Descarga de capítulos sueltos: rango o selección en la lista

Las descargas tienen modo 'all' (manga entero, también lo nuevo) o 'some' (solo
los capítulos pedidos, en download_wanted). El selector de capítulos se comparte
con el reescalado HD.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/features.js

@@ -177,7 +177,8 @@ export function setupFeatures({ db, fetchMangaFull, enqueueDownload, downloadInf
     }
     // Autodescarga: si el manga ya tiene copia local, bajar también lo nuevo.
     const dl = anyNew && downloadInfo(mangaId)
-    if (dl && !['queued', 'downloading'].includes(dl.status)) enqueueDownload(mangaId, dl.title, dl.lang)
+    // Solo si se baja el manga entero; con capítulos sueltos, lo nuevo no se descarga solo.
+    if (dl && dl.scope !== 'some' && !['queued', 'downloading'].includes(dl.status)) enqueueDownload(mangaId, dl.title, dl.lang)
     return anyNew
   }
 

app/public/app.js

@@ -304,7 +304,6 @@ async function viewManga(id, langOverride) {
   const lang = langOverride || store.get(`lang:${id}`, me.lang)
   const { manga, chapters, reads, progress, chapterLangs, offline, downloaded, download, upscale, following, newKeys = [] } = await api(`/api/manga/${id}?lang=${encodeURIComponent(lang)}`)
   const dlSet = new Set(downloaded)
-  let hdSet = new Set(upscale?.chapters || []), hdJobs = upscale?.jobs || {}
   const newSet = new Set(newKeys.map(String))
   let isFollowing = following
   const readMap = new Map(reads.map(r => [r.chapter_id, r]))
@@ -354,34 +353,182 @@ async function viewManga(id, langOverride) {
     ${chapterLangs.length ? `Disponibles en: ${chapterLangs.map(l => `<a class="tag" href="#" data-lang="${esc(l)}">${esc(LANGS[l] || l)}</a>`).join(' ')}` : 'No hay capítulos en ningún idioma.'}</p>`}
   <div id="selbar" hidden></div>`
 
+  const secHead = (ic, title, status) => `<div class="psec-head"><div class="psec-title">${icon(ic)} ${title}</div>${status ? `<div class="psec-status muted">${status}</div>` : ''}</div>`
+  const plural = (n, w) => `${n} ${w}${n === 1 ? '' : 's'}`
+  const fmtDur = sec => sec < 90 ? '≈ 1 min' : sec < 3600 ? `≈ ${Math.round(sec / 60)} min` : `≈ ${Math.floor(sec / 3600)} h ${Math.round((sec % 3600) / 60)} min`
+
+  // --- Selector de capítulos compartido por "Copia local" (kind 'dl') y "Reescalado HD" (kind 'hd'):
+  // todo lo pendiente (solo HD), un rango o una selección hecha en la lista de abajo.
+  let wantedSet = new Set(download?.wanted || [])
+  let hdSet = new Set(upscale?.chapters || []), hdJobs = upscale?.jobs || {}
+  let hdInfo = upscale
+  let sel = null // null | { kind: 'dl' | 'hd', mode: 'pending' | 'range' | 'pick' }
+  const picked = new Set()
+  let lastPick = null
+  const KINDS = {
+    dl: {
+      verb: 'Descargar', ic: 'download', modes: { range: 'Rango', pick: 'Elegir' },
+      // Sin descargar y sin estar ya en cola.
+      candidates: () => chapters.filter(c => !dlSet.has(c.id) && !wantedSet.has(c.id)),
+      rangeBase: () => chapters,
+      mark: c => (dlSet.has(c.id) ? ' (descargado)' : ''),
+      summary: ids => {
+        const pages = ids.reduce((n, cid) => n + (chapters.find(c => c.id === cid)?.pages || 0), 0)
+        return plural(ids.length, 'capítulo') + (pages ? ` · ${pages} págs.` : '')
+      },
+      offTitle: c => (dlSet.has(c.id) ? 'Ya descargado' : 'Ya está en cola'),
+      run: async ids => {
+        renderDl(await api(`/api/download/${id}`, { method: 'POST', body: { lang, title: manga.title, chapterIds: ids } }))
+        toast(`${plural(ids.length, 'capítulo')} en cola de descarga`)
+      },
+    },
+    hd: {
+      verb: 'Reescalar', ic: 'sparkles', modes: { pending: 'Pendientes', range: 'Rango', pick: 'Elegir' },
+      // Descargados, sin HD y sin estar ya en cola (los fallidos sí, para reintentar).
+      candidates: () => chapters.filter(c => dlSet.has(c.id) && !hdSet.has(c.id) && (!hdJobs[c.id] || hdJobs[c.id] === 'error')),
+      rangeBase: () => chapters.filter(c => dlSet.has(c.id)),
+      mark: c => (hdSet.has(c.id) ? ' (HD)' : ''),
+      summary: ids => {
+        const pages = ids.reduce((n, cid) => n + (hdInfo?.pages?.[cid] || 0), 0)
+        return `${plural(ids.length, 'capítulo')} · ${pages} págs. · ${fmtDur(pages * (hdInfo?.secPerPage || 13))}`
+      },
+      offTitle: c => (!dlSet.has(c.id) ? 'No está descargado' : 'Ya está en HD o en cola'),
+      run: async ids => {
+        renderHd(await api(`/api/upscale/${id}`, { method: 'POST', body: { chapterIds: ids } }))
+        toast(`${plural(ids.length, 'capítulo')} en cola para HD`)
+      },
+    },
+  }
+  const selIds = () => {
+    if (!sel) return []
+    const K = KINDS[sel.kind]
+    const cand = K.candidates()
+    if (sel.mode === 'pending') return cand.map(c => c.id)
+    if (sel.mode === 'pick') return cand.filter(c => picked.has(c.id)).map(c => c.id)
+    const base = K.rangeBase()
+    let a = base.findIndex(c => c.id === $('#selfrom')?.value), b = base.findIndex(c => c.id === $('#selto')?.value)
+    if (a < 0 || b < 0) return []
+    if (a > b) [a, b] = [b, a]
+    const inRange = new Set(base.slice(a, b + 1).map(c => c.id))
+    return cand.filter(c => inRange.has(c.id)).map(c => c.id)
+  }
+  const updateSummary = () => {
+    const ids = selIds()
+    const K = sel && KINDS[sel.kind]
+    if ($('#selsum')) $('#selsum').textContent = ids.length ? K.summary(ids) : sel?.mode === 'pick' ? 'Marca capítulos en la lista de abajo.' : 'No hay capítulos pendientes en esa selección.'
+    if ($('#selgo')) $('#selgo').disabled = !ids.length
+    const bar = $('#selbar')
+    if (!bar) return
+    bar.hidden = sel?.mode !== 'pick'
+    if (sel?.mode !== 'pick') return
+    bar.innerHTML = `<span>${ids.length ? K.summary(ids) : 'Ningún capítulo marcado'}</span>
+      <button class="btn small primary" id="selrun" ${ids.length ? '' : 'disabled'}>${icon(K.ic)} ${K.verb}</button>
+      <button class="btn small" id="selexit" title="Salir de la selección">${icon('x')}</button>`
+    $('#selrun').addEventListener('click', runSel)
+    $('#selexit').addEventListener('click', () => setSel(null))
+  }
+  async function runSel() {
+    const ids = selIds()
+    if (!ids.length) return
+    const K = KINDS[sel.kind]
+    try {
+      if (sel.kind === 'hd' && sel.mode === 'pending' && $('#hdautoform') && $('#hdautoform').checked !== !!hdInfo?.auto) {
+        await api(`/api/upscale/${id}/auto`, { method: 'POST', body: { auto: $('#hdautoform').checked } }).catch(() => {})
+      }
+      picked.clear()
+      setSel(null)
+      await K.run(ids)
+    } catch (err) { toast(err.message) }
+  }
+  function setSel(next) {
+    const wasPick = sel?.mode === 'pick', prevKind = sel?.kind
+    if (next?.kind !== prevKind) picked.clear()
+    sel = next
+    if (prevKind && prevKind !== next?.kind) renderSelForm(prevKind) // cerrar el otro formulario
+    if (next) renderSelForm(next.kind)
+    if (wasPick !== (next?.mode === 'pick') || (wasPick && prevKind !== next?.kind)) renderList()
+    $('#dlopen')?.classList.toggle('on', sel?.kind === 'dl')
+    $('#hdopen')?.classList.toggle('on', sel?.kind === 'hd')
+    updateSummary()
+  }
+  function renderSelForm(kind) {
+    const box = $(`#${kind}form`)
+    if (!box) return
+    const open = sel?.kind === kind
+    box.hidden = !open
+    if (!open) { box.innerHTML = ''; return }
+    const K = KINDS[kind]
+    const base = K.rangeBase(), cand = K.candidates()
+    const opt = (c, on) => `<option value="${c.id}" ${on ? 'selected' : ''}>${esc(c.num ? `Cap. ${c.num}` : 'Oneshot')}${K.mark(c)}</option>`
+    const from = cand[0] || base[0], to = cand[Math.min(cand.length, 10) - 1] || base.at(-1)
+    box.innerHTML = `
+      <div class="seg" role="tablist">${Object.entries(K.modes).map(([m, label]) => `<button data-sm="${m}" class="${sel.mode === m ? 'on' : ''}">${label}</button>`).join('')}</div>
+      ${sel.mode === 'range' ? `<div class="row range"><label>Desde <select id="selfrom">${base.map(c => opt(c, c === from)).join('')}</select></label>
+        <label>hasta <select id="selto">${base.map(c => opt(c, c === to)).join('')}</select></label></div>` : ''}
+      ${sel.mode === 'pick' ? '<div class="note muted">Marca los capítulos en la lista de abajo. Mayús + clic marca un tramo entero.</div>' : ''}
+      ${sel.mode === 'pending' ? `<div class="note muted">Todos los capítulos descargados que aún no están en HD.</div>
+        <label class="check"><input type="checkbox" id="hdautoform" ${hdInfo?.auto ? 'checked' : ''}> Reescalar también los que se descarguen en el futuro</label>` : ''}
+      <div class="row"><b id="selsum" class="sum"></b></div>
+      <div class="psec-actions"><button class="btn small primary" id="selgo">${icon(K.ic)} ${K.verb}</button><button class="btn small" id="selclose">Cerrar</button></div>`
+    box.querySelectorAll('[data-sm]').forEach(b => b.addEventListener('click', () => setSel({ kind, mode: b.dataset.sm })))
+    $('#selfrom')?.addEventListener('change', updateSummary)
+    $('#selto')?.addEventListener('change', updateSummary)
+    $('#selclose').addEventListener('click', () => setSel(null))
+    $('#selgo').addEventListener('click', runSel)
+  }
+  // Tras un sondeo: repintar lo que dependa de los conjuntos y cerrar el selector si ya no queda nada.
+  const refreshSel = () => {
+    renderList()
+    if (sel && sel.mode !== 'pick') renderSelForm(sel.kind)
+    if (sel && !KINDS[sel.kind].candidates().length) setSel(null)
+    else updateSummary()
+  }
+
   // --- Copia local (descarga) con sondeo del progreso mientras está activa.
   let dlTimer = null
-  const secHead = (ic, title, status) => `<div class="psec-head"><div class="psec-title">${icon(ic)} ${title}</div>${status ? `<div class="psec-status muted">${status}</div>` : ''}</div>`
   const renderDl = d => {
     const box = $('#dl')
     if (!box) return
     const active = d && DL_ACTIVE.includes(d.status)
+    const some = d?.scope === 'some'
     const partial = d && d.done < d.total
     const bar = d && (active || partial) ? `<div class="bar dlbar"><i style="width:${downloadPct(d).toFixed(1)}%"></i></div>` : ''
+    const canPick = !offline && chapters.some(c => !dlSet.has(c.id) && !wantedSet.has(c.id) && !(d?.wanted || []).includes(c.id))
+    const pickBtn = label => (canPick ? `<button class="btn small ${sel?.kind === 'dl' ? 'on' : ''}" id="dlopen">${icon('download')} ${label}</button>` : '')
     const delBtn = d ? `<button class="btn small danger push" id="dldel">${icon('trash')} Eliminar copia${d.size ? ` · ${fmtSize(d.size)}` : ''}</button>` : ''
     let status = '', body = '', actions = ''
     if (!d) {
-      body = '<div class="note muted">Guarda los capítulos en CBZ en el servidor para leerlos sin conexión (y poder reescalarlos a HD).</div>'
+      body = '<div class="note muted">Guarda capítulos en CBZ en el servidor para leerlos sin conexión (y poder reescalarlos a HD). Puedes bajar el manga entero o solo algunos capítulos.</div>'
-      actions = `<button class="btn small" id="dlgo">${icon('download')} Descargar manga</button>`
+      actions = `<button class="btn small" id="dlall">${icon('download')} Descargar todo</button>${pickBtn('Elegir capítulos…')}`
     } else if (active) {
       status = `${downloadLabel(d)} · ${Math.floor(downloadPct(d))}%`
       body = `${bar}<div class="note muted">${downloadDetail(d)}</div>`
-      actions = `<button class="btn small" id="dlcancel">${icon('stop')} Cancelar</button>${delBtn}`
+      actions = `${pickBtn('Añadir capítulos…')}<button class="btn small" id="dlcancel">${icon('stop')} Cancelar</button>${delBtn}`
     } else {
-      status = d.status === 'done' ? `${icon('check')} ${d.done} capítulos${d.size ? ` · ${fmtSize(d.size)}` : ''}` : downloadLabel(d)
+      const have = dlSet.size
+      status = d.status === 'done'
+        ? `${icon('check')} ${some ? `${have} de ${chapters.length}` : have} capítulos${d.size ? ` · ${fmtSize(d.size)}` : ''}`
+        : downloadLabel(d)
       body = bar + (d.status === 'error' && d.error ? `<div class="error note">${esc(d.error)}</div>` : '')
-      actions = `<button class="btn small" id="dlgo" title="Descarga los capítulos que falten">${icon(d.status === 'cancelled' ? 'download' : 'refresh')} ${d.status === 'error' ? 'Reintentar' : d.status === 'cancelled' ? 'Continuar descarga' : 'Buscar capítulos nuevos'}</button>${delBtn}`
+        + (some && d.status === 'done' ? '<div class="note muted">Solo capítulos elegidos: los nuevos no se descargan solos.</div>' : '')
+      const resume = d.status === 'error' ? 'Reintentar' : d.status === 'cancelled' ? 'Continuar descarga' : null
+      actions = some
+        ? `${resume ? `<button class="btn small" id="dlgo">${icon('refresh')} ${resume}</button>` : ''}${pickBtn('Descargar más…')}<button class="btn small" id="dlall" title="Bajar también todos los capítulos que falten y, en adelante, los nuevos">${icon('download')} Descargar todo</button>${delBtn}`
+        : `<button class="btn small" id="dlgo" title="Descarga los capítulos que falten">${icon(resume ? 'download' : 'refresh')} ${resume || 'Buscar capítulos nuevos'}</button>${delBtn}`
     }
-    box.innerHTML = secHead('download', 'Copia local', status) + body + (offline ? '' : `<div class="psec-actions">${actions}</div>`)
+    if (!$('#dltop')) box.innerHTML = '<div id="dltop" class="psec-grid"></div><div id="dlform" class="hdform" hidden></div>'
+    $('#dltop').innerHTML = secHead('download', 'Copia local', status) + body + (offline ? '' : `<div class="psec-actions">${actions}</div>`)
     $('#dlgo')?.addEventListener('click', async () => {
+      // Reanudar respeta el modo (todo o capítulos elegidos).
+      renderDl(await api(`/api/download/${id}`, { method: 'POST', body: { lang, title: manga.title, ...(some ? { chapterIds: d.wanted?.length ? d.wanted : [] } : {}) } }).catch(err => (toast(err.message), d)))
+    })
+    $('#dlall')?.addEventListener('click', async () => {
+      const missing = chapters.filter(c => !dlSet.has(c.id)).length
+      if (d && !confirm(`¿Descargar todo «${manga.title}»?\nSe bajarán ${plural(missing, 'capítulo')} que faltan y, en adelante, los nuevos.`)) return
       renderDl(await api(`/api/download/${id}`, { method: 'POST', body: { lang, title: manga.title } }))
       toast(`Descargando en mangas/${manga.title}`)
     })
+    $('#dlopen')?.addEventListener('click', () => setSel(sel?.kind === 'dl' ? null : { kind: 'dl', mode: 'range' }))
     $('#dlcancel')?.addEventListener('click', async () => renderDl(await api(`/api/download/${id}/cancel`, { method: 'POST' })))
     $('#dldel')?.addEventListener('click', async () => {
       if (!confirm(`¿Eliminar la copia local de «${manga.title}»?\nSe borrará la carpeta mangas/${d.folder}${d.size ? ` (${fmtSize(d.size)})` : ''}, incluida la versión HD.\nTu historial de lectura no se toca.`)) return
@@ -389,6 +536,9 @@ async function viewManga(id, langOverride) {
       toast('Copia local eliminada')
       viewManga(id, langOverride)
     })
+    const wantedBefore = wantedSet.size
+    wantedSet = new Set(d?.wanted || [])
+    if (wantedSet.size !== wantedBefore) refreshSel()
     clearTimeout(dlTimer)
     if (active) dlTimer = setTimeout(async () => {
       const next = await api(`/api/download/${id}`).catch(() => d)
@@ -398,103 +548,14 @@ async function viewManga(id, langOverride) {
         fresh?.downloaded.forEach(x => dlSet.add(x))
         if (fresh?.download) next.size = fresh.download.size
         if (fresh?.upscale) renderHd(fresh.upscale)
-        renderList()
+        refreshSel()
       }
       renderDl(next)
     }, 2000)
   }
 
-  // --- Reescalado HD: todo lo pendiente, un rango o una selección hecha en la lista.
+  // --- Reescalado HD de lo descargado.
   let hdTimer = null
-  let hdInfo = upscale
-  let hdForm = null // null (cerrado) | 'pending' | 'range' | 'pick'
-  const picked = new Set()
-  let lastPick = null
-  const fmtDur = sec => sec < 90 ? '≈ 1 min' : sec < 3600 ? `≈ ${Math.round(sec / 60)} min` : `≈ ${Math.floor(sec / 3600)} h ${Math.round((sec % 3600) / 60)} min`
-  // Descargados, sin HD y sin estar ya en cola (los fallidos sí, para reintentar). En orden de lectura.
-  const hdCandidates = () => chapters.filter(c => dlSet.has(c.id) && !hdSet.has(c.id) && (!hdJobs[c.id] || hdJobs[c.id] === 'error'))
-  const estimate = ids => {
-    const pages = ids.reduce((n, cid) => n + (hdInfo?.pages?.[cid] || 0), 0)
-    return `${ids.length} capítulo${ids.length === 1 ? '' : 's'} · ${pages} págs. · ${fmtDur(pages * (hdInfo?.secPerPage || 13))}`
-  }
-  const formIds = () => {
-    const cand = hdCandidates()
-    if (hdForm === 'pending') return cand.map(c => c.id)
-    if (hdForm === 'pick') return cand.filter(c => picked.has(c.id)).map(c => c.id)
-    if (hdForm === 'range') {
-      const dls = chapters.filter(c => dlSet.has(c.id))
-      let a = dls.findIndex(c => c.id === $('#hdfrom')?.value), b = dls.findIndex(c => c.id === $('#hdto')?.value)
-      if (a < 0 || b < 0) return []
-      if (a > b) [a, b] = [b, a]
-      const inRange = new Set(dls.slice(a, b + 1).map(c => c.id))
-      return cand.filter(c => inRange.has(c.id)).map(c => c.id)
-    }
-    return []
-  }
-  const updateSummary = () => {
-    const ids = formIds()
-    const sum = $('#hdsum')
-    if (sum) sum.textContent = ids.length ? estimate(ids) : hdForm === 'pick' ? 'Marca capítulos en la lista de abajo.' : 'No hay capítulos pendientes en esa selección.'
-    if ($('#hdrun')) $('#hdrun').disabled = !ids.length
-    const bar = $('#selbar')
-    if (bar) {
-      bar.hidden = hdForm !== 'pick'
-      if (hdForm === 'pick') bar.innerHTML = `<span>${ids.length ? estimate(ids) : 'Ningún capítulo marcado'}</span>
-        <button class="btn small primary" id="selrun" ${ids.length ? '' : 'disabled'}>${icon('sparkles')} Reescalar</button>
-        <button class="btn small" id="selexit" title="Salir de la selección">${icon('x')}</button>`
-      $('#selrun')?.addEventListener('click', runHd)
-      $('#selexit')?.addEventListener('click', () => setForm(null))
-    }
-  }
-  async function runHd() {
-    const ids = formIds()
-    if (!ids.length) return
-    try {
-      const u = await api(`/api/upscale/${id}`, { method: 'POST', body: { chapterIds: ids } })
-      toast(`${ids.length} capítulo${ids.length === 1 ? '' : 's'} en cola para HD`)
-      picked.clear()
-      setForm(null)
-      renderHd(u)
-    } catch (err) { toast(err.message) }
-  }
-  function setForm(mode) {
-    const wasPick = hdForm === 'pick'
-    hdForm = mode
-    renderHdForm()
-    if (wasPick !== (mode === 'pick')) renderList()
-    updateSummary()
-  }
-  function renderHdForm() {
-    const box = $('#hdform')
-    if (!box) return
-    box.hidden = !hdForm
-    if (!hdForm) { box.innerHTML = ''; return }
-    const dls = chapters.filter(c => dlSet.has(c.id))
-    const cand = hdCandidates()
-    const opt = (c, sel) => `<option value="${c.id}" ${sel ? 'selected' : ''}>${esc(c.num ? `Cap. ${c.num}` : 'Oneshot')}${hdSet.has(c.id) ? ' (HD)' : ''}</option>`
-    const from = cand[0] || dls[0], to = cand[Math.min(cand.length, 10) - 1] || dls.at(-1)
-    box.innerHTML = `
-      <div class="seg" role="tablist">
-        <button data-hm="pending" class="${hdForm === 'pending' ? 'on' : ''}">Pendientes</button>
-        <button data-hm="range" class="${hdForm === 'range' ? 'on' : ''}">Rango</button>
-        <button data-hm="pick" class="${hdForm === 'pick' ? 'on' : ''}">Elegir</button>
-      </div>
-      ${hdForm === 'range' ? `<div class="row range"><label>Desde <select id="hdfrom">${dls.map(c => opt(c, c === from)).join('')}</select></label>
-        <label>hasta <select id="hdto">${dls.map(c => opt(c, c === to)).join('')}</select></label></div>` : ''}
-      ${hdForm === 'pick' ? '<div class="note muted">Marca los capítulos en la lista de abajo. Mayús + clic marca un tramo entero.</div>' : ''}
-      ${hdForm === 'pending' ? `<div class="note muted">Todos los capítulos descargados que aún no están en HD.</div>
-        <label class="check"><input type="checkbox" id="hdautoform" ${hdInfo?.auto ? 'checked' : ''}> Reescalar también los que se descarguen en el futuro</label>` : ''}
-      <div class="row"><b id="hdsum" class="sum"></b></div>
-      <div class="psec-actions"><button class="btn small primary" id="hdrun">${icon('sparkles')} Reescalar</button><button class="btn small" id="hdclose">Cerrar</button></div>`
-    box.querySelectorAll('[data-hm]').forEach(b => b.addEventListener('click', () => setForm(b.dataset.hm)))
-    $('#hdfrom')?.addEventListener('change', updateSummary)
-    $('#hdto')?.addEventListener('change', updateSummary)
-    $('#hdclose').addEventListener('click', () => setForm(null))
-    $('#hdrun').addEventListener('click', async () => {
-      if (hdForm === 'pending' && $('#hdautoform')?.checked !== !!hdInfo?.auto) await api(`/api/upscale/${id}/auto`, { method: 'POST', body: { auto: $('#hdautoform').checked } }).catch(() => {})
-      runHd()
-    })
-  }
   const renderHd = u => {
     const box = $('#hd')
     if (!box) return
@@ -517,17 +578,17 @@ async function viewManga(id, langOverride) {
         body = `<div class="note muted">Mejora la nitidez con IA (Real-ESRGAN ×2). Unos ${u.secPerPage} s por página; el original no se toca.</div>`
       }
       if (u.error) body += `<div class="error note">Falló algún capítulo: ${esc(u.error)}</div>`
-      const canAdd = hdCandidates().length > 0
+      const canAdd = KINDS.hd.candidates().length > 0
       const actions = [
-        canAdd ? `<button class="btn small ${hdForm ? 'on' : ''}" id="hdopen" aria-expanded="${!!hdForm}">${icon('sparkles')} ${active ? 'Añadir capítulos…' : 'Reescalar…'}</button>` : '',
+        canAdd ? `<button class="btn small ${sel?.kind === 'hd' ? 'on' : ''}" id="hdopen">${icon('sparkles')} ${active ? 'Añadir capítulos…' : 'Reescalar…'}</button>` : '',
         active ? `<button class="btn small" id="hdcancel">${icon('stop')} Detener</button>` : '',
         u.hd ? `<button class="btn small danger push" id="hddel">${icon('trash')} Quitar HD</button>` : '',
       ].join('')
-      // El formulario se conserva entre sondeos: solo se repinta la parte de arriba.
+      // Los formularios se conservan entre sondeos: solo se repinta la parte de arriba.
       if (!$('#hdtop')) box.innerHTML = '<div id="hdtop" class="psec-grid"></div><div id="hdform" class="hdform" hidden></div>'
       $('#hdtop').innerHTML = secHead('sparkles', 'Reescalado HD', status) + body + (actions ? `<div class="psec-actions">${actions}</div>` : '')
         + (u.auto ? '<div class="note muted">Los capítulos que se descarguen también se reescalan.</div>' : '')
-      $('#hdopen')?.addEventListener('click', () => setForm(hdForm ? null : 'pending'))
+      $('#hdopen')?.addEventListener('click', () => setSel(sel?.kind === 'hd' ? null : { kind: 'hd', mode: 'pending' }))
       $('#hdcancel')?.addEventListener('click', async () => {
         if (!confirm('¿Detener el reescalado?\nSe vacía la cola de este manga; lo ya reescalado se queda.')) return
         renderHd(await api(`/api/upscale/${id}/cancel`, { method: 'POST' }))
@@ -541,10 +602,8 @@ async function viewManga(id, langOverride) {
     }
     const changed = (u?.chapters?.length ?? 0) !== hdSet.size || JSON.stringify(u?.jobs || {}) !== JSON.stringify(hdJobs)
     hdSet = new Set(u?.chapters || []); hdJobs = u?.jobs || {}
-    if (changed) { renderList(); if (hdForm && hdForm !== 'pick') renderHdForm(); updateSummary() }
+    if (changed) refreshSel()
-    if (hdForm && !hdCandidates().length) setForm(null)
   }
-  cleanup = () => { clearTimeout(dlTimer); clearTimeout(hdTimer) }
 
   const renderFollow = () => {
     const b = $('#follow')
@@ -576,21 +635,22 @@ async function viewManga(id, langOverride) {
   const ul = $('.chapters', app)
   let desc = store.get('chapterOrderDesc', true)
   const chapMeta = (c, r, done) => (newSet.has(String(c.num ?? c.id)) ? '<span class="badge">NUEVO</span> ' : '')
-    + (dlSet.has(c.id) ? `<span title="Descargado">${icon('download')}</span> ` : '')
+    + (dlSet.has(c.id) ? `<span title="Descargado">${icon('download')}</span> ` : wantedSet.has(c.id) ? `<span class="queued" title="En cola de descarga">${icon('download')}…</span> ` : '')
     + (hdSet.has(c.id) ? '<span class="hd" title="Reescalado a HD">HD</span> '
       : hdJobs[c.id] ? `<span class="hd pending" title="${hdJobs[c.id] === 'error' ? 'Falló el reescalado' : 'En cola para HD'}">HD${hdJobs[c.id] === 'error' ? '!' : '…'}</span> ` : '')
     + (r ? (done ? 'Leído' : `pág. ${r.page + 1}/${r.total_pages}`) : esc(c.group))
   function renderList() {
     if (!ul) return
     const list = desc ? [...chapters].reverse() : chapters
-    const pickable = new Set(hdForm === 'pick' ? hdCandidates().map(c => c.id) : [])
+    const picking = sel?.mode === 'pick'
-    ul.classList.toggle('picking', hdForm === 'pick')
+    const pickable = new Set(picking ? KINDS[sel.kind].candidates().map(c => c.id) : [])
+    ul.classList.toggle('picking', picking)
     ul.innerHTML = list.map((c, i) => {
       const r = readMap.get(c.id)
       const done = r && r.total_pages && r.page >= r.total_pages - 1
-      if (hdForm === 'pick') {
+      if (picking) {
         const ok = pickable.has(c.id)
-        return `<li><label class="pick ${ok ? '' : 'off'}" title="${ok ? '' : dlSet.has(c.id) ? 'Ya está en HD o en cola' : 'No está descargado'}">
+        return `<li><label class="pick ${ok ? '' : 'off'}" title="${ok ? '' : KINDS[sel.kind].offTitle(c)}">
           <input type="checkbox" data-i="${i}" data-cid="${c.id}" ${ok ? '' : 'disabled'} ${picked.has(c.id) ? 'checked' : ''}>
           <span class="t">${esc(chapLabel(c))}</span><span class="meta">${chapMeta(c, r, done)}</span></label></li>`
       }
@@ -598,7 +658,7 @@ async function viewManga(id, langOverride) {
       return `<li><a class="${cls}" href="${readUrl(id, c.id, r && !done ? r.page : (done ? 0 : null))}"><span>${esc(chapLabel(c))}</span><span class="meta">${chapMeta(c, r, done)}</span></a></li>`
     }).join('')
   }
-  // Selección para HD (Mayús + clic marca el tramo desde el último marcado).
+  // Selección en la lista (Mayús + clic marca el tramo desde el último marcado).
   ul?.addEventListener('click', e => {
     const box = e.target.closest('input[data-cid]')
     if (!box) return
@@ -613,8 +673,8 @@ async function viewManga(id, langOverride) {
     lastPick = i
     updateSummary()
   })
-  renderDl(download)
   renderList()
+  renderDl(download)
   renderHd(upscale)
   $('#order')?.addEventListener('click', () => { desc = !desc; lastPick = null; store.set('chapterOrderDesc', desc); renderList() })
   $('#lang')?.addEventListener('change', e => { store.set(`lang:${id}`, e.target.value); viewManga(id, e.target.value) })

app/public/style.css

@@ -160,6 +160,7 @@ a.tag:hover, .tag.on { background: var(--accent); color: var(--accent-ink); }
 
 /* Insignias y botón Seguir */
 .hd { display: inline-block; font-size: .65rem; font-weight: 800; letter-spacing: .03em; padding: 0 5px; border-radius: 4px; border: 1px solid var(--accent); color: var(--accent); vertical-align: middle; }
+.chapters .meta .queued { opacity: .55; }
 .hd.pending { border-style: dashed; color: var(--muted); border-color: var(--muted); }
 .badge { display: inline-block; font-size: .72rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); vertical-align: middle; }
 .btn.on { border-color: var(--accent); color: var(--accent); }

app/server.js

@@ -108,6 +108,13 @@ CREATE TABLE IF NOT EXISTS downloaded_chapters (
 CREATE INDEX IF NOT EXISTS idx_dlch_manga ON downloaded_chapters(manga_id);
 `)
 db.prepare('DELETE FROM sessions WHERE expires_at < ?').run(Date.now())
+// Descargas parciales: scope 'some' baja solo los capítulos pedidos (download_wanted); 'all', el manga entero.
+if (!db.prepare('PRAGMA table_info(downloads)').all().some(c => c.name === 'scope')) db.exec("ALTER TABLE downloads ADD COLUMN scope TEXT NOT NULL DEFAULT 'all'")
+db.exec(`CREATE TABLE IF NOT EXISTS download_wanted (
+  chapter_id TEXT PRIMARY KEY,
+  manga_id TEXT NOT NULL REFERENCES downloads(manga_id) ON DELETE CASCADE,
+  created_at INTEGER NOT NULL
+)`)
 // finished_at: cuándo se terminó la última página del último capítulo disponible (null = en curso).
 if (!db.prepare('PRAGMA table_info(progress)').all().some(c => c.name === 'finished_at')) db.exec('ALTER TABLE progress ADD COLUMN finished_at INTEGER')
 
@@ -488,6 +495,7 @@ async function downloadChapter(dl, manga, c, dir) {
   }
   db.prepare(`INSERT OR REPLACE INTO downloaded_chapters (chapter_id, manga_id, num, title, file, pages, created_at) VALUES (?, ?, ?, ?, ?, ?, ?)`)
     .run(c.id, dl.manga_id, c.num ?? null, c.title || '', file, urls.length, Date.now())
+  db.prepare('DELETE FROM download_wanted WHERE chapter_id = ?').run(c.id)
   upscale.onChapterDownloaded(dl.manga_id, c.id)
 }
 
@@ -532,8 +540,14 @@ async function runDownload(dl) {
   }
   const have = new Set(db.prepare('SELECT chapter_id, file FROM downloaded_chapters WHERE manga_id = ?').all(dl.manga_id)
     .filter(r => fs.existsSync(path.join(dir, r.file))).map(r => r.chapter_id))
-  const pending = chapters.filter(c => !have.has(c.id))
+  let pending = chapters.filter(c => !have.has(c.id))
-  dlUpdate(dl.manga_id, { status: 'downloading', title: manga.title, meta: JSON.stringify({ manga, chapters }), total: chapters.length, done: chapters.length - pending.length, failed: 0, error: null })
+  let total = chapters.length
+  if (dl.scope === 'some') {
+    const wanted = new Set(db.prepare('SELECT chapter_id FROM download_wanted WHERE manga_id = ?').all(dl.manga_id).map(r => r.chapter_id))
+    pending = pending.filter(c => wanted.has(c.id))
+    total = have.size + pending.length
+  }
+  dlUpdate(dl.manga_id, { status: 'downloading', title: manga.title, meta: JSON.stringify({ manga, chapters }), total, done: total - pending.length, failed: 0, error: null })
   let failed = 0
   let lastError = null
   for (const c of pending) {
@@ -567,31 +581,44 @@ async function pumpDownloads() {
     for (;;) {
       const dl = db.prepare("SELECT * FROM downloads WHERE status IN ('downloading', 'queued') ORDER BY status = 'downloading' DESC, created_at LIMIT 1").get()
       if (!dl) break
+      requeue.delete(dl.manga_id)
       try {
         await runDownload(dl)
       } catch (e) {
         console.error('Descarga fallida', dl.manga_id, e)
         if (!isCancelled(dl.manga_id)) dlUpdate(dl.manga_id, { status: 'error', error: e.message })
       }
+      // Pidieron más capítulos mientras se bajaba: otra vuelta.
+      if (requeue.delete(dl.manga_id) && !isCancelled(dl.manga_id)) dlUpdate(dl.manga_id, { status: 'queued' })
     }
   } finally {
     pumping = false
   }
 }
 
-function enqueueDownload(mangaId, title, lang) {
+// chapterIds: solo esos capítulos (si el manga ya se baja entero, no cambia nada); sin ellos, el manga entero.
+function enqueueDownload(mangaId, title, lang, chapterIds = null) {
   const existing = db.prepare('SELECT * FROM downloads WHERE manga_id = ?').get(mangaId)
   if (existing) {
+    if (!chapterIds && existing.scope !== 'all') dlUpdate(mangaId, { scope: 'all' })
+    // Si ya se estaba descargando, runDownload no verá lo nuevo: se vuelve a encolar al acabar.
     if (!['queued', 'downloading'].includes(existing.status)) dlUpdate(mangaId, { status: 'queued', lang: lang || existing.lang, error: null })
+    else if (existing.status === 'downloading') requeue.add(mangaId)
   } else {
     let folder = safeName(title)
     for (let i = 2; db.prepare('SELECT 1 FROM downloads WHERE folder = ?').get(folder); i++) folder = `${safeName(title)} (${i})`
     const now = Date.now()
-    db.prepare('INSERT INTO downloads (manga_id, title, folder, lang, status, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?)')
+    db.prepare('INSERT INTO downloads (manga_id, title, folder, lang, status, scope, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)')
-      .run(mangaId, title, folder, lang, 'queued', now, now)
+      .run(mangaId, title, folder, lang, 'queued', chapterIds ? 'some' : 'all', now, now)
+  }
+  if (chapterIds) {
+    const ins = db.prepare('INSERT OR IGNORE INTO download_wanted (chapter_id, manga_id, created_at) VALUES (?, ?, ?)')
+    const now = Date.now()
+    for (const id of chapterIds) ins.run(id, mangaId, now)
   }
   pumpDownloads()
 }
+const requeue = new Set()
 
 const cbzIndexCache = new Map()
 // hd: usar la versión reescalada si existe.
@@ -610,8 +637,9 @@ function localChapter(chapterId, hd = false) {
 }
 const withCurrent = d => (d ? { ...d, current: ['queued', 'downloading'].includes(d.status) ? dlCurrent.get(d.manga_id) ?? null : null } : null)
 const downloadInfo = (mangaId, size = false) => {
-  const d = withCurrent(db.prepare('SELECT manga_id, title, folder, lang, status, done, total, failed, error, updated_at FROM downloads WHERE manga_id = ?').get(mangaId))
+  const d = withCurrent(db.prepare('SELECT manga_id, title, folder, lang, status, scope, done, total, failed, error, updated_at FROM downloads WHERE manga_id = ?').get(mangaId))
   if (d && size) d.size = dirSize(mangaDirOf(d.folder))
+  if (d) d.wanted = db.prepare('SELECT chapter_id FROM download_wanted WHERE manga_id = ?').all(mangaId).map(r => r.chapter_id)
   return d
 }
 
@@ -787,14 +815,16 @@ async function route(req, res) {
       .map(d => ({ ...withCurrent(d), size: dirSize(mangaDirOf(d.folder)) })))
   }
   if ((m = /^\/api\/download\/([^/]+)$/.exec(p)) && MANGA_ID.test(m[1]) && method === 'GET') {
-    return json(res, 200, downloadInfo(m[1]))
+    return json(res, 200, downloadInfo(m[1], true))
   }
   if ((m = /^\/api\/download\/([^/]+)$/.exec(p)) && MANGA_ID.test(m[1]) && method === 'POST') {
     const b = await readBody(req)
     const dlLang = m[1].startsWith('lc~') ? 'es' : LANG.test(b.lang || '') ? b.lang : user.lang
     const title = String(b.title || '').slice(0, 300) || (await fetchMangaFull(m[1], dlLang)).manga.title
-    enqueueDownload(m[1], title, dlLang)
+    const ids = Array.isArray(b.chapterIds) ? b.chapterIds.map(String).filter(id => CHAPTER_ID.test(id)).slice(0, 5000) : null
-    return json(res, 200, downloadInfo(m[1]))
+    if (ids && !ids.length) throw new HttpError(400, 'Ningún capítulo válido')
+    enqueueDownload(m[1], title, dlLang, ids)
+    return json(res, 200, downloadInfo(m[1], true))
   }
   if ((m = /^\/api\/download\/([^/]+)$/.exec(p)) && MANGA_ID.test(m[1]) && method === 'DELETE') {
     if (!deleteDownload(m[1])) throw new HttpError(404, 'No hay copia local')