// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using MongoDB.Bson.Serialization.Attributes;
using NodaTime;
using Squidex.Domain.Apps.Core.Contents;
using Squidex.Domain.Apps.Core.ExtractReferenceIds;
using Squidex.Domain.Apps.Entities.Contents;
using Squidex.Domain.Apps.Entities.Contents.DomainObject;
using Squidex.Infrastructure;
using Squidex.Infrastructure.MongoDb;
using Squidex.Infrastructure.Reflection;
using Squidex.Infrastructure.States;

namespace Squidex.Domain.Apps.Entities.MongoDb.Contents
{
    [BsonIgnoreExtraElements]
    public sealed class MongoContentEntity : IContentEntity, IVersionedEntity<DomainId>
    {
        [BsonId]
        [BsonElement("_id")]
        public DomainId DocumentId { get; set; }

        [BsonRequired]
        [BsonElement("_ai")]
        public DomainId IndexedAppId { get; set; }

        [BsonRequired]
        [BsonElement("_si")]
        public DomainId IndexedSchemaId { get; set; }

        [BsonRequired]
        [BsonElement("ai")]
        public NamedId<DomainId> AppId { get; set; }

        [BsonRequired]
        [BsonElement("si")]
        public NamedId<DomainId> SchemaId { get; set; }

        [BsonRequired]
        [BsonElement("rf")]
        public HashSet<DomainId>? ReferencedIds { get; set; }

        [BsonRequired]
        [BsonElement("id")]
        public DomainId Id { get; set; }

        [BsonRequired]
        [BsonElement("ss")]
        public Status Status { get; set; }

        [BsonIgnoreIfNull]
        [BsonElement("ns")]
        public Status? NewStatus { get; set; }

        [BsonIgnoreIfNull]
        [BsonElement("do")]
        [BsonJson]
        public ContentData Data { get; set; }

        [BsonIgnoreIfNull]
        [BsonElement("dd")]
        [BsonJson]
        public ContentData? DraftData { get; set; }

        [BsonIgnoreIfNull]
        [BsonElement("sa")]
        public Instant? ScheduledAt { get; set; }

        [BsonRequired]
        [BsonElement("ct")]
        public Instant Created { get; set; }

        [BsonRequired]
        [BsonElement("mt")]
        public Instant LastModified { get; set; }

        [BsonRequired]
        [BsonElement("vs")]
        public long Version { get; set; }

        [BsonIgnoreIfDefault]
        [BsonElement("dl")]
        public bool IsDeleted { get; set; }

        [BsonIgnoreIfDefault]
        [BsonElement("is")]
        public bool IsSnapshot { get; set; }

        [BsonIgnoreIfDefault]
        [BsonElement("sj")]
        public ScheduleJob? ScheduleJob { get; set; }

        [BsonRequired]
        [BsonElement("cb")]
        public RefToken CreatedBy { get; set; }

        [BsonRequired]
        [BsonElement("mb")]
        public RefToken LastModifiedBy { get; set; }

        public DomainId UniqueId
        {
            get => DocumentId;
        }

        public ContentDomainObject.State ToState()
        {
            var state = SimpleMapper.Map(this, new ContentDomainObject.State());

            if (DraftData != null && NewStatus.HasValue)
            {
                state.NewVersion = new ContentVersion(NewStatus.Value, Data);
                state.CurrentVersion = new ContentVersion(Status, DraftData);
            }
            else
            {
                state.NewVersion = null;
                state.CurrentVersion = new ContentVersion(Status, Data);
            }

            return state;
        }

        public static async Task<MongoContentEntity> CreatePublishedAsync(SnapshotWriteJob<ContentDomainObject.State> job, IAppProvider appProvider)
        {
            var entity = await CreateContentAsync(job.Value.CurrentVersion.Data, job, appProvider);

            entity.ScheduledAt = null;
            entity.ScheduleJob = null;
            entity.NewStatus = null;

            return entity;
        }

        public static async Task<MongoContentEntity> CreateDraftAsync(SnapshotWriteJob<ContentDomainObject.State> job, IAppProvider appProvider)
        {
            var entity = await CreateContentAsync(job.Value.Data, job, appProvider);

            entity.ScheduledAt = job.Value.ScheduleJob?.DueTime;
            entity.ScheduleJob = job.Value.ScheduleJob;
            entity.NewStatus = job.Value.NewStatus;
            entity.DraftData = job.Value.NewVersion != null ? job.Value.CurrentVersion.Data : null;
            entity.IsSnapshot = true;

            return entity;
        }

        private static async Task<MongoContentEntity> CreateContentAsync(ContentData data, SnapshotWriteJob<ContentDomainObject.State> job, IAppProvider appProvider)
        {
            var entity = SimpleMapper.Map(job.Value, new MongoContentEntity());

            entity.Data = data;
            entity.DocumentId = job.Value.UniqueId;
            entity.IndexedAppId = job.Value.AppId.Id;
            entity.IndexedSchemaId = job.Value.SchemaId.Id;
            entity.ReferencedIds ??= new HashSet<DomainId>();
            entity.Version = job.NewVersion;

            if (data.CanHaveReference())
            {
                var schema = await appProvider.GetSchemaAsync(job.Value.AppId.Id, job.Value.SchemaId.Id, true);

                if (schema != null)
                {
                    var components = await appProvider.GetComponentsAsync(schema);

                    entity.Data.AddReferencedIds(schema.SchemaDef, entity.ReferencedIds, components);
                }
            }

            return entity;
        }
    }
}