const { CattleBatch, IotCattle, Farm, CattleBatchAnimal, User } = require('../models');
const { Op } = require('sequelize');

/**
 * 批次设置控制器
 */
class CattleBatchController {
  /**
   * 获取批次列表
   */
  async getBatches(req, res) {
    try {
      const { page = 1, pageSize = 10, search, type, status } = req.query;
      const offset = (page - 1) * pageSize;

      console.log('🔍 [后端-批次设置] 搜索请求参数:', { page, pageSize, search, type, status });

      // 构建查询条件
      const where = {};
      if (search) {
        where[Op.or] = [
          { name: { [Op.like]: `%${search}%` } },
          { code: { [Op.like]: `%${search}%` } }
        ];
        console.log('🔍 [后端-批次设置] 搜索条件:', where[Op.or]);
      }
      if (type) {
        where.type = type;
      }
      if (status) {
        where.status = status;
      }

      const { count, rows } = await CattleBatch.findAndCountAll({
        where,
        include: [
          {
            model: Farm,
            as: 'farm',
            attributes: ['id', 'name']
          }
        ],
        limit: parseInt(pageSize),
        offset: offset,
        order: [['created_at', 'DESC']]
      });

      console.log('🔍 [后端-批次设置] 查询结果:', {
        总数: count,
        当前页数据量: rows.length,
        搜索关键词: search,
        查询条件: where
      });

      res.json({
        success: true,
        data: {
          list: rows,
          total: count,
          page: parseInt(page),
          pageSize: parseInt(pageSize)
        },
        message: '获取批次列表成功'
      });
    } catch (error) {
      console.error('获取批次列表失败:', error);
      res.status(500).json({
        success: false,
        message: '获取批次列表失败',
        error: error.message
      });
    }
  }

  /**
   * 获取批次详情
   */
  async getBatchById(req, res) {
    try {
      const { id } = req.params;

      const batch = await CattleBatch.findByPk(id, {
        include: [
          {
            model: Farm,
            as: 'farm',
            attributes: ['id', 'name']
          }
        ]
      });

      if (!batch) {
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      res.json({
        success: true,
        data: batch,
        message: '获取批次详情成功'
      });
    } catch (error) {
      console.error('获取批次详情失败:', error);
      res.status(500).json({
        success: false,
        message: '获取批次详情失败',
        error: error.message
      });
    }
  }

  /**
   * 创建批次
   */
  async createBatch(req, res) {
    try {
      console.log('🆕 [后端-批次设置] 开始创建操作');
      console.log('📋 [后端-批次设置] 请求数据:', req.body);

      const { 
        name, 
        code, 
        type, 
        startDate, 
        expectedEndDate, 
        actualEndDate, 
        targetCount, 
        currentCount, 
        manager, 
        status, 
        remark, 
        farmId 
      } = req.body;

      // 验证必填字段
      if (!name || !code || !type || !startDate || !targetCount || !manager) {
        console.log('❌ [后端-批次设置] 必填字段验证失败:', {
          name: !!name,
          code: !!code,
          type: !!type,
          startDate: !!startDate,
          targetCount: !!targetCount,
          manager: !!manager
        });
        return res.status(400).json({
          success: false,
          message: '请填写所有必填字段（批次名称、编号、类型、开始日期、目标数量、负责人）'
        });
      }

      // 检查批次编号是否已存在
      const existingBatch = await CattleBatch.findOne({
        where: { code }
      });

      if (existingBatch) {
        console.log('❌ [后端-批次设置] 批次编号已存在:', code);
        return res.status(400).json({
          success: false,
          message: '批次编号已存在'
        });
      }

      // 检查农场是否存在
      const farm = await Farm.findByPk(farmId);
      if (!farm) {
        console.log('❌ [后端-批次设置] 农场不存在:', farmId);
        return res.status(400).json({
          success: false,
          message: '农场不存在'
        });
      }

      // 准备创建数据
      const createData = {
        name,
        code,
        type,
        startDate: new Date(startDate),
        expectedEndDate: expectedEndDate ? new Date(expectedEndDate) : null,
        actualEndDate: actualEndDate ? new Date(actualEndDate) : null,
        targetCount: parseInt(targetCount),
        currentCount: currentCount ? parseInt(currentCount) : 0,
        manager,
        status: status || '进行中',
        remark: remark || '',
        farmId: farmId || 1
      };

      console.log('📝 [后端-批次设置] 准备创建的数据:', createData);

      const batch = await CattleBatch.create(createData);

      console.log('✅ [后端-批次设置] 批次创建成功:', batch.id);

      res.status(201).json({
        success: true,
        data: batch,
        message: '创建批次成功'
      });
    } catch (error) {
      console.error('❌ [后端-批次设置] 创建失败:', error);
      res.status(500).json({
        success: false,
        message: '创建批次失败',
        error: error.message
      });
    }
  }

  /**
   * 更新批次
   */
  async updateBatch(req, res) {
    try {
      const { id } = req.params;
      const updateData = req.body;

      console.log('🔄 [后端-批次设置] 开始更新操作');
      console.log('📋 [后端-批次设置] 请求参数:', {
        batchId: id,
        updateData: updateData
      });

      const batch = await CattleBatch.findByPk(id);
      if (!batch) {
        console.log('❌ [后端-批次设置] 批次不存在，ID:', id);
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      console.log('📝 [后端-批次设置] 原始批次数据:', {
        id: batch.id,
        name: batch.name,
        code: batch.code,
        type: batch.type,
        description: batch.description,
        status: batch.status,
        startDate: batch.startDate,
        expectedEndDate: batch.expectedEndDate,
        actualEndDate: batch.actualEndDate,
        targetCount: batch.targetCount,
        currentCount: batch.currentCount,
        manager: batch.manager,
        remark: batch.remark,
        farmId: batch.farmId
      });

      // 如果更新编号，检查是否已存在
      if (updateData.code && updateData.code !== batch.code) {
        console.log('🔄 [后端-批次设置] 检测到编号变更，检查是否已存在');
        console.log('📝 [后端-批次设置] 编号变更详情:', {
          oldCode: batch.code,
          newCode: updateData.code
        });
        
        const existingBatch = await CattleBatch.findOne({
          where: { code: updateData.code, id: { [Op.ne]: id } }
        });

        if (existingBatch) {
          console.log('❌ [后端-批次设置] 批次编号已存在');
          return res.status(400).json({
            success: false,
            message: '批次编号已存在'
          });
        }
        console.log('✅ [后端-批次设置] 批次编号可用');
      }

      await batch.update(updateData);
      console.log('✅ [后端-批次设置] 批次更新成功');

      res.json({
        success: true,
        data: batch,
        message: '更新批次成功'
      });
    } catch (error) {
      console.error('❌ [后端-批次设置] 更新失败:', error);
      res.status(500).json({
        success: false,
        message: '更新批次失败',
        error: error.message
      });
    }
  }

  /**
   * 删除批次
   */
  async deleteBatch(req, res) {
    try {
      const { id } = req.params;

      const batch = await CattleBatch.findByPk(id);
      if (!batch) {
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      // 检查是否有牛只在批次中
      const animalCount = await CattleBatchAnimal.count({
        where: { batchId: id }
      });

      if (animalCount > 0) {
        return res.status(400).json({
          success: false,
          message: '批次中还有牛只，无法删除'
        });
      }

      await batch.destroy();

      res.json({
        success: true,
        message: '删除批次成功'
      });
    } catch (error) {
      console.error('删除批次失败:', error);
      res.status(500).json({
        success: false,
        message: '删除批次失败',
        error: error.message
      });
    }
  }

  /**
   * 批量删除批次
   */
  async batchDeleteBatches(req, res) {
    try {
      const { ids } = req.body;

      if (!ids || !Array.isArray(ids) || ids.length === 0) {
        return res.status(400).json({
          success: false,
          message: '请选择要删除的批次'
        });
      }

      // 检查是否有批次包含牛只
      const animalCount = await CattleBatchAnimal.count({
        where: { batchId: { [Op.in]: ids } }
      });

      if (animalCount > 0) {
        return res.status(400).json({
          success: false,
          message: '部分批次中还有牛只，无法删除'
        });
      }

      await CattleBatch.destroy({
        where: { id: { [Op.in]: ids } }
      });

      res.json({
        success: true,
        message: `成功删除 ${ids.length} 个批次`
      });
    } catch (error) {
      console.error('批量删除批次失败:', error);
      res.status(500).json({
        success: false,
        message: '批量删除批次失败',
        error: error.message
      });
    }
  }

  /**
   * 获取批次中的牛只
   */
  async getBatchAnimals(req, res) {
    try {
      const { id } = req.params;
      const { page = 1, pageSize = 10 } = req.query;
      const offset = (page - 1) * pageSize;

      // 检查批次是否存在
      const batch = await CattleBatch.findByPk(id);
      if (!batch) {
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      // 获取批次中的牛只
      const { count, rows } = await IotCattle.findAndCountAll({
        include: [
          {
            model: CattleBatchAnimal,
            as: 'batchAnimals',
            where: { batchId: id },
            attributes: ['id', 'joinDate', 'notes']
          },
          {
            model: Farm,
            as: 'farm',
            attributes: ['id', 'name']
          }
        ],
        attributes: ['id', 'earNumber', 'sex', 'strain', 'orgId'],
        limit: parseInt(pageSize),
        offset: offset,
        order: [['earNumber', 'ASC']]
      });

      res.json({
        success: true,
        data: {
          list: rows,
          total: count,
          page: parseInt(page),
          pageSize: parseInt(pageSize)
        },
        message: '获取批次牛只成功'
      });
    } catch (error) {
      console.error('获取批次牛只失败:', error);
      res.status(500).json({
        success: false,
        message: '获取批次牛只失败',
        error: error.message
      });
    }
  }

  /**
   * 添加牛只到批次
   */
  async addAnimalsToBatch(req, res) {
    try {
      const { id } = req.params;
      const { animalIds } = req.body;

      if (!animalIds || !Array.isArray(animalIds) || animalIds.length === 0) {
        return res.status(400).json({
          success: false,
          message: '请选择要添加的牛只'
        });
      }

      // 检查批次是否存在
      const batch = await CattleBatch.findByPk(id);
      if (!batch) {
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      // 检查牛只是否存在
      const animals = await IotCattle.findAll({
        where: { id: { [Op.in]: animalIds } }
      });

      if (animals.length !== animalIds.length) {
        return res.status(400).json({
          success: false,
          message: '部分牛只不存在'
        });
      }

      // 检查哪些牛只已经在批次中
      const existingAssociations = await CattleBatchAnimal.findAll({
        where: {
          batchId: id,
          animalId: { [Op.in]: animalIds }
        }
      });

      const existingAnimalIds = existingAssociations.map(assoc => assoc.animalId);
      const newAnimalIds = animalIds.filter(id => !existingAnimalIds.includes(id));

      if (newAnimalIds.length === 0) {
        return res.status(400).json({
          success: false,
          message: '所有牛只都已在该批次中'
        });
      }

      // 添加新的关联
      const associations = newAnimalIds.map(animalId => ({
        batchId: id,
        animalId: animalId,
        joinDate: new Date()
      }));

      await CattleBatchAnimal.bulkCreate(associations);

      res.json({
        success: true,
        message: `成功添加 ${newAnimalIds.length} 头牛只到批次`,
        data: {
          addedCount: newAnimalIds.length,
          skippedCount: existingAnimalIds.length
        }
      });
    } catch (error) {
      console.error('添加牛只到批次失败:', error);
      res.status(500).json({
        success: false,
        message: '添加牛只到批次失败',
        error: error.message
      });
    }
  }

  /**
   * 从批次中移除牛只
   */
  async removeAnimalFromBatch(req, res) {
    try {
      const { id, animalId } = req.params;

      // 检查批次是否存在
      const batch = await CattleBatch.findByPk(id);
      if (!batch) {
        return res.status(404).json({
          success: false,
          message: '批次不存在'
        });
      }

      // 检查关联是否存在
      const association = await CattleBatchAnimal.findOne({
        where: { batchId: id, animalId }
      });

      if (!association) {
        return res.status(404).json({
          success: false,
          message: '牛只不在该批次中'
        });
      }

      await association.destroy();

      res.json({
        success: true,
        message: '从批次中移除牛只成功'
      });
    } catch (error) {
      console.error('从批次中移除牛只失败:', error);
      res.status(500).json({
        success: false,
        message: '从批次中移除牛只失败',
        error: error.message
      });
    }
  }
}

module.exports = new CattleBatchController();