"use strict";

// ================================================================
//  AMPP Folder Placer — lib/ampp-folder-placer.js
//
//  placeAsset()             — original v3.5 port (filename -- parsing)
//  placeAssetInFolderById() — direct placement by known folder ID
//  listAmppFolders()        — fetch AMPP virtual folder tree (probes endpoints)
//  amppRequest()            — shared low-level REST helper
// ================================================================

const PREFIX_DELIM = "--";

// ── Low-level REST helper ─────────────────────────────────────────────────────
async function amppRequest(method, baseUrl, token, apiPath, body = null) {
  const url = `${baseUrl.replace(/\/$/, "")}/${apiPath}`;
  const opts = {
    method,
    headers: {
      Authorization: `Bearer ${token}`,
      "Content-Type": "application/json",
    },
    signal: AbortSignal.timeout(15000),
  };
  if (body !== null) {
    opts.body = typeof body === "string" ? body : JSON.stringify(body);
  }
  const r = await fetch(url, opts);
  if (!r.ok) {
    const text = await r.text().catch(() => "");
    throw new Error(
      `AMPP API ${method} ${apiPath} → HTTP ${r.status}: ${text.slice(0, 200)}`
    );
  }
  return r.json();
}

// ── List AMPP virtual folders ────────────────────────────────────────────────
// Probes multiple candidate endpoints in order; uses the first that responds.
// Returns: { folders: [{id, name, parentId, path}], endpoint }
const FOLDER_LIST_CANDIDATES = [
  "api/v1/store/folder/folders?limit=500",
  "api/v1/store/folder/folders",
  "api/v1/store/folder/folder/list",
  "api/v1/store/folder/folders/list",
];

async function listAmppFolders(baseUrl, token) {
  let lastError = null;

  for (const candidate of FOLDER_LIST_CANDIDATES) {
    try {
      const resp = await amppRequest("GET", baseUrl, token, candidate);

      // Normalise whatever shape AMPP returns into an array
      const raw = Array.isArray(resp)
        ? resp
        : resp?.["folder:list"] ?? resp?.folders ?? resp?.items ?? resp?.results ?? [];

      if (!Array.isArray(raw)) {
        console.warn(`[AMPP folders] ${candidate} returned non-array: ${typeof raw}`);
        continue;
      }

      const folders = raw.map((f) => ({
        id:       (f["folder:id"]       ?? f.id         ?? "").toString().trim(),
        name:     (f["name:text"]       ?? f.name       ?? f["folder:name"] ?? "").toString().trim(),
        parentId: (f["parentFolder:id"] ?? f.parentId   ?? f["parent:id"]   ?? "").toString().trim(),
        path:     (f["folder:path"]     ?? f.path       ?? "").toString().trim(),
      })).filter(f => f.id && f.name);

      console.log(`[AMPP folders] ${folders.length} folders via ${candidate}`);
      return { folders, endpoint: candidate };
    } catch (err) {
      lastError = err;
      console.warn(`[AMPP folders] ${candidate} failed: ${err.message}`);
    }
  }

  throw new Error(`Could not list AMPP folders — all endpoints failed. Last error: ${lastError?.message}`);
}

// ── Direct placement by known folder ID ──────────────────────────────────────
// Used by the background placement worker.  No filename parsing — we already
// know the folder ID from what the user selected in the UI.
async function placeAssetInFolderById(baseUrl, assetId, folderId, token) {
  if (!assetId)  throw new Error("assetId is required");
  if (!folderId) throw new Error("folderId is required");

  const linkBody = JSON.stringify(
    { "folder:id": folderId, "asset:id": assetId },
    null, 0
  );
  await amppRequest("POST", baseUrl, token, "api/v1/store/folder/references", linkBody);
  return { placed: true, folderId, assetId };
}

// ── Original v3.5 placement (filename -- parsing) ────────────────────────────
// Kept for the manual /api/ampp/place endpoint.
async function placeAsset(baseUrl, assetName, assetId, token) {
  if (!assetName.includes(PREFIX_DELIM)) {
    return { placed: false, folderId: null, path: "", reason: `no "${PREFIX_DELIM}" delimiter in filename` };
  }

  const parts = assetName.split(PREFIX_DELIM);
  if (parts.length < 2) {
    return { placed: false, folderId: null, path: "", reason: "fewer than 2 parts after split" };
  }

  const folderNames = parts.slice(0, -1);
  let parentId = null;
  let currentPath = "";
  let expectedDepth = 0;

  for (const rawName of folderNames) {
    const fname = rawName.trim();
    if (!fname) continue;

    currentPath = currentPath ? `${currentPath}/${fname}` : fname;
    expectedDepth++;
    let folderId = null;

    try {
      const encoded = currentPath.split("/").map(encodeURIComponent).join("/");
      const resp = await amppRequest("GET", baseUrl, token, `api/v1/store/folder/folders/hierarchy?path=${encoded}`);
      if (!resp || typeof resp !== "object" || Array.isArray(resp)) throw new Error(`Hierarchy resp is not an object: ${typeof resp}`);
      const hlist = resp["hierarchy:list"];
      if (!Array.isArray(hlist)) throw new Error(`hierarchy:list is not an array: ${typeof hlist}`);
      if (hlist.length === expectedDepth) {
        const last = hlist[hlist.length - 1];
        const candidateId = (last?.["folder:id"] ?? "").toString().trim();
        if (candidateId) folderId = candidateId;
      }
    } catch (lookupEx) {
      folderId = null;
      console.warn(`[AMPP folder] Hierarchy lookup failed for '${currentPath}': ${lookupEx.message}`);
    }

    if (!folderId) {
      const createBody = { "name:text": fname };
      if (parentId) createBody["parentFolders:tags"] = [parentId];
      try {
        const fresp = await amppRequest("POST", baseUrl, token, "api/v1/store/folder/folders", createBody);
        if (!fresp || typeof fresp !== "object" || Array.isArray(fresp)) throw new Error(`Folder create resp is not an object: ${typeof fresp}`);
        const createdId = (fresp["folder:id"] ?? "").toString().trim();
        if (!createdId) throw new Error("Folder create resp missing folder:id");
        folderId = createdId;
      } catch (ex) {
        throw new Error(`Failed to create folder '${fname}' under path '${currentPath}': ${ex.message}`);
      }
    }

    parentId = folderId;
  }

  if (parentId) {
    const linkBody = JSON.stringify({ "folder:id": parentId, "asset:id": assetId }, null, 0);
    await amppRequest("POST", baseUrl, token, "api/v1/store/folder/references", linkBody);
  }

  return { placed: true, folderId: parentId, path: currentPath };
}

module.exports = { placeAsset, placeAssetInFolderById, listAmppFolders, amppRequest };