using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using SolarPower.Models;
using SolarPower.Repository.Interface;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace SolarPower.Services.Implement
{
    public class OperationScheduleBackgroundService : IHostedService, IDisposable
    {
        static Timer _timer;
        private int time_interval = 30; //查詢間隔(秒)
        private readonly ILogger<OperationScheduleBackgroundService> _log;
        private int execCount = 0;
        private readonly IOperationRepository operationRepository;

        public OperationScheduleBackgroundService(ILogger<OperationScheduleBackgroundService> log,
                                        IOperationRepository operationRepository
                                        )
        {
            this.operationRepository = operationRepository;
            this._log = log;
        }

        public void Dispose()
        {
            _timer?.Dispose();
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _timer = new Timer(DoWork, null,
                TimeSpan.Zero,
                TimeSpan.FromSeconds(time_interval));

            return Task.CompletedTask;
        }

        public async void DoWork(object state)
        {
            //利用 Interlocked 計數防止重複執行
            if (execCount <= 0)
            {
                Interlocked.Increment(ref execCount);
            }

            if (execCount == 1)
            {
                try
                {
                    var getTime = await operationRepository.GetOperationSchedules();
                    foreach (OperationCreatePlanModal a in getTime)
                    {
                        DateTime Updatedtime;
                        if (a.ScheduleType == 0)//日
                        {
                            Updatedtime = Convert.ToDateTime(a.StartTime).AddDays(a.ScheduleNum);
                        }
                        else if (a.ScheduleType == 1)//周
                        {
                            Updatedtime = Convert.ToDateTime(a.StartTime).AddDays(a.ScheduleNum * 7);
                        }
                        else if (a.ScheduleType == 2)//月
                        {
                            Updatedtime = Convert.ToDateTime(a.StartTime).AddMonths(a.ScheduleNum);
                        }
                        else if (a.ScheduleType == 3)//季
                        {
                            Updatedtime = Convert.ToDateTime(a.StartTime).AddMonths(a.ScheduleNum * 3);
                        }
                        else // 年
                        {
                            Updatedtime = Convert.ToDateTime(a.StartTime).AddYears(a.ScheduleNum);
                        }

                        if (Updatedtime < DateTime.Now)
                        {
                            var now = DateTime.Now.ToString("yyyy-MM-dd");
                            var finalid = await operationRepository.GetCurrentSerialNumber("operation_plan_create", $"PowerStationId = {a.PowerStationId} AND CreatedAt LIKE '%{now}%'");
                            var newSerialNumber = GetLastSerialNumber(finalid);
                            var OperationPlan = new OperationCreatePlan()
                            {
                                EmailType = a.EmailType,
                                ScheduleNum = a.ScheduleNum,
                                Description = a.Description,
                                WorkDay = a.WorkDay,
                                ScheduleType = a.ScheduleType,
                                SerialNumber = newSerialNumber,
                                StartTime = Updatedtime.ToString("yyyy-MM-dd hh:mm:ss"),
                                PowerStationId = a.PowerStationId,
                                Type = a.Type,
                                PlanId = DateTime.Now.ToString("yyyyMMdd") + newSerialNumber,
                                CreatedBy = a.CreatedBy
                            };
                            List<string> properties = new List<string>()
                        {
                            "EmailType",
                            "ScheduleNum",
                            "Description",
                            "WorkDay",
                            "ScheduleType",
                            "SerialNumber",
                            "StartTime",
                            "PowerStationId",
                            "Type",
                            "PlanId",
                            "CreatedBy"
                        };
                            await operationRepository.AddOperationPlan(OperationPlan, properties);

                            var record = new PlanToRecord()
                            {
                                WorkType = a.Type,
                                PowerStationId = a.PowerStationId,
                                StartTime = Updatedtime.ToString("yyyy-MM-dd hh:mm:ss"),
                                CreatedBy = a.CreatedBy,
                                EndTime = Updatedtime.AddDays(a.WorkDay).ToString("yyyy-MM-dd hh:mm:ss")
                            };
                            List<string> properties2 = new List<string>()
                        {
                            "WorkType",
                            "PowerStationId",
                            "StartTime",
                            "CreatedBy",
                            "EndTime"
                        };
                            await operationRepository.AddToRecord(record, properties2);
                            var operation = await operationRepository.GetOneOperation(a.Id);
                            await operationRepository.DeleteOneByIdWithCustomTable(a.Id, "operation_plan_create");

                        }

                    }
                }
                catch (Exception ex)
                {
                    _log.LogError("【OperationScheduleService】 - " + ex.Message);
                }
                finally
                {
                    Interlocked.Decrement(ref execCount);
                }
            }
        }

        public string GetLastSerialNumber(string current = "", int pad = 4, byte direction = 0)
        {
            var tempSerialNumber = 0;
            if (!string.IsNullOrEmpty(current))
            {
                tempSerialNumber = Convert.ToInt32(current) + 1;
            }
            else
            {
                tempSerialNumber = 1;
            }

            if (direction == 0)
            {
                return tempSerialNumber.ToString().Trim().PadLeft(pad, '0');
            }
            else
            {
                return tempSerialNumber.ToString().Trim().PadRight(pad, '0');
            }
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            //調整Timer為永不觸發，停用定期排程
            _timer?.Change(Timeout.Infinite, 0);
            return Task.CompletedTask;
        }
    }
}