package co.aikar.util;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Provides Utility methods that assist with generating JSON Objects
 */
@SuppressWarnings({"rawtypes", "SuppressionAnnotation"})
@Deprecated(forRemoval = true)
public final class JSONUtil {
    private JSONUtil() {}

    /**
     * Creates a key/value "JSONPair" object
     *
     * @param key Key to use
     * @param obj Value to use
     * @return JSONPair
     */
    @NotNull
    public static JSONPair pair(@NotNull String key, @Nullable Object obj) {
        return new JSONPair(key, obj);
    }

    @NotNull
    public static JSONPair pair(long key, @Nullable Object obj) {
        return new JSONPair(String.valueOf(key), obj);
    }

    /**
     * Creates a new JSON object from multiple JSONPair key/value pairs
     *
     * @param data JSONPairs
     * @return Map
     */
    @NotNull
    public static Map<String, Object> createObject(@NotNull JSONPair... data) {
        return appendObjectData(new LinkedHashMap(), data);
    }

    /**
     * This appends multiple key/value Obj pairs into a JSON Object
     *
     * @param parent Map to be appended to
     * @param data Data to append
     * @return Map
     */
    @NotNull
    public static Map<String, Object> appendObjectData(@NotNull Map parent, @NotNull JSONPair... data) {
        for (JSONPair JSONPair : data) {
            parent.put(JSONPair.key, JSONPair.val);
        }
        return parent;
    }

    /**
     * This builds a JSON array from a set of data
     *
     * @param data Data to build JSON array from
     * @return List
     */
    @NotNull
    public static List toArray(@NotNull Object... data) {
        return Lists.newArrayList(data);
    }

    /**
     * These help build a single JSON array using a mapper function
     *
     * @param collection Collection to apply to
     * @param mapper Mapper to apply
     * @param <E> Element Type
     * @return List
     */
    @NotNull
    public static <E> List toArrayMapper(@NotNull E[] collection, @NotNull Function<E, Object> mapper) {
        return toArrayMapper(Lists.newArrayList(collection), mapper);
    }

    @NotNull
    public static <E> List toArrayMapper(@NotNull Iterable<E> collection, @NotNull Function<E, Object> mapper) {
        List array = Lists.newArrayList();
        for (E e : collection) {
            Object object = mapper.apply(e);
            if (object != null) {
                array.add(object);
            }
        }
        return array;
    }

    /**
     * These help build a single JSON Object from a collection, using a mapper function
     *
     * @param collection Collection to apply to
     * @param mapper Mapper to apply
     * @param <E> Element Type
     * @return Map
     */
    @NotNull
    public static <E> Map toObjectMapper(@NotNull E[] collection, @NotNull Function<E, JSONPair> mapper) {
        return toObjectMapper(Lists.newArrayList(collection), mapper);
    }

    @NotNull
    public static <E> Map toObjectMapper(@NotNull Iterable<E> collection, @NotNull Function<E, JSONPair> mapper) {
        Map object = Maps.newLinkedHashMap();
        for (E e : collection) {
            JSONPair JSONPair = mapper.apply(e);
            if (JSONPair != null) {
                object.put(JSONPair.key, JSONPair.val);
            }
        }
        return object;
    }

    /**
     * Simply stores a key and a value, used internally by many methods below.
     */
    @SuppressWarnings("PublicInnerClass")
    public static class JSONPair {
        final String key;
        final Object val;

        JSONPair(@NotNull String key, @NotNull Object val) {
            this.key = key;
            this.val = val;
        }
    }
}