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;
using System.ComponentModel.DataAnnotations;

namespace AyaNova.Api.Controllers
{
    [ApiController]
    [ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/schedule")]
    [Produces("application/json")]
    [Authorize]
    public class ScheduleController : ControllerBase
    {
        private const string WHITE_HEXA = "#FFFFFFFF";
        private const string BLACK_HEXA = "#000000FF";
        private const string GRAY_NEUTRAL_HEXA = "#CACACAFF";
        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 service management 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">Service schedule parameters</param>
        /// <param name="apiVersion">From route path</param>
        /// <returns></returns>
        [HttpPost("svc")]
        public async Task<IActionResult> PostServiceSchedule([FromBody] ServiceScheduleParams 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<ServiceScheduleListItem> r = new List<ServiceScheduleListItem>();

            //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);
            }


            //Tags to Users
            List<NameIdItem> Users = null;

            if (p.Tags.Count == 0)
                Users = await ct.User.AsNoTracking()
                    .Where(x => x.Active == true && (x.UserType == UserType.ServiceContractor || x.UserType == UserType.Service))
                    .OrderBy(x => x.Name)
                    .Select(x => new NameIdItem { Name = x.Name, Id = x.Id })
                    .ToListAsync();
            else
            {
                Users = new List<NameIdItem>();
                //add users that match any of the tags, to match they must have at least one of the tags
                //iterate available users
                var availableUsers = await ct.User.AsNoTracking().Where(x => x.Active == true && (x.UserType == UserType.ServiceContractor || x.UserType == UserType.Service)).OrderBy(x => x.Name).Select(x => new { x.Name, x.Id, x.Tags }).ToListAsync();
                //if user has any of the tags in the list then include them
                foreach (var u in availableUsers)
                {
                    //any of the inclusive tags in contact tags?
                    if (p.Tags.Intersect(u.Tags).Any())
                        Users.Add(new NameIdItem { Name = u.Name, Id = u.Id });
                }
            }
            List<long?> userIdList = Users.Select(x => x.Id as long?).ToList();
            userIdList.Add(null);
            //WORKORDERS          
            {
                //Note: query for *overlapping* ranges, not *contained* entirely in view range
                r.AddRange(await ct.ViewScheduleWorkOrder.Where(x => userIdList.Contains(x.SchedUserId) && ViewStart <= x.StopDate && x.StartDate <= ViewEnd)
                    .Select(x => MakeServiceWOSchedItem(x, p))
                    .ToListAsync());
            }
            var HasUnAssigned = r.Any(x => x.UserId == 0);
            return Ok(ApiOkResponse.Response(new { items = r, users = Users, hasUnassigned = HasUnAssigned }));
        }

        public class ServiceScheduleParams
        {
            [Required]
            public ScheduleView View { get; set; }
            [Required]
            public DateTime Start { get; set; }
            [Required]
            public DateTime End { get; set; }
            [Required]
            public ScheduleWorkOrderColorSource WisuColorSource { get; set; }
            // [Required]
            // public List<long> Users { get; set; }//user id's to display and in order to display
            [Required]
            public List<string> Tags { get; set; }
            [Required]
            public bool Dark { get; set; }//indicate if Client is set to dark mode or not, used for colorless types to display as black or white
        }


        //###############################################################
        //USER - svc-schedule-user
        //###############################################################

        /// <summary>
        /// Get User 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">User schedule parameters</param>
        /// <param name="apiVersion">From route path</param>
        /// <returns></returns>
        [HttpPost("user")]
        public async Task<IActionResult> PostUserSchedule([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>();



            //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);
            }

            long? actualUserId = p.UserId == 0 ? null : p.UserId;

            //WORKORDERS           
            {
                //Note: query for *overlapping* ranges, not *contained* entirely in view range
                r.AddRange(await ct.ViewScheduleWorkOrder.Where(x => x.SchedUserId == actualUserId && ViewStart <= x.StopDate && x.StartDate <= ViewEnd)
                    .Select(x => MakePersonalWOSchedItem(x, p))
                    .ToListAsync());
            }


            return Ok(ApiOkResponse.Response(r));
        }


        //###############################################################
        //PERSONAL
        //###############################################################

        /// <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.Wisu && (UType == UserType.Service || UType == UserType.ServiceContractor))
            {
                //Note: query for *overlapping* ranges, not *contained* entirely in view range
                r.AddRange(await ct.ViewScheduleWorkOrder.Where(x => x.SchedUserId == UserId && ViewStart <= x.StopDate && x.StartDate <= ViewEnd)
                    .Select(x => MakePersonalWOSchedItem(x, p))
                    .ToListAsync());
            }

            //REMINDERS
            if (p.Reminders)
            {
                r.AddRange(await ct.Reminder.Where(x => x.UserId == UserId && ViewStart <= x.StopDate && x.StartDate <= ViewEnd).Select(x => MakeReminderSchedItem(x, p)).ToListAsync());
            }

            //REVIEWS
            if (p.Reviews)
            {
                r.AddRange(await ct.Review.Where(x => x.UserId == UserId && ViewStart <= x.ReviewDate && x.ReviewDate <= ViewEnd).Select(x => MakeReviewSchedItem(x, p)).ToListAsync());
            }
            return Ok(ApiOkResponse.Response(r));
        }

        /// <summary>
        /// Adjust a schedule item's start / end timestamp
        /// </summary>
        /// <param name="ad">Adjustment parameters parameters</param>
        /// <param name="apiVersion">From route path</param>
        /// <returns>Error or OK response</returns>
        [HttpPost("adjust")]
        public async Task<IActionResult> AdjustSchedule([FromBody] ScheduleItemAdjustParams ad, ApiVersion apiVersion)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));

            switch (ad.Type)
            {
                case AyaType.WorkOrderItemScheduledUser:
                    {
                        WorkOrderBiz biz = WorkOrderBiz.GetBiz(ct, HttpContext);
                        if (!Authorized.HasModifyRole(HttpContext.Items, AyaType.WorkOrderItemScheduledUser) || biz.UserIsRestrictedType)
                            return StatusCode(403, new ApiNotAuthorizedResponse());
                        //svc-schedule-user uses 0 to mean unassigned user but here it's null 
                        //and it can't be a required parameter and provide null for some reason so zero is the token indicator
                        if (ad.UserId == 0)
                            ad.UserId = null;
                        var o = await biz.ScheduledUserPutNewScheduleTimeAsync(ad);
                        if (o == false)
                        {
                            if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                                return StatusCode(409, new ApiErrorResponse(biz.Errors));
                            else
                                return BadRequest(new ApiErrorResponse(biz.Errors));
                        }
                    }
                    break;
                case AyaType.Reminder:
                    {
                        ReminderBiz biz = ReminderBiz.GetBiz(ct, HttpContext);
                        var o = await biz.PutNewScheduleTimeAsync(ad);
                        if (o == false)
                        {
                            if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                                return StatusCode(409, new ApiErrorResponse(biz.Errors));
                            else
                                return BadRequest(new ApiErrorResponse(biz.Errors));
                        }
                    }
                    break;
                case AyaType.Review:
                    {
                        ReviewBiz biz = ReviewBiz.GetBiz(ct, HttpContext);
                        var o = await biz.PutNewScheduleTimeAsync(ad);
                        if (o == false)
                        {
                            if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                                return StatusCode(409, new ApiErrorResponse(biz.Errors));
                            else
                                return BadRequest(new ApiErrorResponse(biz.Errors));
                        }
                    }
                    break;
                default:
                    return BadRequest(new ApiErrorResponse(ApiErrorCode.VALIDATION_INVALID_VALUE, "Type", "Type not supported for adjustment"));
            }

            //a-ok response
            return Ok(ApiOkResponse.Response(true));
        }



        //#### UTILITY METHODS ##############

        private static ServiceScheduleListItem MakeServiceWOSchedItem(ViewScheduleWorkOrder v, ServiceScheduleParams p)
        {
            var s = new ServiceScheduleListItem();
            s.Id = v.WoItemSchedUserId;
            s.Color = ColorFromWOItem(v, p.WisuColorSource);
            s.TextColor = TextColor(s.Color);
            s.Start = (DateTime)v.StartDate;
            s.End = (DateTime)v.StopDate;
            s.Type = AyaType.WorkOrderItemScheduledUser;
            s.Name = NameFromWOItem(v);
            s.Editable = v.WorkOrderStatusCompleted != true && v.WorkOrderStatusLocked != true;//could be null as well which we'll consider open as it's no status set
            s.UserId = v.SchedUserId ?? 0;//0 signifies to client schedule that it's an unassigned woitem
            return s;
        }

        private static PersonalScheduleListItem MakePersonalWOSchedItem(ViewScheduleWorkOrder v, PersonalScheduleParams p)
        {
            var s = new PersonalScheduleListItem();
            s.Id = v.WoItemSchedUserId;
            s.Color = ColorFromWOItem(v, p.WisuColorSource);
            s.TextColor = TextColor(s.Color);
            s.Start = (DateTime)v.StartDate;
            s.End = (DateTime)v.StopDate;
            s.Type = AyaType.WorkOrderItemScheduledUser;
            s.Name = NameFromWOItem(v);
            s.Editable = v.WorkOrderStatusCompleted != true && v.WorkOrderStatusLocked != true;//could be null as well which we'll consider open as it's no status set
            return s;
        }

        private static PersonalScheduleListItem MakeReminderSchedItem(Reminder v, PersonalScheduleParams p)
        {
            var s = new PersonalScheduleListItem();
            s.Id = v.Id;
            s.Color = v.Color;
            s.TextColor = TextColor(v.Color);
            s.Start = (DateTime)v.StartDate;
            s.End = (DateTime)v.StopDate;
            s.Type = AyaType.Reminder;
            s.Name = v.Name;
            s.Editable = true;//personal reminders are always editable
            return s;
        }

        private static PersonalScheduleListItem MakeReviewSchedItem(Review v, PersonalScheduleParams p)
        {
            var s = new PersonalScheduleListItem();
            s.Id = v.Id;
            s.Color = p.Dark ? WHITE_HEXA : BLACK_HEXA;
            s.TextColor = p.Dark ? "black" : "white";
            s.Start = (DateTime)v.ReviewDate;
            s.End = (DateTime)v.ReviewDate.AddMinutes(30);//just something to show in schedule as not supporting all day or unscheduled type stuff
            s.Type = AyaType.Review;
            s.Name = v.Name;
            s.Editable = v.CompletedDate == null;//not completed yet so can still be changed
            return s;
        }



        private static string ColorFromWOItem(ViewScheduleWorkOrder v, ScheduleWorkOrderColorSource src)
        {

            switch (src)
            {
                case ScheduleWorkOrderColorSource.None:
                    return GRAY_NEUTRAL_HEXA;
                case ScheduleWorkOrderColorSource.WorkOrderStatus:
                    return string.IsNullOrWhiteSpace(v.WorkOrderStatusColor) ? GRAY_NEUTRAL_HEXA : v.WorkOrderStatusColor;
                case ScheduleWorkOrderColorSource.WorkOrderItemStatus:
                    return string.IsNullOrWhiteSpace(v.WorkOrderItemStatusColor) ? GRAY_NEUTRAL_HEXA : v.WorkOrderItemStatusColor;
                case ScheduleWorkOrderColorSource.WorkOrderItemPriority:
                    return string.IsNullOrWhiteSpace(v.WorkOrderItemPriorityColor) ? GRAY_NEUTRAL_HEXA : v.WorkOrderItemPriorityColor;

            }
            return GRAY_NEUTRAL_HEXA;
        }

        private static string TextColor(string hexcolor)
        {
            //Note: we use HEXA format which is 8 hex digits 
            //this here works even though it's considering as 6 digits because in hexA the last two 
            //digits are the opacity which this can ignore
            if (string.IsNullOrWhiteSpace(hexcolor) || hexcolor.Length < 6) return GRAY_NEUTRAL_HEXA;//gray neutral
            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 ? WHITE_HEXA : BLACK_HEXA;
            return yiq >= 128 ? "black" : "white";//<---NOTE: this MUST be a named color due to how the style is applied at client
        }

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


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

        public enum ScheduleView : int
        {
            Day = 1,
            Week = 2,
            Month = 3,
            Day4 = 4,
            Category = 5
        }

        public class PersonalScheduleParams
        {
            [Required]
            public ScheduleView View { get; set; }
            [Required]
            public DateTime Start { get; set; }
            [Required]
            public DateTime End { get; set; }
            [Required]
            public ScheduleWorkOrderColorSource WisuColorSource { get; set; }
            [Required]
            public bool Wisu { get; set; }
            [Required]
            public bool Reviews { get; set; }
            [Required]
            public bool Reminders { get; set; }
            [Required]
            public bool Dark { get; set; }//indicate if Client is set to dark mode or not, used for colorless types to display as black or white
            [Required]
            public long UserId { get; set; }//required due to dual use from home-schedule and svc-schedule-user if it's a 0 zero then it's actually meant to be null not assigned userid
        }

        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 string Name { get; set; }
            public string Color { get; set; }
            public string TextColor { get; set; }
            public AyaType Type { get; set; }
            public long Id { get; set; }
            public bool Editable { get; set; }
        }

        public class ServiceScheduleListItem
        {
            //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 string Name { get; set; }
            public string Color { get; set; }
            public string TextColor { get; set; }
            public AyaType Type { get; set; }
            public long Id { get; set; }
            public bool Editable { get; set; }
            public long UserId { get; set; }
        }
        //------------


        // deprecated as not used but by tag instead
        // /// <summary>
        // /// Get active Scheduleable user list
        // /// </summary>      
        // /// <returns>List of all scheduleable users</returns>
        // [HttpGet("scheduleable-user-list")]
        // public async Task<IActionResult> GetScheduleableUserList()
        // {
        //     if (!serverState.IsOpen)
        //         return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
        //     if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.WorkOrder))//WorkOrder right applies to all svc-schedule ops
        //         return StatusCode(403, new ApiNotAuthorizedResponse());
        //     var o = await ct.User.AsNoTracking().Where(x => x.Active == true && x.UserType == UserType.ServiceContractor || x.UserType == UserType.Service).OrderBy(x => x.Name).Select(x => new { x.Name, x.Id }).ToListAsync();

        //     return Ok(ApiOkResponse.Response(o));
        // }

    }//eoc
}//eons