'use client';

import { useEffect, useMemo, useRef, useState } from 'react';
import { Check, ChevronDown, Loader2, Search } from 'lucide-react';

export type FormSelectOption = {
  value: string;
  label: string;
  hint?: string;
  imageUrl?: string;
};

type FormSelectProps = {
  label: string;
  placeholder: string;
  value: string;
  options: FormSelectOption[];
  disabled?: boolean;
  loading?: boolean;
  searchable?: boolean;
  onChange: (value: string) => void;
};

export function FormSelect({
  label,
  placeholder,
  value,
  options,
  disabled = false,
  loading = false,
  searchable = false,
  onChange,
}: FormSelectProps) {
  const [open, setOpen] = useState(false);
  const [query, setQuery] = useState('');
  const rootRef = useRef<HTMLDivElement>(null);
  const searchRef = useRef<HTMLInputElement>(null);

  const selected = options.find((option) => option.value === value);
  const isDisabled = disabled || loading;

  const filtered = useMemo(() => {
    const q = query.trim().toLowerCase();
    if (!q) return options;
    return options.filter((option) =>
      `${option.label} ${option.hint || ''}`.toLowerCase().includes(q)
    );
  }, [options, query]);

  useEffect(() => {
    const onDocClick = (event: MouseEvent) => {
      if (!rootRef.current?.contains(event.target as Node)) {
        setOpen(false);
      }
    };
    const onKey = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setOpen(false);
    };
    document.addEventListener('mousedown', onDocClick);
    document.addEventListener('keydown', onKey);
    return () => {
      document.removeEventListener('mousedown', onDocClick);
      document.removeEventListener('keydown', onKey);
    };
  }, []);

  useEffect(() => {
    if (!open) {
      setQuery('');
      return;
    }
    const id = window.setTimeout(() => searchRef.current?.focus(), 0);
    return () => window.clearTimeout(id);
  }, [open]);

  const showSearch = searchable && options.length > 6;

  return (
    <div ref={rootRef} className="relative">
      <span className="block font-semibold text-[#1a1a1a] text-[11px] mb-1.5">
        {label}
      </span>
      <button
        type="button"
        disabled={isDisabled}
        aria-haspopup="listbox"
        aria-expanded={open}
        onClick={() => {
          if (!isDisabled) setOpen((prev) => !prev);
        }}
        className={`w-full min-h-[46px] px-3.5 rounded-lg border text-left flex items-center gap-2.5 transition ${
          open
            ? 'border-primary bg-white ring-2 ring-primary/15'
            : selected
              ? 'border-gray-200 bg-white hover:border-primary/40'
              : 'border-gray-200 bg-gray-50 hover:border-gray-300'
        } ${
          isDisabled
            ? 'opacity-60 cursor-not-allowed bg-gray-100'
            : 'cursor-pointer'
        }`}
      >
        {loading ? (
          <Loader2 className="w-4 h-4 animate-spin text-primary shrink-0" />
        ) : selected?.imageUrl ? (
          // eslint-disable-next-line @next/next/no-img-element
          <img
            src={selected.imageUrl}
            alt=""
            className="w-6 h-6 object-contain shrink-0"
          />
        ) : null}
        <span
          className={`flex-1 text-[13px] truncate ${
            selected ? 'font-semibold text-[#1a1a1a]' : 'text-gray-400'
          }`}
        >
          {loading ? 'Loading...' : selected?.label || placeholder}
        </span>
        <ChevronDown
          className={`w-4 h-4 shrink-0 transition-transform ${
            open ? 'rotate-180 text-primary' : 'text-gray-400'
          }`}
        />
      </button>

      {open && (
        <div className="absolute z-30 mt-1.5 w-full bg-white border border-gray-200 rounded-xl shadow-[0_12px_32px_rgba(15,23,42,0.12)] overflow-hidden">
          {showSearch && (
            <div className="p-2 border-b border-gray-100">
              <div className="relative">
                <Search className="w-3.5 h-3.5 text-gray-400 absolute left-3 top-1/2 -translate-y-1/2" />
                <input
                  ref={searchRef}
                  type="text"
                  value={query}
                  onChange={(event) => setQuery(event.target.value)}
                  placeholder={`Search ${label.toLowerCase()}...`}
                  className="w-full h-9 pl-8 pr-3 rounded-lg bg-gray-50 border border-gray-200 text-[12px] text-[#1a1a1a] outline-none focus:border-primary focus:ring-2 focus:ring-primary/15"
                />
              </div>
            </div>
          )}
          <ul role="listbox" className="max-h-56 overflow-y-auto py-1">
            {filtered.length === 0 ? (
              <li className="px-3.5 py-6 text-center text-[12px] text-gray-400">
                No matches found
              </li>
            ) : (
              filtered.map((option) => {
                const isSelected = option.value === value;
                return (
                  <li key={option.value}>
                    <button
                      type="button"
                      role="option"
                      aria-selected={isSelected}
                      onClick={() => {
                        onChange(option.value);
                        setOpen(false);
                      }}
                      className={`w-full px-3.5 py-2.5 flex items-center gap-2.5 text-left transition ${
                        isSelected
                          ? 'bg-primary/5 text-primary'
                          : 'text-[#1a1a1a] hover:bg-gray-50'
                      }`}
                    >
                      {option.imageUrl ? (
                        // eslint-disable-next-line @next/next/no-img-element
                        <img
                          src={option.imageUrl}
                          alt=""
                          className="w-6 h-6 object-contain shrink-0"
                        />
                      ) : null}
                      <span className="flex-1 min-w-0">
                        <span className="block text-[13px] font-semibold truncate">
                          {option.label}
                        </span>
                        {option.hint ? (
                          <span className="block text-[11px] text-gray-400 truncate">
                            {option.hint}
                          </span>
                        ) : null}
                      </span>
                      {isSelected ? (
                        <Check className="w-4 h-4 text-primary shrink-0" />
                      ) : null}
                    </button>
                  </li>
                );
              })
            )}
          </ul>
        </div>
      )}
    </div>
  );
}