using System.Data;
using AMREZ.EOP.Abstractions.Applications.Tenancy;
using AMREZ.EOP.Abstractions.Applications.UseCases.Tenancy;
using AMREZ.EOP.Abstractions.Infrastructures.Common;
using AMREZ.EOP.Abstractions.Infrastructures.Repositories;
using AMREZ.EOP.Contracts.DTOs.Tenancy.ListTenants;
using Microsoft.AspNetCore.Http;

namespace AMREZ.EOP.Application.UseCases.Tenancy;

public sealed class ListTenantsUseCase : IListTenantsUseCase
{
    private readonly ITenantResolver _resolver;
    private readonly IHttpContextAccessor _http;
    private readonly IUnitOfWork _uow;
    private readonly ITenantRepository _repo;

    public ListTenantsUseCase(ITenantResolver resolver, IHttpContextAccessor http, IUnitOfWork uow, ITenantRepository repo)
    { _resolver = resolver; _http = http; _uow = uow; _repo = repo; }

    public async Task<ListTenantsResponse?> ExecuteAsync(ListTenantsRequest request, CancellationToken ct = default)
    {
        var http = _http.HttpContext ?? throw new InvalidOperationException("No HttpContext");
        var ctx = _resolver.Resolve(http, hint: null);
        if (ctx is null) return null;

        await _uow.BeginAsync(ctx, IsolationLevel.ReadCommitted, ct);
        try
        {
            var items = (await _repo.ListTenantsAsync(ct))
                .Select(x => new TenantDto(x.TenantKey, x.Schema, x.ConnectionString, x.Mode, x.IsActive, x.UpdatedAtUtc))
                .ToList();

            await _uow.CommitAsync(ct);
            return new ListTenantsResponse(items);
        }
        catch
        {
            await _uow.RollbackAsync(ct);
            throw;
        }
    }
}