import { join } from "node:path";
import type {
  FileRootId,
  FilesRecordSourcesResult,
  FilesTreeQuery,
  FilesTreeResult,
  OrganizationStatus,
} from "@umt/contracts";
import { sql } from "@umt/db";
import { isRemotePath, vlstat as lstat, vreaddirents as readdirents } from "../../storage/vfs.ts";
import { FilesError, type FmDeps, isTempName, loadRootDefs, resolveIn, within } from "./common.ts";
import { kindOfName } from "./list.ts";

// G8 目录摘要(树折叠 / 上一级):只列子目录(是否还有下级)+ 本目录递归视频数与已登记数;
// G5 整理记录 → 源 FileRef(整理记录"重新整理"按登记目录 hostPath 换算)。

const likePrefix = (rel: string) => `${rel.replace(/[\\%_]/g, (m) => `\\${m}`)}/%`;
const hiddenName = (n: string) => n.startsWith(".") || isTempName(n);

export async function treeOf(d: FmDeps, q: FilesTreeQuery): Promise<FilesTreeResult> {
  const r = await resolveIn(d, q.root, q.path);
  if (!r.lst?.isDirectory() || r.isSymlink) throw new FilesError("bad_request", `不是目录：${r.rel || "/"}`);
  const remote = isRemotePath(r.abs);
  const names = await readdirents(r.abs);
  const subdirs = names
    .filter((n) => n.isDirectory() && !hiddenName(n.name))
    .map((n) => n.name)
    .sort((a, b) => a.localeCompare(b));
  const max = d.options.listMaxEntries;
  const truncated = subdirs.length > max;
  const dirs = await Promise.all(
    subdirs.slice(0, max).map(async (name) => {
      const path = r.rel ? `${r.rel}/${name}` : name;
      // Alist:不逐个子目录再列一遍(避免 N 次网盘请求),按「可能有下级」展示,展开时再列
      if (remote) return { name, path, hasChildren: true };
      const kids = await readdirents(join(r.abs, name)).catch(() => []);
      return { name, path, hasChildren: kids.some((k) => k.isDirectory() && !hiddenName(k.name)) };
    }),
  );

  // 递归数视频(上限 dirSummaryMax 项,同列表目录摘要口径)
  let seen = 0;
  let videoCount = 0;
  let partial = false;
  // Alist:只数当前目录这一层(不递归打网盘接口),结果标为不完整
  if (remote) {
    videoCount = names.filter((n) => n.isFile() && kindOfName(n.name) === "video").length;
    partial = names.some((n) => n.isDirectory());
  }
  const stack = remote ? [] : [r.abs];
  while (stack.length > 0 && !partial) {
    const dir = stack.pop()!;
    for (const n of await readdirents(dir).catch(() => [])) {
      if (++seen > d.options.dirSummaryMax) {
        partial = true;
        break;
      }
      if (n.name.startsWith(".")) continue;
      if (n.isDirectory()) stack.push(join(dir, n.name));
      else if (n.isFile() && kindOfName(n.name) === "video") videoCount++;
    }
  }
  let registeredCount = 0;
  if (r.def.libraryRootId) {
    const row = await sql<{ n: number }>`
      select count(*)::int as n from asset_location
       where library_root_id = ${r.def.libraryRootId} and status = 'available'
         and (${r.rel} = '' or relative_path like ${likePrefix(r.rel)})`.execute(d.ctx.db);
    registeredCount = row.rows[0]?.n ?? 0;
  }
  const slash = r.rel.lastIndexOf("/");
  return {
    root: q.root,
    path: r.rel,
    name: r.rel ? r.rel.slice(slash + 1) : r.def.name,
    parent: r.rel === "" ? null : slash < 0 ? "" : r.rel.slice(0, slash),
    dirs,
    truncated,
    summary: { videoCount, registeredCount, partial },
  };
}

export async function recordSources(d: FmDeps, recordId: string): Promise<FilesRecordSourcesResult> {
  const db = d.ctx.db;
  const rec = await db
    .selectFrom("organization_record")
    .select([
      "id",
      "media_entity_id",
      "action",
      "status",
      "source_path",
      "source_path_view",
      "target_path",
      "target_library_root_id",
      "plan",
    ])
    .where("id", "=", recordId)
    .executeTakeFirst();
  if (!rec) throw new FilesError("not_found", "整理记录不存在");
  const mains = await db
    .selectFrom("organization_file_result")
    .select(["source_path", "target_path", "target_library_root_id"])
    .where("organization_record_id", "=", rec.id)
    .where("role", "=", "main")
    .orderBy("ordinal")
    .limit(500)
    .execute();
  const defs = (await loadRootDefs(db)).sort((a, b) => b.hostPath.length - a.hostPath.length);
  const toRef = (abs: string) => {
    const def = defs.find((x) => within(abs, x.hostPath));
    return def
      ? { root: def.id as FileRootId, path: abs === def.hostPath ? "" : abs.slice(def.hostPath.length + 1) }
      : null;
  };
  // Successful moves have removed their inputs: reorganize the existing library files.
  const moved = rec.action === "move" && rec.status === "succeeded";
  const targetOf = (rootId: string | null, path: string | null) => {
    const root = defs.find((d) => d.libraryRootId === rootId);
    return root && path && within(join(root.hostPath, path), root.hostPath) ? join(root.hostPath, path) : null;
  };
  let sources = moved
    ? mains.map((m) => targetOf(m.target_library_root_id, m.target_path)).filter((p): p is string => !!p)
    : mains.map((m) => m.source_path);
  const dir = moved ? targetOf(rec.target_library_root_id, rec.target_path) : rec.source_path;
  if (
    dir &&
    sources.length > 1 &&
    sources.every((p) => within(p, dir)) &&
    !defs.some((x) => x.hostPath === dir.replace(/\/+$/, ""))
  )
    sources = [dir];
  if (sources.length === 0 && dir) sources = [dir];
  const items: FilesRecordSourcesResult["items"] = [];
  const unresolved: string[] = [];
  for (const abs of [...new Set(sources)]) {
    const ref = moved || rec.source_path_view === "local" ? toRef(abs) : null;
    const exists = ref
      ? await lstat(abs).then(
          () => true,
          () => false,
        )
      : false;
    if (ref && exists) items.push(ref);
    else unresolved.push(abs);
  }
  return {
    recordId: rec.id,
    mediaEntityId: rec.media_entity_id,
    action: rec.action,
    status: rec.status as OrganizationStatus,
    items,
    unresolved,
    ...(rec.plan &&
    typeof rec.plan === "object" &&
    "sourceConfigId" in rec.plan &&
    typeof rec.plan.sourceConfigId === "string"
      ? { sourceConfigId: rec.plan.sourceConfigId }
      : {}),
  };
}