" |
| 95 | value={query} |
| 96 | onChange={(e) => setQuery(e.target.value)} |
| 97 | placeholder={ |
| 98 | isZh |
| 99 | ? "搜索常见问题…（按 / 快速聚焦）" |
| 100 | : "Search FAQ… (press / to focus)" |
| 101 | } |
| 102 | className="search-input w-full" |
| 103 | aria-label={isZh ? "搜索常见问题" : "Search FAQ"} |
| 104 | /> |
| 105 | {hasQuery && ( |
| 106 | <button |
| 107 | onClick={() => setQuery("")} |
| 108 | className="absolute right-3 top-1/2 -translate-y-1/2 font-mono text-sm text-ink-mute hover:text-indigo transition-colors" |
| 109 | aria-label={isZh ? "清除" : "Clear"} |
| 110 | > |
| 111 | ✕ |
| 112 | </button> |
| 113 | )} |
| 114 | </div> |
| 115 | {hasQuery && ( |
| 116 | <div className="mt-2 font-mono text-[0.7rem] text-ink-mute" aria-live="polite"> |
| 117 | {matched > 0 |
| 118 | ? isZh |
| 119 | ? `${matched} / ${total} 个问题匹配 "${query.trim()}"` |
| 120 | : `${matched} of ${total} questions match "${query.trim()}"` |
| 121 | : isZh |
| 122 | ? `未找到匹配 "${query.trim()}" 的问题` |
| 123 | : `No questions match "${query.trim()}"`} |
| 124 | </div> |
| 125 | )} |
| 126 | </div> |
| 127 | |
| 128 | {/* FAQ list */} |
| 129 | {matched > 0 ? ( |
| 130 | <div className="space-y-0 hairline-t hairline-b"> |
| 131 | {filtered.map(({ item, i }) => ( |
| 132 | <details key={i} className="group hairline-b last:border-b-0"> |
| 133 | <summary className="px-0 py-5 cursor-pointer flex items-start gap-4 hover:text-indigo transition-colors"> |
| 134 | <span className="font-mono text-indigo tabular text-sm pt-0.5 shrink-0"> |
| 135 | {String(i + 1).padStart(2, "0")} |
| 136 | </span> |
| 137 | <span className="font-display text-lg leading-snug flex-1"> |
| 138 | {highlight(item.q, query)} |
| 139 | </span> |
| 140 | <span className="font-mono text-ink-mute text-sm group-open:rotate-45 transition-transform shrink-0">+</span> |
| 141 | </summary> |
| 142 | <div className="pb-5 pl-10 pr-4"> |
| 143 | <div className={`text-ink-soft leading-relaxed ${isZh ? "leading-[1.9] tracking-wide" : ""}`}> |
| 144 | {item.a} |
| 145 | </div> |
| 146 | {item.sources && item.sources.length > 0 && ( |
| 147 | <div className="mt-3 flex items-center gap-2 flex-wrap"> |
| 148 | <span className="font-mono text-[0.66rem] text-ink-mute uppercase tracking-wider"> |
| 149 | {isZh ? "来源" : "Sources"}: |
| 150 | </span> |
| 151 | {item.sources.map((s) => { |
| 152 | const href = faqSourceHref(s); |
| 153 | return href ? ( |
| 154 | <a |
| 155 | key={s} |
| 156 | href={href} |
| 157 | target="_blank" |
| 158 | rel="noreferrer" |
| 159 | className="font-mono text-[0.7rem] text-indigo hover:underline" |
| 160 | > |
| 161 | {s} |
| 162 | </a> |
| 163 | ) : ( |
| 164 | <span key={s} className="font-mono text-[0.7rem] text-indigo">{s}</span> |
| 165 | ); |
| 166 | })} |
| 167 | </div> |
| 168 | )} |
| 169 | </div> |
| 170 | </details> |
| 171 | ))} |
| 172 | </div> |
| 173 | ) : ( |
| 174 | <div className="text-center py-16 hairline-t hairline-b"> |
| 175 | <p className="font-display text-lg text-ink-mute mb-2"> |
| 176 | {isZh ? "未找到结果" : "No results found"} |
| 177 | </p> |
| 178 | <p className="text-sm text-ink-mute"> |
| 179 | {isZh |
| 180 | ? "尝试使用不同的关键字。" |
| 181 | : "Try a different keyword."} |
| 182 | </p> |
| 183 | </div> |
| 184 | )} |
| 185 | </> |
| 186 | ); |
| 187 | } |
| 188 |