using Data.SeaHavenIndustries;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Exceptions;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Interfaces;

namespace SeaHaven.Services.Implementation
{
    public class WorkOrderCommentService : IWorkOrderCommentService
    {
        private readonly IWorkOrderDetailDataService _detailData;
        private readonly ICommentDataService _commentData;
        private readonly IUserDataService _userDataService;

        public WorkOrderCommentService(
            IWorkOrderDetailDataService detailData,
            ICommentDataService commentData,
            IUserDataService userDataService)
        {
            _detailData = detailData;
            _commentData = commentData;
            _userDataService = userDataService;
        }

        public async Task<IReadOnlyList<WorkOrderCommentDto>?> GetCommentsAsync(int workOrderId)
        {
            if (!await _detailData.ExistsAsync(workOrderId))
                return null;

            var comments = await _detailData.GetCommentsAsync(workOrderId);
            var authorNames = await ResolveAuthorNamesAsync(comments);
            return WorkOrderCommentProjection.ToDtos(comments, authorNames);
        }

        public async Task<WorkOrderCommentDto> AddCommentAsync(
            int workOrderId,
            WorkOrderCommentCreateDto request,
            string? actorId,
            string? documentUrl = null)
        {
            if (!await _detailData.ExistsAsync(workOrderId))
                throw new WorkOrderBoardValidationException("NotFound", "Work order not found.");

            if (string.IsNullOrWhiteSpace(request.Text))
                throw new WorkOrderBoardValidationException("InvalidValue", "Comment text is required.");

            var comment = new Comments
            {
                WorkerOrderId = workOrderId,
                UserId = actorId,
                Commenttext = request.Text.Trim(),
                CommentType = "General",
                RecordType = "WorkOrder",
                Documents = documentUrl,
                CreatedDate = DateTime.UtcNow
            };

            var saved = await _commentData.AddAsync(comment);
            var authorNames = await ResolveAuthorNamesAsync(new[] { saved });
            return WorkOrderCommentProjection.ToDto(saved, authorNames);
        }

        public async Task<WorkOrderCommentDto> UpdateCommentAsync(
            int workOrderId,
            int commentId,
            WorkOrderCommentCreateDto request,
            string? actorId,
            bool isAdmin)
        {
            var workOrder = await _detailData.GetWorkOrderForMediaAsync(workOrderId);
            if (workOrder == null)
                throw new WorkOrderBoardValidationException("NotFound", "Work order not found.");

            if (WorkOrderBoardMutationRules.IsReadOnly(workOrder.LifecycleStatus))
                throw new WorkOrderBoardValidationException("ReadOnly", "Work order is read-only in its current status.");

            if (string.IsNullOrWhiteSpace(request.Text))
                throw new WorkOrderBoardValidationException("InvalidValue", "Comment text is required.");

            var comment = await _commentData.GetByIdAsync(commentId);
            if (comment == null || comment.WorkerOrderId != workOrderId || comment.IsDeleted == true)
                throw new WorkOrderBoardValidationException("NotFound", "Comment not found.");

            if (!IsBoardEditableComment(comment))
                throw new WorkOrderBoardValidationException(
                    "NotEditable",
                    "Only board comments (CommentType General) can be edited via this endpoint.");

            var isAuthor = !string.IsNullOrWhiteSpace(actorId)
                && string.Equals(comment.UserId, actorId, StringComparison.Ordinal);
            if (!isAuthor && !isAdmin)
                throw new WorkOrderBoardValidationException("Forbidden", "You are not allowed to edit this comment.");

            comment.Commenttext = request.Text.Trim();
            comment.LastModificationTime = DateTime.UtcNow;
            await _commentData.UpdateAsync(comment);

            var authorNames = await ResolveAuthorNamesAsync(new[] { comment });
            return WorkOrderCommentProjection.ToDto(comment, authorNames);
        }

        private static bool IsBoardEditableComment(Comments comment)
            => string.Equals(comment.CommentType, "General", StringComparison.OrdinalIgnoreCase)
               && string.Equals(comment.RecordType, "WorkOrder", StringComparison.OrdinalIgnoreCase);

        private async Task<IReadOnlyDictionary<string, string>> ResolveAuthorNamesAsync(
            IEnumerable<Comments> comments)
        {
            var authorIds = WorkOrderCommentProjection.CollectAuthorUserIds(comments);
            return await _userDataService.GetDisplayNamesByIdsAsync(authorIds);
        }
    }
}