import { computed, ref } from "vue";
import { sendHardwareBoxUpdateAPI } from "@/apis";
import useStore from "@/store";
import { storeToRefs } from "pinia";

const OTA_PROGRESS_EVENT = "/addons/shoot/otaProgress";
const OTA_RESULT_EVENT = "/addons/shoot/otaResult";
const UPDATE_TIMEOUT = 10 * 60 * 1000;

const phaseTextMap = {
  started: "正在准备固件更新",
  downloading: "正在下载固件",
  installing: "正在安装固件",
};

// 设备详情中的 latestVersion 是升级目标，version 是当前固件版本。
export const getOtaInfoFromDetail = (detail) => ({
  versionNumber: String(detail?.latestVersion ?? "").trim(),
  currentVersion: String(detail?.version ?? "").trim(),
  versionInfo: String(detail?.versionInfo ?? "").trim(),
  needUpdate: detail?.needUpdate === true || Number(detail?.needUpdate) === 1,
  forceUpdate: detail?.forceUpdate === true || Number(detail?.forceUpdate) === 1,
});

// OTA 状态由首页、WiFi 设置页和我的设备页共享，页面切换后仍可继续接收进度。
const updating = ref(false);
const progress = ref(0);
const phase = ref("started");
const resultVisible = ref(false);
const resultStatus = ref("");
const resultReason = ref("");

let deviceRef = null;
let updateRunId = 0;
let targetVersion = "";
let lastFinishedVersion = "";
let timeoutTimer = null;
let successCallback = null;
let socketListening = false;

const phaseText = computed(
  () => phaseTextMap[phase.value] || "正在进行固件更新"
);
const resultTitle = computed(() =>
  resultStatus.value === "success" ? "固件更新完成" : "固件更新失败"
);
const resultContent = computed(() => {
  if (resultStatus.value === "success") return "固件更新已完成";
  return resultReason.value || "更新失败，请检查设备及网络后重试";
});

const clearTimers = () => {
  clearTimeout(timeoutTimer);
  timeoutTimer = null;
};

const resetActiveUpdate = () => {
  clearTimers();
  successCallback = null;
};

const finishUpdate = (status, reason = "", runId = updateRunId) => {
  if (runId !== updateRunId || !updating.value) return;
  const onSuccess = successCallback;
  resetActiveUpdate();
  updating.value = false;
  resultStatus.value = status;
  resultReason.value = reason;
  lastFinishedVersion = targetVersion;
  if (status === "success") {
    progress.value = 100;
    phase.value = "installing";
    onSuccess?.();
  }
  resultVisible.value = true;
};

const isCurrentDeviceMessage = (data) => {
  const messageDeviceId = String(data?.deviceId || "");
  const currentDeviceId = String(deviceRef?.value?.deviceId || "");
  return !messageDeviceId || !currentDeviceId || messageDeviceId === currentDeviceId;
};

const isCurrentVersionMessage = (data) => {
  const messageVersion = String(data?.versionNumber || "");
  return !messageVersion || !targetVersion || messageVersion === targetVersion;
};

// 页面切换导致弹窗关闭后，使用下一条进度消息恢复当前 OTA 会话。
const recoverUpdateFromMessage = (data) => {
  updateRunId += 1;
  const runId = updateRunId;
  targetVersion = String(data?.versionNumber || "");
  lastFinishedVersion = "";
  successCallback = null;
  resultVisible.value = false;
  resultStatus.value = "";
  resultReason.value = "";
  progress.value = 0;
  phase.value = "started";
  updating.value = true;
  clearTimers();
  timeoutTimer = setTimeout(() => {
    finishUpdate("failed", "固件更新超时，请稍后重试", runId);
  }, UPDATE_TIMEOUT);
};

function handleSocketMessage(message) {
  if (Number(message?.code ?? 0) !== 0) return;
  if (![OTA_PROGRESS_EVENT, OTA_RESULT_EVENT].includes(message?.event)) return;
  if (!isCurrentDeviceMessage(message.data)) return;

  const messageVersion = String(message.data?.versionNumber || "");

  if (message.event === OTA_PROGRESS_EVENT) {
    if (!updating.value) {
      if (
        lastFinishedVersion &&
        (!messageVersion || messageVersion === lastFinishedVersion)
      ) {
        return;
      }
      recoverUpdateFromMessage(message.data);
    } else if (!isCurrentVersionMessage(message.data)) {
      return;
    }
    if (!targetVersion && messageVersion) targetVersion = messageVersion;

    const nextProgress = Math.min(
      100,
      Math.max(0, Number(message.data?.progress) || 0)
    );
    progress.value = Math.max(progress.value, nextProgress);
    if (phaseTextMap[message.data?.phase]) {
      phase.value = message.data.phase;
    }
    return;
  }

  if (!updating.value) {
    if (
      lastFinishedVersion &&
      (!messageVersion || messageVersion === lastFinishedVersion)
    ) {
      return;
    }
    recoverUpdateFromMessage(message.data);
  } else if (!isCurrentVersionMessage(message.data)) {
    return;
  }
  if (!targetVersion && messageVersion) targetVersion = messageVersion;

  if (message.data?.status === "success") {
    finishUpdate("success");
  } else if (message.data?.status === "failed") {
    finishUpdate("failed", message.data?.reason || "");
  }
}

const startSocketListening = () => {
  if (socketListening) return;
  uni.$on("socket-inbox", handleSocketMessage);
  socketListening = true;
};

export const useOtaUpdate = () => {
  const store = useStore();
  const { device } = storeToRefs(store);
  deviceRef = device;
  startSocketListening();

  const startUpdate = async ({
    versionNumber,
    wifiSsid = "",
    wifiPassword = "",
    onSuccess,
  }) => {
    if (updating.value) return false;
    const nextVersion = String(versionNumber || "").trim();
    if (!nextVersion) {
      uni.showToast({ title: "缺少固件目标版本", icon: "none" });
      return false;
    }

    updateRunId += 1;
    const runId = updateRunId;
    targetVersion = nextVersion;
    lastFinishedVersion = "";
    successCallback = onSuccess || null;
    resultVisible.value = false;
    resultStatus.value = "";
    resultReason.value = "";
    progress.value = 0;
    phase.value = "started";
    updating.value = true;
    clearTimers();
    timeoutTimer = setTimeout(() => {
      finishUpdate("failed", "固件更新超时，请稍后重试", runId);
    }, UPDATE_TIMEOUT);

    try {
      const updateResult = await sendHardwareBoxUpdateAPI({
        versionNumber: targetVersion,
        wifiSsid,
        wifiPassword,
      });
      if (runId !== updateRunId || !updating.value) return false;
      if (!updateResult?.taskId) {
        finishUpdate("failed", "固件更新任务创建失败，请稍后重试", runId);
        return false;
      }
      return true;
    } catch (error) {
      if (runId === updateRunId) {
        finishUpdate(
          "failed",
          error?.message || "固件更新请求失败，请稍后重试",
          runId
        );
      }
      return false;
    }
  };

  const closeResult = () => {
    resultVisible.value = false;
  };

  return {
    updating,
    progress,
    phase,
    phaseText,
    resultVisible,
    resultStatus,
    resultTitle,
    resultContent,
    startUpdate,
    closeResult,
  };
};