'use strict';

const BUSINESS_SOURCE = 'LIANSYN_PLATFORM';
const EXTENSION_SOURCE = 'LTJT_ORDER_ASSISTANT_EXTENSION';
const PRODUCTION_PLATFORM_ORIGIN = 'https://lwlt.nianxx.cn';

const $ = (selector) => document.querySelector(selector);

function setText(selector, text) {
  const el = $(selector);
  if (el) el.textContent = text;
}

function setBadge(text, mode = '') {
  const badge = $('#stateBadge');
  if (!badge) return;
  badge.textContent = text;
  badge.classList.toggle('bad', mode === 'bad');
  badge.classList.toggle('paused', mode === 'paused');
}

function isBusinessSystemUrl(url) {
  try {
    const parsed = new URL(String(url || ''));
    if (parsed.origin === PRODUCTION_PLATFORM_ORIGIN) return true;
    return parsed.protocol === 'http:'
      && ['localhost', '127.0.0.1'].includes(parsed.hostname)
      && ['', '8765', '8786'].includes(parsed.port);
  } catch (error) {
    return false;
  }
}

function friendlyError(error) {
  const message = error?.message || String(error || '');
  if (/Extension context invalidated/i.test(message)) {
    return '插件刚重新加载，旧页面桥接已失效。请刷新业务系统页面后重新打开本面板。';
  }
  return message;
}

async function findBusinessTab() {
  const tabs = await chrome.tabs.query({});
  return tabs.find((tab) => isBusinessSystemUrl(tab.url)) || null;
}

async function pingBusinessBridge(tabId) {
  await chrome.scripting.executeScript({
    target: { tabId },
    files: ['business-bridge.js']
  });

  const [probe] = await chrome.scripting.executeScript({
    target: { tabId },
    func: async (businessSource, extensionSource) => {
      const requestId = `POPUP-PING-${Date.now()}-${Math.random().toString(16).slice(2)}`;
      return new Promise((resolve) => {
        let staleError = null;
        const timer = window.setTimeout(() => {
          window.removeEventListener('message', onMessage);
          resolve(staleError || {
            ok: false,
            message: '业务系统页面未收到插件桥接响应。'
          });
        }, 1500);

        function onMessage(event) {
          if (event.source !== window) return;
          const message = event.data || {};
          if (message.source !== extensionSource || message.requestId !== requestId) return;
          if (message.type === 'ERROR') {
            const errorMessage = String(message.payload?.message || '');
            if (/Extension context invalidated/i.test(errorMessage)) {
              // An extension reload can leave old content-script handlers in the
              // page. Keep waiting for the current bridge's valid PONG.
              staleError = { ok: false, message: errorMessage };
              return;
            }
          }
          if (message.type !== 'PONG' || message.payload?.ok === false) return;
          window.clearTimeout(timer);
          window.removeEventListener('message', onMessage);
          resolve(message.payload || { ok: false, message: '插件桥接返回为空。' });
        }

        window.addEventListener('message', onMessage);
        window.postMessage({
          source: businessSource,
          requestId,
          type: 'PING',
          payload: {}
        }, window.location.origin);
      });
    },
    args: [BUSINESS_SOURCE, EXTENSION_SOURCE]
  });

  return probe?.result || {
    ok: false,
    message: '无法读取业务系统桥接检测结果。'
  };
}

async function detectBusinessConnection() {
  const tab = await findBusinessTab();
  if (!tab?.id) {
    return {
      connected: false,
      bridge: null,
      text: '未打开业务系统页面',
      hint: '请打开生产控制平面或 http://127.0.0.1:8786/，然后刷新本面板。'
    };
  }

  try {
    const bridge = await pingBusinessBridge(tab.id);
    if (!bridge.ok) {
      return {
        connected: false,
        bridge,
        text: '业务系统未联通',
        hint: bridge.message || '插件桥接未响应。'
      };
    }
    return {
      connected: true,
      bridge,
      text: '已联通',
      hint: '业务系统页面已收到插件桥接响应。'
    };
  } catch (error) {
    return {
      connected: false,
      bridge: null,
      text: '业务系统未联通',
      hint: friendlyError(error)
    };
  }
}

async function readAutomationEnabled() {
  const saved = await chrome.storage.local.get('erpAutomationEnabled');
  return saved.erpAutomationEnabled !== false;
}

async function readKeepaliveEnabled() {
  const saved = await chrome.storage.local.get('erpKeepaliveEnabled');
  return saved.erpKeepaliveEnabled !== false;
}

function keepaliveStatusText(connection, automationEnabled, userEnabled) {
  if (!automationEnabled) return '随“允许插件操作 ERP”关闭。';
  if (!userEnabled) return '已关闭；插件不会发送待机保活请求。';
  const keepalive = connection.bridge?.erp_session?.erp_keepalive;
  if (['scheduled', 'already_running', 'running'].includes(keepalive?.recovery_status)) {
    return '检测到 ERP 链路异常，正在刷新现有 ERP 页面并进行只读复测。';
  }
  if (keepalive?.recovery_status === 'success' && keepalive.last_recovered_at) {
    return `已自动刷新并恢复 ERP 链路：${new Date(keepalive.last_recovered_at).toLocaleString()}`;
  }
  if (keepalive?.recovery_status === 'failed' && keepalive.recovery_error) {
    return `ERP 链路异常，已尝试刷新但仍未恢复：${keepalive.recovery_error}。`;
  }
  if (keepalive?.last_status === 'success' && keepalive.last_success_at) {
    return `已开启；最近一次成功：${new Date(keepalive.last_success_at).toLocaleString()}`;
  }
  if (keepalive?.last_status === 'session_expired') return '已开启，但最近一次检测发现 ERP 会话已失效，请重新登录。';
  if (keepalive?.last_status === 'failed') return `已开启；最近一次检测失败：${keepalive.last_error || '网络或页面不可用'}。`;
  return '已开启；约每 5 分钟发送一次只读请求，不刷新当前页面。';
}

async function updateStatusPanel() {
  setBadge('检测中');
  setText('#versionLabel', `v${chrome.runtime.getManifest().version}`);

  const [enabled, keepaliveEnabled, connection] = await Promise.all([
    readAutomationEnabled(),
    readKeepaliveEnabled(),
    detectBusinessConnection()
  ]);

  const toggle = $('#erpAutomationToggle');
  if (toggle) toggle.checked = enabled;
  const keepaliveToggle = $('#erpKeepaliveToggle');
  if (keepaliveToggle) {
    keepaliveToggle.checked = keepaliveEnabled;
    keepaliveToggle.disabled = !enabled;
  }
  setText('#keepaliveText', keepaliveStatusText(connection, enabled, keepaliveEnabled));

  if (!enabled) {
    setBadge('已关闭', 'paused');
    setText('#connectionText', connection.connected ? '已联通，ERP 操作已关闭' : '未联通，ERP 操作已关闭');
    setText('#connectionHint', connection.connected
      ? '业务系统已连接；插件不会打开、填写或提交 ERP。'
      : connection.hint);
    return;
  }

  setBadge(connection.connected ? '已联通' : '未联通', connection.connected ? '' : 'bad');
  setText('#connectionText', connection.connected ? '已联通，ERP 操作已开启' : connection.text);
  setText('#connectionHint', connection.connected
    ? '插件允许操作 ERP。任务创建和进度跟踪请在业务系统中完成。'
    : connection.hint);
}

document.addEventListener('DOMContentLoaded', async () => {
  const toggle = $('#erpAutomationToggle');
  if (toggle) {
    toggle.checked = await readAutomationEnabled();
    toggle.addEventListener('change', async (event) => {
      await chrome.storage.local.set({ erpAutomationEnabled: event.currentTarget.checked });
      await updateStatusPanel();
    });
  }

  const keepaliveToggle = $('#erpKeepaliveToggle');
  if (keepaliveToggle) {
    keepaliveToggle.checked = await readKeepaliveEnabled();
    keepaliveToggle.addEventListener('change', async (event) => {
      await chrome.storage.local.set({ erpKeepaliveEnabled: event.currentTarget.checked });
      await updateStatusPanel();
    });
  }

  await updateStatusPanel();
  window.setTimeout(() => updateStatusPanel().catch(() => {}), 800);
});