using System.Text;

using FabApprovalWorkerService.Models;
using FabApprovalWorkerService.Utilities;

namespace FabApprovalWorkerService.Services;

public interface IPCRBService {
    Task<bool> PCRBNumberIsActive(int number);
    public Task<PCRB> GetPCRBByPlanNumber(int planNumber);
}

public class PCRBService : IPCRBService {
    private readonly ILogger<PCRBService> _logger;
    private readonly IDalService _dalService;

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

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

            if (number <= 0) return false;

            StringBuilder queryBuilder = new();
            queryBuilder.Append("select count(PlanNumber) as count from CCChangeControl ");
            queryBuilder.Append($"where PlanNumber={number} and ");
            queryBuilder.Append($"(ClosedDate is null or ClosedDate >= '{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 PCRB#, because {ex.Message}");
            throw;
        }
    }

    public async Task<PCRB> GetPCRBByPlanNumber(int planNumber) {
        try {
            _logger.LogInformation("Attempting to get a PCRB by plan#");

            if (planNumber <= 0) throw new ArgumentException($"{planNumber} is not a valid PCRB#");

            string sql = $"select * from CCChangeControl where PlanNumber={planNumber}";

            PCRB? pcrb = (await _dalService.QueryAsync<PCRB>(sql)).FirstOrDefault();

            if (pcrb is null) throw new Exception($"unable to find PCRB {planNumber}");

            return pcrb;
        } catch (Exception ex) {
            _logger.LogError($"Unable to get PCRB# {planNumber}, because {ex.Message}");
            throw;
        }
    }
}