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

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

    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 exists
    const plan = await Plan.findByPk(planId);
    if (!plan) {
      return res.status(404).json({
        success: false,
        error: 'Plan not found'
      });
    }

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

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

    res.json({
      success: true,
      data: { toolExecution }
    });
  } catch (error) {
    logger.error('Execute tool 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 whereClause = {};
    if (planId) whereClause.plan_id = planId;
    if (toolType) whereClause.tool_type = toolType;
    if (status) whereClause.status = status;

    const toolExecutions = await ToolExecution.findAndCountAll({
      where: whereClause,
      include: [
        {
          model: Plan,
          attributes: ['id', 'title', 'status']
        },
        {
          model: Document,
          attributes: ['id', 'filename', 'original_filename']
        }
      ],
      order: [['created_at', 'DESC']],
      limit: parseInt(limit),
      offset: (parseInt(page) - 1) * parseInt(limit)
    });

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

const getToolExecution = async (req, res) => {
  try {
    const { executionId } = req.params;

    const toolExecution = await ToolExecution.findByPk(executionId, {
      include: [
        {
          model: Plan,
          attributes: ['id', 'title', 'status']
        },
        {
          model: Document,
          attributes: ['id', 'filename', 'original_filename']
        }
      ]
    });

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

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

const getToolStats = async (req, res) => {
  try {
    const stats = await ToolExecution.findAll({
      attributes: [
        'tool_name',
        'tool_type',
        [sequelize.fn('COUNT', sequelize.col('id')), 'count'],
        [sequelize.fn('AVG', sequelize.col('execution_time')), 'avg_execution_time'],
        [sequelize.fn('SUM', sequelize.col('tokens_used')), 'total_tokens']
      ],
      group: ['tool_name', 'tool_type'],
      raw: true
    });

    const totalExecutions = await ToolExecution.count();
    const successfulExecutions = await ToolExecution.count({ where: { status: 'completed' } });
    const failedExecutions = await ToolExecution.count({ where: { status: 'failed' } });

    res.json({
      success: true,
      data: {
        stats,
        summary: {
          total: totalExecutions,
          successful: successfulExecutions,
          failed: failedExecutions,
          successRate: totalExecutions > 0 ? (successfulExecutions / totalExecutions) * 100 : 0
        }
      }
    });
  } catch (error) {
    logger.error('Get tool stats error:', error);
    res.status(500).json({
      success: false,
      error: 'Internal server error'
    });
  }
};

const retryToolExecution = async (req, res) => {
  try {
    const { executionId } = req.params;

    const toolExecution = await ToolExecution.findByPk(executionId);

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

    if (toolExecution.status === 'running') {
      return res.status(400).json({
        success: false,
        error: 'Tool execution is already running'
      });
    }

    // Reset execution status
    await toolExecution.update({
      status: 'pending',
      output_result: null,
      execution_time: null,
      error_message: null
    });

    // Retry tool execution using QUERYMODEL service
    try {
      const retryExecution = await queryModelService.executeTool(
        toolExecution.tool_name,
        toolExecution.tool_type,
        toolExecution.input_parameters,
        toolExecution.plan_id
      );
      
      // Update the original execution record with retry results
      await toolExecution.update({
        output_result: retryExecution.output_result,
        status: retryExecution.status,
        execution_time: retryExecution.execution_time,
        tokens_used: retryExecution.tokens_used,
        error_message: null
      });
      
      logger.info(`Tool execution retried successfully: ${executionId}`);
    } catch (retryError) {
      logger.error(`Tool execution retry failed: ${executionId}`, retryError);
      
      await toolExecution.update({
        status: 'failed',
        error_message: retryError.message
      });
      
      throw retryError;
    }

    logger.info(`Tool execution retried: ${executionId}`);

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

module.exports = {
  executeTool,
  getToolExecutions,
  getToolExecution,
  getToolStats,
  retryToolExecution
};