using Ophelias.Managers;
using System.Data.SQLite;

namespace Ophelias.Models
{
    internal class Guest
    {
        /*
         * This class represents a guest in the real world.
         * A guest in the eyes of the system is comprised of
         * a unique ID, a first and last name, an email, and
         * payment information. The payment information is optional
         * as they may not specify it at the time or have none readily
         * available.
         */
        internal int Id;
        internal string FirstName;
        internal string LastName;
        internal string Email;
        internal string? CreditCard;
        internal string? CCV;
        internal string? Expiration;

        internal Guest(string FirstName, string LastName, string Email, string? CreditCard = null, string? Expiration = null, string? CCV = null)
        {
            /*
             * This creates a new guest under the assumption that they never existed previously.
             * As a result, this function will create a new entry in the database and generate
             * a unique ID for that customer. These details are then assigned to create a new instance
             * of the guest after the database query is executed. For constraints on Guests, see the Database
             * class.
             */
            int Id;
            using (Database Manager = new()) // Opens a new connection to the database
            {
                using (SQLiteCommand cmd = Manager.con.CreateCommand()) // Creates a new command that will be executed in the database
                {
                    cmd.CommandText = "INSERT INTO guests (Fname, Lname, Email, CreditCard, Expiration, CCV) " +
                                      "VALUES (@Fname, @Lname, @Email, @CreditCard, @Expiry, @CCV);";
                    cmd.Parameters.AddWithValue("@Fname", FirstName);
                    cmd.Parameters.AddWithValue("@Lname", LastName);
                    cmd.Parameters.AddWithValue("@Email", Email);
                    cmd.Parameters.AddWithValue("@CreditCard", CreditCard);
                    cmd.Parameters.AddWithValue("@Expiry", Expiration);
                    cmd.Parameters.AddWithValue("@CCV", CCV);
                    cmd.ExecuteNonQuery();
                }
                Id = (int)Manager.con.LastInsertRowId; // Gets the auto incremented ID of the guest that was just created and assigns it to the guest
            }
            this.Id = Id;
            this.FirstName = FirstName;
            this.LastName = LastName;
            this.Email = Email;
            this.CreditCard = CreditCard;
            this.Expiration = Expiration;
            this.CCV = CCV;
        }
        internal Guest(int Id, string FirstName, string LastName, string Email, string? CreditCard = null, string? Expiration = null, string? CCV = null)
        {
            /*
             * This creates an instance of a guest assuming they already exist as an ID is required.
             */
            this.Id = Id;
            this.FirstName = FirstName;
            this.LastName = LastName;
            this.Email = Email;
            this.CreditCard = CreditCard;
            this.Expiration = Expiration;
            this.CCV = CCV;
        }
        internal void UpdateGuest(int Id, string? FirstName = null, string? LastName = null, string? Email = null, string? CreditCard = null, string? Expiration = null, string? CCV = null)
        {
            /*
             * UpdateGuest provides functionality that enables guests to update their account information.
             * This information is first passed off to the database so the changes can accurately be reflected
             * and then the changes are copied to the existing guest if they are not null. Null changes are considered
             * to be no changes and not an erasure of data.
             */
            using (Database Manager = new()) // Opens a new connection to the database
            {
                using SQLiteCommand cmd = Manager.con.CreateCommand(); // Creates a new command that will be executed in the database
                cmd.CommandText = QueryBuilder.UpdateGuest(Id, FirstName, LastName, Email, CreditCard, Expiration, CCV);
                cmd.Parameters.AddWithValue("@Id", Id);
                cmd.Parameters.AddWithValue("@Fname", FirstName);
                cmd.Parameters.AddWithValue("@Lname", LastName);
                cmd.Parameters.AddWithValue("@Email", Email);
                cmd.Parameters.AddWithValue("@CreditCard", CreditCard);
                cmd.Parameters.AddWithValue("@Expiry", Expiration);
                cmd.Parameters.AddWithValue("@CCV", CCV);
                cmd.ExecuteNonQuery();
            }
            if (FirstName != null)
            {
                this.FirstName = FirstName;
            }

            if (LastName != null)
            {
                this.LastName = LastName;
            }

            if (Email != null)
            {
                this.Email = Email;
            }

            if (CreditCard != null)
            {
                this.CreditCard = CreditCard;
            }
            if (Expiration != null)
            {
                this.Expiration = Expiration;
            }

            if (CCV != null)
            {
                this.CCV = CCV;
            }
        }
    }
}