const queryModelService = require('../services/queryModelService');
const { Plan, ToolExecution, Conversation, Message } = require('../models');
const logger = require('../utils/logger');

const executePlan = async (req, res) => {
  try {
    const { planId, options = {} } = req.body;
    const userId = req.user.userId;

    if (!planId) {
      return res.status(400).json({
        success: false,
        error: 'Plan ID is required'
      });
    }

    // Verify plan belongs to user
    const plan = await Plan.findOne({
      where: {
        id: planId
      },
      include: [
        {
          model: Conversation,
          where: {
            user_id: userId
          },
          attributes: ['id', 'title', 'user_id']
        }
      ]
    });

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

    if (plan.status !== 'approved') {
      return res.status(400).json({
        success: false,
        error: 'Plan must be approved before execution'
      });
    }

    // Execute plan using QUERYMODEL
    const result = await queryModelService.executePlan(planId, options);

    logger.info(`QUERYMODEL execution completed for plan: ${planId}`);

    res.json({
      success: true,
      data: result
    });
  } catch (error) {
    logger.error('QUERYMODEL execution error:', error);
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
};

const executeTool = async (req, res) => {
  try {
    const { planId, toolName, toolType, inputParameters } = req.body;
    const userId = req.user.userId;

    if (!planId || !toolName || !toolType || !inputParameters) {
      return res.status(400).json({
        success: false,
        error: 'Plan ID, tool name, type, and input parameters are required'
      });
    }

    // Verify plan belongs to user
    const plan = await Plan.findOne({
      where: {
        id: planId
      },
      include: [
        {
          model: Conversation,
          where: {
            user_id: userId
          },
          attributes: ['id', 'title', 'user_id']
        }
      ]
    });

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

    // Execute tool using QUERYMODEL
    const result = await queryModelService.executeTool(toolName, toolType, inputParameters, planId);

    logger.info(`Tool executed: ${toolName} for plan: ${planId}`);

    res.json({
      success: true,
      data: { toolExecution: result }
    });
  } catch (error) {
    logger.error('Execute tool error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const orchestratePlan = async (req, res) => {
  try {
    const { planId, options = {} } = req.body;
    const userId = req.user.userId;

    if (!planId) {
      return res.status(400).json({
        success: false,
        error: 'Plan ID is required'
      });
    }

    // Verify plan belongs to user
    const plan = await Plan.findOne({
      where: {
        id: planId
      },
      include: [
        {
          model: Conversation,
          where: {
            user_id: userId
          },
          attributes: ['id', 'title', 'user_id']
        }
      ]
    });

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

    if (plan.status !== 'approved') {
      return res.status(400).json({
        success: false,
        error: 'Plan must be approved before orchestration'
      });
    }

    // Get the original user query from the conversation
    const originalMessage = await Message.findOne({
      where: { 
        conversation_id: plan.conversation_id,
        role: 'user'
      },
      order: [['created_at', 'DESC']]
    });
    
    const originalQuery = originalMessage ? originalMessage.content : plan.title;

    // Execute orchestration using QUERYMODEL
    const result = await queryModelService.executeOrchestrate({
      query: originalQuery,
      category: 'engineering',
      topK: options.topK || 5,
      generateReport: true
    });

    logger.info(`QUERYMODEL orchestration completed for plan: ${planId}`);

    res.json({
      success: true,
      data: { toolExecution: result }
    });
  } catch (error) {
    logger.error('QUERYMODEL orchestration error:', error);
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
};

const getExecutionStatus = async (req, res) => {
  try {
    const { planId } = req.params;
    const userId = req.user.userId;

    const plan = await Plan.findOne({
      where: {
        id: planId
      },
      include: [
        {
          model: Conversation,
          where: {
            user_id: userId
          },
          attributes: ['id', 'title', 'user_id']
        }
      ]
    });

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

    // Get tool executions for this plan
    const toolExecutions = await ToolExecution.findAll({
      where: {
        plan_id: planId
      },
      order: [['created_at', 'DESC']]
    });

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

const getToolExecutions = async (req, res) => {
  try {
    const { planId, toolType, status, page = 1, limit = 10 } = req.query;
    const userId = req.user.userId;

    const whereClause = {};
    if (planId) whereClause.plan_id = planId;
    if (toolType) whereClause.tool_type = toolType;
    if (status) whereClause.status = status;

    // Verify plan belongs to user if planId provided
    if (planId) {
      const plan = await Plan.findOne({
        where: {
          id: planId
        },
        include: [
          {
            model: Conversation,
            where: {
              user_id: userId
            },
            attributes: ['id', 'title', 'user_id']
          }
        ]
      });

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

    const offset = (page - 1) * limit;

    const { count, rows: executions } = await ToolExecution.findAndCountAll({
      where: whereClause,
      include: [
        {
          model: Plan,
          where: {
            conversation: {
              user_id: userId
            }
          },
          include: [
            {
              model: Conversation,
              attributes: ['id', 'title', 'user_id']
            }
          ]
        }
      ],
      order: [['created_at', 'DESC']],
      limit: parseInt(limit),
      offset: parseInt(offset)
    });

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

const getModelStatus = async (req, res) => {
  try {
    const status = await queryModelService.getModelStatus();

    res.json({
      success: true,
      data: status
    });
  } catch (error) {
    logger.error('QUERYMODEL status error:', error);
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
};

module.exports = {
  executePlan,
  executeTool,
  orchestratePlan,
  getExecutionStatus,
  getToolExecutions,
  getModelStatus
};