'use strict';

const generateId = require('../../utils/generateId.util');
const { domain, name: domainName } = require('../../config').server;
const whatsappEvents = require('../emitter');
const createAsyncQueueProcessor = require('../emitter/queueProcessor');
const { callWebhook } = require('../webhook');
const { sessionStore } = require('..');
const { createWhatsApp } = require('../../core/baileys');
const { updateConnection, addCurrentConnection, resetConnection, getConnection } = require('../../services/connections.service');
const { getOutboundMessage, upsertOutboundMessage, createOutboundMessage } = require('../../services/outbound_messages.service');
const { objectMapper, pick, isEmpty, omitEmpty } = require('../../utils/commons.util');
const { logger, getUserLogger } = require('../../utils/logger.util');
const { DbData, waiContentToDB, uploadMediaFile, ctxToSendBuilder, ctxToDB  } = require('../../helper/wai.msg.helper');

const connectionEventNames = ['connection:connect', 'connection:open', 'connection:close'];
const messageEventNames = ['message:received', 'message:updated'];

const eventTypeMapped = {
  'message:received': 'wai.message.received',
  'message:updated': 'wai.message.updated',
  'creds:update': 'wai.creds.update',
};
const timeField = { saved: 'createTime', pending: 'createTime', sent: 'sendTime', delivered: 'deliverTime', read: 'readTime', failed: 'updateTime', error: 'updateTime' };
const statusMapped = { saved: 'accepted', pending: 'accepted', sent: 'sent', delivered: 'delivered', read: 'read', failed: 'failed', error: 'failed' };
function getCorrectOrderStatus(currentStatus, newStatus) {
  const statusOrder = ['accepted', 'failed', 'sent', 'delivered', 'read'];
  if (!currentStatus || typeof currentStatus !== 'string') {
    currentStatus = null; // default 'pending'
  }
  if (!newStatus || typeof newStatus !== 'string') {
    return currentStatus;
  }
  if (!statusOrder.includes(newStatus)) {
    // console.warn(`Unknown status: ${newStatus}`);
    return currentStatus;
  }
  if (!currentStatus) {
    return newStatus;
  }
  if (!statusOrder.includes(currentStatus)) {
    // console.warn(`Unknown status: ${currentStatus}`);
    return newStatus;
  }
  const currentIndex = statusOrder.indexOf(currentStatus);
  const newIndex = statusOrder.indexOf(newStatus);
  if (newIndex > currentIndex) {
    return newStatus;
  } else if (newIndex === currentIndex) {
    return currentStatus;
  } else {
    // Optionally handle cases where the new status is "behind" the current one
    // Options:
    // 1. Ignore the new status (most common):
    return currentStatus;
    // 2. Allow "downgrades" (use with caution, may indicate errors):
    // return newStatus;
    // 3. Throw an error or log a warning:
    // console.error(`Invalid status transition: ${currentStatus} -> ${newStatus}`);
    // return currentStatus; // Or throw an error
  }
}
const directionField = { 'message:received': 'inbound', 'message:updated': 'outbound' };
const directionPrefix = { inbound: 'in_', outbound: 'out_' };
const directionIdUserPrefix = { inbound: 'to', outbound: 'from' };

const uniqueMsgId = msg => (msg.id && msg.direction ? `${directionPrefix[msg.direction]}${msg[directionIdUserPrefix[msg.direction]].replace('+', '')}_${msg.id}` : undefined);

/**
 * @returns {Object} webhookBody
 */
const webhookBodyBuilder = (messageData, messageType) => {
  const defaultContent = { id: '', from: '', to: '', externalId: '', type: '', direction: '', status: '' };
  const outboundStatus = statusMapped?.[messageData.status] || messageData.status || '';
  const status = messageData.direction === 'inbound' ? '' : outboundStatus;
  const errors = messageData.status === 'error' ? { errorMessage: '未知错误', errorCode: '' } : {};
  const message = {
    id: `evt_${generateId().replace(/-/g, '')}`,
    type: eventTypeMapped[messageType],
    apiVersion: 'v2',
    webhooksource: 'wai',
    createTime: new Date(new Date().getTime() + 8 * 60 * 60 * 1000).toISOString(), // GMT +8
    domainName,
    conversationid: messageData?.externalId || '',
    whatsAppNo: messageData?.whatsAppNo || messageData.from || messageData.to || '',
    waiMessage: {
      ...defaultContent,
      ...messageData,
      ...(messageData.updateTime && !isEmpty(status) ? { [timeField[messageData.status]]: messageData.updateTime } : {}),
      type: messageData.type || messageData.msgtype || '',
      id: uniqueMsgId(messageData) || messageData.id || generateId(),
      wamid: messageData.id || '',
      // direction: directionField[messageType],
      status,
      ...errors,
      externalId: messageData?.externalId || '',
    },
  };
  return message;
};

const webhookBodyFill = (webhookBody, savedData) => {
  const DBDataObj = DbData(savedData);
  Object.assign(webhookBody.waiMessage, DBDataObj, pick(savedData, ['status']));
  return webhookBody;
};

/**
 * WhatsApp 连接事件
 * * connection:connect
 * * connection:open
 * * connection:close
 */
const setupConnectionHandler = () => {
  whatsappEvents.on('connection:connect', async connectionData => {
    try {
      getUserLogger(connectionData.phone).info({ msg: `连接https://web.whatsapp.com/`, connectionData });
      // find Or create
      await addCurrentConnection({
        ...objectMapper(connectionData, { phone: [{ key: 'wa_id' }], channelId: 'channel_id', createTimestamp: 'createtime', version: 'version' }, false),
        service_type: 'baileys',
        status: 'connecting',
      });
    } catch (error) {
      logger.error({ connectionData, error }, 'error add connection');
    }
  });
  whatsappEvents.on('connection:open', async connectionData => {
    // todo: 更新实例
    try {
      getUserLogger(connectionData.whatsAppNo).info({ msg: `已登录`, connectionData });
      await updateConnection(
        {
          ...objectMapper(connectionData, { whatsAppNo: [{ key: 'wa_id' }], channelId: 'channel_id' }),
          service_type: 'baileys',
          closetime: null,
        },
        { connect_domain: domain, connect_name: domainName },
      );
      const webhookBody = webhookBodyBuilder({ ...connectionData, to: connectionData.whatsAppNo, connection: 'open' }, 'creds:update');
      await callWebhook(webhookBody);
    } catch (error) {
      logger.error({ connectionData, error }, 'error add connection');
    }
  });
  whatsappEvents.on('connection:close', async connectionData => {
    try {
      getUserLogger(connectionData.whatsAppNo).warn({ msg: `断开连接`, connectionData });
      sessionStore.removeSession(connectionData.channelId);
      await updateConnection(
        {
          ...objectMapper(connectionData, { whatsAppNo: [{ key: 'wa_id' }], channelId: 'channel_id' }),
          service_type: 'baileys',
        },
        { connect_domain: domain, connect_name: domainName },
      );
      const webhookBody = webhookBodyBuilder({ ...connectionData, to: connectionData.whatsAppNo, connection: 'offline' }, 'creds:update');
      await callWebhook(webhookBody);
    } catch (error) {
      logger.error({ connectionData, error }, 'error close connection');
    }
  });
  whatsappEvents.on('connection:update', async connectionData => {
    try {
      getUserLogger(connectionData.whatsAppNo).warn({ msg: 'connection:update', connectionData });
      await updateConnection(
        {
          ...objectMapper(connectionData, { whatsAppNo: [{ key: 'wa_id' }], channelId: 'channel_id' }),
          service_type: 'baileys',
        },
        { connect_domain: domain, connect_name: domainName },
      );
      const webhookBody = webhookBodyBuilder({ ...connectionData, to: connectionData.whatsAppNo, connection: connectionData.status }, 'creds:update');
      await callWebhook(webhookBody);
    } catch (error) {
      logger.error({ connectionData, error }, 'error close connection');
    }
  });
};

/**
 * 监听 Creds 更新事件
 * * creds:update
 */
const setupCredsHandler = () => {
  whatsappEvents.on('creds:update', async creds => {
    try {
      getUserLogger(creds.whatsAppNo).info({ msg: `二维码`, creds });
      const webhookBody = webhookBodyBuilder({ ...creds, to: creds.whatsAppNo, connection: '' }, 'creds:update');
      await callWebhook(webhookBody);
    } catch (error) {
      logger.error({ creds, error }, 'error update creds');
    }
  });
};

/**
 * WhatsApp 消息事件
 * * pending ⏰ -> saved ⏰ -> sent(*) ✔ -> delivered ✔✔ -> read ✅
 * * saved -> pending -> sent(*) -> delivered -> read
 */
const setupMessageHandler = async () => {
  const messageListner = async ({ eventName, messageData }) => {
    // if (messageData.status === 'pending') {
    //   logger.info('message pending', messageData);
    //   return false;
    // }
    const { from, to, whatsAppNo } = messageData;
    const _whatsAppNo = whatsAppNo || from || to;
    getUserLogger(_whatsAppNo).info({ eventName, messageData });
    try {
      const now = new Date(new Date().getTime() + 60 * 60 * 1000).toISOString();

      const savedId = uniqueMsgId(messageData);
      const targetUpsert = messageData.externalId ? { actionId: messageData.externalId } : { id: savedId };
      const savedMsg = await getOutboundMessage(targetUpsert);
      const bixFields = pick(savedMsg, ['actionId', 'externalId']);
      const savedTimeFields = pick(savedMsg, Object.values(timeField));
      logger.info('message evt\n', eventName, messageData, savedMsg);
      const _type = messageData?.type || savedMsg?.msgtype || 'unresolvable';
      const typeField = { msgtype: _type }; // fix: type 空

      const webhookBody = webhookBodyBuilder({ ...savedTimeFields, ...messageData, ...bixFields, ...typeField }, eventName);
      const { waiMessage } = webhookBody;

      const timeFields = pick(waiMessage, Object.values(timeField));
      const upsertFields = pick(waiMessage, ['direction', 'wamid', 'id', 'status']);
      upsertFields.evt_id = webhookBody.id;
      const pusher = { customerProfile_id: waiMessage.customerProfile?.id || '', customerProfile_name: waiMessage.customerProfile?.name || '' };
      const record = objectMapper(waiMessage, { from: 'from', to: 'to', status: 'msg_status', type: 'msgtype' }, false);
      const waiContentFieldsToDB = messageData.type ? waiContentToDB(messageData) : {};
      // 是否空数据. 存储有数据的事件原文
      const upsertMsgOrigin = !isEmpty(omitEmpty(waiContentFieldsToDB)) || isEmpty(savedMsg);
      const msgOrigin = upsertMsgOrigin ? { message_origin: JSON.stringify(messageData) } : {};
      if (isEmpty(savedMsg.IVADS_link) && ['image', 'sticker', 'audio', 'video', 'document'].includes(messageData.type)) {
        // 存储文件
        const filePath = messageData[messageData.type].filePath;
        const webLink = await uploadMediaFile(filePath);
        waiContentFieldsToDB.IVADS_link = webLink;
      }
      const currenctStatus = getCorrectOrderStatus(savedMsg.msg_status, waiMessage.status);
      record.msg_status = currenctStatus;
      delete upsertFields.status;

      const readyUpsert = omitEmpty({ ...timeFields, ...pusher, ...waiContentFieldsToDB, ...record });
      const msgRow = await upsertOutboundMessage({ ...upsertFields, ...readyUpsert, ...typeField, ...msgOrigin }, targetUpsert);

      if (_type !== 'unresolvable') {
        // 把内容加上, 否则前端没显示
        await callWebhook(webhookBodyFill(webhookBody, { ...msgRow, status: msgRow.msg_status || '' }));
      }

      // 只对新消息, 同步的历史消息不再处理
      if (messageData.eventSource.includes('notify')) {
        whatsappEvents.emit(`user:${eventName}`, msgRow);
      }
    } catch (error) {
      logger.error({ messageData, error }, 'error call webhook');
    }
  };
  const queueProcessor = await createAsyncQueueProcessor(messageListner, {
    retryOptions: { retries: 1, minTimeout: 1000 },
  });

  messageEventNames.forEach(eventName => {
    // whatsappEvents.on(eventName, async messageData => await messageListner(messageData, eventName));
    whatsappEvents.on(eventName, messageData => {
      const savedId = uniqueMsgId(messageData);
      queueProcessor.enqueue(savedId, { eventName, messageData });
    });
  });
};

function setupWhatsappHandler() {
  setupConnectionHandler();
  setupCredsHandler();
  setupMessageHandler();
}

/**
 * 发送消息
 * @param {*} _data { from, to, msgtype, msgcontent: { body, image, }, actionId }
 */
async function sendMessage(_data) {
  const { from } = _data;
  const toUpsert = ctxToDB(_data);
  await createOutboundMessage({ ...toUpsert });
  const messagePayload = ctxToSendBuilder(_data);
  whatsappEvents.emit('request.' + from + '.send.message', messagePayload);
}

/**
 * 登出: 当前服务的所有连接
 */
async function resetCurrentConnections() {
  await resetConnection();
}

/**
 * 登录: 当前服务的所有连接
 */
async function loginCurrentConnections() {
  const currents = await getConnection({ connect_domain: domain, connect_name: domainName, status: ['open', 'hosted'] });
  for (const user of currents) {
    const { wa_id: waId } = user;
    const phone = waId.replace('+', '');
    const whatsApp1 = await createWhatsApp(phone);
    whatsApp1.start();
    sessionStore.createSession(phone, whatsApp1);
  }
}

module.exports = { setupWhatsappHandler, resetCurrentConnections, loginCurrentConnections, sendMessage };