const SETTINGS_KEY = 'webToPPTSettings';
const DEFAULT_SETTINGS = { useProxy: false, concurrency: '8', captureMode: 'mixed', captureWidth: null };
const MIN_CAPTURE_WIDTH = 320;
const MAX_CAPTURE_WIDTH = 3840;

const captureWidthInput = document.getElementById('captureWidth');
const exportBtn = document.getElementById('exportBtn');
const btnText = document.getElementById('btnText');
const status = document.getElementById('status');
const statusText = document.getElementById('statusText');
const progressFill = document.getElementById('progressFill');

function normalizeCaptureWidth(value, fallback = null) {
  const number = Number.parseInt(String(value || '').replace(/\D+/g, ''), 10);
  if (!Number.isFinite(number)) return fallback;
  return Math.max(MIN_CAPTURE_WIDTH, Math.min(MAX_CAPTURE_WIDTH, number));
}

function normalizeSettings(value = {}) {
  return {
    useProxy: Boolean(value.useProxy),
    captureMode: 'mixed',
    captureWidth: normalizeCaptureWidth(value.captureWidth, null)
  };
}

async function getSettings() {
  const result = await chrome.storage.local.get({ [SETTINGS_KEY]: DEFAULT_SETTINGS });
  return normalizeSettings(result[SETTINGS_KEY]);
}

async function getCurrentViewportWidth() {
  try {
    const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
    if (!tab?.id) return null;
    const [{ result }] = await chrome.scripting.executeScript({
      target: { tabId: tab.id },
      func: () => Math.round(window.innerWidth || document.documentElement.clientWidth || 0)
    });
    return normalizeCaptureWidth(result, null);
  } catch { return null; }
}

function setProgress(percent, text) {
  status.hidden = false;
  progressFill.style.width = `${Math.max(0, Math.min(100, percent))}%`;
  statusText.textContent = text;
}

function setBusy(isBusy) {
  exportBtn.disabled = isBusy;
  exportBtn.classList.toggle('loading', isBusy);
  exportBtn.classList.remove('success', 'error');
  btnText.textContent = isBusy ? '处理中...' : '导出 PPTX';
}

function setResult(kind, text) {
  exportBtn.classList.remove('loading', 'success', 'error');
  exportBtn.classList.add(kind);
  btnText.textContent = text;
}

async function exportPptx() {
  setBusy(true);
  setProgress(5, '准备采集...');

  const captureWidth = normalizeCaptureWidth(captureWidthInput.value, null);
  const settings = { ...DEFAULT_SETTINGS, captureWidth };

  try {
    // 1. 抓取 DOM
    setProgress(15, '正在采集页面...');
    const response = await chrome.runtime.sendMessage({
      type: 'WEB_TO_PPT_CAPTURE_START',
      options: settings
    });

    if (!response || !response.ok) {
      throw new Error(response?.error || '采集失败');
    }

    // 2. 获取 JSON 数据（从 background 返回的文件路径读取不了，直接从 background 拿数据）
    // 需要让 background 返回 JSON 数据而不是文件
    setProgress(40, '采集完成，正在转化...');

    // background 已经下载了 JSON 文件，但我们需要数据来转化
    // 用另一个消息获取数据
    const dataResponse = await chrome.runtime.sendMessage({
      type: 'WEB_TO_PPT_GET_DATA'
    });

    if (!dataResponse || !dataResponse.ok) {
      throw new Error(dataResponse?.error || '获取数据失败');
    }

    const jsonData = dataResponse.data;

    // 3. 转化
    setProgress(50, '正在生成 PPTX...');
    const schema = await WebToPPT.convertToPptx(jsonData, (msg) => {
      setProgress(50 + Math.min(40, Math.floor(Math.random() * 40)), msg);
    });

    // 4. 生成 PPTX
    setProgress(90, '正在打包...');
    const blob = await WebToPPT.schemaToPptxBlob(schema);

    // 5. 下载（弹出保存对话框）
    setProgress(95, '正在下载...');
    const url = URL.createObjectURL(blob);
    const title = jsonData.source?.title || 'webpage';
    const safeTitle = title.replace(/[\\/:*?"<>|]+/g, '-').replace(/\s+/g, '-').slice(0, 64) || 'webpage';
    const filename = `web-to-ppt/${safeTitle}-${Date.now()}.pptx`;

    await chrome.downloads.download({ url, filename, saveAs: true });
    setTimeout(() => URL.revokeObjectURL(url), 60000);

    setProgress(100, `已导出：${filename}`);
    setResult('success', '导出完成');
    // 不自动关闭 popup，等用户选完保存位置

  } catch (error) {
    setProgress(0, error.message || String(error));
    setResult('error', '导出失败');
    setTimeout(() => {
      setBusy(false);
      status.hidden = true;
      progressFill.style.width = '0';
    }, 3000);
  }
}

// 初始化
document.addEventListener('DOMContentLoaded', async () => {
  const currentWidth = await getCurrentViewportWidth();
  captureWidthInput.value = String(currentWidth || '');
});

exportBtn.addEventListener('click', exportPptx);
captureWidthInput.addEventListener('input', () => {
  captureWidthInput.value = captureWidthInput.value.replace(/\D+/g, '');
});