const { Context } = require('../models');

/**
 * Context Controller
 */
class ContextController {
  /**
   * Get all contexts with pagination and filters
   */
  async getAllContexts(req, res, next) {
    try {
      const { page = 1, limit = 50, type, title } = req.query;
      const offset = (page - 1) * limit;

      const where = {};
      if (type) where.type = type;
      if (title) where.title = title;

      const { count, rows } = await Context.findAndCountAll({
        where,
        limit: parseInt(limit),
        offset: parseInt(offset),
        order: [['created_at', 'DESC']]
      });

      res.json({
        success: true,
        data: {
          contexts: rows,
          pagination: {
            total: count,
            page: parseInt(page),
            limit: parseInt(limit),
            totalPages: Math.ceil(count / limit)
          }
        }
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Get context by UUID
   */
  async getContextById(req, res, next) {
    try {
      const { id } = req.params;
      const context = await Context.findByPk(id);

      if (!context) {
        return res.status(404).json({
          success: false,
          message: 'Context not found'
        });
      }

      res.json({
        success: true,
        data: context
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Create new context
   */
  async createContext(req, res, next) {
    try {
      const context = await Context.create(req.body);

      res.status(201).json({
        success: true,
        message: 'Context created successfully',
        data: context
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Update context
   */
  async updateContext(req, res, next) {
    try {
      const { id } = req.params;
      const updates = req.body;

      const context = await Context.findByPk(id);
      if (!context) {
        return res.status(404).json({
          success: false,
          message: 'Context not found'
        });
      }

      await context.update(updates);

      res.json({
        success: true,
        message: 'Context updated successfully',
        data: context
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Delete context
   */
  async deleteContext(req, res, next) {
    try {
      const { id } = req.params;
      const context = await Context.findByPk(id);

      if (!context) {
        return res.status(404).json({
          success: false,
          message: 'Context not found'
        });
      }

      await context.destroy();

      res.json({
        success: true,
        message: 'Context deleted successfully'
      });
    } catch (error) {
      next(error);
    }
  }
}

module.exports = new ContextController();