using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using Newtonsoft.Json;
using FCOMMON;

namespace Project.Web
{
    public partial class MachineBridge
    {
        #region Holiday API (월별근무표)

        /// <summary>
        /// 월별근무표 목록 조회
        /// </summary>
        public string Holiday_GetList(string month)
        {
            try
            {
                var monthPattern = month + "%";
                var sql = @"SELECT idx, pdate, free, memo, wuid, wdate
                           FROM HolidayList WITH (nolock)
                           WHERE pdate LIKE @month
                           ORDER BY pdate";

                var cs = Properties.Settings.Default.gwcs;
                using (var cn = new SqlConnection(cs))
                using (var cmd = new SqlCommand(sql, cn))
                {
                    cmd.Parameters.AddWithValue("@month", monthPattern);
                    using (var da = new SqlDataAdapter(cmd))
                    {
                        var dt = new DataTable();
                        da.Fill(dt);
                        return JsonConvert.SerializeObject(new { Success = true, Data = dt });
                    }
                }
            }
            catch (Exception ex)
            {
                return JsonConvert.SerializeObject(new { Success = false, Message = ex.Message });
            }
        }

        /// <summary>
        /// 월별근무표 저장 (없으면 생성)
        /// </summary>
        public string Holiday_Save(string month, string holidaysJson)
        {
            try
            {
                var holidays = JsonConvert.DeserializeObject<List<HolidayItem>>(holidaysJson);
                var cs = Properties.Settings.Default.gwcs;

                using (var cn = new SqlConnection(cs))
                {
                    cn.Open();
                    using (var tran = cn.BeginTransaction())
                    {
                        try
                        {
                            foreach (var item in holidays)
                            {
                                var sql = @"
                                    IF EXISTS (SELECT 1 FROM HolidayList WHERE pdate = @pdate)
                                        UPDATE HolidayList SET free = @free, memo = @memo, wuid = @wuid, wdate = GETDATE() WHERE pdate = @pdate
                                    ELSE
                                        INSERT INTO HolidayList (pdate, free, memo, wuid, wdate) VALUES (@pdate, @free, @memo, @wuid, GETDATE())";

                                using (var cmd = new SqlCommand(sql, cn, tran))
                                {
                                    cmd.Parameters.AddWithValue("@pdate", item.pdate);
                                    cmd.Parameters.AddWithValue("@free", item.free);
                                    cmd.Parameters.AddWithValue("@memo", item.memo ?? "");
                                    cmd.Parameters.AddWithValue("@wuid", info.Login.no);
                                    cmd.ExecuteNonQuery();
                                }
                            }
                            tran.Commit();
                            return JsonConvert.SerializeObject(new { Success = true, Message = "저장되었습니다." });
                        }
                        catch
                        {
                            tran.Rollback();
                            throw;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                return JsonConvert.SerializeObject(new { Success = false, Message = ex.Message });
            }
        }

        /// <summary>
        /// 월별근무표 초기 데이터 생성 (해당 월에 데이터가 없을 때)
        /// </summary>
        public string Holiday_Initialize(string month)
        {
            try
            {
                // 해당 월 데이터 존재 여부 확인
                var monthPattern = month + "%";
                var checkSql = "SELECT COUNT(*) FROM HolidayList WITH (nolock) WHERE pdate LIKE @month";
                var cs = Properties.Settings.Default.gwcs;

                using (var cn = new SqlConnection(cs))
                {
                    cn.Open();

                    using (var checkCmd = new SqlCommand(checkSql, cn))
                    {
                        checkCmd.Parameters.AddWithValue("@month", monthPattern);
                        var count = (int)checkCmd.ExecuteScalar();

                        if (count > 0)
                        {
                            return JsonConvert.SerializeObject(new { Success = true, Message = "이미 데이터가 존재합니다.", Created = false });
                        }
                    }

                    // 해당 월의 모든 날짜 생성
                    var startDate = DateTime.Parse(month + "-01");
                    var endDate = startDate.AddMonths(1).AddDays(-1);

                    using (var tran = cn.BeginTransaction())
                    {
                        try
                        {
                            for (var date = startDate; date <= endDate; date = date.AddDays(1))
                            {
                                var isFree = date.DayOfWeek == DayOfWeek.Saturday || date.DayOfWeek == DayOfWeek.Sunday;
                                var memo = date.DayOfWeek == DayOfWeek.Saturday ? "토요일" :
                                          date.DayOfWeek == DayOfWeek.Sunday ? "일요일" : "";

                                var sql = @"INSERT INTO HolidayList (pdate, free, memo, wuid, wdate)
                                           VALUES (@pdate, @free, @memo, @wuid, GETDATE())";

                                using (var cmd = new SqlCommand(sql, cn, tran))
                                {
                                    cmd.Parameters.AddWithValue("@pdate", date.ToString("yyyy-MM-dd"));
                                    cmd.Parameters.AddWithValue("@free", isFree);
                                    cmd.Parameters.AddWithValue("@memo", memo);
                                    cmd.Parameters.AddWithValue("@wuid", info.Login.no);
                                    cmd.ExecuteNonQuery();
                                }
                            }
                            tran.Commit();
                            return JsonConvert.SerializeObject(new { Success = true, Message = "초기 데이터가 생성되었습니다.", Created = true });
                        }
                        catch
                        {
                            tran.Rollback();
                            throw;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                return JsonConvert.SerializeObject(new { Success = false, Message = ex.Message });
            }
        }

        #endregion
    }

    public class HolidayItem
    {
        public int idx { get; set; }
        public string pdate { get; set; }
        public bool free { get; set; }
        public string memo { get; set; }
    }
}