package com.ruoyi.device.registry;

import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import com.ruoyi.device.api.DeviceAdapter;

/** 管理启用设备适配器的运行时实例及其会话生命周期。 */
public final class DeviceAdapterRegistry implements AutoCloseable
{
    private final Map<String, DeviceAdapterFactory> factories = new HashMap<>();
    private final Map<String, RegisteredAdapter> adapters = new HashMap<>();

    public DeviceAdapterRegistry(List<DeviceAdapterFactory> factories)
    {
        Objects.requireNonNull(factories, "factories").forEach(factory -> {
            String type = normalizeType(factory.adapterType());
            if (this.factories.put(type, factory) != null)
                throw new IllegalArgumentException("Duplicate device adapter factory: " + type);
        });
    }

    /** 按持久化配置注册、替换或移除运行时实例。 */
    public synchronized void synchronize(AdapterInstanceConfig config)
    {
        Objects.requireNonNull(config, "config");
        if (!config.enabled())
        {
            remove(config.adapterCode());
            return;
        }

        RegisteredAdapter current = adapters.get(config.adapterCode());
        if (current != null && current.config().equals(config)) return;

        DeviceAdapterFactory factory = factories.get(normalizeType(config.adapterType()));
        if (factory == null) throw new AdapterRegistryException("Unsupported device adapter type: " + config.adapterType());

        DeviceAdapter replacement = factory.create(config);
        RegisteredAdapter previous = adapters.put(config.adapterCode(), new RegisteredAdapter(config, replacement));
        if (previous != null) previous.adapter().close();
    }

    /** 返回已启用适配器；未注册时给出可识别失败。 */
    public synchronized DeviceAdapter require(String adapterCode)
    {
        RegisteredAdapter registered = adapters.get(adapterCode);
        if (registered == null) throw new AdapterRegistryException("Device adapter is not enabled: " + adapterCode);
        return registered.adapter();
    }

    public synchronized boolean contains(String adapterCode)
    {
        return adapters.containsKey(adapterCode);
    }

    @Override
    public synchronized void close()
    {
        adapters.values().forEach(registered -> registered.adapter().close());
        adapters.clear();
    }

    private void remove(String adapterCode)
    {
        RegisteredAdapter previous = adapters.remove(adapterCode);
        if (previous != null) previous.adapter().close();
    }

    private static String normalizeType(String value)
    {
        return Objects.requireNonNull(value, "adapterType").trim().toUpperCase(Locale.ROOT);
    }

    private record RegisteredAdapter(AdapterInstanceConfig config, DeviceAdapter adapter)
    {
    }
}