using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Authorization;
using AyaNova.Models;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Biz;
using AyaNova.DataList;
using System.Threading.Tasks;
using System.Linq;
using EnumsNET;
using Microsoft.EntityFrameworkCore;

namespace AyaNova.Api.Controllers
{

    [ApiController]
    [ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/data-list")]
    [Produces("application/json")]
    [Authorize]
    public class DataListController : ControllerBase
    {
        private readonly AyContext ct;
        private readonly ILogger<DataListController> log;
        private readonly ApiServerState serverState;



        /// <summary>
        /// ctor
        /// </summary>
        /// <param name="dbcontext"></param>
        /// <param name="logger"></param>
        /// <param name="apiServerState"></param>
        public DataListController(AyContext dbcontext, ILogger<DataListController> logger, ApiServerState apiServerState)
        {
            ct = dbcontext;
            log = logger;
            serverState = apiServerState;
        }


        /// <summary>
        ///  Get list of data for selection / viewing
        /// 
        /// Authorization varies list by list, will return 403 - Not Authorized if user has insufficient role
        /// 
        /// </summary>
        /// <param name="tableRequest">List key, Paging, filtering and sorting options</param>
        /// <returns>Collection with paging data</returns>
        // [HttpPost("List", Name = nameof(List))]
        [HttpPost]
        public async Task<IActionResult> List([FromBody] DataListTableRequest tableRequest)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));

            if (tableRequest.Limit == null || tableRequest.Limit < 1)
            {
                tableRequest.Limit = DataListTableProcessingOptions.DefaultLimit;
            }
            if (tableRequest.Offset == null)
            {
                tableRequest.Offset = 0;
            }


            var UserRoles = UserRolesFromContext.Roles(HttpContext.Items);
            var UserId = UserIdFromContext.Id(HttpContext.Items);
            var UType = UserTypeFromContext.Type(HttpContext.Items);

            try
            {

                DataListColumnViewBiz viewbiz = DataListColumnViewBiz.GetBiz(ct, HttpContext);
                var SavedView = await viewbiz.GetAsync(UserId, tableRequest.DataListKey, true);

                DataListSavedFilter SavedFilter = null;
                if (tableRequest.FilterId != 0)
                {
                    DataListSavedFilterBiz filterbiz = DataListSavedFilterBiz.GetBiz(ct, HttpContext);
                    SavedFilter = await filterbiz.GetAsync(tableRequest.FilterId);
                }
                var DataList = DataListFactory.GetAyaDataList(tableRequest.DataListKey);
                if (DataList == null)
                    return BadRequest(new ApiErrorResponse(ApiErrorCode.NOT_FOUND, "DataListKey", $"DataList \"{tableRequest.DataListKey}\" specified does not exist"));

                //check rights
                if (!UserRoles.HasAnyFlags(DataList.AllowedRoles))
                    return StatusCode(403, new ApiNotAuthorizedResponse());

                //IF user is a customer type check if they are allowed to view this datalist
                if (UType == UserType.Customer || UType == UserType.HeadOffice)
                    if (!await HandleCustomerTypeUserDataListRequest(UserId, tableRequest))
                        return StatusCode(403, new ApiNotAuthorizedResponse());

                //hydrate the saved view and filter
                DataListTableProcessingOptions dataListTableOptions = new DataListTableProcessingOptions(tableRequest, DataList, SavedView, SavedFilter, UserId, UserRoles);
                DataListReturnData r = await DataListFetcher.GetResponseAsync(ct, dataListTableOptions, DataList, UserRoles, log, UserId);
                return Ok(r);
            }
            catch (System.UnauthorizedAccessException)
            {
                return StatusCode(403, new ApiNotAuthorizedResponse());
            }
            catch (System.ArgumentOutOfRangeException e)
            {
                return BadRequest(new ApiErrorResponse(ApiErrorCode.NOT_FOUND, null, e.Message));

            }
        }

        private async Task<bool> HandleCustomerTypeUserDataListRequest(long currentUserId, DataListTableRequest tableRequest)
        {
            //Is this list allowed for a customer user and also enabled in global settings
            switch (tableRequest.DataListKey)
            {
                case "CustomerServiceRequestDataList":
                    if (!AyaNova.Util.ServerGlobalBizSettings.Cache.CustomerAllowCSR)
                        return false;
                    break;
                //todo: workorder list
                default:
                    return false;
            }

            //Build client criteria if user is of correct type
            var UserInfo = await ct.User.AsNoTracking().Select(x => new { x.UserType, x.CustomerId, x.HeadOfficeId }).FirstOrDefaultAsync();
            switch (UserInfo.UserType)
            {
                case UserType.Customer:
                    if (UserInfo.CustomerId == null || UserInfo.CustomerId == 0) return false;
                    tableRequest.ClientCriteria = $"{UserInfo.CustomerId},{(int)AyaType.Customer}";
                    break;
                case UserType.HeadOffice:
                    if (UserInfo.HeadOfficeId == null || UserInfo.HeadOfficeId == 0) return false;
                    tableRequest.ClientCriteria = $"{UserInfo.HeadOfficeId},{(int)AyaType.HeadOffice}";
                    break;
                default://other user types can fuck right off!
                    return false;
            }
            return true;
        }

        /// <summary>
        /// List of all DataList keys available
        /// </summary>        
        /// <returns>List of strings</returns>
        [HttpGet("listkeys")]
        public ActionResult GetDataListKeys()
        {
            //NOTE: not used by AyaNova Client, convenience method for developers api usage
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));

            return Ok(ApiOkResponse.Response(DataListFactory.GetListOfAllDataListKeyNames()));
        }


        /// <summary>
        /// List of all fields for data list key specified
        /// </summary>        
        /// <returns>List of DataListFieldDefinition</returns>
        [HttpGet("listfields")]
        public ActionResult GetDataListFields([FromQuery] string DataListKey)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));

            var DataList = DataListFactory.GetAyaDataList(DataListKey);
            //was the name not found as a list?
            if (DataList == null)
            {
                return BadRequest(new ApiErrorResponse(ApiErrorCode.NOT_FOUND, null, $"DataList \"{DataListKey}\" specified does not exist"));
            }

            var ExternalOnly = DataList.FieldDefinitions.Where(z => z.IsMeta == false);
            return Ok(ApiOkResponse.Response(ExternalOnly));
        }

    }//eoc
}//ens