'use strict';

/**
 * 题号任务进度上报器（live 模式生命周期打点 + 七牛产物上传）。
 *
 * - 上报目标：FMode 云函数 tihao-task-progress（action=report），看板据此聚合「人×任务×进度」。
 * - 产物：原始 brief（文件原样或文本转 .md）与最终结果 CSV，经 09-uploadManager 直传七牛，URL 落到任务记录。
 * - 全程静默容错：拿不到 sessionToken、上传失败、上报失败都不抛错、不阻断出名单。
 *
 * 关闭：input.reportProgress === false / input.noProgress === true / 环境变量 TIHAO_PROGRESS_DISABLED=1。
 */

const fs = require('fs');
const path = require('path');
const { readTihaoToken } = require('../../core/credentials');

const PARSE_HOST = (env('TIHAO_PROGRESS_HOST') || env('PARSE_BASE_URL') || 'https://server.fmode.cn').replace(/\/+$/, '');
const FUNCTIONS_URL = `${PARSE_HOST}/api/functions`;
const PARSE_APP_ID = env('TIHAO_PARSE_APP_ID') || env('PARSE_APP_ID') || 'ncloudmaster';
const PROGRESS_FN_ID = env('TIHAO_PROGRESS_FN_ID') || 'WrdzmO5fqr';
const UPLOAD_FN_ID = env('TIHAO_UPLOAD_FN_ID') || 'VHS0noRP7Q'; // 09-uploadManager
const BRIEF_PREVIEW_LIMIT = 4000;
const CALL_TIMEOUT_MS = 20000;
const CALL_RETRIES = 6;

function env(name) {
  return typeof process !== 'undefined' && process.env ? process.env[name] : undefined;
}

function isEnabled(input) {
  if (input && (input.reportProgress === false || input.noProgress === true)) return false;
  if (env('TIHAO_PROGRESS_DISABLED') === '1') return false;
  return true;
}

function createReporter(input = {}, context = {}) {
  const sessionToken = isEnabled(input) ? String(readTihaoToken(input) || '').trim() : '';
  const outputDir = context.outputDir || input.output || input.outputDir || '';
  const taskId = String(
    input.taskId || input.progressTaskId ||
    (outputDir ? path.basename(outputDir) : '') ||
    `tihao-${Date.now()}`
  ).trim();
  const active = Boolean(sessionToken);
  return new ProgressReporter({ sessionToken, taskId, active });
}

class ProgressReporter {
  constructor({ sessionToken, taskId, active }) {
    this.sessionToken = String(sessionToken || '');
    this.taskId = taskId;
    this.active = active;
    this.title = '';
    this.briefUploaded = false;
  }

  async start(criteria = {}, input = {}) {
    if (!this.active) return;
    this.title = buildTitle(criteria, input, this.taskId);
    const artifacts = {};
    try {
      const brief = await this.uploadBrief(criteria, input);
      Object.assign(artifacts, brief);
    } catch (_) { /* 静默 */ }
    await this.report({
      status: 'running',
      progress: 5,
      title: this.title,
      type: 'tihao_sourcing',
      step: { key: 'start', label: '开始提号', at: now() },
      data: { artifacts },
    });
  }

  async step(key, label, progress) {
    if (!this.active) return;
    await this.report({
      status: 'running',
      progress,
      step: { key, label, at: now() },
    });
  }

  async complete(report = {}) {
    if (!this.active) return;
    const artifacts = {};
    try {
      Object.assign(artifacts, await this.uploadResults(report.files || []));
    } catch (_) { /* 静默 */ }
    await this.report({
      status: 'completed',
      progress: 100,
      step: { key: 'done', label: '已完成', at: now() },
      data: {
        artifacts,
        summary: pickSummary(report.summary),
      },
    });
  }

  async blocked(status, message, progress) {
    if (!this.active) return;
    await this.report({
      status: status || 'blocked',
      progress: typeof progress === 'number' ? progress : 50,
      step: { key: 'blocked', label: message || '已暂停', at: now() },
      data: { note: message || '' },
    });
  }

  async fail(error) {
    if (!this.active) return;
    const message = error && error.message ? error.message : String(error || '未知错误');
    await this.report({
      status: 'failed',
      step: { key: 'failed', label: '执行失败', at: now() },
      data: { error: message.slice(0, 500) },
    });
  }

  /* --------------------------- 内部 --------------------------- */

  async report(payload) {
    try {
      await callFunction({
        id: PROGRESS_FN_ID,
        action: 'report',
        sessionToken: String(this.sessionToken || ''),
        taskId: this.taskId,
        ...payload,
      });
    } catch (_) { /* 静默：上报失败不阻断 */ }
  }

  async uploadBrief(criteria = {}, input = {}) {
    const source = criteria.source || input.brief || input.briefPath || '';
    const rawText = String(criteria.rawText || '').trim();

    // 1) 真实文件 brief：原样上传
    if (source && source !== 'inline' && source !== 'input') {
      const filePath = path.resolve(source);
      if (fs.existsSync(filePath) && fs.statSync(filePath).isFile()) {
        const buffer = fs.readFileSync(filePath);
        const name = path.basename(filePath);
        const url = await this.uploadBuffer(buffer, name, mimeOf(name));
        const out = { briefUrl: url, briefName: name };
        if (rawText) out.briefPreview = truncate(rawText, BRIEF_PREVIEW_LIMIT);
        this.briefUploaded = Boolean(url);
        return out;
      }
    }

    // 2) 文本 brief：转 .md 上传 + 预览入库
    if (rawText) {
      const name = `brief-${this.taskId}.md`;
      const url = await this.uploadBuffer(Buffer.from(rawText, 'utf8'), name, 'text/markdown');
      this.briefUploaded = Boolean(url);
      return { briefUrl: url, briefName: name, briefPreview: truncate(rawText, BRIEF_PREVIEW_LIMIT) };
    }
    return {};
  }

  async uploadResults(files = []) {
    const out = {};
    const csv = files.find((f) => String(f).toLowerCase().endsWith('.csv'));
    if (csv && fs.existsSync(csv)) {
      const name = path.basename(csv);
      const url = await this.uploadBuffer(fs.readFileSync(csv), name, 'text/csv');
      if (url) { out.resultCsvUrl = url; out.resultCsvName = name; }
    }
    const md = files.find((f) => String(f).toLowerCase().endsWith('.md'));
    if (md && fs.existsSync(md)) {
      const name = path.basename(md);
      const url = await this.uploadBuffer(fs.readFileSync(md), name, 'text/markdown');
      if (url) { out.reportUrl = url; out.reportName = name; }
    }
    return out;
  }

  async uploadBuffer(buffer, filename, mimeType) {
    if (!buffer || !buffer.length) return '';
    const tokenResp = await callFunction({
      id: UPLOAD_FN_ID,
      action: 'createUploadToken',
      sessionToken: String(this.sessionToken || ''),
      filename,
      mimeType,
      kind: 'export',
      size: buffer.length,
      bizId: this.taskId,
    });
    const data = (tokenResp && tokenResp.data) || {};
    if (!data.uploadUrl || !data.token || !data.key) return '';

    const form = new FormData();
    form.append('key', data.key);
    form.append('token', data.token);
    form.append('file', new Blob([buffer], { type: mimeType }), filename);

    const controller = new AbortController();
    const timer = setTimeout(() => controller.abort(), CALL_TIMEOUT_MS);
    try {
      const resp = await fetch(data.uploadUrl, { method: 'POST', body: form, signal: controller.signal });
      if (!resp.ok) return '';
      return data.url || '';
    } finally {
      clearTimeout(timer);
    }
  }
}

async function callFunction(body) {
  let lastErr;
  for (let attempt = 0; attempt < CALL_RETRIES; attempt += 1) {
    const controller = new AbortController();
    const timer = setTimeout(() => controller.abort(), CALL_TIMEOUT_MS);
    try {
      const resp = await fetch(FUNCTIONS_URL, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
          'X-Parse-Application-Id': PARSE_APP_ID,
          'X-Parse-Session-Token': body.sessionToken || '',
        },
        body: JSON.stringify({ ...body, _ApplicationId: PARSE_APP_ID }),
        signal: controller.signal,
      });
      const text = await resp.text();
      const json = safeJson(text);
      // FMode 偶发空响应 / fetch failed（云函数内部解析登录态抖动）→ 重试
      const fetchFailed = json && typeof json.message === 'string' && /fetch failed/i.test(json.message);
      const retryable = !resp.ok || !json || fetchFailed || Number(json.code) >= 500;
      if (retryable) {
        lastErr = new Error((json && (json.message || json.error)) || `empty response (http ${resp.status})`);
      } else {
        return json;
      }
    } catch (err) {
      lastErr = err;
    } finally {
      clearTimeout(timer);
    }
    await sleep(800 * (attempt + 1));
  }
  throw lastErr || new Error('callFunction failed');
}

function buildTitle(criteria = {}, input = {}, taskId) {
  const brand = String(criteria.brand || input.brand || '').trim();
  const keywords = Array.isArray(criteria.keywords) ? criteria.keywords.filter(Boolean) : [];
  const kw = keywords.slice(0, 3).join('、');
  if (brand && kw) return `${brand} · ${kw}`;
  if (brand) return brand;
  if (kw) return kw;
  return `提号任务 ${taskId}`;
}

function pickSummary(summary = {}) {
  if (!summary || typeof summary !== 'object') return {};
  const keys = ['brand', 'collectionMode', 'total', 'strong', 'backup', 'review', 'clientReadyCount', 'targetCount'];
  const out = {};
  for (const key of keys) if (summary[key] !== undefined) out[key] = summary[key];
  return out;
}

function mimeOf(name) {
  const ext = String(name || '').toLowerCase().split('.').pop();
  return {
    md: 'text/markdown', txt: 'text/plain', csv: 'text/csv', json: 'application/json',
    xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    xls: 'application/vnd.ms-excel',
    docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    doc: 'application/msword', pdf: 'application/pdf',
  }[ext] || 'application/octet-stream';
}

function truncate(text, limit) {
  const value = String(text || '');
  return value.length > limit ? `${value.slice(0, limit)}\n…(已截断)` : value;
}

function safeJson(text) {
  try { return JSON.parse(text); } catch { return null; }
}

function now() {
  return new Date().toISOString();
}

function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

module.exports = { createReporter, ProgressReporter };