import { useRef, useCallback, type DragEvent } from 'react';
import { useInputBarStore } from '../store/inputBar';
import { UniversalUpload } from './UniversalUpload';
import { KeyframeUpload } from './KeyframeUpload';
import { PromptInput } from './PromptInput';
import { Toolbar } from './Toolbar';
import { showToast } from './Toast';
import styles from './InputBar.module.css';

export function InputBar() {
  const mode = useInputBarStore((s) => s.mode);
  const addReferences = useInputBarStore((s) => s.addReferences);
  const setFirstFrame = useInputBarStore((s) => s.setFirstFrame);
  const references = useInputBarStore((s) => s.references);
  const barRef = useRef<HTMLDivElement>(null);

  const handleDragOver = useCallback((e: DragEvent) => {
    e.preventDefault();
    if (barRef.current) {
      barRef.current.style.borderColor = '#00b8e6';
    }
  }, []);

  const handleDragLeave = useCallback(() => {
    if (barRef.current) {
      barRef.current.style.borderColor = '#2a2a38';
    }
  }, []);

  const handleDrop = useCallback((e: DragEvent) => {
    e.preventDefault();
    if (barRef.current) {
      barRef.current.style.borderColor = '#2a2a38';
    }
    const IMAGE_MAX = 20 * 1024 * 1024;
    const VIDEO_MAX = 100 * 1024 * 1024;
    const files = Array.from(e.dataTransfer.files).filter(
      (f) => f.type.startsWith('image/') || f.type.startsWith('video/')
    );
    if (!files.length) return;

    const valid: File[] = [];
    for (const f of files) {
      const limit = f.type.startsWith('video/') ? VIDEO_MAX : IMAGE_MAX;
      if (f.size > limit) {
        showToast(f.type.startsWith('video/') ? '视频文件不能超过100MB' : '图片文件不能超过20MB');
      } else {
        valid.push(f);
      }
    }
    if (!valid.length) return;

    if (mode === 'universal') {
      const remaining = 5 - references.length;
      if (remaining <= 0) {
        showToast('最多上传5张参考内容');
        return;
      }
      addReferences(valid);
      if (valid.length > remaining) {
        showToast('最多上传5张参考内容');
      }
    } else {
      setFirstFrame(valid[0]);
    }
  }, [mode, references.length, addReferences, setFirstFrame]);

  return (
    <div className={styles.wrapper}>
      <div className={styles.container}>
        <div
          ref={barRef}
          className={styles.bar}
          onDragOver={handleDragOver}
          onDragLeave={handleDragLeave}
          onDrop={handleDrop}
        >
          {/* Upper area: Upload + Prompt */}
          <div className={styles.inputArea}>
            {mode === 'universal' ? <UniversalUpload /> : <KeyframeUpload />}
            <PromptInput />
          </div>

          {/* Divider */}
          <div className={styles.divider} />

          {/* Toolbar */}
          <Toolbar />
        </div>
      </div>
    </div>
  );
}