feat: tappable chord names in ChordChart, extractUniqueChords

app/app/components/chord-chart.tsx

@@ -1,27 +1,16 @@
 import type { LyricLine, Section } from "~/lib/types";
 
-// Max characters per rendered line. 38 fits comfortably on a 375px phone
-// at 14px monospace (≈8.4px per char with padding).
 const MAX_WIDTH = 38;
 
 interface Props {
   sections: Section[];
   fontSize?: 'sm' | 'base' | 'lg';
-}
-
-function buildChordRow(chords: { offset: number; chord: string }[]): string {
-  let row = "";
-  for (const { offset, chord } of chords) {
-    while (row.length < offset) row += " ";
-    row += chord;
-  }
-  return row;
+  onChordClick?: (chord: string) => void;
 }
 
 /** Split one LyricLine into segments that each fit within maxWidth characters. */
 function segmentLine(line: LyricLine, maxWidth: number): LyricLine[] {
   const { text, chords } = line;
-
   if (text.length <= maxWidth) return [line];
 
   const segments: LyricLine[] = [];
@@ -29,39 +18,61 @@ function segmentLine(line: LyricLine, maxWidth: number): LyricLine[] {
 
   while (start < text.length) {
     let end = start + maxWidth;
-
     if (end < text.length) {
-      // Break at last space before maxWidth to avoid splitting mid-word
       const breakAt = text.lastIndexOf(" ", end);
       if (breakAt > start) end = breakAt + 1;
     } else {
       end = text.length;
     }
-
     const segText = text.slice(start, end).trimEnd();
-
-    // Include chords whose offset falls within this segment; re-map offset
     const segChords = chords
       .filter((cp) => cp.offset >= start && cp.offset < end)
       .map((cp) => ({ ...cp, offset: cp.offset - start }));
-
     segments.push({ text: segText, chords: segChords });
-
-    // Advance past the break point, skipping leading spaces for next segment
     start = end;
     while (start < text.length && text[start] === " ") start++;
   }
-
   return segments;
 }
 
-function LineBlock({ line, sizeClass }: { line: LyricLine; sizeClass: string }) {
+function ChordRow({
+  chords,
+  sizeClass,
+  onChordClick,
+}: {
+  chords: { offset: number; chord: string }[];
+  sizeClass: string;
+  onChordClick?: (chord: string) => void;
+}) {
+  return (
+    <div className={`relative font-mono ${sizeClass} text-primary`} style={{ height: '1.5em' }}>
+      {chords.map(({ offset, chord }, i) => (
+        <span
+          key={i}
+          className="absolute cursor-pointer hover:underline"
+          style={{ left: `${offset}ch` }}
+          onClick={() => onChordClick?.(chord)}
+        >
+          {chord}
+        </span>
+      ))}
+    </div>
+  );
+}
+
+function LineBlock({
+  line,
+  sizeClass,
+  onChordClick,
+}: {
+  line: LyricLine;
+  sizeClass: string;
+  onChordClick?: (chord: string) => void;
+}) {
   return (
     <div className="leading-tight">
       {line.chords.length > 0 && (
-        <pre className={`text-primary ${sizeClass} font-mono whitespace-pre`}>
-          {buildChordRow(line.chords)}
-        </pre>
+        <ChordRow chords={line.chords} sizeClass={sizeClass} onChordClick={onChordClick} />
       )}
       {line.text && (
         <pre className={`text-foreground ${sizeClass} font-mono whitespace-pre`}>
@@ -72,7 +83,15 @@ function LineBlock({ line, sizeClass }: { line: LyricLine; sizeClass: string })
   );
 }
 
-function SectionBlock({ section, sizeClass }: { section: Section; sizeClass: string }) {
+function SectionBlock({
+  section,
+  sizeClass,
+  onChordClick,
+}: {
+  section: Section;
+  sizeClass: string;
+  onChordClick?: (chord: string) => void;
+}) {
   return (
     <div className="mb-6">
       {section.label && (
@@ -80,19 +99,19 @@ function SectionBlock({ section, sizeClass }: { section: Section; sizeClass: str
       )}
       {section.lines.flatMap((line, i) =>
         segmentLine(line, MAX_WIDTH).map((seg, j) => (
-          <LineBlock key={`${i}-${j}`} line={seg} sizeClass={sizeClass} />
+          <LineBlock key={`${i}-${j}`} line={seg} sizeClass={sizeClass} onChordClick={onChordClick} />
         ))
       )}
     </div>
   );
 }
 
-export function ChordChart({ sections, fontSize }: Props) {
+export function ChordChart({ sections, fontSize, onChordClick }: Props) {
   const sizeClass = { sm: 'text-sm', base: 'text-base', lg: 'text-lg' }[fontSize ?? 'sm'];
   return (
     <div className="px-4 py-3">
       {sections.map((section, i) => (
-        <SectionBlock key={i} section={section} sizeClass={sizeClass} />
+        <SectionBlock key={i} section={section} sizeClass={sizeClass} onChordClick={onChordClick} />
       ))}
     </div>
   );

app/app/lib/song-utils.ts

@@ -1,4 +1,4 @@
-import type { Song } from "./types";
+import type { Song, Section } from "./types";
 
 export function previewChords(song: Song): string[] {
   const seen = new Set<string>();
@@ -16,3 +16,20 @@ export function previewChords(song: Song): string[] {
   }
   return result.slice(0, 5);
 }
+
+/** All unique chord names in order of first appearance across all sections. */
+export function extractUniqueChords(sections: Section[]): string[] {
+  const seen = new Set<string>();
+  const result: string[] = [];
+  for (const section of sections) {
+    for (const line of section.lines) {
+      for (const cp of line.chords) {
+        if (!seen.has(cp.chord)) {
+          seen.add(cp.chord);
+          result.push(cp.chord);
+        }
+      }
+    }
+  }
+  return result;
+}