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

namespace SeaHaven.DataServices.Implementation
{
    public class LocationDataService : ILocationDataService
    {
        private readonly ApplicationDbContext _context;

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

        public async Task<Locations?> GetByIdAsync(int id)
        {
            return await _context.Locations.FindAsync(id);
        }

        public async Task<Locations?> GetByIdWithDetailsAsync(int id)
        {
            return await _context.Locations
                .FirstOrDefaultAsync(l => l.Id == id);
        }

        public async Task<IEnumerable<Locations>> GetAllAsync()
        {
            return await _context.Locations.ToListAsync();
        }

        public async Task<IEnumerable<Locations>> GetByAccountIdAsync(int accountId)
        {
            return await _context.Locations
                .AsNoTracking()
                .Where(l => l.AccountId == accountId)
                .ToListAsync();
        }

        public async Task<(bool Exists, int? AccountId)> GetAccountScopeAsync(
            int locationId,
            CancellationToken cancellationToken = default)
        {
            var row = await _context.Locations
                .AsNoTracking()
                .Where(l => l.Id == locationId)
                .Select(l => new { l.AccountId })
                .FirstOrDefaultAsync(cancellationToken);

            return row == null ? (false, null) : (true, row.AccountId);
        }

        public async Task<(IEnumerable<Locations> Items, int TotalCount)> GetPagedAsync(
            int page,
            int pageSize,
            string? search = null)
        {
            var query = _context.Locations.AsQueryable();

            if (!string.IsNullOrWhiteSpace(search))
            {
                query = query.Where(l =>
                    l.Name!.Contains(search) ||
                    l.City!.Contains(search));
            }

            var totalCount = await query.CountAsync();
            var items = await query
                .OrderBy(l => l.Name)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync();

            return (items, totalCount);
        }

        public async Task<IReadOnlyList<SiteOptionRow>> GetSiteOptionsAsync(
            string? search = null,
            CancellationToken cancellationToken = default)
        {
            var query = _context.Locations
                .AsNoTracking()
                .Where(l => l.AccountId != null);

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.ToLower();
                query = query.Where(l =>
                    (l.Name ?? "").ToLower().Contains(s) ||
                    (l.City ?? "").ToLower().Contains(s));
            }

            return await query
                .OrderBy(l => l.Name)
                .Select(l => new SiteOptionRow(l.Id, l.Name, l.City, l.State))
                .ToListAsync(cancellationToken);
        }

        public async Task<Locations> AddAsync(Locations location)
        {
            location.CreatedDate = DateTime.Now;
            await _context.Locations.AddAsync(location);
            await _context.SaveChangesAsync();
            return location;
        }

        public async Task UpdateAsync(Locations location)
        {
            location.LastModificationTime = DateTime.Now;
            _context.Locations.Update(location);
            await _context.SaveChangesAsync();
        }

        public async Task DeleteAsync(int id)
        {
            var entity = await GetByIdAsync(id);
            if (entity != null)
            {
                _context.Locations.Remove(entity);
                await _context.SaveChangesAsync();
            }
        }

        public async Task<bool> ExistsAsync(int id)
        {
            return await _context.Locations.AnyAsync(l => l.Id == id);
        }

        public async Task<int> CountAsync()
        {
            return await _context.Locations.CountAsync();
        }

        public async Task<(List<Locations> Items, int TotalCount)> GetListPagedAsync(
            int page,
            int pageSize,
            string? search,
            IReadOnlyCollection<string>? states,
            CancellationToken cancellationToken)
        {
            var query = _context.Locations.AsNoTracking();

            if (!string.IsNullOrWhiteSpace(search))
            {
                query = query.Where(l =>
                    l.Name!.Contains(search) ||
                    l.City!.Contains(search));
            }

            if (states is { Count: > 0 })
            {
                query = query.Where(l => l.State != null && states.Contains(l.State.Trim().ToUpper()));
            }

            var totalCount = await query.CountAsync(cancellationToken);
            var items = await query
                .OrderBy(l => l.Name)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync(cancellationToken);

            return (items, totalCount);
        }

        public async Task<Locations?> GetDetailByIdAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.Locations
                .AsNoTracking()
                .Include(l => l.Contacts.Where(c => c.IsDeleted != true))
                .FirstOrDefaultAsync(l => l.Id == id, cancellationToken);
        }

        public async Task<Locations?> GetByIdForUpdateAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.Locations
                .Include(l => l.Contacts)
                .FirstOrDefaultAsync(l => l.Id == id, cancellationToken);
        }

        public async Task<IReadOnlyList<Contacts>> GetSiteContactsByLocationIdsAsync(
            IReadOnlyCollection<int> locationIds,
            CancellationToken cancellationToken)
        {
            if (locationIds.Count == 0)
                return Array.Empty<Contacts>();

            return await _context.Contacts
                .AsNoTracking()
                .Where(c => c.LocationId != null && locationIds.Contains(c.LocationId.Value) && c.IsDeleted != true)
                .OrderBy(c => c.SiteContactOrder)
                .ThenBy(c => c.Id)
                .ToListAsync(cancellationToken);
        }

        public async Task<Locations> AddAsync(Locations location, CancellationToken cancellationToken)
        {
            location.CreatedDate = DateTime.Now;
            await _context.Locations.AddAsync(location, cancellationToken);
            await _context.SaveChangesAsync(cancellationToken);
            return location;
        }

        public async Task UpdateAsync(Locations location, CancellationToken cancellationToken)
        {
            location.LastModificationTime = DateTime.Now;
            _context.Locations.Update(location);
            await _context.SaveChangesAsync(cancellationToken);
        }

        public async Task<bool> DeleteByIdAsync(int id, CancellationToken cancellationToken)
        {
            var entity = await _context.Locations
                .Include(l => l.Contacts)
                .FirstOrDefaultAsync(l => l.Id == id, cancellationToken);
            if (entity == null)
                return false;

            var now = DateTime.Now;
            foreach (var contact in entity.Contacts ?? Enumerable.Empty<Contacts>())
            {
                if (contact.IsDeleted != true)
                {
                    contact.IsDeleted = true;
                    contact.DeletionTime = now;
                }

                contact.LocationId = null;
            }

            _context.Locations.Remove(entity);
            await _context.SaveChangesAsync(cancellationToken);
            return true;
        }

        public async Task<(IEnumerable<object> Items, int TotalCount)> GetAddressbookPagedAsync(
            int page,
            int pageSize,
            string? search = null)
        {
            search ??= "";

            var query = _context.Locations.AsQueryable();

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.ToLower();
                query = query.Where(w =>
                    (w.Name ?? "").ToLower().Contains(s) ||
                    (w.Title ?? "").ToLower().Contains(s));
            }

            var totalCount = await query.CountAsync();

            var data = await query
                .Select(n => new
                {
                    n.Id,
                    n.Name,
                    n.Title
                })
                .OrderByDescending(d => d.Id)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync();

            return (data, totalCount);
        }
    }
}