/**
 * SDF1 App Shell
 * — 启动 → 闪屏 → 加载 WebView → 错误重试
 */

(function () {
  'use strict';

  var MAIN_URL = 'https://caoyuan.ypshidifu.cn/plugin/player.php';
  var SPLASH_MIN_DURATION = 2800; // 闪屏最少展示 2.8 秒

  var splash    = document.getElementById('splash');
  var errorPage = document.getElementById('error-page');
  var retryBtn  = document.getElementById('retry-btn');
  var webview   = document.getElementById('main-webview');
  var bottomBar = document.getElementById('bottom-bar');

  var appReady = false;
  var startTime = Date.now();

  /* -------------------------------------------
     1. 检测网络
  ------------------------------------------- */
  function checkNetwork(callback) {
    if (navigator.connection) {
      var conn = navigator.connection;
      if (conn.type === 'none' || conn.effectiveType === 'none') {
        return callback(false);
      }
    }
    // 简易 fetch 探测
    fetch(MAIN_URL, { method: 'HEAD', mode: 'no-cors', cache: 'no-store' })
      .then(function () { callback(true); })
      .catch(function () { callback(false); });
  }

  /* -------------------------------------------
     2. 初始化 WebView（HTML5+ 环境）
  ------------------------------------------- */
  function initPlusWebView() {
    if (typeof plus === 'undefined') {
      // 浏览器调试模式：用 iframe 代替
      var iframe = document.createElement('iframe');
      iframe.src = MAIN_URL;
      iframe.style.cssText = 'width:100%;height:100%;border:none;';
      iframe.onload = onContentLoad;
      iframe.onerror = function () { showError(); };
      webview.innerHTML = '';
      webview.appendChild(iframe);
      return;
    }

    // ---- Plus 真机环境 ----
    var wv = plus.webview.create(MAIN_URL, 'main', {
      top: 0,
      bottom: 0,
      bounce: 'none',
      progress: { color: '#c9a44a', height: '2px' },
      useragent: { value: 'SDF1App/1.0', concat: true }
    });

    wv.addEventListener('loaded', onContentLoad);
    wv.addEventListener('loadError', function (e) {
      console.error('WebView load error:', e);
      showError();
    });

    webview.appendChild(wv);

    // 保持页面不被系统回收
    plus.globalEvent.addEventListener('pause', function () {});
  }

  /* -------------------------------------------
     3. 内容加载完成 → 隐藏闪屏
  ------------------------------------------- */
  function onContentLoad() {
    appReady = true;
    var elapsed = Date.now() - startTime;
    var remaining = Math.max(0, SPLASH_MIN_DURATION - elapsed);

    setTimeout(function () {
      splash.classList.add('fade-out');
      errorPage.classList.add('hidden');
      bottomBar.classList.remove('hidden');

      setTimeout(function () {
        splash.style.display = 'none';
      }, 600);
    }, remaining);
  }

  /* -------------------------------------------
     4. 错误处理
  ------------------------------------------- */
  function showError() {
    splash.classList.add('fade-out');
    setTimeout(function () {
      splash.style.display = 'none';
    }, 500);
    errorPage.classList.remove('hidden');
    bottomBar.classList.add('hidden');
  }

  function hideError() {
    errorPage.classList.add('hidden');
  }

  /* -------------------------------------------
     5. 底部导航事件
  ------------------------------------------- */
  function setupBottomBar() {
    var btns = bottomBar.querySelectorAll('.bar-btn');
    btns.forEach(function (btn) {
      btn.addEventListener('click', function () {
        var action = btn.getAttribute('data-action');

        // 切换 active 状态
        btns.forEach(function (b) { b.classList.remove('active'); });
        btn.classList.add('active');

        if (action === 'refresh') {
          reloadWebView();
        } else if (action === 'back') {
          goBack();
        } else if (action === 'home') {
          goHome();
        }
      });
    });
  }

  function reloadWebView() {
    if (typeof plus !== 'undefined') {
      var wv = webview.children[0];
      if (wv && wv.reload) {
        wv.reload();
      }
    } else {
      var iframe = webview.querySelector('iframe');
      if (iframe) iframe.src = MAIN_URL;
    }
  }

  function goBack() {
    if (typeof plus !== 'undefined') {
      var wv = webview.children[0];
      if (wv && wv.canBack) {
        wv.canBack(function (e) {
          if (e.canBack) {
            wv.back();
          }
        });
      }
    }
  }

  function goHome() {
    if (typeof plus !== 'undefined') {
      var wv = webview.children[0];
      if (wv) {
        wv.loadURL(MAIN_URL);
      }
    } else {
      var iframe = webview.querySelector('iframe');
      if (iframe) iframe.src = MAIN_URL;
    }
  }

  /* -------------------------------------------
     6. 物理返回键拦截（Android）
  ------------------------------------------- */
  function setupBackButton() {
    if (typeof plus === 'undefined') return;

    plus.key.addEventListener('backbutton', function () {
      var wv = webview.children[0];
      if (wv && wv.canBack) {
        wv.canBack(function (e) {
          if (e.canBack) {
            wv.back();
          } else {
            // 已在首页，按两次退出
            confirmExit();
          }
        });
      } else {
        confirmExit();
      }
    });
  }

  function confirmExit() {
    if (typeof plus === 'undefined') return;
    plus.nativeUI.confirm(
      '确定要退出应用吗？',
      function (e) {
        if (e.index === 0) {
          plus.runtime.quit();
        }
      },
      '退出提示',
      ['确定', '取消']
    );
  }

  /* -------------------------------------------
     7. 启动流程
  ------------------------------------------- */
  function boot() {
    checkNetwork(function (online) {
      if (!online) {
        showError();
        return;
      }
      initPlusWebView();
    });

    setupBottomBar();
    setupBackButton();

    retryBtn.addEventListener('click', function () {
      hideError();
      splash.style.display = '';
      splash.classList.remove('fade-out');
      startTime = Date.now();
      boot();
    });
  }

  // ---- 入口 ----
  if (typeof plus !== 'undefined') {
    // HTML5+ ready
    plus.ready(function () { boot(); });
  } else if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', boot);
  } else {
    boot();
  }
})();