// BalanceAccountsTable — one-row-per-active-account table on /balance.
//
// Issue #141 (Bilan #3). Columns:
//   - Account name + category label
//   - Latest snapshot value (or "—" when no snapshot exists yet)
//   - Δ% over the active period (latest value vs the period-anchor value;
//     null when no anchor exists, rendered as "—").
//   - Actions menu (Detail no-op for now, Archive via service).
//
// Future return-metric columns (3M / 1A / since-creation / unadjusted)
// land in Issue #142. They have a TODO marker below.

import { useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import { Archive, MoreVertical } from "lucide-react";
import type {
  AccountLatestSnapshot,
  AccountPeriodAnchor,
} from "../../services/balance.service";

const cadFormatter = (locale: string) =>
  new Intl.NumberFormat(locale, {
    style: "currency",
    currency: "CAD",
    maximumFractionDigits: 2,
  });

interface BalanceAccountsTableProps {
  accounts: AccountLatestSnapshot[];
  periodAnchor: AccountPeriodAnchor[];
  onArchiveAccount?: (account: AccountLatestSnapshot) => void;
}

export default function BalanceAccountsTable({
  accounts,
  periodAnchor,
  onArchiveAccount,
}: BalanceAccountsTableProps) {
  const { t, i18n } = useTranslation();
  const fmt = cadFormatter(i18n.language === "fr" ? "fr-CA" : "en-CA");

  /** account_id → period anchor (start-of-period value). */
  const anchorMap = useMemo(() => {
    const m = new Map<number, AccountPeriodAnchor>();
    for (const a of periodAnchor) m.set(a.account_id, a);
    return m;
  }, [periodAnchor]);

  const [openMenuFor, setOpenMenuFor] = useState<number | null>(null);

  if (accounts.length === 0) {
    return (
      <div className="bg-[var(--card)] border border-[var(--border)] rounded-xl p-8 text-center text-[var(--muted-foreground)] italic">
        {t("balance.overview.noAccounts")}
      </div>
    );
  }

  return (
    <div className="bg-[var(--card)] border border-[var(--border)] rounded-xl overflow-hidden">
      <table className="w-full text-sm">
        <thead className="bg-[var(--muted)]/30">
          <tr>
            <th className="text-left px-4 py-3 font-medium">
              {t("balance.account.fields.name")}
            </th>
            <th className="text-left px-4 py-3 font-medium">
              {t("balance.account.fields.category")}
            </th>
            <th className="text-right px-4 py-3 font-medium">
              {t("balance.overview.latestValue")}
            </th>
            <th className="text-right px-4 py-3 font-medium">
              {t("balance.overview.periodDelta")}
            </th>
            {/* TODO Issue #142: 3M / 1A / depuis-création / non-ajusté columns */}
            <th className="text-right px-4 py-3 font-medium w-12">
              {t("balance.account.fields.actions")}
            </th>
          </tr>
        </thead>
        <tbody>
          {accounts.map((acc) => {
            const anchor = anchorMap.get(acc.account_id);
            const deltaPct =
              acc.latest_value !== null && anchor && anchor.anchor_value !== 0
                ? ((acc.latest_value - anchor.anchor_value) /
                    Math.abs(anchor.anchor_value)) *
                  100
                : null;
            return (
              <tr
                key={acc.account_id}
                className="border-t border-[var(--border)] hover:bg-[var(--muted)]/10"
              >
                <td className="px-4 py-3 font-medium">
                  {acc.account_name}
                  {acc.symbol ? (
                    <span className="ml-2 text-xs text-[var(--muted-foreground)]">
                      ({acc.symbol})
                    </span>
                  ) : null}
                </td>
                <td className="px-4 py-3 text-[var(--muted-foreground)]">
                  {t(acc.category_i18n_key, { defaultValue: acc.category_key })}
                </td>
                <td className="px-4 py-3 text-right tabular-nums">
                  {acc.latest_value !== null ? fmt.format(acc.latest_value) : "—"}
                </td>
                <td className="px-4 py-3 text-right tabular-nums">
                  {deltaPct !== null ? (
                    <span
                      className={
                        deltaPct >= 0
                          ? "text-[var(--positive)]"
                          : "text-[var(--negative)]"
                      }
                    >
                      {deltaPct >= 0 ? "+" : ""}
                      {deltaPct.toFixed(2)}%
                    </span>
                  ) : (
                    "—"
                  )}
                </td>
                <td className="px-4 py-3 text-right relative">
                  <button
                    type="button"
                    onClick={() =>
                      setOpenMenuFor(
                        openMenuFor === acc.account_id ? null : acc.account_id
                      )
                    }
                    className="p-1 rounded hover:bg-[var(--muted)]/40"
                    aria-label={t("balance.account.fields.actions")}
                  >
                    <MoreVertical size={16} />
                  </button>
                  {openMenuFor === acc.account_id && (
                    <div className="absolute right-2 top-full z-10 mt-1 bg-[var(--card)] border border-[var(--border)] rounded-lg shadow-md py-1 min-w-[160px] text-left">
                      <button
                        type="button"
                        disabled
                        className="block w-full px-3 py-2 text-sm text-[var(--muted-foreground)] cursor-not-allowed"
                        title={t("balance.overview.detailComingSoon")}
                      >
                        {t("balance.overview.detailAction")}
                      </button>
                      <button
                        type="button"
                        onClick={() => {
                          setOpenMenuFor(null);
                          onArchiveAccount?.(acc);
                        }}
                        className="flex items-center gap-2 w-full px-3 py-2 text-sm hover:bg-[var(--muted)]/40"
                      >
                        <Archive size={14} />
                        {t("balance.account.actions.archive")}
                      </button>
                    </div>
                  )}
                </td>
              </tr>
            );
          })}
        </tbody>
      </table>
    </div>
  );
}