using Data.SeaHavenIndustries;
using SeaHaven.Services.DTOs;

namespace SeaHaven.Services.Helpers
{
    public static class WorkOrderCommentProjection
    {
        public static WorkOrderCommentDto ToDto(
            Comments comment,
            IReadOnlyDictionary<string, string>? displayNames = null)
        {
            return new WorkOrderCommentDto
            {
                Id = comment.Id,
                AuthorId = comment.UserId,
                AuthorName = ResolveAuthorName(comment, displayNames),
                Text = comment.Commenttext ?? "",
                Time = (comment.CreatedDate ?? DateTime.UtcNow).ToUniversalTime().ToString("o"),
                Documents = comment.Documents
            };
        }

        public static List<WorkOrderCommentDto> ToDtos(
            IEnumerable<Comments> comments,
            IReadOnlyDictionary<string, string>? displayNames = null)
            => comments.Select(c => ToDto(c, displayNames)).ToList();

        public static IEnumerable<string> CollectAuthorUserIds(IEnumerable<Comments> comments)
            => comments
                .Where(c => !string.IsNullOrWhiteSpace(c.UserId))
                .Select(c => c.UserId!)
                .Distinct(StringComparer.Ordinal);

        private static string? ResolveAuthorName(
            Comments comment,
            IReadOnlyDictionary<string, string>? displayNames)
        {
            if (!string.IsNullOrWhiteSpace(comment.UserId)
                && displayNames != null
                && displayNames.TryGetValue(comment.UserId, out var name)
                && !string.IsNullOrWhiteSpace(name))
            {
                return name;
            }

            if (!string.IsNullOrWhiteSpace(comment.Commenter))
                return comment.Commenter.Trim();

            return null;
        }
    }
}