ROLAC/API/ROLAC.API/Data/AppDbContext.cs

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using ROLAC.API.Entities;

namespace ROLAC.API.Data;

public class AppDbContext : IdentityDbContext<AppUser, AppRole, string>
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }

    public DbSet<RefreshToken> RefreshTokens => Set<RefreshToken>();
    public DbSet<Member>       Members       => Set<Member>();
    public DbSet<FamilyUnit>   FamilyUnits   => Set<FamilyUnit>();

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        // ── RefreshToken (unchanged) ────────────────────────────────────────
        builder.Entity<RefreshToken>(entity =>
        {
            entity.HasKey(e => e.Id);
            entity.HasIndex(e => e.TokenHash).IsUnique();
            entity.Property(e => e.TokenHash).HasMaxLength(64).IsRequired();
            entity.Property(e => e.UserId).HasMaxLength(450).IsRequired();
            entity.Property(e => e.DeviceInfo).HasMaxLength(200);
            entity.Property(e => e.IpAddress).HasMaxLength(45);
            entity.Property(e => e.ReplacedByHash).HasMaxLength(64);
            entity.HasOne(e => e.User).WithMany(u => u.RefreshTokens)
                  .HasForeignKey(e => e.UserId).OnDelete(DeleteBehavior.Cascade);
            entity.Ignore(e => e.IsExpired);
            entity.Ignore(e => e.IsRevoked);
            entity.Ignore(e => e.IsActive);
        });

        // ── AppUser (unchanged + new unique index on MemberId) ──────────────
        builder.Entity<AppUser>(entity =>
        {
            entity.Property(e => e.LanguagePreference).HasMaxLength(10).HasDefaultValue("en");
            // Nullable unique: one member ↔ one user account, but member can have no account
            entity.HasIndex(e => e.MemberId).IsUnique()
                  .HasFilter("\"MemberId\" IS NOT NULL");
        });

        // ── AppRole (unchanged) ─────────────────────────────────────────────
        builder.Entity<AppRole>(entity =>
        {
            entity.Property(e => e.Description).HasMaxLength(500);
        });

        // ── FamilyUnit ──────────────────────────────────────────────────────
        builder.Entity<FamilyUnit>(entity =>
        {
            entity.Property(e => e.FamilyName_en).HasMaxLength(200);
            entity.Property(e => e.FamilyName_zh).HasMaxLength(200);
        });

        // ── Member ──────────────────────────────────────────────────────────
        builder.Entity<Member>(entity =>
        {
            entity.HasQueryFilter(m => !m.IsDeleted);

            entity.Property(e => e.FirstName_en).HasMaxLength(100).IsRequired();
            entity.Property(e => e.LastName_en).HasMaxLength(100).IsRequired();
            entity.Property(e => e.NickName).HasMaxLength(100);
            entity.Property(e => e.FirstName_zh).HasMaxLength(100);
            entity.Property(e => e.LastName_zh).HasMaxLength(100);
            entity.Property(e => e.Gender).HasMaxLength(10);
            entity.Property(e => e.BaptismChurch).HasMaxLength(200);
            entity.Property(e => e.Email).HasMaxLength(200);
            entity.Property(e => e.PhoneCell).HasMaxLength(30);
            entity.Property(e => e.PhoneHome).HasMaxLength(30);
            entity.Property(e => e.Address).HasMaxLength(500);
            entity.Property(e => e.City).HasMaxLength(100);
            entity.Property(e => e.State).HasMaxLength(50);
            entity.Property(e => e.ZipCode).HasMaxLength(20);
            entity.Property(e => e.Country).HasMaxLength(100).HasDefaultValue("USA");
            entity.Property(e => e.PhotoBlobPath).HasMaxLength(500);
            entity.Property(e => e.Status).HasMaxLength(20).HasDefaultValue("Member");
            entity.Property(e => e.LanguagePreference).HasMaxLength(10).HasDefaultValue("en");
            entity.Property(e => e.CreatedBy).HasMaxLength(450);
            entity.Property(e => e.UpdatedBy).HasMaxLength(450);
            entity.Property(e => e.DeletedBy).HasMaxLength(450);

            entity.HasIndex(e => e.Status).HasFilter("\"IsDeleted\" = false");
            entity.HasIndex(e => e.Email).HasFilter("\"Email\" IS NOT NULL");
            entity.HasIndex(e => e.FamilyUnitId);

            entity.HasOne(e => e.FamilyUnit).WithMany()
                  .HasForeignKey(e => e.FamilyUnitId).OnDelete(DeleteBehavior.SetNull);
        });
    }
}