var task_manager = {
}

function GetTask(sender) {
  fetch(GetTaskUrl).then(function (response) {
    if (response.ok) {
      response.json().then(function (task) {
        if(task.code == 200) {
          task_manager[sender.tab.id] = task;
          var execCode = `window.location.href = "${task.data.url}";`
          if(task.data.content_condition) {
            execCode += `PassContentCondition = ${task.data.content_condition};`
          }
          chrome.tabs.executeScript(sender.tab.id, {runAt: "document_end", code:  execCode})
          Tell(sender, InjectMsgType.FETCH);
        } else {
          Tell(sender, InjectMsgType.NOTASK);
        }
      })
    } else {
      // ErrorTask(sender, "error response:" + response.text())
      console.log("error response:",response.text())
    }
  }).catch(function (reason) {
    console.log(reason);
    // GetTask();
  })
}

function FinishTask(sender, content) {
  var task = task_manager[sender.tab.id];
 
  var formdata = new FormData();
  formdata.append("taskid", task.data.taskid);
  formdata.append("content", content);
  // console.log(task.data.taskid);
  fetch(FinishTaskUrl, {method: "POST", body: formdata }).then(function (response) { 
    if (response.ok) { 
      response.json().then(function (value) { 
        if (value.code == 200) {
          GetTask(sender);
          return
        }
      });
    }
  }).catch(function(error){
    // TODO: 汇报错误
    // ErrorTask(sender, error);
    console.log(error)
    // GetTask(sender);
    return;
  });
}

function ErrorTask(sender, error) {
  var task = task_manager[sender.tab.id];
  var formdata = new FormData();
  formdata.append("taskid", task.data.taskid);
  formdata.append("error", error);
  fetch(ErrorTaskUrl, {method: "POST", body:  formdata});
}

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  sendResponse({});
  switch (request.type) {
    case BackgroundMsgType.CONTENT:
      // 重新获取任务
      FinishTask(sender, request.content);
      break;
    case BackgroundMsgType.ERROR:
      // 重新获取任务
      ErrorTask(sender, request.error)
      GetTask(sender);
      break;
    case BackgroundMsgType.GETTASK:
      GetTask(sender);
      break;
    case BackgroundMsgType.NOTWANT:
      Tell(sender,InjectMsgType.WAIT);
      break;
    default:
      break;
  }
});

function Tell(sender, jnjectType) {
  try {
    chrome.tabs.sendMessage(sender.tab.id , {type: jnjectType})
  } catch (error) {
    console.log(error);
  }
}

// 配置使用的监听
chrome.webRequest.onBeforeRequest.addListener(function (details) {
  if (details.url.startsWith("http://eson.config")) {
    var params =  new URL(details.url).searchParams;
    UpdateHost(params.get("taskurl"))
    chrome.tabs.remove(details.tabId);
    chrome.tabs.query({currentWindow: true}, function(tabs) {
      var count =  0
      for(var tab of tabs) {
        if(!tab.url.startsWith("chrome://") ) {
          count++;
          chrome.tabs.executeScript(tab.id, {runAt: "document_end", code: `window.location.href = "${Host}"` })
        } else {
          chrome.tabs.remove(tab.id);
        }
      }
      for(var i = count; i < WorkerNumber;i++) {
        chrome.tabs.create({url: `${Host}`});
      }
    })
    return { cancel: true };
  }
}, { 'urls': ["<all_urls>"] }, ['blocking']);