"use client";

import { useRouter, usePathname } from "next/navigation";
import { CopyButton } from "@/components/copy-button";

function formatMonthLabel(monthKey: string): string {
  const [y, m] = monthKey.split("-").map(Number);
  const labels = ["янв", "фев", "мар", "апр", "май", "июн", "июл", "авг", "сен", "окт", "ноя", "дек"];
  return `${labels[m - 1]} ${y}`;
}

interface MonthlyMoneyStats {
  totalCost: number;
  totalPrepayment: number;
  totalDiscount: number;
  totalOutstanding: number;
}

function fmtMoney(n: number): string {
  return n.toLocaleString("ru-RU");
}

export function StatisticsView({
  monthKey,
  stats,
  money,
}: {
  monthKey: string;
  stats: { name: string; count: number }[];
  money: MonthlyMoneyStats;
}) {
  const router = useRouter();
  const pathname = usePathname();
  const total = stats.reduce((s, r) => s + r.count, 0);
  const max = Math.max(1, ...stats.map((r) => r.count));

  const summaryText = [
    `Статистика по бронированиям на ${formatMonthLabel(monthKey)}:`,
    "",
    ...stats.map((r) => `${r.name}: ${r.count}`),
    "",
    `Сумма бронирований: ${fmtMoney(money.totalCost)} ₽`,
    `Собрано предоплат: ${fmtMoney(money.totalPrepayment)} ₽`,
    `Остаток к оплате: ${fmtMoney(money.totalOutstanding)} ₽`,
    money.totalDiscount > 0 ? `Скидок дано: ${fmtMoney(money.totalDiscount)} ₽` : null,
  ]
    .filter((l) => l !== null)
    .join("\n");

  return (
    <div className="flex flex-col gap-4">
      <div className="card flex flex-wrap items-center justify-between gap-3 p-3">
        <input
          type="month"
          value={monthKey}
          onChange={(e) => router.push(`${pathname}?month=${e.target.value}`)}
          className="rounded-md border border-border bg-surface px-3 py-1.5 text-sm outline-none focus:border-accent"
        />
        <span className="text-sm text-text-muted">Всего бронирований: {total}</span>
        {stats.length > 0 && <CopyButton text={summaryText} label="Скопировать статистику" size="lg" />}
      </div>

      <div className="grid grid-cols-2 gap-3 sm:grid-cols-4">
        <div className="card p-3">
          <p className="mb-1 text-xs font-medium text-text-muted">Сумма бронирований</p>
          <p className="font-mono text-base font-semibold">{fmtMoney(money.totalCost)} ₽</p>
        </div>
        <div className="card p-3">
          <p className="mb-1 text-xs font-medium text-text-muted">Собрано предоплат</p>
          <p className="font-mono text-base font-semibold text-success">{fmtMoney(money.totalPrepayment)} ₽</p>
        </div>
        <div className="card p-3">
          <p className="mb-1 text-xs font-medium text-text-muted">Остаток к оплате</p>
          <p className="font-mono text-base font-semibold text-danger">{fmtMoney(money.totalOutstanding)} ₽</p>
        </div>
        <div className="card p-3">
          <p className="mb-1 text-xs font-medium text-text-muted">Скидок дано</p>
          <p className="font-mono text-base font-semibold">{fmtMoney(money.totalDiscount)} ₽</p>
        </div>
      </div>

      <div className="card p-4">
        {stats.length === 0 ? (
          <p className="text-sm text-text-muted">За этот месяц бронирований нет.</p>
        ) : (
          <div className="flex flex-col gap-3">
            {stats.map((r) => (
              <div key={r.name} className="flex items-center gap-3">
                <span className="w-40 shrink-0 truncate text-sm">{r.name}</span>
                <div className="h-2.5 flex-1 overflow-hidden rounded-full bg-surface-hover">
                  <div className="h-full rounded-full bg-accent" style={{ width: `${(r.count / max) * 100}%` }} />
                </div>
                <span className="w-8 shrink-0 text-right text-sm font-medium">{r.count}</span>
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  );
}