let appInsLogLevel = "";
function setAppInstallLogLevel() {
  const level = logLevel.value;

  fetch("/api/app-install/loglevel", {
    method: "POST",
    headers: {"Content-Type": "application/json"},
    body: JSON.stringify({level})
  })
  .then(async r => {
    if (!r.ok) throw new Error(await r.text());
    appInsLogLevel = level;
  })
  .catch(e => {
    logLevel.value = appInsLogLevel;
  });
}

function getAppInstallLevel() {
  fetch("/api/app-install/loglevel")
  .then(async r => {
    if (!r.ok) throw new Error(await r.text());
    return r.json();
  })
  .then(d => {
    appInsLogLevel = d.log_level;
    logLevel.value = d.log_level;
  })
  .catch(e => {
    appInsLogLevel = "";
    logLevel.value = "";
  });
}

function downloadAppInstallLogFile(event) {
  const btn = event.currentTarget;
  btn.disabled = true;

  fetch("/api/app-install/logfile")
  .then(async r => {
    if (!r.ok) {
      throw new Error("HTTP " + r.status);
    }

    const disposition = r.headers.get("Content-Disposition");
    let filename = "app-install.log.tar.gz";
    if (disposition) {
      const match = disposition.match(/filename="?([^";]+)"?/);
      if (match) {
        filename = match[1];
      }
    }

    return {
      blob: await r.blob(),
      filename
    };
  })
  .then(({ blob, filename }) => {
    const url = URL.createObjectURL(blob);

    const a = document.createElement("a");
    a.href = url;
    a.download = filename;

    document.body.appendChild(a);
    a.click();
    a.remove();

    setTimeout(() => {
      URL.revokeObjectURL(url);
    }, 1000);

    alert("下载成功");
  })
  .catch(e => {
    console.error("download failed:", e);
    alert("下载失败: " + e.message);
  })
  .finally(() => {
    btn.disabled = false;
    btn.textContent = "下载";
  });
}

function restartAppInstallService(event) {
  if (!confirm("确定重启应该管理服务吗？")) {
    return;
  }

  const btn = event.currentTarget;
  btn.disabled = true;

  fetch("/api/app-install/restart", {
    method: "POST"
  })
  .then(async r => {
    if (!r.ok) {
      throw new Error(await r.text());
    }
    logLevel.value = "info";
    appInsLogLevel = logLevel.value;
    disconnectLog();
    connectLog("yfkj-app-install.service", "text1");
    alert("重启成功");
  })
  .catch(e => {
    console.error("restart failed:", e);
    alert("重启失败: " + e.message);
  })
  .finally(() => {
    btn.disabled = false;
  });
}

let appInsStatusTimer = null;
function getAppInstallStatus() {
  fetch("/api/app-install/status")
    .then(async r => {
      if (!r.ok) {
        throw new Error("HTTP " + r.status);
      }

      return r.json();
    })
    .then(data => {
      [
        "avar1", "avar2", "avar3", "avar4",
        "bvar1", "bvar2", "bvar3", "bvar4", "bvar5",
        "cvar1", "cvar2", "cvar3", "cvar4", "cvar5"
      ].forEach(id => {
        setText(id, data[id], "page6");
      });

      updateAppInstallButtons(Number(data.state));
    })
    .catch(e => {
      console.error("getAppInstallStatus() failed:", e);

      [
        "avar1", "avar2", "avar3", "avar4",
        "bvar1", "bvar2", "bvar3", "bvar4", "bvar5",
        "cvar1", "cvar2", "cvar3", "cvar4", "cvar5"
      ].forEach(id => {
        setText(id, null, "page6");
      });

      updateAppInstallButtons(-1);
    });

  getAppInstallLevel();
}

function startAppInstallStatusRefresh() {
  if (appInsStatusTimer) {
    return;
  }

  getAppInstallStatus();

  appInsStatusTimer = setInterval(() => {
    getAppInstallStatus();
  }, 5000);
}

function stopAppInstallStatusRefresh() {
  if (appInsStatusTimer) {
    clearInterval(appInsStatusTimer);
    appInsStatusTimer = null;
  }
}

function updateAppInstallButtons(state) {
  switch (state) {
   case 0: // 无安装包, 等待上传
    setBtnStatus("btn1", true,  "page6")
    setBtnStatus("btn2", false, "page6")
    setBtnStatus("btn3", false, "page6")
    setBtnStatus("btn4", false, "page6")
    break;
   case 1: // 有安装包, 未安装时
    setBtnStatus("btn1", false, "page6")
    setBtnStatus("btn2", true,  "page6")
    setBtnStatus("btn3", true,  "page6")
    setBtnStatus("btn4", false, "page6")
    break;
   case 2: // 有安装包, 已安装时
    setBtnStatus("btn1", false, "page6")
    setBtnStatus("btn2", false, "page6")
    setBtnStatus("btn3", false, "page6")
    setBtnStatus("btn4", true,  "page6")
    break;
   default:
    setBtnStatus("btn1", true,  "page6")
    setBtnStatus("btn2", true,  "page6")
    setBtnStatus("btn3", true,  "page6")
    setBtnStatus("btn4", true,  "page6")
    break;
  }
}

let userAppUploading = false;

function onBtn1Click() {
  if (userAppUploading) {
    return;
  }
  document.getElementById("userAppFile").click();
}

function uploadUserAppFile(input) {
  let file = input.files[0];

  if (!file) {
    return;
  }

  if (!file.name.toLowerCase().endsWith(".tar.gz")) {
    alert("只允许上传 tar.gz 类型的文件");
    input.value = "";
    return;
  }

  userAppUploading = true;

  let formData = new FormData();
  formData.append("file", file);

  let xhr = new XMLHttpRequest();
  xhr.open("POST", "/api/app-install/uploadUserAPP", true);
  xhr.timeout = 600000; // 10分钟

  xhr.upload.onprogress = function(e) {
    if (!e.lengthComputable) {
      return;
    }

    let percent = Math.floor(e.loaded * 100 / e.total);
    setText("bvar5", "正在上传 " + file.name + " (" + percent + "%)", "page6");
  };

  xhr.onload = function() {
    userAppUploading = false;
    input.value = "";

    if (xhr.status !== 200) {
      setText("bvar5", "上传失败: " + xhr.responseText, "page6");
      return;
    }

    setText("bvar5", "上传完成，等待下一步处理", "page6");
  };

  xhr.onerror = function() {
    userAppUploading = false;
    input.value = "";

    setText("bvar5", "上传失败，请检查网络连接", "page6");
  };

  xhr.ontimeout = function() {
    userAppUploading = false;
    input.value = "";

    setText("bvar5", "上传超时，请稍后重新尝试", "page6");
  };

  xhr.send(formData);
}

function initPage6() {
  startAppInstallStatusRefresh()
  connectLog("yfkj-app-install.service", "text1");
}

function exitPage6() {
  stopAppInstallStatusRefresh()
  disconnectLog();
}