using FabApprovalWorkerService.Models;

using System.Text;

namespace FabApprovalWorkerService.Services;

public interface ITrainingService {
    Task<IEnumerable<int>> GetTrainingIdsForECN(int ecnNumber);
    Task DeleteTrainingAssignment(int trainingId);
    Task<IEnumerable<int>> GetTrainingAssignmentIdsForTraining(int trainingId);
    Task DeleteDocAssignment(int trainingAssignmentId);
}

public class TrainingService : ITrainingService {
    private ILogger<TrainingService> _logger;
    private IDalService _dalService;

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

    public async Task DeleteDocAssignment(int trainingAssignmentId) {
        if (trainingAssignmentId <= 0) throw new ArgumentException($"Invalid training assignment id: {trainingAssignmentId}");
        
        try {
            _logger.LogInformation($"Attempting to delete training doc assignments for training assignment {trainingAssignmentId}");

            StringBuilder queryBuilder = new();
            queryBuilder.Append($"update TrainingDocAcks set Deleted = 1, ");
            queryBuilder.Append($"DeletedDate = {DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")} ");
            queryBuilder.Append($"where TrainingAssignmentID = {trainingAssignmentId} and Reviewed = 0;");

            await _dalService.ExecuteAsync(queryBuilder.ToString());
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to delete training doc assignment ");
            errMsgBuilder.Append($"{trainingAssignmentId}. Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }

    public async Task DeleteTrainingAssignment(int trainingId) {
        if (trainingId <= 0) throw new ArgumentException($"Invalid training id: {trainingId}");

        try {
            _logger.LogInformation($"Attempting to delete training assignment {trainingId}");

            StringBuilder queryBuilder = new();
            queryBuilder.Append($"update TrainingAssignments set Deleted = 1, ");
            queryBuilder.Append($"DeletedDate = {DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")} ");
            queryBuilder.Append($"where TrainingID = {trainingId} and status = 0;");

            await _dalService.ExecuteAsync(queryBuilder.ToString());
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to delete training assignment ");
            errMsgBuilder.Append($"{trainingId}. Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }

    public async Task<IEnumerable<int>> GetTrainingAssignmentIdsForTraining(int trainingId) {
        if (trainingId <= 0) throw new ArgumentException($"Invalid trainingID: {trainingId}");

        try {
            _logger.LogInformation($"Attempting to get training assignment ids for training id {trainingId}");

            string sql = $"select ID from TrainingAssignments where TrainingID = {trainingId};";

            return await _dalService.QueryAsync<int>(sql);
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to get training assignment ids ");
            errMsgBuilder.Append($"for training id {trainingId}. Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }

    public async Task<IEnumerable<int>> GetTrainingIdsForECN(int ecnNumber) {
        if (ecnNumber <= 0) throw new ArgumentException($"Invalid ecnNumber: {ecnNumber}");

        try {
            _logger.LogInformation($"Attempting to get training ids for ecn {ecnNumber}");

            string sql = $"select TrainingID from Training where ECN = {ecnNumber};";

            return await _dalService.QueryAsync<int>(sql);
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to get training ids ");
            errMsgBuilder.Append($"for ECN {ecnNumber}. Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }
}