'use strict';

const fs = require('fs');
const path = require('path');

const sleep = ms => new Promise(r => setTimeout(r, ms));
const tsNow = () => new Date().toISOString().replace('T', ' ').slice(0, 19);
const log = (tag, msg) => console.log(`[${tsNow()}] [MEMORY] ${tag}  ${msg}`);

const _sanitizeName = name => name.replace(/[^a-zA-Z0-9\-_.]/g, '-').replace(/^-+|-+$|\.git$|\.ipynb$/g, '') || 'sayed-bot-data';
const $O = () => process.env.HF_USER || '';
const $N = () => _sanitizeName(process.env.DATASET_NAME || 'sayed-bot-data');
const $T = () => process.env.HF_TOKEN || '';
const $remote = () => !!($O() && $T());

const AUTO_FILES = ['logs.txt', 'bot-state.json', 'memory.json'];

const INITIAL_SETTINGS = { host: '', port: 25565, version: 'auto', botCount: 3, owner: '', autoReconnect: true, language: 'ar', optimizationCycleSec: 30, saveIntervalMin: 5, dashboardPort: 7860 };
const INITIAL_NAMES = { names: ['Alex_miner26', 'Steve_builder', 'NightExplorer', 'RedstoneKing'], count: 3, suffix: '' };

class MemoryStore {
  constructor() {
    this._cache = {};
    this._ready = false;
    this._lastWriteTime = null;
    this._writtenFiles = new Set();
    this._initDone = false;
    this._remoteEnsured = false;
    this._ensuringDataset = null;
    this._datasetReady = false;
    this._remoteFailCount = 0;
    this._remoteFailTime = 0;
    if ($remote()) {
      log('☁️', `HF Dataset: ${$O()}/${$N()}`);
    } else {
      log('📁', 'وضع محلي — حفظ محلي');
    }
    this._cache.settings = INITIAL_SETTINGS;
    this._ready = true;
    this._initDone = true;
    if ($remote()) {
      this._ensureDatasetQuiet().then(ok => {
        if (ok) log('✅', 'Dataset جاهز');
      });
    }
  }

  get _localMode() { return !$remote(); }

  async _ensureDatasetQuiet() {
    if (this._datasetReady) return true;
    if (this._ensuringDataset) return this._ensuringDataset;
    this._ensuringDataset = this._ensureDatasetInternal();
    const result = await this._ensuringDataset;
    this._ensuringDataset = null;
    return result;
  }

  async _ensureRepoInit(owner, name, token) {
    for (let attempt = 0; attempt < 3; attempt++) {
      try {
        const resp = await fetch(`https://huggingface.co/api/datasets/${owner}/${name}/commit/main`, {
          method: 'POST',
          headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json', 'User-Agent': 'sayed-bot/1.0' },
          body: JSON.stringify({ files: [{ path: '.gitkeep', content: '' }], summary: 'init' }),
          signal: AbortSignal.timeout(30000),
        });
        if (resp.ok) { log('✅', 'تم تهيئة الـ Repo (main branch)'); return true; }
        if (resp.status === 404 && attempt < 2) {
          await sleep(10000 * (attempt + 1));
          continue;
        }
        if (attempt < 2) { await sleep(5000); continue; }
        log('⚠️', `فشل init: HTTP ${resp.status}`);
        return false;
      } catch (e) {
        if (e.name !== 'AbortError') log('⚠️', `init error: ${e.message}`);
        if (attempt < 2) { await sleep(5000); continue; }
        return false;
      }
    }
    return false;
  }

  async _ensureDatasetInternal() {
    const owner = $O(), name = $N(), token = $T();
    if (!owner || !token) return false;

    for (let attempt = 0; attempt < 3; attempt++) {
      try {
        const checkResp = await fetch(`https://huggingface.co/api/datasets/${owner}/${name}`, {
          headers: { 'User-Agent': 'sayed-bot/1.0', 'Authorization': `Bearer ${token}` },
          signal: AbortSignal.timeout(15000),
        });
        if (checkResp.ok) {
          // Dataset موجود — نتأكد إنه مش فاضي
          const data = await checkResp.json().catch(() => ({}));
          const siblings = data.siblings || [];
          if (siblings.length === 0) {
            log('⚠️', 'Dataset موجود لكن فاضي — جاري init...');
            await sleep(5000);
            const initOk = await this._ensureRepoInit(owner, name, token);
            if (!initOk) { if (attempt < 2) { await sleep(5000); continue; } return false; }
          }
          this._datasetReady = true;
          return true;
        }
        if (checkResp.status !== 404) {
          log('⚠️', `التحقق من Dataset: HTTP ${checkResp.status}`);
          if (attempt < 2) { await sleep(3000 * (attempt + 1)); continue; }
          return false;
        }
      } catch (e) {
        if (e.name === 'AbortError') { log('⚠️', 'مهلة التحقق من Dataset'); if (attempt < 2) { await sleep(3000); continue; } return false; }
        log('⚠️', `خطأ في التحقق: ${e.message}`);
        if (attempt < 2) { await sleep(3000); continue; }
        return false;
      }

      log('🔄', `إنشاء Dataset: ${owner}/${name}...`);
      try {
        const createResp = await fetch('https://huggingface.co/api/repos/create', {
          method: 'POST',
          headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json', 'User-Agent': 'sayed-bot/1.0' },
          body: JSON.stringify({ type: 'dataset', name }),
          signal: AbortSignal.timeout(30000),
        });
        if (createResp.ok || createResp.status === 409) {
          log('✅', `تم إنشاء Dataset: ${owner}/${name}`);
          await sleep(15000);
          const initOk = await this._ensureRepoInit(owner, name, token);
          if (initOk) {
            this._datasetReady = true;
            return true;
          }
          log('⚠️', 'فشلت تهيئة الـ Dataset بعد 3 محاولات');
          if (attempt < 2) { await sleep(10000); continue; }
          return false;
        }
        const errText = await createResp.text().catch(() => '');
        log('⚠️', `فشل إنشاء Dataset: HTTP ${createResp.status}: ${errText.slice(0, 200)}`);
        if (attempt < 2) { await sleep(5000); continue; }
        return false;
      } catch (e) {
        if (e.name === 'AbortError') { log('⚠️', 'مهلة إنشاء Dataset'); if (attempt < 2) { await sleep(5000); continue; } return false; }
        log('⚠️', `خطأ في إنشاء Dataset: ${e.message}`);
        if (attempt < 2) { await sleep(5000); continue; }
        return false;
      }
    }
    return false;
  }

  async _getFileList() {
    const owner = $O(), name = $N(), token = $T();
    for (let attempt = 0; attempt < 3; attempt++) {
      try {
        const resp = await fetch(`https://huggingface.co/api/datasets/${owner}/${name}`, {
          headers: { 'User-Agent': 'sayed-bot/1.0', 'Authorization': `Bearer ${token}` },
          signal: AbortSignal.timeout(15000),
        });
        if (!resp.ok) { if (attempt < 2) { await sleep(3000); continue; } return new Set(); }
        const data = await resp.json();
        if (!data.siblings || !Array.isArray(data.siblings)) return new Set();
        return new Set(data.siblings.map(s => s.rfilename));
      } catch (e) {
        if (attempt < 2) { await sleep(3000); continue; }
        return new Set();
      }
    }
    return new Set();
  }

  async read(filename) {
    if (this._localMode) { return this._readLocal(filename); }
    return this._readRemote(filename);
  }

  async write(filename, data) {
    if (this._localMode) { return this._writeLocal(filename, data); }

    if (!this._datasetReady) {
      const ok = await this._ensureDatasetQuiet();
      if (!ok) {
        log('⚠️', 'لا يمكن الوصول للـ Dataset — حفظ محلي');
        return this._writeLocal(filename, data);
      }
    }

    if (this._remoteFailCount > 5 && (Date.now() - this._remoteFailTime) < 300000) {
      return this._writeLocal(filename, data);
    }
    for (let i = 0; i < 3; i++) {
      const ok = await this._writeRemote(filename, data);
      if (ok) { this._remoteFailCount = 0; return true; }
      if (i < 2) await sleep(3000 * (i + 1));
    }
    this._remoteFailCount = (this._remoteFailCount || 0) + 1;
    this._remoteFailTime = Date.now();
    log('⚠️', `فشلت 3 محاولات لرفع ${filename} — حفظ محلي`);
    return this._writeLocal(filename, data);
  }

  async _readLocal(filename) {
    try {
      const p = path.join(__dirname, filename);
      if (!fs.existsSync(p)) return null;
      const raw = fs.readFileSync(p, 'utf8');
      if (filename.endsWith('.json')) return JSON.parse(raw);
      return raw;
    } catch(e) {
      log('⚠️', `قراءة محلية فاشلة ${filename}: ${e.message}`);
      return null;
    }
  }

  async _writeLocal(filename, data) {
    try {
      const p = path.join(__dirname, filename);
      const content = typeof data === 'string' ? data : JSON.stringify(data, null, 2);
      fs.writeFileSync(p, content, 'utf8');
      this._lastWriteTime = Date.now();
      this._writtenFiles.add(filename);
      log('💾', `محلي: ${filename} — ${content.length}B`);
      return true;
    } catch(e) {
      log('❌', `كتابة محلية فاشلة ${filename}: ${e.message}`);
      return false;
    }
  }

  async _readRemote(filename) {
    const owner = $O(), name = $N();
    const urls = [
      `https://huggingface.co/datasets/${owner}/${name}/raw/main/${filename}`,
      `https://huggingface.co/api/datasets/${owner}/${name}/raw/main/${filename}`,
    ];
    for (const url of urls) {
      try {
        const resp = await fetch(url, {
          headers: { 'User-Agent': 'sayed-bot/1.0' },
          signal: AbortSignal.timeout(15000),
        });
        if (resp.ok) {
          const text = await resp.text();
          if (filename.endsWith('.json')) return JSON.parse(text);
          return text;
        }
      } catch (_) {}
    }
    return null;
  }

  async _writeRemote(filename, data) {
    const token = $T(), owner = $O(), name = $N();
    if (!token) {
      log('⚠️', 'HF_TOKEN غير موجود — حفظ محلي');
      return this._writeLocal(filename, data);
    }
    const content = typeof data === 'string' ? data : JSON.stringify(data, null, 2);

    // === المحاولة 1: Commit API ===
    {
      const commitBody = {
        files: [{ path: filename, content: Buffer.from(content, 'utf8').toString('base64') }],
        summary: `Auto-save ${filename} by Sayed Bot`,
      };
      try {
        const resp = await fetch(`https://huggingface.co/api/datasets/${owner}/${name}/commit/main`, {
          method: 'POST',
          headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json', 'User-Agent': 'sayed-bot/1.0' },
          body: JSON.stringify(commitBody),
          signal: AbortSignal.timeout(60000),
        });
        if (resp.ok) {
          log('☁️', `${filename} → ${content.length}B (commit)`);
          this._lastWriteTime = Date.now(); this._writtenFiles.add(filename);
          return true;
        }
        if (resp.status === 401) {
          log('❌', `رفع فاشل ${filename}: HTTP 401 — تأكد من HF_TOKEN`);
          return false;
        }
        if (resp.status !== 404 && resp.status !== 400) {
          log('❌', `رفع فاشل ${filename}: HTTP ${resp.status}`);
          return false;
        }
      } catch (e) {
        if (e.name !== 'AbortError') log('⚠️', `commit: ${e.message}`);
      }
    }

    // === المحاولة 2: Raw PUT (مسارات مختلفة) ===
    {
      const putUrls = [
        `https://huggingface.co/api/datasets/${owner}/${name}/raw/main/${filename}`,
        `https://huggingface.co/datasets/${owner}/${name}/raw/main/${filename}`,
      ];
      for (const putUrl of putUrls) {
        try {
          const rawResp = await fetch(putUrl, {
          method: 'PUT',
          headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/octet-stream', 'User-Agent': 'sayed-bot/1.0' },
          body: Buffer.from(content, 'utf8'),
          signal: AbortSignal.timeout(60000),
        });
        if (rawResp.ok) {
          log('☁️', `${filename} → ${content.length}B (raw PUT)`);
          this._lastWriteTime = Date.now(); this._writtenFiles.add(filename);
          return true;
        }
        if (rawResp.status !== 404 && rawResp.status !== 400) {
          log('❌', `رفع raw فاشل ${filename}: HTTP ${rawResp.status}`);
          return false;
        }
      } catch (e) {
        if (e.name !== 'AbortError') log('⚠️', `raw PUT: ${e.message}`);
      }
      }
    }

    // === المحاولة 3: إعادة init الـ repo و commit ===
    {
      log('🔄', `محاولة إعادة init الـ repo لـ ${filename}...`);
      const initOk = await this._ensureRepoInit(owner, name, token);
      if (initOk) {
        try {
          const resp = await fetch(`https://huggingface.co/api/datasets/${owner}/${name}/commit/main`, {
            method: 'POST',
            headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json', 'User-Agent': 'sayed-bot/1.0' },
            body: JSON.stringify({
              files: [{ path: filename, content: Buffer.from(content, 'utf8').toString('base64') }],
              summary: `Auto-save ${filename} by Sayed Bot`,
            }),
            signal: AbortSignal.timeout(60000),
          });
          if (resp.ok) {
            log('☁️', `${filename} → ${content.length}B (after init)`);
            this._lastWriteTime = Date.now(); this._writtenFiles.add(filename);
            return true;
          }
        } catch (_) {}
      }
    }

    log('❌', `جميع طرق الرفع فشلت لـ ${filename} — حفظ محلي`);
    return false;
  }

  isReady() { return this._ready; }
  isLocal() { return this._localMode; }
  getStatus() {
    return {
      connected: $remote() && this._datasetReady,
      local: this._localMode,
      ready: this._ready,
      lastWrite: this._lastWriteTime,
      files: Array.from(this._writtenFiles),
      datasetOwner: $O(),
      datasetName: $N(),
      hasToken: !!$T(),
    };
  }

  getSettings() { return this._cache.settings || {}; }

  async saveBotState(state) { this._enqueueWrite('bot-state.json', state); }
  async saveMemory(memory) { this._enqueueWrite('memory.json', memory); }

  async appendLog(line) {
    const existing = (await this.read('logs.txt')) || '';
    const updated = (existing + '\n' + line).slice(-50000);
    this._enqueueWrite('logs.txt', updated);
  }

  _enqueueWrite(filename, data) {
    if (!this._writeQueue) this._writeQueue = {};
    if (!this._flushTimer) {
      this._flushTimer = setTimeout(() => this._flushQueue(), 30000);
    }
    this._writeQueue[filename] = data;
  }

  async _flushQueue() {
    this._flushTimer = null;
    const queue = this._writeQueue || {};
    this._writeQueue = {};
    for (const [filename, data] of Object.entries(queue)) {
      await this.write(filename, data);
    }
  }
}

module.exports = { MemoryStore, INITIAL_SETTINGS, INITIAL_NAMES };