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/*
 * Copyright 2016-2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.hardware.platform.mac;

import static oshi.util.Memoizer.memoize;

import java.nio.charset.StandardCharsets;
import java.util.function.Supplier;

import com.sun.jna.Native;
import com.sun.jna.platform.mac.IOKit.IOIterator;
import com.sun.jna.platform.mac.IOKit.IORegistryEntry;
import com.sun.jna.platform.mac.IOKitUtil;

import oshi.annotation.concurrent.Immutable;
import oshi.hardware.common.AbstractFirmware;
import oshi.util.Constants;
import oshi.util.Util;
import oshi.util.tuples.Quintet;

/**
 * Firmware data obtained from ioreg.
 */
@Immutable
final class MacFirmware extends AbstractFirmware {

    private final Supplier> manufNameDescVersRelease = memoize(
            MacFirmware::queryEfi);

    @Override
    public String getManufacturer() {
        return manufNameDescVersRelease.get().getA();
    }

    @Override
    public String getName() {
        return manufNameDescVersRelease.get().getB();
    }

    @Override
    public String getDescription() {
        return manufNameDescVersRelease.get().getC();
    }

    @Override
    public String getVersion() {
        return manufNameDescVersRelease.get().getD();
    }

    @Override
    public String getReleaseDate() {
        return manufNameDescVersRelease.get().getE();
    }

    private static Quintet queryEfi() {
        String manufacturer = null;
        String name = null;
        String description = null;
        String version = null;
        String releaseDate = null;

        IORegistryEntry platformExpert = IOKitUtil.getMatchingService("IOPlatformExpertDevice");
        byte[] data;
        if (platformExpert != null) {
            IOIterator iter = platformExpert.getChildIterator("IODeviceTree");
            if (iter != null) {
                IORegistryEntry entry = iter.next();
                while (entry != null) {
                    switch (entry.getName()) {
                    case "rom":
                        data = entry.getByteArrayProperty("vendor");
                        if (data != null) {
                            manufacturer = Native.toString(data, StandardCharsets.UTF_8);
                        }
                        data = entry.getByteArrayProperty("version");
                        if (data != null) {
                            version = Native.toString(data, StandardCharsets.UTF_8);
                        }
                        data = entry.getByteArrayProperty("release-date");
                        if (data != null) {
                            releaseDate = Native.toString(data, StandardCharsets.UTF_8);
                        }
                        break;
                    case "chosen":
                        data = entry.getByteArrayProperty("booter-name");
                        if (data != null) {
                            name = Native.toString(data, StandardCharsets.UTF_8);
                        }
                        break;
                    case "efi":
                        data = entry.getByteArrayProperty("firmware-abi");
                        if (data != null) {
                            description = Native.toString(data, StandardCharsets.UTF_8);
                        }
                        break;
                    default:
                        if (Util.isBlank(name)) {
                            name = entry.getStringProperty("IONameMatch");
                        }
                        break;
                    }
                    entry.release();
                    entry = iter.next();
                }
                iter.release();
            }
            if (Util.isBlank(manufacturer)) {
                data = platformExpert.getByteArrayProperty("manufacturer");
                if (data != null) {
                    manufacturer = Native.toString(data, StandardCharsets.UTF_8);
                }
            }
            if (Util.isBlank(version)) {
                data = platformExpert.getByteArrayProperty("target-type");
                if (data != null) {
                    version = Native.toString(data, StandardCharsets.UTF_8);
                }
            }
            if (Util.isBlank(name)) {
                data = platformExpert.getByteArrayProperty("device_type");
                if (data != null) {
                    name = Native.toString(data, StandardCharsets.UTF_8);
                }
            }
            platformExpert.release();
        }
        return new Quintet<>(Util.isBlank(manufacturer) ? Constants.UNKNOWN : manufacturer,
                Util.isBlank(name) ? Constants.UNKNOWN : name,
                Util.isBlank(description) ? Constants.UNKNOWN : description,
                Util.isBlank(version) ? Constants.UNKNOWN : version,
                Util.isBlank(releaseDate) ? Constants.UNKNOWN : releaseDate);
    }
}