"use strict";

const { placeAssetInFolderById } = require("./ampp-folder-placer");

// ================================================================
//  AMPP Placement Worker — lib/ampp-placement-worker.js
//
//  Runs inside DragonWind as a background setInterval loop.
//  Every POLL_INTERVAL_MS it:
//    1. Finds pending placements in db.pendingPlacements
//    2. Fetches recent completed AMPP ingest jobs
//    3. Matches jobs to placements by filename (broad field search)
//    4. Calls placeAssetInFolderById() with the known folder ID
//    5. Updates placement status in db
//
//  Job field matching:
//    AMPP job field names vary by version.  The worker searches ALL
//    string values in the job object for a match against the filename.
//    It also logs the full key list of the first matched job so you
//    can identify the exact field name and configure ASSET_ID_FIELDS.
//
//  Tune ASSET_ID_FIELDS below once you know your AMPP's field names.
// ================================================================

// Fields to check for the asset:id — in priority order
const ASSET_ID_FIELDS = [
  "asset:id",
  "assetId",
  "job:assetId",
  "asset:uuid",
  "id",
];

// How old a pending placement can be before we give up on it (24h)
const EXPIRY_MS = 24 * 60 * 60 * 1000;

// Default poll interval (overridable via start())
const DEFAULT_POLL_MS = 30_000;

class AmppPlacementWorker {
  /**
   * @param {object} opts
   * @param {() => string}          opts.getAmppBase   — returns current AMPP base URL
   * @param {() => Promise<string>} opts.getAmppToken  — returns valid Bearer token
   * @param {object}                opts.db            — shared db object (mutated in place)
   * @param {() => void}            opts.saveData      — persists db to disk
   */
  constructor({ getAmppBase, getAmppToken, db, saveData }) {
    this._getAmppBase  = getAmppBase;
    this._getAmppToken = getAmppToken;
    this._db           = db;
    this._saveData     = saveData;
    this._timer        = null;
    this._busy         = false;
  }

  start(intervalMs = DEFAULT_POLL_MS) {
    if (this._timer) return; // already running
    this._timer = setInterval(() => this._tick(), intervalMs);
    console.log(`[placement-worker] Started — polling every ${intervalMs / 1000}s`);
    // Run one cycle immediately so the first upload doesn't wait a full interval
    setImmediate(() => this._tick());
  }

  stop() {
    if (this._timer) { clearInterval(this._timer); this._timer = null; }
    console.log("[placement-worker] Stopped");
  }

  // ── Main poll cycle ────────────────────────────────────────────────────────
  async _tick() {
    if (this._busy) return; // skip overlapping runs
    this._busy = true;
    try {
      await this._processPending();
    } catch (err) {
      console.error("[placement-worker] Tick error:", err.message);
    } finally {
      this._busy = false;
    }
  }

  async _processPending() {
    const pending = (this._db.pendingPlacements || []).filter(p => p.status === "waiting");

    // Expire stale placements first (before any API calls)
    let dirty = false;
    for (const p of pending) {
      if (Date.now() - new Date(p.createdAt).getTime() > EXPIRY_MS) {
        p.status = "expired";
        console.warn(`[placement-worker] Expired: ${p.filename} (created ${p.createdAt})`);
        dirty = true;
      }
    }
    if (dirty) this._saveData(this._db);

    const active = pending.filter(p => p.status === "waiting");
    if (!active.length) return;

    console.log(`[placement-worker] ${active.length} pending placement(s) — checking AMPP jobs…`);

    let token, jobs;
    try {
      token = await this._getAmppToken();
      jobs  = await this._fetchRecentJobs(token);
    } catch (err) {
      console.error("[placement-worker] Could not reach AMPP:", err.message);
      return;
    }

    console.log(`[placement-worker] ${jobs.length} recent AMPP job(s) fetched`);

    // Log keys of first job to help identify field names (only once per session)
    if (jobs.length > 0 && !this._loggedJobKeys) {
      console.log("[placement-worker] Sample job keys:", Object.keys(jobs[0]));
      console.log("[placement-worker] Sample job (first 800 chars):", JSON.stringify(jobs[0]).slice(0, 800));
      this._loggedJobKeys = true;
    }

    let changed = false;
    for (const placement of active) {
      const job = this._matchJob(jobs, placement.filename);
      if (!job) continue;

      const assetId = this._extractAssetId(job);
      if (!assetId) {
        console.warn(`[placement-worker] Matched job for '${placement.filename}' but could not extract asset:id. Job keys: ${Object.keys(job).join(", ")}`);
        continue;
      }

      console.log(`[placement-worker] Placing '${placement.filename}' → folder ${placement.amppFolderId} (asset ${assetId})`);
      try {
        await placeAssetInFolderById(this._getAmppBase(), assetId, placement.amppFolderId, token);
        placement.status    = "placed";
        placement.assetId   = assetId;
        placement.placedAt  = new Date().toISOString();
        console.log(`[placement-worker] ✓ Placed '${placement.filename}' in folder '${placement.amppFolderName}'`);
      } catch (err) {
        placement.status = "failed";
        placement.error  = err.message;
        console.error(`[placement-worker] ✗ Failed to place '${placement.filename}':`, err.message);
      }
      changed = true;
    }

    if (changed) this._saveData(this._db);
  }

  // ── Fetch recent AMPP jobs ─────────────────────────────────────────────────
  async _fetchRecentJobs(token) {
    const base = this._getAmppBase();
    const url  = `${base}/api/v1/queue/job/jobs/querypage?skip=0&limit=200&sort=created:dateTime&asc=false`;
    const r = await fetch(url, {
      method: "POST",
      headers: { "Content-Type": "application/json", Authorization: `Bearer ${token}` },
      body: "{}",
      signal: AbortSignal.timeout(15000),
    });
    if (!r.ok) throw new Error(`AMPP jobs query returned HTTP ${r.status}`);
    const data = await r.json();
    return Array.isArray(data) ? data : (data?.items ?? data?.results ?? []);
  }

  // ── Match a job to a filename ──────────────────────────────────────────────
  // Searches ALL string values in the job object — broad but reliable while
  // we don't yet know the exact field name.  Once confirmed, you can tighten
  // this to specific fields for performance.
  _matchJob(jobs, filename) {
    const lc = filename.toLowerCase();
    return jobs.find(job => {
      return Object.values(job).some(v => {
        if (typeof v !== "string") return false;
        const vl = v.toLowerCase();
        // Match exact filename or filename at end of a path/key
        return vl === lc || vl.endsWith("/" + lc) || vl.endsWith("\\" + lc);
      });
    }) ?? null;
  }

  // ── Extract asset ID from a job ────────────────────────────────────────────
  _extractAssetId(job) {
    for (const field of ASSET_ID_FIELDS) {
      const v = job[field];
      if (v && typeof v === "string") return v.trim();
    }
    return null;
  }
}

module.exports = AmppPlacementWorker;