const PurchaseBatchModel = require('../models/purchaseBatchModel');
const PurchaseRequestModel = require('../models/purchaseRequestModel');
const { saveBase64Image } = require('../services/imageUploadService');
const logger = require('../utils/logger');
const notifyHelper = require('../../../shared/utils/notifyHelper');

const PurchaseBatchController = {
  getAll: async (req, res) => {
    try {
      const { status } = req.query;
      const rows = await PurchaseBatchModel.getAll({ status });
      res.json({ success: true, data: rows });
    } catch (err) {
      logger.error('PurchaseBatch getAll error:', err);
      res.status(500).json({ success: false, message: '서버 오류가 발생했습니다.' });
    }
  },

  getById: async (req, res) => {
    try {
      const batch = await PurchaseBatchModel.getById(req.params.id);
      if (!batch) return res.status(404).json({ success: false, message: '그룹을 찾을 수 없습니다.' });
      // 포함된 요청 목록도 함께 반환
      const requests = await PurchaseRequestModel.getAll({ batch_id: req.params.id });
      res.json({ success: true, data: { ...batch, requests } });
    } catch (err) {
      logger.error('PurchaseBatch getById error:', err);
      res.status(500).json({ success: false, message: '서버 오류가 발생했습니다.' });
    }
  },

  // 그룹 생성 + 요청 포함
  create: async (req, res) => {
    try {
      const { batch_name, category, vendor_id, notes, request_ids } = req.body;
      if (!request_ids || !request_ids.length) {
        return res.status(400).json({ success: false, message: '그룹에 포함할 신청 건을 선택해주세요.' });
      }

      const batchId = await PurchaseBatchModel.create({
        batchName: batch_name,
        category,
        vendorId: vendor_id,
        notes,
        createdBy: req.user.id
      });

      await PurchaseBatchModel.addRequests(batchId, request_ids);

      // 신청자들에게 알림
      const requesterIds = await PurchaseRequestModel.getRequesterIdsByBatch(batchId);
      if (requesterIds.length > 0) {
        notifyHelper.send({
          type: 'purchase',
          title: '구매 진행 안내',
          message: '신청하신 소모품 구매가 진행됩니다.',
          link_url: '/pages/purchase/request-mobile.html',
          target_user_ids: requesterIds,
          created_by: req.user.id
        }).catch(() => {});
      }

      const batch = await PurchaseBatchModel.getById(batchId);
      res.status(201).json({ success: true, data: batch, message: '그룹이 생성되었습니다.' });
    } catch (err) {
      logger.error('PurchaseBatch create error:', err);
      res.status(400).json({ success: false, message: err.message || '서버 오류가 발생했습니다.' });
    }
  },

  update: async (req, res) => {
    try {
      const { batch_name, category, vendor_id, notes, add_request_ids, remove_request_ids } = req.body;
      const batch = await PurchaseBatchModel.getById(req.params.id);
      if (!batch) return res.status(404).json({ success: false, message: '그룹을 찾을 수 없습니다.' });

      if (batch_name !== undefined || category !== undefined || vendor_id !== undefined || notes !== undefined) {
        await PurchaseBatchModel.update(req.params.id, {
          batchName: batch_name !== undefined ? batch_name : batch.batch_name,
          category: category !== undefined ? category : batch.category,
          vendorId: vendor_id !== undefined ? vendor_id : batch.vendor_id,
          notes: notes !== undefined ? notes : batch.notes
        });
      }

      if (add_request_ids && add_request_ids.length) {
        await PurchaseBatchModel.addRequests(req.params.id, add_request_ids);
      }
      if (remove_request_ids && remove_request_ids.length) {
        await PurchaseBatchModel.removeRequests(req.params.id, remove_request_ids);
      }

      const updated = await PurchaseBatchModel.getById(req.params.id);
      res.json({ success: true, data: updated, message: '그룹이 수정되었습니다.' });
    } catch (err) {
      logger.error('PurchaseBatch update error:', err);
      res.status(400).json({ success: false, message: err.message || '서버 오류가 발생했습니다.' });
    }
  },

  delete: async (req, res) => {
    try {
      const deleted = await PurchaseBatchModel.delete(req.params.id);
      if (!deleted) return res.status(400).json({ success: false, message: '대기 상태의 그룹만 삭제할 수 있습니다.' });
      res.json({ success: true, message: '그룹이 삭제되었습니다.' });
    } catch (err) {
      logger.error('PurchaseBatch delete error:', err);
      res.status(500).json({ success: false, message: '서버 오류가 발생했습니다.' });
    }
  },

  // 그룹 일괄 구매 처리
  purchase: async (req, res) => {
    try {
      const batch = await PurchaseBatchModel.getById(req.params.id);
      if (!batch) return res.status(404).json({ success: false, message: '그룹을 찾을 수 없습니다.' });
      if (batch.status !== 'pending') {
        return res.status(400).json({ success: false, message: '대기 상태의 그룹만 구매 처리할 수 있습니다.' });
      }

      // batch 내 모든 요청 purchased 전환
      await PurchaseRequestModel.markBatchPurchased(req.params.id);
      await PurchaseBatchModel.markPurchased(req.params.id, req.user.id);

      res.json({ success: true, message: '일괄 구매 처리가 완료되었습니다.' });
    } catch (err) {
      logger.error('PurchaseBatch purchase error:', err);
      res.status(500).json({ success: false, message: '서버 오류가 발생했습니다.' });
    }
  },

  // 그룹 일괄 입고 처리
  receive: async (req, res) => {
    try {
      const batch = await PurchaseBatchModel.getById(req.params.id);
      if (!batch) return res.status(404).json({ success: false, message: '그룹을 찾을 수 없습니다.' });
      if (batch.status !== 'purchased') {
        return res.status(400).json({ success: false, message: '구매완료 상태의 그룹만 입고 처리할 수 있습니다.' });
      }

      const { received_location, photo } = req.body;
      let receivedPhotoPath = null;
      if (photo) {
        receivedPhotoPath = await saveBase64Image(photo, 'received', 'purchase_received');
      }

      await PurchaseRequestModel.receiveBatch(req.params.id, {
        receivedPhotoPath,
        receivedLocation: received_location,
        receivedBy: req.user.id
      });
      await PurchaseBatchModel.markReceived(req.params.id, req.user.id);

      // 신청자들에게 입고 알림
      const requesterIds = await PurchaseRequestModel.getRequesterIdsByBatch(req.params.id);
      if (requesterIds.length > 0) {
        notifyHelper.send({
          type: 'purchase',
          title: '소모품 입고 완료',
          message: `소모품이 입고되었습니다.${received_location ? ' 보관위치: ' + received_location : ''}`,
          link_url: '/pages/purchase/request-mobile.html',
          target_user_ids: requesterIds,
          created_by: req.user.id
        }).catch(() => {});
      }

      res.json({ success: true, message: '일괄 입고 처리가 완료되었습니다.' });
    } catch (err) {
      logger.error('PurchaseBatch receive error:', err);
      res.status(500).json({ success: false, message: '서버 오류가 발생했습니다.' });
    }
  }
};

module.exports = PurchaseBatchController;