package net.knarcraft.blacksmith.command;

import net.knarcraft.blacksmith.config.SmithPreset;
import net.knarcraft.blacksmith.config.SmithPresetFilter;
import net.knarcraft.blacksmith.util.TabCompletionHelper;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabCompleter;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

/**
 * The tab-completer for the preset command
 */
public class PresetTabCompleter implements TabCompleter {

    @Nullable
    @Override
    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
                                      @NotNull String[] args) {
        //Only one argument is expected
        if (args.length > 1) {
            return new ArrayList<>();
        }
        //If no preset has been fully matched, tab-complete for presets.
        //If a preset has been fully matched, tab-complete for applicable filters

        String input = args[0].toUpperCase().replace('-', '_');

        List<String> completions = new ArrayList<>();
        String filterString = "";

        if (input.contains(":")) {
            String[] parts = input.split(":");
            input = parts[0];
            filterString = parts.length > 1 ? parts[1] : "";
        }

        //Add tab-completions for all supported filters
        try {
            List<SmithPresetFilter> filters = SmithPreset.valueOf(input).getSupportedFilters();
            for (SmithPresetFilter filter : filters) {
                if (filterString.isEmpty() || filter.name().contains(filterString)) {
                    completions.add(input + ":" + filter.name());
                }
            }
        } catch (IllegalArgumentException ignored) {
            /* An illegal argument exception here simply means that the user has typed an unrecognized smith preset.
               This can be safely ignored, as it simply means no filter tab-completions are necessary. */
        }

        //Adds all default completions
        completions.addAll(TabCompletionHelper.filterMatchingContains(SmithPreset.getPresetNames(), input));
        return completions;
    }

}