using NPoco;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Models.Entities;
using Umbraco.Cms.Core.Persistence.Querying;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Infrastructure.Persistence.Dtos;
using Umbraco.Cms.Infrastructure.Persistence.Querying;
using Umbraco.Cms.Infrastructure.Persistence.SqlSyntax;
using Umbraco.Cms.Infrastructure.Scoping;
using Umbraco.Extensions;
using static Umbraco.Cms.Core.Persistence.SqlExtensionsStatics;

namespace Umbraco.Cms.Infrastructure.Persistence.Repositories.Implement;

/// <summary>
///     Represents the EntityRepository used to query entity objects.
/// </summary>
/// <remarks>
///     <para>Limited to objects that have a corresponding node (in umbracoNode table).</para>
///     <para>Returns <see cref="IEntitySlim" /> objects, i.e. lightweight representation of entities.</para>
/// </remarks>
internal sealed class EntityRepository : RepositoryBase, IEntityRepositoryExtended
{
    public EntityRepository(IScopeAccessor scopeAccessor, AppCaches appCaches)
        : base(scopeAccessor, appCaches)
    {
    }

    #region Repository

    public int CountByQuery(IQuery<IUmbracoEntity> query, IEnumerable<Guid> objectTypes, IQuery<IUmbracoEntity>? filter)
    {
        Sql<ISqlContext> sql = Sql();
        sql.SelectCount();
        sql
            .From<NodeDto>();
        sql.WhereIn<NodeDto>(x => x.NodeObjectType, objectTypes);

        foreach (Tuple<string, object[]> queryClause in query.GetWhereClauses())
        {
            sql.Where(queryClause.Item1, queryClause.Item2);
        }

        if (filter is not null)
        {
            foreach (Tuple<string, object[]> filterClause in filter.GetWhereClauses())
            {
                sql.Where(filterClause.Item1, filterClause.Item2);
            }
        }

        return Database.ExecuteScalar<int>(sql);
    }

    public IEnumerable<IEntitySlim> GetPagedResultsByQuery(IQuery<IUmbracoEntity> query, ISet<Guid> objectTypes,
        long pageIndex, int pageSize, out long totalRecords,
        IQuery<IUmbracoEntity>? filter, Ordering? ordering) =>
        GetPagedResultsByQuery(query, objectTypes.ToArray(), pageIndex, pageSize, out totalRecords, filter, ordering);


    // get a page of entities
    public IEnumerable<IEntitySlim> GetPagedResultsByQuery(IQuery<IUmbracoEntity> query, Guid[] objectTypes,
        long pageIndex, int pageSize, out long totalRecords,
        IQuery<IUmbracoEntity>? filter, Ordering? ordering, Action<Sql<ISqlContext>>? sqlCustomization = null)
    {
        var isContent = objectTypes.Any(objectType =>
            objectType == Constants.ObjectTypes.Document || objectType == Constants.ObjectTypes.DocumentBlueprint);
        var isMedia = objectTypes.Any(objectType => objectType == Constants.ObjectTypes.Media);
        var isMember = objectTypes.Any(objectType => objectType == Constants.ObjectTypes.Member);

        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, s =>
        {
            sqlCustomization?.Invoke(s);

            if (filter != null)
            {
                foreach (Tuple<string, object[]> filterClause in filter.GetWhereClauses())
                {
                    s.Where(filterClause.Item1, filterClause.Item2);
                }
            }
        }, objectTypes);

        ordering ??= Ordering.ByDefault();

        var translator = new SqlTranslator<IUmbracoEntity>(sql, query);
        sql = translator.Translate();
        sql = AddGroupBy(isContent, isMedia, isMember, sql, ordering.IsEmpty);

        if (!ordering.IsEmpty)
        {
            // apply ordering
            ApplyOrdering(ref sql, ordering);
        }

        // TODO: we should be able to do sql = sql.OrderBy(x => Alias(x.NodeId, "NodeId")); but we can't because the OrderBy extension don't support Alias currently
        // no matter what we always must have node id ordered at the end
        sql = ordering.Direction == Direction.Ascending ? sql.OrderBy("NodeId") : sql.OrderByDescending("NodeId");

        // for content we must query for ContentEntityDto entities to produce the correct culture variant entity names
        var pageIndexToFetch = pageIndex + 1;
        IEnumerable<BaseDto> dtos;
        Page<GenericContentEntityDto>? page = Database.Page<GenericContentEntityDto>(pageIndexToFetch, pageSize, sql);
        dtos = page.Items;
        totalRecords = page.TotalItems;

        EntitySlim[] entities = dtos.Select(BuildEntity).ToArray();

        BuildVariants(entities.OfType<DocumentEntitySlim>());

        return entities;
    }

    public IEntitySlim? Get(Guid key)
    {
        Sql<ISqlContext> sql = GetBaseWhere(false, false, false, false, key);
        BaseDto? dto = Database.FirstOrDefault<BaseDto>(sql);
        return dto == null ? null : BuildEntity(dto);
    }


    private IEntitySlim? GetEntity(Sql<ISqlContext> sql, bool isContent, bool isMedia, bool isMember)
    {
        // isContent is going to return a 1:M result now with the variants so we need to do different things
        if (isContent)
        {
            List<DocumentEntityDto>? cdtos = Database.Fetch<DocumentEntityDto>(sql);

            return cdtos.Count == 0 ? null : BuildVariants(BuildDocumentEntity(cdtos[0]));
        }

        BaseDto? dto = isMedia
            ? Database.FirstOrDefault<MediaEntityDto>(sql)
            : Database.FirstOrDefault<BaseDto>(sql);

        if (dto == null)
        {
            return null;
        }

        EntitySlim entity = BuildEntity(dto);

        return entity;
    }

    /// <inheritdoc/>
    public IEnumerable<IEntitySlim> GetSiblings(
        Guid objectType,
        Guid targetKey,
        int before,
        int after,
        IQuery<IUmbracoEntity>? filter,
        Ordering ordering,
        out long totalBefore,
        out long totalAfter)
    {
        // Ideally we don't want to have to do a second query for the parent ID, but the siblings query is already messy enough
        // without us also having to do a nested query for the parent ID too.
        Sql<ISqlContext> parentIdQuery = Sql()
            .Select<NodeDto>(x => x.ParentId)
            .From<NodeDto>()
            .Where<NodeDto>(x => x.UniqueId == targetKey);
        var parentId = Database.ExecuteScalar<int>(parentIdQuery);

        Sql<ISqlContext> orderingSql = Sql();
        ApplyOrdering(ref orderingSql, ordering);

        // Get all children of the parent node which is not trashed, ordered by SortOrder, and assign each a row number.
        // These row numbers are important, we need them to select the "before" and "after" siblings of the target node.
        Sql<ISqlContext> rowNumberSql = Sql()
            .Select($"ROW_NUMBER() OVER ({orderingSql.SQL}) AS rn")
            .AndSelect<NodeDto>(n => n.UniqueId)
            .From<NodeDto>()
            .Where<NodeDto>(x => x.ParentId == parentId && x.Trashed == false);

        // Apply the filter if provided.  Note that in doing this, we'll add more parameters to the query, so need to track
        // how many so we can offset the parameter indexes for the "before" and "after" values added later.
        int beforeAfterParameterIndexOffset = 0;
        if (filter != null)
        {
            foreach (Tuple<string, object[]> filterClause in filter.GetWhereClauses())
            {
                rowNumberSql.Where(filterClause.Item1, filterClause.Item2);

                // We need to offset by one for each non-array parameter in the filter clause.
                // If a query is created using Contains or some other set based operation, we'll get both the array and the
                // items in the array provided in the where clauses. It's only the latter that count for applying parameters
                // to the SQL statement, and hence we should only offset by them.
                beforeAfterParameterIndexOffset += filterClause.Item2.Count(x => !x.GetType().IsArray);
            }
        }

        // Find the specific row number of the target node.
        // We need this to determine the bounds of the row numbers to select.
        Sql<ISqlContext> targetRowSql = Sql()
            .Select("rn")
            .From().AppendSubQuery(rowNumberSql, "Target")
            .Where<NodeDto>(x => x.UniqueId == targetKey, "Target");

        // We have to reuse the target row sql arguments, however, we also need to add the "before" and "after" values to the arguments.
        // If we try to do this directly in the params array it'll consider the initial argument array as a single argument.
        IEnumerable<object> beforeArguments = targetRowSql.Arguments.Concat([before]);
        IEnumerable<object> afterArguments = targetRowSql.Arguments.Concat([after]);

        // Select the UniqueId of nodes which row number is within the specified range of the target node's row number.
        const int BeforeAfterParameterIndex = 3;
        var beforeAfterParameterIndex = BeforeAfterParameterIndex + beforeAfterParameterIndexOffset;
        var beforeArgumentsArray = beforeArguments.ToArray();
        var afterArgumentsArray = afterArguments.ToArray();
        Sql<ISqlContext>? mainSql = Sql()
            .Select("UniqueId")
            .From().AppendSubQuery(rowNumberSql, "NumberedNodes")
            .Where($"rn >= ({targetRowSql.SQL}) - @{beforeAfterParameterIndex}", beforeArgumentsArray)
            .Where($"rn <= ({targetRowSql.SQL}) + @{beforeAfterParameterIndex}", afterArgumentsArray)
            .OrderBy("rn");

        List<Guid>? keys = Database.Fetch<Guid>(mainSql);

        totalBefore = GetNumberOfSiblingsOutsideSiblingRange(rowNumberSql, targetRowSql, beforeAfterParameterIndex, beforeArgumentsArray, true);
        totalAfter = GetNumberOfSiblingsOutsideSiblingRange(rowNumberSql, targetRowSql, beforeAfterParameterIndex, afterArgumentsArray, false);

        if (keys is null || keys.Count == 0)
        {
            return [];
        }

        return PerformGetAll(objectType, ordering, sql => sql.WhereIn<NodeDto>(x => x.UniqueId, keys));
    }

    private long GetNumberOfSiblingsOutsideSiblingRange(
        Sql<ISqlContext> rowNumberSql,
        Sql<ISqlContext> targetRowSql,
        int parameterIndex,
        object[] arguments,
        bool getBefore)
    {
        Sql<ISqlContext>? sql = Sql()
            .SelectCount()
            .From().AppendSubQuery(rowNumberSql, "NumberedNodes")
            .Where($"rn {(getBefore ? "<" : ">")} ({targetRowSql.SQL}) {(getBefore ? "-" : "+")} @{parameterIndex}", arguments);
        return Database.ExecuteScalar<long>(sql);
    }


    public IEntitySlim? Get(Guid key, Guid objectTypeId)
    {
        var isContent = objectTypeId == Constants.ObjectTypes.Document ||
                        objectTypeId == Constants.ObjectTypes.DocumentBlueprint;
        var isMedia = objectTypeId == Constants.ObjectTypes.Media;
        var isMember = objectTypeId == Constants.ObjectTypes.Member;

        Sql<ISqlContext> sql = GetFullSqlForEntityType(isContent, isMedia, isMember, objectTypeId, key);
        return GetEntity(sql, isContent, isMedia, isMember);
    }

    public IEntitySlim? Get(int id)
    {
        Sql<ISqlContext> sql = GetBaseWhere(false, false, false, false, id);
        BaseDto? dto = Database.FirstOrDefault<BaseDto>(sql);
        return dto == null ? null : BuildEntity(dto);
    }

    public IEntitySlim? Get(int id, Guid objectTypeId)
    {
        var isContent = objectTypeId == Constants.ObjectTypes.Document ||
                        objectTypeId == Constants.ObjectTypes.DocumentBlueprint;
        var isMedia = objectTypeId == Constants.ObjectTypes.Media;
        var isMember = objectTypeId == Constants.ObjectTypes.Member;

        Sql<ISqlContext> sql = GetFullSqlForEntityType(isContent, isMedia, isMember, objectTypeId, id);
        return GetEntity(sql, isContent, isMedia, isMember);
    }

    public IEnumerable<IEntitySlim> GetAll(Guid objectType, params int[] ids) =>
        ids.Length > 0
            ? PerformGetAll(objectType, sql => sql.WhereIn<NodeDto>(x => x.NodeId, ids.Distinct()))
            : PerformGetAll(objectType);

    public IEnumerable<IEntitySlim> GetAll(Guid objectType, params Guid[] keys) =>
        keys.Length > 0
            ? PerformGetAll(objectType, sql => sql.WhereIn<NodeDto>(x => x.UniqueId, keys.Distinct()))
            : PerformGetAll(objectType);

    private IEnumerable<IEntitySlim> GetEntities(Sql<ISqlContext> sql, bool isContent, bool isMedia, bool isMember)
    {
        // isContent is going to return a 1:M result now with the variants so we need to do different things
        if (isContent)
        {
            List<DocumentEntityDto>? cdtos = Database.Fetch<DocumentEntityDto>(sql);

            return cdtos.Count == 0
                ? Enumerable.Empty<IEntitySlim>()
                : BuildVariants(cdtos.Select(BuildDocumentEntity)).ToList();
        }

        IEnumerable<BaseDto>? dtos = isMedia
            ? (IEnumerable<BaseDto>)Database.Fetch<MediaEntityDto>(sql)
            : Database.Fetch<BaseDto>(sql);

        EntitySlim[] entities = dtos.Select(BuildEntity).ToArray();

        return entities;
    }

    private IEnumerable<IEntitySlim> PerformGetAll(Guid objectType, Action<Sql<ISqlContext>>? filter = null)
    {
        var isContent = objectType == Constants.ObjectTypes.Document ||
                        objectType == Constants.ObjectTypes.DocumentBlueprint;
        var isMedia = objectType == Constants.ObjectTypes.Media;
        var isMember = objectType == Constants.ObjectTypes.Member;

        Sql<ISqlContext> sql = GetFullSqlForEntityType(isContent, isMedia, isMember, objectType, filter);
        return GetEntities(sql, isContent, isMedia, isMember);
    }

    private IEnumerable<IEntitySlim> PerformGetAll(
        Guid objectType,
        Ordering ordering,
        Action<Sql<ISqlContext>>? filter = null)
    {
        var isContent = objectType == Constants.ObjectTypes.Document ||
                        objectType == Constants.ObjectTypes.DocumentBlueprint;
        var isMedia = objectType == Constants.ObjectTypes.Media;
        var isMember = objectType == Constants.ObjectTypes.Member;

        Sql<ISqlContext> sql = GetFullSqlForEntityType(isContent, isMedia, isMember, objectType, ordering, filter);
        return GetEntities(sql, isContent, isMedia, isMember);
    }

    public IEnumerable<TreeEntityPath> GetAllPaths(Guid objectType, params int[]? ids) =>
        ids?.Any() ?? false
            ? PerformGetAllPaths(objectType, sql => sql.WhereIn<NodeDto>(x => x.NodeId, ids.Distinct()))
            : PerformGetAllPaths(objectType);

    public IEnumerable<TreeEntityPath> GetAllPaths(Guid objectType, params Guid[] keys) =>
        keys.Any()
            ? PerformGetAllPaths(objectType, sql => sql.WhereIn<NodeDto>(x => x.UniqueId, keys.Distinct()))
            : PerformGetAllPaths(objectType);

    private IEnumerable<TreeEntityPath> PerformGetAllPaths(Guid objectType, Action<Sql<ISqlContext>>? filter = null)
    {
        // NodeId is named Id on TreeEntityPath = use an alias
        Sql<ISqlContext> sql = Sql().Select<NodeDto>(x => Alias(x.NodeId, nameof(TreeEntityPath.Id)), x => x.Path)
            .From<NodeDto>().Where<NodeDto>(x => x.NodeObjectType == objectType);
        filter?.Invoke(sql);
        return Database.Fetch<TreeEntityPath>(sql);
    }

    public IEnumerable<IEntitySlim> GetByQuery(IQuery<IUmbracoEntity> query)
    {
        Sql<ISqlContext> sqlClause = GetBase(false, false, false, null);
        var translator = new SqlTranslator<IUmbracoEntity>(sqlClause, query);
        Sql<ISqlContext> sql = translator.Translate();
        sql = AddGroupBy(false, false, false, sql, true);
        List<BaseDto>? dtos = Database.Fetch<BaseDto>(sql);
        return dtos.Select(BuildEntity).ToList();
    }

    public IEnumerable<IEntitySlim> GetByQuery(IQuery<IUmbracoEntity> query, Guid objectType)
    {
        var isContent = objectType == Constants.ObjectTypes.Document ||
                        objectType == Constants.ObjectTypes.DocumentBlueprint;
        var isMedia = objectType == Constants.ObjectTypes.Media;
        var isMember = objectType == Constants.ObjectTypes.Member;

        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, null, new[] { objectType });

        var translator = new SqlTranslator<IUmbracoEntity>(sql, query);
        sql = translator.Translate();
        sql = AddGroupBy(isContent, isMedia, isMember, sql, true);

        return GetEntities(sql, isContent, isMedia, isMember);
    }

    public UmbracoObjectTypes GetObjectType(int id)
    {
        Sql<ISqlContext> sql = Sql().Select<NodeDto>(x => x.NodeObjectType).From<NodeDto>()
            .Where<NodeDto>(x => x.NodeId == id);
        return ObjectTypes.GetUmbracoObjectType(Database.ExecuteScalar<Guid>(sql));
    }

    public UmbracoObjectTypes GetObjectType(Guid key)
    {
        Sql<ISqlContext> sql = Sql().Select<NodeDto>(x => x.NodeObjectType).From<NodeDto>()
            .Where<NodeDto>(x => x.UniqueId == key);
        return ObjectTypes.GetUmbracoObjectType(Database.ExecuteScalar<Guid>(sql));
    }

    public int ReserveId(Guid key)
    {
        NodeDto node;

        Sql<ISqlContext> sql = SqlContext.Sql()
            .Select<NodeDto>()
            .From<NodeDto>()
            .Where<NodeDto>(x => x.UniqueId == key && x.NodeObjectType == Constants.ObjectTypes.IdReservation);

        node = Database.SingleOrDefault<NodeDto>(sql);
        if (node != null)
        {
            throw new InvalidOperationException("An identifier has already been reserved for this Udi.");
        }

        node = new NodeDto
        {
            UniqueId = key,
            Text = "RESERVED.ID",
            NodeObjectType = Constants.ObjectTypes.IdReservation,
            CreateDate = DateTime.Now,
            UserId = null,
            ParentId = -1,
            Level = 1,
            Path = "-1",
            SortOrder = 0,
            Trashed = false
        };
        Database.Insert(node);

        return node.NodeId;
    }

    public bool Exists(Guid key)
    {
        Sql<ISqlContext> sql = Sql().SelectCount().From<NodeDto>().Where<NodeDto>(x => x.UniqueId == key);
        return Database.ExecuteScalar<int>(sql) > 0;
    }

    public bool Exists(IEnumerable<Guid> keys)
    {
        IEnumerable<Guid> distictKeys = keys.Distinct();
        Sql<ISqlContext> sql = Sql().SelectCount().From<NodeDto>().Where<NodeDto>(x => distictKeys.Contains(x.UniqueId));
        return Database.ExecuteScalar<int>(sql) == distictKeys.Count();
    }

    /// <inheritdoc />
    public bool Exists(Guid key, Guid objectType)
    {
        Sql<ISqlContext> sql = Sql()
            .SelectCount()
            .From<NodeDto>()
            .Where<NodeDto>(x => x.UniqueId == key && x.NodeObjectType == objectType);

        return Database.ExecuteScalar<int>(sql) > 0;
    }

    public bool Exists(int id, Guid objectType)
    {
        Sql<ISqlContext> sql = Sql()
            .SelectCount()
            .From<NodeDto>()
            .Where<NodeDto>(x => x.NodeId == id && x.NodeObjectType == objectType);

        return Database.ExecuteScalar<int>(sql) > 0;
    }

    public bool Exists(int id)
    {
        Sql<ISqlContext> sql = Sql().SelectCount().From<NodeDto>().Where<NodeDto>(x => x.NodeId == id);
        return Database.ExecuteScalar<int>(sql) > 0;
    }

    private DocumentEntitySlim BuildVariants(DocumentEntitySlim entity)
        => BuildVariants(new[] { entity }).First();

    private IEnumerable<DocumentEntitySlim> BuildVariants(IEnumerable<DocumentEntitySlim> entities)
    {
        List<DocumentEntitySlim>? v = null;
        var entitiesList = entities.ToList();
        foreach (DocumentEntitySlim e in entitiesList)
        {
            if (e.Variations.VariesByCulture())
            {
                (v ??= new List<DocumentEntitySlim>()).Add(e);
            }
        }

        if (v == null)
        {
            return entitiesList;
        }

        // fetch all variant info dtos
        IEnumerable<VariantInfoDto> dtos = Database.FetchByGroups<VariantInfoDto, int>(
            v.Select(x => x.Id),
            Constants.Sql.MaxParameterCount,
            GetVariantInfos);

        // group by node id (each group contains all languages)
        var xdtos = dtos.GroupBy(x => x.NodeId).ToDictionary(x => x.Key, x => x);

        foreach (DocumentEntitySlim e in v)
        {
            // since we're only iterating on entities that vary, we must have something
            IGrouping<int, VariantInfoDto> edtos = xdtos[e.Id];

            e.CultureNames = edtos.Where(x => x.CultureAvailable).ToDictionary(x => x.IsoCode, x => x.Name);
            e.PublishedCultures = edtos.Where(x => x.CulturePublished).Select(x => x.IsoCode);
            e.EditedCultures = edtos.Where(x => x.CultureAvailable && x.CultureEdited).Select(x => x.IsoCode);
        }

        return entitiesList;
    }

    #endregion

    #region Sql

    protected Sql<ISqlContext> GetVariantInfos(IEnumerable<int> ids) =>
        Sql()
            .Select<NodeDto>(x => x.NodeId)
            .AndSelect<LanguageDto>(x => x.IsoCode)
            .AndSelect<DocumentDto>(
                "doc",
                x => Alias(
                    x.Published,
                    "DocumentPublished"),
                x => Alias(x.Edited, "DocumentEdited"))
            .AndSelect<DocumentCultureVariationDto>(
                "dcv",
                x => Alias(x.Available, "CultureAvailable"),
                x => Alias(x.Published, "CulturePublished"),
                x => Alias(x.Edited, "CultureEdited"),
                x => Alias(x.Name, "Name"))

            // from node x language
            .From<NodeDto>()
            .CrossJoin<LanguageDto>()

            // join to document - always exists - indicates global document published/edited status
            .InnerJoin<DocumentDto>("doc")
            .On<NodeDto, DocumentDto>((node, doc) => node.NodeId == doc.NodeId, aliasRight: "doc")

            // left-join do document variation - matches cultures that are *available* + indicates when *edited*
            .LeftJoin<DocumentCultureVariationDto>("dcv")
            .On<NodeDto, DocumentCultureVariationDto, LanguageDto>(
                (node, dcv, lang) => node.NodeId == dcv.NodeId && lang.Id == dcv.LanguageId, aliasRight: "dcv")

            // for selected nodes
            .WhereIn<NodeDto>(x => x.NodeId, ids)
            .OrderBy<LanguageDto>(x => x.Id);

    // gets the full sql for a given object type and a given unique id
    protected Sql<ISqlContext> GetFullSqlForEntityType(bool isContent, bool isMedia, bool isMember, Guid objectType,
        Guid uniqueId)
    {
        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, objectType, uniqueId);
        return AddGroupBy(isContent, isMedia, isMember, sql, true);
    }

    // gets the full sql for a given object type and a given node id
    protected Sql<ISqlContext> GetFullSqlForEntityType(bool isContent, bool isMedia, bool isMember, Guid objectType,
        int nodeId)
    {
        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, objectType, nodeId);
        return AddGroupBy(isContent, isMedia, isMember, sql, true);
    }

    // gets the full sql for a given object type, with a given filter
    protected Sql<ISqlContext> GetFullSqlForEntityType(bool isContent, bool isMedia, bool isMember, Guid objectType,
        Action<Sql<ISqlContext>>? filter)
    {
        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, filter, new[] { objectType });
        return AddGroupBy(isContent, isMedia, isMember, sql, true);
    }

    protected Sql<ISqlContext> GetFullSqlForEntityType(
        bool isContent,
        bool isMedia,
        bool isMember,
        Guid objectType,
        Ordering ordering,
        Action<Sql<ISqlContext>>? filter)
    {
        Sql<ISqlContext> sql = GetBaseWhere(isContent, isMedia, isMember, false, filter, new[] { objectType });
        AddGroupBy(isContent, isMedia, isMember, sql, false);
        ApplyOrdering(ref sql, ordering);

        return sql;
    }

    protected Sql<ISqlContext> GetBase(bool isContent, bool isMedia, bool isMember, Action<Sql<ISqlContext>>? filter, bool isCount = false)
        => GetBase(isContent, isMedia, isMember, filter, [], isCount);

    // gets the base SELECT + FROM [+ filter] sql
    // always from the 'current' content version
    protected Sql<ISqlContext> GetBase(bool isContent, bool isMedia, bool isMember, Action<Sql<ISqlContext>>? filter, Guid[] objectTypes, bool isCount = false)
    {
        Sql<ISqlContext> sql = Sql();

        if (isCount)
        {
            sql.SelectCount();
        }
        else
        {
            sql
                .Select<NodeDto>(x => x.NodeId, x => x.Trashed, x => x.ParentId, x => x.UserId, x => x.Level,
                    x => x.Path)
                .AndSelect<NodeDto>(x => x.SortOrder, x => x.UniqueId, x => x.Text, x => x.NodeObjectType,
                    x => x.CreateDate);

            if (objectTypes.Length == 0)
            {
                sql.Append(", COUNT(child.id) AS children");
            }
            else
            {
                // The following is safe from SQL injection as we are dealing with GUIDs, not strings.
                // Upper-case is necessary for SQLite, and also works for SQL Server.
                var objectTypesForInClause = string.Join("','",  objectTypes.Select(x => x.ToString().ToUpperInvariant()));
                sql.Append($", SUM(CASE WHEN child.nodeObjectType IN ('{objectTypesForInClause}') THEN 1 ELSE 0 END) AS children");
            }

            if (isContent || isMedia || isMember)
            {
                sql
                    .AndSelect<ContentVersionDto>(x => Alias(x.Id, "versionId"), x => x.VersionDate)
                    .AndSelect<ContentTypeDto>(
                        x => x.Alias,
                        x => x.Icon,
                        x => x.Thumbnail,
                        x => x.ListView,
                        x => x.Variations)
                    .AndSelect<NodeDto>("ContentTypeNode", x => Alias(x.UniqueId, "ContentTypeKey"));
            }

            if (isContent)
            {
                sql
                    .AndSelect<DocumentDto>(x => x.Published, x => x.Edited);
            }

            if (isMedia)
            {
                sql
                    .AndSelect<MediaVersionDto>(x => Alias(x.Path, "MediaPath"));
            }
        }

        sql
            .From<NodeDto>();

        if (isContent || isMedia || isMember)
        {
            sql
                .LeftJoin<ContentVersionDto>()
                .On<NodeDto, ContentVersionDto>((left, right) => left.NodeId == right.NodeId && right.Current)
                .LeftJoin<ContentDto>().On<NodeDto, ContentDto>((left, right) => left.NodeId == right.NodeId)
                .LeftJoin<ContentTypeDto>()
                .On<ContentDto, ContentTypeDto>((left, right) => left.ContentTypeId == right.NodeId)
                .LeftJoin<NodeDto>("ContentTypeNode")
                .On<NodeDto, ContentTypeDto>((left, right) => left.NodeId == right.NodeId, aliasLeft: "ContentTypeNode");
        }

        if (isContent)
        {
            sql
                .LeftJoin<DocumentDto>().On<NodeDto, DocumentDto>((left, right) => left.NodeId == right.NodeId);
        }

        if (isMedia)
        {
            sql
                .LeftJoin<MediaVersionDto>()
                .On<ContentVersionDto, MediaVersionDto>((left, right) => left.Id == right.Id);
        }

        //Any LeftJoin statements need to come last
        if (isCount == false)
        {
            sql
                .LeftJoin<NodeDto>("child")
                .On<NodeDto, NodeDto>((left, right) => left.NodeId == right.ParentId, aliasRight: "child");
        }


        filter?.Invoke(sql);

        return sql;
    }

    // gets the base SELECT + FROM [+ filter] + WHERE sql
    // for a given object type, with a given filter
    protected Sql<ISqlContext> GetBaseWhere(bool isContent, bool isMedia, bool isMember, bool isCount,
        Action<Sql<ISqlContext>>? filter, Guid[] objectTypes)
    {
        Sql<ISqlContext> sql = GetBase(isContent, isMedia, isMember, filter, objectTypes, isCount);
        if (objectTypes.Length > 0)
        {
            sql.WhereIn<NodeDto>(x => x.NodeObjectType, objectTypes);
        }

        return sql;
    }

    // gets the base SELECT + FROM + WHERE sql
    // for a given node id
    protected Sql<ISqlContext> GetBaseWhere(bool isContent, bool isMedia, bool isMember, bool isCount, int id)
    {
        Sql<ISqlContext> sql = GetBase(isContent, isMedia, isMember, null, isCount)
            .Where<NodeDto>(x => x.NodeId == id);
        return AddGroupBy(isContent, isMedia, isMember, sql, true);
    }

    // gets the base SELECT + FROM + WHERE sql
    // for a given unique id
    protected Sql<ISqlContext> GetBaseWhere(bool isContent, bool isMedia, bool isMember, bool isCount, Guid uniqueId)
    {
        Sql<ISqlContext> sql = GetBase(isContent, isMedia, isMember, null, isCount)
            .Where<NodeDto>(x => x.UniqueId == uniqueId);
        return AddGroupBy(isContent, isMedia, isMember, sql, true);
    }

    // gets the base SELECT + FROM + WHERE sql
    // for a given object type and node id
    protected Sql<ISqlContext> GetBaseWhere(bool isContent, bool isMedia, bool isMember, bool isCount, Guid objectType,
        int nodeId) =>
        GetBase(isContent, isMedia, isMember, null, isCount)
            .Where<NodeDto>(x => x.NodeId == nodeId && x.NodeObjectType == objectType);

    // gets the base SELECT + FROM + WHERE sql
    // for a given object type and unique id
    protected Sql<ISqlContext> GetBaseWhere(bool isContent, bool isMedia, bool isMember, bool isCount, Guid objectType,
        Guid uniqueId) =>
        GetBase(isContent, isMedia, isMember, null, isCount)
            .Where<NodeDto>(x => x.UniqueId == uniqueId && x.NodeObjectType == objectType);

    // gets the GROUP BY / ORDER BY sql
    // required in order to count children
    protected Sql<ISqlContext> AddGroupBy(bool isContent, bool isMedia, bool isMember, Sql<ISqlContext> sql,
        bool defaultSort)
    {
        sql
            .GroupBy<NodeDto>(x => x.NodeId, x => x.Trashed, x => x.ParentId, x => x.UserId, x => x.Level, x => x.Path)
            .AndBy<NodeDto>(x => x.SortOrder, x => x.UniqueId, x => x.Text, x => x.NodeObjectType, x => x.CreateDate);

        if (isContent)
        {
            sql
                .AndBy<DocumentDto>(x => x.Published, x => x.Edited);
        }

        if (isMedia)
        {
            sql
                .AndBy<MediaVersionDto>(x => Alias(x.Path, "MediaPath"));
        }


        if (isContent || isMedia || isMember)
        {
            sql
                .AndBy<ContentVersionDto>(x => x.Id, x => x.VersionDate)
                .AndBy<ContentTypeDto>(
                    x => x.Alias,
                    x => x.Icon,
                    x => x.Thumbnail,
                    x => x.ListView,
                    x => x.Variations)
                .AndBy<NodeDto>("ContentTypeNode", x => x.UniqueId);
        }

        if (defaultSort)
        {
            sql.OrderBy<NodeDto>(x => x.SortOrder);
        }

        return sql;
    }

    private void ApplyOrdering(ref Sql<ISqlContext> sql, Ordering ordering)
    {
        if (sql == null)
        {
            throw new ArgumentNullException(nameof(sql));
        }

        if (ordering == null)
        {
            throw new ArgumentNullException(nameof(ordering));
        }

        // TODO: although the default ordering string works for name, it wont work for others without a table or an alias of some sort
        // As more things are attempted to be sorted we'll prob have to add more expressions here
        string orderBy;

        Ordering? runner = ordering;

        do
        {

            switch (runner.OrderBy?.ToUpperInvariant())
            {
                case "NODEOBJECTTYPE":
                    orderBy = $"UPPER({SqlSyntax.GetQuotedColumn(NodeDto.TableName, "nodeObjectType")})";
                    break;
                case "PATH":
                    orderBy = SqlSyntax.GetQuotedColumn(NodeDto.TableName, "path");
                    break;

                default:
                    orderBy = runner.OrderBy ?? string.Empty;
                    break;
            }

            if (runner.Direction == Direction.Ascending)
            {
                sql.OrderBy(orderBy);
            }
            else
            {
                sql.OrderByDescending(orderBy);
            }

            runner = runner.Next;
        }
        while (runner is not null);


    }

    #endregion

    #region Classes

    /// <summary>
    ///     The DTO used to fetch results for a generic content item which could be either a document, media or a member
    /// </summary>
    private sealed class GenericContentEntityDto : DocumentEntityDto
    {
        public string? MediaPath { get; set; }
    }

    /// <summary>
    ///     The DTO used to fetch results for a document item with its variation info
    /// </summary>
    private class DocumentEntityDto : BaseDto
    {
        public ContentVariation Variations { get; set; }

        public bool Published { get; set; }
        public bool Edited { get; set; }
    }

    /// <summary>
    ///     The DTO used to fetch results for a media item with its media path info
    /// </summary>
    private sealed class MediaEntityDto : BaseDto
    {
        public string? MediaPath { get; set; }
    }

    /// <summary>
    ///     The DTO used to fetch results for a member item
    /// </summary>
    private sealed class MemberEntityDto : BaseDto
    {
    }

    public class VariantInfoDto
    {
        public int NodeId { get; set; }
        public string IsoCode { get; set; } = null!;
        public string Name { get; set; } = null!;
        public bool DocumentPublished { get; set; }
        public bool DocumentEdited { get; set; }

        public bool CultureAvailable { get; set; }
        public bool CulturePublished { get; set; }
        public bool CultureEdited { get; set; }
    }

    // ReSharper disable once ClassNeverInstantiated.Local
    /// <summary>
    ///     the DTO corresponding to fields selected by GetBase
    /// </summary>
    private class BaseDto
    {
        // ReSharper disable UnusedAutoPropertyAccessor.Local
        // ReSharper disable UnusedMember.Local
        public int NodeId { get; set; }
        public bool Trashed { get; set; }
        public int ParentId { get; set; }
        public int? UserId { get; set; }
        public int Level { get; set; }
        public string Path { get; } = null!;
        public int SortOrder { get; set; }
        public Guid UniqueId { get; set; }
        public string? Text { get; set; }
        public Guid NodeObjectType { get; set; }
        public DateTime CreateDate { get; set; }
        public DateTime VersionDate { get; set; }
        public int Children { get; set; }
        public int VersionId { get; set; }
        public string Alias { get; } = null!;
        public string? Icon { get; set; }
        public string? Thumbnail { get; set; }
        public bool IsContainer { get; set; }

        public Guid ContentTypeKey { get; set; }

        public Guid? ListView { get; set; }

        // ReSharper restore UnusedAutoPropertyAccessor.Local
        // ReSharper restore UnusedMember.Local
    }

    #endregion

    #region Factory

    private EntitySlim BuildEntity(BaseDto dto)
    {
        if (dto.NodeObjectType == Constants.ObjectTypes.Document
            || dto.NodeObjectType == Constants.ObjectTypes.DocumentBlueprint)
        {
            return BuildDocumentEntity(dto);
        }

        if (dto.NodeObjectType == Constants.ObjectTypes.Media)
        {
            return BuildMediaEntity(dto);
        }

        if (dto.NodeObjectType == Constants.ObjectTypes.Member)
        {
            return BuildMemberEntity(dto);
        }

        // EntitySlim does not track changes
        var entity = new EntitySlim();
        BuildEntity(entity, dto);
        return entity;
    }

    private static void BuildEntity(EntitySlim entity, BaseDto dto)
    {
        entity.Trashed = dto.Trashed;
        entity.CreateDate = dto.CreateDate;
        entity.UpdateDate = dto.VersionDate;
        entity.CreatorId = dto.UserId ?? Constants.Security.UnknownUserId;
        entity.Id = dto.NodeId;
        entity.Key = dto.UniqueId;
        entity.Level = dto.Level;
        entity.Name = dto.Text;
        entity.NodeObjectType = dto.NodeObjectType;
        entity.ParentId = dto.ParentId;
        entity.Path = dto.Path;
        entity.SortOrder = dto.SortOrder;
        entity.HasChildren = dto.Children > 0;
        entity.IsContainer = dto.IsContainer;
    }

    private static void BuildContentEntity(ContentEntitySlim entity, BaseDto dto)
    {
        BuildEntity(entity, dto);
        entity.ContentTypeAlias = dto.Alias;
        entity.ContentTypeIcon = dto.Icon;
        entity.ContentTypeThumbnail = dto.Thumbnail;
        entity.ContentTypeKey = dto.ContentTypeKey;
        entity.ListViewKey = dto.ListView;
    }

    private static MediaEntitySlim BuildMediaEntity(BaseDto dto)
    {
        // EntitySlim does not track changes
        var entity = new MediaEntitySlim();
        BuildContentEntity(entity, dto);

        // fill in the media info
        if (dto is MediaEntityDto mediaEntityDto)
        {
            entity.MediaPath = mediaEntityDto.MediaPath;
        }
        else if (dto is GenericContentEntityDto genericContentEntityDto)
        {
            entity.MediaPath = genericContentEntityDto.MediaPath;
        }

        return entity;
    }

    private static DocumentEntitySlim BuildDocumentEntity(BaseDto dto)
    {
        // EntitySlim does not track changes
        var entity = new DocumentEntitySlim();
        BuildContentEntity(entity, dto);

        if (dto is DocumentEntityDto contentDto)
        {
            // fill in the invariant info
            entity.Edited = contentDto.Edited;
            entity.Published = contentDto.Published;
            entity.Variations = contentDto.Variations;
        }

        return entity;
    }

    private static MemberEntitySlim BuildMemberEntity(BaseDto dto)
    {
        // EntitySlim does not track changes
        var entity = new MemberEntitySlim();
        BuildEntity(entity, dto);

        entity.ContentTypeAlias = dto.Alias;
        entity.ContentTypeIcon = dto.Icon;
        entity.ContentTypeThumbnail = dto.Thumbnail;

        return entity;
    }

    #endregion
}