using AMREZ.EOP.Domain.Entities.Tenancy;
using AMREZ.EOP.Domain.Shared.Tenancy;
using AMREZ.EOP.Infrastructures.Data;
using AMREZ.EOP.Infrastructures.Options;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;

namespace AMREZ.EOP.Infrastructures.Tenancy;

    /// <summary>
    /// โหลดค่า Tenants / Domains ที่ IsActive=true จาก meta.* ใส่ TenantMap ตอนสตาร์ต
    /// และ bootstrap 'public' ถ้ายังไม่มี
    /// </summary>
    public sealed class TenantMapLoader : IHostedService
    {
        private readonly IServiceProvider _sp;
        public TenantMapLoader(IServiceProvider sp) => _sp = sp;

        public async Task StartAsync(CancellationToken ct)
        {
            using var scope = _sp.CreateScope();
            var db   = scope.ServiceProvider.GetRequiredService<AppDbContext>();
            var map  = scope.ServiceProvider.GetRequiredService<TenantMap>();
            var opt  = scope.ServiceProvider.GetRequiredService<IOptions<AuthOptions>>().Value;

            // 1) Load tenants (active เท่านั้น)
            var tenants = await db.Set<TenantConfig>()
                .AsNoTracking()
                .Where(x => x.IsActive)
                .ToListAsync(ct);

            foreach (var t in tenants)
            {
                map.UpsertTenant(
                    t.TenantKey,
                    new TenantContext
                    {
                        Id = t.TenantKey,
                        Schema = string.IsNullOrWhiteSpace(t.Schema) ? t.TenantKey : t.Schema,
                        ConnectionString = string.IsNullOrWhiteSpace(t.ConnectionString) ? null : t.ConnectionString,
                        Mode = t.Mode
                    }
                );
            }

            // 2) Load domains (active เท่านั้น)
            var domains = await db.Set<TenantDomain>()
                .AsNoTracking()
                .Where(d => d.IsActive)
                .ToListAsync(ct);

            foreach (var d in domains)
            {
                if (d.IsPlatformBaseDomain)
                {
                    map.AddBaseDomain(d.Domain);
                }
                else if (!string.IsNullOrWhiteSpace(d.TenantKey))
                {
                    map.MapDomain(d.Domain, d.TenantKey!);
                }
            }

            // 3) Bootstrap 'public' ถ้ายังไม่มี (กัน chicken-and-egg)
            if (!map.TryGetBySlug("public", out _))
            {
                map.UpsertTenant(
                    "public",
                    new TenantContext
                    {
                        Id = "public",
                        Schema = "public",
                        ConnectionString = string.IsNullOrWhiteSpace(opt.DefaultConnection) ? null : opt.DefaultConnection,
                        Mode = TenantMode.Rls
                    }
                );
            }
        }

        public Task StopAsync(CancellationToken ct) => Task.CompletedTask;
    }