import Link from "next/link";
import type { ExpertBeoordeling } from "../../../lib/db";
import { BONUS_MALUS_OPTIONS, EXPERT_CRITERIA } from "../../../lib/rikxCalculatie";

export type BeoordelingMetNaam = ExpertBeoordeling & { expert_name: string };

const getal = new Intl.NumberFormat("nl-NL", { maximumFractionDigits: 2 });
const fmt = (v: number | null) => (v === null ? "—" : getal.format(v));

function gemiddelde(b: BeoordelingMetNaam): number | null {
  const scores = [b.duur_impact, b.levensdomeinen, b.basissituatie].filter((v): v is number => v !== null);
  return scores.length ? scores.reduce((a, c) => a + c, 0) / scores.length : null;
}

function bonusMalusLabel(id: string | null): string {
  if (!id) return "Geen";
  return BONUS_MALUS_OPTIONS.find((o) => o.id === id)?.label ?? id;
}

// Alleen-lezen overzicht van de beoordelingen die experts via hun eigen pagina hebben ingevuld.
// Impactscore M in de Rikx calculatie is het gemiddelde van de kolom "Gemiddelde".
export function ExpertBeoordelingen({ beoordelingen }: { beoordelingen: BeoordelingMetNaam[] }) {
  if (beoordelingen.length === 0) {
    return (
      <p className="text-sm text-zinc-500 rounded-lg bg-zinc-50 dark:bg-zinc-800/50 px-4 py-3">
        Nog geen beoordelingen. Experts vullen hun scores in op hun eigen pagina; beheer de experts bij{" "}
        <Link href="/experts" className="underline hover:text-rikx-orange-dark">
          CRM → Experts
        </Link>
        .
      </p>
    );
  }

  const cell = "py-2 px-3 text-right tabular-nums";
  return (
    <div className="flex flex-col gap-4">
      <div className="overflow-x-auto">
        <table className="w-full text-sm">
          <thead>
            <tr className="text-zinc-500 border-b border-zinc-200 dark:border-zinc-800">
              <th className="text-left font-medium py-2 pr-3">Criterium</th>
              {beoordelingen.map((b) => (
                <th key={b.expert_id} className="text-right font-medium py-2 px-3 whitespace-nowrap">
                  {b.expert_name}
                </th>
              ))}
            </tr>
          </thead>
          <tbody className="divide-y divide-zinc-100 dark:divide-zinc-800">
            {EXPERT_CRITERIA.map((c) => (
              <tr key={c.id}>
                <td className="py-2 pr-3 text-zinc-700 dark:text-zinc-300 whitespace-nowrap">
                  {c.label}
                  <span className="block text-xs text-zinc-500">{c.schaal}</span>
                </td>
                {beoordelingen.map((b) => (
                  <td key={b.expert_id} className={cell}>
                    {fmt(b[c.id])}
                  </td>
                ))}
              </tr>
            ))}
            <tr className="font-semibold text-zinc-900 dark:text-zinc-100">
              <td className="py-2 pr-3">Gemiddelde</td>
              {beoordelingen.map((b) => (
                <td key={b.expert_id} className={cell}>
                  {fmt(gemiddelde(b))}
                </td>
              ))}
            </tr>
            <tr>
              <td className="py-2 pr-3 text-zinc-700 dark:text-zinc-300">Advies Bonus / Malus</td>
              {beoordelingen.map((b) => (
                <td key={b.expert_id} className={cell}>
                  {bonusMalusLabel(b.bonus_malus_advies)}
                </td>
              ))}
            </tr>
          </tbody>
        </table>
      </div>
      {beoordelingen.some((b) => b.toelichting) && (
        <div className="flex flex-col gap-2">
          <h4 className="text-sm font-semibold text-zinc-900 dark:text-zinc-100">Toelichting van de experts</h4>
          {beoordelingen
            .filter((b) => b.toelichting)
            .map((b) => (
              <blockquote
                key={b.expert_id}
                className="rounded-lg border-l-2 border-rikx-orange bg-zinc-50 dark:bg-zinc-800/50 px-4 py-2 text-sm text-zinc-700 dark:text-zinc-300 whitespace-pre-line"
              >
                <span className="block text-xs font-medium text-zinc-500 mb-1">{b.expert_name}</span>
                {b.toelichting}
              </blockquote>
            ))}
        </div>
      )}
    </div>
  );
}