import { fmt } from "@/lib/format";
import { cn } from "@/lib/utils";
import type { RemitDetail } from "@/hooks/useRemitDetail";

type FinancialSummaryCardProps = {
  remit: RemitDetail;
};

/**
 * Single label/value row used inside the financial summary card.
 * `mono` opts the value into the project's mono numeric treatment
 * (font-mono + tabular-nums + slightly heavier weight) so currency
 * figures line up vertically across rows.
 */
function SummaryRow({
  testId,
  label,
  value,
  mono = false,
}: {
  testId: string;
  label: string;
  value: React.ReactNode;
  mono?: boolean;
}) {
  return (
    <div
      data-testid={testId}
      className="flex items-baseline justify-between gap-3 py-2"
    >
      <span className="eyebrow text-[color:var(--m-ink-tertiary)]">
        {label}
      </span>
      <span
        className={
          mono
            ? "mono text-sm tabular-nums text-[color:var(--m-ink-primary)]"
            : "text-sm text-[color:var(--m-ink-primary)]"
        }
      >
        {value}
      </span>
    </div>
  );
}

/**
 * Optional value renderer: returns `—` for null/undefined/empty so the
 * card never prints "null" or "undefined" in the UI.
 */
function opt(v: string | number | null | undefined, format?: (s: string) => string): React.ReactNode {
  if (v === null || v === undefined) return "—";
  if (typeof v === "string" && v.trim() === "") return "—";
  if (typeof v === "number" && !Number.isFinite(v)) return "—";
  return format ? format(String(v)) : v;
}

/**
 * Financial summary card for the remittance detail drawer.
 *
 * Surfaces the headline money figures (paid amount + adjustment amount)
 * plus the supporting payment identifiers (method, date, check/trace
 * number). Headline amounts are stacked at the top so the eye lands on
 * the totals first, then scans the supporting rows below.
 *
 * All fields gracefully degrade to "—" when absent — the detail
 * endpoint doesn't yet populate `paymentMethod`, `paymentDate`, or
 * `checkNumber` for every remit, and we'd rather show an em-dash than
 * "undefined".
 */
export function FinancialSummaryCard({ remit }: FinancialSummaryCardProps) {
  const hasAdjustment = Math.abs(remit.adjustmentAmount) > 0;

  return (
    <section
      className="flex flex-col gap-3 px-6 py-4"
      data-testid="financial-summary"
    >
      <h3
        data-testid="section-label"
        className="eyebrow text-[color:var(--m-ink-tertiary)]"
      >
        Financial Summary
      </h3>

      <div
        data-testid="financial-summary-inner"
        className="flex flex-col gap-4 rounded-lg border border-[color:var(--m-border-heavy)]/30 bg-[color:var(--m-surface)]/60 p-4"
      >
        {/* Headline totals — big display digits, side by side */}
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
          <div
            data-testid="summary-paid"
            className="flex flex-col gap-1.5 rounded-md border border-[color:var(--m-success)]/30 bg-[hsl(var(--success)/0.08)] px-3 py-2.5"
          >
            <span className="eyebrow text-[color:var(--m-success)]">
              Paid amount
            </span>
            <span
              className="display text-2xl tabular-nums text-[color:var(--m-success)]"
            >
              {fmt.usdPrecise(remit.paidAmount)}
            </span>
          </div>
          <div
            data-testid="summary-adjustment"
            className={cn(
              "flex flex-col gap-1.5 rounded-md border px-3 py-2.5",
              hasAdjustment
                ? "border-[color:var(--m-warning)]/40 bg-[hsl(var(--warning)/0.10)]"
                : "border-[color:var(--m-border-heavy)]/20 bg-[color:var(--m-surface)]/40"
            )}
          >
            <span
              className={cn(
                "eyebrow",
                hasAdjustment
                  ? "text-[color:var(--m-warning)]"
                  : "text-[color:var(--m-ink-tertiary)]"
              )}
            >
              Adjustment amount
            </span>
            <span
              className={cn(
                "display text-2xl tabular-nums",
                hasAdjustment
                  ? "text-[color:var(--m-warning)]"
                  : "text-[color:var(--m-ink-tertiary)]"
              )}
            >
              {hasAdjustment ? fmt.usdPrecise(remit.adjustmentAmount) : "—"}
            </span>
          </div>
        </div>

        {/* Supporting rows: method, payment date, check / trace number */}
        <div className="flex flex-col divide-y divide-[color:var(--m-border-heavy)]/15">
          <SummaryRow
            testId="summary-method"
            label="Payment method"
            value={opt(remit.paymentMethod)}
          />
          <SummaryRow
            testId="summary-payment-date"
            label="Payment date"
            value={opt(remit.paymentDate, fmt.date)}
          />
          <SummaryRow
            testId="summary-check-number"
            label="Check / trace number"
            value={opt(remit.checkNumber)}
            mono
          />
        </div>
      </div>
    </section>
  );
}