<template>
  <div class="app-container">
    <el-form :model="queryParams" ref="queryForm" :inline="true" v-show="showSearch" label-width="90px">
      <el-form-item label="商品名称" prop="productName">
        <el-input
          v-model="queryParams.productName"
          placeholder="请输入商品名称"
          clearable
          size="small"
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item label="状态" prop="status">
        <el-select v-model="queryParams.status" placeholder="请选择状态" clearable size="small">
          <el-option label="上架" :value="1"/>
          <el-option label="下架" :value="0"/>
        </el-select>
      </el-form-item>
      <el-form-item label="活动时间" prop="timeRange">
        <el-date-picker
          v-model="queryParams.timeRange"
          type="datetimerange"
          range-separator="-"
          start-placeholder="开始日期"
          end-placeholder="结束日期"
          value-format="yyyy-MM-dd HH:mm:ss"
          size="small"
        />
      </el-form-item>
      <el-form-item>
        <el-button type="cyan" icon="el-icon-search" size="mini" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button type="primary" icon="el-icon-plus" size="mini" @click="handleAdd" v-hasPermi="['store:productDiscount:add']">新增</el-button>
      </el-col>
<!--      <el-col :span="1.5">-->
<!--        <el-button type="warning" icon="el-icon-download" size="mini" @click="handleExport" v-hasPermi="['store:productDiscount:export']">导出</el-button>-->
<!--      </el-col>-->
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>

    <el-table v-loading="loading" :data="list" border>
      <el-table-column label="序号" type="index" width="55" align="center" />
      <el-table-column label="商品信息" align="center" min-width="200">
        <template slot-scope="scope">
          <div style="display:flex;align-items:center;">
            <el-image v-if="scope.row.productImage" style="width:50px;height:50px;margin-right:10px;" :src="scope.row.productImage" fit="contain" :preview-src-list="[scope.row.productImage]"/>
            <span>{{ scope.row.productName || '-' }}</span>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="原价" align="center" prop="originalPrice" width="100">
        <template slot-scope="scope">
          <span v-if="scope.row.originalPrice != null">¥{{ scope.row.originalPrice.toFixed(2) }}</span>
        </template>
      </el-table-column>
      <el-table-column label="折扣" align="center" prop="discount" width="80">
        <template slot-scope="scope">
          <span>{{ (scope.row.discount * 10).toFixed(1) }}折</span>
        </template>
      </el-table-column>
      <el-table-column label="折扣价格" align="center" prop="discountPrice" width="110">
        <template slot-scope="scope">
          <span style="color:#f56c6c;font-weight:bold;">¥{{ scope.row.discountPrice ? scope.row.discountPrice.toFixed(2) : '0.00' }}</span>
        </template>
      </el-table-column>
      <el-table-column label="库存" align="center" prop="stock" width="80" />
      <el-table-column label="开始时间" align="center" prop="startTime" width="160">
        <template slot-scope="scope">
          <span>{{ parseTime(scope.row.startTime, '{y}-{m}-{d} {h}:{i}:{s}') }}</span>
        </template>
      </el-table-column>
      <el-table-column label="结束时间" align="center" prop="endTime" width="160">
        <template slot-scope="scope">
          <span>{{ parseTime(scope.row.endTime, '{y}-{m}-{d} {h}:{i}:{s}') }}</span>
        </template>
      </el-table-column>
      <el-table-column label="状态" align="center" prop="status" width="80">
        <template slot-scope="scope">
          <el-tag v-if="scope.row.status === 1" type="success">上架</el-tag>
          <el-tag v-else type="info">下架</el-tag>
        </template>
      </el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width" width="180">
        <template slot-scope="scope">
          <el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)" v-hasPermi="['store:productDiscount:edit']">编辑</el-button>
          <el-button size="mini" type="text" icon="el-icon-delete" @click="handleDelete(scope.row)" v-hasPermi="['store:productDiscount:remove']">删除</el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination v-show="total>0" :total="total" :page.sync="queryParams.pageNum" :limit.sync="queryParams.pageSize" @pagination="getList" />

    <!-- 添加/编辑限时折扣 - 支持批量选择商品 -->
    <el-dialog :title="title" :visible.sync="open" width="800px" append-to-body>
      <el-alert
        v-if="!form.id && selectedProducts.length === 0"
        title="提示：可批量选择多个商品，统一设置折扣信息后一键添加"
        type="info"
        :closable="false"
        show-icon
        style="margin-bottom:15px;"
      />

      <el-form ref="form" :model="form" :rules="rules" label-width="100px">
        <!-- 批量选择商品 -->
        <el-form-item label="选择商品" prop="productIds" v-if="!form.id">
          <el-select
            v-model="selectedProducts"
            multiple
            filterable
            remote
            reserve-keyword
            placeholder="请输入商品名称搜索，可多选"
            :remote-method="searchProduct"
            :loading="productLoading"
            style="width:100%"
            collapse-tags
            collapse-tags-tooltip
          >
            <el-option
              v-for="item in productOptions"
              :key="item.productId"
              :label="item.productName"
              :value="item.productId"
              :disabled="isProductSelected(item.productId)"
            >
              <div style="display:flex;justify-content:space-between;align-items:center;">
                <span style="float:left">{{ item.productName }}</span>
                <span style="float:right;color:#8492a6;font-size:12px;margin-left:15px;">ID:{{ item.productId }} | ¥{{ item.price || item.originalPrice || '-' }}</span>
              </div>
            </el-option>
          </el-select>
          <div style="color:#909399;font-size:12px;margin-top:5px;" v-if="selectedProducts.length > 0">
            已选择 {{ selectedProducts.length }} 个商品
          </div>
        </el-form-item>

        <!-- 编辑模式显示单个商品 -->
        <el-form-item label="选择商品" prop="productId" v-if="form.id">
          <el-select
            v-model="form.productId"
            filterable
            remote
            reserve-keyword
            placeholder="请输入商品名称搜索"
            :remote-method="searchProduct"
            :loading="productLoading"
            style="width:100%"
            disabled
          >
            <el-option v-for="item in productOptions" :key="item.productId" :label="item.productName" :value="item.productId"/>
          </el-select>
        </el-form-item>

        <!-- 公共设置项 -->
        <el-divider content-position="left">折扣设置（以下设置将应用于所有选中商品）</el-divider>

        <el-row :gutter="20">
          <el-col :span="12">
            <el-form-item label="原价" prop="originalPrice">
              <el-input-number v-model="form.originalPrice" :precision="2" :min="0" placeholder="请输入原价" style="width:100%" @change="handleOriginalPriceChange"/>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="库存" prop="stock">
              <el-input-number v-model="form.stock" :min="0" placeholder="请输入库存数量" style="width:100%"/>
            </el-form-item>
          </el-col>
        </el-row>

        <!-- 折扣滑块：支持小数步长 0.1 -->
        <el-form-item label="折扣" prop="discount" class="discount-slider-item">
          <el-slider
            v-model="form.discountValue"
            :marks="discountMarks"
            :min="1"
            :max="10"
            :step="0.1"
            show-input
            @change="handleDiscountChange"
          />
        </el-form-item>

        <el-form-item label="折扣价格" prop="discountPrice">
          <el-input-number v-model="form.discountPrice" :precision="2" :min="0" placeholder="自动计算或手动输入" style="width:100%" @change="handleDiscountPriceChange"/>
        </el-form-item>

        <el-row :gutter="20">
          <el-col :span="12">
            <el-form-item label="开始时间" prop="startTime">
              <el-date-picker v-model="form.startTime" type="datetime" placeholder="选择开始时间" value-format="yyyy-MM-dd HH:mm:ss" style="width:100%"/>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="结束时间" prop="endTime">
              <el-date-picker v-model="form.endTime" type="datetime" placeholder="选择结束时间" value-format="yyyy-MM-dd HH:mm:ss" style="width:100%"/>
            </el-form-item>
          </el-col>
        </el-row>

        <el-form-item label="状态" prop="status">
          <el-radio-group v-model="form.status">
            <el-radio :label="1">上架</el-radio>
            <el-radio :label="0">下架</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="备注" prop="remark">
          <el-input v-model="form.remark" type="textarea" placeholder="请输入备注" :rows="3"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm" :loading="submitLoading">{{ form.id ? '确 定' : `确 定 (${selectedProducts.length}个商品)` }}</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import {
  addProductDiscount,
  delProductDiscount,
  getProductDiscount,
  listProductDiscount,
  updateProductDiscount
} from '@/api/hisStore/productDiscount'
import { getStoreProduct, listStoreProduct } from '@/api/hisStore/storeProduct'

export default {
  name: 'ProductDiscount',
  data() {
    return {
      loading: true,
      showSearch: true,
      list: [],
      total: 0,
      title: '',
      open: false,
      submitLoading: false,
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        productName: null,
        status: null,
        timeRange: null,
        beginTime: null,
        endTime: null
      },
      form: {},
      rules: {
        originalPrice: [{ required: true, message: '请输入原价', trigger: 'blur' }],
        discount: [{ required: true, message: '请设置折扣', trigger: 'change' }],
        discountPrice: [{ required: true, message: '请输入折扣价格', trigger: 'blur' }],
        stock: [{ required: true, message: '请输入库存', trigger: 'blur' }],
        startTime: [{ required: true, message: '请选择开始时间', trigger: 'change' }],
        endTime: [{ required: true, message: '请选择结束时间', trigger: 'change' }],
        status: [{ required: true, message: '请选择状态', trigger: 'change' }]
      },
      productLoading: false,
      productOptions: [],
      selectedProducts: [],
      discountMarks: {
        1: '1折',
        5: '5折',
        10: '不打折'
      }
    }
  },
  watch: {
    'form.discountValue': {
      handler(newVal) {
        if (newVal !== undefined && newVal !== null) {
          this.form.discount = newVal / 10
          this.$nextTick(() => {
            this.calcDiscountPrice()
          })
        }
      },
      immediate: true
    }
  },
  created() {
    this.getList()
  },
  methods: {
    getList() {
      this.loading = true
      const params = { ...this.queryParams }
      if (this.queryParams.timeRange && this.queryParams.timeRange.length === 2) {
        params.beginTime = this.queryParams.timeRange[0]
        params.endTime = this.queryParams.timeRange[1]
      }
      delete params.timeRange
      listProductDiscount(params).then(response => {
        this.list = response.rows || []
        this.total = response.total || 0
        this.loading = false
      })
    },

    searchProduct(query) {
      if (query !== '') {
        this.productLoading = true
        listStoreProduct({ productName: query, isDel: 0, pageSize: 50 }).then(response => {
          const currentSelected = this.selectedProducts.map(id =>
            this.productOptions.find(p => p.productId === id)
          ).filter(Boolean)
          this.productOptions = [...currentSelected, ...(response.rows || [])]
          this.productLoading = false
        })
      } else {
        if (this.selectedProducts.length > 0) {
          this.productOptions = this.selectedProducts.map(id =>
            this.productOptions.find(p => p.productId === id)
          ).filter(Boolean)
        } else {
          this.productOptions = []
        }
      }
    },

    isProductSelected(productId) {
      return this.selectedProducts.includes(productId)
    },

    handleOriginalPriceChange(val) {
      this.calcDiscountPrice()
    },

    handleDiscountChange(val) {
      this.form.discount = this.form.discountValue / 10
      this.calcDiscountPrice()
    },

    handleDiscountPriceChange(val) {
      if (this.form.originalPrice && this.form.originalPrice > 0 && val >= 0) {
        const newDiscount = parseFloat((val / this.form.originalPrice).toFixed(4))
        if (newDiscount >= 0.1 && newDiscount <= 1) {
          this.form.discountValue = newDiscount * 10
          this.form.discount = newDiscount
        }
      }
    },

    calcDiscountPrice() {
      if (this.form.originalPrice && this.form.originalPrice > 0 && this.form.discount !== undefined && this.form.discount !== null) {
        if (this.form.discount >= 1) {
          this.form.discountPrice = this.form.originalPrice
        } else {
          this.form.discountPrice = parseFloat((this.form.originalPrice * this.form.discount).toFixed(2))
        }
      } else {
        if (!this.form.originalPrice || this.form.originalPrice <= 0) {
          this.form.discountPrice = null
        }
      }
    },

    cancel() {
      this.open = false
      this.reset()
    },

    reset() {
      this.form = {
        id: null,
        productId: null,
        stock: 0,
        originalPrice: null,
        discount: 1,
        discountValue: 10,
        discountPrice: null,
        startTime: null,
        endTime: null,
        status: 1,
        remark: null
      }
      this.selectedProducts = []
      this.productOptions = []
      this.submitLoading = false
      this.resetForm('form')
    },

    handleQuery() {
      this.queryParams.pageNum = 1
      this.getList()
    },

    resetQuery() {
      this.resetForm('queryForm')
      this.handleQuery()
    },

    handleAdd() {
      this.reset()
      this.open = true
      this.title = '批量添加限时折扣'
    },

    handleUpdate(row) {
      this.reset()
      getProductDiscount(row.id).then(response => {
        this.form = response.data
        if (this.form.discount) {
          this.form.discountValue = this.form.discount * 10
        }
        if (this.form.productId) {
          getStoreProduct(this.form.productId).then(res => {
            if (res.data) {
              this.productOptions = [res.data]
            }
          })
        }
        this.selectedProducts = [this.form.productId]
        this.open = true
        this.title = '编辑限时折扣'
      })
    },

    handleDelete(row) {
      const ids = row.id
      this.$confirm('是否确认删除限时折扣编号为"' + ids + '"的数据项?', '警告', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return delProductDiscount(ids)
      }).then(() => {
        this.getList()
        this.msgSuccess('删除成功')
      }).catch(() => {})
    },

    handleExport() {
      this.download('/store/store/productDiscount/export', {
        ...this.queryParams
      }, `productDiscount_${new Date().getTime()}.xlsx`)
    },

    async submitForm() {
      if (!this.form.id && this.selectedProducts.length === 0) {
        this.msgError('请至少选择一个商品')
        return
      }

      try {
        await this.$refs['form'].validate()

        this.submitLoading = true

        if (this.form.id) {
          const submitData = { ...this.form }
          delete submitData.discountValue
          delete submitData.productIds

          await updateProductDiscount(submitData)
          this.msgSuccess('修改成功')
          this.open = false
          this.getList()
        } else {
          const baseData = { ...this.form }
          delete baseData.id
          delete baseData.productId
          delete baseData.discountValue
          delete baseData.productIds

          const promises = this.selectedProducts.map(productId => {
            const productData = {
              ...baseData,
              productId: productId
            }
            return addProductDiscount(productData)
          })

          await Promise.all(promises)
          this.msgSuccess(`成功添加 ${this.selectedProducts.length} 个限时折扣商品`)
          this.open = false
          this.getList()
        }

        this.submitLoading = false
      } catch (error) {
        console.error('提交失败:', error)
        this.submitLoading = false
        if (error !== 'cancel') {
          this.msgError(error.message || '操作失败，请重试')
        }
      }
    }
  }
}
</script>

<style scoped>
.discount-slider-item >>> .el-slider {
  overflow: visible;
  margin: 0 10px;
}
.discount-slider-item >>> .el-slider__marks-text {
  white-space: nowrap;
  font-size: 12px;
  transform: translateX(-50%) scale(0.95);
  min-width: 40px;
  text-align: center;
}
.discount-slider-item >>> .el-slider__marks {
  height: 30px;
}

/* 多选下拉框优化 */
>>> .el-select .el-tag {
  max-width: 150px;
}
>>> .el-select .el-tag__close {
  margin-left: 4px;
}
</style>
