package top.sunsetlab.utils;

import com.google.gson.Gson;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.entity.Player;
import top.sunsetlab.PluginMain;
import top.sunsetlab.actions.ActionParam;
import top.sunsetlab.actions.IActionBase;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;

class ActionData {
    String id;
    String classname;
    boolean sync;
}

/**
 * Json定义的动作
 */
public class JsonAction {
    private final ActionData data;

    /**
     * 构造器
     * @param location 资源文件(json)的位置
     */
    public JsonAction(String location) {
        InputStream is = JsonAction.class.getResourceAsStream("/" + location);
        if (is == null) {
            throw new RuntimeException(location + " not found");
        }
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        Gson gson = new Gson();
        data = gson.fromJson(br, ActionData.class);
    }

    /**
     * 调用动作
     * @param location 调用位置
     * @param caller 执行者
     * @return 动作是否成功运行，sync动作始终为true
     */
    public boolean run(Location location, Player caller, ActionParam param) {
        try {
            // 通过反射加载动作类
            Class<?> clazz = Class.forName(data.classname);
            if (!IActionBase.class.isAssignableFrom(clazz)) {
                throw new RuntimeException(data.classname + " is not a Action");
            }
            // 获取构造器
            Constructor<?> constructor = clazz.getConstructor();
            IActionBase action = (IActionBase) constructor.newInstance();

            ActionParam p = param == null ? new ActionParam(new HashMap<>()): param;
            if (data.sync) {
                // 在Minecraft线程内执行，一般用于世界交互
                Bukkit.getScheduler().runTask(PluginMain.plugin, () -> {
                    action.call(location, caller, p);
                });
                return true;
            }else {
                // 异步执行
                return action.call(location, caller, p);
            }
        }catch (ClassNotFoundException
                | NoSuchMethodException
                | SecurityException
                | InstantiationException
                | IllegalAccessException
                | IllegalArgumentException
                | InvocationTargetException e) {
            throw new RuntimeException(
                    "Something went wrong while trying to run action " + data.id + ":",
                    e);
        }
    }

    /**
     * 获取动作id
     * @return 动作id
     */
    public String getId() {
        return data.id;
    }
}