17168ERP/web/App_Code/api/statisticsController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;

/// <summary>
/// statisticsController 的摘要描述
/// </summary>
public class statisticsController: ApiController
{
    //獲取於活動統計相關的數據

    private Model.ezEntities _db = new Model.ezEntities();
    public statisticsController()
    {
        //
        // TODO: 在這裡新增建構函式邏輯
        //
    }
    [HttpPost]
    [Route("api/statistics/activitylist")]
    public IHttpActionResult GetStatisticsActivityList()
    {
        //獲取活動列表
        var activityList = _db.activities.OrderByDescending(x => x.reg_time).ToList();
        return Ok(activityList);
    }
    [HttpPost]
    [Route("api/statistics/activitycountlist")]
    public IHttpActionResult GetActivityCountList(int page=1,int pagesize=10, [FromUri] string[] sortby = null, [FromUri] bool[] sortdesc = null )
    {
        //獲取多個活動統計列表，如果一個獲取超過五十個，則返回空
        if (pagesize > 50)
        {
            return Ok();
        }
        var qry = _db.activities.OrderByDescending(x => x.reg_time);
        var data = qry.Skip((page - 1) * pagesize).Take(pagesize).ToList();
        var list = new
        {
            items = data.Select(x => new
            {
                id = x.num,
                order_count = x.pro_order.Count(),
                pw_count = x.pro_order.SelectMany(b => b.pro_order_detail).Count(),
                activity_name = x.subject,
                receivable = x.pro_order.SelectMany(a => a.pro_order_detail).Select(c => c.price).Sum(),
                startdate = x.startDate_solar,
                enddate = x.endDate_solar,
                //register_status = EnumHelper.GetDescription((ActivityRegisterStatus)x.ActivityRegisterStatus),
                //hold_status = EnumHelper.GetDescription((ActivityHoldStatus)x.ActivityHoldStatus),
                //gdz_peoples = x.pro_order.SelectMany(a => a.pro_order_detail).Where(b => b.actItem?.actItem_kind?.IsGDZ == true).Count(),
            }),
            count =qry.Count()
        };
        return Ok(list);
    }
    [HttpPost]
    [Route("api/statistics/activitycount")]
    public IHttpActionResult GetActivityCount(int id)
    {
        //獲取單個活動統計數據
        var qry = _db.activities.Where(a => a.num == id);
        if (qry == null)
        {
            return Ok();
        }
        var data = new
        {
            list = qry.Select(a => new
            {
                id = a.num,
                order_count = a.pro_order.Count(),
                order_price_total = a.pro_order.SelectMany(b => b.pro_order_detail).Select(c => c.price).Sum()
            })


        };
        return Ok(data);
    }

    [HttpPost]
    [Route("api/statistics/GDZCount")]
    public IHttpActionResult GetActivityGDZCount(int activity_num)
    {
        var qry = _db.pro_order_detail.Include("follower").Where(a => a.pro_order.activity_num == activity_num);
        if (qry == null)
        {
            return Ok();
        }
        var data = new
        {
            all_count = _db.pro_order.Where(a => a.activity_num == activity_num).Count(),
            all_gdz_count = qry
                            .Where(a => a.actItem.act_bom.Any(b => b.package_num == null && b.item_num == a.actItem_num))
                            .Select(a => a.order_no)
                            .Distinct()
                            .Count(),
            gdz_item_counts = qry.Where(a => !a.actItem.subject.Contains("大牌位"))       
                .GroupBy(a => new
                {
                    item_num = a.actItem.num,
                    item_name = a.actItem.subject,
                    price = a.actItem.price
                })
                .Select(g => new
                {
                    item_num = g.Key.item_num,
                    item_name = g.Key.item_name,
                    price = g.Key.price,
                    count = g.Count(),//功德項目的數量
                    total_price = g.Where(x => x.price != null).Sum(x => x.price),
                    // ⚠️ 潛在 N+1 查詢：在 GroupBy 投影中執行新查詢
                    // g.Select(...).ToList() 會立即執行，然後用 Contains 做子查詢
                    // 若 g 數量很多，建議重構為 join 或分兩階段查詢以提升效能
                    followers = _db.pro_order
                             .Where(h => g.Select(x => x.order_no).Distinct().ToList().Contains(h.order_no))
                             .Select(k => k.follower.u_name)
                             .Distinct()
                             .ToList(),

                    amountsByFollower = g
                                        .GroupBy(x => x.pro_order.follower.u_name)
                                        .Select(fg => new
                                        {
                                            follower = fg.Key,
                                            amount = fg.Where(x => x.price != null).Sum(x => x.price)
                                        })
                                        .ToList()
                })
                .OrderByDescending(x => x.price)
                .ToList()

        };
        return Ok(data);
    }
}