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>
    /// Asset service implementation
    /// Contains business logic, validation, and orchestration for Asset operations
    /// </summary>
    public class AssetService : IAssetService
    {
        private readonly IAssetDataService _assetDataService;
        private readonly ICreateAssetValidation _createValidator;
        private readonly IUpdateAssetValidation _updateValidator;

        public AssetService(
            IAssetDataService assetDataService,
            ICreateAssetValidation createValidator,
            IUpdateAssetValidation updateValidator)
        {
            _assetDataService = assetDataService;
            _createValidator = createValidator;
            _updateValidator = updateValidator;
        }

        public async Task<AssetDTO?> GetAssetByIdAsync(int id)
        {
            var asset = await _assetDataService.GetByIdAsync(id);
            return asset == null ? null : MapToDTO(asset);
        }

        public async Task<AssetDTO?> GetAssetByIdWithDetailsAsync(int id)
        {
            var asset = await _assetDataService.GetByIdWithDetailsAsync(id);
            return asset == null ? null : MapToDTO(asset);
        }

        public async Task<IEnumerable<AssetDTO>> GetAllAssetsAsync()
        {
            var assets = await _assetDataService.GetAllAsync();
            return assets.Select(MapToDTO);
        }

        public async Task<IEnumerable<AssetDTO>> GetAssetsByLocationIdAsync(int locationId)
        {
            var assets = await _assetDataService.GetAllAsync();
            return assets.Where(a => a.LocationId == locationId).Select(MapToDTO);
        }

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

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

            var asset = new Assets
            {
                Name = dto.Name,
                LocationId = dto.LocationId,
                CreatedDate = DateTime.UtcNow,
                createdby = userId
            };

            var created = await _assetDataService.AddAsync(asset);
            return MapToDTO(created);
        }

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

            var asset = await _assetDataService.GetByIdAsync(id);
            if (asset == null)
                throw new InvalidOperationException($"Asset with ID {id} not found");

            if (dto.Name != null) asset.Name = dto.Name;
            if (dto.LocationId.HasValue) asset.LocationId = dto.LocationId;

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

            await _assetDataService.UpdateAsync(asset);
            return MapToDTO(asset);
        }

        public async Task DeleteAssetAsync(int id, string userId)
        {
            var asset = await _assetDataService.GetByIdAsync(id);
            if (asset == null)
                throw new InvalidOperationException($"Asset with ID {id} not found");

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

            await _assetDataService.UpdateAsync(asset);
        }

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

        public async Task<int> GetTotalAssetCountAsync()
        {
            return await _assetDataService.CountAsync();
        }

        private AssetDTO MapToDTO(Assets asset)
        {
            return new AssetDTO
            {
                Id = asset.Id,
                Name = asset.Name,
                LocationId = asset.LocationId,
                LocationName = asset.Location?.Name,
                CreatedDate = asset.CreatedDate
            };
        }
    }
}