using Microsoft.EntityFrameworkCore;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
using ZB.MOM.WW.OtOpcUa.Configuration.Enums;

namespace ZB.MOM.WW.OtOpcUa.Configuration;

/// <summary>
///     Central config DB context. Schema matches <c>docs/v2/config-db-schema.md</c> exactly —
///     any divergence is a defect caught by the SchemaComplianceTests introspection check.
/// </summary>
public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbContext> options)
    : DbContext(options)
{
    public DbSet<ServerCluster> ServerClusters => Set<ServerCluster>();
    public DbSet<ClusterNode> ClusterNodes => Set<ClusterNode>();
    public DbSet<ClusterNodeCredential> ClusterNodeCredentials => Set<ClusterNodeCredential>();
    public DbSet<ConfigGeneration> ConfigGenerations => Set<ConfigGeneration>();
    public DbSet<Namespace> Namespaces => Set<Namespace>();
    public DbSet<UnsArea> UnsAreas => Set<UnsArea>();
    public DbSet<UnsLine> UnsLines => Set<UnsLine>();
    public DbSet<DriverInstance> DriverInstances => Set<DriverInstance>();
    public DbSet<Device> Devices => Set<Device>();
    public DbSet<Equipment> Equipment => Set<Equipment>();
    public DbSet<Tag> Tags => Set<Tag>();
    public DbSet<PollGroup> PollGroups => Set<PollGroup>();
    public DbSet<NodeAcl> NodeAcls => Set<NodeAcl>();
    public DbSet<ClusterNodeGenerationState> ClusterNodeGenerationStates => Set<ClusterNodeGenerationState>();
    public DbSet<ConfigAuditLog> ConfigAuditLogs => Set<ConfigAuditLog>();
    public DbSet<ExternalIdReservation> ExternalIdReservations => Set<ExternalIdReservation>();
    public DbSet<DriverHostStatus> DriverHostStatuses => Set<DriverHostStatus>();
    public DbSet<DriverInstanceResilienceStatus> DriverInstanceResilienceStatuses => Set<DriverInstanceResilienceStatus>();
    public DbSet<LdapGroupRoleMapping> LdapGroupRoleMappings => Set<LdapGroupRoleMapping>();
    public DbSet<EquipmentImportBatch> EquipmentImportBatches => Set<EquipmentImportBatch>();
    public DbSet<EquipmentImportRow> EquipmentImportRows => Set<EquipmentImportRow>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        ConfigureServerCluster(modelBuilder);
        ConfigureClusterNode(modelBuilder);
        ConfigureClusterNodeCredential(modelBuilder);
        ConfigureConfigGeneration(modelBuilder);
        ConfigureNamespace(modelBuilder);
        ConfigureUnsArea(modelBuilder);
        ConfigureUnsLine(modelBuilder);
        ConfigureDriverInstance(modelBuilder);
        ConfigureDevice(modelBuilder);
        ConfigureEquipment(modelBuilder);
        ConfigureTag(modelBuilder);
        ConfigurePollGroup(modelBuilder);
        ConfigureNodeAcl(modelBuilder);
        ConfigureClusterNodeGenerationState(modelBuilder);
        ConfigureConfigAuditLog(modelBuilder);
        ConfigureExternalIdReservation(modelBuilder);
        ConfigureDriverHostStatus(modelBuilder);
        ConfigureDriverInstanceResilienceStatus(modelBuilder);
        ConfigureLdapGroupRoleMapping(modelBuilder);
        ConfigureEquipmentImportBatch(modelBuilder);
    }

    private static void ConfigureServerCluster(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ServerCluster>(e =>
        {
            e.ToTable("ServerCluster", t =>
            {
                t.HasCheckConstraint("CK_ServerCluster_RedundancyMode_NodeCount",
                    "((NodeCount = 1 AND RedundancyMode = 'None') " +
                    "OR (NodeCount = 2 AND RedundancyMode IN ('Warm', 'Hot')))");
            });
            e.HasKey(x => x.ClusterId);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);
            e.Property(x => x.Enterprise).HasMaxLength(32);
            e.Property(x => x.Site).HasMaxLength(32);
            e.Property(x => x.RedundancyMode).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.Notes).HasMaxLength(1024);
            e.Property(x => x.CreatedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.CreatedBy).HasMaxLength(128);
            e.Property(x => x.ModifiedAt).HasColumnType("datetime2(3)");
            e.Property(x => x.ModifiedBy).HasMaxLength(128);
            e.HasIndex(x => x.Name).IsUnique().HasDatabaseName("UX_ServerCluster_Name");
            e.HasIndex(x => x.Site).HasDatabaseName("IX_ServerCluster_Site");
        });
    }

    private static void ConfigureClusterNode(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ClusterNode>(e =>
        {
            e.ToTable("ClusterNode");
            e.HasKey(x => x.NodeId);
            e.Property(x => x.NodeId).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.RedundancyRole).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.Host).HasMaxLength(255);
            e.Property(x => x.ApplicationUri).HasMaxLength(256);
            e.Property(x => x.DriverConfigOverridesJson).HasColumnType("nvarchar(max)");
            e.Property(x => x.LastSeenAt).HasColumnType("datetime2(3)");
            e.Property(x => x.CreatedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.CreatedBy).HasMaxLength(128);

            e.HasOne(x => x.Cluster).WithMany(c => c.Nodes)
                .HasForeignKey(x => x.ClusterId)
                .OnDelete(DeleteBehavior.Restrict);

            // Fleet-wide unique per decision #86
            e.HasIndex(x => x.ApplicationUri).IsUnique().HasDatabaseName("UX_ClusterNode_ApplicationUri");
            e.HasIndex(x => x.ClusterId).HasDatabaseName("IX_ClusterNode_ClusterId");
            // At most one Primary per cluster
            e.HasIndex(x => x.ClusterId).IsUnique()
                .HasFilter("[RedundancyRole] = 'Primary'")
                .HasDatabaseName("UX_ClusterNode_Primary_Per_Cluster");
        });
    }

    private static void ConfigureClusterNodeCredential(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ClusterNodeCredential>(e =>
        {
            e.ToTable("ClusterNodeCredential");
            e.HasKey(x => x.CredentialId);
            e.Property(x => x.CredentialId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.NodeId).HasMaxLength(64);
            e.Property(x => x.Kind).HasConversion<string>().HasMaxLength(32);
            e.Property(x => x.Value).HasMaxLength(512);
            e.Property(x => x.RotatedAt).HasColumnType("datetime2(3)");
            e.Property(x => x.CreatedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.CreatedBy).HasMaxLength(128);

            e.HasOne(x => x.Node).WithMany(n => n.Credentials)
                .HasForeignKey(x => x.NodeId)
                .OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.NodeId, x.Enabled }).HasDatabaseName("IX_ClusterNodeCredential_NodeId");
            e.HasIndex(x => new { x.Kind, x.Value }).IsUnique()
                .HasFilter("[Enabled] = 1")
                .HasDatabaseName("UX_ClusterNodeCredential_Value");
        });
    }

    private static void ConfigureConfigGeneration(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ConfigGeneration>(e =>
        {
            e.ToTable("ConfigGeneration");
            e.HasKey(x => x.GenerationId);
            e.Property(x => x.GenerationId).UseIdentityColumn(seed: 1, increment: 1);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.Status).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.PublishedAt).HasColumnType("datetime2(3)");
            e.Property(x => x.PublishedBy).HasMaxLength(128);
            e.Property(x => x.Notes).HasMaxLength(1024);
            e.Property(x => x.CreatedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.CreatedBy).HasMaxLength(128);

            e.HasOne(x => x.Cluster).WithMany(c => c.Generations)
                .HasForeignKey(x => x.ClusterId)
                .OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Parent).WithMany()
                .HasForeignKey(x => x.ParentGenerationId)
                .OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.ClusterId, x.Status, x.GenerationId })
                .IsDescending(false, false, true)
                .IncludeProperties(x => x.PublishedAt)
                .HasDatabaseName("IX_ConfigGeneration_Cluster_Published");
            // One Draft per cluster at a time
            e.HasIndex(x => x.ClusterId).IsUnique()
                .HasFilter("[Status] = 'Draft'")
                .HasDatabaseName("UX_ConfigGeneration_Draft_Per_Cluster");
        });
    }

    private static void ConfigureNamespace(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Namespace>(e =>
        {
            e.ToTable("Namespace");
            e.HasKey(x => x.NamespaceRowId);
            e.Property(x => x.NamespaceRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.NamespaceId).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.Kind).HasConversion<string>().HasMaxLength(32);
            e.Property(x => x.NamespaceUri).HasMaxLength(256);
            e.Property(x => x.Notes).HasMaxLength(1024);

            e.HasOne(x => x.Generation).WithMany()
                .HasForeignKey(x => x.GenerationId)
                .OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Cluster).WithMany(c => c.Namespaces)
                .HasForeignKey(x => x.ClusterId)
                .OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.ClusterId, x.Kind }).IsUnique()
                .HasDatabaseName("UX_Namespace_Generation_Cluster_Kind");
            e.HasIndex(x => new { x.GenerationId, x.NamespaceUri }).IsUnique()
                .HasDatabaseName("UX_Namespace_Generation_NamespaceUri");
            e.HasIndex(x => new { x.GenerationId, x.NamespaceId }).IsUnique()
                .HasDatabaseName("UX_Namespace_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.NamespaceId, x.ClusterId }).IsUnique()
                .HasDatabaseName("UX_Namespace_Generation_LogicalId_Cluster");
            e.HasIndex(x => new { x.GenerationId, x.ClusterId })
                .HasDatabaseName("IX_Namespace_Generation_Cluster");
        });
    }

    private static void ConfigureUnsArea(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<UnsArea>(e =>
        {
            e.ToTable("UnsArea");
            e.HasKey(x => x.UnsAreaRowId);
            e.Property(x => x.UnsAreaRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.UnsAreaId).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(32);
            e.Property(x => x.Notes).HasMaxLength(512);

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Cluster).WithMany().HasForeignKey(x => x.ClusterId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.ClusterId }).HasDatabaseName("IX_UnsArea_Generation_Cluster");
            e.HasIndex(x => new { x.GenerationId, x.UnsAreaId }).IsUnique().HasDatabaseName("UX_UnsArea_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.ClusterId, x.Name }).IsUnique().HasDatabaseName("UX_UnsArea_Generation_ClusterName");
        });
    }

    private static void ConfigureUnsLine(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<UnsLine>(e =>
        {
            e.ToTable("UnsLine");
            e.HasKey(x => x.UnsLineRowId);
            e.Property(x => x.UnsLineRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.UnsLineId).HasMaxLength(64);
            e.Property(x => x.UnsAreaId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(32);
            e.Property(x => x.Notes).HasMaxLength(512);

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.UnsAreaId }).HasDatabaseName("IX_UnsLine_Generation_Area");
            e.HasIndex(x => new { x.GenerationId, x.UnsLineId }).IsUnique().HasDatabaseName("UX_UnsLine_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.UnsAreaId, x.Name }).IsUnique().HasDatabaseName("UX_UnsLine_Generation_AreaName");
        });
    }

    private static void ConfigureDriverInstance(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<DriverInstance>(e =>
        {
            e.ToTable("DriverInstance", t =>
            {
                t.HasCheckConstraint("CK_DriverInstance_DriverConfig_IsJson",
                    "ISJSON(DriverConfig) = 1");
                t.HasCheckConstraint("CK_DriverInstance_ResilienceConfig_IsJson",
                    "ResilienceConfig IS NULL OR ISJSON(ResilienceConfig) = 1");
            });
            e.HasKey(x => x.DriverInstanceRowId);
            e.Property(x => x.DriverInstanceRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.NamespaceId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);
            e.Property(x => x.DriverType).HasMaxLength(32);
            e.Property(x => x.DriverConfig).HasColumnType("nvarchar(max)");
            e.Property(x => x.ResilienceConfig).HasColumnType("nvarchar(max)");

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Cluster).WithMany().HasForeignKey(x => x.ClusterId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.ClusterId }).HasDatabaseName("IX_DriverInstance_Generation_Cluster");
            e.HasIndex(x => new { x.GenerationId, x.NamespaceId }).HasDatabaseName("IX_DriverInstance_Generation_Namespace");
            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId }).IsUnique().HasDatabaseName("UX_DriverInstance_Generation_LogicalId");
        });
    }

    private static void ConfigureDevice(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Device>(e =>
        {
            e.ToTable("Device", t =>
            {
                t.HasCheckConstraint("CK_Device_DeviceConfig_IsJson", "ISJSON(DeviceConfig) = 1");
            });
            e.HasKey(x => x.DeviceRowId);
            e.Property(x => x.DeviceRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.DeviceId).HasMaxLength(64);
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);
            e.Property(x => x.DeviceConfig).HasColumnType("nvarchar(max)");

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId }).HasDatabaseName("IX_Device_Generation_Driver");
            e.HasIndex(x => new { x.GenerationId, x.DeviceId }).IsUnique().HasDatabaseName("UX_Device_Generation_LogicalId");
        });
    }

    private static void ConfigureEquipment(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Equipment>(e =>
        {
            e.ToTable("Equipment");
            e.HasKey(x => x.EquipmentRowId);
            e.Property(x => x.EquipmentRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.EquipmentId).HasMaxLength(64);
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.DeviceId).HasMaxLength(64);
            e.Property(x => x.UnsLineId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(32);
            e.Property(x => x.MachineCode).HasMaxLength(64);
            e.Property(x => x.ZTag).HasMaxLength(64);
            e.Property(x => x.SAPID).HasMaxLength(64);
            e.Property(x => x.Manufacturer).HasMaxLength(64);
            e.Property(x => x.Model).HasMaxLength(64);
            e.Property(x => x.SerialNumber).HasMaxLength(64);
            e.Property(x => x.HardwareRevision).HasMaxLength(32);
            e.Property(x => x.SoftwareRevision).HasMaxLength(32);
            e.Property(x => x.AssetLocation).HasMaxLength(256);
            e.Property(x => x.ManufacturerUri).HasMaxLength(512);
            e.Property(x => x.DeviceManualUri).HasMaxLength(512);
            e.Property(x => x.EquipmentClassRef).HasMaxLength(128);

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId }).HasDatabaseName("IX_Equipment_Generation_Driver");
            e.HasIndex(x => new { x.GenerationId, x.UnsLineId }).HasDatabaseName("IX_Equipment_Generation_Line");
            e.HasIndex(x => new { x.GenerationId, x.EquipmentId }).IsUnique().HasDatabaseName("UX_Equipment_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.UnsLineId, x.Name }).IsUnique().HasDatabaseName("UX_Equipment_Generation_LinePath");
            e.HasIndex(x => new { x.GenerationId, x.EquipmentUuid }).IsUnique().HasDatabaseName("UX_Equipment_Generation_Uuid");
            e.HasIndex(x => new { x.GenerationId, x.ZTag }).HasFilter("[ZTag] IS NOT NULL").HasDatabaseName("IX_Equipment_Generation_ZTag");
            e.HasIndex(x => new { x.GenerationId, x.SAPID }).HasFilter("[SAPID] IS NOT NULL").HasDatabaseName("IX_Equipment_Generation_SAPID");
            e.HasIndex(x => new { x.GenerationId, x.MachineCode }).HasDatabaseName("IX_Equipment_Generation_MachineCode");
        });
    }

    private static void ConfigureTag(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Tag>(e =>
        {
            e.ToTable("Tag", t =>
            {
                t.HasCheckConstraint("CK_Tag_TagConfig_IsJson", "ISJSON(TagConfig) = 1");
            });
            e.HasKey(x => x.TagRowId);
            e.Property(x => x.TagRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.TagId).HasMaxLength(64);
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.DeviceId).HasMaxLength(64);
            e.Property(x => x.EquipmentId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);
            e.Property(x => x.FolderPath).HasMaxLength(512);
            e.Property(x => x.DataType).HasMaxLength(32);
            e.Property(x => x.AccessLevel).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.PollGroupId).HasMaxLength(64);
            e.Property(x => x.TagConfig).HasColumnType("nvarchar(max)");

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId, x.DeviceId }).HasDatabaseName("IX_Tag_Generation_Driver_Device");
            e.HasIndex(x => new { x.GenerationId, x.EquipmentId })
                .HasFilter("[EquipmentId] IS NOT NULL")
                .HasDatabaseName("IX_Tag_Generation_Equipment");
            e.HasIndex(x => new { x.GenerationId, x.TagId }).IsUnique().HasDatabaseName("UX_Tag_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.EquipmentId, x.Name }).IsUnique()
                .HasFilter("[EquipmentId] IS NOT NULL")
                .HasDatabaseName("UX_Tag_Generation_EquipmentPath");
            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId, x.FolderPath, x.Name }).IsUnique()
                .HasFilter("[EquipmentId] IS NULL")
                .HasDatabaseName("UX_Tag_Generation_FolderPath");
        });
    }

    private static void ConfigurePollGroup(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<PollGroup>(e =>
        {
            e.ToTable("PollGroup", t =>
            {
                t.HasCheckConstraint("CK_PollGroup_IntervalMs_Min", "IntervalMs >= 50");
            });
            e.HasKey(x => x.PollGroupRowId);
            e.Property(x => x.PollGroupRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.PollGroupId).HasMaxLength(64);
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.DriverInstanceId }).HasDatabaseName("IX_PollGroup_Generation_Driver");
            e.HasIndex(x => new { x.GenerationId, x.PollGroupId }).IsUnique().HasDatabaseName("UX_PollGroup_Generation_LogicalId");
        });
    }

    private static void ConfigureNodeAcl(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<NodeAcl>(e =>
        {
            e.ToTable("NodeAcl");
            e.HasKey(x => x.NodeAclRowId);
            e.Property(x => x.NodeAclRowId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.NodeAclId).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.LdapGroup).HasMaxLength(256);
            e.Property(x => x.ScopeKind).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.ScopeId).HasMaxLength(64);
            e.Property(x => x.PermissionFlags).HasConversion<int>();
            e.Property(x => x.Notes).HasMaxLength(512);

            e.HasOne(x => x.Generation).WithMany().HasForeignKey(x => x.GenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.GenerationId, x.ClusterId }).HasDatabaseName("IX_NodeAcl_Generation_Cluster");
            e.HasIndex(x => new { x.GenerationId, x.LdapGroup }).HasDatabaseName("IX_NodeAcl_Generation_Group");
            e.HasIndex(x => new { x.GenerationId, x.ScopeKind, x.ScopeId })
                .HasFilter("[ScopeId] IS NOT NULL")
                .HasDatabaseName("IX_NodeAcl_Generation_Scope");
            e.HasIndex(x => new { x.GenerationId, x.NodeAclId }).IsUnique().HasDatabaseName("UX_NodeAcl_Generation_LogicalId");
            e.HasIndex(x => new { x.GenerationId, x.ClusterId, x.LdapGroup, x.ScopeKind, x.ScopeId }).IsUnique()
                .HasDatabaseName("UX_NodeAcl_Generation_GroupScope");
        });
    }

    private static void ConfigureClusterNodeGenerationState(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ClusterNodeGenerationState>(e =>
        {
            e.ToTable("ClusterNodeGenerationState");
            e.HasKey(x => x.NodeId);
            e.Property(x => x.NodeId).HasMaxLength(64);
            e.Property(x => x.LastAppliedAt).HasColumnType("datetime2(3)");
            e.Property(x => x.LastAppliedStatus).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.LastAppliedError).HasMaxLength(2048);
            e.Property(x => x.LastSeenAt).HasColumnType("datetime2(3)");

            e.HasOne(x => x.Node).WithOne(n => n.GenerationState).HasForeignKey<ClusterNodeGenerationState>(x => x.NodeId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.CurrentGeneration).WithMany().HasForeignKey(x => x.CurrentGenerationId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => x.CurrentGenerationId).HasDatabaseName("IX_ClusterNodeGenerationState_Generation");
        });
    }

    private static void ConfigureConfigAuditLog(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ConfigAuditLog>(e =>
        {
            e.ToTable("ConfigAuditLog", t =>
            {
                t.HasCheckConstraint("CK_ConfigAuditLog_DetailsJson_IsJson",
                    "DetailsJson IS NULL OR ISJSON(DetailsJson) = 1");
            });
            e.HasKey(x => x.AuditId);
            e.Property(x => x.AuditId).UseIdentityColumn(seed: 1, increment: 1);
            e.Property(x => x.Timestamp).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.Principal).HasMaxLength(128);
            e.Property(x => x.EventType).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.NodeId).HasMaxLength(64);
            e.Property(x => x.DetailsJson).HasColumnType("nvarchar(max)");

            e.HasIndex(x => new { x.ClusterId, x.Timestamp })
                .IsDescending(false, true)
                .HasDatabaseName("IX_ConfigAuditLog_Cluster_Time");
            e.HasIndex(x => x.GenerationId)
                .HasFilter("[GenerationId] IS NOT NULL")
                .HasDatabaseName("IX_ConfigAuditLog_Generation");
        });
    }

    private static void ConfigureExternalIdReservation(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ExternalIdReservation>(e =>
        {
            e.ToTable("ExternalIdReservation");
            e.HasKey(x => x.ReservationId);
            e.Property(x => x.ReservationId).HasDefaultValueSql("NEWSEQUENTIALID()");
            e.Property(x => x.Kind).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.Value).HasMaxLength(64);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.FirstPublishedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.FirstPublishedBy).HasMaxLength(128);
            e.Property(x => x.LastPublishedAt).HasColumnType("datetime2(3)").HasDefaultValueSql("SYSUTCDATETIME()");
            e.Property(x => x.ReleasedAt).HasColumnType("datetime2(3)");
            e.Property(x => x.ReleasedBy).HasMaxLength(128);
            e.Property(x => x.ReleaseReason).HasMaxLength(512);

            // Active reservations unique per (Kind, Value) — filtered index lets released rows coexist with a new reservation of the same value.
            // The UX_ filtered index covers active-reservation lookups; history queries over released rows
            // fall back to the table scan (released rows are rare + small). No separate non-unique (Kind, Value)
            // index is declared because EF Core merges duplicate column sets into a single index, which would
            // clobber the filtered-unique name.
            e.HasIndex(x => new { x.Kind, x.Value }).IsUnique()
                .HasFilter("[ReleasedAt] IS NULL")
                .HasDatabaseName("UX_ExternalIdReservation_KindValue_Active");
            e.HasIndex(x => x.EquipmentUuid).HasDatabaseName("IX_ExternalIdReservation_Equipment");
        });
    }

    private static void ConfigureDriverHostStatus(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<DriverHostStatus>(e =>
        {
            e.ToTable("DriverHostStatus");
            // Composite key — one row per (server node, driver instance, probe-reported host).
            // A redundant 2-node cluster with one Galaxy driver reporting 3 platforms produces
            // 6 rows because each server node owns its own runtime view; the composite key is
            // what lets both views coexist without shadowing each other.
            e.HasKey(x => new { x.NodeId, x.DriverInstanceId, x.HostName });
            e.Property(x => x.NodeId).HasMaxLength(64);
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.HostName).HasMaxLength(256);
            e.Property(x => x.State).HasConversion<string>().HasMaxLength(16);
            e.Property(x => x.StateChangedUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.LastSeenUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.Detail).HasMaxLength(1024);

            // NodeId-only index drives the Admin UI's per-cluster drill-down (select all host
            // statuses for the nodes of a specific cluster via join on ClusterNode.ClusterId).
            e.HasIndex(x => x.NodeId).HasDatabaseName("IX_DriverHostStatus_Node");
            // LastSeenUtc index powers the Admin UI's stale-row query (now - LastSeen > N).
            e.HasIndex(x => x.LastSeenUtc).HasDatabaseName("IX_DriverHostStatus_LastSeen");
        });
    }

    private static void ConfigureDriverInstanceResilienceStatus(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<DriverInstanceResilienceStatus>(e =>
        {
            e.ToTable("DriverInstanceResilienceStatus");
            e.HasKey(x => new { x.DriverInstanceId, x.HostName });
            e.Property(x => x.DriverInstanceId).HasMaxLength(64);
            e.Property(x => x.HostName).HasMaxLength(256);
            e.Property(x => x.LastCircuitBreakerOpenUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.LastRecycleUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.LastSampledUtc).HasColumnType("datetime2(3)");
            // LastSampledUtc drives the Admin UI's stale-sample filter same way DriverHostStatus's
            // LastSeenUtc index does for connectivity rows.
            e.HasIndex(x => x.LastSampledUtc).HasDatabaseName("IX_DriverResilience_LastSampled");
        });
    }

    private static void ConfigureLdapGroupRoleMapping(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<LdapGroupRoleMapping>(e =>
        {
            e.ToTable("LdapGroupRoleMapping");
            e.HasKey(x => x.Id);
            e.Property(x => x.LdapGroup).HasMaxLength(512).IsRequired();
            e.Property(x => x.Role).HasConversion<string>().HasMaxLength(32);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.CreatedAtUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.Notes).HasMaxLength(512);

            // FK to ServerCluster when cluster-scoped; null for system-wide grants.
            e.HasOne(x => x.Cluster)
                .WithMany()
                .HasForeignKey(x => x.ClusterId)
                .OnDelete(DeleteBehavior.Cascade);

            // Uniqueness: one row per (LdapGroup, ClusterId). Null ClusterId is treated as its own
            // "bucket" so a system-wide row coexists with cluster-scoped rows for the same group.
            // SQL Server treats NULL as a distinct value in unique-index comparisons by default
            // since 2008 SP1 onwards under the session setting we use — tested in SchemaCompliance.
            e.HasIndex(x => new { x.LdapGroup, x.ClusterId })
                .IsUnique()
                .HasDatabaseName("UX_LdapGroupRoleMapping_Group_Cluster");

            // Hot-path lookup during cookie auth: "what grants does this user's set of LDAP
            // groups carry?". Fires on every sign-in so the index earns its keep.
            e.HasIndex(x => x.LdapGroup).HasDatabaseName("IX_LdapGroupRoleMapping_Group");
        });
    }

    private static void ConfigureEquipmentImportBatch(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<EquipmentImportBatch>(e =>
        {
            e.ToTable("EquipmentImportBatch");
            e.HasKey(x => x.Id);
            e.Property(x => x.ClusterId).HasMaxLength(64);
            e.Property(x => x.CreatedBy).HasMaxLength(128);
            e.Property(x => x.CreatedAtUtc).HasColumnType("datetime2(3)");
            e.Property(x => x.FinalisedAtUtc).HasColumnType("datetime2(3)");

            // Admin preview modal filters by user; finalise / drop both hit this index.
            e.HasIndex(x => new { x.CreatedBy, x.FinalisedAtUtc })
                .HasDatabaseName("IX_EquipmentImportBatch_Creator_Finalised");
        });

        modelBuilder.Entity<EquipmentImportRow>(e =>
        {
            e.ToTable("EquipmentImportRow");
            e.HasKey(x => x.Id);
            e.Property(x => x.ZTag).HasMaxLength(128);
            e.Property(x => x.MachineCode).HasMaxLength(128);
            e.Property(x => x.SAPID).HasMaxLength(128);
            e.Property(x => x.EquipmentId).HasMaxLength(64);
            e.Property(x => x.EquipmentUuid).HasMaxLength(64);
            e.Property(x => x.Name).HasMaxLength(128);
            e.Property(x => x.UnsAreaName).HasMaxLength(64);
            e.Property(x => x.UnsLineName).HasMaxLength(64);
            e.Property(x => x.Manufacturer).HasMaxLength(256);
            e.Property(x => x.Model).HasMaxLength(256);
            e.Property(x => x.SerialNumber).HasMaxLength(256);
            e.Property(x => x.HardwareRevision).HasMaxLength(64);
            e.Property(x => x.SoftwareRevision).HasMaxLength(64);
            e.Property(x => x.YearOfConstruction).HasMaxLength(8);
            e.Property(x => x.AssetLocation).HasMaxLength(512);
            e.Property(x => x.ManufacturerUri).HasMaxLength(512);
            e.Property(x => x.DeviceManualUri).HasMaxLength(512);
            e.Property(x => x.RejectReason).HasMaxLength(512);

            e.HasOne(x => x.Batch)
                .WithMany(b => b.Rows)
                .HasForeignKey(x => x.BatchId)
                .OnDelete(DeleteBehavior.Cascade);

            e.HasIndex(x => x.BatchId).HasDatabaseName("IX_EquipmentImportRow_Batch");
        });
    }
}