"use client";

import { formatCurrencyFull } from "@/lib/analytics-utils";
import { MENU_CATEGORIES } from "@/lib/constants";
import type { ProductSalesStats } from "@/lib/types";
import { useMemo, useState } from "react";

interface ProductTableProps {
  data: ProductSalesStats[];
}

const categoryName = (id: string) =>
  MENU_CATEGORIES.find((c) => c.id === id)?.name ?? id;

/**
 * Sortable product sales table.
 * Click column headers to sort ascending/descending.
 */
export function ProductTable({ data }: ProductTableProps) {
  const [sortKey, setSortKey] = useState<keyof ProductSalesStats>("revenue");
  const [sortDir, setSortDir] = useState<"asc" | "desc">("desc");

  const sorted = useMemo(
    () =>
      [...data].sort((a, b) => {
        const av = a[sortKey] as number;
        const bv = b[sortKey] as number;
        return sortDir === "desc" ? bv - av : av - bv;
      }),
    [data, sortKey, sortDir],
  );

  const handleSort = (key: keyof ProductSalesStats) => {
    if (key === sortKey) setSortDir((d) => (d === "desc" ? "asc" : "desc"));
    else {
      setSortKey(key);
      setSortDir("desc");
    }
  };

  const sortIcon = (col: keyof ProductSalesStats) => (
    <i
      className={`fa-solid ml-1 text-xs ${
        sortKey === col
          ? sortDir === "desc"
            ? "fa-sort-down text-(--color-primary)"
            : "fa-sort-up text-(--color-primary)"
          : "fa-sort text-(--color-text-muted)"
      }`}
    />
  );

  const SortTh = ({
    col,
    label,
    className = "",
  }: {
    col: keyof ProductSalesStats;
    label: string;
    className?: string;
  }) => (
    <th
      className={`cursor-pointer px-4 py-3 font-semibold text-(--color-text-secondary) hover:text-(--color-primary) ${className}`}
      onClick={() => handleSort(col)}
    >
      {label} {sortIcon(col)}
    </th>
  );

  return (
    <div className="overflow-x-auto rounded-xl border border-(--color-border-light)">
      <table className="w-full min-w-175 text-sm">
        <thead>
          <tr className="bg-background border-b border-(--color-border-light)">
            <th className="px-4 py-3 text-left font-semibold text-(--color-text-secondary)">
              #
            </th>
            <th className="px-4 py-3 text-left font-semibold text-(--color-text-secondary)">
              Sản phẩm
            </th>
            <th className="px-4 py-3 text-left font-semibold text-(--color-text-secondary)">
              Danh mục
            </th>
            <SortTh col="unitsSold" label="Số lượng" className="text-right" />
            <SortTh col="revenue" label="Doanh thu" className="text-right" />
            <th className="px-4 py-3 text-right font-semibold text-(--color-text-secondary)">
              Giá nhập
            </th>
            <th className="px-4 py-3 text-right font-semibold text-(--color-text-secondary)">
              Giá bán
            </th>
            <SortTh col="profit" label="Lợi nhuận" className="text-right" />
            <SortTh col="profitMargin" label="Biên LN" className="text-right" />
          </tr>
        </thead>
        <tbody>
          {sorted.map((row, i) => (
            <tr
              key={row.productId}
              className="border-b border-(--color-border-light) bg-(--color-bg-card) transition-colors hover:bg-(--color-accent-light)/30"
            >
              <td className="px-4 py-3 text-(--color-text-muted)">{i + 1}</td>
              <td className="text-foreground px-4 py-3 font-medium">
                {row.name}
              </td>
              <td className="px-4 py-3">
                <span className="rounded-full bg-(--color-accent-light) px-2 py-0.5 text-xs text-(--color-primary)">
                  {categoryName(row.category)}
                </span>
              </td>
              <td className="text-foreground px-4 py-3 text-right tabular-nums">
                {row.unitsSold.toLocaleString()}
              </td>
              <td className="px-4 py-3 text-right font-medium text-(--color-primary) tabular-nums">
                {formatCurrencyFull(row.revenue)}
              </td>
              <td className="px-4 py-3 text-right text-(--color-text-muted) tabular-nums">
                {formatCurrencyFull(row.costPrice)}
              </td>
              <td className="px-4 py-3 text-right text-(--color-text-secondary) tabular-nums">
                {formatCurrencyFull(row.sellingPrice)}
              </td>
              <td className="px-4 py-3 text-right font-medium text-green-600 tabular-nums">
                {formatCurrencyFull(row.profit)}
              </td>
              <td className="px-4 py-3 text-right">
                <span
                  className={`inline-block rounded-full px-2 py-0.5 text-xs font-semibold ${
                    row.profitMargin >= 70
                      ? "bg-green-100 text-green-700"
                      : row.profitMargin >= 60
                        ? "bg-yellow-100 text-yellow-700"
                        : "bg-red-100 text-red-600"
                  }`}
                >
                  {row.profitMargin.toFixed(1)}%
                </span>
              </td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}