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AMREZ.EOP.Infrastructures/Tenancy/TenantDbContextFactory.cs

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+using AMREZ.EOP.Abstractions.Applications.Tenancy;
+using AMREZ.EOP.Domain.Shared.Tenancy;
+using AMREZ.EOP.Infrastructures.Data;
+using AMREZ.EOP.Infrastructures.Options;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+
+namespace AMREZ.EOP.Infrastructures.Tenancy;
+
+public sealed class TenantDbContextFactory : ITenantDbContextFactory
+{
+    private readonly IOptions<AuthOptions> _opts;
+    private readonly SearchPathInterceptor _searchPath;
+    private readonly TenantRlsInterceptor _rls;
+
+    public TenantDbContextFactory(IOptions<AuthOptions> opts, SearchPathInterceptor searchPath, TenantRlsInterceptor rls)
+    { _opts = opts; _searchPath = searchPath; _rls = rls; }
+
+    public TContext Create<TContext>(ITenantContext t) where TContext : class
+    {
+        if (typeof(TContext) != typeof(AppDbContext))
+            throw new NotSupportedException($"Unsupported context: {typeof(TContext).Name}");
+
+        var builder = new DbContextOptionsBuilder<AppDbContext>();
+
+        // ✅ การ์ด: ถ้า connection string ของ tenant ไม่ใช่รูปแบบ key=value ให้ fallback ไป DefaultConnection (platform)
+        var raw = (t.ConnectionString ?? string.Empty).Trim();
+        string conn = IsLikelyValidConnectionString(raw)
+            ? raw
+            : (_opts.Value.DefaultConnection ?? string.Empty).Trim();
+
+        if (!IsLikelyValidConnectionString(conn))
+            throw new InvalidOperationException(
+                $"Invalid connection string for tenant '{t.TenantKey}'. Provide a valid per-tenant or DefaultConnection.");
+
+        builder.UseNpgsql(conn);
+
+        // RLS per-tenant (ถ้า platform ควรกำหนดให้ Interceptor ทำงานในโหมด platform/disable ตามที่คุณนิยาม)
+        _rls.Configure(t.Id);
+        builder.AddInterceptors(_rls);
+
+        // ใช้ schema ต่อ tenant เมื่อเปิดโหมดนี้
+        if (_opts.Value.UseSchemaPerTenant)
+        {
+            var schema = string.IsNullOrWhiteSpace(t.Schema) ? t.Id : t.Schema!.Trim();
+            _searchPath.Configure(schema, enabled: true); // CREATE IF NOT EXISTS + SET LOCAL search_path
+            builder.AddInterceptors(_searchPath);
+        }
+
+        return (new AppDbContext(builder.Options) as TContext)!;
+    }
+
+    private static bool IsLikelyValidConnectionString(string s)
+        => !string.IsNullOrWhiteSpace(s) && s.Contains('=');
+}