# All files / controllers PipelineStagesController.js

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     /**
     * Pipeline Stages Controller
     * Manages pipeline stages for tenant (admin can create/edit/delete)
     * Users can only move conversations between stages
     */

    const BaseController = require('./BaseController');
    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');

    class PipelineStagesController extends BaseController {
      /**
       * Get all pipeline stages for tenant
       * GET /api/admin/pipeline-stages
       */
      static async getStages(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          const [stages] = await pool.execute(`
            SELECT id, stage_key, stage_name, stage_color, stage_icon, stage_order, is_default, active
            FROM pipeline_stages
            WHERE tenant_id = ?
            ORDER BY stage_order ASC
          `, [tenantId]);

          return res.json({
            success: true,
            data: stages
          });
        } catch (error) {
          logger.error('Error getting pipeline stages', {
            error: error.message,
            stack: error.stack
          });

          return res.status(500).json({
            success: false,
            message: 'Failed to load pipeline stages'
          });
        }
      }

      /**
       * Create new pipeline stage
       * POST /api/admin/pipeline-stages
       */
      static async createStage(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { stage_key, stage_name, stage_color, stage_icon, stage_order } = req.body;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          if (!stage_key || !stage_name) {
            return res.status(400).json({
              success: false,
              message: 'Stage key and name are required'
            });
          }

          // Check if stage key already exists
          const [existing] = await pool.execute(`
            SELECT id FROM pipeline_stages
            WHERE tenant_id = ? AND stage_key = ?
          `, [tenantId, stage_key]);

          if (existing.length > 0) {
            return res.status(400).json({
              success: false,
              message: 'Stage key already exists'
            });
          }

          // Get next order if not provided
          let order = stage_order;
          if (!order) {
            const [maxOrder] = await pool.execute(`
              SELECT COALESCE(MAX(stage_order), 0) + 1 as next_order
              FROM pipeline_stages
              WHERE tenant_id = ?
            `, [tenantId]);
            order = maxOrder[0].next_order;
          }

          // Insert new stage
          const [result] = await pool.execute(`
            INSERT INTO pipeline_stages (tenant_id, stage_key, stage_name, stage_color, stage_icon, stage_order)
            VALUES (?, ?, ?, ?, ?, ?)
          `, [tenantId, stage_key, stage_name, stage_color || '#6b7280', stage_icon || 'fas fa-circle', order]);

          // Get the created stage
          const [newStage] = await pool.execute(`
            SELECT id, stage_key, stage_name, stage_color, stage_icon, stage_order, is_default, active
            FROM pipeline_stages
            WHERE id = ?
          `, [result.insertId]);

          // Emit to all users in tenant
          const io = req.app.get('io');
          if (io) {
            io.to(`TENANT:${tenantId}`).emit('pipeline-stage-created', {
              stage: newStage[0]
            });
          }

          return res.json({
            success: true,
            data: newStage[0],
            message: 'Pipeline stage created successfully'
          });
        } catch (error) {
          logger.error('Error creating pipeline stage', {
            error: error.message,
            stack: error.stack
          });

          return res.status(500).json({
            success: false,
            message: 'Failed to create pipeline stage'
          });
        }
      }

      /**
       * Update pipeline stage
       * PUT /api/admin/pipeline-stages/:id
       */
      static async updateStage(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const stageId = req.params.id;
          const { stage_name, stage_color, stage_icon, stage_order } = req.body;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          // Check if stage exists and belongs to tenant
          const [existing] = await pool.execute(`
            SELECT id, is_default FROM pipeline_stages
            WHERE id = ? AND tenant_id = ?
          `, [stageId, tenantId]);

          if (existing.length === 0) {
            return res.status(404).json({
              success: false,
              message: 'Pipeline stage not found'
            });
          }

          // Build update query
          const updates = [];
          const values = [];

          if (stage_name) {
            updates.push('stage_name = ?');
            values.push(stage_name);
          }
          if (stage_color) {
            updates.push('stage_color = ?');
            values.push(stage_color);
          }
          if (stage_icon) {
            updates.push('stage_icon = ?');
            values.push(stage_icon);
          }
          if (stage_order !== undefined) {
            updates.push('stage_order = ?');
            values.push(stage_order);
          }

          if (updates.length === 0) {
            return res.status(400).json({
              success: false,
              message: 'No fields to update'
            });
          }

          values.push(stageId, tenantId);

          await pool.execute(`
            UPDATE pipeline_stages
            SET ${updates.join(', ')}, updated_at = NOW()
            WHERE id = ? AND tenant_id = ?
          `, values);

          // Get updated stage
          const [updatedStage] = await pool.execute(`
            SELECT id, stage_key, stage_name, stage_color, stage_icon, stage_order, is_default, active
            FROM pipeline_stages
            WHERE id = ?
          `, [stageId]);

          // Emit to all users in tenant
          const io = req.app.get('io');
          if (io) {
            io.to(`TENANT:${tenantId}`).emit('pipeline-stage-updated', {
              stage: updatedStage[0]
            });
          }

          return res.json({
            success: true,
            data: updatedStage[0],
            message: 'Pipeline stage updated successfully'
          });
        } catch (error) {
          logger.error('Error updating pipeline stage', {
            error: error.message,
            stack: error.stack
          });

          return res.status(500).json({
            success: false,
            message: 'Failed to update pipeline stage'
          });
        }
      }

      /**
       * Delete pipeline stage
       * DELETE /api/admin/pipeline-stages/:id
       */
      static async deleteStage(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const stageId = req.params.id;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          // Check if stage exists and belongs to tenant
          const [existing] = await pool.execute(`
            SELECT id, stage_key, is_default FROM pipeline_stages
            WHERE id = ? AND tenant_id = ?
          `, [stageId, tenantId]);

          if (existing.length === 0) {
            return res.status(404).json({
              success: false,
              message: 'Pipeline stage not found'
            });
          }

          // Don't allow deleting default stages
          if (existing[0].is_default) {
            return res.status(400).json({
              success: false,
              message: 'Cannot delete default pipeline stage'
            });
          }

          // Check if stage has conversations
          const [conversations] = await pool.execute(`
            SELECT COUNT(*) as count FROM whatsapp_cloud_conversations
            WHERE tenant_id = ? AND stage_id = ?
          `, [tenantId, existing[0].stage_key]);

          if (conversations[0].count > 0) {
            // Move conversations to 'unassigned' before deleting the stage
            await pool.execute(`
              UPDATE whatsapp_cloud_conversations
              SET stage_id = 'unassigned', updated_at = NOW()
              WHERE tenant_id = ? AND stage_id = ?
            `, [tenantId, existing[0].stage_key]);
          }

          // Delete stage
          await pool.execute(`
            DELETE FROM pipeline_stages
            WHERE id = ? AND tenant_id = ?
          `, [stageId, tenantId]);

          // Emit to all users in tenant
          const io = req.app.get('io');
          if (io) {
            io.to(`TENANT:${tenantId}`).emit('pipeline-stage-deleted', {
              stageId: parseInt(stageId),
              stageKey: existing[0].stage_key
            });
          }

          return res.json({
            success: true,
            message: 'Pipeline stage deleted successfully'
          });
        } catch (error) {
          logger.error('Error deleting pipeline stage', {
            error: error.message,
            stack: error.stack
          });

          return res.status(500).json({
            success: false,
            message: 'Failed to delete pipeline stage'
          });
        }
      }

      /**
       * Reorder pipeline stages
       * PUT /api/admin/pipeline-stages/reorder
       */
      static async reorderStages(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { stages } = req.body; // Array of {id, order}

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          if (!Array.isArray(stages)) {
            return res.status(400).json({
              success: false,
              message: 'Stages array is required'
            });
          }

          // Update order for each stage
          for (const stage of stages) {
            await pool.execute(`
              UPDATE pipeline_stages
              SET stage_order = ?, updated_at = NOW()
              WHERE id = ? AND tenant_id = ?
            `, [stage.order, stage.id, tenantId]);
          }

          // Get updated stages
          const [updatedStages] = await pool.execute(`
            SELECT id, stage_key, stage_name, stage_color, stage_icon, stage_order, is_default, active
            FROM pipeline_stages
            WHERE tenant_id = ?
            ORDER BY stage_order ASC
          `, [tenantId]);

          // Emit to all users in tenant
          const io = req.app.get('io');
          if (io) {
            io.to(`TENANT:${tenantId}`).emit('pipeline-stages-reordered', {
              stages: updatedStages
            });
          }

          return res.json({
            success: true,
            data: updatedStages,
            message: 'Pipeline stages reordered successfully'
          });
        } catch (error) {
          logger.error('Error reordering pipeline stages', {
            error: error.message,
            stack: error.stack
          });

          return res.status(500).json({
            success: false,
            message: 'Failed to reorder pipeline stages'
          });
        }
      }
    }

    module.exports = PipelineStagesController;