using System;
using System.Linq;
using Xylem.Common.Hardware.WaterMeter.Genesis.GenesisCore;
using Xylem.Common.Hardware.WaterMeter.Genesis.GenesisCore.Consts;

namespace Xylem.Common.Hardware.WaterMeter.Genesis.GenesisFile
{
    /// <summary>
    /// Update capability check for all necessary settings according to meter.
    /// </summary>
    public static class MeterFwUpdateCapability
    {
        /// <summary>
        /// Checks if the metrology upgrade is allowed or the version is already installed.
        /// The application description file "ADF" has to be read in advance as this contains the "GENSISFLOW" version.
        /// </summary>
        /// <param name="meterFwUpdate"></param>
        /// <param name="currentGenesis">the current Genesis</param>
        /// <returns>true if upgrade is allowed or the metrology version is up-to-date</returns>
        /// <remarks date="2021-Jan-14" author="Thomas Wiedebusch">
        /// - Initial.
        /// </remarks>
        /// <remarks date="2021-Jan-27" author="Thomas Wiedebusch">
        /// - Removed upgrade permission 0 check.
        /// </remarks>
        public static Boolean CheckMetrology(MeterFwUpdate meterFwUpdate, IGenesisMeter currentGenesis)
        {
            if (meterFwUpdate == null || currentGenesis == null) return false;
            
            // if the update is allowed, a version check is not needed
            if (currentGenesis.MetrologyUpgradePermission == MetrologyDefinition.MetrologyUpgradePermitted) return true;

            // extract the metrology version and CRC from the Genesis meter.
            var installedMetrology = 
                currentGenesis.MeterAppListVersion.FirstOrDefault(im => im.AppName == MetrologyDefinition.MetrologyName);
            
            // extract version and CRC from the ADF, ATTENTION the AppName is not det here, so check for AppId!
            var requiredMetrology = meterFwUpdate.FileApps.FirstOrDefault(rm => installedMetrology != null && 
                rm.AppId == installedMetrology.AppId);
            
            // if the installed version equals the required version the update is allowed
            return requiredMetrology != null && installedMetrology != null && 
                   installedMetrology.Version == requiredMetrology.Version && 
                   installedMetrology.Crc == requiredMetrology.Crc;
        }

        /// <summary>
        /// Checks if the core version is in range of required minimum to maximum version.
        /// The package file has to be read in advance as this contains the min/max.
        /// </summary>
        /// <param name="meterFwUpdate"></param>
        /// <param name="coreRevision">containing the core version</param>
        /// <returns>true if version is in range</returns>
        /// <remarks date="2020-Dec-08" author="Thomas Wiedebusch">
        /// - Initial.
        /// </remarks>
        /// <remarks date="2022-Dec-05" author="Thomas Wiedebusch">
        /// - Core revision data type changed from string ti int32?.
        /// </remarks>
        public static Boolean CheckCoreRevision(MeterFwUpdate meterFwUpdate, Int32? coreRevision)
        {
            if (coreRevision == null || meterFwUpdate == null ) return false;
            return meterFwUpdate.CheckCoreRevision(coreRevision);
        }
    }
}