using System.Linq.Expressions;
using Elsa.Common.Entities;
using Elsa.Common.Models;
using Elsa.Common.Multitenancy;
using Elsa.Persistence.EFCore.Extensions;
using Elsa.Extensions;
using JetBrains.Annotations;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Open.Linq.AsyncExtensions;

namespace Elsa.Persistence.EFCore;

/// <summary>
/// A generic repository class around EF Core for accessing entities.
/// </summary>
/// <typeparam name="TDbContext">The type of the database context.</typeparam>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
[PublicAPI]
public class Store<TDbContext, TEntity>(IDbContextFactory<TDbContext> dbContextFactory, IServiceProvider serviceProvider) where TDbContext : DbContext where TEntity : class, new()
{
    // ReSharper disable once StaticMemberInGenericType
    // Justification: This is a static member that is used to ensure that only one thread can access the database for TEntity at a time.
    private static readonly SemaphoreSlim Semaphore = new(1, 1);

    /// <summary>
    /// Creates a new instance of the database context.
    /// </summary>
    /// <param name="cancellationToken">The cancellation token.</param>
    /// <returns>The database context.</returns>
    public async Task<TDbContext> CreateDbContextAsync(CancellationToken cancellationToken = default) => await dbContextFactory.CreateDbContextAsync(cancellationToken);

    /// <summary>
    /// Adds the specified entity.
    /// </summary>
    /// <param name="entity">The entity to add.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task AddAsync(TEntity entity, CancellationToken cancellationToken = default)
    {
        await AddAsync(entity, null, cancellationToken);
    }

    /// <summary>
    /// Adds the specified entity.
    /// </summary>
    /// <param name="entity">The entity to add.</param>
    /// <param name="onAdding">The callback to invoke before adding the entity.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task AddAsync(TEntity entity, Func<TDbContext, TEntity, CancellationToken, ValueTask>? onAdding, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);

        if (onAdding != null)
            await onAdding(dbContext, entity, cancellationToken);

        var set = dbContext.Set<TEntity>();
        await set.AddAsync(entity, cancellationToken);
        await dbContext.SaveChangesAsync(cancellationToken);
    }

    /// <summary>
    /// Adds the specified entities.
    /// </summary>
    /// <param name="entities">The entities to save.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task AddManyAsync(
        IEnumerable<TEntity> entities,
        CancellationToken cancellationToken = default)
    {
        await AddManyAsync(entities, null, cancellationToken);
    }

    /// <summary>
    /// Adds the specified entities.
    /// </summary>
    /// <param name="entities">The entities to save.</param>
    /// <param name="onSaving">The callback to invoke before saving the entity.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task AddManyAsync(
        IEnumerable<TEntity> entities,
        Func<TDbContext, TEntity, CancellationToken, ValueTask>? onSaving = null,
        CancellationToken cancellationToken = default)
    {
        var entityList = entities.ToList();

        if (entityList.Count == 0)
            return;

        await using var dbContext = await CreateDbContextAsync(cancellationToken);

        if (onSaving != null)
        {
            var savingTasks = entityList.Select(entity => onSaving(dbContext, entity, cancellationToken).AsTask()).ToList();
            await Task.WhenAll(savingTasks);
        }

        await dbContext.BulkInsertAsync(entityList, cancellationToken);
    }

    /// <summary>
    /// Saves the entity.
    /// </summary>
    /// <param name="entity">The entity to save.</param>
    /// <param name="keySelector">The key selector to get the primary key property.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task SaveAsync(TEntity entity, Expression<Func<TEntity, string>> keySelector, CancellationToken cancellationToken = default) => await SaveAsync(entity, keySelector, null, cancellationToken);

    /// <summary>
    /// Saves the entity.
    /// </summary>
    /// <param name="entity">The entity to save.</param>
    /// <param name="keySelector">The key selector to get the primary key property.</param>
    /// <param name="onSaving">The callback to invoke before saving the entity.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task SaveAsync(TEntity entity, Expression<Func<TEntity, string>> keySelector, Func<TDbContext, TEntity, CancellationToken, ValueTask>? onSaving, CancellationToken cancellationToken = default)
    {
        await Semaphore.WaitAsync(cancellationToken); // Asynchronous wait

        try
        {
            await using var dbContext = await CreateDbContextAsync(cancellationToken);

            if (onSaving != null)
                await onSaving(dbContext, entity, cancellationToken);

            var set = dbContext.Set<TEntity>();
            var lambda = keySelector.BuildEqualsExpression(entity);
            var exists = await set.AnyAsync(lambda, cancellationToken);
            set.Entry(entity).State = exists ? EntityState.Modified : EntityState.Added;
            await dbContext.SaveChangesAsync(cancellationToken);
        }
        catch (Exception ex)
        {
            var handler = serviceProvider.GetService<IDbExceptionHandler>();

            if (handler != null)
            {
                var context = new DbUpdateExceptionContext(ex, cancellationToken);
                await handler.HandleAsync(context);
            }

            throw;
        }
        finally
        {
            Semaphore.Release();
        }
    }

    /// <summary>
    /// Saves the specified entities.
    /// </summary>
    /// <param name="entities">The entities to save.</param>
    /// <param name="keySelector">The key selector to get the primary key property.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task SaveManyAsync(IEnumerable<TEntity> entities, Expression<Func<TEntity, string>> keySelector, CancellationToken cancellationToken = default) => await SaveManyAsync(entities, keySelector, null, cancellationToken);

    /// <summary>
    /// Saves the specified entities.
    /// </summary>
    /// <param name="entities">The entities to save.</param>
    /// <param name="keySelector">The key selector to get the primary key property.</param>
    /// <param name="onSaving">The callback to invoke before saving the entity.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task SaveManyAsync(
        IEnumerable<TEntity> entities,
        Expression<Func<TEntity, string>> keySelector,
        Func<TDbContext, TEntity, CancellationToken, ValueTask>? onSaving = null,
        CancellationToken cancellationToken = default)
    {
        var entityList = entities.ToList();

        if (entityList.Count == 0)
            return;

        await using var dbContext = await CreateDbContextAsync(cancellationToken);

        if (onSaving != null)
        {
            var savingTasks = entityList.Select(entity => onSaving(dbContext, entity, cancellationToken).AsTask()).ToList();
            await Task.WhenAll(savingTasks);
        }

        // When doing a custom SQL query (Bulk Upsert), none of the installed query filters will be applied. Hence, we are assigning the current tenant ID explicitly.
        var tenantId = serviceProvider.GetRequiredService<ITenantAccessor>().Tenant?.Id.NullIfEmpty();
        foreach (var entity in entityList)
        {
            if (entity is Entity entityWithTenant)
                entityWithTenant.TenantId = tenantId;
        }

        try
        {
            await dbContext.BulkUpsertAsync(entityList, keySelector, cancellationToken);
        }
        catch (Exception ex)
        {
            var handler = serviceProvider.GetService<IDbExceptionHandler>();

            if (handler != null)
            {
                var context = new DbUpdateExceptionContext(ex, cancellationToken);
                await handler.HandleAsync(context);
            }

            throw;
        }
    }

    /// <summary>
    /// Updates the entity.
    /// </summary>
    /// <param name="entity">The entity to update.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public Task UpdateAsync(TEntity entity, CancellationToken cancellationToken = default)
    {
        return UpdateAsync(entity, null, cancellationToken);
    }

    /// <summary>
    /// Updates the entity.
    /// </summary>
    /// <param name="entity">The entity to update.</param>
    /// <param name="onSaving">The callback to invoke before saving the entity.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task UpdateAsync(TEntity entity, Func<TDbContext, TEntity, CancellationToken, ValueTask>? onSaving, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);

        if (onSaving != null)
            await onSaving(dbContext, entity, cancellationToken);

        var set = dbContext.Set<TEntity>();
        set.Entry(entity).State = EntityState.Modified;
        await dbContext.SaveChangesAsync(cancellationToken);
    }

    /// <summary>
    /// Updates specific properties of an entity in the database.
    /// </summary>
    /// <param name="entity">The entity to update.</param>
    /// <param name="properties">An array of expressions indicating the properties to update.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public async Task UpdatePartialAsync(TEntity entity, Expression<Func<TEntity, object>>[] properties, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        dbContext.Attach(entity);

        foreach (var property in properties)
            dbContext.Entry(entity).Property(property).IsModified = true;

        await dbContext.SaveChangesAsync(cancellationToken);
    }

    /// <summary>
    /// Finds the entity matching the specified predicate.
    /// </summary>
    /// <param name="predicate">The predicate to use.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    /// <returns>The entity if found, otherwise <c>null</c>.</returns>
    public async Task<TEntity?> FindAsync(Expression<Func<TEntity, bool>> predicate, CancellationToken cancellationToken = default) => await FindAsync(predicate, null, cancellationToken);

    /// <summary>
    /// Finds the entity matching the specified predicate.
    /// </summary>
    /// <param name="predicate">The predicate to use.</param>
    /// <param name="onLoading">A callback to run after the entity is loaded</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    /// <returns></returns>
    public async Task<TEntity?> FindAsync(Expression<Func<TEntity, bool>> predicate, Func<TDbContext, TEntity?, TEntity?>? onLoading = null, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var entity = await set.FirstOrDefaultAsync(predicate, cancellationToken);

        if (entity == null)
            return null;

        if (onLoading != null)
            entity = onLoading.Invoke(dbContext, entity);

        return entity;
    }

    /// <summary>
    /// Finds a single entity using a query
    /// </summary>
    /// <param name="query">The query to use</param>
    /// <param name="onLoading">A callback to run after the entity is loaded</param>
    /// <param name="cancellationToken">The cancellation token</param>
    /// <returns>The entity if found, otherwise <c>null</c></returns>
    public async Task<TEntity?> FindAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Func<TDbContext, TEntity?, CancellationToken, ValueTask>? onLoading = null, CancellationToken cancellationToken = default)
    {
        return await FindAsync(query, onLoading, false, cancellationToken);
    }

    /// <summary>
    /// Finds a single entity using a query
    /// </summary>
    /// <param name="query">The query to use</param>
    /// <param name="onLoading">A callback to run after the entity is loaded</param>
    /// <param name="tenantAgnostic">Define is the request should be tenant agnostic or not</param>
    /// <param name="cancellationToken">The cancellation token</param>
    /// <returns>The entity if found, otherwise <c>null</c></returns>
    public async Task<TEntity?> FindAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Func<TDbContext, TEntity?, CancellationToken, ValueTask>? onLoading = null, bool tenantAgnostic = false, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, onLoading, tenantAgnostic, cancellationToken).FirstOrDefault();
    }

    /// <summary>
    /// Finds a single entity using a query
    /// </summary>
    /// <param name="query">The query to use</param>
    /// <param name="cancellationToken">The cancellation token</param>
    /// <returns>The entity if found, otherwise <c>null</c></returns>
    public async Task<TEntity?> FindAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken = default)
    {
        return await FindAsync(query, false, cancellationToken);
    }

    /// <summary>
    /// Finds a single entity using a query
    /// </summary>
    /// <param name="query">The query to use</param>
    /// <param name="tenantAgnostic">Define is the request should be tenant agnostic or not</param>
    /// <param name="cancellationToken">The cancellation token</param>
    /// <returns>The entity if found, otherwise <c>null</c></returns>
    public async Task<TEntity?> FindAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, bool tenantAgnostic = false, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, tenantAgnostic, cancellationToken).FirstOrDefault();
    }

    /// <summary>
    /// Finds a list of entities using a query
    /// </summary>
    public async Task<IEnumerable<TEntity>> FindManyAsync(Expression<Func<TEntity, bool>> predicate, CancellationToken cancellationToken = default) => await FindManyAsync(predicate, null, cancellationToken);

    /// <summary>
    /// Finds a list of entities using a query
    /// </summary>
    public async Task<IEnumerable<TEntity>> FindManyAsync(Expression<Func<TEntity, bool>> predicate, Action<TDbContext, TEntity?>? onLoading = null, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var entities = await set.Where(predicate).ToListAsync(cancellationToken);

        if (onLoading != null)
            foreach (var entity in entities)
                onLoading(dbContext, entity);

        return entities;
    }

    /// <summary>
    /// Finds a list of entities using a query
    /// </summary>
    public async Task<Page<TEntity>> FindManyAsync<TKey>(
        Expression<Func<TEntity, bool>> predicate,
        Expression<Func<TEntity, TKey>> orderBy,
        OrderDirection orderDirection = OrderDirection.Ascending,
        PageArgs? pageArgs = null,
        CancellationToken cancellationToken = default) =>
        await FindManyAsync(predicate, orderBy, orderDirection, pageArgs, null, cancellationToken);

    /// <summary>
    /// Returns a list of entities using a query
    /// </summary>
    public async Task<Page<TEntity>> FindManyAsync<TKey>(
        Expression<Func<TEntity, bool>>? predicate,
        Expression<Func<TEntity, TKey>>? orderBy,
        OrderDirection orderDirection = OrderDirection.Ascending,
        PageArgs? pageArgs = null,
        Func<TDbContext, TEntity?, TEntity?>? onLoading = null,
        CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();

        if (predicate != null)
            set = set.Where(predicate);

        if (orderBy != null)
            set = orderDirection switch
            {
                OrderDirection.Ascending => set.OrderBy(orderBy),
                OrderDirection.Descending => set.OrderByDescending(orderBy),
                _ => set.OrderBy(orderBy)
            };

        var page = await set.PaginateAsync(pageArgs);

        if (onLoading != null)
            page = page with
            {
                Items = page.Items.Select(x => onLoading(dbContext, x)!).ToList()
            };

        return page;
    }

    public Task<IEnumerable<TEntity>> ListAsync(CancellationToken cancellationToken = default)
    {
        return ListAsync(null, cancellationToken);
    }

    public async Task<IEnumerable<TEntity>> ListAsync(Action<TDbContext, TEntity?>? onLoading = null, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var entities = await set.ToListAsync(cancellationToken);

        if (onLoading != null)
            foreach (var entity in entities)
                onLoading(dbContext, entity);

        return entities;
    }

    /// <summary>
    /// Finds a single entity using a query.
    /// </summary>
    /// <returns>True if the entity was found, otherwise false.</returns>
    public async Task<bool> DeleteAsync(TEntity entity, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>();
        set.Attach(entity).State = EntityState.Deleted;
        return await dbContext.SaveChangesAsync(cancellationToken) == 1;
    }

    /// <summary>
    /// Deletes entities using a predicate.
    /// </summary>
    /// <returns>The number of entities deleted.</returns>
    public async Task<long> DeleteWhereAsync(Expression<Func<TEntity, bool>> predicate, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        return await set.Where(predicate).ExecuteDeleteAsync(cancellationToken);
    }

    /// <summary>
    /// Deletes entities using a query.
    /// </summary>
    /// <returns>The number of entities deleted.</returns>
    public async Task<long> DeleteWhereAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var queryable = query(set.AsQueryable());
        return await queryable.ExecuteDeleteAsync(cancellationToken);
    }

    /// <summary>
    /// Queries the database using a query.
    /// </summary>
    public async Task<IEnumerable<TEntity>> QueryAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, null, false, cancellationToken);
    }

    /// <summary>
    /// Queries the database using a query.
    /// </summary>
    public async Task<IEnumerable<TEntity>> QueryAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, bool tenantAgnostic, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, null, tenantAgnostic, cancellationToken);
    }

    /// <summary>
    /// Queries the database using a query and a selector.
    /// </summary>
    public async Task<IEnumerable<TEntity>> QueryAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Func<TDbContext, TEntity?, CancellationToken, ValueTask>? onLoading = null, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, onLoading, false, cancellationToken);
    }

    /// <summary>
    /// Queries the database using a query and a selector.
    /// </summary>
    public async Task<IEnumerable<TEntity>> QueryAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Func<TDbContext, TEntity?, CancellationToken, ValueTask>? onLoading = null, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var asNoTracking = onLoading == null;
        var set = asNoTracking ? dbContext.Set<TEntity>().AsNoTracking() : dbContext.Set<TEntity>();
        var queryable = query(set.AsQueryable());

        if (ignoreQueryFilters)
            queryable = queryable.IgnoreQueryFilters();

        var entities = await queryable.ToListAsync(cancellationToken);

        if (onLoading != null)
        {
            var loadingTasks = entities.Select(entity => onLoading(dbContext, entity, cancellationToken).AsTask()).ToList();
            await Task.WhenAll(loadingTasks);
        }

        return entities;
    }

    /// <summary>
    /// Queries the database using a query and a selector.
    /// </summary>
    public async Task<IEnumerable<TResult>> QueryAsync<TResult>(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Expression<Func<TEntity, TResult>> selector, CancellationToken cancellationToken = default)
    {
        return await QueryAsync(query, selector, false, cancellationToken);
    }

    /// <summary>
    /// Queries the database using a query and a selector.
    /// </summary>
    public async Task<IEnumerable<TResult>> QueryAsync<TResult>(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, Expression<Func<TEntity, TResult>> selector, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var queryable = query(set.AsQueryable());

        if (ignoreQueryFilters)
            queryable = queryable.IgnoreQueryFilters();

        queryable = query(queryable);
        return await queryable.Select(selector).ToListAsync(cancellationToken);
    }

    /// <summary>
    /// Counts the number of entities matching a query.
    /// </summary>
    public async Task<long> CountAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken = default)
    {
        return await CountAsync(query, false, cancellationToken);
    }

    /// <summary>
    /// Counts the number of entities matching a query.
    /// </summary>
    public async Task<long> CountAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        var queryable = query(set.AsQueryable());

        if (ignoreQueryFilters)
            queryable = queryable.IgnoreQueryFilters();

        queryable = query(queryable);
        return await queryable.LongCountAsync(cancellationToken: cancellationToken);
    }

    /// <summary>
    /// Checks if any entities exist.
    /// </summary>
    public async Task<bool> AnyAsync(Expression<Func<TEntity, bool>> predicate, CancellationToken cancellationToken = default)
    {
        return await AnyAsync(predicate, false, cancellationToken);
    }

    /// <summary>
    /// Checks if any entities exist.
    /// </summary>
    public async Task<bool> AnyAsync(Expression<Func<TEntity, bool>> predicate, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var set = dbContext.Set<TEntity>().AsNoTracking();
        return await set.AnyAsync(predicate, cancellationToken);
    }

    /// <summary>
    /// Counts the number of entities matching a predicate.
    /// </summary>
    /// <param name="predicate">The predicate.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task<long> CountAsync(Expression<Func<TEntity, bool>> predicate, CancellationToken cancellationToken = default)
    {
        return await CountAsync(predicate, false, cancellationToken);
    }

    /// <summary>
    /// Counts the number of entities matching a predicate.
    /// </summary>
    /// <param name="predicate">The predicate.</param>
    /// <param name="ignoreQueryFilters">Whether to ignore query filters.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task<long> CountAsync(Expression<Func<TEntity, bool>> predicate, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var queryable = dbContext.Set<TEntity>().AsNoTracking();

        if (ignoreQueryFilters)
            queryable = queryable.IgnoreQueryFilters();

        return await queryable.CountAsync(predicate, cancellationToken);
    }

    /// <summary>
    /// Counts the distinct number of entities matching a predicate.
    /// </summary>
    /// <param name="predicate">The predicate.</param>
    /// <param name="propertySelector">The property selector to distinct by.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task<long> CountAsync<TProperty>(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, TProperty>> propertySelector, CancellationToken cancellationToken = default)
    {
        return await CountAsync(predicate, propertySelector, false, cancellationToken);
    }

    /// <summary>
    /// Counts the distinct number of entities matching a predicate.
    /// </summary>
    /// <param name="predicate">The predicate.</param>
    /// <param name="propertySelector">The property selector to distinct by.</param>
    /// <param name="ignoreQueryFilters">Whether to ignore query filters.</param>
    /// <param name="cancellationToken">The cancellation token.</param>
    public async Task<long> CountAsync<TProperty>(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, TProperty>> propertySelector, bool ignoreQueryFilters = false, CancellationToken cancellationToken = default)
    {
        await using var dbContext = await CreateDbContextAsync(cancellationToken);
        var queryable = dbContext.Set<TEntity>().AsNoTracking();

        if (ignoreQueryFilters)
            queryable = queryable.IgnoreQueryFilters();

        return await queryable
            .Where(predicate)
            .Select(propertySelector)
            .Distinct()
            .CountAsync(cancellationToken);
    }
}