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import React, { useState } from 'react';
import { ReferenceDataStatus } from '../api/types';
import { formatDate, formatNumber } from '../lib/format';
import { CodeCheckDialog } from './CodeCheckDialog';

/**
 * The chapters in scope (06–08, 22, 61–62, 84–85) hold about 5 800 TARIC
 * positions. Anything far below that is the demo seed, and a pack checked
 * against it comes back red for reasons that have nothing to do with the pack.
 */
const REAL_NOMENCLATURE_FLOOR = 1000;

export function Header({ status }: { status: ReferenceDataStatus | null }) {
  const [checkOpen, setCheckOpen] = useState(false);

  return (
    <header className="flex h-20 items-center justify-between gap-4 border-b border-line-header bg-white px-[6%] max-[560px]:h-16">
      <div className="text-2xl font-[750] tracking-[-1px]">
        Cargo<span className="text-brand-accent">Flow</span>
      </div>
      <div className="flex items-center gap-3">
        <button
          type="button"
          onClick={() => setCheckOpen(true)}
          className="rounded-[20px] border border-line-header px-[11px] py-[5px] text-xs text-slate-chipText hover:bg-slate-50"
        >
          Check code
        </button>
        <ReferenceChip status={status} />
      </div>
      <CodeCheckDialog open={checkOpen} onClose={() => setCheckOpen(false)} />
    </header>
  );
}

function ReferenceChip({ status }: { status: ReferenceDataStatus | null }) {
  if (status === null) {
    return (
      <span className="rounded-[20px] bg-slate-chip px-[11px] py-[5px] text-xs text-slate-chipText">
        Checking reference data…
      </span>
    );
  }

  const nomenclature = status.counts.nomenclature ?? 0;
  const measures = status.counts.measures ?? 0;
  const detail = Object.entries(status.counts)
    .map(([name, count]) => `${name}: ${formatNumber(count, 0)}`)
    .join(' · ');

  if (nomenclature === 0) {
    return (
      <Chip tone="red" title={detail}>
        No reference data loaded
      </Chip>
    );
  }

  if (nomenclature < REAL_NOMENCLATURE_FLOOR) {
    return (
      <Chip tone="amber" title={detail}>
        Demo data only — {formatNumber(nomenclature, 0)} codes, {formatNumber(measures, 0)}{' '}
        measures
      </Chip>
    );
  }

  return (
    <Chip tone="plain" title={detail}>
      TARIC as of {formatDate(status.referenceAsOf)} · {formatNumber(nomenclature, 0)} codes
    </Chip>
  );
}

function Chip({
  tone,
  title,
  children,
}: {
  tone: 'plain' | 'amber' | 'red';
  title: string;
  children: React.ReactNode;
}) {
  const classes = {
    plain: 'bg-slate-chip text-slate-chipText',
    amber: 'border border-confidence-amberLine bg-confidence-amberBg text-confidence-amber',
    red: 'border border-confidence-redLine bg-confidence-redBg text-confidence-red',
  }[tone];

  return (
    <span
      title={title}
      className={`shrink-0 rounded-[20px] px-[11px] py-[5px] text-xs ${classes}`}
    >
      {children}
    </span>
  );
}

export function Footer() {
  return (
    <footer className="my-6 text-center text-[11px] text-slate-foot">
      The declarant stays in control · Deterministic check against reference data, not
      customs advice.
    </footer>
  );
}

export function Card({ children }: { children: React.ReactNode }) {
  return <div className="cf-card">{children}</div>;
}