using System.Threading.Tasks;
using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Authorization;
using Microsoft.Extensions.Logging;
using AyaNova.Models;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Biz;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using System.Collections.Generic;
using AyaNova.Util;

namespace AyaNova.Api.Controllers
{
    [ApiController]
    [ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/schedule")]
    [Produces("application/json")]
    [Authorize]
    public class ScheduleController : ControllerBase
    {
        private readonly AyContext ct;
        private readonly ILogger<ScheduleController> log;
        private readonly ApiServerState serverState;

        /// <summary>
        /// ctor
        /// </summary>
        /// <param name="dbcontext"></param>
        /// <param name="logger"></param>
        /// <param name="apiServerState"></param>  
        public ScheduleController(AyContext dbcontext, ILogger<ScheduleController> logger, ApiServerState apiServerState)
        {
            ct = dbcontext;
            log = logger;
            serverState = apiServerState;
        }

        /// <summary>
        /// Get personal schedule for parameters specified
        /// time zone UTC offset in minutes is required to be passed in 
        /// timestamps returned are in Unix Epoch milliseconds converted for local time display
        /// </summary>
        /// <param name="p">Personal schedule parameters</param>
        /// <param name="apiVersion">From route path</param>
        /// <returns></returns>
        [HttpPost("personal")]
        public async Task<IActionResult> PostPersonalSchedule([FromBody] PersonalScheduleParams p, ApiVersion apiVersion)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));

            List<PersonalScheduleListItem> r = new List<PersonalScheduleListItem>();

            var UserId = UserIdFromContext.Id(HttpContext.Items);
            var UType = UserTypeFromContext.Type(HttpContext.Items);


            //Note: query will return records that fall within viewed range even if they start or end outside of it
            //However in month view (only, rest are as is) we can see up to 6 days before or after the month so in the interest of filling those voids:
            //Adjust query dates to encompass actual potential view range
            DateTime ViewStart = p.Start;
            DateTime ViewEnd = p.End;
            //this covers the largest possible window that could display due to nearly a week of the last or next month showing
            if (p.View == ScheduleView.Month)
            {
                ViewStart = p.Start.AddDays(-6);
                ViewEnd = p.End.AddDays(6);
            }

            //WORKORDERS
            if (p.WorkOrders && (UType == UserType.Service || UType == UserType.ServiceContractor))
            {
                //Note: query for *overlapping* ranges, not *contained* entirely in view range
                r.AddRange(await ct.ViewSchedulePersonalWorkOrder.Where(x => x.SchedUserId == UserId && ViewStart <= x.StopDate && x.StartDate <= ViewEnd)
                    .Select(x => MakeWOSchedItem(x, p))
                    .ToListAsync());
            }
            return Ok(ApiOkResponse.Response(r));
        }

        private static PersonalScheduleListItem MakeWOSchedItem(ViewSchedulePersonalWorkOrder v, PersonalScheduleParams p)
        {
            var s = new PersonalScheduleListItem();
            s.Id = v.WoItemSchedUserId;
            s.Color = ColorFromWOItem(v, p);
            s.TextColor = TextColor(s.Color);
            s.Start = (DateTime)v.StartDate;
            s.End = (DateTime)v.StopDate;
            s.Type = AyaType.WorkOrderItemScheduledUser;
            s.Name = NameFromWOItem(v, p);
            return s;
        }

        // private static long? EpochSeconds(DateTime? dt, int tzOffset = 0)
        // {
        //     if (dt == null) return null;
        //     DateTimeOffset dto = new DateTimeOffset((DateTime)dt);
        //     return dto.ToUnixTimeMilliseconds() + (tzOffset * 60000);
        // }

        private static string ColorFromWOItem(ViewSchedulePersonalWorkOrder v, PersonalScheduleParams p)
        {
            switch (p.ColorSource)
            {
                case PersonalScheduleWorkOrderColorSource.WorkOrderStatus:
                    return v.WorkOrderStatusColor;
                case PersonalScheduleWorkOrderColorSource.WorkOrderItemStatus:
                    return v.WorkOrderItemStatusColor;
                case PersonalScheduleWorkOrderColorSource.WorkOrderItemPriority:
                    return v.WorkOrderItemPriorityColor;
            }
            return string.Empty;
        }

        private static string TextColor(string hexcolor)
        {
            if (string.IsNullOrWhiteSpace(hexcolor)) return "black";
            hexcolor = hexcolor.Replace("#", "");
            var r = StringUtil.HexToInt(hexcolor.Substring(0, 2));
            var g = StringUtil.HexToInt(hexcolor.Substring(2, 2));
            var b = StringUtil.HexToInt(hexcolor.Substring(4, 2));
            var yiq = (r * 299 + g * 587 + b * 114) / 1000;
            return yiq >= 128 ? "black" : "white";
        }

        private static string NameFromWOItem(ViewSchedulePersonalWorkOrder v, PersonalScheduleParams p)
        {
            // Name=[wonumber customername]
            return v.Serial.ToString() + " " + v.CustomerName;
        }


        public enum PersonalScheduleWorkOrderColorSource : int
        {
            None = 0,
            WorkOrderStatus = 2,
            WorkOrderItemStatus = 3,
            WorkOrderItemPriority = 4
        }

        public enum ScheduleView : int
        {
            Day = 1,
            Week = 2,
            Month = 3,
            Day4 = 4
        }

        public class PersonalScheduleParams
        {
            public ScheduleView View { get; set; }
            public DateTime Start { get; set; }
            public DateTime End { get; set; }
            public PersonalScheduleWorkOrderColorSource ColorSource { get; set; }
            public bool WorkOrders { get; set; }
            public bool Reviews { get; set; }
            public bool Reminders { get; set; }
        }

        public class PersonalScheduleListItem
        {
            //Never be null dates in here even though source records might be have null dates because they are not queried for and 
            //can't be displayed on a calendar anyway
            //user can simply filter a data table by null dates to see them 
            //we shouldn't have allowed null dates in the first place in v7 but here we are :)
            public DateTime Start { get; set; }
            public DateTime End { get; set; }
            public bool Timed { get { return true; } }
            public string Name { get; set; }
            public string Color { get; set; }
            public string TextColor { get; set; }
            public AyaType Type { get; set; }
            public long Id { get; set; }

        }
        //------------


    }//eoc
}//eons