using System.Security.Claims;
using Data.SeaHavenIndustries.Enums;
using SeaHaven.DataServices.Helpers;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Interfaces;

namespace SeaHaven.Services.Implementation
{
    public class WorkOrderBoardService : IWorkOrderBoardService
    {
        private readonly IWorkOrderBoardDataService _boardDataService;
        private readonly IWorkOrderAccountResolver _accountResolver;

        public WorkOrderBoardService(
            IWorkOrderBoardDataService boardDataService,
            IWorkOrderAccountResolver accountResolver)
        {
            _boardDataService = boardDataService;
            _accountResolver = accountResolver;
        }

        public async Task<WorkOrderBoardResponseDto> GetBoardAsync(
            WorkOrderBoardQueryDto query,
            ClaimsPrincipal user,
            string? currentUserId,
            CancellationToken cancellationToken = default)
        {
            var accountId = _accountResolver.ResolveAccountFilter(user);
            var weekStart = query.WeekStart;
            var weekEnd = query.WeekEnd ?? weekStart.AddDays(4);

            var validationError = WorkOrderOperationalWeek.ValidateWeekWindow(weekStart, weekEnd);
            if (validationError != null)
                throw new ArgumentException(validationError);

            var dataQuery = new WorkOrderBoardQuery(
                weekStart,
                weekEnd,
                query.Dispatchers,
                query.MyWorkOrders,
                query.Types,
                query.Overdue,
                query.Search,
                currentUserId,
                accountId);

            var result = await _boardDataService.GetBoardRowsAsync(dataQuery, cancellationToken);
            var utcNow = DateTime.UtcNow;

            return new WorkOrderBoardResponseDto
            {
                WeekStart = weekStart,
                WeekEnd = weekEnd,
                Counts = new WorkOrderBoardCountsDto
                {
                    Total = result.ScheduledTotalBeforeSearch,
                    Returned = result.ScheduledRows.Count
                },
                Scheduled = result.ScheduledRows.Select(r => MapRawRow(r, utcNow)).ToList(),
                Unscheduled = result.UnscheduledRows.Select(r => MapRawRow(r, utcNow)).ToList()
            };
        }

        public async Task<IReadOnlyList<DispatcherLookupDto>> GetDispatcherLookupsAsync()
        {
            var rows = await _boardDataService.GetDispatcherLookupsAsync();
            return rows.Select(r => new DispatcherLookupDto
            {
                Id = r.Id,
                Name = FormatName(r.FirstName, r.LastName),
                Initials = r.Initials,
                Color = r.Color
            }).ToList();
        }

        public async Task<WorkOrderBoardRowDto?> GetBoardRowAsync(int workOrderId, ClaimsPrincipal user)
        {
            var accountId = _accountResolver.ResolveAccountFilter(user);
            var raw = await _boardDataService.GetBoardRowByIdAsync(workOrderId, accountId);
            return raw == null ? null : MapRawRow(raw, DateTime.UtcNow);
        }

        public static WorkOrderBoardRowDto MapRawRow(WorkOrderBoardRawRow row, DateTime utcNow)
        {
            // Appt column: date prefers dispatch appointment (vendor slot), then WO ScheduledDate.
            // Time uses WO ScheduledStart/End only. Do not fall back to a date-only dispatch
            // instant (midnight), or clearing apptTime still renders 00:00.
            var apptStart = row.ScheduledStart
                ?? (HasClockTime(row.DispatchApptDate) ? row.DispatchApptDate : null);
            var apptEnd = row.ScheduledEnd;
            var (vendorId, vendorName) = WorkOrderBoardDispatchAssignment.LiveVendor(
                row.VendorId,
                row.VendorName,
                row.PrimaryDispatchStatus);

            return new WorkOrderBoardRowDto
            {
                Id = row.Id,
                WoNumber = row.InternalWONumber,
                RescheduleCount = row.RescheduleCount,
                CarriedOver = row.CarriedOver,
                IsAddOn = row.IsAddOn,
                AvetaRequired = row.AvetaRequired,
                HasAvetaDocument = row.HasAvetaDocument,
                OriginalDate = row.OriginalDate,
                OriginalWeek = row.OriginalWeek,
                WorkOrderType = row.WorkOrderType,
                IsPastDue = WorkOrderDerivedFields.IsPastDue(row.ScheduledDate, row.LifecycleStatus, utcNow),
                SiteCode = row.SiteCode,
                LocationName = row.LocationName,
                PocName = row.PocName,
                PocPhone = row.PocPhone,
                PocNotes = row.PocNotes,
                LifecycleStatus = row.LifecycleStatus,
                LifecycleStatusLabel = WorkOrderDerivedFields.GetLifecycleStatusLabel(row.LifecycleStatus),
                LegacyStatus = row.LegacyStatus,
                DispatcherId = row.AssignTo,
                DispatcherName = FormatName(row.DispatcherFirstName, row.DispatcherLastName),
                Initials = row.Initials,
                Color = row.Color,
                DueDate = row.DueDate,
                ScheduledDate = row.ScheduledDate,
                TargetWeek = row.TargetWeek,
                ScheduleWeekOnly = row.ScheduleWeekOnly,
                DayGroup = WorkOrderDerivedFields.GetDayGroup(row.ScheduledDate),
                VendorId = vendorId,
                VendorName = vendorName,
                PrimaryDispatchStatus = row.PrimaryDispatchStatus,
                TechName = row.TechName,
                TechPhone = row.TechPhone,
                ApptDate = row.DispatchApptDate ?? row.ScheduledDate,
                ApptTime = WorkOrderDerivedFields.FormatApptTime(apptStart, apptEnd),
                Pm = row.Trade ?? row.Problem,
                ServiceNotes = row.ServiceNotes,
                ExtraServices = ParseExtraServices(row.ExtraServices),
                AdditionalContacts = WorkOrderAdditionalContactsMapper.ParseJson(row.AdditionalContacts),
                DocStatus = row.DocStatus,
                MediaCount = row.MediaCount,
                CompletedDate = row.CompletedDate,
                FlagColor = row.FlagColor,
                Severity = WorkOrderSeverityRules.ParseLevel(row.Severity),
                PrimaryDispatchId = row.PrimaryDispatchId,
                RowVersion = row.RowVersion,
                DispatchRowVersion = row.DispatchRowVersion,
                PendingUpliftCount = row.PendingUpliftCount,
                UpliftSummary = WorkOrderUpliftContractMapper.MapSummary(row)
            };
        }

        private static bool HasClockTime(DateTime? value)
            => value.HasValue && value.Value.TimeOfDay != TimeSpan.Zero;

        private static string FormatName(string? firstName, string? lastName)
            => $"{firstName ?? ""} {lastName ?? ""}".Trim();

        private static List<string>? ParseExtraServices(string? json)
        {
            if (string.IsNullOrWhiteSpace(json))
                return null;

            try
            {
                var list = System.Text.Json.JsonSerializer.Deserialize<List<string>>(json);
                return list is { Count: > 0 } ? list : null;
            }
            catch (System.Text.Json.JsonException)
            {
                return null;
            }
        }
    }
}