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('=');
}