'use client';

import React, { useRef, useEffect } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Trash2, RefreshCw } from 'lucide-react';
import { cn } from '@/public/lib/utils';

interface ScriptTabContentProps {
  taskSketch: any[];
  currentSketchIndex: number;
  onSketchSelect: (index: number) => void;
}

export function ScriptTabContent({
  taskSketch = [],
  currentSketchIndex = 0,
  onSketchSelect
}: ScriptTabContentProps) {
  const thumbnailsRef = useRef<HTMLDivElement>(null);
  const scriptsRef = useRef<HTMLDivElement>(null);

  // 确保 taskSketch 是数组
  const sketches = Array.isArray(taskSketch) ? taskSketch : [];

  // 自动滚动到选中项
  useEffect(() => {
    if (thumbnailsRef.current && scriptsRef.current) {
      const thumbnailContainer = thumbnailsRef.current;
      const scriptContainer = scriptsRef.current;
      
      // 计算缩略图滚动位置
      const thumbnailWidth = thumbnailContainer.children[0]?.clientWidth ?? 0;
      const thumbnailGap = 16; // gap-4 = 16px
      const thumbnailScrollPosition = (thumbnailWidth + thumbnailGap) * currentSketchIndex;
      
      // 计算脚本文字滚动位置
      const scriptElement = scriptContainer.children[currentSketchIndex] as HTMLElement;
      const scriptScrollPosition = scriptElement?.offsetLeft ?? 0;
      
      // 平滑滚动到目标位置
      thumbnailContainer.scrollTo({
        left: thumbnailScrollPosition - thumbnailContainer.clientWidth / 2 + thumbnailWidth / 2,
        behavior: 'smooth'
      });
      
      scriptContainer.scrollTo({
        left: scriptScrollPosition - scriptContainer.clientWidth / 2 + scriptElement?.clientWidth / 2,
        behavior: 'smooth'
      });
    }
  }, [currentSketchIndex]);

  // 如果没有数据，显示空状态
  if (sketches.length === 0) {
    return (
      <div className="flex flex-col items-center justify-center min-h-[400px] text-white/50">
        <p>No sketch data</p>
      </div>
    );
  }

  return (
    <div className="flex flex-col gap-6">
      {/* 上部分 */}
      <motion.div 
        className="space-y-6"
        initial={{ opacity: 0, y: 20 }}
        animate={{ opacity: 1, y: 0 }}
      >
        {/* 分镜缩略图行 */}
        <div className="relative">
          <div 
            ref={thumbnailsRef}
            className="flex gap-4 overflow-x-auto pb-2 pt-2 hide-scrollbar"
          >
            {sketches.map((sketch, index) => (
              <motion.div
                key={sketch.id || index}
                className={cn(
                  'relative flex-shrink-0 w-32 aspect-video rounded-lg overflow-hidden cursor-pointer',
                  currentSketchIndex === index ? 'ring-2 ring-blue-500' : 'hover:ring-2 hover:ring-blue-500/50'
                )}
                onClick={() => onSketchSelect(index)}
                whileHover={{ scale: 1.05 }}
                whileTap={{ scale: 0.95 }}
              >
                <img 
                  src={sketch.url} 
                  alt={`Sketch ${index + 1}`}
                  className="w-full h-full object-cover"
                />
                <div className="absolute bottom-0 left-0 right-0 p-1 bg-gradient-to-t from-black/60 to-transparent">
                  <span className="text-xs text-white/90">Scene {index + 1}</span>
                </div>
              </motion.div>
            ))}
          </div>
        </div>

        {/* 脚本预览行 - 单行滚动 */}
        <div className="relative group">
          <div 
            ref={scriptsRef}
            className="flex overflow-x-auto hide-scrollbar py-2 gap-1"
          >
            {sketches.map((script, index) => {
              const isActive = currentSketchIndex === index;
              return (
                <motion.div
                  key={index}
                  className={cn(
                    'flex-shrink-0 cursor-pointer transition-all duration-300',
                    isActive ? 'text-white' : 'text-white/50 hover:text-white/80'
                  )}
                  onClick={() => onSketchSelect(index)}
                  initial={false}
                  animate={{
                    scale: isActive ? 1.02 : 1,
                  }}
                >
                  <div className="flex items-center gap-2">
                    <span className="text-sm whitespace-nowrap">
                      {script.script}
                    </span>
                    {index < sketches.length - 1 && (
                      <span className="text-white/20">|</span>
                    )}
                  </div>
                </motion.div>
              );
            })}
          </div>
          
          {/* 渐变遮罩 */}
          <div className="absolute left-0 top-0 bottom-0 w-8 bg-gradient-to-r from-[#1a1b1e] to-transparent pointer-events-none opacity-0 group-hover:opacity-100 transition-opacity" />
          <div className="absolute right-0 top-0 bottom-0 w-8 bg-gradient-to-l from-[#1a1b1e] to-transparent pointer-events-none opacity-0 group-hover:opacity-100 transition-opacity" />
        </div>
      </motion.div>

      {/* 下部分 */}
      <motion.div 
        className="grid grid-cols-2 gap-6"
        initial={{ opacity: 0, y: 20 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ delay: 0.1 }}
      >
        {/* 左列：脚本编辑器 */}
        <div className="space-y-2">
          <motion.textarea
            className="w-full h-full p-4 rounded-lg bg-white/5 backdrop-blur-sm border border-white/10 
              text-white/90 text-sm resize-none focus:outline-none focus:ring-2 focus:ring-blue-500"
            value={sketches[currentSketchIndex]?.script}
            onChange={() => {}}
            layoutId="script-editor"
          />
        </div>

        {/* 右列：预览和操作 */}
        <div className="space-y-4">
          {/* 选中的分镜预览 */}
          <motion.div
            className="aspect-video rounded-lg overflow-hidden"
            layoutId={`sketch-preview-${currentSketchIndex}`}
          >
            <img
              src={sketches[currentSketchIndex]?.url}
              alt={`Sketch ${currentSketchIndex + 1}`}
              className="w-full h-full object-cover"
            />
          </motion.div>

          {/* 操作按钮 */}
          <div className="grid grid-cols-2 gap-2">
            <button
              onClick={() => console.log('Delete sketch')}
              className="flex items-center justify-center gap-2 px-4 py-3 bg-red-500/10 hover:bg-red-500/20 
                text-red-500 rounded-lg transition-colors"
            >
              <Trash2 className="w-4 h-4" />
              <span>Delete sketch</span>
            </button>
            <button
              onClick={() => console.log('Regenerate')}
              className="flex items-center justify-center gap-2 px-4 py-3 bg-blue-500/10 hover:bg-blue-500/20 
                text-blue-500 rounded-lg transition-colors"
            >
              <RefreshCw className="w-4 h-4" />
              <span>Regenerate</span>
            </button>
          </div>
        </div>
      </motion.div>
    </div>
  );
}