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import React, { useState, useEffect } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Upload, BookOpen, Search, File, Send, Trash2, Gem, Loader2 } from 'lucide-react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Textarea } from '@/components/ui/textarea';
import { Alert, AlertTitle, AlertDescription } from '@/components/ui/alert';
import { Checkbox } from '@/components/ui/checkbox';
import { toast, Toaster } from 'sonner';
import GeminiResponseDisplay from './GeminiResponse';

const FileTypeIcons = {
  '.pdf': File,
  '.docx': File,
  '.xlsx': File,
  '.csv': File,
  '.txt': File,
  '.ppt': File,
  '.pptx': File
};

const containerVariants = {
  hidden: { opacity: 0 },
  visible: { 
    opacity: 1,
    transition: {
      delayChildren: 0.2,
      staggerChildren: 0.1
    }
  }
};

const itemVariants = {
  hidden: { y: 20, opacity: 0 },
  visible: { 
    y: 0, 
    opacity: 1,
    transition: {
      type: "spring",
      stiffness: 300,
      damping: 24
    }
  }
};

const chatMessageVariants = {
  hidden: { opacity: 0, x: -20 },
  visible: { 
    opacity: 1, 
    x: 0,
    transition: {
      type: "tween",
      duration: 0.3
    }
  }
};

const MainPage = () => {
  // State Management
  const [documents, setDocuments] = useState([]);
  const [query, setQuery] = useState('');
  const [chatHistory, setChatHistory] = useState([]);
  const [loading, setLoading] = useState(false);
  const [selectedDocs, setSelectedDocs] = useState([]);

  // Error Handling
  const showError = (message, description = '') => {
    toast.error(message, {
      description,
      duration: 4000
    });
  };

  const showSuccess = (message, description = '') => {
    toast.success(message, {
      description,
      duration: 3000
    });
  };

  // Fetch Initial Data
  useEffect(() => {
    fetchDocuments();
    fetchChatHistory();
  }, []);

  const fetchDocuments = async () => {
    try {
      const response = await fetch('http://localhost:8000/documents');
      const data = await response.json();
      setDocuments(data);
    } catch (err) {
      showError('Failed to fetch documents', err.message);
    }
  };

  const fetchChatHistory = async () => {
    try {
      const response = await fetch('http://localhost:8000/chat-history');
      const data = await response.json();
      setChatHistory(data);
    } catch (err) {
      showError('Failed to fetch chat history', err.message);
    }
  };

  const ALLOWED_TYPES = ['.pdf', '.docx', '.xlsx', '.csv', '.txt','.ppt', '.pptx'];

  const handleFileUpload = async (event) => {
    const file = event.target.files[0];
    if (!file) return;

    // File Validation
    const MAX_FILE_SIZE = 35 * 1024 * 1024; // 35MB
    const fileExtension = '.' + file.name.split('.').pop().toLowerCase();

    if (file.size > MAX_FILE_SIZE) {
      showError('File Too Large', 'Maximum file size is 35MB');
      return;
    }

    if (!ALLOWED_TYPES.includes(fileExtension)) {
      showError('Unsupported File Type', `Supported: ${ALLOWED_TYPES.join(', ')}`);
      return;
    }

    const formData = new FormData();
    formData.append('file', file);

    try {
      setLoading(true);
      const response = await fetch('http://localhost:8000/upload', {
        method: 'POST',
        body: formData,
      });

      if (!response.ok) throw new Error('Upload failed');

      const data = await response.json();
      setDocuments([...documents, data]);
      showSuccess('Document Uploaded', `${file.name} processed successfully`);
    } catch (err) {
      showError('Failed to upload document', err.message);
    } finally {
      setLoading(false);
    }
  };

  const handleClearAll = async () => {
    try {
      setLoading(true);
      const response = await fetch('http://localhost:8000/clear-all', {
        method: 'GET',
      });

      if (!response.ok) throw new Error('Clear all failed');

      setDocuments([]);
      setChatHistory([]);
      setSelectedDocs([]);
      showSuccess('Data Cleared', 'All documents and chat history removed');
    } catch (err) {
      showError('Failed to clear all', err.message);
    } finally {
      setLoading(false);
    }
  };

  const handleAnalyze = async () => {
    if (!selectedDocs.length || !query) {
      showError('Incomplete Request', 'Select documents and enter a query');
      return;
    }

    try {
      setLoading(true);
      const response = await fetch('http://localhost:8000/analyze', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          text: query,
          selected_docs: selectedDocs,
        }),
      });

      if (!response.ok) throw new Error('Analysis failed');

      await fetchChatHistory();
      setQuery('');
      showSuccess('Analysis Complete', 'Results are available in chat history');
    } catch (err) {
      showError('Failed to analyze', err.message);
    } finally {
      setLoading(false);
    }
  };

  const formatTimestamp = (timestamp) => {
    return new Date(timestamp).toLocaleString();
  };

  return (
    <motion.div 

      initial="hidden"

      animate="visible"

      variants={containerVariants}

      className="min-h-screen bg-gray-100 p-8"

    >

      <Toaster position="top-right" />

      <motion.div 

        variants={itemVariants}

        className="max-w-6xl mx-auto space-y-6"

      >

        <Card>

          <CardHeader>

            <motion.div 

              variants={itemVariants}

              className="flex items-center justify-between"

            >

              <CardTitle className="text-2xl font-bold flex items-center gap-2">

                <BookOpen className="w-6 h-6" />

                EduScope AI

              </CardTitle>

              <motion.div

                whileHover={{ scale: 1.05 }}

                whileTap={{ scale: 0.95 }}

              >

                <Gem className="w-6 h-6 text-purple-600" />

              </motion.div>

            </motion.div>

          </CardHeader>

          <CardContent>

            <div className="grid grid-cols-12 gap-6">

              {/* Document Management Sidebar */}

              <motion.div 

                variants={itemVariants}

                className="col-span-4 space-y-4"

              >

                <Card>

                  <CardHeader>

                    <CardTitle className="text-lg">Documents</CardTitle>

                  </CardHeader>

                  <CardContent>

                    <div className="space-y-4">

                      <motion.div 

                        whileHover={{ scale: 1.02 }}

                        whileTap={{ scale: 0.98 }}

                      >

                        <Button

                          variant="outline"

                          onClick={() => document.getElementById('file-upload').click()}

                          className="w-full"

                        >

                          <Upload className="w-4 h-4 mr-2" />

                          Upload Document

                        </Button>

                      </motion.div>



                      <motion.div 

                        whileHover={{ scale: 1.02 }}

                        whileTap={{ scale: 0.98 }}

                      >

                        <Button

                          onClick={handleClearAll}

                          disabled={loading}

                          className="w-full"

                        >

                          {loading ? (

                            <Loader2 className="w-4 h-4 mr-2 animate-spin" />

                          ) : (

                            <Trash2 className="w-4 h-4 mr-2" />

                          )}

                          Clear All

                        </Button>

                      </motion.div>



                      <input

                        id="file-upload"

                        type="file"

                        accept={ALLOWED_TYPES.join(',')}

                        className="hidden"

                        onChange={handleFileUpload}

                      />



                      <motion.div 

                        variants={containerVariants}

                        className="space-y-2"

                      >

                        <AnimatePresence>

                          {documents.map((doc) => {

                            const FileIcon = FileTypeIcons[`.${doc.name.split('.').pop().toLowerCase()}`] || File;

                            return (

                              <motion.div 

                                key={doc.id}

                                initial={{ opacity: 0, x: -20 }}

                                animate={{ opacity: 1, x: 0 }}

                                exit={{ opacity: 0, x: 20 }}

                                transition={{ type: "spring", stiffness: 300, damping: 30 }}

                                className="flex items-center space-x-2"

                              >

                                <Checkbox

                                  checked={selectedDocs.includes(doc.id)}

                                  onCheckedChange={(checked) => {

                                    if (checked) {

                                      setSelectedDocs([...selectedDocs, doc.id]);

                                    } else {

                                      setSelectedDocs(selectedDocs.filter(id => id !== doc.id));

                                    }

                                  }}

                                />

                                <div className="flex items-center space-x-2">

                                  <FileIcon className="w-4 h-4" />

                                  <span className="text-sm truncate">{doc.name}</span>

                                </div>

                              </motion.div>

                            );

                          })}

                        </AnimatePresence>

                      </motion.div>

                    </div>

                  </CardContent>

                </Card>

              </motion.div>



              {/* Chat Interface */}

              <motion.div 

                variants={itemVariants}

                className="col-span-8 space-y-4"

              >

                <motion.div 

                  className="h-[500px] overflow-y-auto bg-white rounded-lg p-4 border"

                  initial={{ opacity: 0 }}

                  animate={{ opacity: 1 }}

                >

                  <AnimatePresence>

                    {chatHistory.map((message) => (

                      <motion.div

                        key={message.id}

                        variants={chatMessageVariants}

                        initial="hidden"

                        animate="visible"

                        exit={{ opacity: 0, x: 20 }}

                        className={`mb-4 ${message.type === 'assistant' ? 'ml-4' : 'mr-4'}`}

                      >

                        <div

                          className={`p-3 rounded-lg ${

                            message.type === 'assistant'

                              ? 'bg-blue-100'

                              : 'bg-gray-100'

                          }`}

                        >

                          <div className="text-sm text-gray-500 mb-1">

                            {message.type === 'assistant' ? 'AI Assistant' : 'You'} •{' '}

                            {formatTimestamp(message.timestamp)}

                          </div>

                          <div className="text-gray-800">

                            {message.content.includes('pareto_analysis') || message.content.includes('<html') 

                              ? <GeminiResponseDisplay responseStr={message.content} /> 

                              : message.content}

                          </div>

                          {message.referenced_docs.length > 0 && (

                            <div className="text-xs text-gray-500 mt-2">

                              Referenced documents:{' '}

                              {message.referenced_docs

                                .map(

                                  (docId) =>

                                    documents.find((d) => d.id === docId)?.name

                                )

                                .join(', ')}

                            </div>

                          )}

                        </div>

                      </motion.div>

                    ))}

                  </AnimatePresence>

                </motion.div>



                <motion.div 

                  variants={itemVariants}

                  className="flex gap-2"

                >

                  <Textarea

                    value={query}

                    onChange={(e) => setQuery(e.target.value)}

                    placeholder="Ask a question about the selected documents..."

                    className="flex-1"

                  />

                  <motion.div

                    whileHover={{ scale: 1.05 }}

                    whileTap={{ scale: 0.95 }}

                  >

                    <Button

                      onClick={handleAnalyze}

                      disabled={loading}

                      className="self-end"

                    >

                      {loading ? (

                        <Loader2 className="w-4 h-4 mr-2 animate-spin" />

                      ) : (

                        <>

                          <Send className="w-4 h-4 mr-2" />

                          Send

                        </>

                      )}

                    </Button>

                  </motion.div>

                </motion.div>

              </motion.div>

            </div>

          </CardContent>

        </Card>

      </motion.div>

    </motion.div>
  );
};

export default MainPage;