/**
 * Classify Step — keyword-based classification using classification_rules table.
 * Config: {
 *   rule_type: 'branch_routing' | 'ticket_type' | 'issue_classification' | 'priority' | 'queue_routing',
 *   result_field: 'branch' | 'ticket_type' | 'issue_type' | 'priority' | 'queue_id',
 *   result_field_2?: 'sub_issue_type',  // for issue_classification only
 *   default_value?: any  // fallback if no rules match
 * }
 */

import { registerWorkflowStepExecutor } from '../ticket-workflow-engine';
import { roboticClassifier } from '../robotic-classifier';
import { TicketWorkflowStep, WorkflowStepContext, WorkflowStepResult } from '../../types/ticket-workflow';

async function executeClassify(
  step: TicketWorkflowStep,
  context: WorkflowStepContext,
  _executionId: number
): Promise<WorkflowStepResult> {
  const ruleType = step.config.rule_type;
  const resultField = step.config.result_field;
  const resultField2 = step.config.result_field_2;
  const defaultValue = step.config.default_value;

  if (!ruleType || !resultField) {
    return {
      success: false,
      error: 'Missing required config: rule_type and result_field'
    };
  }

  // Ensure rules are loaded
  await roboticClassifier.loadRules();

  // Build ticket context (may have values from previous steps)
  const ticket = {
    ...context.ticket,
    ...(context.field_changes || {})
  };

  // Run classification for this rule type
  const result = await (roboticClassifier as any).classifyByType(ruleType, ticket);

  if (!result && defaultValue !== undefined) {
    // No match, use default
    const output: any = {
      [resultField]: defaultValue,
      matched_rule: null,
      confidence: 'default',
      method: 'default'
    };

    // Track field change
    if (!context.field_changes) {
      context.field_changes = {};
    }
    context.field_changes[resultField] = {
      before: (ticket as any)[resultField] || null,
      after: defaultValue
    };

    return { success: true, output };
  }

  if (!result) {
    // No match and no default
    return {
      success: true,
      output: {
        [resultField]: null,
        matched_rule: null,
        confidence: 'none',
        method: 'no_match'
      }
    };
  }

  // Matched a rule
  const output: any = {
    [resultField]: result.value,
    matched_rule: result.matched_rule_name,
    confidence: result.confidence,
    method: 'robotic'
  };

  // Track field change for primary result
  if (!context.field_changes) {
    context.field_changes = {};
  }
  context.field_changes[resultField] = {
    before: (ticket as any)[resultField] || null,
    after: result.value
  };

  // Handle secondary result (e.g., sub_issue_type)
  if (resultField2 && result.value_2 !== undefined) {
    output[resultField2] = result.value_2;
    context.field_changes[resultField2] = {
      before: (ticket as any)[resultField2] || null,
      after: result.value_2
    };
  }

  // Store full classification result in context for later steps
  if (!context.classification) {
    context.classification = {};
  }
  context.classification[ruleType] = result;

  return { success: true, output };
}

registerWorkflowStepExecutor('classify', executeClassify);