"use client";

import { useState, useRef, useEffect, useCallback } from "react";
import { Search, MapPin, LandPlot, Building2, X, Loader2 } from "lucide-react";
import { Input } from "@/shared/components/ui/input";
import { Button } from "@/shared/components/ui/button";
import { cn } from "@/shared/lib/utils";
import type { SearchResult } from "../types";

type SearchBarProps = {
  onResultSelect: (result: SearchResult) => void;
  className?: string;
};

export function SearchBar({ onResultSelect, className }: SearchBarProps) {
  const [query, setQuery] = useState("");
  const [results, setResults] = useState<SearchResult[]>([]);
  const [loading, setLoading] = useState(false);
  const [open, setOpen] = useState(false);
  const [selectedIdx, setSelectedIdx] = useState(-1);
  const containerRef = useRef<HTMLDivElement>(null);
  const debounceRef = useRef<ReturnType<typeof setTimeout>>(undefined);

  // Debounced search
  const doSearch = useCallback((q: string) => {
    if (debounceRef.current) clearTimeout(debounceRef.current);
    if (q.length < 2) {
      setResults([]);
      setOpen(false);
      return;
    }
    debounceRef.current = setTimeout(() => {
      setLoading(true);
      fetch(`/api/geoportal/search?q=${encodeURIComponent(q)}&limit=15`)
        .then((r) => (r.ok ? r.json() : Promise.reject(r.status)))
        .then((data: { results: SearchResult[] }) => {
          setResults(data.results);
          setOpen(data.results.length > 0);
          setSelectedIdx(-1);
        })
        .catch(() => {
          setResults([]);
          setOpen(false);
        })
        .finally(() => setLoading(false));
    }, 300);
  }, []);

  // Click outside to close
  useEffect(() => {
    const handler = (e: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
        setOpen(false);
      }
    };
    document.addEventListener("mousedown", handler);
    return () => document.removeEventListener("mousedown", handler);
  }, []);

  const handleSelect = (result: SearchResult) => {
    setOpen(false);
    setQuery(result.label);
    onResultSelect(result);
  };

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (!open || results.length === 0) return;
    if (e.key === "ArrowDown") {
      e.preventDefault();
      setSelectedIdx((i) => Math.min(i + 1, results.length - 1));
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      setSelectedIdx((i) => Math.max(i - 1, 0));
    } else if (e.key === "Enter" && selectedIdx >= 0) {
      e.preventDefault();
      const sel = results[selectedIdx];
      if (sel) handleSelect(sel);
    } else if (e.key === "Escape") {
      setOpen(false);
    }
  };

  const typeIcon = (type: SearchResult["type"]) => {
    switch (type) {
      case "uat":
        return <MapPin className="h-3.5 w-3.5 text-violet-500" />;
      case "parcel":
        return <LandPlot className="h-3.5 w-3.5 text-green-500" />;
      case "building":
        return <Building2 className="h-3.5 w-3.5 text-blue-500" />;
    }
  };

  return (
    <div ref={containerRef} className={cn("relative", className)}>
      <div className="relative">
        <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 h-3.5 w-3.5 text-muted-foreground" />
        <Input
          placeholder="Cauta parcela, UAT, proprietar..."
          value={query}
          onChange={(e) => {
            setQuery(e.target.value);
            doSearch(e.target.value);
          }}
          onFocus={() => {
            if (results.length > 0) setOpen(true);
          }}
          onKeyDown={handleKeyDown}
          className="pl-8 pr-8 h-8 text-sm bg-background backdrop-blur-sm text-foreground"
        />
        {loading && (
          <Loader2 className="absolute right-8 top-1/2 -translate-y-1/2 h-3.5 w-3.5 animate-spin text-muted-foreground" />
        )}
        {query && (
          <Button
            variant="ghost"
            size="sm"
            className="absolute right-0.5 top-1/2 -translate-y-1/2 h-6 w-6 p-0"
            onClick={() => {
              setQuery("");
              setResults([]);
              setOpen(false);
            }}
          >
            <X className="h-3 w-3" />
          </Button>
        )}
      </div>

      {/* Results dropdown */}
      {open && results.length > 0 && (
        <div className="absolute top-full mt-1 w-full bg-background border rounded-lg shadow-lg overflow-hidden z-50 max-h-80 overflow-y-auto">
          {results.map((r, i) => (
            <button
              key={r.id}
              className={cn(
                "w-full flex items-start gap-2.5 px-3 py-2 text-left hover:bg-muted/50 transition-colors",
                i === selectedIdx && "bg-muted"
              )}
              onClick={() => handleSelect(r)}
              onMouseEnter={() => setSelectedIdx(i)}
            >
              <div className="mt-0.5 shrink-0">{typeIcon(r.type)}</div>
              <div className="min-w-0 flex-1">
                <p className="text-sm font-medium truncate">{r.label}</p>
                {r.sublabel && (
                  <p className="text-xs text-muted-foreground truncate">{r.sublabel}</p>
                )}
              </div>
            </button>
          ))}
        </div>
      )}
    </div>
  );
}
