using System.Data;

namespace brecal.model
{
    public class User : DbEntity
    {
        #region Properties

        public string? Firstname { get; set; }

        public string? Lastname { get; set; }

        public string Username { get; set; } = "";

        public string? PasswordHash { get; set; }

        public string? APIKey { get; set; }

        public uint? Participant_Id { get; set; }

        #endregion

        #region public static methods

        public static async Task<List<User>> LoadForParticipant(Participant? p, IDBManager manager)
        {
            List<DbEntity> loadResultList = await manager.Load(SetLoadQuery, LoadElems, args: p);
            List<User> result = new();
            foreach (User u in loadResultList.Cast<User>())
                result.Add(u);
            return result;
        }

        public static void SetLoadQuery(IDbCommand cmd, params object?[] args)
        {
            cmd.CommandText = "SELECT id, first_name, last_name, user_name, api_key, created, modified FROM user WHERE participant_id = @PID";
            if (args.Length != 1 || !(args[0] is Participant))
                throw new ArgumentException("loader needs single partipant as argument");
            IDataParameter pid = cmd.CreateParameter();
            pid.ParameterName = "PID";
            if (args[0] is Participant p)
                pid.Value = p.Id;
            cmd.Parameters.Add(pid);
        }

        public static List<DbEntity> LoadElems(IDataReader reader)
        {
            List<DbEntity> result = new List<DbEntity>();
            while (reader.Read())
            {
                User u = new();
                u.Id = (uint)reader.GetInt32(0);
                if (!reader.IsDBNull(1)) u.Firstname = reader.GetString(1);
                if (!reader.IsDBNull(2)) u.Lastname = reader.GetString(2);
                if (!reader.IsDBNull(3)) u.Username = reader.GetString(3);
                if (!reader.IsDBNull(4)) u.APIKey = reader.GetString(4);
                if (!reader.IsDBNull(5)) u.Created = reader.GetDateTime(5);
                if (!reader.IsDBNull(6)) u.Modified = reader.GetDateTime(6);
                result.Add(u);
            }
            return result;
        }

        #endregion

        #region overrides

        public override void SetUpdate(IDbCommand cmd)
        {
            if(!string.IsNullOrEmpty(this.PasswordHash))
                cmd.CommandText = "UPDATE user SET first_name = @FIRSTNAME, last_name = @LASTNAME, user_name = @USERNAME, password_hash = @PWHASH, api_key = @APIKEY WHERE id = @ID";
            else
                cmd.CommandText = "UPDATE user SET first_name = @FIRSTNAME, last_name = @LASTNAME, user_name = @USERNAME, api_key = @APIKEY WHERE id = @ID";
            this.SetParameters(cmd);
        }

        public override void SetCreate(IDbCommand cmd)
        {            
            cmd.CommandText = "INSERT INTO user (participant_id, first_name, last_name, user_name, password_hash, api_key) VALUES ( @PID, @FIRSTNAME, @LASTNAME, @USERNAME, @PWHASH, @APIKEY)";
            this.SetParameters(cmd);
        }

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

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

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

        #endregion

        #region private methods

        private void SetParameters(IDbCommand cmd)
        {
            IDbDataParameter id = cmd.CreateParameter();
            id.ParameterName = "ID";
            id.Value = this.Id;
            cmd.Parameters.Add(id);

            IDbDataParameter pid = cmd.CreateParameter();
            pid.ParameterName = "PID";
            pid.Value = this.Participant_Id;
            cmd.Parameters.Add(pid);

            IDbDataParameter firstname = cmd.CreateParameter();
            firstname.ParameterName = "FIRSTNAME";
            firstname.Value = this.Firstname;
            cmd.Parameters.Add(firstname);

            IDbDataParameter lastname = cmd.CreateParameter();
            lastname.ParameterName = "LASTNAME";
            lastname.Value = this.Lastname;
            cmd.Parameters.Add(lastname);

            IDbDataParameter username = cmd.CreateParameter();
            username.ParameterName = "USERNAME";
            username.Value = this.Username;
            cmd.Parameters.Add(username);

            IDbDataParameter pwhash = cmd.CreateParameter();
            pwhash.ParameterName = "PWHASH";
            pwhash.Value = this.PasswordHash;
            cmd.Parameters.Add(pwhash);

            IDbDataParameter apikey = cmd.CreateParameter();
            apikey.ParameterName = "APIKEY";
            apikey.Value = this.APIKey;
            cmd.Parameters.Add(apikey);
        }

        #endregion

    }
}