using System;
using System.Collections.Generic;
using System.Linq;
using Wayne.ForecourtControl.Fusion.ReadDeviceStatus;
using Wayne.Lib;

namespace Wayne.ForecourtControl.Fusion
{
    public static class ConfigurationSetExtensions
    {
        /// <summary>
        /// Returns a list of pump numbers from the given configuration set
        /// </summary>
        /// <param name="configurationSet"></param>
        /// <returns></returns>
        public static int[] PumpNumbers(this ConfigurationSet configurationSet)
        {
            return configurationSet.DspConfiguration.FDCdata.
                WhereNotNull()
                .SelectMany(x => x.DeviceClass.WhereNotNull())
                .Select(x => Strings.ParseInt(x.DeviceID))
                .Where(x => x.HasValue)
                .Select(x => x.Value)
                .ToArray();
        }

        /// <summary>
        /// Returns an array of strings the denormalized nozzle information 
        /// containing pumpnumber|nozzlenumber|productnumber|Tank1|Tank2 from the given configurationset.
        /// </summary>
        /// <param name="configurationSet"></param>
        /// <returns></returns>
        public static IEnumerable<string> NozzleSetup(this ConfigurationSet configurationSet)
        {
            foreach (var deviceClassDsp in configurationSet.DspConfiguration.FDCdata
                .WhereNotNull()
                .SelectMany(x => x.DeviceClass.WhereNotNull()))
            {
                foreach (var deviceClassFp in deviceClassDsp.DeviceClass.WhereNotNull())
                {
                    foreach (var nozzle in deviceClassFp.FPNozzle.WhereNotNull())
                    {
                        foreach (var product in nozzle.FPProductId)
                        {
                            yield return string.Join("|",
                                new []{deviceClassDsp.DeviceID,
                                nozzle.FPNozzleNo,
                                product.PIFPProductNo,
                                product.PIFPTankNo1,
                                product.PIFPTankNo2});
                        }
                    }
                }
            }
        }

        /// <summary>
        /// Returns an enumerable of the product numbers in the supplied configuration set.
        /// </summary>
        /// <param name="configurationSet"></param>
        /// <returns></returns>
        public static IEnumerable<int> ProductNumbers(this ConfigurationSet configurationSet)
        {
            return configurationSet.ProductTable.FDCdata
                .WhereNotNull()
                .SelectMany(x => x.FuelProducts.WhereNotNull())
                .SelectMany(x => x.Product.WhereNotNull())
                .Select(x => Strings.ParseInt(x.ProductNo))
                .Where(x => x.HasValue)
                .Select(x => x.Value)
                .ToArray();
        }
    }
}