server.js

// ─────────────────────────────────────────────
//  TherapistMatch — Backend Server (Node.js / Express)
//  Run: npm install && node server.js
// ─────────────────────────────────────────────

const express = require('express');
const cors = require('cors');
const path = require('path');

const app = express();
const PORT = process.env.PORT || 3000;

// ─── MIDDLEWARE ───
app.use(cors());
app.use(express.json());
app.use(express.static(__dirname));

// ─────────────────────────────────────────────
//  In-Memory "Database" (replace with real DB)
// ─────────────────────────────────────────────
let bookings = [];

const therapists = [
  {
    id: 1,
    name: 'Dr. Meera Rajan',
    title: 'Clinical Psychologist',
    experience: 9,
    specializations: ['Anxiety', 'CBT', 'Mindfulness'],
    rating: 4.9,
    reviews: 128,
    price: 900,
    currency: 'INR',
    modes: ['video', 'phone'],
    languages: ['English', 'Hindi', 'Tamil'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=47',
    verified: true,
    bio: 'Dr. Meera brings a warm, CBT-integrated approach to anxiety and stress management. She focuses on practical tools and long-term wellbeing.',
  },
  {
    id: 2,
    name: 'Dr. Aryan Bose',
    title: 'Trauma Specialist',
    experience: 12,
    specializations: ['Trauma', 'DBT', 'Depression'],
    rating: 4.8,
    reviews: 96,
    price: 700,
    currency: 'INR',
    modes: ['inperson', 'video'],
    languages: ['English', 'Bengali', 'Hindi'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=12',
    verified: true,
    bio: 'Dr. Aryan specializes in PTSD and complex trauma using DBT and somatic approaches, with 12 years of clinical experience.',
  },
  {
    id: 3,
    name: 'Dr. Sana Qureshi',
    title: 'Couples Therapist',
    experience: 7,
    specializations: ['Couples', 'Anxiety', 'Communication'],
    rating: 4.9,
    reviews: 74,
    price: 1200,
    currency: 'INR',
    modes: ['video', 'phone'],
    languages: ['English', 'Urdu', 'Hindi'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=32',
    verified: true,
    bio: 'Dr. Sana brings the Gottman Method and EFT to couples work, helping partners rebuild trust and communication.',
  },
  {
    id: 4,
    name: 'Dr. Vikram Nair',
    title: 'Psychiatrist',
    experience: 15,
    specializations: ['Depression', 'CBT', 'OCD'],
    rating: 4.7,
    reviews: 211,
    price: 1500,
    currency: 'INR',
    modes: ['inperson', 'video'],
    languages: ['English', 'Malayalam', 'Hindi'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=68',
    verified: true,
    bio: 'One of India\'s leading psychiatrists, Dr. Vikram combines pharmacotherapy with CBT for depression and OCD.',
  },
  {
    id: 5,
    name: 'Dr. Priya Sharma',
    title: 'EMDR Therapist',
    experience: 10,
    specializations: ['Anxiety', 'PTSD', 'EMDR'],
    rating: 5.0,
    reviews: 62,
    price: 800,
    currency: 'INR',
    modes: ['video'],
    languages: ['English', 'Hindi'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=25',
    verified: true,
    bio: 'Certified EMDR therapist specializing in trauma resolution, anxiety disorders, and phobias through evidence-based desensitization therapy.',
  },
  {
    id: 6,
    name: 'Dr. Rahul Das',
    title: 'Family Therapist',
    experience: 8,
    specializations: ['Family', 'Depression', 'Couples'],
    rating: 4.8,
    reviews: 88,
    price: 600,
    currency: 'INR',
    modes: ['inperson', 'phone'],
    languages: ['English', 'Bengali', 'Hindi', 'Odia'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=59',
    verified: true,
    bio: 'Dr. Rahul focuses on systemic family therapy, helping families navigate conflict, grief, and relationship repair.',
  },
  {
    id: 7,
    name: 'Dr. Maya Iyer',
    title: 'Clinical Psychologist',
    experience: 5,
    specializations: ['Anxiety', 'Depression'],
    rating: 4.6,
    reviews: 45,
    price: 600,
    currency: 'INR',
    modes: ['video'],
    languages: ['English'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=10',
    verified: true,
    bio: 'Focuses on modern anxiety and depression treatments.'
  },
  {
    id: 8,
    name: 'Dr. Rohan Mehta',
    title: 'Trauma Specialist',
    experience: 14,
    specializations: ['Trauma', 'CBT'],
    rating: 4.8,
    reviews: 112,
    price: 1000,
    currency: 'INR',
    modes: ['inperson'],
    languages: ['English', 'Hindi'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=11',
    verified: true,
    bio: 'Extensive trauma specialization via in-person consultations.'
  },
  {
    id: 9,
    name: 'Dr. Anjali Verma',
    title: 'Marriage Counselor',
    experience: 9,
    specializations: ['Couples', 'Anxiety'],
    rating: 4.9,
    reviews: 89,
    price: 950,
    currency: 'INR',
    modes: ['video', 'inperson'],
    languages: ['English'],
    availability: true,
    avatar: 'https://i.pravatar.cc/100?img=20',
    verified: true,
    bio: 'Deep insight into modern couples therapy.'
  }
];

// ─────────────────────────────────────────────
//  ROUTES
// ─────────────────────────────────────────────

// Health check
app.get('/api/health', (req, res) => {
  res.json({ status: 'ok', timestamp: new Date().toISOString(), service: 'TherapistMatch API' });
});

// ─── GET all therapists ───
app.get('/api/therapists', (req, res) => {
  const { specialization, minPrice, maxPrice, mode, language, sort } = req.query;

  let results = [...therapists];

  if (specialization) {
    results = results.filter(t =>
      t.specializations.some(s => s.toLowerCase().includes(specialization.toLowerCase()))
    );
  }
  if (minPrice) results = results.filter(t => t.price >= parseInt(minPrice));
  if (maxPrice) results = results.filter(t => t.price <= parseInt(maxPrice));
  if (mode) results = results.filter(t => t.modes.includes(mode.toLowerCase()));
  if (language) {
    results = results.filter(t =>
      t.languages.some(l => l.toLowerCase().includes(language.toLowerCase()))
    );
  }

  if (sort === 'price_asc') results.sort((a, b) => a.price - b.price);
  else if (sort === 'price_desc') results.sort((a, b) => b.price - a.price);
  else if (sort === 'rating') results.sort((a, b) => b.rating - a.rating);

  res.json({ success: true, count: results.length, data: results });
});

// ─── GET single therapist ───
app.get('/api/therapists/:id', (req, res) => {
  const therapist = therapists.find(t => t.id === parseInt(req.params.id));
  if (!therapist) return res.status(404).json({ success: false, message: 'Therapist not found' });
  res.json({ success: true, data: therapist });
});

// ─── GET therapist availability ───
app.get('/api/therapists/:id/availability', (req, res) => {
  const therapist = therapists.find(t => t.id === parseInt(req.params.id));
  if (!therapist) return res.status(404).json({ success: false, message: 'Not found' });

  // Generate mock availability for next 30 days
  const slots = [];
  const today = new Date();
  for (let i = 1; i <= 30; i++) {
    const date = new Date(today);
    date.setDate(today.getDate() + i);
    if (date.getDay() !== 0) { // Not Sunday
      const times = [];
      if (Math.random() > 0.3) times.push('10:00 AM');
      if (Math.random() > 0.3) times.push('11:30 AM');
      if (Math.random() > 0.4) times.push('2:00 PM');
      if (Math.random() > 0.4) times.push('4:00 PM');
      if (Math.random() > 0.5) times.push('6:30 PM');
      if (times.length) slots.push({ date: date.toISOString().split('T')[0], times });
    }
  }
  res.json({ success: true, therapistId: req.params.id, slots });
});

// ─── POST create booking ───
app.post('/api/bookings', (req, res) => {
  const { therapist, slot, day, month, sessionType, name, email, notes } = req.body;

  if (!therapist || !slot) {
    return res.status(400).json({ success: false, message: 'therapist and slot are required' });
  }

  const booking = {
    id: `BK${Date.now()}`,
    therapist,
    slot,
    day: day || null,
    month: month || null,
    sessionType: sessionType || 'video',
    userName: name || 'Anonymous',
    userEmail: email || '',
    notes: notes || '',
    status: 'confirmed',
    createdAt: new Date().toISOString()
  };

  bookings.push(booking);
  console.log(`[BOOKING] ${booking.id} — ${therapist} on ${month} ${day} at ${slot}`);

  res.status(201).json({
    success: true,
    message: 'Booking confirmed!',
    data: booking
  });
});

// ─── GET all bookings ───
app.get('/api/bookings', (req, res) => {
  res.json({ success: true, count: bookings.length, data: bookings });
});

// ─── GET single booking ───
app.get('/api/bookings/:id', (req, res) => {
  const booking = bookings.find(b => b.id === req.params.id);
  if (!booking) return res.status(404).json({ success: false, message: 'Booking not found' });
  res.json({ success: true, data: booking });
});

// ─── DELETE booking ───
app.delete('/api/bookings/:id', (req, res) => {
  const idx = bookings.findIndex(b => b.id === req.params.id);
  if (idx === -1) return res.status(404).json({ success: false, message: 'Booking not found' });
  bookings.splice(idx, 1);
  res.json({ success: true, message: 'Booking cancelled' });
});

// ─── POST onboarding quiz → match ───
app.post('/api/quiz/match', (req, res) => {
  const { concern, budget, mode, language } = req.body;

  let matches = [...therapists];

  if (concern) {
    matches = matches.filter(t =>
      t.specializations.some(s => s.toLowerCase().includes(concern.toLowerCase()))
    );
  }
  if (budget) {
    matches = matches.filter(t => t.price <= parseInt(budget));
  }
  if (mode) {
    matches = matches.filter(t => t.modes.includes(mode));
  }
  if (language) {
    matches = matches.filter(t =>
      t.languages.some(l => l.toLowerCase().includes(language.toLowerCase()))
    );
  }

  // Sort by rating
  matches.sort((a, b) => b.rating - a.rating);

  res.json({
    success: true,
    matchCount: matches.length,
    message: matches.length ? `${matches.length} therapists matched!` : 'No exact match — showing all therapists.',
    data: matches.length ? matches.slice(0, 3) : therapists.slice(0, 3)
  });
});

// ─── Catch-all → serve frontend ───
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'index.html'));
});

// ─── START ───
app.listen(PORT, () => {
  console.log(`\n🧠 TherapistMatch API running at http://localhost:${PORT}`);
  console.log(`📋 Endpoints:`);
  console.log(`   GET  /api/health`);
  console.log(`   GET  /api/therapists`);
  console.log(`   GET  /api/therapists/:id`);
  console.log(`   GET  /api/therapists/:id/availability`);
  console.log(`   POST /api/bookings`);
  console.log(`   GET  /api/bookings`);
  console.log(`   DELETE /api/bookings/:id`);
  console.log(`   POST /api/quiz/match\n`);
});