/**
 * 微信订阅消息授权工具
 * 负责在关键操作前请求用户授权订阅消息，实现提醒推送。
 */

// 微信公众平台配置的模板ID（与后端 .env 配置保持一致）
var TEMPLATE_IDS = {
  // 订单状态变更通知
  order_status_change: "TkCDtUd1d2MPzMMy_QwvaoHxvweBY-uA9p3jk3nsKi0",
  // 订单待审批通知
  order_approval_needed: "xNlOt-_6jMTh5VKf9F_pX4aMtwpjXZKUBBTp8QtzTag",
  // 物流任务分配通知
  task_assigned: "uzivHUxL1A3cBguMvC6HDO4aXqvmCV8X3o538SpDEX4",
  // 物流超时提醒
  logistics_timeout: "1NtPbIS_LtmsJhl4V4V3poWO_EZYYFNbKoLzO1TLTDc",
  // 欠款提醒
  arrears: "ulYRf4HgTXNWYSqT0KYVKJiHnG19_12tjcDXMYD2kHo",
  // 客户沉默提醒
  inactive_customer: "pWYFYbZNJvnOGD-4ycNf8zxmseIiuogFAXa9biVscBc",
};

var CONFIG_KEY_TO_TEMPLATE_TYPE = {
  wechat_template_order_status: "order_status_change",
  wechat_template_approval: "order_approval_needed",
  wechat_template_task_assigned: "task_assigned",
  wechat_template_logistics_timeout: "logistics_timeout",
  wechat_template_arrears: "arrears",
  wechat_template_inactive_customer: "inactive_customer",
};

/**
 * 设置模板ID（在 app.js 或配置文件中调用）
 * @param {Object} ids - 模板ID映射
 */
function setTemplateIds(ids) {
  Object.assign(TEMPLATE_IDS, ids);
}

function applyConfigItems(configItems) {
  var ids = {};
  (configItems || []).forEach(function (item) {
    var templateType = CONFIG_KEY_TO_TEMPLATE_TYPE[item.config_key];
    if (templateType && item.config_value) {
      ids[templateType] = item.config_value;
    }
  });
  setTemplateIds(ids);
}

/**
 * 请求订阅消息授权
 * @param {string[]} tmplIds - 模板ID数组
 * @returns {Promise<Object>} 授权结果
 */
function requestSubscribe(tmplIds) {
  // 过滤空的模板ID
  var validIds = tmplIds.filter(function (id) {
    return id && id.length > 0;
  });

  if (validIds.length === 0) {
    return Promise.resolve({});
  }

  return new Promise(function (resolve) {
    wx.requestSubscribeMessage({
      tmplIds: validIds,
      success: function (res) {
        console.log("[Subscribe] 授权结果:", res);
        resolve(res);
      },
      fail: function (err) {
        console.warn("[Subscribe] 授权失败:", err);
        resolve({});
      },
    });
  });
}

/**
 * 获取操作对应的模板ID列表
 * @param {string} action - 操作类型
 * @returns {string[]} 模板ID数组
 */
function getTemplateIdsForAction(action) {
  var mapping = {
    // 创建订单 -> 通知管理层审批
    create_order: ["order_approval_needed"],
    // 审批操作 -> 通知业务员
    approve: ["order_status_change"],
    // 接单 -> 订单状态变更通知
    accept_task: ["order_status_change"],
    // 揽货 -> 订单状态变更通知
    pickup_task: ["order_status_change"],
    // 送达 -> 订单状态变更通知
    deliver_task: ["order_status_change"],
    // 分配任务 -> 通知司机
    assign_task: ["task_assigned"],
    // 通用登录 -> 接收所有类型通知
    login: [
      "order_status_change",
      "order_approval_needed",
      "task_assigned",
      "logistics_timeout",
      "arrears",
    ],
  };

  return mapping[action] || [];
}

/**
 * 在关键操作前确保已授权订阅消息
 * @param {string} action - 操作类型
 * @returns {Promise<void>}
 */
async function ensureSubscribePermission(action) {
  var tmplIds = getTemplateIdsForAction(action);
  if (tmplIds.length === 0) {
    return;
  }

  try {
    // 检查订阅消息总开关
    var setting = await new Promise(function (resolve) {
      wx.getSetting({
        success: function (res) {
          resolve(res);
        },
        fail: function () {
          resolve({});
        },
      });
    });

    var subscriptionsSetting = setting.subscriptionsSetting || {};

    // 如果总开关已关闭，提示用户开启
    if (subscriptionsSetting.mainSwitch === false) {
      console.log("[Subscribe] 订阅消息总开关已关闭");
      return;
    }

    // 检查是否已有授权
    var itemSettings = subscriptionsSetting.itemSettings || {};
    var needRequest = tmplIds.some(function (id) {
      return !itemSettings[id] || itemSettings[id] === "reject";
    });

    if (needRequest) {
      await requestSubscribe(tmplIds);
    }
  } catch (e) {
    console.warn("[Subscribe] 检查授权状态失败:", e);
    // 降级：直接请求授权
    await requestSubscribe(tmplIds);
  }
}

module.exports = {
  setTemplateIds: setTemplateIds,
  applyConfigItems: applyConfigItems,
  requestSubscribe: requestSubscribe,
  getTemplateIdsForAction: getTemplateIdsForAction,
  ensureSubscribePermission: ensureSubscribePermission,
};