namespace LaaProduction.Cordonel.Models
{
    using System;
    using System.Collections;
    using System.Collections.Generic;

    public class WhereQuery : IEnumerable<KeyValuePair<string, object>>
    {
        private string sql = string.Empty;
        private IDictionary<string, object> parameters
            = new Dictionary<string, object>();

        public IEnumerator<KeyValuePair<string, object>> GetEnumerator() 
            => this.parameters.GetEnumerator();

        public override string ToString() 
            => this.sql;

        internal void And(string column, string name, object value)
        {
            if (string.IsNullOrWhiteSpace(this.sql))
            {
                this.sql = " WHERE ";
            }
            else
            {
                this.sql += $"{Environment.NewLine}   AND ";
            }

            this.sql += $"{column} = @{name}";
            this.parameters[name] = value;
        }

        IEnumerator IEnumerable.GetEnumerator() 
            => this.GetEnumerator();
    }
}