console.log("background");

var task_manager = {
}

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  sendResponse({});
  switch (request.type) {
    case BackgroundMsgType.CONTENT:
      FinishTask(sender, request.content);
      break;
    case BackgroundMsgType.ERROR:
      ErrorTask(sender, request.error)
      break;
    case BackgroundMsgType.GETTASK:
      GetTask(sender);
      break;
    case BackgroundMsgType.NOTWANT:
      task = task_manager[sender.tab.id];
      
      if(task.data.waitcapture != undefined) {
        setTimeout(function(){
          CaptureContentCurrentPage(sender.tab.id);
        }, task.data.waitcapture);
      } else {

        task.data.retry --;
        if(task.data.retry >= 0) {
          setTimeout(function(){
            CaptureContent(task);
          }, 6000)
        } else {
          ErrorTask(sender, request.content);
        }
      }

 
      break;
    case BackgroundMsgType.CLOSETAB:
      delete task_manager[sender.tab.id] 
      chrome.tabs.remove(sender.tab.id);
    default:
      break;
  }
});

function GetTask(sender) {
  fetch(GetTaskUrl).then(function (response) {
    if (response.ok) {
      response.json().then(function (task) {
        CaptureContent(task);
      })
    } else {
      console.log("error response:", response.text())
      ErrorTask(sender, response.text());
    }
  }).catch(function (reason) {
    console.log(reason);
    ErrorTask(sender, reason);
  })
}

function CaptureContentCurrentPage(tabid) {
  chrome.tabs.executeScript(tabid, { runAt: "document_end", file: "background/capture.js" });
}

function CaptureContent(task) {
  if (task.code == 200) {

    if(task.data.retry == undefined) {
      task.data.retry = 1;
    }

    chrome.tabs.create({ url: task.data.url }, function (tab) {
      task_manager[tab.id] = task;
      if (task.data.content_condition) {
        condition = `${task.data.content_condition}`;
      } else {
        condition = undefined;
      }

      if (condition != undefined) {
        chrome.tabs.executeScript(tab.id, { runAt: "document_start", code: condition }, function () {
          CaptureContentCurrentPage(tab.id)
        });
      } else {
        CaptureContentCurrentPage(tab.id)
      }
    });
  }
}

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);
  
  delete task_manager[sender.tab.id];
  chrome.tabs.remove(sender.tab.id);
  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) {
    ErrorTask(sender, error);
    console.log(error)
    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 }, function (response) {
    if (response.ok) {
      response.json().then(function (value) {
        if (value.code == 200) {
          GetTask(sender);
          return
        }
      });
    }
  }).then().catch(function (error) {
    console.log(error)
    return;
  });
}