"use strict";

// ================================================================
//  AMPP Folder Placer — lib/ampp-folder-placer.js
//  Node.js port of folder-organizer-v3.5.py
//
//  Given an AMPP base URL, Bearer token, asset ID, and asset name
//  (with "--" as the path delimiter), finds or creates the nested
//  AMPP virtual-folder hierarchy, then links the asset to the
//  deepest folder.
//
//  All v3.5 defensive guards are ported:
//    1. Validate resp is a plain object before .get()
//    2. Validate hlist is an array before indexing
//    3. Only trust a FULL depth match from the hierarchy lookup
//    4. Specific catch on hierarchy lookup — fall through to create,
//       don't silently swallow ALL errors
//    5. Asset link failure throws — caller sees it in the AMPP job log
//    6. Defensive .toString().trim() on every folder:id returned
// ================================================================

const PREFIX_DELIM = "--";

/**
 * Low-level AMPP REST call.
 * Throws on non-2xx responses with a descriptive message.
 *
 * @param {"GET"|"POST"} method
 * @param {string} baseUrl   e.g. "https://us-east-1.gvampp.com"
 * @param {string} token     Bearer access token
 * @param {string} apiPath   relative path, e.g. "api/v1/store/folder/folders"
 * @param {object|string|null} body
 * @returns {Promise<object>}
 */
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();
}

/**
 * placeAsset — find/create nested AMPP virtual folders and link an asset.
 *
 * Mirrors folder-organizer-v3.5.py exactly:
 *   - Splits assetName on "--", uses all but the last segment as folder names.
 *   - Walks the hierarchy left-to-right, doing a GET lookup at each level.
 *   - Only trusts a lookup result when returned depth == expected depth (v3.5 fix #3).
 *   - Creates the folder (with correct parentFolders:tags) if not found.
 *   - Links the asset to the deepest folder after all levels are resolved.
 *
 * @param {string} baseUrl   AMPP base URL
 * @param {string} assetName Filename with "--" delimiters (e.g. "NEWS--PKG--clip.mxf")
 * @param {string} assetId   AMPP asset:id (string)
 * @param {string} token     Bearer access token
 * @returns {Promise<{ placed: boolean, folderId: string|null, path: string, reason?: string }>}
 */
async function placeAsset(baseUrl, assetName, assetId, token) {
  // No delimiter → skip (same behaviour as the IronPython script's `pass`)
  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",
    };
  }

  // All segments except the last are folder names; the last is the filename.
  const folderNames = parts.slice(0, -1);
  let parentId = null;
  let currentPath = "";
  let expectedDepth = 0; // how many path segments we've built so far

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

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

    // ── Hierarchy lookup (v3.5 fixes #1 #2 #3 #4) ─────────────────────────
    try {
      // URL-encode the path but keep "/" intact (matches urllib.parse.quote safe="/")
      const encoded = currentPath
        .split("/")
        .map(encodeURIComponent)
        .join("/");

      const resp = await amppRequest(
        "GET",
        baseUrl,
        token,
        `api/v1/store/folder/folders/hierarchy?path=${encoded}`
      );

      // Fix #1 — resp must be a plain object
      if (!resp || typeof resp !== "object" || Array.isArray(resp)) {
        throw new Error(`Hierarchy resp is not an object: ${typeof resp}`);
      }

      const hlist = resp["hierarchy:list"];

      // Fix #2 — hlist must be an array
      if (!Array.isArray(hlist)) {
        throw new Error(`hierarchy:list is not an array: ${typeof hlist}`);
      }

      // Fix #3 — only trust a FULL depth match
      // A partial match (API returns A, A/B when we need A/B/C) means the full
      // path doesn't exist yet — fall through to creation.
      if (hlist.length === expectedDepth) {
        const last = hlist[hlist.length - 1];
        // Fix #6 — defensive strip on folder:id
        const candidateId = (last?.["folder:id"] ?? "").toString().trim();
        if (candidateId) folderId = candidateId;
      }
    } catch (lookupEx) {
      // Fix #4 — specific catch: log and fall through to create.
      // Don't hard-fail the whole placement for a lookup error.
      folderId = null;
      console.warn(
        `[AMPP folder] Hierarchy lookup failed for '${currentPath}': ${lookupEx.message}`
      );
    }

    // ── Create folder if not found ─────────────────────────────────────────
    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
        );

        // Fix #1 applied to create response too
        if (!fresp || typeof fresp !== "object" || Array.isArray(fresp)) {
          throw new Error(
            `Folder create resp is not an object: ${typeof fresp}`
          );
        }
        // Fix #6 — defensive strip
        const createdId = (fresp["folder:id"] ?? "").toString().trim();
        if (!createdId) throw new Error("Folder create resp missing folder:id");
        folderId = createdId;
      } catch (ex) {
        // Re-throw with context so the caller (and AMPP job log) can see it
        throw new Error(
          `Failed to create folder '${fname}' under path '${currentPath}': ${ex.message}`
        );
      }
    }

    parentId = folderId;
  }

  // ── Link asset to deepest folder (fix #5 — throw on failure) ─────────────
  if (parentId) {
    // Compact JSON — same as the IronPython separators=(',',':')
    const linkBody = JSON.stringify(
      { "folder:id": parentId, "asset:id": assetId },
      null,
      0
    );
    // If this throws, the caller sees it — no silent swallow.
    await amppRequest(
      "POST",
      baseUrl,
      token,
      "api/v1/store/folder/references",
      linkBody
    );
  }

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

module.exports = { placeAsset, amppRequest };