// Чтение хранилища в браузере — три пути ввода, все → RawNote[].
// Содержимое заметок остаётся в браузере (приватность-моат).

import type { RawNote } from "./types";

const SKIP = ["/.obsidian/", "/.trash/", "/.git/"];
function isMd(path: string): boolean {
  return path.toLowerCase().endsWith(".md") && !SKIP.some((s) => path.includes(s));
}

/* eslint-disable @typescript-eslint/no-explicit-any */

export function supportsFSA(): boolean {
  return typeof window !== "undefined" && "showDirectoryPicker" in window;
}

// 1. File System Access API (Chromium: Chrome/Edge/Brave)
export async function readViaFSA(): Promise<RawNote[]> {
  const dir: any = await (window as any).showDirectoryPicker();
  const notes: RawNote[] = [];
  async function walk(handle: any, prefix: string): Promise<void> {
    for await (const [name, h] of handle.entries()) {
      const path = prefix + "/" + name;
      if (h.kind === "directory") {
        if (name.startsWith(".")) continue;
        await walk(h, path);
      } else if (isMd(path)) {
        const file: File = await h.getFile();
        notes.push({ name, text: await file.text(), ctime: file.lastModified, mtime: file.lastModified });
      }
    }
  }
  await walk(dir, "");
  return notes;
}

// 2. <input type="file" webkitdirectory> (Safari / Firefox)
export async function readViaInput(files: FileList): Promise<RawNote[]> {
  const notes: RawNote[] = [];
  for (const file of Array.from(files)) {
    const path = (file as any).webkitRelativePath || file.name;
    if (!isMd(path)) continue;
    notes.push({ name: file.name, text: await file.text(), ctime: file.lastModified, mtime: file.lastModified });
  }
  return notes;
}

// 3. drag-drop папки (webkitGetAsEntry)
export async function readViaDrop(items: DataTransferItemList): Promise<RawNote[]> {
  const notes: RawNote[] = [];
  const roots: any[] = [];
  for (const item of Array.from(items)) {
    const entry = (item as any).webkitGetAsEntry?.();
    if (entry) roots.push(entry);
  }
  async function readEntry(entry: any, prefix: string): Promise<void> {
    const path = prefix + "/" + entry.name;
    if (entry.isDirectory) {
      if (entry.name.startsWith(".")) return;
      const reader = entry.createReader();
      const children: any[] = await new Promise((resolve) => {
        const all: any[] = [];
        const readBatch = () =>
          reader.readEntries((batch: any[]) => {
            if (!batch.length) return resolve(all);
            all.push(...batch);
            readBatch();
          });
        readBatch();
      });
      for (const c of children) await readEntry(c, path);
    } else if (isMd(path)) {
      const file: File = await new Promise((resolve, reject) => entry.file(resolve, reject));
      notes.push({ name: entry.name, text: await file.text(), ctime: file.lastModified, mtime: file.lastModified });
    }
  }
  for (const e of roots) await readEntry(e, "");
  return notes;
}