using FabApprovalWorkerService.Models;
using FabApprovalWorkerService.Utilities;

using System.Text;

namespace FabApprovalWorkerService.Services;

public interface ICorrectiveActionService {
    Task<IEnumerable<CorrectiveAction>> GetCorrectiveActionsWithFollowUpInFiveDays();
    Task CreateCorrectiveActionFollowUpApproval(int caNo, int qaId);
    Task<bool> CANumberIsActive(int number);
    Task<CorrectiveAction> GetCorrectiveActionById(int id);
}

public class CorrectiveActionService : ICorrectiveActionService {
    private readonly ILogger<CorrectiveActionService> _logger;
    private readonly IDalService _dalService;

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

    public async Task CreateCorrectiveActionFollowUpApproval(int caNo, int qaId) {
        try {
            _logger.LogInformation($"Attempting to create a follow up approval for CA {caNo} by QA {qaId}");

            if (caNo <= 0) throw new ArgumentException($"{caNo} is not a valid CA number");
            if (qaId <= 0) throw new ArgumentException($"{qaId} is not a valid User Id");

            string today = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff");

            StringBuilder queryBuilder = new();
            queryBuilder.Append("insert into Approval (IssueID, RoleName, SubRole, UserID, SubRoleID, ItemStatus, Step,  ");
            queryBuilder.Append("AssignedDate, NotifyDate,RoleAssignedDate, ApprovalType, DocumentTypeID) ");
            queryBuilder.Append($"values ({caNo}, '8DQAFollowUp', '8DQAFollowUp', {qaId}, 335, 0, 2, ");
            queryBuilder.Append($"'{today}', '{today}', '{today}', 1, 9);");

            await _dalService.ExecuteAsync(queryBuilder.ToString());
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to create a follow up approval for CA {caNo} by QA {qaId}. ");
            errMsgBuilder.Append($"Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }

    public async Task<IEnumerable<CorrectiveAction>> GetCorrectiveActionsWithFollowUpInFiveDays() {
        try {
            _logger.LogInformation("Attempting to get all CAs needing follow up in five days");

            DateTime fiveDaysFromToday = DateTime.Now.Date.AddDays(5);
            DateTime sixDaysFromToday = DateTime.Now.Date.AddDays(6);

            StringBuilder queryBuilder = new();
            queryBuilder.Append("select * from _8DCorrectiveAction where ApprovalStatus = 1 and FollowUpDate is not null ");
            queryBuilder.Append($"and FollowUpDate < '{sixDaysFromToday.ToString("yyyy-MM-dd HH:mm:ss")}' ");
            queryBuilder.Append($"and FollowUpDate >= '{fiveDaysFromToday.ToString("yyyy-MM-dd HH:mm:ss")}';");

            return (await _dalService.QueryAsync<CorrectiveAction>(queryBuilder.ToString())).ToList();
        } catch (Exception ex) {
            StringBuilder errMsgBuilder = new();
            errMsgBuilder.Append($"An exception occurred when attempting to get all CAs needing follow up in five days. ");
            errMsgBuilder.Append($"Exception: {ex.Message}");
            _logger.LogError(errMsgBuilder.ToString());
            throw;
        }
    }

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

            if (number <= 0) return false;

            StringBuilder queryBuilder = new();
            queryBuilder.Append($"select count(CANo) as count from _8DCorrectiveAction ");
            queryBuilder.Append($"where CANo={number} and Deleted=0 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 CA#, because {ex.Message}");
            throw;
        }
    }

    public async Task<CorrectiveAction> GetCorrectiveActionById(int id) {
        try {
            _logger.LogInformation($"Attempting to get CA# {id}");

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

            string sql = $"select * from _8DCorrectiveAction where CANo={id}";

            CorrectiveAction? ca = (await _dalService.QueryAsync<CorrectiveAction>(sql)).FirstOrDefault();

            if (ca is null) throw new Exception($"no CA found with CA# {id}");

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