package com.craftbank.commands;

import com.craftbank.CraftBank;
import com.craftbank.economy.EconomyManager;
import com.craftbank.util.Amounts;
import com.craftbank.util.Msg;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabExecutor;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * /cheque <金额> —— 将现金具现化为一张实体支票。
 *
 * <p>流程：异步扣除现金 → 切回玩家区域线程生成并发放支票物品。背包满时退款，
 * 避免吞钱。</p>
 */
public final class ChequeCommand implements TabExecutor {

    private final CraftBank plugin;
    private final Msg msg;

    public ChequeCommand(CraftBank plugin) {
        this.plugin = plugin;
        this.msg = new Msg(plugin);
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (!(sender instanceof Player player)) {
            msg.key(sender, "player-only", "&c该指令只能由玩家执行。");
            return true;
        }
        if (args.length < 1) {
            msg.raw(sender, "&c用法: /cheque <金额>");
            return true;
        }
        double amount = Amounts.parse(args[0]);
        if (amount <= 0) {
            msg.key(sender, "invalid-amount", "&c请输入一个有效的正数金额。");
            return true;
        }

        EconomyManager econ = plugin.getEconomyManager();

        plugin.runAsync(() -> {
            econ.loadBlocking(player.getUniqueId(), player.getName(), true);
            if (!econ.withdraw(player.getUniqueId(), amount)) {
                msg.key(sender, "insufficient-funds", "&c余额不足。");
                return;
            }
            // 物品操作必须回到玩家所在区域线程。
            plugin.runForPlayer(player, () -> {
                ItemStack cheque = plugin.getChequeManager()
                        .createCheque(player.getUniqueId(), player.getName(), amount);
                Map<Integer, ItemStack> leftover = player.getInventory().addItem(cheque);
                if (!leftover.isEmpty()) {
                    // 背包放不下: 异步退款。
                    plugin.runAsync(() -> {
                        econ.deposit(player.getUniqueId(), amount);
                        msg.raw(player, "&c背包已满, 无法生成支票, 金额已退回。");
                    });
                    return;
                }
                msg.raw(player, "&a已开具一张面额 &f" + econ.format(amount) + " &a的支票。");
            });
        });
        return true;
    }

    @Override
    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
        return Collections.emptyList();
    }
}