using bnhtrade.Core.Data.Database._BoilerPlate;
using System;
using System.Collections.Generic;
using Microsoft.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bnhtrade.Core.Data.Database
{
    internal class SqlUpdateBuilder
    {
        private Dictionary<string, int> _usedUpdateFields = new Dictionary<string, int>();
        private Dictionary<string, object> _parameterList = new Dictionary<string, object>();
        private string _tableName = string.Empty;
        private int _parameterCount = 0;
        private string _sqlUpdate = string.Empty;
        private string _sqlWhere = string.Empty;
        private bool _updateIsSet = false;
        private bool _whereIsSet = false;

        public SqlUpdateBuilder() { }

        public void Innit()
        {
            _usedUpdateFields.Clear();
            _parameterList.Clear();
            _tableName = string.Empty;
            _parameterCount = 0;
            _sqlUpdate = string.Empty;
            _sqlWhere = string.Empty;
            _updateIsSet = false;
            _whereIsSet = false;
        }

        public void SetTableName(string tableName)
        {
            if (string.IsNullOrEmpty(tableName))
            {
                throw new ArgumentException("Table name cannot be null or empty.", nameof(tableName));
            }
            _tableName = tableName;
        }

        public void AddUpdateArugment(string columnName, object newValue)
        {
            if (string.IsNullOrEmpty(columnName) || newValue == null)
            {
                throw new ArgumentException("Column name and new value cannot be null or empty.");
            }
            if (_usedUpdateFields.ContainsKey(columnName))
            {
                throw new ArgumentException($"Column '{columnName}' already exists in the update arguments.", nameof(columnName));
            }

            // add the update arguments to sql string and parameter list
            if (_updateIsSet)
            {
                _sqlUpdate += @", 
                    ";
            }
            else
            {
                _updateIsSet = true;
            }

            _parameterCount++;
            _sqlUpdate += columnName + " = @parameter" + _parameterCount;
            _parameterList.Add("@parameter" + _parameterCount, newValue);
        }

        public void AddWhereArugment(string columnName, object value)
        {
            if (string.IsNullOrEmpty(columnName) || value == null)
            {
                throw new ArgumentException("Column name and new value cannot be null or empty.");
            }

            // add the where arguments to sql string and parameter list
            if (_whereIsSet)
            {
                _sqlWhere += @", 
                    ";
            }
            else
            {
                _whereIsSet = true;
            }

            _parameterCount++;
            _sqlWhere += columnName + " = @parameter" + _parameterCount;
            _parameterList.Add("@parameter" + _parameterCount, value);
        }

        public string GetSqlString()
        {
            if (_updateIsSet == false || _whereIsSet == false || string.IsNullOrEmpty(_tableName))
            {
                throw new InvalidOperationException("Table name, update arguments, and where arguments must be set before generating SQL string.");
            }

            string sql = @"
                UPDATE "+ _tableName + @"
                SET " + _sqlUpdate + @"
                WHERE " + _sqlWhere + ";";

            return sql;
        }

        public void AddParametersToSqlCommand(System.Data.SqlClient.SqlCommand cmd)
        {
            if (_parameterList != null)
            {
                foreach (var item in _parameterList)
                {
                    cmd.Parameters.AddWithValue(item.Key, item.Value);
                }
            }
        }

        public void AddParametersToSqlCommand(Microsoft.Data.SqlClient.SqlCommand cmd)
        {
            if (_parameterList != null)
            {
                foreach (var item in _parameterList)
                {
                    cmd.Parameters.AddWithValue(item.Key, item.Value);
                }
            }
        }
    }
}