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"use client";

/**
 * Mode Natural Input Component
 * Natural language input for study queries with local mode detection
 */

import { useState } from "react";
import { detectModeFromQuery, EXAMPLE_QUERIES, type Mode } from "./modeSelectionTypes";

interface ModeNaturalInputProps {
  onSubmit: (query: string, detectedMode: Mode) => void;
}

export function ModeNaturalInput({ onSubmit }: ModeNaturalInputProps) {
  const [query, setQuery] = useState("");
  const [isFocused, setIsFocused] = useState(false);

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (query.trim()) {
      const detectedMode = detectModeFromQuery(query);
      if (detectedMode) {
        onSubmit(query.trim(), detectedMode);
      }
    }
  };

  const handleExampleClick = (example: string) => {
    setQuery(example);
    const detectedMode = detectModeFromQuery(example);
    if (detectedMode) {
      onSubmit(example, detectedMode);
    }
  };

  return (
    <div className="w-full max-w-2xl mx-auto">
      <form onSubmit={handleSubmit} className="mb-6">
        <div className={`relative transition-all duration-200 ${isFocused ? 'ring-2 ring-white/20' : 'ring-1 ring-white/10'}`}>
          <input
            type="text"
            value={query}
            onChange={(e) => setQuery(e.target.value)}
            onFocus={() => setIsFocused(true)}
            onBlur={() => setIsFocused(false)}
            placeholder="Tell DocDoe your class, upload goal, skill, or topic..."
            aria-label="Search for a topic or exam to prepare for"
            className="w-full px-6 py-4 bg-white/5 border border-white/10 rounded-xl text-white placeholder-white/40 focus:outline-none focus:border-white/20 transition-colors"
          />
          <button
            type="submit"
            disabled={!query.trim()}
            aria-label="Submit your study query"
            className="absolute right-3 top-1/2 -translate-y-1/2 px-4 py-2 bg-white/10 hover:bg-white/20 disabled:opacity-50 disabled:hover:bg-white/10 text-white text-sm font-medium rounded-lg transition-colors"
          >
            Go
          </button>
        </div>
      </form>

      {!isFocused && !query && (
        <div className="space-y-2">
          <p className="text-xs text-white/40 uppercase tracking-wider">Examples</p>
          <div className="flex flex-wrap gap-2">
            {EXAMPLE_QUERIES.map((example, index) => (
              <button
                key={index}
                type="button"
                onClick={() => handleExampleClick(example)}
                aria-label={`Try example: ${example}`}
                className="text-xs px-3 py-1.5 bg-white/5 hover:bg-white/10 text-white/60 hover:text-white/80 rounded-full transition-colors"
              >
                {example}
              </button>
            ))}
          </div>
        </div>
      )}
    </div>
  );
}