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.Bukkit;
import org.bukkit.OfflinePlayer;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabExecutor;

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

/**
 * /bankadmin <reload|give|take|set|setinterest> —— 管理员指令。
 */
public final class BankAdminCommand implements TabExecutor {

    private final CraftBank plugin;
    private final Msg msg;

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

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (!sender.hasPermission("craftbank.admin")) {
            msg.key(sender, "no-permission", "&c你没有权限执行该操作。");
            return true;
        }
        if (args.length == 0) {
            sendHelp(sender);
            return true;
        }

        switch (args[0].toLowerCase()) {
            case "reload" -> {
                plugin.reloadConfig();
                plugin.getEconomyManager().reload();
                msg.key(sender, "reload-success", "&a配置文件已重载。");
            }
            case "give" -> modify(sender, args, ModifyType.GIVE);
            case "take" -> modify(sender, args, ModifyType.TAKE);
            case "set" -> modify(sender, args, ModifyType.SET);
            case "setinterest" -> setInterest(sender, args);
            case "log" -> queryLog(sender, args);
            default -> sendHelp(sender);
        }
        return true;
    }

    private enum ModifyType {
        GIVE, TAKE, SET
    }

    private void modify(CommandSender sender, String[] args, ModifyType type) {
        if (args.length < 3) {
            msg.raw(sender, "&c用法: /bankadmin " + type.name().toLowerCase() + " <玩家> <金额>");
            return;
        }
        double amount = Amounts.parse(args[2]);
        if (amount < 0 || (type != ModifyType.SET && amount <= 0)) {
            msg.key(sender, "invalid-amount", "&c请输入一个有效的正数金额。");
            return;
        }
        String targetName = args[1];
        EconomyManager econ = plugin.getEconomyManager();

        plugin.runAsync(() -> {
            @SuppressWarnings("deprecation")
            OfflinePlayer target = Bukkit.getOfflinePlayer(targetName);
            UUID uuid = target.getUniqueId();
            if (uuid == null || (!target.hasPlayedBefore() && !target.isOnline())) {
                msg.key(sender, "player-not-found", "&c找不到目标玩家。");
                return;
            }
            econ.loadBlocking(uuid, target.getName(), true);
            boolean ok;
            switch (type) {
                case GIVE -> ok = econ.deposit(uuid, amount);
                case TAKE -> ok = econ.withdraw(uuid, amount);
                case SET -> ok = econ.set(uuid, amount);
                default -> ok = false;
            }
            if (!ok) {
                msg.raw(sender, "&c操作失败 (可能是余额不足)。");
                return;
            }
            com.craftbank.model.Transaction.Type txType = switch (type) {
                case GIVE -> com.craftbank.model.Transaction.Type.ADMIN_GIVE;
                case TAKE -> com.craftbank.model.Transaction.Type.ADMIN_TAKE;
                case SET -> com.craftbank.model.Transaction.Type.ADMIN_SET;
            };
            plugin.getTransactionLog().record(uuid, txType, amount,
                    "管理员 " + sender.getName() + " 操作");
            msg.raw(sender, "&a已" + label(type) + " &f" + targetName + " &a现金 " + econ.format(amount)
                    + " &7(当前: " + econ.format(econ.getCash(uuid)) + ")");
        });
    }

    private String label(ModifyType type) {
        return switch (type) {
            case GIVE -> "给予";
            case TAKE -> "扣除";
            case SET -> "设置";
        };
    }

    private void setInterest(CommandSender sender, String[] args) {
        if (args.length < 3) {
            msg.raw(sender, "&c用法: /bankadmin setinterest <savings|term_7d|term_15d|term_30d> <利率>");
            return;
        }
        String key = args[1].toLowerCase();
        List<String> valid = List.of("savings", "term_7d", "term_15d", "term_30d");
        if (!valid.contains(key)) {
            msg.raw(sender, "&c利率类型无效, 可选: " + String.join(", ", valid));
            return;
        }
        double rate;
        try {
            rate = Double.parseDouble(args[2]);
        } catch (NumberFormatException ex) {
            msg.raw(sender, "&c请输入一个有效的利率 (例如 0.005)。");
            return;
        }
        if (!Double.isFinite(rate) || rate < 0) {
            msg.raw(sender, "&c利率必须为非负数。");
            return;
        }
        plugin.getConfig().set("Interest_Rates." + key, rate);
        plugin.saveConfig();
        msg.raw(sender, "&a已将 &f" + key + " &a的日利率设置为 &e" + rate + " &7(" + (rate * 100) + "%)");
    }

    private void queryLog(CommandSender sender, String[] args) {
        if (args.length < 2) {
            msg.raw(sender, "&c用法: /bankadmin log <玩家> [页码]");
            return;
        }
        String targetName = args[1];
        int page = 1;
        if (args.length >= 3) {
            try {
                page = Math.max(1, Integer.parseInt(args[2]));
            } catch (NumberFormatException ignored) {
                page = 1;
            }
        }
        final int finalPage = page;
        final int pageSize = 10;

        plugin.runAsync(() -> {
            @SuppressWarnings("deprecation")
            OfflinePlayer target = Bukkit.getOfflinePlayer(targetName);
            UUID uuid = target.getUniqueId();
            if (uuid == null || (!target.hasPlayedBefore() && !target.isOnline())) {
                msg.key(sender, "player-not-found", "&c找不到目标玩家。");
                return;
            }
            var list = plugin.getTransactionLog().query(uuid, finalPage, pageSize);
            if (list.isEmpty()) {
                msg.raw(sender, "&7" + targetName + " 在第 " + finalPage + " 页没有交易记录。");
                return;
            }
            EconomyManager econ = plugin.getEconomyManager();
            java.text.SimpleDateFormat fmt = new java.text.SimpleDateFormat("MM-dd HH:mm");
            msg.raw(sender, "&b&l" + targetName + " 的交易流水 &7- 第 " + finalPage + " 页");
            for (var tx : list) {
                String feePart = tx.getFee() > 0 ? " &8(费 " + econ.format(tx.getFee()) + ")" : "";
                sender.sendMessage(com.craftbank.util.Text.color(
                        "&7[" + fmt.format(new java.util.Date(tx.getTimestamp())) + "] &f"
                                + typeLabel(tx.getType()) + " &a" + econ.format(tx.getAmount())
                                + feePart + " &8" + (tx.getDescription() == null ? "" : tx.getDescription())));
            }
        });
    }

    private String typeLabel(com.craftbank.model.Transaction.Type type) {
        return switch (type) {
            case PAY_OUT -> "转出";
            case PAY_IN -> "转入";
            case DEPOSIT -> "存活期";
            case WITHDRAW -> "取活期";
            case CHEQUE_ISSUE -> "开支票";
            case CHEQUE_REDEEM -> "兑支票";
            case TERM_CREATE -> "存定期";
            case TERM_CLAIM -> "领定期";
            case INTEREST -> "利息";
            case ADMIN_GIVE -> "管理给予";
            case ADMIN_TAKE -> "管理扣除";
            case ADMIN_SET -> "管理设置";
        };
    }

    private void sendHelp(CommandSender sender) {
        msg.raw(sender, "&b&l工艺银行管理 &7指令帮助:");
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin reload"));
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin give <玩家> <金额>"));
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin take <玩家> <金额>"));
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin set <玩家> <金额>"));
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin setinterest <类型> <利率>"));
        sender.sendMessage(com.craftbank.util.Text.color("&7/bankadmin log <玩家> [页码]"));
    }

    @Override
    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
        if (!sender.hasPermission("craftbank.admin")) {
            return List.of();
        }
        if (args.length == 1) {
            List<String> base = new ArrayList<>(List.of("reload", "give", "take", "set", "setinterest", "log"));
            base.removeIf(s -> !s.startsWith(args[0].toLowerCase()));
            return base;
        }
        if (args.length == 2 && args[0].equalsIgnoreCase("setinterest")) {
            return new ArrayList<>(List.of("savings", "term_7d", "term_15d", "term_30d"));
        }
        if (args.length == 2 && List.of("give", "take", "set", "log").contains(args[0].toLowerCase())) {
            return null; // 在线玩家名
        }
        return List.of();
    }
}