/**
 * 移动端同步模块
 */
import { App } from './state.js';
import { ensureSession } from './utils.js';
import { addFileMessage } from './chat.js';
import { checkAutoStart, promptMissingConfig } from './config.js';

export async function generateQr() {
  await ensureSession();
  const mobileUrl = window.location.origin + '/mobile/' + App.sessionId;
  const box = document.getElementById('qrcode');
  box.innerHTML = '';
  new QRCode(box, {
    text: mobileUrl,
    width: 120,
    height: 120,
    colorDark: '#333',
    colorLight: '#fff',
  });
}

export async function startSync() {
  if (App.syncTimer) return;
  await syncFiles();
  App.syncTimer = setInterval(syncFiles, 3000);
}

export function stopSync() {
  if (App.syncTimer) { clearInterval(App.syncTimer); App.syncTimer = null; }
}

async function syncFiles() {
  if (!App.sessionId) return;
  try {
    const r = await fetch(`/api/files/${App.sessionId}`);
    const d = await r.json();
    const serverFiles = d.files || [];
    const serverNames = new Set(serverFiles.map(f => f.name));
    const localNames = new Set(App.allFiles.map(f => f.name));
    const addedFiles = [];

    for (const serverFile of serverFiles) {
      if (!localNames.has(serverFile.name)) {
        const resp = await fetch(`/api/download/${App.sessionId}/${encodeURIComponent(serverFile.name)}`);
        const blob = await resp.blob();
        const file = new File([blob], serverFile.name, { type: blob.type });
        file.__source = 'server';
        App.allFiles.push(file);
        addedFiles.push(serverFile.name);
      }
    }

    for (const f of [...App.allFiles]) {
      if (!serverNames.has(f.name) && f.__source !== 'local') {
        const idx = App.allFiles.indexOf(f);
        if (idx > -1) App.allFiles.splice(idx, 1);
      }
    }

    if (addedFiles.length) {
      addedFiles.forEach(name => addFileMessage(name));
      if (App.processState === 'done') {
        App.processState = 'idle';
        App.newFilenames = addedFiles;
      } else if (App.processState === 'awaiting_supplement') {
        App.processState = 'idle';
        App.newFilenames = addedFiles;
      }
    }

    if (App.allFiles.length) {
      document.getElementById('file-zone').classList.add('active');
    } else {
      document.getElementById('file-zone').classList.remove('active');
    }

    checkAutoStart();
  } catch (e) { /* ignore */ }
}