using Fitness_core_BE.Models.IOs;
using Fitness_core_BE.Services.Document;
using Fitness_core_BE.Interfaces.Services;

namespace Fitness_core_BE.Services.FunctionHandler
{
    public class DocumentFunctionHandler
    {
        public readonly Dictionary<string, Func<object, HttpContext, Task<object>>> _functionHandler;

        public DocumentFunctionHandler(IDocumentService documentService)
        {
            _functionHandler = new()
            {
                { "UploadDocument", documentService.UploadDocument },
                { "GetDocumentsByUserId", documentService.GetDocumentsByUserId },
                { "GetDocumentById", documentService.GetDocumentById },
                { "RemoveDocument", documentService.RemoveDocument }
            };
        }

        public async Task<ApiResponse<object>> Execute(ApiRequest request, HttpContext httpContext)
        {
            if (!_functionHandler.TryGetValue(request.FunctionName, out var handler))
            {
                return new ApiResponse<object>
                {
                    StatusCode = 404,
                    Message = $"Function '{request.FunctionName}' not found.",
                    Data = null!
                };
            }
            try
            {
                var results = await handler(request.Payload, httpContext);
                return new ApiResponse<object>
                {
                    StatusCode = 200,
                    Message = "success",
                    Data = results
                };
            }
            catch (UnauthorizedAccessException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 401,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (KeyNotFoundException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 400,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (InvalidOperationException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 400,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (FileNotFoundException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 404,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (Exception ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 500,
                    Message = $"An error occurred: {ex.Message}",
                    Data = null!
                };
            }
        }
    }
}