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package com.javonet.core.handler;

import com.javonet.utils.Command;

import java.util.Arrays;
import java.util.Dictionary;
import java.util.List;
import java.util.Map;

public class ArrayGetItemHandler extends AbstractHandler {
    @Override
    Object process(Command command) throws Exception {
        if (command.getPayload()[0] instanceof Object[]) {
            return getArrayElement(command);
        } else if (command.getPayload()[0] instanceof List) {
            return getListElement(command);
        } else if (command.getPayload()[0] instanceof Map) {
            return getMapElement(command);
        } else if (command.getPayload()[0] instanceof Dictionary) {
            return getDictionaryElement(command);
        } else {
            throw new Exception(String.format("Cannot get element from %s", command.getPayload()[0]));
        }
    }

    private Object getArrayElement(Command command) throws Exception {
        Object[] indexes = Arrays.stream(command.getPayload()).skip(1).toArray();
        Object[] indexes_copy = new Object[] {};
        if (indexes[0] instanceof Object[]) {
            indexes_copy = new Object[((Object[]) indexes[0]).length];
            System.arraycopy(((Object[]) indexes[0]), 0, indexes_copy, 0, ((Object[]) indexes[0]).length);
        } else {
            indexes_copy = indexes;
        }
        switch (indexes_copy.length) {
            case 1:
                return ((Object[]) command.getPayload()[0])[(Integer) indexes_copy[0]];
            case 2:
                return ((Object[][]) command.getPayload()[0])[(Integer) indexes_copy[0]][(Integer) indexes_copy[1]];
            case 3:
                return ((Object[][][]) command.getPayload()[0])[(Integer) indexes_copy[0]][(Integer) indexes_copy[1]][(Integer) indexes_copy[2]];
            default:
                throw new Exception(String.format("Cannot get element from %s", command.getPayload()[0]));
        }
    }

    private Object getListElement(Command command) {
        List list = (List) command.getPayload()[0];
        Integer index = (Integer) command.getPayload()[1];

        return list.get(index);
    }

    private Object getMapElement(Command command) {
        Map map = (Map) command.getPayload()[0];
        Object key = command.getPayload()[1];

        return map.get(key);
    }

    private Object getDictionaryElement(Command command) {
        Dictionary dict = (Dictionary) command.getPayload()[0];
        Object key = command.getPayload()[1];

        return dict.get(key);
    }


}