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



namespace Fitness_core_BE.Services.Feed
{
    public class FeedService : IFeedService
    {
        // DocumentTypes.DocumentId for FEED_POST (seeded in CentralDbContext/AppDBContext).
        private const int FeedPostDocumentTypeId = 1005;

        private readonly IFeedRepository _repository;
        private readonly UserRoleHelper _userRoleHelper;
        private readonly IUnitOfWork _uow;
        private readonly IActivityLogService _activityLogService;
        private readonly IDocumentService _documentService;
        private readonly IPushNotificationService _pushNotificationService;

        public FeedService(IFeedRepository repository, UserRoleHelper userRoleHelper, IUnitOfWork uow, IActivityLogService activityLogService, IDocumentService documentService, IPushNotificationService pushNotificationService)
        {
            _repository = repository;
            _userRoleHelper = userRoleHelper;
            _uow = uow;
            _activityLogService = activityLogService;
            _documentService = documentService;
            _pushNotificationService = pushNotificationService;
        }









        public async Task<object> GetFeedPostById(object payload, HttpContext httpContext)
        {
            var data = DeserializePayload.Deserialize(payload);
            Guid userId = DataExtractor.GetUserIdFromContext(httpContext);
            Guid postId = DataExtractor.GetRequiredGuid(data, "postId");

            FeedPost post = await _repository.GetFeedPostByIdAsync(userId, postId);

            return post;
        }



       


   


        public async Task<object> GetFeedForCustomer(object payload, HttpContext httpContext)
        {
            try
            {
                var data = DeserializePayload.Deserialize(payload);
                Guid userId = DataExtractor.GetUserIdFromContext(httpContext);
                int skip = data.ContainsKey("skip") && data["skip"].TryGetInt32(out var skipValue) ? skipValue : 0;
                int take = data.ContainsKey("take") && data["take"].TryGetInt32(out var takeValue) ? takeValue : 10;

                // A customer with no active gym has no single client feed to scope to — the
                // repository already falls back to the platform-wide feed for them (clientId
                // stays null), so this no longer short-circuits to an empty list.
                var (clientId, feedList) =
                    await _repository.GetFeedForCustomerAsync(userId, skip, take);

                var feedListWithLikeCount = new List<object>();
                foreach (var feed in feedList)
                {
                    var likeCount = await _repository.GetLikeCountAsync(feed.FeedPostId);
                    feedListWithLikeCount.Add(new
                    {
                        feedPostId = feed.FeedPostId,
                        caption = feed.Caption,
                        description = feed.Description,
                        userId = feed.FKUserId,
                        docId = feed.FkDocId,
                        isActive = feed.IsActive,
                        createdAt = feed.CreatedAt,
                        creator = feed.User.UserName,
                        likeCount,
                        clientId = clientId
                    });
                }

                return feedListWithLikeCount;
            }
            catch
            {
                throw;
            }
        }

        //like 
        public async Task<object> LikeAsync(object payload, HttpContext httpContext)
        {
            await _uow.BeginAsync();
            try
            {
                var data = DeserializePayload.Deserialize(payload);
                Guid userId = DataExtractor.GetUserIdFromContext(httpContext);
                Guid postId = Guid.Parse(data["postId"].GetString()!);
                

                if (!await _repository.IsLikedAsync(postId, userId))
                {
                    await _repository.AddLikeAsync(postId, userId);
                    await _uow.CommitAsync();

                    return new { success = true, message = "Post liked successfully" };
                }

                return new { success = false, message = "Post already liked" };
            }
            catch
            {
                await _uow.RollbackAsync();
                throw;
            }
        }



        //check like
        public async Task<object> IsLikedAsync(object payload, HttpContext httpContext)
        {
            try
            {
                Guid userId = DataExtractor.GetUserIdFromContext(httpContext);
                var data = DeserializePayload.Deserialize(payload);
                Guid postId = Guid.Parse(data["postId"].GetString()!);
                bool isLiked = await _repository.IsLikedAsync(postId, userId);
                return new { isLiked };
            }
            catch
            {
                throw;
            }
        }


        public async Task<object> UnlikeAsync(object payload, HttpContext httpContext)
        {
            await _uow.BeginAsync();
            try
            {
                var data = DeserializePayload.Deserialize(payload);
                Guid postId = Guid.Parse(data["postId"].GetString()!);
                Guid userId = Guid.Parse(data["userId"].GetString()!);

                if (await _repository.IsLikedAsync(postId, userId))
                {
                    await _repository.RemoveLikeAsync(postId, userId);
                    await _uow.CommitAsync();

                    return new { success = true, message = "Post unliked successfully" };
                }

                return new { success = false, message = "Post not liked yet" };
            }
            catch
            {
                await _uow.RollbackAsync();
                throw;
            }
        }





        //create feed
        public async Task<object> CreateFeed(object payload, HttpContext httpContext)
        {
            await _uow.BeginAsync();
            try
            {
                var data = DeserializePayload.Deserialize(payload);
                Guid userId = DataExtractor.GetUserIdFromContext(httpContext);

                // Tag every attachment with the FEED_POST document type unless the caller
                // already chose one. Must match a DocumentTypes row (UserDocuments FKs to it).
                object uploadPayload = payload;
                
                if (data.TryGetValue("document", out var documentsElement) && 
                    documentsElement.ValueKind == System.Text.Json.JsonValueKind.Array)
                {
                    var payloadJson = System.Text.Json.JsonSerializer.Serialize(data);
                    var payloadDict = System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, object>>(
                        payloadJson) ?? new Dictionary<string, object>();
                    
                    var documentsArray = System.Text.Json.JsonSerializer.Deserialize<List<Dictionary<string, object>>>(
                        documentsElement.GetRawText()) ?? new List<Dictionary<string, object>>();
                    
                    foreach (var document in documentsArray)
                    {
                        if (!document.ContainsKey("FileType"))
                        {
                            document["FileType"] = FeedPostDocumentTypeId;
                        }
                    }
                    
                    payloadDict["document"] = documentsArray;
                    uploadPayload = payloadDict;
                }

                var docResponseObj = await _documentService.UploadDocument(uploadPayload, httpContext);

                dynamic docResponse = docResponseObj;

                if (docResponse == null || docResponse?.uploadResults == null || docResponse?.uploadResults.Count == 0)
                {
                    await _uow.RollbackAsync();
                    return new { success = false, message = "Document upload failed" };
                }

                var firstDoc = docResponse?.uploadResults[0];
                int docId = firstDoc?.DocumentId ?? 0;

                var feedPost = new FeedPost
                {
                    Caption = data.ContainsKey("caption") ? data["caption"].GetString() : null,
                    Description = data.ContainsKey("description") ? data["description"].GetString() : null,
                    FkDocId = docId,
                    FKUserId = userId
                };

                await _repository.CreateFeedAsync(feedPost);

                await _uow.CommitAsync();

                try
                {
                    var customerIds = await _repository.GetActiveCustomerIdsByPosterUserIdAsync(userId);
                    if (customerIds.Count > 0)
                    {
                        var caption = feedPost.Caption;
                        var body = string.IsNullOrWhiteSpace(caption)
                            ? "Your gym shared a new post. Tap to view."
                            : caption!.Length > 120 ? caption[..120] + "…" : caption;

                        await _pushNotificationService.NotifyCustomersAsync(
                            customerIds,
                            "New post from your gym",
                            body,
                            "FeedPostCreated",
                            "MainTabs",
                            new { screen = "Connect" }
                        );
                    }
                }
                catch (Exception notifyEx)
                {
                    Console.WriteLine($"Push notification failed (non-critical): {notifyEx.Message}");
                }

                return new { success = true, message = "Feed created successfully" };
            }
            catch
            {
                await _uow.RollbackAsync();
                throw;
            }
        }

        public async Task<object> ShowFeedByClient(object payload, HttpContext httpContext)
        {
            try
            {
                var data = DeserializePayload.Deserialize(payload);
                Guid userId = DataExtractor.GetUserIdFromContext(httpContext);
                Guid clientId = await _userRoleHelper.GetClientId(userId);
                var feedList = await _repository.GetFeedByClientAsync(clientId);

                if (feedList == null || !feedList.Any())
                {
                    return new { success = false, message = "No feeds found", data = new List<object>() };
                }

                var FeedListWithDoc = new List<object>();

                foreach (var feed in feedList)
                {
                    object? documentData = null;
                    if (feed.FkDocId.HasValue)
                    {
                        try
                        {
                            var docPayload = new { documentId = feed.FkDocId.Value };
                            documentData = await _documentService.GetDocumentById(docPayload, httpContext);
                        }
                        catch
                        {
                            documentData = null;
                        }
                    }

                    var likeCount = await _repository.GetLikeCountAsync(feed.FeedPostId);

                    FeedListWithDoc.Add(new
                    {
                        feedPostId = feed.FeedPostId,
                        caption = feed.Caption,
                        description = feed.Description,
                        userId = feed.FKUserId,
                        docId = feed.FkDocId,
                        isActive = feed.IsActive,
                        createdAt = feed.CreatedAt,
                        likeCount = likeCount,
                        document = documentData
                    });
                }

                return new { success = true, message = "Feeds retrieved successfully", data = FeedListWithDoc };
            }
            catch
            {
                await _uow.RollbackAsync();
                throw;
            }
        }

        public async Task<object> DeleteFeedByPostId(object payload, HttpContext httpContext)
        {
            var data = DeserializePayload.Deserialize(payload);

            Guid createUserId = DataExtractor.GetUserIdFromContext(httpContext);
            Guid postId = DataExtractor.GetRequiredGuid(data, "postId");
            await _uow.BeginAsync();

            try
            {
                var result =await _repository.DeletePostPostIdAsync(createUserId, postId);
                await _uow.CommitAsync();
                return result;
            }
            catch
            {
                await _uow.RollbackAsync();
                throw new BadRequestException ("delete post failed") ;
            }
        }
    }
}