using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
using Common.Utils;
using Server.Services.DataMigration;

namespace Server.Controllers.OpenManagement
{
    /// <summary>
    /// 数据迁移Api
    /// </summary>
    public class DataMigrationController : DefaultController
    {
        private const string defaultTempPath = "Temp";

        /// <summary>
        /// 上传数据
        /// </summary>
        /// <returns></returns>
        [HttpPost, ErrorFilter]
        public WebResult Upload()
        {
            //替换只允许修改文件
            var provider = new MultipartMemoryStreamProvider();
            var r = Request.Content.ReadAsMultipartAsync(provider).Result;
            System.Net.Http.StreamContent item = null;
            foreach (var content in r.Contents)
            {
                switch (content.Headers.ContentDisposition.Name.Replace("\"", ""))
                {
                    case "File":
                        item = content as System.Net.Http.StreamContent;
                        break;
                }
            }
            var fileName = Util.MapFile("datamigration.zip", defaultTempPath);
            //删除旧数据
            Util.DeleteFile(fileName);
            using (var ms = item.ReadAsStreamAsync().Result)
            {
                try
                {
                    using (var filems = File.OpenWrite(fileName))
                    {
                        ms.CopyTo(filems);
                    }
                }
                catch (Exception ex)
                {
                    //如果新增失败，删掉无效文件
                    Util.DeleteFile(fileName);
                    return PutData(ex);
                }
            }
            return PutSuccess;
        }
        /// <summary>
        /// 检查上传的数据
        /// </summary>
        /// <returns></returns>
        [HttpPost, ErrorFilter]
        public WebResult Check()
        {
            var fileName = Util.MapFile("datamigration.zip", defaultTempPath);
            if (!File.Exists(fileName))
            {
                return PutData("请先上传数据。");
            }
            var err = DataMigrationManageSerivce.Instance.Check(fileName);
            if (string.IsNullOrWhiteSpace(err))
            {
                return PutSuccess;
            }
            return PutData(err);
        }
        /// <summary>
        /// 开始导入
        /// </summary>
        /// <returns></returns>
        [HttpPost, ErrorFilter]
        public WebResult OpenImport()
        {
            var state = DataMigrationProgressService.Instance.GetState();
            if (state != null && state.State == 1)
            {
                return PutData("后台已经正在处理中，请不要重复操作。");
            }
            var fileName = Util.MapFile("datamigration.zip", defaultTempPath);
            if (!File.Exists(fileName))
            {
                return PutData("请先上传数据。");
            }
            var err = DataMigrationManageSerivce.Instance.Start(fileName);
            if (string.IsNullOrWhiteSpace(err))
            {
                return PutSuccess;
            }
            return PutData(err);
        }
        /// <summary>
        /// 获取进度
        /// </summary>
        /// <returns></returns>
        [HttpPost, ErrorFilter]
        public WebResult GetProgress()
        {
            var state = DataMigrationProgressService.Instance.GetState();
            if (state == null)
            {
                return PutData("当前还未开始");
            }
            return PutData(new
            {
                StartDateTime = state.StartDateTime,
                EndDateTime = state.EndDateTime,
                Logs = state.Logs.ToArray(),
                State = state.State,
                ElapsedTime = state.ElapsedTime.ToString("0.00")
            });
        }
    }
}