// Copyright (c) Umbraco.
// See LICENSE for more details.

using System.Globalization;
using Microsoft.Extensions.DependencyInjection;
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Scoping;
using Umbraco.Cms.Core.Security;
using Umbraco.Cms.Core.Services;
using Umbraco.Extensions;

namespace Umbraco.Cms.Core.Events;

// TODO: lots of duplicate code in this one, refactor
public sealed class RelateOnTrashNotificationHandler :
    INotificationHandler<ContentMovedNotification>,
    INotificationHandler<ContentMovedToRecycleBinNotification>,
    INotificationHandler<MediaMovedNotification>,
    INotificationHandler<MediaMovedToRecycleBinNotification>
{
    private readonly IAuditService _auditService;
    private readonly IEntityService _entityService;
    private readonly IRelationService _relationService;
    private readonly ICoreScopeProvider _scopeProvider;
    private readonly IBackOfficeSecurityAccessor _backOfficeSecurityAccessor;
    private readonly ILocalizedTextService _textService;

    [Obsolete("Use the new constructor instead, will be removed in V16")]
    public RelateOnTrashNotificationHandler(
        IRelationService relationService,
        IEntityService entityService,
        ILocalizedTextService textService,
        IAuditService auditService,
        IScopeProvider scopeProvider)
    : this(relationService, entityService, textService, auditService, scopeProvider, StaticServiceProvider.Instance.GetRequiredService<IBackOfficeSecurityAccessor>())
    {
    }

    public RelateOnTrashNotificationHandler(
        IRelationService relationService,
        IEntityService entityService,
        ILocalizedTextService textService,
        IAuditService auditService,
        IScopeProvider scopeProvider,
        IBackOfficeSecurityAccessor backOfficeSecurityAccessor)
    {
        _relationService = relationService;
        _entityService = entityService;
        _textService = textService;
        _auditService = auditService;
        _scopeProvider = scopeProvider;
        _backOfficeSecurityAccessor = backOfficeSecurityAccessor;
    }

    public void Handle(ContentMovedNotification notification)
    {
        foreach (MoveEventInfo<IContent> item in notification.MoveInfoCollection.Where(x =>
                     x.OriginalPath.Contains(Constants.System.RecycleBinContentString)))
        {
            const string relationTypeAlias = Constants.Conventions.RelationTypes.RelateParentDocumentOnDeleteAlias;
            IEnumerable<IRelation> relations = _relationService.GetByChildId(item.Entity.Id);

            foreach (IRelation relation in
                     relations.Where(x => x.RelationType.Alias.InvariantEquals(relationTypeAlias)))
            {
                _relationService.Delete(relation);
            }
        }
    }

    public void Handle(ContentMovedToRecycleBinNotification notification)
    {
        using (ICoreScope scope = _scopeProvider.CreateCoreScope())
        {
            const string relationTypeAlias = Constants.Conventions.RelationTypes.RelateParentDocumentOnDeleteAlias;
            IRelationType? relationType = _relationService.GetRelationTypeByAlias(relationTypeAlias);

            // check that the relation-type exists, if not, then recreate it
            if (relationType == null)
            {
                Guid documentObjectType = Constants.ObjectTypes.Document;
                const string relationTypeName = Constants.Conventions.RelationTypes.RelateParentDocumentOnDeleteName;

                relationType = new RelationType(relationTypeName, relationTypeAlias, false, documentObjectType, documentObjectType, false);
                _relationService.Save(relationType);
            }

            foreach (MoveToRecycleBinEventInfo<IContent> item in notification.MoveInfoCollection)
            {
                IList<string> originalPath = item.OriginalPath.ToDelimitedList();
                var originalParentId = originalPath.Count > 2
                    ? int.Parse(originalPath[originalPath.Count - 2], CultureInfo.InvariantCulture)
                    : Constants.System.Root;

                // before we can create this relation, we need to ensure that the original parent still exists which
                // may not be the case if the encompassing transaction also deleted it when this item was moved to the bin
                if (_entityService.Exists(originalParentId))
                {
                    // Add a relation for the item being deleted, so that we can know the original parent for if we need to restore later
                    IRelation relation =
                        _relationService.GetByParentAndChildId(originalParentId, item.Entity.Id, relationType) ??
                        new Relation(originalParentId, item.Entity.Id, relationType);
                    _relationService.Save(relation);

                    _auditService.Add(
                        AuditType.Delete,
                        _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser?.Id ?? item.Entity.WriterId,
                        item.Entity.Id,
                        UmbracoObjectTypes.Document.GetName(),
                        string.Format(_textService.Localize("recycleBin", "contentTrashed"), item.Entity.Id, originalParentId));
                }
            }

            scope.Complete();
        }
    }

    public void Handle(MediaMovedNotification notification)
    {
        foreach (MoveEventInfo<IMedia> item in notification.MoveInfoCollection.Where(x =>
                     x.OriginalPath.Contains(Constants.System.RecycleBinMediaString)))
        {
            const string relationTypeAlias = Constants.Conventions.RelationTypes.RelateParentMediaFolderOnDeleteAlias;
            IEnumerable<IRelation> relations = _relationService.GetByChildId(item.Entity.Id);
            foreach (IRelation relation in
                     relations.Where(x => x.RelationType.Alias.InvariantEquals(relationTypeAlias)))
            {
                _relationService.Delete(relation);
            }
        }
    }

    public void Handle(MediaMovedToRecycleBinNotification notification)
    {
        using (ICoreScope scope = _scopeProvider.CreateCoreScope())
        {
            const string relationTypeAlias = Constants.Conventions.RelationTypes.RelateParentMediaFolderOnDeleteAlias;
            IRelationType? relationType = _relationService.GetRelationTypeByAlias(relationTypeAlias);

            // check that the relation-type exists, if not, then recreate it
            if (relationType == null)
            {
                Guid documentObjectType = Constants.ObjectTypes.Document;
                const string relationTypeName = Constants.Conventions.RelationTypes.RelateParentMediaFolderOnDeleteName;
                relationType = new RelationType(relationTypeName, relationTypeAlias, false, documentObjectType, documentObjectType, false);
                _relationService.Save(relationType);
            }

            foreach (MoveToRecycleBinEventInfo<IMedia> item in notification.MoveInfoCollection)
            {
                IList<string> originalPath = item.OriginalPath.ToDelimitedList();
                var originalParentId = originalPath.Count > 2
                    ? int.Parse(originalPath[originalPath.Count - 2], CultureInfo.InvariantCulture)
                    : Constants.System.Root;

                // before we can create this relation, we need to ensure that the original parent still exists which
                // may not be the case if the encompassing transaction also deleted it when this item was moved to the bin
                if (_entityService.Exists(originalParentId))
                {
                    // Add a relation for the item being deleted, so that we can know the original parent for if we need to restore later
                    IRelation relation =
                        _relationService.GetByParentAndChildId(originalParentId, item.Entity.Id, relationType) ??
                        new Relation(originalParentId, item.Entity.Id, relationType);
                    _relationService.Save(relation);
                    _auditService.Add(
                        AuditType.Delete,
                        _backOfficeSecurityAccessor.BackOfficeSecurity?.CurrentUser?.Id ?? item.Entity.WriterId,
                        item.Entity.Id,
                        UmbracoObjectTypes.Media.GetName(),
                        string.Format(_textService.Localize("recycleBin", "mediaTrashed"), item.Entity.Id, originalParentId));
                }
            }

            scope.Complete();
        }
    }
}