using Data.SeaHavenIndustries;
using FluentValidation;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Interfaces;
using SeaHaven.Services.Validation;

namespace SeaHaven.Services.Implementation
{
    /// <summary>
    /// Location service implementation
    /// Contains business logic, validation, and orchestration for Location operations
    /// </summary>
    public class LocationService : ILocationService
    {
        private readonly ILocationDataService _locationDataService;
        private readonly ICreateLocationValidation _createValidator;
        private readonly IUpdateLocationValidation _updateValidator;

        public LocationService(
            ILocationDataService locationDataService,
            ICreateLocationValidation createValidator,
            IUpdateLocationValidation updateValidator)
        {
            _locationDataService = locationDataService;
            _createValidator = createValidator;
            _updateValidator = updateValidator;
        }

        // Query operations
        public async Task<LocationDTO?> GetLocationByIdAsync(int id)
        {
            var location = await _locationDataService.GetByIdAsync(id);
            return location == null ? null : MapToDTO(location);
        }

        public async Task<LocationDTO?> GetLocationByIdWithDetailsAsync(int id)
        {
            var location = await _locationDataService.GetByIdWithDetailsAsync(id);
            return location == null ? null : MapToDTO(location);
        }

        public async Task<IEnumerable<LocationDTO>> GetAllLocationsAsync()
        {
            var locations = await _locationDataService.GetAllAsync();
            return locations.Select(MapToDTO);
        }

        public async Task<IEnumerable<LocationDTO>> GetLocationsByAccountIdAsync(int accountId)
        {
            var locations = await _locationDataService.GetByAccountIdAsync(accountId);
            return locations.Select(MapToDTO);
        }

        public async Task<PagedResult<LocationDTO>> GetLocationsPagedAsync(int page, int pageSize, string? search = null)
        {
            var (items, totalCount) = await _locationDataService.GetPagedAsync(page, pageSize, search);
            return new PagedResult<LocationDTO>
            {
                Items = items.Select(MapToDTO).ToList(),
                TotalCount = totalCount,
                Page = page,
                PageSize = pageSize
            };
        }

        public async Task<IReadOnlyList<SiteOptionDTO>> GetSiteOptionsAsync(string? search = null)
        {
            var rows = await _locationDataService.GetSiteOptionsAsync(search);
            return rows
                .Select(r => new SiteOptionDTO
                {
                    Id = r.Id,
                    Code = r.Code,
                    City = r.City,
                    State = r.State
                })
                .ToList();
        }

        public async Task<LocationDTO> CreateLocationAsync(CreateLocationDTO dto, string userId)
        {
            var validationResult = await _createValidator.ValidateAsync(dto);
            if (!validationResult.IsValid)
            {
                throw new ValidationException(validationResult.Errors);
            }

            var location = new Locations
            {
                Name = dto.LocationName,
                Title = dto.LocationName,
                Address1 = dto.Address,
                City = dto.City,
                State = dto.State,
                Zip = dto.Zipcode,
                CreatedDate = DateTime.UtcNow,
                createdby = userId
            };

            var created = await _locationDataService.AddAsync(location);
            return MapToDTO(created);
        }

        public async Task<LocationDTO> UpdateLocationAsync(int id, UpdateLocationDTO dto, string userId)
        {
            var validationResult = await _updateValidator.ValidateAsync(dto);
            if (!validationResult.IsValid)
            {
                throw new ValidationException(validationResult.Errors);
            }

            var location = await _locationDataService.GetByIdAsync(id);
            if (location == null)
                throw new InvalidOperationException($"Location with ID {id} not found");

            // Update properties
            if (dto.LocationName != null) location.Name = dto.LocationName;
            if (dto.LocationName != null) location.Title = dto.LocationName;
            if (dto.Address != null) location.Address1 = dto.Address;
            if (dto.City != null) location.City = dto.City;
            if (dto.State != null) location.State = dto.State;
            if (dto.Zipcode != null) location.Zip = dto.Zipcode;

            location.LastModificationTime = DateTime.UtcNow;
            if (int.TryParse(userId, out int userIdInt))
                location.LastModifierUserId = userIdInt;

            await _locationDataService.UpdateAsync(location);
            return MapToDTO(location);
        }

        public async Task DeleteLocationAsync(int id, string userId)
        {
            var location = await _locationDataService.GetByIdAsync(id);
            if (location == null)
                throw new InvalidOperationException($"Location with ID {id} not found");

            location.IsDeleted = true;
            location.DeleterUserId = userId;
            location.DeletionTime = DateTime.UtcNow;

            await _locationDataService.UpdateAsync(location);
        }

        public async Task<bool> LocationExistsAsync(int id)
        {
            return await _locationDataService.ExistsAsync(id);
        }

        public async Task<int> GetTotalLocationCountAsync()
        {
            return await _locationDataService.CountAsync();
        }

        public async Task<PagedResult<LocationDTO>> GetLocationListPagedAsync(
            int page,
            int pageSize,
            string? search,
            CancellationToken cancellationToken)
        {
            var (items, totalCount) = await _locationDataService.GetListPagedAsync(page, pageSize, search, cancellationToken);
            return new PagedResult<LocationDTO>
            {
                Items = items.Select(MapToDTO).ToList(),
                TotalCount = totalCount,
                Page = page,
                PageSize = pageSize
            };
        }

        public async Task<LocationDTO?> GetLocationDetailAsync(int id, CancellationToken cancellationToken)
        {
            var location = await _locationDataService.GetDetailByIdAsync(id, cancellationToken);
            return location == null ? null : MapToDTO(location);
        }

        public async Task CreateLocationFromRequestAsync(LocationCreateRequestDTO request, CancellationToken cancellationToken)
        {
            var location = new Locations
            {
                Name = request.Name,
                Title = request.Title,
                Address1 = request.Address,
                City = request.City,
                State = request.State,
                Zip = request.ZipCode,
                PhoneNumber = request.Phone,
                Email = request.ContactEmail,
                Status = request.Status
            };

            await _locationDataService.AddAsync(location, cancellationToken);
        }

        public async Task UpdateLocationFromRequestAsync(int id, LocationUpdateRequestDTO request, CancellationToken cancellationToken)
        {
            var location = await _locationDataService.GetByIdForUpdateAsync(id, cancellationToken);
            if (location == null)
                throw new KeyNotFoundException($"Location with ID {id} not found");

            location.Name = request.Name;
            location.Title = request.Title;
            location.Address1 = request.Address;
            location.City = request.City;
            location.State = request.State;
            location.Zip = request.ZipCode;
            location.PhoneNumber = request.Phone;
            location.Email = request.ContactEmail;
            location.Status = request.Status;

            await _locationDataService.UpdateAsync(location, cancellationToken);
        }

        public Task<bool> DeleteLocationByIdAsync(int id, CancellationToken cancellationToken)
        {
            return _locationDataService.DeleteByIdAsync(id, cancellationToken);
        }

        // Private helper methods
        private LocationDTO MapToDTO(Locations location)
        {
            return new LocationDTO
            {
                Id = location.Id,
                Name = location.Name,
                Title = location.Title,
                Address1 = location.Address1,
                Address2 = location.Address2,
                City = location.City,
                State = location.State,
                Zip = location.Zip,
                PhoneNumber = location.PhoneNumber,
                Email = location.Email,
                Status = location.Status,
                CreatedDate = location.CreatedDate,
                CreatedBy = location.createdby
            };
        }
    }
}