const { Feedback, Message, User, sequelize } = require('../models');
const { Op } = require('sequelize');
const logger = require('../utils/logger');

const submitFeedback = async (req, res) => {
  try {
    const { messageId, feedbackType, rating, comment, correctedContent } = req.body;
    const userId = req.user.userId;

    // Validate feedback type
    const validTypes = ['positive', 'negative', 'correction', 'suggestion'];
    if (!validTypes.includes(feedbackType)) {
      return res.status(400).json({
        success: false,
        error: 'Invalid feedback type'
      });
    }

    // Validate rating if provided
    if (rating && (rating < 1 || rating > 5)) {
      return res.status(400).json({
        success: false,
        error: 'Rating must be between 1 and 5'
      });
    }

    // Verify message exists if messageId provided
    if (messageId) {
      const message = await Message.findByPk(messageId);
      if (!message) {
        return res.status(404).json({
          success: false,
          error: 'Message not found'
        });
      }
    }

    const feedback = await Feedback.create({
      user_id: userId,
      message_id: messageId,
      feedback_type: feedbackType,
      rating,
      comment,
      corrected_content: correctedContent,
      is_processed: false
    });

    logger.info(`Feedback submitted: ${feedback.id} by user ${userId}`);

    res.status(201).json({
      success: true,
      data: { feedback }
    });
  } catch (error) {
    logger.error('Submit feedback error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const getFeedback = async (req, res) => {
  try {
    const { feedbackId } = req.params;

    const feedback = await Feedback.findByPk(feedbackId, {
      include: [
        {
          model: User,
          attributes: ['id', 'email', 'first_name', 'last_name']
        },
        {
          model: Message,
          attributes: ['id', 'content', 'role']
        }
      ]
    });

    if (!feedback) {
      return res.status(404).json({
        success: false,
        error: 'Feedback not found'
      });
    }

    res.json({
      success: true,
      data: { feedback }
    });
  } catch (error) {
    logger.error('Get feedback error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const getFeedbackList = async (req, res) => {
  try {
    const { page = 1, limit = 10, feedbackType, isProcessed, userId } = req.query;

    const whereClause = {};
    if (feedbackType) whereClause.feedback_type = feedbackType;
    if (isProcessed !== undefined) whereClause.is_processed = isProcessed === 'true';
    if (userId) whereClause.user_id = userId;

    const feedback = await Feedback.findAndCountAll({
      where: whereClause,
      include: [
        {
          model: User,
          attributes: ['id', 'email', 'first_name', 'last_name']
        },
        {
          model: Message,
          attributes: ['id', 'content', 'role']
        }
      ],
      order: [['created_at', 'DESC']],
      limit: parseInt(limit),
      offset: (parseInt(page) - 1) * parseInt(limit)
    });

    res.json({
      success: true,
      data: {
        feedback: feedback.rows,
        pagination: {
          page: parseInt(page),
          limit: parseInt(limit),
          total: feedback.count,
          pages: Math.ceil(feedback.count / parseInt(limit))
        }
      }
    });
  } catch (error) {
    logger.error('Get feedback list error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const processFeedback = async (req, res) => {
  try {
    const { feedbackId } = req.params;
    const { processingNotes } = req.body;

    const feedback = await Feedback.findByPk(feedbackId);

    if (!feedback) {
      return res.status(404).json({
        success: false,
        error: 'Feedback not found'
      });
    }

    await feedback.update({
      is_processed: true,
      processing_notes: processingNotes
    });

    logger.info(`Feedback processed: ${feedbackId}`);

    res.json({
      success: true,
      data: { feedback }
    });
  } catch (error) {
    logger.error('Process feedback error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const getFeedbackStats = async (req, res) => {
  try {
    const stats = await Feedback.findAll({
      attributes: [
        'feedback_type',
        [sequelize.fn('COUNT', sequelize.col('id')), 'count'],
        [sequelize.fn('AVG', sequelize.col('rating')), 'avg_rating']
      ],
      group: ['feedback_type'],
      raw: true
    });

    const totalFeedback = await Feedback.count();
    const processedFeedback = await Feedback.count({ where: { is_processed: true } });

    res.json({
      success: true,
      data: {
        stats,
        total: totalFeedback,
        processed: processedFeedback,
        unprocessed: totalFeedback - processedFeedback
      }
    });
  } catch (error) {
    logger.error('Get feedback stats error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

module.exports = {
  submitFeedback,
  getFeedback,
  getFeedbackList,
  processFeedback,
  getFeedbackStats
};