const express = require('express');
const { User } = require('../models');
const taskSummaryService = require('../services/taskSummaryService');
const router = express.Router();

const VALID_FREQUENCIES = ['daily', 'weekdays', 'weekly', '1h', '2h', '4h', '8h', '12h'];

// GET /api/profile
router.get('/profile', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId, {
      attributes: [
        'id', 'email', 'appearance', 'language', 'timezone', 
        'avatar_image', 'telegram_bot_token', 'telegram_chat_id',
        'task_summary_enabled', 'task_summary_frequency', 'task_intelligence_enabled',
        'auto_suggest_next_actions_enabled', 'pomodoro_enabled', 'today_settings'
      ]
    });

    if (!user) {
      return res.status(404).json({ error: 'Profile not found.' });
    }

    // Parse today_settings if it's a string
    if (user.today_settings && typeof user.today_settings === 'string') {
      try {
        user.today_settings = JSON.parse(user.today_settings);
      } catch (error) {
        console.error('Error parsing today_settings:', error);
        user.today_settings = null;
      }
    }

    res.json(user);
  } catch (error) {
    console.error('Error fetching profile:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

// PATCH /api/profile
router.patch('/profile', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'Profile not found.' });
    }

    const { appearance, language, timezone, avatar_image, telegram_bot_token, task_intelligence_enabled, task_summary_enabled, task_summary_frequency, auto_suggest_next_actions_enabled, pomodoro_enabled, currentPassword, newPassword } = req.body;
    
    const allowedUpdates = {};
    if (appearance !== undefined) allowedUpdates.appearance = appearance;
    if (language !== undefined) allowedUpdates.language = language;
    if (timezone !== undefined) allowedUpdates.timezone = timezone;
    if (avatar_image !== undefined) allowedUpdates.avatar_image = avatar_image;
    if (telegram_bot_token !== undefined) allowedUpdates.telegram_bot_token = telegram_bot_token;
    if (task_intelligence_enabled !== undefined) allowedUpdates.task_intelligence_enabled = task_intelligence_enabled;
    if (task_summary_enabled !== undefined) allowedUpdates.task_summary_enabled = task_summary_enabled;
    if (task_summary_frequency !== undefined) allowedUpdates.task_summary_frequency = task_summary_frequency;
    if (auto_suggest_next_actions_enabled !== undefined) allowedUpdates.auto_suggest_next_actions_enabled = auto_suggest_next_actions_enabled;
    if (pomodoro_enabled !== undefined) allowedUpdates.pomodoro_enabled = pomodoro_enabled;

    // Handle password change if provided
    if (currentPassword && newPassword) {
      if (newPassword.length < 6) {
        return res.status(400).json({ 
          field: 'newPassword', 
          error: 'Password must be at least 6 characters' 
        });
      }

      // Verify current password
      const isValidPassword = await User.checkPassword(currentPassword, user.password_digest);
      if (!isValidPassword) {
        return res.status(400).json({ 
          field: 'currentPassword', 
          error: 'Current password is incorrect' 
        });
      }

      // Hash and include new password in updates
      const hashedNewPassword = await User.hashPassword(newPassword);
      allowedUpdates.password_digest = hashedNewPassword;
    }

    await user.update(allowedUpdates);

    // Return updated user with limited fields
    const updatedUser = await User.findByPk(user.id, {
      attributes: ['id', 'email', 'appearance', 'language', 'timezone', 'avatar_image', 'telegram_bot_token', 'telegram_chat_id', 'task_intelligence_enabled', 'task_summary_enabled', 'task_summary_frequency', 'auto_suggest_next_actions_enabled', 'pomodoro_enabled']
    });

    res.json(updatedUser);
  } catch (error) {
    console.error('Error updating profile:', error);
    res.status(400).json({ 
      error: 'Failed to update profile.', 
      details: error.errors ? error.errors.map(e => e.message) : [error.message]
    });
  }
});

// POST /api/profile/change-password
router.post('/profile/change-password', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const { currentPassword, newPassword } = req.body;
    
    if (!currentPassword || !newPassword) {
      return res.status(400).json({ error: 'Current password and new password are required' });
    }

    if (newPassword.length < 6) {
      return res.status(400).json({ 
        field: 'newPassword', 
        error: 'Password must be at least 6 characters' 
      });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found' });
    }

    // Verify current password
    const isValidPassword = await User.checkPassword(currentPassword, user.password_digest);
    if (!isValidPassword) {
      return res.status(400).json({ 
        field: 'currentPassword', 
        error: 'Current password is incorrect' 
      });
    }

    // Hash and update new password
    const hashedNewPassword = await User.hashPassword(newPassword);
    await user.update({ password_digest: hashedNewPassword });

    res.json({ message: 'Password changed successfully' });
  } catch (error) {
    console.error('Error changing password:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

// POST /api/profile/task-summary/toggle
router.post('/profile/task-summary/toggle', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found.' });
    }

    const enabled = !user.task_summary_enabled;
    
    await user.update({ task_summary_enabled: enabled });

    // Note: Telegram integration would need to be implemented separately
    const message = enabled 
      ? 'Task summary notifications have been enabled.' 
      : 'Task summary notifications have been disabled.';

    res.json({
      success: true,
      enabled: enabled,
      message: message
    });
  } catch (error) {
    console.error('Error toggling task summary:', error);
    res.status(400).json({ 
      error: 'Failed to update task summary settings.',
      details: error.errors ? error.errors.map(e => e.message) : [error.message]
    });
  }
});

// POST /api/profile/task-summary/frequency
router.post('/profile/task-summary/frequency', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const { frequency } = req.body;
    
    if (!frequency) {
      return res.status(400).json({ error: 'Frequency is required.' });
    }

    if (!VALID_FREQUENCIES.includes(frequency)) {
      return res.status(400).json({ error: 'Invalid frequency value.' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found.' });
    }

    await user.update({ task_summary_frequency: frequency });

    res.json({
      success: true,
      frequency: frequency,
      message: `Task summary frequency has been set to ${frequency}.`
    });
  } catch (error) {
    console.error('Error updating task summary frequency:', error);
    res.status(400).json({ 
      error: 'Failed to update task summary frequency.',
      details: error.errors ? error.errors.map(e => e.message) : [error.message]
    });
  }
});

// POST /api/profile/task-summary/send-now
router.post('/profile/task-summary/send-now', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found.' });
    }

    if (!user.telegram_bot_token || !user.telegram_chat_id) {
      return res.status(400).json({ error: 'Telegram bot is not properly configured.' });
    }

    // Send the task summary
    const success = await taskSummaryService.sendSummaryToUser(user.id);
    
    if (success) {
      res.json({
        success: true,
        message: 'Task summary was sent to your Telegram.'
      });
    } else {
      res.status(400).json({ error: 'Failed to send message to Telegram.' });
    }
  } catch (error) {
    console.error('Error sending task summary:', error);
    res.status(400).json({ 
      error: 'Error sending message to Telegram.',
      details: error.message
    });
  }
});

// GET /api/profile/task-summary/status
router.get('/profile/task-summary/status', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found.' });
    }

    res.json({
      success: true,
      enabled: user.task_summary_enabled,
      frequency: user.task_summary_frequency,
      last_run: user.task_summary_last_run,
      next_run: user.task_summary_next_run
    });
  } catch (error) {
    console.error('Error fetching task summary status:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

// PUT /api/profile/today-settings
router.put('/profile/today-settings', async (req, res) => {
  try {
    if (!req.session || !req.session.userId) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const user = await User.findByPk(req.session.userId);
    if (!user) {
      return res.status(404).json({ error: 'User not found.' });
    }

    const {
      showMetrics,
      showProductivity,
      showIntelligence,
      showDueToday,
      showCompleted,
      showProgressBar,
      showDailyQuote
    } = req.body;

    const todaySettings = {
      showMetrics: showMetrics !== undefined ? showMetrics : user.today_settings?.showMetrics || false,
      showProductivity: showProductivity !== undefined ? showProductivity : user.today_settings?.showProductivity || false,
      showIntelligence: showIntelligence !== undefined ? showIntelligence : user.today_settings?.showIntelligence || false,
      showDueToday: showDueToday !== undefined ? showDueToday : user.today_settings?.showDueToday || true,
      showCompleted: showCompleted !== undefined ? showCompleted : user.today_settings?.showCompleted || true,
      showProgressBar: true, // Always enabled - ignore any attempts to disable it
      showDailyQuote: showDailyQuote !== undefined ? showDailyQuote : user.today_settings?.showDailyQuote || true
    };

    await user.update({ today_settings: todaySettings });

    res.json({
      success: true,
      today_settings: todaySettings
    });
  } catch (error) {
    console.error('Error updating today settings:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

module.exports = router;