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package io.vertx.up.extension.pointer;

import io.vertx.core.Future;
import io.vertx.core.json.JsonObject;
import io.vertx.up.commune.Envelop;
import io.vertx.up.log.Annal;
import io.vertx.up.uca.yaml.Node;
import io.vertx.up.uca.yaml.ZeroUniform;
import io.vertx.up.unity.Ux;
import io.vertx.up.util.Ut;

import java.util.Objects;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;

/*
 * Default package scope tool for extension.
 */
class Plugin {

    private static transient final Node UNIFORM = Ut.singleton(ZeroUniform.class);
    private static transient final JsonObject PLUGIN_CONFIG = new JsonObject();
    private static final Annal LOGGER = Annal.get(Plugin.class);

    /*
     * I/O read for config loading.
     */
    static {
        final JsonObject uniform = UNIFORM.read();
        if (uniform.containsKey("extension")) {
            final JsonObject pluginConfig = uniform.getJsonObject("extension");
            if (Objects.nonNull(pluginConfig)) {
                PLUGIN_CONFIG.mergeIn(pluginConfig);
            }
        }
    }

    static void mountPlugin(final String key, final BiConsumer, JsonObject> consumer) {
        mountPlugin(key, null, (pluginCls, config) -> {
            consumer.accept(pluginCls, config);
            return Ux.future(Envelop.ok());
        });
    }

    static Future mountPlugin(
        final String key,
        /* No plugin, returned original Future */
        final Envelop envelop,
        /* Internal function for generation of Envelop */
        final BiFunction, JsonObject, Future> function) {
        if (PLUGIN_CONFIG.containsKey(key)) {
            final JsonObject metadata = PLUGIN_CONFIG.getJsonObject(key);
            final Class pluginCls = Ut.clazz(metadata.getString("component"));
            if (Objects.nonNull(pluginCls)) {
                final JsonObject config = metadata.getJsonObject("config");
                try {
                    return function.apply(pluginCls, config);
                } catch (final Throwable ex) {
                    ex.printStackTrace();
                    LOGGER.warn("Plugin Extension Failure: {0}, class = {1}", ex.getMessage(), pluginCls);
                    return Ux.future(envelop);
                }
            }
        }
        return Ux.future(envelop);
    }
}