/**
 * 文件上传模块
 */
import { App } from './state.js';
import { addFileMessage, addChatMessage } from './chat.js';
import { promptMissingConfig, checkAutoStart } from './config.js';
import { handleSupplementUpload, hideAgentRequest } from './agent.js';
import { ensureSession } from './utils.js';

export async function handleFiles(input) {
  const files = Array.from(input.files);
  const result = await _processFiles(files);

  if (result.hasNewFiles && App.processState === 'done') {
    App.processState = 'idle';
    App.newFilenames = result.newFilenames;
  }
  if (result.hasNewFiles && App.processState === 'awaiting_supplement') {
    hideAgentRequest();
    await _uploadNewFiles(result.newFilenames);
    App.newFilenames = result.newFilenames;
    App.processState = 'idle';
    return;
  }

  promptMissingConfig();
  input.value = '';
}

/**
 * 统一文件处理逻辑（handleFiles 和拖拽共享）
 */
async function _processFiles(files) {
  const validExts = /\.(pdf|png|jpe?g|bmp|webp)$/i;
  let hasNewFiles = false;
  const newFilenames = [];

  for (const f of files) {
    if (/\.json$/i.test(f.name)) {
      await parseConfigFile(f);
      continue;
    }
    if (!App.allFiles.find(x => x.name === f.name) && validExts.test(f.name)) {
      f.__source = 'local';
      App.allFiles.push(f);
      document.getElementById('file-zone').classList.add('active');
      addFileMessage(f.name);
      hasNewFiles = true;
      newFilenames.push(f.name);
    }
  }

  return { hasNewFiles, newFilenames };
}

async function _uploadNewFiles(filenames) {
  await ensureSession();
  for (const f of App.allFiles) {
    if (filenames.includes(f.name)) {
      const fd = new FormData();
      fd.append('file', f);
      await fetch(`/api/upload/${App.sessionId}`, { method: 'POST', body: fd });
    }
  }
}

async function parseConfigFile(file) {
  return new Promise((resolve) => {
    const reader = new FileReader();
    reader.onload = function (e) {
      try {
        const cfg = JSON.parse(e.target.result);
        Object.assign(App.sessionConfig, {
          username: cfg.username || '',
          password: cfg.password || '',
          default_name: cfg.default_name || '',
          default_card_no: cfg.default_card_no || '',
          default_person_id: cfg.default_person_id || '',
          consumable_storage: cfg.consumable_storage || '',
        });
        addChatMessage(`config.json 已加载`, 'system');
        resolve(true);
      } catch (err) {
        console.warn('config.json 解析失败:', err.message);
        resolve(false);
      }
    };
    reader.readAsText(file);
  });
}

export function initDragDrop() {
  const zone = document.getElementById('file-zone');
  if (!zone) return;

  zone.addEventListener('dragover', e => { e.preventDefault(); zone.classList.add('dragover'); });
  zone.addEventListener('dragleave', () => zone.classList.remove('dragover'));
  zone.addEventListener('drop', async e => {
    e.preventDefault();
    zone.classList.remove('dragover');
    const droppedFiles = Array.from(e.dataTransfer.files);
    const result = await _processFiles(droppedFiles);

    if (result.hasNewFiles && App.processState === 'done') {
      App.processState = 'idle';
    }

    // 在 awaiting_supplement 状态下，只上传新文件并走 supplement 流程（手动触发）
    if (result.hasNewFiles && App.processState === 'awaiting_supplement') {
      hideAgentRequest();
      await _uploadNewFiles(result.newFilenames);
      App.newFilenames = result.newFilenames;
      App.processState = 'idle';
      return;
    }

    promptMissingConfig();
  });
}

/**
 * 切换上传面板折叠/展开状态
 */
export function toggleUploadPanel() {
  const body = document.getElementById('upload-panel-body');
  const icon = document.getElementById('upload-toggle-icon');
  if (!body || !icon) return;

  body.classList.toggle('collapsed');
  icon.classList.toggle('collapsed');
}