498 lines
15 KiB
TypeScript
498 lines
15 KiB
TypeScript
"use client";
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import { useRouter } from "next/navigation";
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import { useCallback, useMemo, useEffect, useState } from "react";
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import { Card, CardHeader, CardContent } from "@/components/ui/card";
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import { Badge } from "@/components/ui/badge";
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import { Button } from "@/components/ui/button";
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import { ChevronLeft, ChevronRight, Loader2 } from "lucide-react";
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import { MobileNav, type MobileNavGroup } from "@/components/layout/mobile-nav";
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import { JsonLd } from "@/components/seo/json-ld";
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import { articleJsonLd } from "@/lib/jsonld";
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import { BOOK_NAMES } from "@/lib/constants";
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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type Synonym = {
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word: string;
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meanings: string[];
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};
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type Verse = {
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id: string;
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book: string;
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division: string | null;
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chapter: number;
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verse: number;
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verseEnd: number | null;
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reference: string;
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bookTitle: string;
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devanagari: string;
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bengali: string | null;
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transliteration: string;
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synonyms: Synonym[];
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translation: string;
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purport: string[];
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};
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type VerseIndexEntry = {
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verse: number;
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verseEnd?: number;
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reference: string;
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};
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// ---------------------------------------------------------------------------
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// Props
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// ---------------------------------------------------------------------------
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type ChapterViewerProps = {
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/** The first verse (SSR'd), shown before any client-side fetch */
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initialVerse: Verse;
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/** The verse number of the initial verse */
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initialVerseNum: number;
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/** Lightweight index of ALL verses in the chapter (for the sidebar) */
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verseIndex: VerseIndexEntry[];
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/** Book key */
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book: string;
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/** Division: null for BG, canto string for SB, lila key for CC */
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division: string | null;
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/** Chapter number */
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chapter: number;
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/** Whether to show the Bengali script field (CC only) */
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showBengali?: boolean;
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/** Base path for verse URLs, e.g. "/books/bg/1" — verse number is appended */
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basePath: string;
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/** Mobile nav groups for the drawer */
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mobileNavGroups?: MobileNavGroup[];
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/** Book title for the mobile nav drawer header */
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mobileNavBookTitle?: string;
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};
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// ---------------------------------------------------------------------------
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// Navigation buttons (reused at top and bottom)
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// ---------------------------------------------------------------------------
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function VerseNav({
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currentIdx,
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total,
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onPrev,
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onNext,
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verseIndex,
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mobileNavGroups,
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currentVerseSlug,
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mobileNavBookTitle,
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}: {
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currentIdx: number;
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total: number;
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onPrev: () => void;
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onNext: () => void;
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verseIndex: VerseIndexEntry[];
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mobileNavGroups?: MobileNavGroup[];
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currentVerseSlug?: string;
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mobileNavBookTitle?: string;
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}) {
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const hasPrev = currentIdx > 0;
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const hasNext = currentIdx < total - 1;
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const current = verseIndex[currentIdx];
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const label = current
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? current.verseEnd
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? `${current.verse}–${current.verseEnd}`
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: String(current.verse)
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: "";
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return (
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<div className="flex items-center justify-between gap-3">
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<div className="flex items-center gap-2">
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{mobileNavGroups && mobileNavGroups.length > 0 && (
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<MobileNav
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groups={mobileNavGroups}
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currentSlug={currentVerseSlug ?? String(current?.verse ?? "")}
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bookTitle={mobileNavBookTitle}
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/>
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)}
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<Button
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variant="outline"
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size="sm"
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disabled={!hasPrev}
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onClick={onPrev}
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className="gap-1.5"
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>
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<ChevronLeft className="size-4" />
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<span className="hidden sm:inline">Previous</span>
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</Button>
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</div>
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<span className="text-sm text-muted-foreground">
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Verse {label} of {total}
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</span>
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<Button
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variant="outline"
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size="sm"
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disabled={!hasNext}
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onClick={onNext}
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className="gap-1.5"
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>
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<span className="hidden sm:inline">Next</span>
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<ChevronRight className="size-4" />
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</Button>
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</div>
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);
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}
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// ---------------------------------------------------------------------------
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// Verse card
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// ---------------------------------------------------------------------------
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function VerseCard({
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verse,
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showBengali,
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}: {
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verse: Verse;
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showBengali: boolean;
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}) {
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return (
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<Card id={`verse-${verse.verse}`} className="">
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<CardHeader className="border-b border-border bg-muted/50 py-3">
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<Badge variant="secondary">{verse.reference}</Badge>
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</CardHeader>
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<CardContent className="space-y-5 pt-5">
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{/* Bengali (CC only) */}
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{showBengali && verse.bengali && (
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<div className="text-center">
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<p className="text-xl leading-relaxed whitespace-pre-line font-serif text-green-800 dark:text-green-400">
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{verse.bengali}
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</p>
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</div>
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)}
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{/* Devanagari */}
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<div className="text-center">
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<p className="text-xl leading-relaxed text-red-800 dark:text-white whitespace-pre-line font-serif">
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{verse.devanagari}
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</p>
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</div>
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{/* Transliteration */}
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<div className="text-center">
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<p className="text-base italic text-muted-foreground whitespace-pre-line">
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{verse.transliteration}
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</p>
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</div>
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{/* Synonyms */}
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{verse.synonyms.length > 0 && (
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<div>
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<h3 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-2">
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Synonyms
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</h3>
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<p className="text-base text-foreground leading-relaxed">
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{verse.synonyms.map((s, i) => (
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<span key={i}>
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<span className="italic text-foreground">{s.word}</span>—
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{s.meanings.join(", ")}
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{i < verse.synonyms.length - 1 ? "; " : "."}
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</span>
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))}
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</p>
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</div>
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)}
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{/* Translation */}
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<div>
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<h3 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-2">
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Translation
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</h3>
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<p
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className="text-base text-foreground leading-relaxed font-medium"
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dangerouslySetInnerHTML={{ __html: verse.translation }}
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/>
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</div>
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{/* Purport */}
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{verse.purport.length > 0 && (
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<div>
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<h3 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-2">
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Purport
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</h3>
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<div className="text-base text-foreground leading-relaxed space-y-3">
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{verse.purport.map((p, i) =>
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// Cited ślokas come wrapped in <blockquote class="shloka"> — a
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// block element that can't live inside a <p>, so render those
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// in a <div> (styled centered + accent via globals.css); plain
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// prose paragraphs stay as <p>.
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/^\s*<blockquote/i.test(p) ? (
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<div key={i} dangerouslySetInnerHTML={{ __html: p }} />
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) : (
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<p key={i} dangerouslySetInnerHTML={{ __html: p }} />
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),
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)}
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</div>
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</div>
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)}
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</CardContent>
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</Card>
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);
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}
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// ---------------------------------------------------------------------------
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// ChapterViewer
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// ---------------------------------------------------------------------------
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export function ChapterViewer({
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initialVerse,
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initialVerseNum,
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verseIndex,
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book,
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division,
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chapter,
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showBengali = false,
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basePath,
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mobileNavGroups,
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mobileNavBookTitle,
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}: ChapterViewerProps) {
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const router = useRouter();
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// Verse cache: verseNum → Verse data
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const [cache, setCache] = useState<Map<number, Verse>>(() => {
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const map = new Map<number, Verse>();
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map.set(initialVerseNum, initialVerse);
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return map;
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});
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const [loading, setLoading] = useState(false);
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// Current verse number — driven by the initialVerseNum from the server
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// (which reads it from the [verse] path param)
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const currentVerseNum = initialVerseNum;
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// Current index in the verseIndex array
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const currentIdx = useMemo(
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() => verseIndex.findIndex((v) => v.verse === currentVerseNum),
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[verseIndex, currentVerseNum],
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);
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// The verse data to display
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const currentVerse = cache.get(currentVerseNum) ?? null;
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// Reset cache when route changes to a different chapter
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useEffect(() => {
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const map = new Map<number, Verse>();
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map.set(initialVerseNum, initialVerse);
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setCache(map);
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}, [initialVerse, initialVerseNum]);
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// Fetch a verse if it's not in the cache
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const fetchVerse = useCallback(
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async (verseNum: number) => {
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if (cache.has(verseNum)) return cache.get(verseNum)!;
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setLoading(true);
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const params = new URLSearchParams({
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chapter: String(chapter),
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verse: String(verseNum),
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});
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if (division !== null) {
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params.set("division", division);
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}
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try {
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const res = await fetch(`/api/books/${book}/verses?${params}`);
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if (!res.ok) throw new Error(`API error: ${res.status}`);
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const data = await res.json();
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// The API returns the verse in a paginated wrapper or an array
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const verse: Verse | undefined = Array.isArray(data.verses)
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? data.verses[0]
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: Array.isArray(data)
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? data[0]
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: undefined;
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if (verse) {
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setCache((prev) => {
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const next = new Map(prev);
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next.set(verseNum, verse);
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return next;
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});
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return verse;
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}
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} catch (err) {
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console.error("Failed to fetch verse:", err);
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} finally {
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setLoading(false);
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}
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return null;
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},
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[cache, book, division, chapter],
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);
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// Navigate to a verse — update the URL path and fetch if needed
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const navigateTo = useCallback(
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async (verseNum: number) => {
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// Prefetch the verse data before navigating
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if (!cache.has(verseNum)) {
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await fetchVerse(verseNum);
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}
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// Navigate to the new path-based URL
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router.push(`${basePath}/${verseNum}`, { scroll: false });
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// Scroll to top of the verse
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window.scrollTo({ top: 0, behavior: "smooth" });
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},
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[basePath, router, cache, fetchVerse],
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);
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// Fetch current verse on mount/URL change if not cached
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useEffect(() => {
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if (!cache.has(currentVerseNum)) {
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fetchVerse(currentVerseNum);
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}
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}, [currentVerseNum, cache, fetchVerse]);
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// Prefetch adjacent verses
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useEffect(() => {
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if (currentIdx > 0) {
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const prevNum = verseIndex[currentIdx - 1].verse;
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if (!cache.has(prevNum)) fetchVerse(prevNum);
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}
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if (currentIdx < verseIndex.length - 1) {
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const nextNum = verseIndex[currentIdx + 1].verse;
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if (!cache.has(nextNum)) fetchVerse(nextNum);
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}
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}, [currentIdx, verseIndex, cache, fetchVerse]);
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// Keyboard navigation
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useEffect(() => {
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const handleKey = (e: KeyboardEvent) => {
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if (
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e.target instanceof HTMLInputElement ||
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e.target instanceof HTMLTextAreaElement
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)
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return;
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if (e.key === "ArrowLeft" && currentIdx > 0) {
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e.preventDefault();
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navigateTo(verseIndex[currentIdx - 1].verse);
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} else if (e.key === "ArrowRight" && currentIdx < verseIndex.length - 1) {
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e.preventDefault();
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navigateTo(verseIndex[currentIdx + 1].verse);
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}
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};
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window.addEventListener("keydown", handleKey);
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return () => window.removeEventListener("keydown", handleKey);
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}, [currentIdx, verseIndex, navigateTo]);
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const goPrev = useCallback(() => {
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if (currentIdx > 0) navigateTo(verseIndex[currentIdx - 1].verse);
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}, [currentIdx, verseIndex, navigateTo]);
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const goNext = useCallback(() => {
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if (currentIdx < verseIndex.length - 1)
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navigateTo(verseIndex[currentIdx + 1].verse);
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}, [currentIdx, verseIndex, navigateTo]);
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return (
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<>
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{/* Structured data for the currently-shown verse (SSR'd for the initial
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verse, updates on client navigation). */}
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{currentVerse ? (
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<JsonLd
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data={articleJsonLd({
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path: `${basePath}/${currentVerseNum}`,
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headline: `${BOOK_NAMES[book] ?? book} ${currentVerse.reference}`,
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description: currentVerse.translation,
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isPartOf: BOOK_NAMES[book] ?? book,
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})}
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/>
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) : null}
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{/* ---- Sidebar: Verse Index ---- */}
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{/* Sticky sidebar. The max-h leaves 76px at the viewport bottom for
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the site footer so the sidebar doesn't slide behind it when the
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page is scrolled to the bottom. (89 sticky-top + 76 bottom gap
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= 165, hence calc(100vh - 165px).) */}
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<aside className="hidden lg:block w-64 shrink-0 sticky top-[89px] self-start max-h-[calc(100vh-165px)] overflow-y-auto py-8 pr-4">
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<h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3 px-2">
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Verses
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</h2>
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<nav className="grid grid-cols-3 gap-1">
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{verseIndex.map((v) => {
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const isActive = currentVerseNum === v.verse;
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const label = v.verseEnd
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? `${v.verse}–${v.verseEnd}`
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: String(v.verse);
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return (
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<a
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key={v.verse}
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href={`${basePath}/${v.verse}`}
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onClick={(e) => {
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e.preventDefault();
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navigateTo(v.verse);
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}}
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className={`px-2 py-1 rounded-md text-sm tabular-nums transition-colors ${
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isActive
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? "bg-primary/10 text-primary font-medium"
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: "text-muted-foreground hover:bg-muted hover:text-foreground"
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}`}
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>
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{label}
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</a>
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);
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})}
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</nav>
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</aside>
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{/* ---- Main: Single Verse ---- */}
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<main className="flex-1 min-w-0 px-6 py-8 space-y-6">
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{/* Top navigation */}
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<VerseNav
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currentIdx={currentIdx}
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total={verseIndex.length}
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onPrev={goPrev}
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onNext={goNext}
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verseIndex={verseIndex}
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mobileNavGroups={mobileNavGroups}
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currentVerseSlug={String(currentVerseNum)}
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mobileNavBookTitle={mobileNavBookTitle}
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/>
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{/* Verse content — id targeted by each page header's FindInPage. */}
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<div id="book-content">
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{loading && !currentVerse ? (
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<div className="flex items-center justify-center py-24 text-muted-foreground gap-2">
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<Loader2 className="size-5 animate-spin" />
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<span>Loading verse…</span>
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</div>
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) : currentVerse ? (
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<VerseCard verse={currentVerse} showBengali={showBengali} />
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) : (
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<div className="text-center py-24 text-muted-foreground">
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Verse not found.
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</div>
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)}
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</div>
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{/* Bottom navigation */}
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<VerseNav
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currentIdx={currentIdx}
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total={verseIndex.length}
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onPrev={goPrev}
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onNext={goNext}
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verseIndex={verseIndex}
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mobileNavGroups={mobileNavGroups}
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currentVerseSlug={String(currentVerseNum)}
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mobileNavBookTitle={mobileNavBookTitle}
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/>
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</main>
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</>
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);
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}
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