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Utilities for serialization, commands, noise generation, IO, and some new data types.
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package personthecat.catlib.command;

import com.mojang.brigadier.suggestion.SuggestionProvider;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import personthecat.catlib.command.arguments.JsonArgument;
import personthecat.catlib.command.arguments.PathArgument;
import personthecat.catlib.serialization.json.JsonPath;
import personthecat.catlib.serialization.json.XjsUtils;
import personthecat.catlib.util.LibReference;
import xjs.core.JsonValue;

import java.util.concurrent.CompletableFuture;
import net.minecraft.class_2168;
import net.minecraft.class_2172;
import net.minecraft.class_2321;
import net.minecraft.class_2960;

public class CommandSuggestions {

    /** A suggestion provider suggesting that any value is acceptable. */
    public static final SuggestionProvider ANY_VALUE =
        register("any_suggestion", (ctx, builder) -> suggestAny(builder));

    /** A suggestion provider suggesting that any integer is acceptable. */
    public static final SuggestionProvider ANY_INT =
        register("integer_suggestion", "[]", "-1", "0", "1");

    /** A suggestion provider suggesting that any decimal is acceptable. */
    public static final SuggestionProvider ANY_DECIMAL =
        register("decimal_suggestion", "[]", "0.5", "1.0", "1.5");

    /**
     * A suggestion provider suggesting either the current JSON value or any.
     *
     * Note that this provider requires two previous arguments:
     * 
     *   A {@link JsonArgument} named file
     *   A {@link PathArgument} named path
     * 
     * If the current value is missing, "any value" will be suggested.
     */
    public static final SuggestionProvider CURRENT_JSON =
        register("current_json_suggestion", (ctx, builder) -> {
            final JsonArgument.Result json = CommandUtils.getLastArg(ctx, JsonArgument.class, JsonArgument.Result.class).orElse(null);
            if (json == null) return suggestAny(builder);
            final JsonPath path = CommandUtils.getLastArg(ctx, PathArgument.class, JsonPath.class).orElse(null);
            if (path == null) return suggestAny(builder);
            final JsonValue value = XjsUtils.getValueFromPath(json.json.get(), path).orElse(null);
            if (value == null) return suggestAny(builder);

            if (value.isObject()) return class_2172.method_9253(new String[] { "{ ... }" }, builder);
            if (value.isArray()) return class_2172.method_9253(new String[] { "[ ... ]" }, builder);
            return class_2172.method_9253(new String[] { value.toString() }, builder);
        });

    private static CompletableFuture suggestAny(final SuggestionsBuilder builder) {
        return class_2172.method_9253(new String[] { "[]" }, builder);
    }

    private static SuggestionProvider register(final String name, final String... suggestions) {
        return register(name, (ctx, builder) -> class_2172.method_9253(suggestions, builder));
    }

    private static SuggestionProvider register(final String name, final SuggestionProvider provider) {
        return class_2321.method_10022(new class_2960(LibReference.MOD_ID, name), provider);
    }

}