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import Link from 'next/link'
import {useRouter} from 'next/navigation'
import {useMemo, useRef, useState} from 'react'
import {detectKey, importChordsOverWords, parseChordPro} from '@/lib/chordpro'
import {abcPresets} from '@/lib/abc'
import {parseLength} from '@/lib/gig'
import ChartBody from '@/components/chart/ChartBody'
export type SongFormValues = {
title: string
writer: string
leadSinger: string
guitars: string
/** "3:12" */
length: string
keys: string
percussion: string
youtubeUrl: string
lyricsUrl: string
status: 'READY' | 'LEARNING'
notes: string
}
const FIELDS: [keyof SongFormValues, string, string?][] = [
['title', 'Title'],
['writer', 'Written by'],
['leadSinger', 'Lead singer'],
['guitars', 'Guitars', 'number'],
['length', 'Length (m:ss)'],
['keys', 'Keys'],
['percussion', 'Percussion'],
['youtubeUrl', 'Recording link', 'url'],
['lyricsUrl', 'Lyrics link', 'url'],
]
export function toPayload({length, ...v}: SongFormValues) {
const seconds = parseLength(length)
return {
...v,
// Unreadable ("3.12"): leave the saved length alone rather than erase it
...(seconds === undefined ? {} : {seconds}),
guitars: v.guitars.trim() === '' ? null : Number(v.guitars),
notes: v.notes.trim() || null,
}
}
export default function ChartEditor({
songId,
initialFields,
initialSource,
baseNumber,
demo = false,
}: {
songId: string
initialFields: SongFormValues
initialSource: string
baseNumber: number
/** The tour's sample song: everything works but Save */
demo?: boolean
}) {
const back = demo ? '/tour/song' : `/songs/${songId}`
const router = useRouter()
const [fields, setFields] = useState(initialFields)
const [source, setSource] = useState(initialSource)
const [note, setNote] = useState('')
const [tab, setTab] = useState<'edit' | 'preview'>('edit')
const [saving, setSaving] = useState(false)
const [error, setError] = useState<string | null>(null)
const chart = useMemo(() => parseChordPro(source), [source])
const chartChanged = source !== initialSource
const fieldsChanged = JSON.stringify(fields) !== JSON.stringify(initialFields)
const textarea = useRef<HTMLTextAreaElement>(null)
/** Drop a notation block in at the cursor (between lines), in the song's key. */
function insertNotation() {
const el = textarea.current
const at = el ? el.selectionStart : source.length
const lineStart = source.lastIndexOf('\n', at - 1) + 1
const pattern = abcPresets(detectKey(chart))[0].abc
const block = `{start_of_abc: Riff}\n${pattern}\n{end_of_abc}\n`
const next = source.slice(0, lineStart) + block + source.slice(lineStart)
setSource(next)
requestAnimationFrame(() => {
if (!el) return
el.focus()
// Select the music so it can be typed over straight away
const start = lineStart + block.indexOf('\n') + 1
el.setSelectionRange(start, start + pattern.length)
})
}
function convertPasted() {
// Turn a chords-over-lyrics paste (e.g. from a website) into ChordPro
const {source: converted} = importChordsOverWords(source, fields.title)
setSource(converted)
}
async function save() {
if (demo) return
setSaving(true)
setError(null)
try {
if (fieldsChanged) {
const r = await fetch(`/api/songs/${songId}`, {
method: 'PATCH',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify(toPayload(fields)),
})
if (!r.ok)
throw new Error(
'Could not save the song details. Check the links are full URLs.',
)
}
if (chartChanged) {
const r = await fetch(`/api/songs/${songId}/chart`, {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({source, note: note || null, baseNumber}),
})
if (r.status === 409) {
const {latest} = await r.json()
throw new Error(
`Someone saved version ${latest} while you were editing. Your text is still here: copy it, open the chart again, and re-apply your change.`,
)
}
if (!r.ok) throw new Error('Could not save the chart.')
}
router.push(`/songs/${songId}`)
router.refresh()
} catch (e) {
setError((e as Error).message)
setSaving(false)
}
}
const looksLikeChordsOverWords =
!/\[[^\]]+\]/.test(source.replace(/^\s*\[[^\]]+\]\s*$/gm, '')) &&
/^\s*[A-G][#b]?(m|maj|sus|dim|aug|add|\d)*(\s+[A-G][#b]?\S*)*\s*$/m.test(
source,
)
return (
<main className="mx-auto max-w-[1400px] px-4 pb-16 pt-4 md:px-7">
<Link
href={back}
className="text-sm text-muted no-underline hover:text-text"
>
‹ Back to chart
</Link>
<h1 className="mt-1 text-3xl font-extrabold">
Edit {initialFields.title}
</h1>
<section aria-labelledby="details-h" className="mt-5">
<h2
id="details-h"
className="mb-3 text-xs font-bold uppercase tracking-widest text-muted"
>
Song details
</h2>
<div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-4">
{FIELDS.map(([k, label, type]) => (
<label key={k} className="flex flex-col gap-1 text-sm text-muted">
{label}
<input
type={type ?? 'text'}
inputMode={type === 'number' ? 'numeric' : undefined}
value={fields[k]}
onChange={(e) => setFields({...fields, [k]: e.target.value})}
className="min-h-11 rounded-lg border border-line-2 bg-panel px-3 text-base text-text"
/>
</label>
))}
<fieldset className="flex flex-col gap-1 text-sm text-muted">
<legend className="mb-1">Status</legend>
<div className="flex overflow-hidden rounded-lg border border-line-2">
{(
[
['READY', 'Gig-ready'],
['LEARNING', 'Learning'],
] as const
).map(([v, label]) => (
<button
key={v}
type="button"
aria-pressed={fields.status === v}
onClick={() => setFields({...fields, status: v})}
className={`min-h-11 flex-1 ${fields.status === v ? 'bg-text font-semibold text-ink' : 'text-text'}`}
>
{label}
</button>
))}
</div>
</fieldset>
<label className="flex flex-col gap-1 text-sm text-muted sm:col-span-2 lg:col-span-3">
Notes (shown above the chart)
<textarea
value={fields.notes}
onChange={(e) => setFields({...fields, notes: e.target.value})}
rows={2}
className="rounded-lg border border-line-2 bg-panel px-3 py-2 text-base text-text"
/>
</label>
</div>
</section>
<section aria-labelledby="chart-h" className="mt-8">
<div className="mb-3 flex flex-wrap items-center gap-3">
<h2
id="chart-h"
className="text-xs font-bold uppercase tracking-widest text-muted"
>
Chart
</h2>
<div
role="tablist"
className="flex overflow-hidden rounded-lg border border-line-2 lg:hidden"
>
{(['edit', 'preview'] as const).map((t) => (
<button
key={t}
role="tab"
type="button"
aria-selected={tab === t}
onClick={() => setTab(t)}
className={`min-h-10 px-4 capitalize ${tab === t ? 'bg-text font-semibold text-ink' : ''}`}
>
{t}
</button>
))}
</div>
<span className="flex-1" />
<button
type="button"
onClick={insertNotation}
className="min-h-10 rounded-lg border border-line-2 px-3 text-sm font-semibold"
>
♪ Insert notation
</button>
{looksLikeChordsOverWords && (
<button
type="button"
onClick={convertPasted}
className="min-h-10 rounded-lg border border-amber px-3 text-sm font-semibold text-amber"
>
Convert chords-over-lyrics
</button>
)}
</div>
<div data-tour="editor" className="grid gap-6 lg:grid-cols-2">
<div className={tab === 'edit' ? '' : 'hidden lg:block'}>
<label htmlFor="chart-source" className="sr-only">
Chart (ChordPro)
</label>
<textarea
ref={textarea}
id="chart-source"
value={source}
onChange={(e) => setSource(e.target.value)}
spellCheck={false}
autoCapitalize="off"
autoCorrect="off"
className="h-[65vh] w-full rounded-lg border border-line-2 bg-panel-2 p-3 font-mono text-[15px] leading-relaxed text-text"
/>
<details className="mt-2 text-sm text-muted">
<summary className="cursor-pointer py-1">
How to write a chart
</summary>
<div className="mt-2 space-y-1 font-mono text-[13px]">
<p>Oh, I could [G]hide 'neath the [Am]wings</p>
<p>
{'{start_of_verse: Verse 1}'} … {'{end_of_verse}'}
</p>
<p>
{'{start_of_chorus: Chorus (x2)}'} … {'{end_of_chorus}'}
</p>
<p>
{'{start_of_intro: Intro}'} [G] [D7sus4] [G]{' '}
{'{end_of_intro}'}
</p>
<p>{'{comment: Micky counts it in}'}</p>
<p>
{'{start_of_abc: Horn riff}'} "G"B2 B2 B4 |
"C"B8 |] {'{end_of_abc}'}
</p>
<p className="font-sans">
Notation is ABC (abcnotation.com): letters are notes, numbers
are lengths, z is a rest, “G” is a chord, | is a bar. Write it
in the song’s key; it transposes with the chart. The preview
draws it as you type.
</p>
<p className="font-sans">
Or paste chords-above-lyrics text from anywhere and press
“Convert”.
</p>
</div>
</details>
</div>
<div
className={`rounded-lg border border-line p-4 text-[17px] ${tab === 'preview' ? '' : 'hidden lg:block'}`}
>
<ChartBody chart={chart} columns={false} notationOpen />
</div>
</div>
</section>
<div className="sticky bottom-[max(env(safe-area-inset-bottom),16px)] z-20 mt-6 flex flex-wrap items-center gap-2 rounded-xl border border-line-2 bg-panel p-2 sm:gap-3 sm:p-3">
<label className="flex min-w-0 flex-1 basis-64 items-center gap-2 text-sm text-muted">
<span className="hidden shrink-0 sm:inline">What changed?</span>
<input
value={note}
onChange={(e) => setNote(e.target.value)}
placeholder="What changed? e.g. added the C under “to a”"
aria-label="What changed?"
disabled={!chartChanged}
className="min-h-11 min-w-0 flex-1 rounded-lg border border-line-2 bg-ink px-3 text-base text-text disabled:opacity-50"
/>
</label>
<Link
href={back}
className="inline-flex min-h-11 items-center px-3 text-muted"
>
Cancel
</Link>
<button
type="button"
onClick={save}
disabled={demo || saving || (!chartChanged && !fieldsChanged)}
title={demo ? 'The tour’s sample: nothing saves' : undefined}
className="min-h-11 rounded-lg bg-accent px-5 font-bold text-on-accent disabled:opacity-40"
>
{saving ? 'Saving…' : 'Save'}
</button>
{error && (
<p role="alert" className="basis-full text-sm text-bad">
{error}
</p>
)}
</div>
</main>
)
}
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