frontend/src/components/sections/CVUpload.tsx

import React from 'react';
import { motion } from 'framer-motion';
import { Upload, FileText, AlertCircle } from 'lucide-react';
import { Card, Button } from '@/components/common';
import { useJobStore } from '@/store/appStore';
import { jobsAPI } from '@/utils/api';
import { readFileAsArrayBuffer } from '@/utils/helpers';

interface CVUploadProps {
  onSuccess?: (filename: string) => void;
  onError?: (error: string) => void;
}

const CVUpload: React.FC<CVUploadProps> = ({ onSuccess, onError }) => {
  const [isDragging, setIsDragging] = React.useState(false);
  const [error, setError] = React.useState<string | null>(null);
  const { cvTemplate, setCVTemplate } = useJobStore();
  const fileInputRef = React.useRef<HTMLInputElement>(null);

  const handleDragOver = (e: React.DragEvent) => {
    e.preventDefault();
    setIsDragging(true);
  };

  const handleDragLeave = () => {
    setIsDragging(false);
  };

  const handleFileSelect = async (files: FileList | null) => {
    if (!files || files.length === 0) return;

    const file = files[0];
    setError(null);

    // Validate file type
    if (!file.name.endsWith('.docx')) {
      setError('Only .docx files are supported');
      onError?.('Only .docx files are supported');
      return;
    }

    // Validate file size (max 10MB)
    if (file.size > 10 * 1024 * 1024) {
      setError('File size must be less than 10MB');
      onError?.('File size must be less than 10MB');
      return;
    }

    try {
      const arrayBuffer = await readFileAsArrayBuffer(file);
      const response = await jobsAPI.uploadCV(file);

      if (response.success) {
        setCVTemplate({
          filename: file.name,
          uploadedAt: new Date().toISOString(),
          size: file.size,
          content: arrayBuffer,
        });
        onSuccess?.(file.name);
      }
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to upload CV';
      setError(message);
      onError?.(message);
    }
  };

  const handleDrop = (e: React.DragEvent) => {
    e.preventDefault();
    setIsDragging(false);
    handleFileSelect(e.dataTransfer.files);
  };

  return (
    <div className="w-full">
      {cvTemplate ? (
        <Card glow innerGlow>
          <div className="flex items-start gap-4">
            <div className="p-3 bg-emerald-500/20 rounded-lg">
              <FileText className="w-6 h-6 text-emerald-400" />
            </div>
            <div className="flex-1">
              <h3 className="font-semibold text-white mb-1">
                {cvTemplate.filename}
              </h3>
              <p className="text-sm text-slate-400 mb-3">
                Uploaded on{' '}
                {new Date(cvTemplate.uploadedAt).toLocaleDateString()}
              </p>
              <Button
                size="sm"
                variant="outline"
                onClick={() => {
                  setCVTemplate(null);
                  setError(null);
                }}
              >
                Change CV
              </Button>
            </div>
          </div>
        </Card>
      ) : (
        <motion.div
          onDragOver={handleDragOver}
          onDragLeave={handleDragLeave}
          onDrop={handleDrop}
          animate={isDragging ? { scale: 1.02 } : { scale: 1 }}
          className={`border-2 border-dashed rounded-xl p-8 text-center transition-all cursor-pointer ${
            isDragging
              ? 'border-emerald-500 bg-emerald-500/10'
              : 'border-slate-600 bg-slate-800/30 hover:border-emerald-400'
          }`}
          onClick={() => fileInputRef.current?.click()}
        >
          <motion.div
            animate={isDragging ? { scale: 1.1, rotate: 12 } : { scale: 1, rotate: 0 }}
            className="flex justify-center mb-4"
          >
            <div className="p-3 bg-emerald-500/20 rounded-lg">
              <Upload className="w-8 h-8 text-emerald-400" />
            </div>
          </motion.div>

          <h3 className="text-lg font-semibold text-white mb-2">
            Drop your CV or click to browse
          </h3>
          <p className="text-slate-400 text-sm mb-4">
            Supported format: .docx (Word Document)
          </p>
          <p className="text-xs text-slate-500">Max file size: 10MB</p>

          <input
            ref={fileInputRef}
            type="file"
            accept=".docx"
            onChange={(e) => handleFileSelect(e.target.files)}
            className="hidden"
          />
        </motion.div>
      )}

      {error && (
        <motion.div
          initial={{ opacity: 0, y: -4 }}
          animate={{ opacity: 1, y: 0 }}
          className="mt-4 p-4 bg-red-500/10 border border-red-500/30 rounded-lg flex gap-3"
        >
          <AlertCircle className="w-5 h-5 text-red-400 flex-shrink-0" />
          <p className="text-sm text-red-200">{error}</p>
        </motion.div>
      )}
    </div>
  );
};

export default CVUpload;