'use client';

import { useRef, useState } from 'react';

const PRESET_STYLES = [
  { id: 'plush', label: '毛绒玩偶' },
  { id: 'mecha', label: '机甲风' },
  { id: 'kawaii', label: '可爱萌系' },
  { id: 'blueprint', label: '专利蓝图' },
  { id: 'cyber', label: '赛博朋克' },
  { id: 'minimal', label: '极简' },
];

export type PromptPanelProps = {
  onGenerate: (opts: { prompt: string; refImages: string[]; count: number; style?: string }) => void;
  loading: boolean;
};

export default function PromptPanel({ onGenerate, loading }: PromptPanelProps) {
  const [prompt, setPrompt] = useState('AI 毛绒陪伴玩具，机甲头盔，胸前挂 M logo，橙白配色，圆胖体型');
  const [refs, setRefs] = useState<string[]>([]);
  const [count, setCount] = useState(8);
  const [style, setStyle] = useState<string>('');
  const fileInput = useRef<HTMLInputElement>(null);

  function handleFiles(files: FileList | null) {
    if (!files) return;
    Array.from(files).slice(0, 4 - refs.length).forEach(f => {
      const r = new FileReader();
      r.onload = () => setRefs(prev => [...prev, r.result as string]);
      r.readAsDataURL(f);
    });
  }

  function submit() {
    if (!prompt.trim() || loading) return;
    onGenerate({ prompt: prompt.trim(), refImages: refs, count, style: style || undefined });
  }

  return (
    <div className="card p-7 space-y-6">
      <div>
        <label className="block text-xs font-medium text-zinc-500 uppercase tracking-wider mb-2.5">
          Prompt
        </label>
        <textarea
          value={prompt}
          onChange={e => setPrompt(e.target.value)}
          onKeyDown={e => { if (e.key === 'Enter' && (e.metaKey || e.ctrlKey)) submit(); }}
          rows={3}
          placeholder="描述要生成的玩具意向…"
          className="field text-[15px] leading-relaxed"
        />
        <p className="mt-2 text-[11px] text-zinc-400 flex items-center gap-1.5">
          按 <kbd className="kbd">⌘</kbd><kbd className="kbd">↵</kbd> 提交
        </p>
      </div>

      <div>
        <label className="block text-xs font-medium text-zinc-500 uppercase tracking-wider mb-2.5">
          参考图 <span className="text-zinc-400 normal-case tracking-normal">· 可选，最多 4 张</span>
        </label>
        <div className="flex flex-wrap gap-2.5">
          {refs.map((r, i) => (
            <div key={i} className="relative w-20 h-20 rounded-xl overflow-hidden ring-1 ring-zinc-200 group">
              <img src={r} alt="ref" className="w-full h-full object-cover" />
              <button
                onClick={() => setRefs(prev => prev.filter((_, j) => j !== i))}
                className="absolute top-1 right-1 w-5 h-5 rounded-full bg-zinc-900 text-white text-[10px] opacity-0 group-hover:opacity-100 transition-opacity shadow-md"
              >✕</button>
            </div>
          ))}
          {refs.length < 4 && (
            <button
              onClick={() => fileInput.current?.click()}
              className="w-20 h-20 rounded-xl border-2 border-dashed border-zinc-200 hover:border-zinc-400 hover:bg-zinc-50 text-zinc-400 hover:text-zinc-600 text-2xl transition-colors flex items-center justify-center"
            >+</button>
          )}
          <input
            ref={fileInput}
            type="file"
            accept="image/*"
            multiple
            hidden
            onChange={e => handleFiles(e.target.files)}
          />
        </div>
      </div>

      <div>
        <label className="block text-xs font-medium text-zinc-500 uppercase tracking-wider mb-2.5">
          风格
        </label>
        <div className="flex flex-wrap gap-1.5">
          <button
            onClick={() => setStyle('')}
            className={style === '' ? 'btn btn-primary text-xs px-3 py-1.5' : 'btn btn-outline text-xs px-3 py-1.5'}
          >无</button>
          {PRESET_STYLES.map(s => (
            <button
              key={s.id}
              onClick={() => setStyle(s.label)}
              className={style === s.label ? 'btn btn-primary text-xs px-3 py-1.5' : 'btn btn-outline text-xs px-3 py-1.5'}
            >{s.label}</button>
          ))}
        </div>
      </div>

      <div className="flex items-end justify-between gap-4 pt-2">
        <div>
          <label className="block text-xs font-medium text-zinc-500 uppercase tracking-wider mb-2.5">
            数量
          </label>
          <div className="seg">
            {[4, 8, 12].map(n => (
              <button
                key={n}
                onClick={() => setCount(n)}
                className={`seg-item ${count === n ? 'seg-item-active' : ''}`}
              >{n} 张</button>
            ))}
          </div>
        </div>
        <button
          onClick={submit}
          disabled={loading || !prompt.trim()}
          className="btn btn-primary px-5 py-2.5 disabled:opacity-40 disabled:cursor-not-allowed"
        >
          {loading ? (
            <>
              <svg width="14" height="14" viewBox="0 0 24 24" className="animate-spin" fill="none" stroke="currentColor" strokeWidth="2">
                <path d="M12 2a10 10 0 0 1 10 10" strokeLinecap="round" />
              </svg>
              生成中
            </>
          ) : (
            <>
              批量生成
              <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
                <path d="M5 12h14M13 5l7 7-7 7" strokeLinecap="round" strokeLinejoin="round" />
              </svg>
            </>
          )}
        </button>
      </div>
    </div>
  );
}