Search & Filtering

export const SEARCH_RELEVANCE_QUERY = /* GraphQL */ `
  query SearchRelevance($query: String!, $locale: [Locales], $fuzzy: Boolean) {
    SEO(
      locale: $locale
      where: { _fulltext: { match: $query, synonyms: [ONE], fuzzy: $fuzzy } }
      orderBy: { _ranking: RELEVANCE }
      limit: 10
      pinned: { phrase: $query }
      tracking: { phrase: $query, source: "/search" }
    ) {
      total
      items {
        _track
        _score
        _metadata {
          displayName
          url { default }
        }
      }
    }
  }
`;

export const SEARCH_FACETED_QUERY = /* GraphQL */ `
  query SearchFaceted($query: String!, $categories: [String!], $tags: [String!], $locale: [Locales], $fuzzy: Boolean) {
    ArticlePage(
      locale: $locale
      where: {
        _fulltext: { match: $query, fuzzy: $fuzzy }
        category: { in: $categories }
        tags: { in: $tags }
      }
      orderBy: { _ranking: RELEVANCE }
      limit: 10
      tracking: { phrase: $query, source: "/demo/listing" }
    ) {
      total
      items {
        _score
        category
        tags
        _metadata {
          displayName
          url { default }
        }
      }
      facets {
        category(orderType: COUNT, orderBy: DESC, limit: 10) { name count }
        tags(orderType: COUNT, orderBy: DESC, limit: 12) { name count }
      }
    }
  }
`;

export const AUTOCOMPLETE_QUERY = /* GraphQL */ `
  query Autocomplete($value: String!) {
    ArticlePage {
      autocomplete {
        tags(limit: 5, value: $value)
      }
    }
    SEO {
      autocomplete {
        _metadata {
          url { default(limit: 6, value: $value) }
        }
      }
    }
  }
`;

export const SEARCH_SEMANTIC_QUERY = /* GraphQL */ `
  query SearchSemantic($query: String!, $weight: Float!, $locale: [Locales], $fuzzy: Boolean) {
    SEO(
      locale: $locale
      where: { _fulltext: { match: $query, synonyms: [ONE], fuzzy: $fuzzy } }
      orderBy: { _ranking: SEMANTIC, _semanticWeight: $weight }
      limit: 10
      pinned: { phrase: $query }
      tracking: { phrase: $query, source: "/search" }
    ) {
      total
      items {
        _track
        _score
        _metadata {
          displayName
          url { default }
        }
      }
    }
  }
`;

import { type NextRequest, NextResponse } from "next/server";
import { graphqlFetch } from "@/lib/optimizely/client";
import {
  SEARCH_FACETED_QUERY,
  SEARCH_RELEVANCE_QUERY,
  SEARCH_SEMANTIC_QUERY,
} from "@/lib/graphql/queries/SearchContent";

const SINGLE_KEY = process.env.OPTIMIZELY_GRAPH_SINGLE_KEY ?? "";

// Pinned results carry a _score boosted by 2^32-1 (~4.29e9); organic scores stay
// in the hundreds/thousands. 1e9 is an unambiguous cutoff for flagging a pinned hit.
const PINNED_SCORE_THRESHOLD = 1_000_000_000;

function listParam(value: string | null): string[] | null {
  const parsed = value?.split(",").map((v) => v.trim()).filter(Boolean) ?? [];
  return parsed.length > 0 ? parsed : null; // null = Graph ignores the filter
}

export async function GET(request: NextRequest) {
  const { searchParams } = request.nextUrl;
  const q      = searchParams.get("q")?.trim() ?? "";
  const mode   = searchParams.get("mode") === "semantic" ? "semantic" : "relevance";
  const weight = Math.min(1, Math.max(0, parseFloat(searchParams.get("weight") ?? "0.5")));
  const locale = [searchParams.get("locale") ?? "en"];
  // Fuzzy (typo-tolerant) matching is on by default; only an explicit fuzzy=0 disables it.
  const fuzzy  = searchParams.get("fuzzy") !== "0";

  if (!q || q.length < 2) {
    return NextResponse.json({ total: 0, items: [] });
  }

  if (searchParams.get("facets") === "1") {
    return facetedSearch(q, listParam(searchParams.get("category")), listParam(searchParams.get("tags")), locale, fuzzy);
  }

  try {
    const result = await graphqlFetch<any>(
      mode === "semantic" ? SEARCH_SEMANTIC_QUERY : SEARCH_RELEVANCE_QUERY,
      mode === "semantic" ? { query: q, weight, locale, fuzzy } : { query: q, locale, fuzzy },
      { cache: "no-store" }
    );

    const raw = result.data?.SEO ?? { total: 0, items: [] };

    const items = (raw.items ?? [])
      .filter((item: any) => item?._metadata?.displayName && item?._metadata?.url?.default)
      .map((item: any) => {
        const score = (item._score as number | null | undefined) ?? 0;
        return {
          title:    item._metadata.displayName as string,
          url:      item._metadata.url.default as string,
          score,
          pinned:   score >= PINNED_SCORE_THRESHOLD,
          trackUrl: (() => {
            const t = item._track as string | null | undefined;
            return t && SINGLE_KEY ? `${t}&auth=${SINGLE_KEY}` : (t ?? null);
          })(),
        };
      });

    return NextResponse.json({ total: raw.total ?? items.length, items });
  } catch (error) {
    console.error("[Search] Query failed:", error);
    return NextResponse.json({ error: "Search failed" }, { status: 500 });
  }
}

async function facetedSearch(q: string, categories: string[] | null, tags: string[] | null, locale: string[] = ["en"], fuzzy = true) {
  try {
    const result = await graphqlFetch<any>(
      SEARCH_FACETED_QUERY,
      { query: q, categories, tags, locale, fuzzy },
      { cache: "no-store" }
    );

    const raw = result.data?.ArticlePage ?? { total: 0, items: [], facets: {} };

    const items = (raw.items ?? [])
      .filter((item: any) => item?._metadata?.displayName && item?._metadata?.url?.default)
      .map((item: any) => ({
        title:    item._metadata.displayName as string,
        url:      item._metadata.url.default as string,
        score:    (item._score as number | null | undefined) ?? 0,
        category: (item.category as string | null | undefined) ?? null,
        tags:     (item.tags as string[] | null | undefined) ?? [],
      }));

    return NextResponse.json({
      total: raw.total ?? items.length,
      items,
      facets: {
        category: raw.facets?.category ?? [],
        tags:     raw.facets?.tags ?? [],
      },
    });
  } catch (error) {
    console.error("[Search] Faceted query failed:", error);
    return NextResponse.json({ error: "Search failed" }, { status: 500 });
  }
}

"use client";
import { useState, useCallback, useRef } from "react";

type SearchResult = { title: string; url: string; score: number; pinned: boolean; trackUrl: string | null };

export default function SearchDemo() {
  const [query, setQuery] = useState("");
  const [mode, setMode] = useState<"relevance" | "semantic">("relevance");
  const [fuzzy, setFuzzy] = useState(true);
  const [results, setResults] = useState<SearchResult[]>([]);
  const [total, setTotal] = useState<number | null>(null);
  const [loading, setLoading] = useState(false);
  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);

  const search = useCallback((q: string, m: string, f: boolean) => {
    if (debounceRef.current) clearTimeout(debounceRef.current);
    if (!q || q.length < 2) {
      setResults([]);
      setTotal(null);
      return;
    }
    debounceRef.current = setTimeout(async () => {
      setLoading(true);
      try {
        const res = await fetch(`/api/search?q=${encodeURIComponent(q)}&mode=${m}${f ? "" : "&fuzzy=0"}`);
        const data = await res.json();
        setResults(data.items ?? []);
        setTotal(data.total ?? 0);
      } catch {
        setResults([]);
        setTotal(0);
      } finally {
        setLoading(false);
      }
    }, 300);
  }, []);

  return (
    <div className="bg-surface-lowest border border-ghost-border rounded-2xl p-6 space-y-4">
      <div className="flex gap-3">
        <input
          type="text"
          value={query}
          onChange={(e) => {
            setQuery(e.target.value);
            search(e.target.value, mode, fuzzy);
          }}
          placeholder="Type to search published content…"
          className="flex-1 px-4 py-2 text-sm bg-surface border border-ghost-border rounded-xl text-on-surface placeholder:text-on-surface-variant/50 focus:outline-none focus:ring-2 focus:ring-brand/30"
        />
        <select
          value={mode}
          onChange={(e) => {
            const m = e.target.value as "relevance" | "semantic";
            setMode(m);
            search(query, m, fuzzy);
          }}
          className="px-3 py-2 text-sm bg-surface border border-ghost-border rounded-xl text-on-surface focus:outline-none"
        >
          <option value="relevance">Relevance</option>
          <option value="semantic">Semantic</option>
        </select>
      </div>

      <label className="flex items-center gap-2 text-xs text-on-surface-variant cursor-pointer">
        <input
          type="checkbox"
          checked={fuzzy}
          onChange={(e) => {
            setFuzzy(e.target.checked);
            search(query, mode, e.target.checked);
          }}
          className="accent-brand"
        />
        Fuzzy matching (typo tolerance) - sends{" "}
        <code className="bg-surface px-1 rounded font-mono">fuzzy: true</code>
      </label>

      {loading && (
        <p className="text-xs text-on-surface-variant">Searching…</p>
      )}

      {!loading && total !== null && (
        <p className="text-xs text-on-surface-variant">
          {total} result{total !== 1 ? "s" : ""} for{" "}
          <strong className="text-on-surface">&ldquo;{query}&rdquo;</strong>
          {" "}· <span className="font-mono">{mode}</span> ranking
        </p>
      )}

      {results.length > 0 && (
        <ul className="space-y-2 divide-y divide-ghost-border">
          {results.map((r) => (
            <li
              key={r.url}
              className={`flex items-center justify-between gap-4 pt-2 first:pt-0 text-sm${
                r.pinned
                  ? " -mx-3 px-3 py-2 rounded-lg bg-brand/10 dark:bg-brand-fill/10 ring-1 ring-emerald-300/40"
                  : ""
              }`}
            >
              <div className="flex items-center gap-2 min-w-0">
                <a
                  href={r.url}
                  className="text-brand hover:underline truncate"
                  onClick={(e) => {
                    e.preventDefault();
                    if (r.trackUrl) fetch(r.trackUrl, { method: "GET", mode: "no-cors", keepalive: true }).catch(() => {});
                    window.location.href = r.url;
                  }}
                >{r.title}</a>
                {r.pinned && (
                  <span className="shrink-0 rounded-full bg-brand/10 dark:bg-brand-fill/20 text-brand dark:text-brand text-[10px] font-medium uppercase tracking-wide px-2 py-0.5">
                    Pinned
                  </span>
                )}
              </div>
              {!r.pinned && (
                <span className="text-xs font-mono text-on-surface-variant shrink-0">
                  {r.score.toFixed(3)}
                </span>
              )}
            </li>
          ))}
        </ul>
      )}

      {!loading && query.length >= 2 && results.length === 0 && total !== null && (
        <p className="text-xs text-on-surface-variant italic">No results found.</p>
      )}

      <p className="text-xs text-on-surface-variant border-t border-ghost-border pt-3">
        Calls <code className="bg-surface px-1 rounded font-mono">/api/search</code> with{" "}
        <code className="bg-surface px-1 rounded font-mono">cache: &ldquo;no-store&rdquo;</code>
        {" "}- kept out of the Next.js Data Cache; Graph&apos;s own response cache still applies.
      </p>
    </div>
  );
}

"use client";

import { useEffect, useRef, useState, useCallback } from "react";
import Link from "next/link";
import { DEFAULT_SITE_SETTINGS, type SiteSettingsStrings } from "@/lib/siteSettings";

interface SearchResult {
  title:    string;
  url:      string;
  score:    number;
  pinned:   boolean;
  trackUrl: string | null;
}

type SearchMode = "relevance" | "semantic";

interface Props {
  onClose: () => void;
  /** UI strings from the SiteSettings block; defaults keep the overlay working without CMS data. */
  labels?: SiteSettingsStrings;
}

export default function SearchOverlay({ onClose, labels = DEFAULT_SITE_SETTINGS }: Props) {
  const [query,   setQuery]   = useState("");
  const [mode,    setMode]    = useState<SearchMode>("relevance");
  const [weight,  setWeight]  = useState(0.5);
  const [fuzzy,   setFuzzy]   = useState(true);
  const [results, setResults] = useState<SearchResult[]>([]);
  const [total,   setTotal]   = useState(0);
  const [loading, setLoading] = useState(false);
  const inputRef  = useRef<HTMLInputElement>(null);
  const timerRef  = useRef<ReturnType<typeof setTimeout> | null>(null);

  useEffect(() => {
    inputRef.current?.focus();

    const handleKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") onClose();
    };
    document.addEventListener("keydown", handleKey);
    return () => document.removeEventListener("keydown", handleKey);
  }, [onClose]);

  const runSearch = useCallback(async (q: string, m: SearchMode, w: number, f: boolean) => {
    if (q.length < 2) { setResults([]); setTotal(0); return; }
    setLoading(true);
    try {
      const base = m === "semantic"
        ? `/api/search?q=${encodeURIComponent(q)}&mode=semantic&weight=${w}`
        : `/api/search?q=${encodeURIComponent(q)}&mode=relevance`;
      const res  = await fetch(f ? base : `${base}&fuzzy=0`);
      const data = await res.json();
      setResults(data.items ?? []);
      setTotal(data.total ?? 0);
    } finally {
      setLoading(false);
    }
  }, []);

  const handleQueryChange = (value: string) => {
    setQuery(value);
    if (timerRef.current) clearTimeout(timerRef.current);
    timerRef.current = setTimeout(() => runSearch(value, mode, weight, fuzzy), 300);
  };

  const handleModeChange = (m: SearchMode) => {
    setMode(m);
    if (query.length >= 2) runSearch(query, m, weight, fuzzy);
  };

  const handleWeightChange = (w: number) => {
    setWeight(w);
    if (query.length >= 2) runSearch(query, mode, w, fuzzy);
  };

  const handleFuzzyChange = (f: boolean) => {
    setFuzzy(f);
    if (query.length >= 2) runSearch(query, mode, weight, f);
  };

  return (
    <div
      data-component="SearchOverlay"
      className="fixed inset-0 z-[100] bg-black/50 flex items-start justify-center pt-24 px-4"
      onClick={(e) => { if (e.target === e.currentTarget) onClose(); }}
    >
      <div className="bg-surface-lowest rounded-2xl shadow-2xl w-full max-w-2xl border border-ghost-border overflow-hidden">
        {/* Input */}
        <div className="flex items-center gap-3 px-5 py-4 border-b border-ghost-border">
          <svg width="18" height="18" viewBox="0 0 18 18" fill="none" className="shrink-0 text-on-surface-variant">
            <circle cx="8" cy="8" r="5.5" stroke="currentColor" strokeWidth="1.5" />
            <path d="M12.5 12.5L16 16" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" />
          </svg>
          <input
            ref={inputRef}
            type="text"
            placeholder={labels.searchPlaceholder}
            value={query}
            onChange={(e) => handleQueryChange(e.target.value)}
            className="flex-1 bg-transparent text-sm text-on-surface placeholder:text-on-surface-variant outline-none"
          />
          <button
            onClick={onClose}
            className="text-xs text-on-surface-variant hover:text-on-surface transition-colors"
          >
            ESC
          </button>
        </div>

        {/* Mode toggle */}
        <div className="flex gap-1 px-5 py-3 border-b border-ghost-border">
          {(["relevance", "semantic"] as SearchMode[]).map((m) => (
            <button
              key={m}
              onClick={() => handleModeChange(m)}
              className={`px-3 py-1 rounded-lg text-xs font-medium capitalize transition-colors ${
                mode === m
                  ? "bg-brand-fill text-on-brand"
                  : "text-on-surface-variant hover:text-brand"
              }`}
            >
              {m}
            </button>
          ))}
          <button
            type="button"
            onClick={() => handleFuzzyChange(!fuzzy)}
            aria-pressed={fuzzy}
            title="Typo-tolerant matching (Damerau-Levenshtein edit distance)"
            className={`ml-auto px-3 py-1 rounded-lg text-xs font-medium transition-colors ${
              fuzzy
                ? "bg-brand-fill text-on-brand"
                : "text-on-surface-variant hover:text-brand"
            }`}
          >
            Fuzzy
          </button>
          <span className="text-xs text-on-surface-variant self-center">
            {mode === "semantic" ? "Vector similarity" : "Keyword (BM25)"}
          </span>
        </div>

        {/* Semantic weight slider */}
        {mode === "semantic" && (
          <div className="flex items-center gap-3 px-5 py-3 border-b border-ghost-border">
            <span className="text-xs text-on-surface-variant shrink-0">BM25</span>
            <input
              type="range"
              min={0}
              max={1}
              step={0.05}
              value={weight}
              onChange={(e) => handleWeightChange(parseFloat(e.target.value))}
              className="flex-1 accent-brand h-1.5 cursor-pointer"
            />
            <span className="text-xs text-on-surface-variant shrink-0">Semantic</span>
            <span className="text-xs font-mono text-brand w-8 text-right shrink-0">
              {weight.toFixed(2)}
            </span>
          </div>
        )}

        {/* Results */}
        <div className="max-h-96 overflow-y-auto">
          {loading && (
            <div className="px-5 py-8 text-sm text-center text-on-surface-variant">
              {labels.searchLoadingText}
            </div>
          )}

          {!loading && query.length >= 2 && results.length === 0 && (
            <div className="px-5 py-8 text-sm text-center text-on-surface-variant">
              {labels.searchNoResultsText.replace("{query}", query)}
            </div>
          )}

          {!loading && results.length > 0 && (
            <ul>
              {results.map((r, i) => (
                <li key={i}>
                  <Link
                    href={r.url}
                    onClick={() => {
                      onClose();
                      if (r.trackUrl) fetch(r.trackUrl, { method: "GET", mode: "no-cors", keepalive: true }).catch(() => {});
                    }}
                    className={`flex items-center justify-between gap-4 px-5 py-3 transition-colors group ${
                      r.pinned
                        ? "bg-brand/10 hover:bg-brand/20"
                        : "hover:bg-surface-low"
                    }`}
                  >
                    <div className="min-w-0">
                      <div className="flex items-center gap-2">
                        <span className="text-sm font-medium text-on-surface group-hover:text-brand transition-colors truncate">
                          {r.title}
                        </span>
                        {r.pinned && (
                          <span className="shrink-0 rounded-full bg-brand/15 text-brand text-[10px] font-medium uppercase tracking-wide px-2 py-0.5">
                            Pinned
                          </span>
                        )}
                      </div>
                      <div className="text-xs text-on-surface-variant mt-0.5 truncate max-w-md">
                        {r.url}
                      </div>
                    </div>
                    {!r.pinned && (
                      <span className="shrink-0 text-xs tabular-nums text-on-surface-variant opacity-60 text-right">
                        <span className="block">{r.score.toFixed(2)}</span>
                        <span className="block text-[10px] uppercase tracking-wide">
                          {mode === "semantic" ? "similarity" : "BM25"}
                        </span>
                      </span>
                    )}
                  </Link>
                </li>
              ))}
            </ul>
          )}

          {!loading && query.length < 2 && (
            <div className="px-5 py-8 text-sm text-center text-on-surface-variant">
              {labels.searchMinCharsText}
            </div>
          )}
        </div>

        {/* Footer */}
        {!loading && results.length > 0 && (
          <div className="px-5 py-2 border-t border-ghost-border text-xs text-on-surface-variant text-right">
            {total} result{total !== 1 ? "s" : ""}
          </div>
        )}
      </div>
    </div>
  );
}

import { graphqlFetch, CACHE_TTL } from "@/lib/optimizely/client";

export interface BankLocation {
  branchName: string;
  city: string;
  country: string;
  phone: string;
  services: string;
  lat: number | null;
  lon: number | null;
}

interface RawLocation {
  branchName?: string | null;
  city?:       string | null;
  country?:    string | null;
  phone?:      string | null;
  services?:   string | null;
  location?:   { lat?: number | null; lon?: number | null } | null;
}

interface GetLocationsResult {
  BankLocation?: {
    items?: Array<RawLocation | null> | null;
  } | null;
}

const LOCATION_FIELDS = /* GraphQL */ `
  branchName
  city
  country
  phone
  services
  location {
    lat
    lon
  }
`;

export const GET_LOCATIONS_QUERY = /* GraphQL */ `
  query GetBankLocations {
    BankLocation(limit: 20, orderBy: { city: ASC }) {
      items {
        ${LOCATION_FIELDS}
      }
    }
  }
`;

// Geo search: branches within $radius km of the origin, ranked nearest-first.
export const GET_NEARBY_LOCATIONS_QUERY = /* GraphQL */ `
  query GetNearbyBankLocations($lat: Float!, $lon: Float!, $radius: Int) {
    BankLocation(
      where: { location: { distance: { origin: { lat: $lat, lon: $lon }, radius: $radius, unit: KM } } }
      orderBy: { location: { origin: { lat: $lat, lon: $lon } } }
    ) {
      items {
        ${LOCATION_FIELDS}
      }
    }
  }
`;

function toLocation(raw: RawLocation): BankLocation {
  return {
    branchName: raw.branchName        ?? "",
    city:       raw.city              ?? "",
    country:    raw.country           ?? "",
    phone:      raw.phone             ?? "",
    services:   raw.services          ?? "",
    lat:        raw.location?.lat     ?? null,
    lon:        raw.location?.lon     ?? null,
  };
}

export async function getLocations(): Promise<{ items: BankLocation[]; fromGraph: boolean }> {
  try {
    const result = await graphqlFetch<GetLocationsResult>(
      GET_LOCATIONS_QUERY,
      {},
      { next: { revalidate: CACHE_TTL, tags: ["locations"] } }
    );

    const raw   = result.data?.BankLocation?.items ?? [];
    const items = raw
      .filter((l): l is RawLocation => l !== null)
      .map(toLocation)
      .filter((l) => l.branchName !== "");

    if (items.length === 0) return { items: [], fromGraph: false };
    return { items, fromGraph: true };
  } catch {
    return { items: [], fromGraph: false };
  }
}

export async function getNearbyLocations(
  lat: number,
  lon: number,
  radiusKm: number
): Promise<{ items: BankLocation[]; fromGraph: boolean }> {
  try {
    const result = await graphqlFetch<GetLocationsResult>(
      GET_NEARBY_LOCATIONS_QUERY,
      { lat, lon, radius: Math.round(radiusKm) },
      { next: { revalidate: CACHE_TTL, tags: ["locations"] } }
    );

    const raw   = result.data?.BankLocation?.items ?? [];
    const items = raw
      .filter((l): l is RawLocation => l !== null)
      .map(toLocation)
      .filter((l) => l.branchName !== "");

    return { items, fromGraph: items.length > 0 };
  } catch {
    return { items: [], fromGraph: false };
  }
}

import { type NextRequest, NextResponse } from "next/server";
import { getNearbyLocations, type BankLocation } from "@/lib/graphql/queries/GetLocations";
import { geocodeQuery } from "@/lib/geocode";
import { haversineKm } from "@/lib/geo";

const DEFAULT_RADIUS_KM = 500;
const MAX_RADIUS_KM = 5000;

export interface NearbyLocation extends BankLocation {
  distanceKm: number | null;
}

export async function GET(request: NextRequest) {
  const { searchParams } = request.nextUrl;
  const q = searchParams.get("q")?.trim() ?? "";
  const radius = Math.min(
    MAX_RADIUS_KM,
    Math.max(1, parseFloat(searchParams.get("radius") ?? String(DEFAULT_RADIUS_KM)) || DEFAULT_RADIUS_KM)
  );

  if (q.length < 2) {
    return NextResponse.json({ origin: null, items: [] });
  }

  try {
    const origin = await geocodeQuery(q);
    if (!origin) {
      return NextResponse.json({ origin: null, items: [], error: "Location not found" });
    }

    const { items } = await getNearbyLocations(origin.lat, origin.lon, radius);

    const withDistance: NearbyLocation[] = items.map((loc) => ({
      ...loc,
      distanceKm:
        loc.lat != null && loc.lon != null
          ? Math.round(haversineKm({ lat: origin.lat, lon: origin.lon }, { lat: loc.lat, lon: loc.lon }))
          : null,
    }));

    return NextResponse.json({
      origin: { lat: origin.lat, lon: origin.lon, label: origin.label },
      items: withDistance,
    });
  } catch (error) {
    console.error("[Locations/nearby] Query failed:", error);
    return NextResponse.json({ error: "Nearby search failed" }, { status: 500 });
  }
}

export interface GeocodeResult {
  lat: number;
  lon: number;
  label: string;
}

// Server-side geocoding via OpenStreetMap Nominatim (no API key required).
// Nominatim's usage policy requires a descriptive User-Agent and limits
// requests to ~1/sec - fine for this demo. Swap this out for a keyed
// geocoder (Google, Mapbox) if higher volume is ever needed.
const NOMINATIM_URL = "https://nominatim.openstreetmap.org/search";
const USER_AGENT = "mosey-bank-demo/1.0 (nearest-branch finder)";

export async function geocodeQuery(q: string): Promise<GeocodeResult | null> {
  const query = q.trim();
  if (!query) return null;

  const url = `${NOMINATIM_URL}?format=json&limit=1&q=${encodeURIComponent(query)}`;

  try {
    const res = await fetch(url, {
      headers: { "User-Agent": USER_AGENT, Accept: "application/json" },
      next: { revalidate: 86400 },
    });

    if (!res.ok) return null;

    const results = (await res.json()) as Array<{
      lat?: string;
      lon?: string;
      display_name?: string;
    }>;

    const hit = results[0];
    if (!hit?.lat || !hit?.lon) return null;

    const lat = parseFloat(hit.lat);
    const lon = parseFloat(hit.lon);
    if (Number.isNaN(lat) || Number.isNaN(lon)) return null;

    return { lat, lon, label: hit.display_name ?? query };
  } catch {
    return null;
  }
}

"use client";
import { useState, useCallback, type FormEvent } from "react";

interface NearbyLocation {
  branchName: string;
  city: string;
  country: string;
  phone: string;
  services: string;
  lat: number | null;
  lon: number | null;
  distanceKm: number | null;
}

interface NearbyResponse {
  origin: { lat: number; lon: number; label: string } | null;
  items: NearbyLocation[];
  error?: string;
}

const RADIUS_OPTIONS = [250, 500, 1000, 2500];

export default function BranchFinder() {
  const [query, setQuery] = useState("");
  const [radius, setRadius] = useState(500);
  const [data, setData] = useState<NearbyResponse | null>(null);
  const [loading, setLoading] = useState(false);
  const [message, setMessage] = useState<string | null>(null);

  const search = useCallback(
    async (e: FormEvent) => {
      e.preventDefault();
      const q = query.trim();
      if (q.length < 2) return;

      setLoading(true);
      setMessage(null);
      try {
        const res = await fetch(`/api/locations/nearby?q=${encodeURIComponent(q)}&radius=${radius}`);
        const json: NearbyResponse = await res.json();
        setData(json);

        if (json.error) setMessage(json.error);
        else if (!json.origin) setMessage("We couldn't find that location. Try a city name or full address.");
      } catch {
        setData(null);
        setMessage("Something went wrong. Please try again.");
      } finally {
        setLoading(false);
      }
    },
    [query, radius]
  );

  const results = data?.items ?? [];

  return (
    <div data-component="BranchFinder" className="space-y-6">
      <form
        onSubmit={search}
        className="flex flex-col sm:flex-row gap-3 bg-surface-lowest border border-ghost-border rounded-2xl p-5"
      >
        <input
          type="text"
          value={query}
          onChange={(e) => setQuery(e.target.value)}
          placeholder="City or address, e.g. Berlin"
          className="flex-1 px-4 py-2 text-sm bg-surface border border-ghost-border rounded-xl text-on-surface placeholder:text-on-surface-variant/50 focus:outline-none focus:ring-2 focus:ring-brand/30"
        />
        <select
          value={radius}
          onChange={(e) => setRadius(Number(e.target.value))}
          className="px-3 py-2 text-sm bg-surface border border-ghost-border rounded-xl text-on-surface focus:outline-none"
          aria-label="Search radius"
        >
          {RADIUS_OPTIONS.map((r) => (
            <option key={r} value={r}>
              Within {r} km
            </option>
          ))}
        </select>
        <button
          type="submit"
          disabled={loading || query.trim().length < 2}
          className="px-5 py-2 text-sm font-medium bg-brand text-on-brand rounded-xl disabled:opacity-50 focus:outline-none focus:ring-2 focus:ring-brand/30"
        >
          {loading ? "Searching…" : "Search"}
        </button>
      </form>

      {data?.origin && !message && (
        <p className="text-xs text-on-surface-variant">
          Nearest branches to <strong className="text-on-surface">{data.origin.label}</strong>
          {" "}({data.origin.lat.toFixed(4)}, {data.origin.lon.toFixed(4)})
        </p>
      )}

      {message && <p className="text-sm text-on-surface-variant">{message}</p>}

      {!loading && data && !message && results.length === 0 && (
        <p className="text-sm text-on-surface-variant">No branches within {radius} km. Try a larger radius.</p>
      )}

      {results.length > 0 && (
        <ul className="space-y-3">
          {results.map((loc) => (
            <li
              key={loc.branchName}
              className="flex items-start justify-between gap-4 bg-surface-lowest border border-ghost-border rounded-2xl p-5"
            >
              <div className="space-y-1">
                <p className="text-sm font-semibold text-on-surface">{loc.branchName}</p>
                <p className="text-xs text-on-surface-variant">{loc.city}, {loc.country}</p>
                <p className="text-xs text-on-surface-variant">{loc.services}</p>
                <p className="text-xs text-on-surface-variant">{loc.phone}</p>
              </div>
              {loc.distanceKm != null && (
                <span className="shrink-0 text-xs font-medium text-brand whitespace-nowrap">{loc.distanceKm} km away</span>
              )}
            </li>
          ))}
        </ul>
      )}

      {data && (
        <details className="group border border-ghost-border rounded-2xl overflow-hidden">
          <summary className="flex items-center justify-between px-5 py-3 cursor-pointer bg-surface-low hover:bg-surface-low/80 transition-colors list-none select-none">
            <span className="text-xs font-semibold text-on-surface">Underlying response - GET /api/locations/nearby</span>
            <span className="text-xs text-on-surface-variant">JSON</span>
          </summary>
          <pre className="bg-surface-lowest p-4 text-xs font-mono text-on-surface-variant overflow-auto leading-relaxed">
            <code>{JSON.stringify(data, null, 2)}</code>
          </pre>
        </details>
      )}
    </div>
  );
}