using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MyCode.Project.Infrastructure.Exceptions;

namespace MyCode.Project.Infrastructure.Imports
{
    /// <summary>
    /// 导入Excel数据任务
    /// </summary>
    public class ImportExcelProcess<T>:IImportExcelProcess where T:class ,new()
    {
        /// <summary>
        /// 导入数据对应的配置实体
        /// </summary>
        public ImportConfig<T> Config { get; protected set; }

        /// <summary>
        /// 导入数据方法
        /// </summary>
        private ImportEvent<T> ImportFunc;

        /// <summary>
        /// 获取数据方法
        /// </summary>
        private GetDataEvent<T> GetDataFunc;

        /// <summary>
        /// 初始化一个<see cref="ImportExcelProcess{T}"/>类型的实例
        /// </summary>
        /// <param name="config">导入配置</param>
        /// <param name="func">导入方法</param>
        public ImportExcelProcess(ImportConfig<T> config, ImportEvent<T> func)
        {
            this.Config = config;
            this.ImportFunc = func;
        }

        /// <summary>
        /// 初始化一个<see cref="ImportExcelProcess{T}"/>类型的实例
        /// </summary>
        /// <param name="config">导入配置</param>
        /// <param name="func">获取数据方法</param>
        public ImportExcelProcess(ImportConfig<T> config, GetDataEvent<T> func)
        {
            this.Config = config;
            this.GetDataFunc = func;
        }

        #region RunImportExcelProcess(执行导入Excel数据的方法)
        /// <summary>
        /// 执行导入Excel数据的方法
        /// </summary>
        public ImportResult RunImportExcelProcess()
        {
            if (ImportFunc == null) { throw new BaseException("没有找到导入数据的方法!"); }
            
            ImportResult result=new ImportResult();
            var msg = "";

            //验证是否字段都有
            if (!this.Config.ValidFormat(ref msg)) { throw new BaseException(msg); }

            //获取Excel数据
            var sourceData = this.Config.ExcelUtil.ExcelToList();

            //将对象转成List<T>
            var resultData = this.Config.GetListData(sourceData);

            //执行导入的方法
            var tmpResult = this.ImportFunc(resultData);

            var importResult = tmpResult as ImportResult;

            if (importResult != null)
            {
                result.InsertCount += importResult.InsertCount;
                result.UpdateCount += (tmpResult as ImportResult).UpdateCount;
            }

            return result;

        }
        #endregion

        #region GetImportExcelData(获取导入Excel数据的方法)
        /// <summary>
        /// 获取导入Excel数据的方法
        /// </summary>
        public List<object> GetImportExcelData()
        {
            if (GetDataFunc == null) { throw new BaseException("没有找到导入数据的方法!"); }
            
            var msg = "";
            if (!this.Config.ValidFormat(ref msg))
            {
                throw new BaseException(msg);
            }
            //获取Excel数据
            var sourceData = this.Config.ExcelUtil.ExcelToList();

            List<object> result = new List<object>();

            var resultData = this.Config.GetListData(sourceData);

            if (resultData != null)
            {
                var tmpResult = this.GetDataFunc(resultData);

                if (tmpResult != null)
                {
                    result.AddRange(tmpResult);
                }
                else
                {
                    return result;
                }
            }
            else
            {
                return result;
            }

            return result;
        }
        #endregion
    }
}