// frontend-fetch-example.js
// Frontend code snippet for Reuben OS to fetch and display session files

// React Component Example for Session Management
import React, { useState, useEffect, useCallback } from 'react';

// Configuration
const API_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000';
const POLL_INTERVAL = 5000; // Poll every 5 seconds

// ===== SESSION MANAGER COMPONENT =====
export function SessionManager() {
  const [sessionId, setSessionId] = useState('');
  const [files, setFiles] = useState([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState(null);
  const [quizDetected, setQuizDetected] = useState(false);

  // Generate a new session ID on component mount
  useEffect(() => {
    const generateSessionId = () => {
      const timestamp = Date.now();
      const random = Math.random().toString(36).substring(2, 9);
      return `session_${timestamp}_${random}`;
    };

    // Check if session ID exists in localStorage, otherwise generate new one
    const storedSessionId = localStorage.getItem('reubenOSSessionId');
    if (storedSessionId) {
      setSessionId(storedSessionId);
    } else {
      const newSessionId = generateSessionId();
      setSessionId(newSessionId);
      localStorage.setItem('reubenOSSessionId', newSessionId);
    }
  }, []);

  // Fetch files for the current session
  const fetchFiles = useCallback(async () => {
    if (!sessionId) return;

    setLoading(true);
    setError(null);

    try {
      const response = await fetch(`${API_URL}/api/mcp-handler?sessionId=${sessionId}`);

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }

      const data = await response.json();

      if (data.success) {
        setFiles(data.files || []);

        // Check if quiz.json exists
        const hasQuiz = data.files.some(file => file.name === 'quiz.json');
        setQuizDetected(hasQuiz);
      } else {
        setError(data.error || 'Failed to fetch files');
      }
    } catch (err) {
      console.error('Error fetching files:', err);
      setError(err.message);
    } finally {
      setLoading(false);
    }
  }, [sessionId]);

  // Set up polling
  useEffect(() => {
    if (!sessionId) return;

    // Initial fetch
    fetchFiles();

    // Set up polling interval
    const interval = setInterval(fetchFiles, POLL_INTERVAL);

    return () => clearInterval(interval);
  }, [sessionId, fetchFiles]);

  // Handle manual refresh
  const handleRefresh = () => {
    fetchFiles();
  };

  // Copy session ID to clipboard
  const copySessionId = () => {
    navigator.clipboard.writeText(sessionId);
    alert('Session ID copied to clipboard!');
  };

  return (
    <div className="session-manager">
      <div className="session-header">
        <h2>Session Manager</h2>
        <div className="session-info">
          <span>Session ID: {sessionId}</span>
          <button onClick={copySessionId}>Copy ID</button>
        </div>
        <button onClick={handleRefresh} disabled={loading}>
          {loading ? 'Loading...' : 'Refresh'}
        </button>
      </div>

      {error && (
        <div className="error-message">
          Error: {error}
        </div>
      )}

      {quizDetected && (
        <div className="quiz-alert">
          🎯 Quiz Detected! Click to launch Quiz App
          <button onClick={() => launchQuizApp(sessionId)}>
            Launch Quiz
          </button>
        </div>
      )}

      <div className="files-list">
        <h3>Files ({files.length})</h3>
        {files.length === 0 ? (
          <p>No files yet. Use Claude to save files to this session.</p>
        ) : (
          <ul>
            {files.map((file, index) => (
              <FileItem key={index} file={file} sessionId={sessionId} />
            ))}
          </ul>
        )}
      </div>
    </div>
  );
}

// ===== FILE ITEM COMPONENT =====
function FileItem({ file, sessionId }) {
  const [showContent, setShowContent] = useState(false);

  const handleDownload = () => {
    // Create a download link
    const blob = new Blob([file.content || ''], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = file.name;
    a.click();
    URL.revokeObjectURL(url);
  };

  const getFileIcon = (fileName) => {
    if (fileName.endsWith('.dart')) return '🎯';
    if (fileName.endsWith('.tex')) return '📜';
    if (fileName.endsWith('.json')) return '📋';
    if (fileName.endsWith('.js') || fileName.endsWith('.ts')) return '📝';
    if (fileName.endsWith('.py')) return '🐍';
    return '📄';
  };

  return (
    <li className="file-item">
      <div className="file-header">
        <span className="file-icon">{getFileIcon(file.name)}</span>
        <span className="file-name">{file.name}</span>
        <span className="file-size">({(file.size / 1024).toFixed(2)} KB)</span>
        <button onClick={() => setShowContent(!showContent)}>
          {showContent ? 'Hide' : 'Show'}
        </button>
        <button onClick={handleDownload}>Download</button>
      </div>

      {showContent && file.content && (
        <div className="file-content">
          <pre>{file.content.substring(0, 500)}</pre>
          {file.content.length > 500 && <p>... (truncated)</p>}
        </div>
      )}
    </li>
  );
}

// ===== QUIZ APP LAUNCHER =====
function launchQuizApp(sessionId) {
  // This function would navigate to your Quiz app with the session ID
  window.location.href = `/apps/quiz?sessionId=${sessionId}`;
}

// ===== UTILITY FUNCTIONS =====

// Function to save a file from the frontend (for testing)
export async function saveFile(sessionId, fileName, content) {
  try {
    const response = await fetch(`${API_URL}/api/mcp-handler`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        sessionId,
        action: 'save_file',
        fileName,
        content,
      }),
    });

    const data = await response.json();
    return data;
  } catch (error) {
    console.error('Error saving file:', error);
    throw error;
  }
}

// Function to clear all files for a session
export async function clearSession(sessionId) {
  try {
    const response = await fetch(`${API_URL}/api/mcp-handler`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        sessionId,
        action: 'clear_session',
        fileName: '',
        content: '',
      }),
    });

    const data = await response.json();
    return data;
  } catch (error) {
    console.error('Error clearing session:', error);
    throw error;
  }
}

// ===== FLUTTER APP COMPONENT =====
export function FlutterAppViewer({ sessionId }) {
  const [dartFiles, setDartFiles] = useState([]);

  useEffect(() => {
    const fetchDartFiles = async () => {
      try {
        const response = await fetch(`${API_URL}/api/mcp-handler?sessionId=${sessionId}`);
        const data = await response.json();

        if (data.success) {
          // Filter only .dart files
          const dartOnly = data.files.filter(f => f.name.endsWith('.dart'));
          setDartFiles(dartOnly);
        }
      } catch (error) {
        console.error('Error fetching Dart files:', error);
      }
    };

    if (sessionId) {
      fetchDartFiles();
      const interval = setInterval(fetchDartFiles, POLL_INTERVAL);
      return () => clearInterval(interval);
    }
  }, [sessionId]);

  const openInZapp = (file) => {
    // Open Dart code in Zapp runner
    const zappUrl = 'https://zapp.run/';
    const code = encodeURIComponent(file.content);
    window.open(`${zappUrl}?code=${code}`, '_blank');
  };

  return (
    <div className="flutter-viewer">
      <h3>Flutter/Dart Files</h3>
      {dartFiles.map((file, index) => (
        <div key={index} className="dart-file">
          <span>{file.name}</span>
          <button onClick={() => openInZapp(file)}>
            Open in Zapp
          </button>
        </div>
      ))}
    </div>
  );
}

// ===== LATEX VIEWER COMPONENT =====
export function LaTeXViewer({ sessionId }) {
  const [texFiles, setTexFiles] = useState([]);

  useEffect(() => {
    const fetchTexFiles = async () => {
      try {
        const response = await fetch(`${API_URL}/api/mcp-handler?sessionId=${sessionId}`);
        const data = await response.json();

        if (data.success) {
          // Filter only .tex files
          const texOnly = data.files.filter(f => f.name.endsWith('.tex'));
          setTexFiles(texOnly);
        }
      } catch (error) {
        console.error('Error fetching LaTeX files:', error);
      }
    };

    if (sessionId) {
      fetchTexFiles();
      const interval = setInterval(fetchTexFiles, POLL_INTERVAL);
      return () => clearInterval(interval);
    }
  }, [sessionId]);

  return (
    <div className="latex-viewer">
      <h3>LaTeX Documents</h3>
      {texFiles.map((file, index) => (
        <div key={index} className="tex-file">
          <span>{file.name}</span>
          <button onClick={() => openInLatexEditor(file)}>
            Open in Editor
          </button>
        </div>
      ))}
    </div>
  );
}

function openInLatexEditor(file) {
  // Your LaTeX editor integration
  window.location.href = `/apps/latex-studio?file=${file.name}`;
}

// ===== EXAMPLE USAGE IN NEXT.JS PAGE =====
/*
// pages/index.js or pages/dashboard.js

import { SessionManager } from '../components/SessionManager';

export default function Dashboard() {
  return (
    <div className="dashboard">
      <h1>Reuben OS - File Manager</h1>
      <SessionManager />
    </div>
  );
}
*/

// ===== CSS STYLES (add to your global styles or styled-components) =====
const styles = `
.session-manager {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.session-header {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.session-info {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 0;
  font-family: monospace;
  background: white;
  padding: 10px;
  border-radius: 4px;
}

.error-message {
  background: #fee;
  color: #c00;
  padding: 10px;
  border-radius: 4px;
  margin: 10px 0;
}

.quiz-alert {
  background: #efe;
  color: #060;
  padding: 15px;
  border-radius: 4px;
  margin: 10px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.files-list {
  background: white;
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.file-item {
  list-style: none;
  padding: 10px;
  border-bottom: 1px solid #eee;
}

.file-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon {
  font-size: 20px;
}

.file-name {
  flex: 1;
  font-weight: 500;
}

.file-size {
  color: #666;
  font-size: 0.9em;
}

.file-content {
  margin-top: 10px;
  padding: 10px;
  background: #f5f5f5;
  border-radius: 4px;
  overflow-x: auto;
}

.file-content pre {
  margin: 0;
  font-size: 0.9em;
  line-height: 1.4;
}

button {
  padding: 6px 12px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
`;