using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Helpers;
using SeaHaven.DataServices.Interfaces;

namespace SeaHaven.DataServices.Implementation
{
    public class DashboardDataService : IDashboardDataService
    {
        private readonly ApplicationDbContext _context;

        public DashboardDataService(ApplicationDbContext context)
        {
            _context = context;
        }

        public async Task<DashboardCounts> GetWorkOrderCountsAsync(
            int? accountId,
            CancellationToken cancellationToken)
        {
            var query = _context.workOrders.Where(w => w.istemplate != true);
            if (accountId is int scopedAccountId)
            {
                query = query.Where(w => w.AccountId == scopedAccountId);
            }

            var total = await query.CountAsync(cancellationToken);
            var open = await query.CountAsync(w => w.Status == "Open" || w.Status == "In Progress" || w.Status == "On Hold", cancellationToken);
            var notDispatched = await query.CountAsync(w => (w.Status == "Open") && (w.AssignTo == null || w.AssignTo == ""), cancellationToken);
            var completed = await query.CountAsync(w => w.Status == "Done", cancellationToken);

            return new DashboardCounts
            {
                Total = total,
                Open = open,
                NotDispatched = notDispatched,
                Completed = completed
            };
        }

        public async Task<IReadOnlyList<DashboardWorkOrder>> GetDashboardWorkOrdersAsync(
            int? accountId,
            string? dispatcherId,
            DateOnly? dateFrom,
            DateOnly? dateTo,
            CancellationToken cancellationToken)
        {
            var query = WorkOrderBoardQueryFilters.ApplyBaseScope(_context.workOrders.AsNoTracking());
            if (accountId is int scopedAccountId)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, scopedAccountId);

            if (dispatcherId != null)
                query = query.Where(w => w.AssignTo == dispatcherId);

            if (dateFrom is DateOnly from && dateTo is DateOnly to)
            {
                var fromDate = from.ToDateTime(TimeOnly.MinValue);
                var toDateExclusive = to.AddDays(1).ToDateTime(TimeOnly.MinValue);
                query = query.Where(w =>
                    w.ScheduledDate >= fromDate && w.ScheduledDate < toDateExclusive);
            }

            return await query
                .Select(w => new DashboardWorkOrder(
                    w.Id,
                    w.AssignTo,
                    w.WorkOrderType,
                    w.LifecycleStatus,
                    w.LegacyStatus ?? w.Status,
                    w.ScheduledDate,
                    w.OriginalDate,
                    w.CompletedDate,
                    w.Locations == null ? null : w.Locations.State,
                    w.RescheduleCount,
                    w.PrimaryDispatch == null || w.PrimaryDispatch.Vendor == null
                        ? null
                        : w.PrimaryDispatch.Vendor.CompanyId,
                    w.PrimaryDispatch == null || w.PrimaryDispatch.Vendor == null
                        || w.PrimaryDispatch.Vendor.Company == null
                        ? null
                        : w.PrimaryDispatch.Vendor.Company.Name,
                    w.PrimaryDispatch != null && w.PrimaryDispatch.Vendor != null
                        && w.PrimaryDispatch.Vendor.IsActive,
                    w.PrimaryDispatch != null && w.PrimaryDispatch.Vendor != null
                        && w.PrimaryDispatch.Vendor.Company != null
                        && w.PrimaryDispatch.Vendor.Company.IsDeleted == true))
                .ToListAsync(cancellationToken);
        }

        public async Task<DashboardKpiCounts> GetKpiCountsAsync(
            int? accountId,
            string? dispatcherId,
            DateOnly today,
            CancellationToken cancellationToken)
        {
            var tomorrow = today.AddDays(1);
            var dayAfterTomorrow = tomorrow.AddDays(1);
            var workOrders = WorkOrderBoardQueryFilters.ApplyBaseScope(_context.workOrders.AsNoTracking());
            if (accountId is int scopedAccountId)
                workOrders = WorkOrderBoardQueryFilters.ApplyAccountScope(workOrders, scopedAccountId);
            if (dispatcherId != null)
                workOrders = workOrders.Where(w => w.AssignTo == dispatcherId);

            var scheduledTomorrow = await workOrders
                .Where(w => w.ScheduledDate >= tomorrow.ToDateTime(TimeOnly.MinValue)
                    && w.ScheduledDate < dayAfterTomorrow.ToDateTime(TimeOnly.MinValue))
                .CountAsync(cancellationToken);

            var avetaPending = await workOrders
                .Where(w => w.ScheduledDate >= today.ToDateTime(TimeOnly.MinValue)
                    && w.ScheduledDate < dayAfterTomorrow.ToDateTime(TimeOnly.MinValue)
                    && w.AvetaRequired
                    && w.LifecycleStatus != LifecycleStatus.Completed
                    && w.LifecycleStatus != LifecycleStatus.Canceled
                    && (w.LifecycleStatus != null
                        || ((w.LegacyStatus ?? w.Status) != "Done"
                            && (w.LegacyStatus ?? w.Status) != "Completed"
                            && (w.LegacyStatus ?? w.Status) != "Complete"
                            && (w.LegacyStatus ?? w.Status) != "Closed"
                            && (w.LegacyStatus ?? w.Status) != "Canceled"
                            && (w.LegacyStatus ?? w.Status) != "Cancelled"))
                    && !w.workOrderAttachments!.Any(attachment =>
                        (attachment.IsDeleted == null || attachment.IsDeleted == false)
                        && attachment.Category == WorkOrderMediaCategory.Aveta))
                .CountAsync(cancellationToken);

            var pendingUplifts = _context.DispatchUpliftRequests
                .AsNoTracking()
                .Where(request => request.Status == "Pending"
                    && (request.IsDeleted == null || request.IsDeleted == false)
                    && request.Dispatch != null
                    && (request.Dispatch.IsDeleted == null || request.Dispatch.IsDeleted == false));
            if (accountId is int account)
            {
                pendingUplifts = pendingUplifts.Where(request =>
                    (request.Dispatch!.WorkOrder != null && request.Dispatch.WorkOrder.AccountId == account)
                    || request.Dispatch.DispatchWorkOrders!.Any(link =>
                        link.WorkOrder != null && link.WorkOrder.AccountId == account));
            }
            if (dispatcherId != null)
            {
                pendingUplifts = pendingUplifts.Where(request =>
                    (request.Dispatch!.WorkOrder != null && request.Dispatch.WorkOrder.AssignTo == dispatcherId)
                    || request.Dispatch.DispatchWorkOrders!.Any(link =>
                        link.WorkOrder != null && link.WorkOrder.AssignTo == dispatcherId));
            }

            return new DashboardKpiCounts(
                scheduledTomorrow,
                await pendingUplifts.CountAsync(cancellationToken),
                avetaPending);
        }

        public async Task<IReadOnlyList<DashboardDispatcherWorkload>> GetDispatcherWorkloadAsync(
            int? accountId,
            string? dispatcherId,
            DateOnly? dateFrom,
            DateOnly? dateTo,
            CancellationToken cancellationToken)
        {
            var dispatcherUsers = from user in _context.Users.AsNoTracking()
                                  join userRole in _context.UserRoles
                                      on user.Id equals userRole.UserId
                                  join role in _context.Roles
                                      on userRole.RoleId equals role.Id
                                  where user.IsDeleted != true
                                      && (role.Name == "Dispatcher" || role.Name == "DISPATCHER")
                                  select new
                                  {
                                      user.Id,
                                      Name = ((user.FirstName ?? "") + " " + (user.LastName ?? "")).Trim(),
                                      user.Color
                                  };

            var workOrders = WorkOrderBoardQueryFilters.ApplyBaseScope(_context.workOrders.AsNoTracking());
            if (accountId is int scopedAccountId)
                workOrders = WorkOrderBoardQueryFilters.ApplyAccountScope(workOrders, scopedAccountId);

            if (dispatcherId != null)
                workOrders = workOrders.Where(w => w.AssignTo == dispatcherId);

            if (dateFrom is DateOnly from && dateTo is DateOnly to)
            {
                var fromDate = from.ToDateTime(TimeOnly.MinValue);
                var toDateExclusive = to.AddDays(1).ToDateTime(TimeOnly.MinValue);
                workOrders = workOrders.Where(w =>
                    w.ScheduledDate >= fromDate && w.ScheduledDate < toDateExclusive);
            }

            var counts = await workOrders
                .Where(w => w.AssignTo != null)
                .GroupBy(w => w.AssignTo!)
                .Select(group => new
                {
                    DispatcherId = group.Key,
                    TotalCount = group.Count(),
                    OpenCount = group.Count(w =>
                        w.LifecycleStatus != LifecycleStatus.Completed
                        && w.LifecycleStatus != LifecycleStatus.Canceled
                        && (w.LifecycleStatus != null
                            || (w.LegacyStatus ?? w.Status) != "Done"
                            && (w.LegacyStatus ?? w.Status) != "Completed"
                            && (w.LegacyStatus ?? w.Status) != "Complete"
                            && (w.LegacyStatus ?? w.Status) != "Closed"
                            && (w.LegacyStatus ?? w.Status) != "Canceled"
                            && (w.LegacyStatus ?? w.Status) != "Cancelled"))
                })
                .ToListAsync(cancellationToken);

            var dispatcherList = await dispatcherUsers
                .Distinct()
                .ToListAsync(cancellationToken);

            return dispatcherList
                .GroupJoin(
                    counts,
                    user => user.Id,
                    count => count.DispatcherId,
                    (user, matchingCounts) =>
                    {
                        var count = matchingCounts.SingleOrDefault();
                        return new DashboardDispatcherWorkload(
                                user.Id,
                                user.Name,
                                user.Color,
                                count?.TotalCount ?? 0,
                                count?.OpenCount ?? 0);
                    })
                .ToList();
        }
    }
}