"use client";

import type { OpportunityParcel } from "@/types/nspd";

interface Props {
  opportunityParcels: OpportunityParcel[] | null | undefined;
}

type LayerKey = OpportunityParcel["layer"];

const LAYER_CONFIG: Record<
  LayerKey,
  { label: string; bg: string; badgeBg: string; color: string }
> = {
  auction_parcels: {
    label: "На аукционе",
    bg: "#fff7ed",
    badgeBg: "#fed7aa",
    color: "#c2410c",
  },
  scheme_parcels: {
    label: "Схема расположения",
    bg: "#eff6ff",
    badgeBg: "#bfdbfe",
    color: "#1d4ed8",
  },
  free_parcels: {
    label: "Свободный от прав",
    bg: "#f0fdf4",
    badgeBg: "#bbf7d0",
    color: "#15803d",
  },
  future_parcels: {
    label: "Планируемый (проект межевания)",
    bg: "#f9fafb",
    badgeBg: "#e5e7eb",
    color: "#374151",
  },
  oopt: {
    label: "ООПТ",
    bg: "#faf5ff",
    badgeBg: "#e9d5ff",
    color: "#7e22ce",
  },
};

function formatDistance(m: number | null): string {
  if (m === null) return "";
  if (m < 1000) return `${Math.round(m)} м`;
  return `${(m / 1000).toFixed(1)} км`;
}

function buildNspdViewerUrl(cadNum: string): string {
  return `https://nspd.gov.ru/map?cadastralNumber=${encodeURIComponent(cadNum)}`;
}

export function NspdOpportunityBlock({ opportunityParcels }: Props) {
  const parcels = opportunityParcels ?? [];

  if (parcels.length === 0) {
    return null;
  }

  // Group by layer type
  const grouped = parcels.reduce<Record<LayerKey, OpportunityParcel[]>>(
    (acc, p) => {
      const key = p.layer as LayerKey;
      if (!acc[key]) acc[key] = [];
      acc[key].push(p);
      return acc;
    },
    {} as Record<LayerKey, OpportunityParcel[]>,
  );

  // Stable display order: auction first (highest priority)
  const layerOrder: LayerKey[] = [
    "auction_parcels",
    "free_parcels",
    "scheme_parcels",
    "future_parcels",
    "oopt",
  ];

  return (
    <div style={{ display: "flex", flexDirection: "column", gap: 10 }}>
      {layerOrder.map((layerKey) => {
        const items = grouped[layerKey];
        if (!items || items.length === 0) return null;
        const cfg = LAYER_CONFIG[layerKey];

        return (
          <div
            key={layerKey}
            style={{
              background: cfg.bg,
              border: `1px solid ${cfg.badgeBg}`,
              borderRadius: 8,
              padding: "10px 14px",
            }}
          >
            <div
              style={{
                display: "flex",
                alignItems: "center",
                gap: 8,
                marginBottom: items.length > 1 ? 8 : 0,
              }}
            >
              <span
                style={{
                  background: cfg.badgeBg,
                  color: cfg.color,
                  borderRadius: 5,
                  padding: "2px 10px",
                  fontSize: 12,
                  fontWeight: 600,
                  whiteSpace: "nowrap",
                }}
              >
                {cfg.label}
              </span>
              <span style={{ fontSize: 13, color: "#4b5563" }}>
                {items.length} уч.
              </span>
            </div>

            {items.map((p, idx) => (
              <div
                key={idx}
                style={{
                  display: "flex",
                  alignItems: "center",
                  gap: 8,
                  marginTop: 6,
                  fontSize: 13,
                }}
              >
                {p.cad_num ? (
                  <a
                    href={buildNspdViewerUrl(p.cad_num)}
                    target="_blank"
                    rel="noopener noreferrer"
                    style={{ color: cfg.color, textDecoration: "underline" }}
                  >
                    {p.cad_num}
                  </a>
                ) : (
                  <span style={{ color: "#6b7280" }}>—</span>
                )}
                {p.distance_m !== null && (
                  <span style={{ color: "#6b7280" }}>
                    {formatDistance(p.distance_m)}
                  </span>
                )}
              </div>
            ))}
          </div>
        );
      })}
    </div>
  );
}