using System;
using Common.Properties;
using Microsoft.Win32;


namespace Installer.Common
{
    public static class PreviousInstall
    {
        public static string GetMostRecentlyInstalledSubKeyName(Version installingVersion, out string mostRecentlyInstalledLowerVersion)
        {
            mostRecentlyInstalledLowerVersion = string.Empty;
            var mostRecentlyInstalledSubKeyName = string.Empty;

            var rk = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);
            var sk1 = rk.OpenSubKey(Settings.Default.RegistrySoftwareInstalledProducts);
            var maxProductVersion = new Version(0, 0, 0);
            if (sk1 == null) return string.Empty;
            foreach (var productSubKeyName in sk1.GetSubKeyNames())
            {
                var newKey = sk1.OpenSubKey(productSubKeyName);
                if (newKey == null) continue;
                var newSubKey = newKey.OpenSubKey(Settings.Default.RegistryInstallProperties);
                if (newSubKey == null) continue;
                var val = newSubKey.GetValue(Settings.Default.RegistryDisplayName, -1, RegistryValueOptions.None).ToString();
                if ((val == "-1") || (val != Settings.Default.RegistryDataPRO)) continue;
                var strThisVersion = newSubKey.GetValue(Settings.Default.RegistryDisplayVersion, -1, RegistryValueOptions.None).ToString();
                var thisVersion = new Version(strThisVersion);
                if (thisVersion.IsGreaterThan(maxProductVersion) && thisVersion.IsLessThan(installingVersion))
                {
                    maxProductVersion = thisVersion;
                    mostRecentlyInstalledLowerVersion = thisVersion.ToString();
                    mostRecentlyInstalledSubKeyName = productSubKeyName;
                }
            }
            return mostRecentlyInstalledSubKeyName;
        }
        public static bool IsGreaterThan(this Version leftString, Version rightString)
        {
            return leftString.CompareTo(rightString) > 0;
        }
        public static bool IsLessThan(this Version leftString, Version rightString)
        {
            return leftString.CompareTo(rightString) < 0;
        }
        public static string GetMostRecentlyInstalledPath(string mostRecentlyInstalledSubKeyName)
        {
            var log = new System.Diagnostics.EventLog();
            log.Source = "DataPROInstaller";

            var mostRecentlyInstalledPath = string.Empty;

            var rk = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);

            //Look first in Products
            var sk1 = rk.OpenSubKey(Settings.Default.RegistrySoftwareInstalledProducts);
            if (sk1 != null)
            {
                log.WriteEntry("Looking in Products");
                foreach (var productSubKeyName in sk1.GetSubKeyNames())
                {
                    if (productSubKeyName != mostRecentlyInstalledSubKeyName) continue;
                    var newKey = sk1.OpenSubKey(productSubKeyName);
                    if (newKey == null) continue;
                    newKey = newKey.OpenSubKey(Settings.Default.RegistryInstallProperties);
                    if (newKey == null) continue;
                    var val = newKey.GetValue(Settings.Default.RegistryInstallLocation, -1, RegistryValueOptions.None).ToString();
                    if ((val == "-1") || (string.IsNullOrWhiteSpace(val))) continue;
                    mostRecentlyInstalledPath = val;
                    if (mostRecentlyInstalledPath.Contains(Settings.Default.DTSSuite))
                    {
                        mostRecentlyInstalledPath += Settings.Default.RegistryDataPRO + "\\";
                    }
                    log.WriteEntry("GetMostRecentlyInstalledPath returned " + mostRecentlyInstalledPath + " from Products");
                    return mostRecentlyInstalledPath;
                }
            }
            //Look in Components
            log.WriteEntry("Looking in Components");
            sk1 = rk.OpenSubKey(Settings.Default.RegistrySoftwareInstalledComponents);
            if (sk1 == null) return string.Empty;
            foreach (var productSubKeyName in sk1.GetSubKeyNames())
            {
                var newKey = sk1.OpenSubKey(productSubKeyName);
                if (newKey == null) continue;
                var val = newKey.GetValue(mostRecentlyInstalledSubKeyName, -1, RegistryValueOptions.None).ToString();
                if ((val == "-1") || (!val.EndsWith(Settings.Default.RegistryDataPROExeConfig))) continue;
                mostRecentlyInstalledPath = val.Substring(0, val.Length - Settings.Default.RegistryDataPROExeConfig.Length);
                if (mostRecentlyInstalledPath.Contains(Settings.Default.DTSSuite))
                {
                    mostRecentlyInstalledPath += Settings.Default.RegistryDataPRO + "\\";
                }
                log.WriteEntry("GetMostRecentlyInstalledPath returned " + mostRecentlyInstalledPath + " from Components");
                return mostRecentlyInstalledPath;
            }

            log.WriteEntry("GetMostRecentlyInstalledPath returned " + mostRecentlyInstalledPath);
            return mostRecentlyInstalledPath;
        }
    }
}