using FabApprovalWorkerService.Models;
using FabApprovalWorkerService.Utilities;

using System.Text;

namespace FabApprovalWorkerService.Services;

public interface IMRBService {
    Task<bool> MRBNumberIsActive(int number);
    Task<MRB> GetMRBById(int id);
}

public class MRBService : IMRBService {
    private readonly ILogger<MRBService> _logger;
    private readonly IDalService _dalService;

    public MRBService(ILogger<MRBService> logger, IDalService dalService) {
        _logger = logger ?? throw new ArgumentNullException("ILogger not injected");
        _dalService = dalService ?? throw new ArgumentNullException("IDalService not injected");
    }

    public async Task<bool> MRBNumberIsActive(int number) {
        try {
            _logger.LogInformation($"Attempting to determine if {number} is an active MRB#");

            if (number <= 0) return false;

            StringBuilder queryBuilder = new();
            queryBuilder.Append($"select count(MRBNumber) as count from MRB where MRBNumber={number} and ");
            queryBuilder.Append($"(CloseDate is null or CloseDate >= '{DateTimeUtilities.MAX_DT.ToString("yyyy-MM-dd HH:mm")}')");

            int rowsReturned = (await _dalService.QueryAsync<int>(queryBuilder.ToString())).FirstOrDefault();

            return rowsReturned > 0;
        } catch (Exception ex) {
            _logger.LogError($"Unable to determine if {number} is an active MRB#, because {ex.Message}");
            throw;
        }
    }

    public async Task<MRB> GetMRBById(int id) {
        try {
            _logger.LogInformation("Attempting to get an MRB by ID");

            if (id < 0) throw new ArgumentException("Invalid MRB number");

            string sql = $"select * from MRB where MRBNumber={id}";

            MRB? mrb = (await _dalService.QueryAsync<MRB>(sql)).FirstOrDefault();

            if (mrb is null) throw new Exception($"Unable to get MRB {id}");

            return mrb;
        } catch (Exception ex) {
            _logger.LogError($"Unable to get MRB# {id}, because {ex.Message}");
            throw;
        }
    }
}