using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Microsoft.EntityFrameworkCore;

namespace Nuuru.Server.Models
{
    public enum NotificationType
    {
        CommentOnPost = 0,
        Mention = 1,
        SystemAnnouncement = 2,
        PostApproved = 3,
        PostRejected = 4,
        ReportResolved = 5,
        ReportDismissed = 6,
        PrivateMessage = 7,
        WatchedPostComment = 8,
        WatchedThreadReply = 9,
        PostTrashed = 10,
        PostRestored = 11,
        ForumQuote = 12,
        Reaction = 13,
        GroupMessage = 14,
        FriendAdded = 15,
        EnemyAdded = 16,
        FriendRemoved = 17
    }

    [Index(nameof(UserId), nameof(IsRead))]
    public class Notification
    {
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public Guid Id { get; set; } = Guid.NewGuid();

        [Required]
        public NotificationType Type { get; set; }

        [Required]
        [MaxLength(500)]
        public string Message { get; set; } = string.Empty;

        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
        public bool IsRead { get; set; } = false;

        // Related entity IDs for navigation
        public int? RelatedPostId { get; set; }      // Booru post
        public int? RelatedCommentId { get; set; }   // Booru comment
        public int? RelatedForumPostId { get; set; } // Forum post
        public int? RelatedForumThreadId { get; set; } // Forum thread (for watch notifications)
        [MaxLength(100)]
        public string? RelatedForumCategorySlug { get; set; } // Forum category slug (for building URLs)
        public Guid? RelatedConversationId { get; set; } // Private message conversation
        public int? RelatedMessageId { get; set; }   // Private message

        // Reaction emote name (for reaction notifications)
        [MaxLength(32)]
        public string? ReactionEmoteName { get; set; }

        // User who triggered the notification (null for system announcements)
        public Guid? TriggeredByUserId { get; set; }
        public ApplicationUser? TriggeredByUser { get; set; }

        // User receiving the notification
        public Guid UserId { get; set; }
        public ApplicationUser User { get; set; } = null!;
    }
}