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/*
 * Copyright 2025 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.driver.windows.registry;

import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinReg;
import oshi.software.os.ApplicationInfo;
import oshi.util.ParseUtil;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Arrays;

public final class InstalledAppsData {
    private InstalledAppsData() {
    }

    private static final Map> REGISTRY_PATHS = new HashMap<>();

    static {
        REGISTRY_PATHS.put(WinReg.HKEY_LOCAL_MACHINE,
                Arrays.asList("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall",
                        "SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall"));

        REGISTRY_PATHS.put(WinReg.HKEY_CURRENT_USER,
                Arrays.asList("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall"));
    }

    public static List queryInstalledApps() {
        List appInfoList = new ArrayList<>();

        // Iterate through both HKLM and HKCU paths
        for (Map.Entry> entry : REGISTRY_PATHS.entrySet()) {
            WinReg.HKEY rootKey = entry.getKey();
            List uninstallPaths = entry.getValue();

            for (String registryPath : uninstallPaths) {
                String[] keys = Advapi32Util.registryGetKeys(rootKey, registryPath);

                for (String key : keys) {
                    String fullPath = registryPath + "\\" + key;
                    try {
                        String name = getRegistryValueOrUnknown(rootKey, fullPath, "DisplayName");
                        String version = getRegistryValueOrUnknown(rootKey, fullPath, "DisplayVersion");
                        String publisher = getRegistryValueOrUnknown(rootKey, fullPath, "Publisher");
                        String installDate = getRegistryValueOrUnknown(rootKey, fullPath, "InstallDate");
                        String installLocation = getRegistryValueOrUnknown(rootKey, fullPath, "InstallLocation");
                        String installSource = getRegistryValueOrUnknown(rootKey, fullPath, "InstallSource");

                        long installDateEpoch = ParseUtil.parseDateToEpoch(installDate, "yyyyMMdd");

                        Map additionalInfo = new HashMap<>();
                        additionalInfo.put("installLocation", installLocation);
                        additionalInfo.put("installSource", installSource);

                        ApplicationInfo app = new ApplicationInfo(name, version, publisher, installDateEpoch,
                                additionalInfo);

                        appInfoList.add(app);
                    } catch (Win32Exception e) {
                        // Skip keys that are inaccessible or have missing values
                    }
                }
            }
        }

        return appInfoList;
    }

    private static String getRegistryValueOrUnknown(WinReg.HKEY rootKey, String path, String key) {
        String value = Advapi32Util.registryGetStringValue(rootKey, path, key);
        return ParseUtil.getStringValueOrUnknown(value);
    }
}