using Fitness_core_BE.Exceptions;
using Fitness_core_BE.Helpers;
using Fitness_core_BE.Interfaces.Services;
using Fitness_core_BE.Models;
using Fitness_core_BE.Models.IOs;

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

        public AccessDeviceFunctionHandler(IAccessDeviceService accessDeviceService)
        {
            // Admin-auth actions only. The cloud no longer talks to devices directly:
            //  - AddDevice / RemoveDevice / GeneratePairingCode are pure DB operations.
            //  - AddUser / WhiteListMember / BlackListMember do their local DB work and
            //    ENQUEUE a DeviceCommand for the on-prem agent to execute.
            // Device communication (attendance pull, command execution, enrollment)
            // is handled by the agent against the AgentApiKey-protected endpoints in AgentController.
            _functionHandler = new()
            {
                { "AddDevice", (payload, _) => accessDeviceService.AddDevice(payload) },
                { "RemoveDevice", (payload, _) => accessDeviceService.RemoveDevice(payload) },
                { "GeneratePairingCode", (payload, _) => accessDeviceService.GeneratePairingCode(payload) },
                { "AddUser", AddUser },
                { "WhiteListMember", WhiteListMember },
                { "BlackListMember", BlackListMember }
            };

            Task<object> AddUser(object payload, HttpContext _)
            {
                var data = DeserializePayload.Deserialize(payload);
                var customerAccess = new CustomerAccess
                {
                    Name = DataExtractor.GetRequiredString(data, "Name"),
                    FKDeviceId = DataExtractor.GetRequiredGuid(data, "FKDeviceId"),
                    FKCustomerId = DataExtractor.GetRequiredGuid(data, "FKCustomerId")
                };

                return accessDeviceService.AddUser(customerAccess);
            }

            Task<object> WhiteListMember(object payload, HttpContext _)
            {
                var data = DeserializePayload.Deserialize(payload);
                var customerId = DataExtractor.GetRequiredGuid(data, "customerId");
                return accessDeviceService.WhiteListMember(customerId).ContinueWith(t => (object)t.Result);
            }

            Task<object> BlackListMember(object payload, HttpContext _)
            {
                var data = DeserializePayload.Deserialize(payload);
                var customerId = DataExtractor.GetRequiredGuid(data, "customerId");
                return accessDeviceService.BlackListMember(customerId).ContinueWith(t => (object)t.Result);
            }
        }

        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 (UnauthorizedException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 401,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (NotFoundException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 404,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (BadRequestException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 400,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (ForbiddenException ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 403,
                    Message = ex.Message,
                    Data = null!
                };
            }
            catch (Exception ex)
            {
                return new ApiResponse<object>
                {
                    StatusCode = 500,
                    Message = $"An error occurred: {ex.Message}",
                    Data = null!
                };
            }
        }
    }
}