package net.knarcraft.blacksmith.command;

import net.citizensnpcs.api.CitizensAPI;
import net.citizensnpcs.api.npc.NPC;
import net.knarcraft.blacksmith.BlacksmithPlugin;
import net.knarcraft.blacksmith.config.NPCSetting;
import net.knarcraft.blacksmith.config.SettingValueType;
import net.knarcraft.blacksmith.formatting.StringFormatter;
import net.knarcraft.blacksmith.formatting.TranslatableMessage;
import net.knarcraft.blacksmith.formatting.Translator;
import net.knarcraft.blacksmith.trait.BlacksmithTrait;
import net.knarcraft.blacksmith.util.InputParsingHelper;
import net.knarcraft.blacksmith.util.TypeValidationHelper;
import net.md_5.bungee.api.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.jetbrains.annotations.NotNull;

import java.util.Arrays;

import static net.knarcraft.blacksmith.formatting.StringFormatter.displaySuccessMessage;
import static net.knarcraft.blacksmith.formatting.TranslatableMessage.getCurrentValueMessage;
import static net.knarcraft.blacksmith.formatting.TranslatableMessage.getValueChangedMessage;

/**
 * The main command used for blacksmith editing
 */
public class BlackSmithEditCommand implements CommandExecutor {

    @Override
    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
                             @NotNull String[] args) {
        NPC npc = CitizensAPI.getDefaultNPCSelector().getSelected(sender);
        if (npc == null || !npc.hasTrait(BlacksmithTrait.class)) {
            StringFormatter.displayErrorMessage(sender, TranslatableMessage.NO_NPC_SELECTED);
            return true;
        }

        if (args.length < 1) {
            return false;
        }

        BlacksmithTrait blacksmithTrait = npc.getTraitNullable(BlacksmithTrait.class);

        for (NPCSetting npcSetting : NPCSetting.values()) {
            String commandName = npcSetting.getCommandName();
            if (commandName.equalsIgnoreCase(args[0])) {
                String newValue = args.length < 2 ? null : args[1];
                //This makes sure all arguments are treated as a sentence
                if (npcSetting.getValueType() == SettingValueType.STRING && args.length > 2) {
                    newValue = String.join(" ", Arrays.asList(args).subList(1, args.length));
                }
                return displayOrChangeNPCSetting(blacksmithTrait, npcSetting, newValue, sender);
            }
        }
        return false;
    }

    /**
     * Changes the given NPC setting, or displays the current value if a new value isn't specified
     *
     * @param blacksmithTrait <p>The blacksmith trait belonging to the selected NPC</p>
     * @param npcSetting      <p>The NPC setting to change</p>
     * @param newValue        <p>The value to change the setting to</p>
     * @param sender          <p>The command sender to notify about results</p>
     * @return <p>True if everything went successfully</p>
     */
    private boolean displayOrChangeNPCSetting(BlacksmithTrait blacksmithTrait, NPCSetting npcSetting, String newValue,
                                              CommandSender sender) {
        if (newValue == null) {
            //Display the current value of the setting
            displayNPCSetting(blacksmithTrait, npcSetting, sender);
        } else {
            //If an empty value or null, clear the value instead of changing it
            if (InputParsingHelper.isEmpty(newValue)) {
                newValue = null;
            } else {
                //Abort if an invalid value is given
                boolean isValidType = TypeValidationHelper.isValid(npcSetting.getValueType(), newValue, sender);
                if (!isValidType) {
                    return false;
                }
                newValue = ChatColor.translateAlternateColorCodes('&', newValue);
            }

            //Change the setting
            blacksmithTrait.getSettings().changeSetting(npcSetting, newValue);
            displaySuccessMessage(sender, getValueChangedMessage(npcSetting.getCommandName(), String.valueOf(newValue)));
            //Save the changes immediately to prevent data loss on server crash
            CitizensAPI.getNPCRegistry().saveToStore();
        }
        return true;
    }

    /**
     * Displays the current value of the given NPC setting
     *
     * @param blacksmithTrait <p>The blacksmith trait of the NPC to get the value from</p>
     * @param npcSetting      <p>The NPC setting to see the value of</p>
     * @param sender          <p>The command sender to display the value to</p>
     */
    private void displayNPCSetting(BlacksmithTrait blacksmithTrait, NPCSetting npcSetting, CommandSender sender) {
        String rawValue = String.valueOf(blacksmithTrait.getSettings().getRawValue(npcSetting));
        if (InputParsingHelper.isEmpty(rawValue)) {
            //Display the default value, if no custom value has been specified
            rawValue = String.valueOf(BlacksmithPlugin.getInstance().getSettings().getRawValue(npcSetting));
            displaySuccessMessage(sender, getCurrentValueMessage(npcSetting.getCommandName(), rawValue));
        } else {
            //Add a marker if the value has been customized
            String marker = Translator.getTranslatedMessage(TranslatableMessage.SETTING_OVERRIDDEN_MARKER);
            displaySuccessMessage(sender, getCurrentValueMessage(npcSetting.getCommandName(), rawValue) + marker);
        }
        if (npcSetting.getPath().startsWith("defaults.messages")) {
            sender.sendMessage(TranslatableMessage.getRawValueMessage(rawValue.replace(ChatColor.COLOR_CHAR, '&')));
        }
    }

}