using MistoxWebsite.Shared;
using MySql.Data.MySqlClient;
using System.Data;
using System.Data.Common;

// Account inventory needs to know whether there is already an object with the specified PK before making a new item
// If item exists already update the one that already exists

namespace MistoxWebsite.Server.Services.DatabaseService {
    public partial class DatabaseService {

        public async Task<List<UserInventory>> GetInventory( Account account, Product product ) {
            List<UserInventory> list = new List<UserInventory>();
            using( MySqlConnection connection = GetConnection() ) {
                connection.Open();
                string command = @"
                SELECT * FROM AccountInventory
                WHERE AccountID = @AccountID AND ProductID = @ProductID;
                ";

                MySqlCommand cmd = new MySqlCommand(command, connection);
                cmd.Parameters.AddWithValue("@AccountID", account.ID);
                cmd.Parameters.AddWithValue("@ProductID", product.ID);

                using( DbDataReader reader = await cmd.ExecuteReaderAsync() ) {
                    while( await reader.ReadAsync() ) {
                        if( reader == null ) {
                            break;
                        }

                        string _item = reader.GetString("Item");
                        int _quantity = reader.GetInt32("Quantity");
                        string _stats = reader.GetString("Stats");

                        list.Add( new UserInventory() {
                            Item = _item,
                            Quantity = _quantity,
                            Stats = _stats
                        } );
                    }
                }
            }
            return list;
        }

        async Task UpdateInventory( MySqlConnection connection, AccountInventory item ) {
            string command = @"
            UPDATE AccountInventory
            SET AccountID = @AccountID,
            ProductID = @ProductID,
            Item = @Item,
            Quantity = @Quantity,
            Stats = @Stats
            WHERE (AccountID = @AccountID AND ProductID = @ProductID AND Item = @Item);
            ";

            MySqlCommand cmd = new MySqlCommand(command, connection);
            cmd.Parameters.AddWithValue("@AccountID", item.AccountID);
            cmd.Parameters.AddWithValue("@ProductID", item.ProductID);
            cmd.Parameters.AddWithValue("@Item", item.Item);
            cmd.Parameters.AddWithValue("@Quantity", item.Quantity);
            cmd.Parameters.AddWithValue("@Stats", item.Stats);

            await cmd.ExecuteNonQueryAsync();
        }

        async Task NewInventory( MySqlConnection connection, AccountInventory item ) {
            string command = @"
            INSERT INTO AccountInventory (AccountID, ProductID, Item, Quantity, Stats)
            VALUES
            (@AccountID, @ProductID, @Item, @Quantity, @Stats);
            ";

            MySqlCommand cmd = new MySqlCommand( command , connection);
            cmd.Parameters.AddWithValue("@AccountID", item.AccountID);
            cmd.Parameters.AddWithValue("@ProductID", item.ProductID);
            cmd.Parameters.AddWithValue("@Item", item.Item);
            cmd.Parameters.AddWithValue("@Quantity", item.Quantity);
            cmd.Parameters.AddWithValue("@Stats", item.Stats);

            await cmd.ExecuteNonQueryAsync();
        }

        // Test to see if reader read does what its supposed to
        // Not fully implimented
        public async Task SetInventory( Account account, Product game, List<UserInventory> Item ) {
            using( MySqlConnection connection = GetConnection() ) {
                connection.Open();
                foreach( UserInventory item in Item ) {
                    bool exists = false;
                    MySqlCommand cmd = new MySqlCommand("SELECT * FROM AccountInventory WHERE AccountID = '" + account.ID + "' AND ProductID = '" + game.ID + "' AND Item = '" + item.Item.ToLower() + "'", connection);
                    using( DbDataReader reader = await cmd.ExecuteReaderAsync() ) {
                        exists = reader.HasRows;
                    }
                    if( exists ) {
                        await UpdateInventory( connection, new AccountInventory() {
                            AccountID = account.ID,
                            ProductID = game.ID,
                            Item = item.Item,
                            Quantity = item.Quantity,
                            Stats = item.Stats
                        } );
                    } else {
                        await NewInventory( connection, new AccountInventory() {
                            AccountID = account.ID,
                            ProductID = game.ID,
                            Item = item.Item,
                            Quantity = item.Quantity,
                            Stats = item.Stats
                        } );
                    }
                }
            }
        }
    }
}