feat: Revamp EPUB import process with batch upload support and enhanced API integration

- Introduced a new batch import client for handling multiple EPUB files simultaneously.
- Updated API routes for previewing and importing EPUB files, improving error handling and response management.
- Enhanced genre management during import, allowing for dynamic creation and association of genres.
- Implemented long-fetch handling to accommodate lengthy processing times for large EPUB files.
- Refined UI components for better user experience in the import workflow.

app/mod/import/import-batch-client.tsx

@@ -0,0 +1,474 @@
+"use client"
+
+import { useState } from "react"
+import type { InputHTMLAttributes } from "react"
+import { Loader2 } from "lucide-react"
+import { Input } from "@/components/ui/input"
+import { Progress } from "@/components/ui/progress"
+import { toast } from "sonner"
+
+/** Đồng bộ với `MOD_EPUB_MAX_CHAPTERS` trên reader-api. */
+const BATCH_IMPORT_MAX_CHAPTERS = 4000
+/** Một EPUB: preview + AI + parse + import — vượt quá thì hủy và sang file kế. */
+const BATCH_IMPORT_MAX_MS_PER_FILE = 25 * 60 * 1000
+
+type Genre = { id: string; name: string }
+
+type BatchRow = {
+  fileName: string
+  ok: boolean
+  novelId?: string
+  /** Tiêu đề sau preview (dùng so trùng DB / hiển thị cho mod). */
+  resolvedTitle?: string
+  error?: string
+  skippedDuplicate?: boolean
+  skippedGuard?: boolean
+  chapters?: number
+}
+
+function isAbortError(e: unknown): boolean {
+  return e instanceof DOMException && e.name === "AbortError"
+}
+
+/** Đường dẫn hiển thị khi chọn từ thư mục (Chrome: folder/book.epub) */
+function getFileLabel(file: File): string {
+  const rp = (file as File & { webkitRelativePath?: string }).webkitRelativePath
+  return rp && rp.trim().length > 0 ? rp.trim() : file.name || "upload.epub"
+}
+
+function epubFilesOnly(files: FileList | File[]): File[] {
+  return Array.from(files).filter((f) => /\.epub$/i.test(f.name))
+}
+
+/** Giống chuẩn hóa tiêu đề khi so `Novel.lower(title)` trên API. */
+function normalizeNovelTitle(raw: string): string {
+  return raw.split(/\s+/).join(" ").trim()
+}
+
+export function ImportBatchClient() {
+  const [splitMode, setSplitMode] = useState<"toc" | "regex">("toc")
+  const [chapterStartPattern, setChapterStartPattern] = useState(
+    "^\\s*(?:[#>*\\-\\[]\\s*)*(?:ch(?:u\\.?|ương|uong)?|chapter|hồi|hoi|quyển|quyen|phần|phan|tập|tap)\\s*\\d+(?:[\\.:\\-\\)]\\s*|\\s+).+$",
+  )
+  const [replaceExisting, setReplaceExisting] = useState(false)
+  const [running, setRunning] = useState(false)
+  const [progress, setProgress] = useState({ current: 0, total: 0 })
+  const [rows, setRows] = useState<BatchRow[]>([])
+
+  const fetchGenres = async (signal?: AbortSignal): Promise<Genre[]> => {
+    const res = await fetch("/api/mod/the-loai", { credentials: "include", signal })
+    const data = await res.json()
+    if (!res.ok) throw new Error(data?.error || data?.detail || "Không lấy được thể loại")
+    return Array.isArray(data) ? (data as Genre[]) : []
+  }
+
+  const ensureGenreIdsByNames = async (names: string[], signal?: AbortSignal): Promise<string[]> => {
+    const uniqueNames = [...new Set(names.map((n) => n.trim()).filter(Boolean))].slice(0, 6)
+    if (uniqueNames.length === 0) return []
+
+    let genreList = await fetchGenres(signal)
+    const ids: string[] = []
+
+    for (const name of uniqueNames) {
+      const existing = genreList.find((g) => g.name.trim().toLowerCase() === name.toLowerCase())
+      if (existing) {
+        ids.push(existing.id)
+        continue
+      }
+
+      const res = await fetch("/api/mod/the-loai", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        credentials: "include",
+        signal,
+        body: JSON.stringify({ name, description: "" }),
+      })
+      const data = await res.json().catch(() => ({}))
+      if (!res.ok) {
+        throw new Error(data?.error || data?.detail || `Không thể tạo thể loại: ${name}`)
+      }
+      if (data?.id) {
+        ids.push(data.id)
+      }
+      genreList = await fetchGenres(signal)
+    }
+
+    return [...new Set(ids)].slice(0, 6)
+  }
+
+  const processOneFile = async (file: File, signal: AbortSignal): Promise<BatchRow> => {
+    const displayPath = getFileLabel(file)
+    const baseName = file.name || "upload.epub"
+
+    const formPreview = new FormData()
+    formPreview.append("file", file)
+    const r1 = await fetch("/api/import/uploads/preview", {
+      method: "POST",
+      credentials: "include",
+      body: formPreview,
+      signal,
+    })
+    const d1 = await r1.json().catch(() => ({}))
+    if (!r1.ok) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        error: String(d1?.detail || "Bước 1: preview EPUB thất bại"),
+      }
+    }
+
+    const title =
+      String(d1?.suggested?.title || "").trim() || baseName.replace(/\.epub$/i, "") || "Untitled"
+    const author = String(d1?.suggested?.author || "").trim() || "Unknown"
+    const normalizedTitle = normalizeNovelTitle(title) || "Untitled"
+
+    if (!replaceExisting) {
+      const checkUrl = `/api/mod/truyen/by-title?title=${encodeURIComponent(normalizedTitle)}`
+      const cr = await fetch(checkUrl, { credentials: "include", signal })
+      const cd = await cr.json().catch(() => ({}))
+      if (cr.ok && cd?.exists === true && cd?.novel?.id) {
+        const nt = String(cd.novel.title || normalizedTitle)
+        const nid = String(cd.novel.id)
+        return {
+          fileName: displayPath,
+          ok: false,
+          skippedDuplicate: true,
+          resolvedTitle: title,
+          novelId: nid,
+          error: `Đã có trong DB — bỏ qua batch · «${nt}» · novelId: ${nid}`,
+        }
+      }
+    }
+
+    const formAi = new FormData()
+    formAi.append("file", file)
+    formAi.append("splitMode", splitMode)
+    if (splitMode === "regex") formAi.append("chapterRegex", chapterStartPattern)
+    formAi.append("title", title)
+    formAi.append("authorName", author)
+
+    const r2 = await fetch("/api/mod/epub/ai-suggest", {
+      method: "POST",
+      credentials: "include",
+      body: formAi,
+      signal,
+    })
+    const d2 = await r2.json().catch(() => ({}))
+    if (!r2.ok) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        resolvedTitle: title,
+        error: String(d2?.detail || "Bước 2: AI gợi ý thất bại"),
+      }
+    }
+
+    const genreNames: string[] = (d2?.suggestedGenres || []).slice(0, 6)
+    let genreIds: string[] = []
+    try {
+      genreIds = await ensureGenreIdsByNames(genreNames, signal)
+    } catch (e) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        resolvedTitle: title,
+        error: e instanceof Error ? e.message : "Bước 2: tạo/ghép thể loại thất bại",
+      }
+    }
+
+    const description = String(d2?.shortDescription || "").trim()
+    const statusRaw = String(d2?.suggestedStatus || "").trim()
+    const status =
+      statusRaw === "Hoàn thành" || statusRaw === "Tạm ngưng" || statusRaw === "Đang ra" ? statusRaw : "Đang ra"
+
+    const formParse = new FormData()
+    formParse.append("file", file)
+    formParse.append("preview", "true")
+    formParse.append("splitMode", splitMode)
+    if (splitMode === "regex") formParse.append("chapterRegex", chapterStartPattern)
+
+    const r3 = await fetch("/api/mod/epub", { method: "POST", credentials: "include", body: formParse, signal })
+    const d3 = await r3.json().catch(() => ({}))
+    if (!r3.ok) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        resolvedTitle: title,
+        error: String(d3?.detail || "Bước 3: tách chương (preview) thất bại"),
+      }
+    }
+
+    const chapterCount = Number(d3?.novel?.totalChapters ?? d3?.chapterCount ?? 0)
+    if (d3?.importBlocked === true || chapterCount > BATCH_IMPORT_MAX_CHAPTERS) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        skippedGuard: true,
+        resolvedTitle: title,
+        chapters: chapterCount || undefined,
+        error: String(
+          d3?.importBlockedReason ||
+            `Quá ${BATCH_IMPORT_MAX_CHAPTERS.toLocaleString()} chương (${chapterCount.toLocaleString()}) — đã bỏ qua`,
+        ),
+      }
+    }
+    const sampleLen = Array.isArray(d3?.sample) ? d3.sample.length : 0
+    const chaptersPrevLen = Array.isArray(d3?.chaptersPreview) ? d3.chaptersPreview.length : 0
+    if (chapterCount <= 0 && sampleLen <= 0 && chaptersPrevLen <= 0) {
+      return {
+        fileName: displayPath,
+        ok: false,
+        resolvedTitle: title,
+        error: "Bước 3: không tách được chương với cấu hình TOC/Regex hiện tại",
+      }
+    }
+
+    const formImport = new FormData()
+    formImport.append("file", file)
+    formImport.append("preview", "false")
+    formImport.append("splitMode", splitMode)
+    if (splitMode === "regex") formImport.append("chapterRegex", chapterStartPattern)
+    formImport.append("title", title)
+    formImport.append("authorName", author)
+    formImport.append("status", status)
+    formImport.append("description", description)
+    formImport.append("genreIds", genreIds.join(","))
+    formImport.append("replaceExisting", String(replaceExisting))
+
+    const r4 = await fetch("/api/mod/epub", { method: "POST", credentials: "include", body: formImport, signal })
+    const d4 = await r4.json().catch(() => ({}))
+
+    if (r4.status === 409 && d4?.code === "DUPLICATE_TITLE") {
+      const ex = d4?.existingNovel as { id?: string; title?: string } | undefined
+      const nid = ex?.id ? String(ex.id) : ""
+      const nt = ex?.title ? String(ex.title) : ""
+      return {
+        fileName: displayPath,
+        ok: false,
+        skippedDuplicate: true,
+        resolvedTitle: title,
+        novelId: nid || undefined,
+        error: nid
+          ? `Đã có trong DB — bỏ qua · «${nt || title}» · novelId: ${nid}`
+          : String(d4?.error || "Trùng tiêu đề"),
+      }
+    }
+    if (!r4.ok) {
+      const detail = String(d4?.detail || "Bước 4: import thất bại")
+      const limitHit =
+        r4.status === 400 &&
+        (detail.includes("giới hạn") || detail.includes("Quá giới hạn") || detail.includes("chương sau khi tách"))
+      return {
+        fileName: displayPath,
+        ok: false,
+        skippedGuard: limitHit,
+        resolvedTitle: title,
+        error: detail,
+      }
+    }
+
+    return {
+      fileName: displayPath,
+      ok: true,
+      resolvedTitle: title,
+      novelId: String(d4?.novelId || ""),
+      chapters: Number(d4?.totalChapters ?? chapterCount),
+    }
+  }
+
+  const runBatch = async (fileList: FileList | null) => {
+    if (!fileList?.length) {
+      toast.error("Chọn ít nhất một file EPUB")
+      return
+    }
+    const list = epubFilesOnly(fileList)
+    if (!list.length) {
+      toast.error("Không thấy file .epub (kiểm tra đuôi hoặc chọn đúng thư mục chứa EPUB)")
+      return
+    }
+
+    setRows([])
+    setRunning(true)
+    setProgress({ current: 0, total: list.length })
+
+    const out: BatchRow[] = []
+    for (let i = 0; i < list.length; i++) {
+      setProgress({ current: i + 1, total: list.length })
+      const ac = new AbortController()
+      const limitTimer = window.setTimeout(() => ac.abort(), BATCH_IMPORT_MAX_MS_PER_FILE)
+      try {
+        const row = await processOneFile(list[i], ac.signal)
+        out.push(row)
+      } catch (e) {
+        if (isAbortError(e)) {
+          out.push({
+            fileName: getFileLabel(list[i]),
+            ok: false,
+            skippedGuard: true,
+            error: `Quá ${Math.round(BATCH_IMPORT_MAX_MS_PER_FILE / 60000)} phút cho một file — đã bỏ qua, chuyển file kế`,
+          })
+        } else {
+          out.push({
+            fileName: getFileLabel(list[i]),
+            ok: false,
+            error: e instanceof Error ? e.message : "Lỗi không xác định",
+          })
+        }
+      } finally {
+        window.clearTimeout(limitTimer)
+      }
+      setRows([...out])
+    }
+
+    setRunning(false)
+    const okCount = out.filter((r) => r.ok).length
+    const dupSkip = out.filter((r) => !r.ok && r.skippedDuplicate).length
+    const guardSkip = out.filter((r) => !r.ok && r.skippedGuard).length
+    const errCount = out.filter((r) => !r.ok && !r.skippedDuplicate && !r.skippedGuard).length
+    toast.success(
+      `Hoàn tất ${list.length} file: ${okCount} import OK · ${dupSkip} đã có (bỏ qua) · ${guardSkip} bỏ qua (giới hạn/thời gian) · ${errCount} lỗi`,
+      { duration: 8000 },
+    )
+  }
+
+  const pct = progress.total ? Math.round((progress.current / progress.total) * 100) : 0
+
+  return (
+    <div className="space-y-6 p-4 md:p-6">
+      <div>
+        <h1 className="text-2xl font-bold">Import nhiều EPUB (tự động)</h1>
+      </div>
+
+      <section className="space-y-3 rounded-xl border p-4">
+        <p className="text-sm font-medium">Cấu hình chung</p>
+        <div className="flex flex-wrap items-center gap-3 rounded-md border bg-muted/30 p-3">
+          <label className="text-sm">Tách chương:</label>
+          <select
+            className="rounded border px-2 py-1 text-sm"
+            value={splitMode}
+            onChange={(e) => setSplitMode(e.target.value as "toc" | "regex")}
+            disabled={running}
+          >
+            <option value="toc">TOC</option>
+            <option value="regex">Regex tiếng Việt</option>
+          </select>
+          {splitMode === "regex" && (
+            <Input
+              className="max-w-xl font-mono text-xs"
+              value={chapterStartPattern}
+              onChange={(e) => setChapterStartPattern(e.target.value)}
+              disabled={running}
+              placeholder="Regex bắt đầu chương"
+            />
+          )}
+        </div>
+        <label className="flex items-center gap-2 text-sm">
+          <input type="checkbox" checked={replaceExisting} onChange={(e) => setReplaceExisting(e.target.checked)} disabled={running} />
+          Ghi đè nếu trùng tiêu đề (tắt = batch chỉ skip khi đã có truyện cùng tiêu đề)
+        </label>
+        <p className="text-xs text-muted-foreground">
+          An toàn batch: tối đa {BATCH_IMPORT_MAX_CHAPTERS.toLocaleString()} chương sau khi tách mỗi file; quá{" "}
+          {Math.round(BATCH_IMPORT_MAX_MS_PER_FILE / 60000)} phút/file thì bỏ qua và xử lý file tiếp theo.
+        </p>
+      </section>
+
+      <section className="space-y-4 rounded-xl border p-4">
+        <div className="space-y-2">
+          <p className="text-sm font-medium">Thư mục cha (quét đệ quy)</p>
+          <Input
+            type="file"
+            {...({ webkitdirectory: "", mozdirectory: "" } as InputHTMLAttributes<HTMLInputElement>)}
+            disabled={running}
+            className="cursor-pointer"
+            onChange={(e) => {
+              const fl = e.target.files
+              void runBatch(fl)
+              e.currentTarget.value = ""
+            }}
+          />
+        </div>
+        {running && (
+          <div className="space-y-2">
+            <div className="flex items-center gap-2 text-sm text-muted-foreground">
+              <Loader2 className="h-4 w-4 animate-spin" />
+              Đang xử lý {progress.current}/{progress.total}…
+            </div>
+            <Progress value={pct} />
+          </div>
+        )}
+      </section>
+
+      {rows.length > 0 && (
+        <section className="rounded-xl border">
+          <div className="border-b px-4 py-2 text-sm font-medium">Kết quả</div>
+          <div className="flex flex-wrap gap-3 border-b bg-muted/20 px-4 py-2 text-xs text-muted-foreground">
+            <span>
+              Thành công:{" "}
+              <strong className="text-emerald-600">{rows.filter((r) => r.ok).length}</strong>
+            </span>
+            <span>
+              Đã có (skip):{" "}
+              <strong className="text-amber-700">{rows.filter((r) => r.skippedDuplicate).length}</strong>
+            </span>
+            <span>
+              Bỏ qua an toàn:{" "}
+              <strong className="text-amber-700">{rows.filter((r) => r.skippedGuard).length}</strong>
+            </span>
+            <span>
+              Lỗi:{" "}
+              <strong className="text-destructive">
+                {rows.filter((r) => !r.ok && !r.skippedDuplicate && !r.skippedGuard).length}
+              </strong>
+            </span>
+            <span>
+              Tổng: <strong className="text-foreground">{rows.length}</strong>
+            </span>
+          </div>
+          <div className="max-h-[480px] overflow-auto">
+            <table className="w-full text-left text-sm">
+              <thead>
+                <tr className="border-b bg-muted/40 text-xs text-muted-foreground">
+                  <th className="px-3 py-2">File</th>
+                  <th className="px-3 py-2">Tiêu đề (preview)</th>
+                  <th className="px-3 py-2">Trạng thái</th>
+                  <th className="px-3 py-2">Chi tiết</th>
+                </tr>
+              </thead>
+              <tbody>
+                {rows.map((r, idx) => (
+                  <tr key={`${r.fileName}-${idx}`} className="border-b last:border-0">
+                    <td className="max-w-[220px] break-all px-3 py-2 align-top">{r.fileName}</td>
+                    <td className="max-w-[200px] break-words px-3 py-2 align-top text-xs">
+                      {r.resolvedTitle || "—"}
+                    </td>
+                    <td className="whitespace-nowrap px-3 py-2 align-top">
+                      {r.ok ? (
+                        <span className="text-emerald-600">OK</span>
+                      ) : r.skippedDuplicate ? (
+                        <span className="text-amber-600">Đã có · skip</span>
+                      ) : r.skippedGuard ? (
+                        <span className="text-amber-600">Bỏ qua</span>
+                      ) : (
+                        <span className="text-destructive">Lỗi</span>
+                      )}
+                    </td>
+                    <td className="min-w-[200px] px-3 py-2 align-top text-xs text-muted-foreground">
+                      {r.ok && r.novelId ? (
+                        <>
+                          novelId: {r.novelId}
+                          {typeof r.chapters === "number" ? ` · ${r.chapters} chương` : ""}
+                        </>
+                      ) : (
+                        r.error || "—"
+                      )}
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </section>
+      )}
+    </div>
+  )
+}