using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace brecal.model
{
    public class Role : DbEntity
    {

        #region Properties

        public string? Name { get; set; }

        public string? Description { get; set; }

        #endregion

        #region public static methods

        public static async Task<List<Role>> LoadAll(IDBManager manager)
        {
            List<DbEntity> loadResultList = await manager.Load(SetLoadQuery, LoadElems);
            List<Role> result = new();
            foreach (Role r in loadResultList.Cast<Role>())
                result.Add(r);
            return result;
        }

        public static void SetLoadQuery(IDbCommand cmd, params object?[] list)
        {
            cmd.CommandText = "SELECT id, name, description, created, modified FROM role";
        }

        public static List<DbEntity> LoadElems(IDataReader reader)
        {
            List<DbEntity> result = new List<DbEntity>();
            while (reader.Read())
            {
                Role r = new();
                r.Id = (uint)reader.GetInt32(0);
                if (!reader.IsDBNull(1)) r.Name = reader.GetString(1);
                if (!reader.IsDBNull(2)) r.Description = reader.GetString(2);               
                if (!reader.IsDBNull(3)) r.Created = reader.GetDateTime(3);
                if (!reader.IsDBNull(4)) r.Modified = reader.GetDateTime(4);
                result.Add(r);
            }
            return result;
        }

        #endregion

        #region overrides

        public override void SetUpdate(IDbCommand cmd)
        {
            cmd.CommandText = "UPDATE role set name = @NAME, description = @DESC WHERE id = @ID";
            this.SetParameters(cmd);
        }

        public override void SetCreate(IDbCommand cmd)
        {
            cmd.CommandText = "INSERT INTO role (name, description) VALUES ( @NAME, @DESC)";
            this.SetParameters(cmd);
        }

        public override void SetDelete(IDbCommand cmd)
        {
            cmd.CommandText = "DELETE FROM role WHERE id = @ID";

            IDataParameter idParam = cmd.CreateParameter();
            idParam.ParameterName = "ID";
            idParam.Value = this.Id;
            cmd.Parameters.Add(idParam);
        }

        public override string ToString()
        {
            return this.Name ?? $"{base.Id} - {this.GetType().Name}";
        }

        #endregion

        #region private methods

        private void SetParameters(IDbCommand cmd)
        {
            IDbDataParameter name = cmd.CreateParameter();
            name.ParameterName = "NAME";
            name.Value = this.Name;
            cmd.Parameters.Add(name);

            IDbDataParameter desc = cmd.CreateParameter();
            desc.ParameterName = "DESC";
            desc.Value = this.Description;
            cmd.Parameters.Add(desc);            

            IDataParameter idParam = cmd.CreateParameter();
            idParam.ParameterName = "ID";
            idParam.Value = this.Id;
            cmd.Parameters.Add(idParam);
        }

        #endregion

    }
}